Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (6 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

MACHINERY (34 journals)

Showing 1 - 27 of 27 Journals sorted alphabetically
Acta Mechanica Solida Sinica     Hybrid Journal   (Followers: 8)
Advanced Energy Materials     Hybrid Journal   (Followers: 34)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 26)
CORROSION     Full-text available via subscription   (Followers: 21)
Electric Power Components and Systems     Hybrid Journal   (Followers: 7)
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 9)
International Journal of Machining and Machinability of Materials     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 9)
International Journal of Precision Technology     Hybrid Journal   (Followers: 1)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 3)
International Journal of Rotating Machinery     Open Access   (Followers: 2)
Journal of Machinery Manufacture and Reliability     Hybrid Journal   (Followers: 2)
Journal of Manufacturing and Materials Processing     Open Access  
Journal of Mechanics     Hybrid Journal   (Followers: 9)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 6)
Journal of Terramechanics     Hybrid Journal   (Followers: 5)
Machine Design     Partially Free   (Followers: 215)
Machine Learning and Knowledge Extraction     Open Access   (Followers: 17)
Machines     Open Access   (Followers: 4)
Materials     Open Access   (Followers: 4)
Mechanics Based Design of Structures and Machines: An International Journal     Hybrid Journal   (Followers: 8)
Micromachines     Open Access   (Followers: 2)
Pump Industry Analyst     Full-text available via subscription   (Followers: 1)
Russian Engineering Research     Hybrid Journal  
Sensor Review     Hybrid Journal   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
Similar Journals
Journal Cover
Journal of Mechanics
Journal Prestige (SJR): 0.303
Citation Impact (citeScore): 1
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1727-7191 - ISSN (Online) 1811-8216
Published by Oxford University Press Homepage  [425 journals]
  • Greetings from the new Editor-in-Chief

    • Free pre-print version: Loading...

      Pages: 1 - 1
      PubDate: Mon, 15 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae003
      Issue No: Vol. 40 (2024)
       
  • Injection moulding process parameter and strain rate dependence mechanical
           properties measurement and theoretical estimation of EVA polymer foam

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      Pages: 1 - 9
      Abstract: AbstractIn this study, the combined experimental and theoretical estimation on elastic characteristics of EVA (ethylene-vinyl acetate) copolymer material is demonstrated. Strain rate dependence stress–strain behavior of EVA in raw and foam material form are measured by the quasi static and dynamic compression test. Simultaneously, the influence of different mould temperature and injection pressure on mechanical properties of EVA foam are investigated. According to the usage scenario of EVA foam in sport footwear application, the EVA foam is generally deformed under higher strain rate as compared with the quasi-static compression condition. For this reason, the stress–strain behavior of EVA foam under high strain rates of 2.66 × 10−3 and 2.66 × 10−2 s−1 are estimated. The analytic results revealed that the strain rate slightly enhanced the modulus of EVA foam, and the foregoing strain rate effect is substituting into the classic Young's modulus estimation equation of closed cell cellular solid. Accordingly, the strain rate dependence Young's modulus of EVA foam is successfully estimated by both experiment and theoretical estimation.
      PubDate: Thu, 04 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufad044
      Issue No: Vol. 40 (2024)
       
  • Study on the fastening property of precision locknut under simulated
           dynamic impact loading with consideration of interference factors

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      Pages: 19 - 30
      Abstract: AbstractScrew thread fastening system is the category of mechanical connection utilizing both wedge and friction actions to transfer clamping force and torque. This fastening system shows the advantages of simple in structure and ease in application. However, its shortcomings include the performance limitation by dimension and precision, stress concentration induced by the notch geometry, loosening in dynamical service, susceptible to atmospheric condition, etc. Therefore, the possible interference on the anti-loosening property of the locknut by noise factors of the ambient temperature, operator characteristics, and type of torque wrench used was investigated using Taguchi method in this study beside the main control factors of type of locknut, fit clearance, and type of lubrication grease. The goal was to evaluate the anti-loosening property of the locknut, i.e. the anti-loosening ratio and axial force ratio, in a more realistic manner. The connection joint of the locknut was subjected to cyclic transverse impact and the anti-loosening property was measured after a specified number of cycles. The loading effect on the surface roughness of thread surface was examined and discussed after the test. It was found that the factor of locknut type dominated the influence over the lubrication grease and fit clearance factors. Through the analysis, the design with optimal combination of the control factors improved the axial force ratio and anti-loosening ratio by 7.8% and 47.9%, respectively.
      PubDate: Wed, 03 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae001
      Issue No: Vol. 40 (2024)
       
  • The effect of wind barriers on the local wind field on a bridge deck

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      Pages: 44 - 52
      Abstract: AbstractThe adverse effect of crosswinds on road vehicles on a bridge deck or traffic lanes is of increasing concern. Local flow characteristics depend on the bridge's architecture and wind barriers (WBs) are commonly used to alleviate wind-induced instability for vehicles. Terrain orography is another dominant factor. This study uses a terrain model with a coastal bridge (Chen-Kung Bridge, Penghu, Taiwan). The bridge is located between a reservoir and the Taiwan Strait. Numerous accidents have occurred due to strong monsoon winds in autumn and winter. In wind tunnel experiments, an atmosphere boundary layer is established and the test conditions (wind speed and wind incidence) are taken from local meteorological data. The effect of the height of solid WBs on local wind direction and speed is determined. The results can be used to remodel WBs to increase safety for road vehicles.
      PubDate: Fri, 12 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae002
      Issue No: Vol. 40 (2024)
       
  • A new method of solving plane-strain boundary value problems for the
           double slip and rotation model

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      Pages: 53 - 67
      Abstract: AbstractA method of solving plane-strain boundary value problems for a reduced version of the double slip and rotation model is developed. It is assumed that the intrinsic spin vanishes. Elastic strains are neglected. The Mohr–Coulomb yield criterion is adopted. An analogy between the solutions for this model and classical rigid plastic solutions of pressure-independent plasticity is revealed. The method is based on introducing auxiliary variables that satisfy the equation of telegraphy in regions where both families of characteristics are curved. Therefore, Riemann's method can conveniently be applied to solving boundary value problems. The method is employed for analyzing the processes of plane-strain drawing and extrusion through a wedge-shaped die. Friction is neglected. The solution is given in terms of ordinary integrals. The effect of the angle of internal friction on processes’ parameters is revealed. The solution reduces to available solutions of pressure-independent plasticity if the angle of internal friction vanishes.
      PubDate: Sat, 27 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae004
      Issue No: Vol. 40 (2024)
       
  • Sound absorption mechanism of underwater anechoic coating with spherical
           cavities

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      Pages: 68 - 78
      Abstract: AbstractAn axisymmetric theoretical model is simplified to investigate sound absorption in the underwater anechoic coating with spherical cavities. An empirical equation is put forward to predict the frequency at the first absorption peak. The sound absorption mechanism of viscoelastic solid with cavity is clarified by the power analysis method. The quantitative analysis of viscoelastic power dissipation on sound energy provides a new idea for the structural topology optimization of anechoic coatings. These formulas are given to calculate the dissipation power of viscoelastic solid. The dependence of sound absorption performance of the anechoic coating upon radius and position of single or two spherical cavities of the unit cell is analyzed in detail. The study provides guidance for the design of anechoic coatings with cavities.
      PubDate: Sat, 27 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae009
      Issue No: Vol. 40 (2024)
       
  • Fatigue life and fatigue reliability mechanism of ball bearings

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      Pages: 79 - 94
      Abstract: AbstractAs the main supporting parts of rotating machinery, the fatigue life and fatigue reliability of ball bearings directly affect the accuracy, stability and reliability of equipment. Based on the quasi-static model of bearing and the fatigue life theory, this paper analyzes the effect of the spatial position of rolling element on the mechanical properties and fatigue life of bearing, and studies the action mechanism of bearing working conditions and other parameters. In addition, based on the stress–strength model and the fatigue life model of bearing, the fatigue reliability and sensitivity of bearings are analyzed by means of perturbation method, Edgeworth series and fourth moment technique, and the correctness is verified by the Monte Carlo simulation. Results have important theoretical and practical value, and can provide theoretical support for the research of reliability optimization design, fault mechanism and fault diagnosis method of ball bearings.
      PubDate: Wed, 24 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae006
      Issue No: Vol. 40 (2024)
       
  • Active vibration control of functionally graded material plates integrated
           with piezoelectric layers using new Q9ɤ approach

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      Pages: 95 - 111
      Abstract: AbstractA new efficient approach has been developed to simulate the free vibration, static, dynamic response and active control of functionally graded material (FGM) plates with integrated piezoelectric layers. This approach reinforces the standard first-order shear deformation theory by introducing a novel shear strain fields, alleviating the problem of shear locking, especially in the analysis of thin structures. These new fields accurately predict the shear strain fields, satisfying both compatibility and equilibrium equations while requiring less mesh refinement. Furthermore, this current approach provides higher performance and precision in analysing FGM structures. Additionally, a feedback control system has been implemented using either total piezoelectric layers or partial covering (patch) as actuators and sensors in both static bending control and dynamic vibration control analysis. The present work strengthens the basic techniques for further research in finite element analysis across a broader spectrum of materials and applications.
      PubDate: Thu, 01 Feb 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae005
      Issue No: Vol. 40 (2024)
       
  • Integrated design and fabricate of high sensitivity built-in thin-film
           thermocouple temperature measurement tool

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      Pages: 112 - 122
      Abstract: AbstractCutting temperature is playing a key role in evaluating the cutting process, which significantly affects the tool wear and the quality of the workpiece. Aiming at the problems of low precision, low aging, and poor stability of cutting temperature measurement on the front tool face, an integrated design and production scheme of a high sensitivity built-in wireless temperature measurement tool was proposed. The temperature distribution position on the front tool face was analyzed with 3D finite element simulation software, and the thermal contact position of the main and secondary film thermocouples was determined. SiO2 insulated films and NiCr/NiSi film thermocouples were prepared on the front tool surface by femtosecond laser micromachining, electrolyte-plasma polishing, plasma enhanced chemical vapor deposition and magnetron sputtering, and a static calibration experiment system for sensitivity and accuracy of the temperature measuring tool for the film thermocouple was established, and Seebeck coefficient of the film thermocouple was obtained. According to the actual cutting conditions, the wireless temperature measuring system of the thin film thermocouple tool was built and the field cutting test was carried out to obtain the influence law of different cutting parameters on the cutting temperature, and further verify the feasibility of the thin film temperature measuring sensor. The research results show that: Seebeck coefficients of the two kinds of thermocouples prepared by the NiCr/NiSi thin film thermocouple temperature measuring tool are 34.97 μV/°C and 34.96 μV/°C, and the slope of the temperature data fitting curve is 1.00398 and 0.997475, respectively. The linear correlation coefficient R2 is close to 1, which is close to the standard K-type thermocouple, which shows good sensitivity and accuracy. At the same time, the temperature measurement results are close to the commercial standard K thermocouple, and the error is less than 5%, indicating that the developed film thermocouple has a high measurement accuracy and can meet the needs of temperature measurement. Actual cutting test is carried out with developed wireless temperature measuring device of thin film thermocouple, which shows this device can meet the requirements of tool temperature measurement, and the feasibility of thin film temperature measuring sensor is further verified. The research provide technical reference for industrial intelligent manufacturing in order to realize the wireless measurement of cutting area temperature of tool front.
      PubDate: Sat, 27 Jan 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae008
      Issue No: Vol. 40 (2024)
       
  • CFD simulation analysis of air curtain applications in vulcanization
           machines

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      Pages: 121 - 131
      Abstract: AbstractThis study simulates the vulcanization gas generated during the processing of the vulcanizing machine. During the simulation process, the influence of different angles and flow rates of the gas curtain on its flow field is simulated. Since the rubber has to go through the vulcanization process of the vulcanizer during the manufacturing process, the original liquid rubber is turned into a viscoelastic rubber solid. During the process, toxic and high-temperature vulcanization gas will be generated due to high-temperature hot pressing. If a large amount of this gas is inhaled, it will cause harm to the human body. Therefore, this study uses the CFD software Flow Vision to simulate the opening of the vulcanizing machine, and observes the flow field with different air curtains to find the most suitable air curtain wind speed and angle. Then, make a simple model for actual experiments, using CO2 instead of sulfide gas and installing a CO2 sensor at the nose of the mannequin, using the sensor to observe whether there is excessive CO2 diffused to the mannequin to judge the air curtain. Whether the gas is successfully prevented from spreading to the position where the personnel is located, to facilitate the observation of the gas diffusion, a smoke machine and a ray generator are added so that the gas diffusion status can be observed in real-time. In the end, finding the 9 m/s flow rate and a 90° air curtain angle positioned near the machine can greatly reduce the inhalation of excessive sulfide gas by machine operators and reduce the potential harm to the human body during work.
      PubDate: Mon, 04 Mar 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae010
      Issue No: Vol. 40 (2024)
       
  • Modeling, driving characterization of collision and stick-slip
           vibration-driven system

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      Pages: 132 - 145
      Abstract: AbstractConsidering the internal collision vibration-driven and external discontinuous resistance tolerance fusion conditions, the non-smooth dynamics characteristics of collision and stick-slip vibration-driven system are studied and experimented. Unilateral collision behavior of internal oscillators under the action of a periodic force to achieve system motion in different directions, it overcome the external Coulomb friction force and drives the system to drive in steady state under a certain direction. The kinematic and dynamic models of the system are established, and the collision and stick-slip driving motion of the system is analyzed based on the theory of non-smooth dynamics. The voice coil motor is used as the internal driving element, and the vibration driving test platform is designed and fabricated, and the driving characteristics of the system are studied experimentally. The study shows that there are three forms of movement in the steady state driving motion of the system: sticking motion, forward motion and backward motion; sine wave excitation and triangular wave excitation as input excitation have the characteristic of smoother operation with less shock; external excitation parameter regulation can change the system speed and direction of the movement; excitation frequency as a regulation parameter has the advantages of speed bandwidth, continuity, and so on; the system average driving speed in the numerical simulation and experimental test withthe system average driving speed in numerical simulation and experimental test has the same rule of change, the backward motion is located in the low-frequency region, the forward motion is located in the high-frequency region, the friction coefficient and the excitation amplitude affect the size of driving speed. The results and methods of this study provide a corresponding theoretical basis for the design and parameter optimization of vibration-driven robots.
      PubDate: Wed, 06 Mar 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae007
      Issue No: Vol. 40 (2024)
       
  • Correction to: Fatigue life and fatigue reliability mechanism of ball
           bearings

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      Pages: 146 - 148
      PubDate: Mon, 01 Apr 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae013
      Issue No: Vol. 40 (2024)
       
  • Generalized dynamics equation with causal symmetry

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      Pages: 149 - 154
      Abstract: ABSTRACTThe particle dynamics equation’s formal logic is examined in the context of classical mechanics to investigate the nature of inertial forces. First, a fresh perspective on the dual dependence of the inertial reference frame and inertial force in Newtonian dynamics is presented. The causal relationship between the two sides of Newton’s second law is found to be asymmetrical and inconsistent. Secondly, a more general particle dynamics equation, applicable in any translational frame of reference without additional assumptions, is introduced. Essentially, Newton’s second law is only an extreme case of the newly generalized dynamics equation since in Newton’s second law an entire term of the forces acting on the reference object is omitted. The nature of inertial force is unveiled as the mass-ratio weighted real force acting on the reference object. This qualitative explanation is entirely naturalistic as the reference frame’s acceleration depends directly on the acceleration of its reference object(s), and the acceleration of every reference object depends directly on the forces acting on this reference object.
      PubDate: Fri, 15 Mar 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae012
      Issue No: Vol. 40 (2024)
       
  • Dynamic engraving characteristics of nylon belt under different charge
           conditions

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      Pages: 155 - 163
      Abstract: AbstractIn the present study, a 105 mm short tube gun system was designed to conduct the firing experiments under low charge conditions, which could precisely obtain the projectile displacement data and projectile base pressure data during the engraving process. Besides, a 3-dimensional dynamic engraving FEM-SPH model was established by coupling the internal ballistic process to much authentic investigate the engraving characteristics of the projectile, which were verified and compared through the experiment. On this premise, the influence mechanism and engraving features of the nylon belt were numerically calculated under higher charge conditions. The comparison between the experimental recovery belt and the numerical calculation results shows that the damage to the front of the nylon belt is axial compression wear, while the damage to the back of the nylon belt is circumferential shear wear. The direction of force exerted by the slope chamber and the projectile body on the belt was inconsistent, causing a bulge in the middle of the nylon belt. The more rapid the average boosting rate, the stronger the instantaneous impact on the nylon belt, the larger the stress and the strain damage on the nylon belt, the higher the pressure at the end of the engraving process and the greater the maximum engraving resistance. When the average boosting rate increased from 2.7 MPa⋅ms−1 to 33.0 MPa⋅ms−1, the engraving time was shortened by 73.9%, while the maximum engraving resistance increased by 78.2%.
      PubDate: Sat, 27 Apr 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae016
      Issue No: Vol. 40 (2024)
       
  • Determination of nonlocal kernels in nonlocal models for solving strain
           localization problems

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      Pages: 164 - 177
      Abstract: ABSTRACTThe strain localization during the damage and failure of materials can be accurately predicted by nonlocal continuum theories. Yet, the results of theoretical predictions are directly affected by the nonlocal kernel formulation. In this study, the correlation between the nonlocal kernel formulation and the strain localization simulation results is revealed. First, based on the nonlocal damage theory, a novel free energy functional was proposed with strain and damage parameters as independent variables, and a constitutive relation considering nonlocality and elastic damage was derived within the framework of continuum thermodynamics. Then, one-dimensional governing equations were obtained through the dual-linearization method. Finally, strain localization predictions obtained with several nonlocal kernel formulations were presented, and the relationship between the nonlocal kernels and the solution was analyzed, thereby determining an appropriate nonlocal kernel function for the strain localization problem.
      PubDate: Tue, 16 Apr 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae017
      Issue No: Vol. 40 (2024)
       
  • Monitoring the crack lengths in composite lap joints under cyclic loading

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      Pages: 178 - 184
      Abstract: ABSTRACTMonitoring crack lengths in composites lap joints is crucial for the evaluation of safety and integrity in composite structures. The crack lengths in adhesively bonded single-lap and double-strap joints were characterized by using epoxy adhesive containing aligned graphene. The epoxy adhesive was prepared by adding graphene to epoxy resin and then aligning the graphene through an electrical field. The incorporation of 0.15 wt% aligned graphene can have the epoxy adhesive being electrically conductive. The single-lap and double-strap joints containing the graphene epoxy adhesive were tested under cyclic loading. During the cyclic tests, the crack extension and electrical resistance were measured concurrently. In addition, the electrical resistance model expressed in terms of the crack lengths for the lap joints was proposed in the examination. The results illustrated that the crack length and the electrical resistance increased as the cyclic number increased. Moreover, the experimental resistance variation associated with the increased crack length can be described using the electrical resistance model. Thus, the functionalized epoxy adhesive containing aligned graphene can be employed for effectively detecting the length of cracks in composite lap joints under cyclic loading.
      PubDate: Sat, 27 Apr 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae018
      Issue No: Vol. 40 (2024)
       
  • Behavior of an aerodynamic sliding bearing with textured surface under
           turbulent conditions

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      Pages: 185 - 202
      Abstract: AbstractRecent advancements in turbomachinery development aim to reduce components while improving performance and minimizing environmental impact. Aerodynamic bearings, supporting high-speed rotors by dissipating significant energies, are key elements requiring thorough understanding. In order to better predict the behavior of aerodynamic bearings operating under severe conditions, numerical models using computational fluid dynamics have been employed to study the thermal effect on the tribological behavior of these air-lubricated bearings. An analysis of surface texturing of the bearings has also been conducted to evaluate its influence on operational performance compared to non-textured surfaces, considering the influence of rotation speed, radial load, and textures on the tribological performance of plain bearings. The main results observed are as follows. First, there is a noticeable change in geometric characteristics, such as the application of micro-textures, lubrication and friction, compared with conventional plain bearings. This textured surface appears to have a significant influence on the pressure and velocity distribution of the lubricating fluid, leading to significant changes in the bearing's tribological and operational performance. In addition, numerical analysis also reveals significant variations in shear stresses in the vicinity of the bearing walls. These variations can potentially affect the strength and durability of the bearing under severe operating conditions. Additionally, the results show a downward trend in system temperature, suggesting improved thermal management thanks to the textured surface. Another essential aspect revealed by this analysis is the decrease in the coefficient of friction with increasing shaft speed. This observation underlines the importance of operating speed and applied radial load in the bearing's tribological behavior and suggests further optimization possibilities for reducing energy losses and extending the life of the aerodynamic sliding bearing.
      PubDate: Mon, 15 Apr 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae015
      Issue No: Vol. 40 (2024)
       
  • Enhancing buoy-based swinging energy harvesters through bat algorithm
           optimization: a comprehensive study

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      Pages: 203 - 222
      Abstract: AbstractDue to the threat of greenhouse gas emissions on Earth's sustainability, low carbon with green energy is crucial. Ocean hydropower is inexhaustible, with wave energy being a feasible green energy source. Previous low-frequency domain wave energy capture mainly used linear piston-type electromagnetic induction generators. However, this method produced weak electrical energy. To address this, a novel wave power generation method is proposed. It involves setting up a raft-like float, which is pushed by waves. A spring and damping assembly for buffering is added between the float and a vertical rod. The spring and damping assembly connect to a rod element online, and through a rod and gear mechanism, convert the float's linear motion into oscillatory motion to drive a generator. A raft-style float for sufficient buoyancy and a rod and gear mechanism to convert linear motion into rotational motion, driving a generator is adopted to produce more significant electrical energy. This study adopts a Lagrangian energy method and complex variable functions to deal with a double-mass dynamic system. Additionally, using a surface sinusoidal wave with amplitude of 0.3 m and a frequency of 2 rad/s as an example, the study combines bat algorithms to optimize the energy harvester for maximum power generation. Consequently, simulations demonstrate a maximal electrical power output of 4470 watts. The applied force and moment on the gear to induce electrical power measure 19 000 N and 5700 N-m, respectively.
      PubDate: Tue, 14 May 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae020
      Issue No: Vol. 40 (2024)
       
  • Using the discontinuous bi-viscosity model to analyze the
           three-dimensional flow field and local scour behavior around Claviaster
           libycus (Echinodermata, Echinoidea)

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      Pages: 223 - 238
      Abstract: ABSTRACTPrevious studies have suggested that irregular echinoids exhibit higher survival rates than regular echinoids following mass extinctions. This study focuses on the irregular echinoid Claviaster libycus, investigating its flow field and scour behavior under extreme water flow conditions through numerical simulations and experiments. The numerical model Splash3D used in this study was modified from the open-source code Truchas developed by the US National Laboratory. Splash3D solves the three-dimensional incompressible Navier–Stokes equations. The fluid volume method describes the water surface kinematics and sand surface kinematics. Since C. libycus is semi-submerged in the sand, a discontinuous bi-viscosity model describes the rheological behavior of the bed material. The research findings indicate that when the gonopore of C. libycus faces downstream, there is no evident horseshoe vortex flow, which contributes to reducing the occurrence of localized scour. This also validates the hypothesis of this study: the transition of echinoids from pentaradial symmetry to bilateral symmetry assists in stabilizing bottom sediments and reducing localized scour.
      PubDate: Wed, 22 May 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae019
      Issue No: Vol. 40 (2024)
       
  • Investigation on the vibration characteristics of rock based on circular
           plate and cylinder models: dimension, geometric shape and boundary
           condition

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      Pages: 239 - 250
      Abstract: AbstractThe declaration on the “natural frequency of rock” exists in many engineering areas, and it has caused many misunderstandings. Different from the mass-spring model usually used, the circular plate and cylinder models are respectively established to clarify the relationship between the vibration characteristics (including the natural frequency and vibration mode) and their influencing factors of rock by modal analysis. The effect of the dimension, geometric shape and boundary condition on the vibration characteristics of rock with plate structure is investigated, in which the semi-analytical solutions agree well with the simulation results. By using the cylinder model based upon the Lamé–Navier equation, the effect of such influencing factors on the vibration characteristics of the block rock sample is further studied and verified by numerical simulation and experimental results. The results suggest that the natural frequency of “rock” (including the experimental rock sample) is strongly dependent on the dimension, geometric shape and boundary condition. The resonance frequency observed in the excitation experiment is not only closely associated with the natural frequency of a specific order but also dependent on the dominance of the particular vibration mode. These findings contribute to a better understanding of the rock-breaking mechanism under dynamic loads with a certain excitation frequency.
      PubDate: Thu, 23 May 2024 00:00:00 GMT
      DOI: 10.1093/jom/ufae021
      Issue No: Vol. 40 (2024)
       
 
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  Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)
    - CERAMICS, GLASS AND POTTERY (31 journals)
    - MACHINERY (34 journals)
    - MANUFACTURING AND TECHNOLOGY (223 journals)
    - METROLOGY AND STANDARDIZATION (6 journals)
    - PACKAGING (19 journals)
    - PAINTS AND PROTECTIVE COATINGS (4 journals)
    - PLASTICS (42 journals)
    - RUBBER (4 journals)

MACHINERY (34 journals)

Showing 1 - 27 of 27 Journals sorted alphabetically
Acta Mechanica Solida Sinica     Hybrid Journal   (Followers: 8)
Advanced Energy Materials     Hybrid Journal   (Followers: 34)
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 26)
CORROSION     Full-text available via subscription   (Followers: 21)
Electric Power Components and Systems     Hybrid Journal   (Followers: 7)
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 9)
International Journal of Machining and Machinability of Materials     Hybrid Journal   (Followers: 5)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 9)
International Journal of Precision Technology     Hybrid Journal   (Followers: 1)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 3)
International Journal of Rotating Machinery     Open Access   (Followers: 2)
Journal of Machinery Manufacture and Reliability     Hybrid Journal   (Followers: 2)
Journal of Manufacturing and Materials Processing     Open Access  
Journal of Mechanics     Hybrid Journal   (Followers: 9)
Journal of Strain Analysis for Engineering Design     Hybrid Journal   (Followers: 6)
Journal of Terramechanics     Hybrid Journal   (Followers: 5)
Machine Design     Partially Free   (Followers: 215)
Machine Learning and Knowledge Extraction     Open Access   (Followers: 17)
Machines     Open Access   (Followers: 4)
Materials     Open Access   (Followers: 4)
Mechanics Based Design of Structures and Machines: An International Journal     Hybrid Journal   (Followers: 8)
Micromachines     Open Access   (Followers: 2)
Pump Industry Analyst     Full-text available via subscription   (Followers: 1)
Russian Engineering Research     Hybrid Journal  
Sensor Review     Hybrid Journal   (Followers: 2)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
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