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Phononic crystals exhibit unique dynamic characteristics that make them act as tunable mechanical filters for elastic or acoustic wave propagation. The introducing of the idea of PCs in engineering structures provides a new technique for the control of vibration and noise. In this paper, basing on the Mindlin plate theory, the Timoshenko beam theory and the Bloch theorem, an efficient finite element...
This paper presents a modal analysis method of the base of welding robot by using the finite element analysis software ANSYS release10.0. The base suffers large dynamic stress as shock and vibration while welding robot works, which on the one hand lead to lower precision of welding, on the other hand, may cause the base damaged. Thus dynamic analysis is necessary for design of the base of welding...
Optimization of structures with constrained layer damping by bi-directional evolutionary structural optimization???BESO???was studied in this paper. The sensitivity equation of the objective function about deleted and added elements was built for maximization of modal loss factor of constrained layer damping structure. Firstly the FEA model of the metal structure without constrained layer damping...
Honeycomb paperboard has developed rapidly because of its hexagon core structure in casing area. One of the reasons is that honeycomb paper can prevent or lighten the vibration and concussion in the process of transportation. Existent anomalistic hexagon structure of the honeycomb paperboard has an impact on its antivibration characteristics. The antivibration effect of different anomalistic honeycomb...
In this work, piezoelectric ultrasonic motors are designed based on the Functionally Graded Material (FGM) concept by using topology optimization. FGMs are composite advanced materials, which are made by changing gradually the properties with position inside material domain. The FGM concept applied to piezoelectric structures allows modifying their dynamic characteristics. In this work, Functionally...
This paper presents a test rig designed at the University of Cape Town to evaluate the performance of a high speed electromechanical flywheel for energy storage. The electromechanical flywheel is specifically designed to enhance rural electrification through improving the energy storage component in solar home systems. A safe, flexible and low vibration test rig has been designed. Modal analysis using...
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