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  Subjects -> ENGINEERING (Total: 2277 journals)
    - CHEMICAL ENGINEERING (191 journals)
    - CIVIL ENGINEERING (184 journals)
    - ELECTRICAL ENGINEERING (103 journals)
    - ENGINEERING (1203 journals)
    - ENGINEERING MECHANICS AND MATERIALS (381 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (69 journals)
    - MECHANICAL ENGINEERING (91 journals)

ENGINEERING (1203 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 401 - 600 of 1205 Journals sorted alphabetically
IET Optoelectronics     Hybrid Journal   (Followers: 1)
IET Radar, Sonar & Navigation     Hybrid Journal   (Followers: 28)
IET Renewable Power Generation     Hybrid Journal   (Followers: 10)
IET Science, Measurement & Technology     Hybrid Journal   (Followers: 2)
IET Signal Processing     Hybrid Journal   (Followers: 19)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 11)
IIE Transactions     Hybrid Journal   (Followers: 1)
IIUM Engineering Journal     Open Access  
Implementation Science     Open Access   (Followers: 15)
Indian Journal of Biotechnology (IJBT)     Open Access   (Followers: 2)
Indonesian Journal of Science and Technology     Open Access  
Industrial Data     Open Access   (Followers: 1)
Industrie et Technologies     Full-text available via subscription   (Followers: 17)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Ingeniare : Revista Chilena de Ingenieria     Open Access   (Followers: 1)
Ingenieria     Open Access   (Followers: 1)
Ingeniería     Open Access   (Followers: 1)
Ingenieria de Recursos Naturales y del Ambiente     Open Access  
Ingeniería Energética     Open Access  
Ingenieria Industrial. Actualidad y Nuevas Tendencias     Open Access  
Ingeniería Investigación y Desarrollo     Open Access   (Followers: 2)
Ingeniería solidaria     Open Access   (Followers: 1)
Ingenieria y Ciencia     Open Access   (Followers: 1)
Ingeniería y Desarrollo     Open Access  
Ingenieria y Universidad     Open Access   (Followers: 1)
Ingeniería, Investigación y Tecnología     Open Access   (Followers: 1)
Ingenio Magno     Open Access   (Followers: 1)
Ingenius : Revista de Ciencia y Tecnología     Open Access  
Innovare : Revista de ciencia y tecnología     Open Access  
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Integration, the VLSI Journal     Hybrid Journal   (Followers: 5)
Intelligent Control and Automation     Open Access   (Followers: 6)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Interface Science and Technology     Full-text available via subscription  
Intermetallics     Hybrid Journal   (Followers: 23)
International Archives of Science and Technology     Open Access  
International Communications in Heat and Mass Transfer     Hybrid Journal   (Followers: 20)
International conference KNOWLEDGE-BASED ORGANIZATION     Open Access  
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 5)
International Journal for Numerical Methods in Engineering     Hybrid Journal   (Followers: 29)
International Journal for Numerical Methods in Fluids     Hybrid Journal   (Followers: 19)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 4)
International Journal for the History of Engineering & Technology     Hybrid Journal   (Followers: 8)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Adaptive Control and Signal Processing     Hybrid Journal   (Followers: 2)
International Journal of Adhesion and Adhesives     Hybrid Journal   (Followers: 18)
International Journal of Advanced Engineering Research and Science IJAERS     Open Access   (Followers: 8)
International Journal of Advanced engineering, Management and Science     Open Access   (Followers: 1)
International Journal of Advancements in Technology     Open Access   (Followers: 1)
International Journal of Advances in Applied Sciences     Open Access   (Followers: 4)
International Journal of Advances in Engineering Sciences     Open Access   (Followers: 3)
International Journal of Advances in Engineering Sciences and Applied Mathematics     Hybrid Journal   (Followers: 1)
International Journal of Advances in Engineering, Science and Technology     Open Access   (Followers: 3)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 20)
International Journal of Air-Conditioning and Refrigeration     Hybrid Journal   (Followers: 9)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Ceramic Technology     Hybrid Journal   (Followers: 8)
International Journal of Applied Power Engineering     Open Access   (Followers: 5)
International Journal of Architectural Computing     Full-text available via subscription   (Followers: 5)
International Journal of Automation and Control Engineering     Open Access   (Followers: 4)
International Journal of Automotive Technology and Management     Hybrid Journal   (Followers: 6)
International Journal of Autonomic Computing     Hybrid Journal   (Followers: 1)
International Journal of Autonomous and Adaptive Communications Systems     Hybrid Journal   (Followers: 4)
International Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
International Journal of Bifurcation and Chaos     Hybrid Journal   (Followers: 2)
International Journal of Biomedical and Clinical Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Biomedical Imaging     Open Access   (Followers: 5)
International Journal of Cast Metals Research     Hybrid Journal  
International Journal of Circuit Theory and Applications     Hybrid Journal   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Collaborative Engineering     Hybrid Journal  
International Journal of Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Complexity in Applied Science and Technology     Hybrid Journal  
International Journal of Computer Aided Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Computer Applications in Technology     Hybrid Journal   (Followers: 3)
International Journal of Control Science and Engineering     Open Access   (Followers: 5)
International Journal of Control, Automation and Systems     Hybrid Journal   (Followers: 12)
International Journal of Corrosion     Open Access   (Followers: 11)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 9)
International Journal of Design Engineering     Hybrid Journal   (Followers: 14)
International Journal of Digital Multimedia Broadcasting     Open Access   (Followers: 5)
International Journal of Education and Management Engineering     Open Access   (Followers: 2)
International Journal of Education Economics and Development     Hybrid Journal   (Followers: 4)
International Journal of Embedded Systems     Hybrid Journal   (Followers: 5)
International Journal of Energy Optimization and Engineering     Hybrid Journal   (Followers: 5)
International Journal of Engine Research     Hybrid Journal   (Followers: 1)
International Journal of Engineering & Technology     Open Access   (Followers: 6)
International Journal of Engineering and Future Technology     Open Access  
International Journal of Engineering and Manufacturing     Open Access   (Followers: 1)
International Journal of Engineering and Technologies     Open Access   (Followers: 1)
International Journal of Engineering Business Management     Open Access   (Followers: 2)
International Journal of Engineering Education     Full-text available via subscription   (Followers: 6)
International Journal of Engineering Management and Economics     Hybrid Journal   (Followers: 4)
International Journal of Engineering Mathematics     Open Access   (Followers: 3)
International Journal of Engineering Pedagogy     Open Access  
International Journal of Engineering Practical Research     Open Access  
International Journal of Engineering Research in Africa     Full-text available via subscription   (Followers: 3)
International Journal of Engineering Science     Hybrid Journal   (Followers: 6)
International Journal of Engineering Systems Modelling and Simulation     Hybrid Journal   (Followers: 10)
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Social Justice, and Peace     Open Access   (Followers: 4)
International Journal of Environmental Engineering     Hybrid Journal   (Followers: 6)
International Journal of Experimental Design and Process Optimisation     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 37)
International Journal of Foresight and Innovation Policy     Hybrid Journal   (Followers: 6)
International Journal of Fracture     Hybrid Journal   (Followers: 12)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geotechnical Engineering     Hybrid Journal   (Followers: 6)
International Journal of Grid and Utility Computing     Hybrid Journal  
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 35)
International Journal of Heat and Mass Transfer     Hybrid Journal   (Followers: 205)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 6)
International Journal of Imaging Systems and Technology     Hybrid Journal   (Followers: 1)
International Journal of Impact Engineering     Hybrid Journal   (Followers: 9)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 5)
International Journal of Innovation Science     Hybrid Journal   (Followers: 9)
International Journal of Innovative Technology and Research     Open Access   (Followers: 2)
International Journal of Integrated Engineering     Open Access  
International Journal of Intelligent Engineering Informatics     Hybrid Journal  
International Journal of Intelligent Systems and Applications in Engineering     Open Access   (Followers: 3)
International Journal of Lifecycle Performance Engineering     Hybrid Journal   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 7)
International Journal of Manufacturing Research     Hybrid Journal   (Followers: 7)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 8)
International Journal of Marine Engineering Innovation and Research     Open Access  
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 11)
International Journal of Mathematics in Operational Research     Hybrid Journal  
International Journal of Medical Engineering and Informatics     Hybrid Journal   (Followers: 3)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 8)
International Journal of Mobile Network Design and Innovation     Hybrid Journal   (Followers: 2)
International Journal of Multiphase Flow     Hybrid Journal   (Followers: 7)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 7)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 3)
International Journal of Navigation and Observation     Open Access   (Followers: 20)
International Journal of Network Management     Hybrid Journal   (Followers: 1)
International Journal of Nonlinear Dynamics and Control     Hybrid Journal  
International Journal of Nonlinear Sciences and Numerical Simulation     Hybrid Journal  
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (Followers: 11)
International Journal of Optics     Open Access   (Followers: 7)
International Journal of Organisational Design and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (Followers: 8)
International Journal of Pavement Engineering     Hybrid Journal   (Followers: 6)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 5)
International Journal of Plastics Technology     Hybrid Journal   (Followers: 2)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
International Journal of Polymer Science     Open Access   (Followers: 24)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (Followers: 9)
International Journal of Precision Engineering and Manufacturing-Green Technology     Hybrid Journal   (Followers: 2)
International Journal of Precision Technology     Hybrid Journal   (Followers: 1)
International Journal of Pressure Vessels and Piping     Hybrid Journal   (Followers: 20)
International Journal of Production Economics     Hybrid Journal   (Followers: 14)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 5)
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 3)
International Journal of Quantum Information     Hybrid Journal   (Followers: 4)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access   (Followers: 1)
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 14)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 9)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 5)
International Journal of Science Engineering and Advance Technology     Open Access   (Followers: 1)
International Journal of Sediment Research     Full-text available via subscription   (Followers: 3)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Service Science, Management, Engineering, and Technology     Full-text available via subscription   (Followers: 1)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal   (Followers: 2)
International Journal of Social Robotics     Hybrid Journal   (Followers: 3)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 6)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 8)
International Journal of Speech Technology     Hybrid Journal   (Followers: 8)
International Journal of Spray and Combustion Dynamics     Hybrid Journal   (Followers: 14)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 5)
International Journal of Systems and Service-Oriented Engineering     Full-text available via subscription  
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 3)
International Journal of Technoethics     Full-text available via subscription   (Followers: 2)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Journal of Telemedicine and Applications     Open Access   (Followers: 4)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 16)
International Journal of Thermodynamics     Open Access   (Followers: 8)
International Journal of Turbo & Jet-Engines     Hybrid Journal   (Followers: 4)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 1)
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 6)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (Followers: 3)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal   (Followers: 1)
International Journal on Artificial Intelligence Tools     Hybrid Journal   (Followers: 7)

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Journal Cover Forschung im Ingenieurwesen
  [SJR: 0.188]   [H-I: 14]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1434-0860 - ISSN (Online) 0015-7899
   Published by Springer-Verlag Homepage  [2354 journals]
  • Ein Matrix-Berechnungsmodell zur Simulation und schnellen Berechnung der
           mittleren Temperaturdifferenz mehrgängiger
           Kreuzstrom-Plattenwärmeübertrager
    • Authors: Torben Möller; Olaf Strelow
      Pages: 357 - 369
      Abstract: Zusammenfassung Zur konstruktiven Auslegung mehrgängiger Kreuzstrom-Plattenwärmeübertrager wird ein schnelles Berechnungsverfahren für die mittlere Temperaturdifferenz vorgestellt. Innerhalb der einzelnen Bereiche des Plattenwärmeübertragers findet eine reine Kreuzstromführung ohne Quervermischung statt. Zwischen den Bereichen hingegen werden beide Ströme aufgrund von Umlenkungen oder Mischungszonen stets quervermischt. Die einzelnen Plattenelemente eines Bereiches sind immer gleichmäßig durchflutet und werden direkt angeströmt. Das Berechnungsverfahren basiert auf einem allgemeinen Matrix-Simulationsmodell für zunächst beliebige Schaltungsvarianten. Bei den verschiedenen Baureihen der Kreuzstrom-Plattenwärmeübertrager werden bestimmte Randbedingungen für die Kopplung der Bereiche vorab festgelegt, um so immer eine möglichst optimale mittlere Temperaturdifferenz zu gewährleisten. Neben komplexen Schaltungsvarianten wird dabei auch die sog. Kreuzgegenstrom-Schaltung erhalten. Mit Bezug der Temperaturdifferenz einer Schaltung auf den Wert des Gegenstromapparates wird ein entsprechender Korrekturfaktor für die mittlere Temperaturdifferenz definiert. Verschiedene grundlegende Schaltungsvarianten werden verglichen und anhand dieses Korrekturfaktors bewertet. Für die in der Praxis relevanten Schaltungen wird das Simulationsmodell sehr schnell und einfach gelöst. Das Berechnungsverfahren kann zukünftig in die Auslegungssoftware entsprechender Plattenwärmeübertrager implementiert werden, um so immer die optimale Schaltung zu ermitteln.
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0213-5
      Issue No: Vol. 81, No. 4 (2017)
       
  • Erratum zu: Ein Matrix-Berechnungsmodell zur Simulation und schnellen
           Berechnung der mittleren Temperaturdifferenz mehrgängiger
           Kreuzstrom-Plattenwärmeübertrager
    • Authors: Torben Möller; Olaf Strelow
      Pages: 371 - 371
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0236-y
      Issue No: Vol. 81, No. 4 (2017)
       
  • Verbesserung der Vorhersagegenauigkeit von Metamodellen
    • Authors: Thomas Tassler; Markus Israel; Martin-Friedrich Goede; Klaus Dilger; Klaus Dröder
      Pages: 373 - 382
      Abstract: Zusammenfassung Dieses Paper beschreibt eine Vorgehensweise zur Verbesserung der Vorhersagegenauigkeit am Beispiel eines mechanischen Fügeprozesses, dem Halbhohlstanznieten. Auf Basis zahlreicher Finite Elemente Simulationen wird ein mathematisches Ersatzmodell (funktionaler Zusammenhang zwischen Eingabegrößen und Ergebnisgrößen) aufgebaut, was anschließend durch zusätzliche experimentelle Ergebnisse ergänzt wird. Durch die Kombination zahlreicher simulativer Berechnungen und aufwändiger experimenteller Versuche kann die Abbildungsgenauigkeit der Ersatzmodelle verbessert werden.
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0215-3
      Issue No: Vol. 81, No. 4 (2017)
       
  • Bootstrap Monte Carlo Simulation of Reliability and Confidence Level with
           Periodical Maintenance
    • Authors: Frank Müller; Peter Zeiler; Bernd Bertsche
      Pages: 383 - 393
      Abstract: The bootstrap Monte Carlo simulation (BMCS) is presented as a new method for determining the reliability and confidence level of a general technical system with periodical maintenance. The method can be implemented on the basis of pure samples of failure times or of the mean value distributions in combination with the corresponding sample size of reliability. The BMCS does not require special distribution types and facilitates both the prediction and demonstration of reliability. Firstly, the bootstrap method for determining a confidence interval of a distribution function is investigated in order to verify the use of BMCS as a new method. The confidence level calculated by bootstrapping is therefore to be compared with the confidence level based on the beta-distribution. The accuracy of the BMCS shall subsequently be investigated by observing a component with periodical renewal. The confidence level of the reliability with periodical renewal calculated using the BMCS will be compared with the confidence level determined using the method of moments. Finally, a parameter study is carried out, and a case study as well as the potential of the BMCS shall be presented.
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0220-6
      Issue No: Vol. 81, No. 4 (2017)
       
  • Low-loss gears precision planetary gearboxes: reduction of the load
           dependent power losses and efficiency estimation through a hybrid
           analytical-numerical optimization tool
    • Authors: F. Concli
      Pages: 395 - 407
      Abstract: In the field of robotics, extremely accurate gearboxes are mandatory in order to ensure the adequate precision required by the automatic processes. For these applications, planetary gearboxes represent one of the most attractive solutions because they ensure high reduction ratios in a compact solution. However, their compactness and high power density, imply some thermal limitations. In order to overcome this problem, new gear designs have been studied by a hybrid analytical-numerical approach in order to reduce the power dissipation and, consequently, the operating temperatures. The efficiency increase is obtained mainly by a reduction of the module of the gears. This, together with other modifications of the tooth form (pressure angle, profile shift, etc.), allows to reduce the relative sliding between the tooth flanks that causes the power loss maintaining at the same time an adequate load carrying capacity. Low-loss gears have already been studied by other authors on bigger gears. Furthermore, by means of dedicated CFD simulations performed with an especially developed tool based on the open-source code OpenFOAM®, it has been shown that the sliding optimized design has a positive impact also on the churning power losses. The global winning in terms of reduction of the gear meshing power losses can be assessed in about 50%, depending on the reduction ratio. The new design has been validated by means of experimental tests performed in the internal laboratory of the company. The results have fully validated both the numerical approach and the new design.
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0242-0
      Issue No: Vol. 81, No. 4 (2017)
       
  • Curvature interference characteristic of conical surface enveloping
           conical worm
    • Authors: Yaping Zhao; Qingxiang Meng
      Pages: 409 - 419
      Abstract: The theory to distinguish whether the curvature interference happens or not is well established for the enveloping conical worm. Some important results, such as the meshing function, the equation of the enveloping conical worm helicoid, and the curvature interference limit function, are all obtained. The foundation of computing the curvature interference limit line is to solve the system of nonlinear equations. A technique based on the elimination method and the geometric construction is proposed, which can be employed to study the existence of the solution of a system of nonlinear equations and to solve all the solutions of this system within the given solving domain. By means of the theory and technique brought forward, it is discovered that there usually are two curvature interference limit lines separately on each side of a tooth of an enveloping conical worm. When the number of the enveloping conical worm threads is smaller, the curvature interference in general does not happen on the both sides of a tooth. The avoiding mechanism of the curvature interference is that the limit line does not exist during the real cutting mesh because the limit line is inside the entity of the enveloping conical worm and its conjugate line is outside the entity of the grinding wheel. The numerical outcome shows that, the toe on the \(e\) flank has the greatest potential risk to be subjected to the undercutting.
      PubDate: 2017-12-01
      DOI: 10.1007/s10010-017-0250-0
      Issue No: Vol. 81, No. 4 (2017)
       
  • Foreword
    • Authors: Karsten Stahl
      Pages: 57 - 58
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0248-7
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • Evaluation of gear noise behaviour with application force level
    • Authors: T. Utakapan; B. Kohn; M. Fromberger; M. Otto; K. Stahl
      Pages: 59 - 64
      Abstract: Reducing excessive vibration and undesired noise is one of the most important goals throughout the whole development phases of gearboxes. Among different development stages, different technical measurements are available to estimate the excitation behaviour of gear meshes. However, the comparison of the result of these measurement types among the development stages may be inconsistent due to different dimensions. In order to ensure the best comparability as well as comprehensive interpretation of the vibration characteristics of gear meshes, an application force level was developed. This characteristic value allows noise behaviour evaluation by means of different measurement types. Moreover, the evaluation boundary of this characteristic value is customizable to encourage the flexibility for further specific evaluations. In this article, the formulation of application force level is derived and its usage is shown. Although the application force level was intentionally developed for the gear design, it can also be applied to other kinds of application fields. The application force level is the result of the research project funded by the German research association for drive technology (FVA).
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0228-y
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • A new standard of epicyclic efficiency – a practical comparison of
           planetary and orbitless gear-heads
    • Authors: L. J. Stocco; R. Gloeckner
      Pages: 153 - 161
      Abstract: An Orbitlesspat.pend. gear-head is a novel fixed-ratio Epicyclic gear-head with crank-shaft planet pinions and two carriers but no ring gear. It provides half the reduction ratio of a Planetary gear-head with similar pinions and shares many characteristics such as torque splitting and co-axial drive shafts that spin in a common direction. Three prototype Orbitless gear-heads are constructed, each with a different planet support mechanism. It is shown that load capacity is marginally improved by using ball instead of plain bearings, and greatly improved by mounting the bearings to the planets rather than the carriers. In comparison to an off-the-shelf Planetary gear-head, friction losses are reduced by up to 59% and total input power is reduced by up to 33% over the operating range of the motor and gear-head.
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0235-z
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • Method for the pre-dimensioning of beveloid gears
    • Authors: Timon Schöler; Hansgeorg Binz; Matthias Bachmann
      Pages: 199 - 206
      Abstract: Conical involute gears – also referred to as beveloid gears – are based on cylindrical involute gears, as both gear geometries are based on a basic rack. They differ from cylindrical gears in that the beveloid gears’ addendum modification along the face width is not constant, but linearly variable. This allows beveloid gears to transfer mechanical power with parallel, intersecting or even skewed axes up to shaft angles of approximately 20°, whereas bevel or hypoid gears are applied with larger shaft angles. Compared with both cylindrical and bevel gears, there is less knowledge available concerning the design of beveloid gears. Existing tools for contact analysis are based on predetermined main gearing data. Therefore a method to pre-dimension main beveloid gearing data based on application requirements was developed. Initially, equivalent cylindrical gears are dimensioned and then transformed into beveloid gears with the required mounting positions. The method involves pre-optimizing of beveloid gears with several targets. Firstly, to comply with selected boundaries of the addendum modification coefficient, as well as to minimize ease-off between the tooth flanks achieved by a centric contact pattern and ensure adequate tip clearance by reducing tip circles. The method was implemented in a software environment for tooth contact analysis and applied to a wide range of data sets. The evaluation demonstrated the efficient design of the main data of beveloid gears including pre-optimization to achieve the objectives mentioned previously. In further optimizations, the microgeometry of beveloid gears must be adapted regarding the gap that occurs between the flanks.
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0237-x
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • Elastic deformation of a hypoid gearbox
    • Authors: Markus Daffner; Michael Otto; Karsten Stahl
      Pages: 215 - 220
      Abstract: High load carrying capacity in the gear mesh can be achieved when the contact load is well distributed. Designing an adequate tooth flank geometry requires a thorough calculation approach. This is particularly important for automotive hypoid gearboxes with aluminum housing. In this paper, the deformation analysis of housing, bearings and shafts for a hypoid gearbox is validated by measurements at a static test rig. The challenge of compensating friction effects to get high-quality measurement results is successfully met by the presented approach. There are several computer programs to calculate the elastic deformation behavior of the system shaft-bearing-housing. Most of the calculation programs use analytical approaches. The advantage of these programs, in comparison to a full FEM approach, is an efficient parameterization of gears and a very short calculation time, while delivering high precision results. The deformation behavior of housings can be considered in different ways. The deformation behavior of a bearing seat can be modelled by its stiffnesses. For housings with lower stiffnesses (for example aluminum housings), crossover influences become more and more important. The deformation behavior of a housing can be taken into account by a stiffness matrix. The stiffness matrix of a housing can be determined by using the finite elements method. Therefore, the complex elastic deformation behavior of housings can be considered in analytical calculation approaches. Within the scope of a research project, investigations have been made to validate the calculated elastic deformations of the shaft-bearing-housing system. For this purpose, deformation measurements of a test gearbox were taken by using a 3D coordinate measuring machine. The test gearbox is static and consists of a hypoid gearbox for automotive applications. The input torque is provided by a lever mechanism. The elastic deformation of the test gear box has been measured and compared to calculation results. Therefore, different approaches of modelling the elastic deformation behavior of the housing can be validated and compared to each other.
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0216-2
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • Development and investigation of austempered ductile iron (ADI) for
           thick-walled gear components
    • Authors: Jochen Lohmiller; Jürgen Hoffmeister; Jörg Hermes; Michel Ansorg; Hans Dhonau
      Pages: 253 - 263
      Abstract: Austempered ductile irons (ADI) are attractive for thick-walled and highly stressed gear components due to the possibility to design complex structures requiring a combination of high strength and moderate ductility. In this study, ADI was developed and optimized for industrial planetary carriers with shaft diameters ranging from 120 to 460 mm. The material was characterized by correlating fatigue properties to microstructural parameters using samples prepared from cast and heat treated carriers. The optimized castings exhibit a tension-compression fatigue strength enhanced by 25% compared with castings of the same size of nominally the same material grade. A scaling behavior was developed in order to estimate fatigue strength on the basis of the maximum defect size in the tested volume. The maximum defect can be either a graphite nodule or a micropore. By optimizing the microstructure of a thick-walled casting according to the typical loading conditions, a structurally graded component with a uniform degree of utilization can be obtained. This allows efficient castings and heat treatment of thick-walled ADI parts.
      PubDate: 2017-09-01
      DOI: 10.1007/s10010-017-0238-9
      Issue No: Vol. 81, No. 2-3 (2017)
       
  • Correction to: Geometric modeling and torque analysis of the magnetic
           nutation gear drive
    • Authors: Ding-jian Huang; Li-gang Yao; Wen-jian Li; Jun Zhang
      Abstract: Correction to: Forsch Ingenieurwes 2017 https://doi.org/10.1007/s10010-017-0246-9 Due to an oversight the captions of Figs. 6 and 7 are incorrect. The correct captions are given …
      PubDate: 2017-10-27
      DOI: 10.1007/s10010-017-0257-6
       
  • Studie zur Ermittlung von Potenzialen zur Leistungssteigerung von
           trockenlaufenden Kupplungssystemen mittels Temperaturverteilungsmessung
    • Authors: Albert Albers; Sascha Ott; Jonas Kniel; Michael Basiewicz
      Abstract: Zusammenfassung Neue Produkte sollen aus Gründen der Effizienz immer möglichst grenzwertig ausgelegt werden. Ein Funktionsausfall beim Endkunden muss unbedingt verhindert werden. Um die immer weiter steigenden Leistungsanforderungen mit der notwendigen Funktionssicherheit in Einklang zu bringen, stellt dieser Beitrag eine Studie zur Weiterentwicklung bestehender Systeme auf Basis der räumlich hochauflösenden Messung der Temperaturverteilung vor. Bereits veröffentlichte Arbeiten zu diesem Thema haben sich zunächst mit der prinzipiellen Machbarkeit der räumlich hochauflösenden Messung der Temperaturverteilung, anschließend mit einer Fehlerbetrachtung der Messmethode und letztlich mit der Vorstellung ausgewählter Messungen beschäftigt, bei denen nur ein Parameter, wie z. B. die Flächenpressung, variiert wurde. Die Potenziale der räumlich hochauflösenden Messung der Temperaturverteilung für die Optimierung von trockenlaufenden Kupplungssystemen werden aufgezeigt, indem das thermo-mechanische Verhalten bei unterschiedlichsten Beanspruchungen analysiert und verglichen wird. Dazu wurde eine umfangreiche Messreihe durchgeführt, bei welcher das Verhalten bei unterschiedlichen Gleitgeschwindigkeiten, Flächenpressungen und zu bremsenden Massenträgheiten untersucht wird. Der Fokus in diesem Beitrag liegt auf der Beschreibung der gewinnbringenden Anwendung der räumlich hochauflösenden Messung der Temperaturverteilung als Werkzeug zur Erweiterung des Systemverständnisses, mithilfe dessen Potenziale zur Leistungssteigerung ermittelt werden können.
      PubDate: 2017-10-20
      DOI: 10.1007/s10010-017-0256-7
       
  • Arbeitspunktabhängige Durchflussregelung einer rotatorischen
           Blutpumpe
    • Authors: Lukas Bergmann; Daniel Rüschen; Raffael Amacher; Oliver Nelles; Steffen Leonhardt; Marian Walter
      Abstract: Zusammenfassung Blutpumpen und Herzunterstützungssysteme werden immer häufiger erfolgreich in der Therapie von Patienten mit akutem Herzversagen eingesetzt. Dabei bieten vor allem rotatorische Blutpumpen durch ihre robuste und einfache Bauweise viele Vorteile. Um eine optimale Blutversorgung des Patienten gewährleisten zu können, ist eine Regelung des Blutflusses durch die Pumpe unabdingbar. Aus diesem Grund wurde für die rotatorische Diagonalblutpumpe Medos DeltaStream DP1 eine nichtlineare Regelung entworfen. Mithilfe dieser Regelung ist es möglich, sowohl konstante Blutflüsse als auch verschiedene Blutflusstrajektorien bei gleichzeitig schlagendem Herzen zu regeln. Zur statischen, nichtlinearen Identifikation der Blutpumpe wurde der Local Linear Model Tree Algorithmus (LOLIMOT) verwendet. Die dynamische Identifikation erfolgte durch die Linearisierung dieses Modells in unterschiedlichen Arbeitspunkten. Das daraus resultierende Gesamtmodell bildete die Grundlage für zwei verschiedene Regleransätze: Zunächst ein auf arbeitspunktabhängigen PI- bzw. PID-Reglern basierender Ansatz und im Weiteren ein Gain Scheduled PID-Regler. Beide Verfahren wurden anschließend jeweils um eine Störgrößenaufschaltung erweitert. Abschließend konnte mit den ausgelegten Reglern ein gutes Folgeverhalten der getesten Sollfusstrajektorien gezeigt werden.
      PubDate: 2017-10-17
      DOI: 10.1007/s10010-017-0254-9
       
  • Überhöhungsfaktor für erzwungene Konvektion auf kleinen
           Heizelementen
    • Authors: Erwin Kaiser
      Abstract: Zusammenfassung Der konvektive Wärmeübergang auf kleinen, flach montierten Heizelementen interessiert für Mikroelektronik und thermische Sensoren. Der maximale Wärmeübergang liegt im Anfangsbereich des überströmten Heizelements mit der Länge l*. Der über die Heizelementlänge l* gemittelte Wärmeübergangskoeffizient h* ist größer als der Wärmeübergangskoeffizient h am gleichen Ort, wenn z. B. die ganze Platte oder der Zylinderumfang beheizt ist. Zur Charakterisierung dieses Sachverhalts wird der Überhöhungsfaktor K = h*/h eingeführt. Gegenübergestellt werden K‑Werte aus Grenzschichtrechnungen, Wärmeübergangsmessungen, Kalibrierung von thermischen Wandschubspannungssensoren und numerischen Modellen (im Bereich von l* = 0,01 bis 4 mm). Der Überhöhungsfaktor K ist abhängig von der Überströmlänge l*, dem Wärmeübergangskoeffizienten h und der thermischen Isolation.
      PubDate: 2017-10-06
      DOI: 10.1007/s10010-017-0255-8
       
  • Zeiteffiziente Methodik zur Ermittlung des Reibungsverhaltens
           nasslaufender Lamellenkupplungen mit Carbon-Reibbelag
    • Authors: U. Stockinger; H. Pflaum; K. Stahl
      Abstract: Zusammenfassung Das tribologische System aus Reibpaarung, Schmierstoff und Beanspruchungen bestimmt die Reibcharakteristik von nasslaufenden Lamellenkupplungen. Aufgrund zahlreicher Einflussparameter und deren Wechselwirkungen ist das Reibungsverhalten nicht theoretisch vorherbestimmbar. Die Abstimmung von Reibpaarung und Schmierstoff erfordert somit experimentelle Untersuchungen. Im Rahmen eines Forschungsvorhabens der Forschungsvereinigung Antriebstechnik e. V. (FVA) wurde eine zweistufige Testmethodik zur reproduzierbaren Beschreibung des Reibungsverhaltens von Lamellenkupplungen mit Carbon-Reibbelägen entwickelt. Nach einem Einlauf werden Laststufen mit unterschiedlichen Pressungs-Gleitgeschwindigkeits-Kombinationen (p-v-Variationen) durchlaufen. Das Konditionierungsverhalten des Reibsystems wird mithilfe eines Dauerschaltversuchs und nachfolgenden p-v-Variationen bewertet. Anhand dieser Testmethodik wird der Schmierstoffeinfluss auf das Reibungsverhalten beschrieben.
      PubDate: 2017-09-19
      DOI: 10.1007/s10010-017-0253-x
       
  • Overall optimization of electrodynamic shifting systems
    • Authors: A. Reul; R. König; S. Rinderknecht
      Abstract: The internal shifting system of a transmission has a significant influence on the dynamics, costs and comfort of the transmission. A comprehensive study of the shifting system makes it possible to show optimization potentials on the control, the mechanical and the electrical path of electrodynamic shifting systems. Therefore, various simulation and optimization models are used. Especially through a new optimization approach, it is possible to use optimization procedures at an early stage of the design process and to use them for design and modeling. By a detailed consideration of the synchronization process, it is also possible to further significantly improve the dynamics. This is supported by a modular and cost-efficient test rig concept, which makes it easy to compare the results and the models. In addition, the test rig provides the possibility to carry out investigations of dog clutches.
      PubDate: 2017-09-11
      DOI: 10.1007/s10010-017-0252-y
       
  • Ein Konzept zur Wirkungsgradoptimierung von Einzylinder-Dieselgeneratoren
           mittels Optimalsteuerung und Extremum-Seeking
    • Authors: Johannes Popp; Joachim Deutscher
      Abstract: Zusammenfassung In diesem Beitrag wird ein Konzept zur Wirkungsgradoptimierung hybrider Energiesysteme vorgestellt, welches insbesondere eine hochdynamisch vorgebbare Trajektorie des momentenbildenden Generatorstroms sowie während der Systemdimensionierung wählbare Konstruktionsparameter als Optimierungsfreiheitsgrade berücksichtigt. Das zweistufige Vorgehen wird anhand des Versuchssystems eines Einzylinder-Dieselgenerators veranschaulicht. Zuerst erfolgt die Ableitung eines modellbasierten Optimalsteuerungsproblems und dessen numerische Lösung. Dieser Ansatz dient zur Bestimmung einer optimalen Betriebsstrategie sowie Maschinendimensionierung und ermöglicht die Analyse der hochdynamisch vorgebbaren Stromtrajektorie. Im zweiten Schritt folgt die Diskussion der Probleme, welche bei der Übertragung der Steuerung auf eine reale Maschine auftreten. Diesbezüglich wird ein modellfreies Echtzeitoptimierungskonzept basierend auf Extremum-Seeking vorgestellt. Die Wirksamkeit sowohl des modellbasierten als auch des modellfreien Ansatzes wird anhand von Simulations- und Messergebnissen demonstriert.
      PubDate: 2017-09-05
      DOI: 10.1007/s10010-017-0251-z
       
  • Characterization of TEHL contacts of thermoplastic gears
    • Authors: Enzo Maier; Andreas Ziegltrum; Thomas Lohner; Karsten Stahl
      Abstract: Thermoplastic materials generally show low specific weight, low coefficients of friction, noise damping behavior and demonstrate low-cost manufacturing by injection molding. This qualifies thermoplastics for the use in lightweight gear design and more generally for an increase in resource efficiency. However, moderate thermo-mechanical material properties and detrimental accumulation of contact heat limit its applications to lowly loaded machine elements. Lubrication allows pushing these boundaries. In this work, the thermo-elastohydrodynamically lubricated (TEHL) contact of steel-thermoplastic material pairings (hybrids) is analyzed by tribosimulation and at the FZG twin-disk test rig for representative thermoplastic gear operating conditions. After a comparison to plain steel TEHL contacts, the focus is on friction, film thickness and heat management. Results show that high surface conformity leads to low hydrodynamic pressures and thus very low friction. Furthermore, local contact temperatures affect tribological performance. The considered steel-thermoplastic TEHL contact operates in the transition region between hard TEHL and soft EHL.
      PubDate: 2017-06-29
      DOI: 10.1007/s10010-017-0230-4
       
 
 
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