three axis serial robots with different sizes are widely used for pick and place, welding and various operations in industry. Developments in mechatronics, which is the synergistic integration of mechanism, electronic...
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ISBN:
(纸本)9780791849170
three axis serial robots with different sizes are widely used for pick and place, welding and various operations in industry. Developments in mechatronics, which is the synergistic integration of mechanism, electronics and computer control to achieve a functional system, offer effective solutions for the design of such robots. the mechatronic design process involves solid modeling, assembly, rigid body dynamics, finite element rigidity analysis, motion control and computer programming. In this study, Solid Works, Cosmos Motion, Cosmos Works and PC-based motion control programs are used with an integrated approach. the integration software is developed in VisualBASIC by using the application programming interface (API) capabilities of these programs. An experimental three axis serial robot with a reach distance of 790 mm has been produced to develop and test the process.
A method for singularity reduction in a triangular 3-UPS mechanism is discussed. this mechanism usually has singularity near the origin. Changing the active joint angle can arrive at a suitable workspace near the orig...
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ISBN:
(纸本)9780791849170
A method for singularity reduction in a triangular 3-UPS mechanism is discussed. this mechanism usually has singularity near the origin. Changing the active joint angle can arrive at a suitable workspace near the origin without any singularity. Moreover, a 4-UPS mechanism, based on adding one additional leg to the 3-UPS mechanism, has a larger singular free workspace. Moreover, force analysis of two different mechanisms shows a reasonable and consistent force distribution between the different actuators. Singular free workspace is one of the characteristics which makes this mechanism ideal for haptic applications.
A numerical model, based on dynamic mesh, has been developed by FLUENT software, to simulate behavior of a positive displacement compressor. Only first compression stage of compressor was modeled. Modeling was done, b...
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ISBN:
(纸本)9780791849156
A numerical model, based on dynamic mesh, has been developed by FLUENT software, to simulate behavior of a positive displacement compressor. Only first compression stage of compressor was modeled. Modeling was done, by dividing the domain to three areas with different type meshes. Some relations were presented for volumetric, mechanical, isothermal, and overall isothermal performance, and thermodynamic analysis has been performed in term of these relations. Effects of outlet pressure and crankshaft's angular velocity have been investigated on work, polytropic factor of compression, and efficiency. Numerical and experimental results have been compared, and a good agreement was seen between them.
Ground vibrations generated by high-speed trains are studied in this paper. Open trenches are included in modeling and the problem is formulated using elasticity theory. the ground is modeled by a semi-infinite domain...
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ISBN:
(纸本)9780791849194
Ground vibrations generated by high-speed trains are studied in this paper. Open trenches are included in modeling and the problem is formulated using elasticity theory. the ground is modeled by a semi-infinite domain and the embankment with finite layers and the high-speed train is simulated by moving loads. the analytical solution is obtained in frequency domain and the peak particle velocity (PPT) is then achieved for different types of open trenches with different aspect ratios and distance from the track centerline. A parametric study is then carried out and effects of different parameters including the train speed and ground properties on vibration reduction factors are investigated.
Beams in engineering structures are mainly jointed together by welding. In general, they are imposed to static and dynamic loads. thus, analyses of welds are very important to study their behaviours. In this study fin...
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ISBN:
(纸本)9780791849187
Beams in engineering structures are mainly jointed together by welding. In general, they are imposed to static and dynamic loads. thus, analyses of welds are very important to study their behaviours. In this study finite element analyses of welds in the cantilever box beams are performed using the ANSYS program. Two different types of weld are considered;full penetration welds and fillet welds. Stress distributions in different paths are calculated for both types. It is shown that using of full penetration welds in a structure leads to safer welds than using of fillet welds. In addition, effects of different parameters such as fillet weld leg, weld material, thickness of cantilever box beam, and amount of its penetration in beam are studied.
there is a growing interest in the use of thin-wall structures as a means of absorbing the kinetic energy of a moving body. Multi-layered thin-wall structures are more efficient and lighter than thick-wall structures,...
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ISBN:
(纸本)9780791849170
there is a growing interest in the use of thin-wall structures as a means of absorbing the kinetic energy of a moving body. Multi-layered thin-wall structures are more efficient and lighter than thick-wall structures, and show better crashworthiness characteristics. In this task, several concentric aluminum thin wall tubes as energy absorber under axial and oblique loading are studied and optimum combination of these tubes is presented. the weight of the tubes is optimized while crashworthiness of tubes is not compromised. the commercial finite element program LS-DYNA that offers non-linear dynamic simulation capabilities was used in this study.
Whiplash injury/disorder is a common neck-injury in road traffic accidents. this paper introduces energy absorbing car-seat concepts which can reduce the risk of whiplash injuries. Computational multi-body models of a...
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ISBN:
(纸本)9780791849170
Whiplash injury/disorder is a common neck-injury in road traffic accidents. this paper introduces energy absorbing car-seat concepts which can reduce the risk of whiplash injuries. Computational multi-body models of a generic car seat and a biofidelic 50th-percentile male human model for rear impact are developed to assess the effectiveness of the proposed car-seat concepts. the numerical sled-test-simulations show that the proposed car-seat concepts can successfully mitigate whiplash injuries for a wide range of crash severity by utilising energy absorbing devices which can remain reusable after a rear-impact. A physical model of a proposed car-seat concept is built and tested to verift the computational models.
Engine mount vibration level, which is mainly driven by gas and unbalanced inertial forces, is one of the key metrics for the NVH (Noise Vibration Harshness) performance of a vehicle. In addition to gas and unbalanced...
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ISBN:
(纸本)9780791849170
Engine mount vibration level, which is mainly driven by gas and unbalanced inertial forces, is one of the key metrics for the NVH (Noise Vibration Harshness) performance of a vehicle. In addition to gas and unbalanced inertial forces, crankshaft dynamics has also effect on engine mount vibrations. this project is concentrating in including the effect of crankshaft dynamics on engine mount vibrations withthe aid of Finite Element Methods and Multi Body Dynamics. Flywheel swirl mode, its effect on engine mount vibration levels and engine mount acceleration for different flywheel configurations will be simulated.
this paper describes the design and testing of a low cost thermoacoustic generator. A travelling-wave thermoacoustic engine with a configuration of a looped-tube resonator is designed and constructed to convert heat t...
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ISBN:
(纸本)9780791849156
this paper describes the design and testing of a low cost thermoacoustic generator. A travelling-wave thermoacoustic engine with a configuration of a looped-tube resonator is designed and constructed to convert heat to acoustic power. A commercially available, low-cost loudspeaker is adopted as the alternator to convert the engine's acoustic power to electricity. the whole system is designed using linear thermoacoustic theory. the optimization of different parts of the thermoacoustic generator, as well as the matching between the thermoacoustic engine and the alternator are discussed in detail. A detailed comparison between the preliminary test results and linear thermoacoustic predictions is provided.
Nowadays researchers focused their attention on design for manufacturing, design for assembly, design for cost or design for quality design for X, etc., but they didn't address design for manufacturing complexity....
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ISBN:
(纸本)9780791849187
Nowadays researchers focused their attention on design for manufacturing, design for assembly, design for cost or design for quality design for X, etc., but they didn't address design for manufacturing complexity. design for complexity is a systemic approach that simultaneously considers design objectives (i.e., optimize complexity level)), variables and constraints. In this paper, a guideline is presented to show the design requirements. Based on this requirement, the complexity levels will be analyzed through four fundamental levels: design for manufacturing systems vision complexity, design for manufacturing systems structure, design for manufacturing systems operating complexity, and design for manufacturing systems evaluating complexity. the new measuring is suggested for determining the level of complexity. this complexity level is measured and optimized in terms of issues count based on the designer/analyst view. this will represent the degree of freedom of manufacturing system designer to identify which issue is more important than others. the ultimate goal of this paper is to provide the manufacturing system designer with such complexity information throughout the analysis process that an efficient design requirement produces in the first instance. this analysis shows that the design for manufacturing systems complexity should be optimized and taken into considerations when designing manufacturing systems.
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