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  Subjects -> ENGINEERING (Total: 1957 journals)
    - CHEMICAL ENGINEERING (150 journals)
    - CIVIL ENGINEERING (146 journals)
    - ELECTRICAL ENGINEERING (84 journals)
    - ENGINEERING (1124 journals)
    - ENGINEERING MECHANICS AND MATERIALS (284 journals)
    - HYDRAULIC ENGINEERING (43 journals)
    - INDUSTRIAL ENGINEERING (53 journals)
    - MECHANICAL ENGINEERING (73 journals)

ENGINEERING (1124 journals)            First | 2 3 4 5 6 7 8 9 | Last

International Journal of Innovation Science     Full-text available via subscription   (5 followers)
International Journal of Integrated Engineering     Open Access   (1 follower)
International Journal of Intelligent Engineering Informatics     Hybrid Journal  
International Journal of Intelligent Systems and Applications in Engineering     Open Access   (1 follower)
International Journal of Lifecycle Performance Engineering     Hybrid Journal  
International Journal of Machine Tools and Manufacture     Hybrid Journal   (4 followers)
International Journal of Manufacturing Research     Hybrid Journal   (7 followers)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (10 followers)
International Journal of Materials and Product Technology     Hybrid Journal   (4 followers)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (6 followers)
International Journal of Mathematics in Operational Research     Hybrid Journal   (1 follower)
International Journal of Medical Engineering and Informatics     Hybrid Journal   (5 followers)
International Journal of Micro Air Vehicles     Full-text available via subscription   (2 followers)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (1 follower)
International Journal of Microwave Science and Technology     Open Access   (3 followers)
International Journal of Mobile Network Design and Innovation     Hybrid Journal   (3 followers)
International Journal of Multiphase Flow     Hybrid Journal   (2 followers)
International Journal of Nanomanufacturing     Hybrid Journal   (1 follower)
International Journal of Nanoscience     Hybrid Journal   (1 follower)
International Journal of Nanotechnology     Hybrid Journal   (4 followers)
International Journal of Navigation and Observation     Open Access   (4 followers)
International Journal of Network Management     Hybrid Journal  
International Journal of Nonlinear Sciences and Numerical Simulation     Full-text available via subscription   (1 follower)
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (6 followers)
International Journal of Optics     Open Access   (1 follower)
International Journal of Organisational Design and Engineering     Hybrid Journal   (7 followers)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (6 followers)
International Journal of Pavement Engineering     Hybrid Journal   (2 followers)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (2 followers)
International Journal of Plasticity     Hybrid Journal   (6 followers)
International Journal of Plastics Technology     Hybrid Journal  
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (2 followers)
International Journal of Polymer Science     Open Access   (15 followers)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (8 followers)
International Journal of Precision Technology     Hybrid Journal  
International Journal of Pressure Vessels and Piping     Hybrid Journal   (2 followers)
International Journal of Production Economics     Hybrid Journal   (10 followers)
International Journal of Quality and Innovation     Hybrid Journal   (2 followers)
International Journal of Quality Engineering and Technology     Hybrid Journal   (2 followers)
International Journal of Quantum Information     Hybrid Journal  
International Journal of Rapid Manufacturing     Hybrid Journal   (4 followers)
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (4 followers)
International Journal of Renewable Energy Technology     Hybrid Journal   (7 followers)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (2 followers)
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (1 follower)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (2 followers)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal  
International Journal of Social Robotics     Hybrid Journal   (1 follower)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (1 follower)
International Journal of Space Science and Engineering     Hybrid Journal   (2 followers)
International Journal of Speech Technology     Hybrid Journal   (2 followers)
International Journal of Spray and Combustion Dynamics     Full-text available via subscription   (5 followers)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (1 follower)
International Journal of Surface Science and Engineering     Hybrid Journal   (7 followers)
International Journal of Sustainable Engineering     Hybrid Journal   (7 followers)
International Journal of Sustainable Manufacturing     Hybrid Journal   (4 followers)
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (2 followers)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (1 follower)
International Journal of Technology Policy and Law     Hybrid Journal   (3 followers)
International Journal of Telemedicine and Applications     Open Access   (2 followers)
International Journal of Thermal Sciences     Hybrid Journal   (4 followers)
International Journal of Thermodynamics     Open Access   (1 follower)
International Journal of Turbo & Jet-Engines     Full-text available via subscription  
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   (5 followers)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (1 follower)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (2 followers)
International Journal of Vehicle Safety     Hybrid Journal   (3 followers)
International Journal of Vehicular Technology     Open Access   (1 follower)
International Journal of Virtual Technology and Multimedia     Hybrid Journal   (4 followers)
International Journal of Wavelets, Multiresolution and Information Processing     Hybrid Journal  
International Journal on Artificial Intelligence Tools     Hybrid Journal   (4 followers)
International Nano Letters     Open Access   (5 followers)
International Review of Applied Sciences and Engineering     Full-text available via subscription  
Inverse Problems in Science and Engineering     Hybrid Journal   (3 followers)
Ionics     Hybrid Journal  
IPTEK The Journal for Technology and Science     Open Access  
IRBM News     Full-text available via subscription  
Ironmaking & Steelmaking     Hybrid Journal   (2 followers)
Irrigation and Drainage Systems     Hybrid Journal  
ISA Transactions     Full-text available via subscription  
ISRN Communications and Networking     Open Access   (4 followers)
ISRN Nanotechnology     Open Access  
ISRN Signal Processing     Open Access  
ISRN Thermodynamics     Open Access  
ISRN Tribology     Open Access  
IT Professional     Full-text available via subscription   (1 follower)
Journal of Biosensors & Bioelectronics     Open Access   (1 follower)
Journal of Advanced Manufacturing Systems     Hybrid Journal   (8 followers)
Journal of Aerosol Science     Hybrid Journal   (2 followers)
Journal of Aerospace Engineering     Full-text available via subscription   (74 followers)
Journal of Alloys and Compounds     Hybrid Journal   (6 followers)
Journal of Analytical and Applied Pyrolysis     Hybrid Journal   (3 followers)
Journal of Analytical Science & Technology     Open Access   (4 followers)
Journal of Analytical Sciences, Methods and Instrumentation     Open Access   (1 follower)
Journal of Applied Analysis     Full-text available via subscription  

  First | 2 3 4 5 6 7 8 9 | Last

Journal of Computational and Nonlinear Dynamics    [6 followers]  Follow    
  Full-text available via subscription Subscription journal
     ISSN (Print) 1555-1415 - ISSN (Online) 1555-1423
     Published by ASME International Homepage  [25 journals]   [SJR: 0.606]   [H-I: 17]
  • Stability and Hopf Bifurcation in a Three-Species Food Chain System With
           Harvesting and Two Delays
    • Authors: Zhang Z; Yang H.
      Abstract: In this paper, we analyze the dynamics of a delayed food chain system with harvesting. Sufficient conditions for the local stability of the positive equilibrium and for the existence of Hopf bifurcation are obtained by analyzing the associated characteristic equation. Formulas for determining the direction of Hopf bifurcation and the stability of the bifurcating periodic solutions are derived by applying the normal form method and center manifold theorem. Finally, numerical simulation results are presented to validate the theoretical analysis.
      PubDate: Thu, 09 Jan 2014 00:00:00 GMT
       
  • Control Constraint of Underactuated Aerospace Systems
    • Authors: Masarati P; Morandini M, Fumagalli A.
      Abstract: This paper discusses the problem of control constraint realization applied to the design of maneuvers of complex underactuated systems modeled as multibody problems. Applications of interest in the area of aerospace engineering are presented and discussed. The tangent realization of the control constraint is discussed from a theoretical point of view and is used to determine feedforward control of realistic underactuated systems. The effectiveness of the computed feedforward input is subsequently verified by applying it to more detailed models of the problems, in the presence of disturbances and uncertainties in combination with feedback control. The problems are solved using a free general-purpose multibody software that writes the constrained dynamics of multifield problems formulated as differential-algebraic equations. The equations are integrated using unconditionally stable algorithms with tunable dissipation. The essential extension to the multibody code consisted of the addition of the capability to write arbitrary constraint equations and apply the corresponding reaction multipliers to arbitrary equations of motion. The modeling capabilities of the formulation could be exploited without any undue restriction on the modeling requirements.
      PubDate: Thu, 09 Jan 2014 00:00:00 GMT
       
  • Neural Dynamics and Newton–Raphson Iteration for Nonlinear
           Optimization
    • Authors: Guo D; Zhang Y.
      Abstract: In this paper, a special type of neural dynamics (ND) is generalized and investigated for time-varying and static scalar-valued nonlinear optimization. In addition, for comparative purpose, the gradient-based neural dynamics (or termed gradient dynamics (GD)) is studied for nonlinear optimization. Moreover, for possible digital hardware realization, discrete-time ND (DTND) models are developed. With the linear activation function used and with the step size being 1, the DTND model reduces to Newton–Raphson iteration (NRI) for solving the static nonlinear optimization problems. That is, the well-known NRI method can be viewed as a special case of the DTND model. Besides, the geometric representation of the ND models is given for time-varying nonlinear optimization. Numerical results demonstrate the efficacy and advantages of the proposed ND models for time-varying and static nonlinear optimization.
      PubDate: Thu, 09 Jan 2014 00:00:00 GMT
       
  • Toward Searching Possible Oscillatory Region in Order Space for Nonlinear
           Fractional-Order Systems
    • Authors: Tavazoei M.
      Abstract: Finding the oscillatory region in the order space is one of the most challenging problems in nonlinear fractional-order systems. This paper proposes a method to find the possible oscillatory region in the order space for a nonlinear fractional-order system. The effectiveness of the proposed method in finding the oscillatory region and special order sets placed in its boundary is confirmed by presenting some examples.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Distributed Operational Space Formulation of Serial Manipulators
    • Authors: Bhalerao KD; Critchley J, Oetomo D, et al.
      Abstract: This paper presents a new parallel algorithm for the operational space dynamics of unconstrained serial manipulators, which outperforms contemporary sequential and parallel algorithms in the presence of two or more processors. The method employs a hybrid divide and conquer algorithm (DCA) multibody methodology which brings together the best features of the DCA and fast sequential techniques. The method achieves a logarithmic time complexity (O(log(n)) in the number of degrees of freedom (n) for computing the operational space inertia (Λe) of a serial manipulator in presence of O(n) processors. The paper also addresses the efficient sequential and parallel computation of the dynamically consistent generalized inverse (J¯e) of the task Jacobian, the associated null space projection matrix (Ne), and the joint actuator forces (τnull) which only affect the manipulator posture. The sequential algorithms for computing J¯e, Ne, and τnull are of O(n), O(n2), and O(n) computational complexity, respectively, while the corresponding parallel algorithms are of O(log(n)), O(n), and O(log(n)) time complexity in the presence of O(n) processors.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Synchronization of Slowly Rotating Nonidentically Driven Pendula
    • Authors: Lazarek M; Nielaczny M, Czolczynski K, et al.
      Abstract: We study the synchronization of two rotating pendula mounted on a horizontal beam, which can roll on the parallel surface. The pendula are forced to rotate by different driving torques. It has been shown that after a transient two different types of synchronization between the pendula can be observed. The approximate analytical methods allow us to derive the synchronization conditions and explain the observed types of synchronous configurations. The energy balance in the system allows us to show how the energy is transferred between the pendula via the oscillating beam.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Full State Hybrid Projective Synchronization and Parameters Identification
           for Uncertain Chaotic (Hyperchaotic) Complex Systems
    • Authors: Zhang F; Liu S.
      Abstract: We introduce the definition of full state hybrid projective synchronization (FSHPS) with complex scaling factors for chaotic and hyperchaotic complex systems and design adaptive FSHPS schemes for uncertain chaotic complex systems under bounded disturbances with all possible situations of unknown parameters. The proposed schemes guarantee adaptive FSHPS between two chaotic complex systems with a small error bound and the convergence factors and dynamical control strength are added to regulate the convergence speed and increase robustness. Then we draw on the sufficient condition and necessary condition that the unknown parameters converge to their true values based on the persistency of excitation (PE) and linear independence (LI). At last, we realize adaptive FSHPS between uncertain complex Chen and Lü systems, which verify the feasibility and effectiveness of the presented schemes.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Vibration Analysis of Postbuckled Timoshenko Beams Using a Numerical
           Solution Methodology
    • Authors: Shojaei M; Ansari RR, Mohammadi VV, et al.
      Abstract: In this article, a numerical solution methodology is presented to study the postbuckling configurations and free vibrations of Timoshenko beams undergoing postbuckling. The effect of geometrical imperfection is taken into account, and the analysis is carried out for different types of boundary conditions. Based on Hamilton's principle, the governing equations and corresponding boundary conditions are derived. After introducing a set of differential matrix operators that is used to discretize the governing equations and boundary conditions, the pseudo-arc length continuation method is applied to solve the postbuckling problem. Then, the problem of free vibration around the buckled configurations is solved as an eigenvalue problem using the solution obtained from the nonlinear problem in the previous step. This study shows that, when the axial load in the postbuckling domain increases, the vibration mode shape of buckled beam corresponding to the fundamental frequency may change. Another finding that can be of great technical interest is that, for all types of boundary conditions and in both prebuckling and postbuckling domains, the natural frequency of imperfect beam is higher than that of ideal beam. Also, it is observed that, by increasing the axial load, the natural frequency of both ideal and imperfect beams decreases in the prebuckling domain, while it increases in the postbuckling domain. The reduction of natural frequency in the transition area from the prebuckling domain to the postbuckling domain is due to the severe instability of the structure under the axial load.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Nonlinear System Modeling and Application Based on System Equilibrium
           Manifold and Expansion Model
    • Authors: Liu X; Yuan Y.
      Abstract: A new modeling method for a nonlinear system by using equilibrium manifold (EM) and its expansion model (EME model) was presented. The property of the EME model was discussed, and the effect of mapping design to the model has been discussed. This paper also has researched the adaptivity analysis to the EME model. Then an approximate nonlinear model for an aircraft engine is applied, followed by an identification procedure for an aircraft engine. Simulations showed good precision of this model in capturing the nonlinear behavior of nonlinearities and had the simpler structure.
      PubDate: Wed, 30 Oct 2013 00:00:00 GMT
       
  • Wiener–Askey and Wiener–Haar Expansions for the Analysis and
           Prediction of Limit Cycle Oscillations in Uncertain Nonlinear Dynamic
           Friction Systems
    • Authors: Nechak L; Berger S, Aubry E.
      Abstract: This paper is devoted to the robust modeling and prediction of limit cycle oscillations in nonlinear dynamic friction systems with a random friction coefficient. In recent studies, the Wiener–Askey and Wiener–Haar expansions have been proposed to deal with these problems with great efficiency. In these studies, the random dispersion of the friction coefficient is always considered within intervals near the Hopf bifurcation point. However, it is well known that friction induced vibrations—with respect to the distance of the friction dispersion interval to the Hopf bifurcation point—have different properties in terms of tansient, frequency and amplitudes. So, the main objective of this study is to analyze the capabilities of the Wiener–Askey (general polynomial chaos, multielement generalized polynomial chaos) and Wiener–Haar expansions to be efficient in the modeling and prediction of limit cycle oscillations independently of the location of the instability zone with respect to the Hopf bifurcation point.
      PubDate: Wed, 25 Sep 2013 00:00:00 GMT
       
  • Energetic and Dynamic Analysis of Multifrequency Legged Robot Locomotion
           With an Elastically Suspended Load
    • Authors: Da X; Ackerman J, Seipel J.
      Abstract: Elastically suspended loads can reduce the energetic cost and peak forces of legged robot locomotion. However, legged locomotion frequently exhibits multiple frequency modes due to variable leg contact times, body pitch and roll, and transient locomotion dynamics. We used a simple hexapod robot to investigate the effect of multiple frequency components on the energetic cost, dynamics, and peak forces of legged robot locomotion using a high-speed motion tracking system and the fast Fourier transform (FFT). The trajectories of the robot body and the suspended load revealed that the robot was excited by both a body pitching frequency and the primary locomotion frequency. Both frequency modes affected the dynamics of the legged robot as the natural frequency of the elastic load suspension was varied. When the natural frequency of the load suspension was reduced below the primary locomotion and body pitching frequencies, the robot consumed less average power with an elastically suspended load versus a rigidly attached load. To generalize the experimental results more broadly, a modified double-mass coupled-oscillator model with experimental parameters was shown to qualitatively predict the energetic cost and dynamics of legged robot locomotion with an elastically suspended load. The experimental results and the theoretical model could help researchers better understand locomotion with elastically suspended loads and design load suspension systems that are optimized to reduce the energetic cost and peak forces of legged locomotion.
      PubDate: Tue, 17 Sep 2013 00:00:00 GMT
       
  • Optimal Control and Forward Dynamics of Human Periodic Motions Using
           Fourier Series for Muscle Excitation Patterns
    • Authors: Sharif Shourijeh M; McPhee J.
      Abstract: Forward dynamic simulations of a periodic forearm motion were developed in order to explore the efficiency of using a Fourier-series-based parameterization function for muscle excitations within dynamic optimization. The specific objectives of this study were to develop such a simulation and validate the predictions. Several time-integral objective functions, including muscle activation effort and metabolic energy, were used to see the effects of each on the optimal results. For validation, the motion and muscle electromyograms (EMGs) of three adult subjects were captured, where each trial was replicated twice. Fourier-series pattern parameterization was found to be an efficient choice for the muscle excitations in simulating human musculoskeletal dynamics.
      PubDate: Thu, 12 Sep 2013 00:00:00 GMT
       
  • Bifurcation and Chaotic Analysis of Aeroelastic Systems
    • Authors: Wang C; Chen C, Yau H.
      Abstract: The dynamic behavior of aeroelastic systems is governed by a complex interaction among inertial, elastic, and aerodynamic forces. To prevent system instability, the interaction among these forces must be properly understood. Accordingly, the present study utilizes the differential transformation method (DTM) to examine the nonlinear dynamic response of a typical aeroelastic system (an aircraft wing) under realistic operating parameters. The system behavior and onset of chaos are interpreted by means of bifurcation diagrams, Poincaré maps, power spectra, and maximum Lyapunov exponent plots. The results reveal the existence of a complex dynamic behavior comprising periodic, quasi-periodic and chaotic responses. It is shown that chaotic motion occurs at specific intervals for different trailing edge and leading edge angles with changing initial conditions. The results presented in this study provide a useful guideline for the design of aircraft wings and confirm the validity of the DTM method as a design and analysis tool for aeroelastic systems in general.
      PubDate: Thu, 12 Sep 2013 00:00:00 GMT
       
  • Hopf Instabilities in Free Piston Stirling Engines
    • Authors: Choudhary F; Balachandran B.
      Abstract: Free piston Stirling engines (FPSEs) are examples of closed cycle regenerative engines, which can be used to convert thermal energy into mechanical energy. These engines are multidegree-of-freedom dynamical systems, which are designed to operate in a periodic manner. Traditionally, for design purposes, linear models are used and the associated periodic orbits are meta-stable, making the system operations sensitive to disturbances. A preferred operating state would be a stable limit cycle, which can make the system dynamics robust to disturbances. To this end, in this article, it is investigated as to how to engineer Hopf bifurcations of an equilibrium solution in the β and double acting α FPSE configurations that could lead to attracting periodic solutions. Weakly nonlinear analyses are conducted and analytical relations governing the periodic motions are obtained and studied in the vicinity of Hopf bifurcation points. The analytical predictions are confirmed through numerical simulations that are based upon reported engine parameters. The overall analytical-numerical approach pursued here could serve as a tool for using nonlinearity in the design of FPSEs, thereby enhancing the robustness of device operations.
      PubDate: Thu, 12 Sep 2013 00:00:00 GMT
       
  • Accounting for Nonlinearities in Open-Loop Protocols for Symmetry Fault
           Compensation
    • Authors: DiBerardino LA; III, Dankowicz H.
      Abstract: In this paper, we consider model examples of dynamical systems with only a few degrees of freedom, and with desirable symmetry properties, and explore compensating control strategies for retaining robust symmetric system response even under symmetry-breaking defects. The analysis demonstrates the distinct differences between linear versions of these models, in which fault-compensating strategies are always found, and weakly nonlinear counterparts with varying degrees of asymmetry, for which a multitude of locally optimal solutions may coexist. We further formulate a candidate optimization protocol for fault compensation applied to self-healing systems, which respond to symmetry-breaking defects by a continuous process of fault correction. The analysis shows that such a protocol may exhibit discontinuous changes in the control strategy as the self-healing system successively regains its original symmetry properties. In addition, it is argued that upon return to a symmetric configuration, such a protocol may result in a different control strategy from that applied prior to the occurrence of a fault.
      PubDate: Thu, 12 Sep 2013 00:00:00 GMT
       
  • Three-Dimensional Solid Brick Element Using Slopes in the Absolute Nodal
           Coordinate Formulation
    • Authors: Olshevskiy A; Dmitrochenko O, Kim C.
      Abstract: The present paper contributes to the field of flexible multibody systems dynamics. Two new solid finite elements employing the absolute nodal coordinate formulation are presented. In this formulation, the equations of motion contain a constant mass matrix and a vector of generalized gravity forces, but the vector of elastic forces is highly nonlinear. The proposed solid eight node brick element with 96 degrees of freedom uses translations of nodes and finite slopes as sets of nodal coordinates. The displacement field is interpolated using incomplete cubic polynomials providing the absence of shear locking effect. The use of finite slopes describes the deformed shape of the finite element more exactly and, therefore, minimizes the number of finite elements required for accurate simulations. Accuracy and convergence of the finite element is demonstrated in nonlinear test problems of statics and dynamics.
      PubDate: Thu, 12 Sep 2013 00:00:00 GMT
       
 
 
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