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Thermoelastoplastic Deformation Analysis of electromechanical equipments under Electrocaloric Shock

Journal of Donghua University(English Edition) 2006年第1期23卷 42-48页

作者：于建国吕晨亮叶庆泰 640th Institute School of Mechanical Engineering Shanghai Jiaotong UniversityShanghai 200030

A coupled thermomechanical model is presented to investigate the thermoelastoplastic deformation mechanism of electromechanical equipments under the condition of electrocaloric shock. In the coupling model, differentiating from the previous analyzing viewpoint that looked upon deformation work as additional heat source, temperature-field equation is established by considering the weakening role of deformation work on the intensity of internal heat source; in the process of setting up displacement-field equation, G-derivative of nonlinear functional is introduced into the traditional theory of elastoplastic finite deformation to simplify the expression of structural stiffness; stress-field equation is constructed by using the least square method to improve the stress solution obtained by constitutive equation. The presented model is converted into finite element program to simulate deforming process of 3-D structures with temperature-dependent material properties. As an example, thermal deformation analysis of Shanghai metro cars’ brake resistor is performed and compared with experimental results for illustrating the validity of the presented model.

关键词： electromechanical equipments electro caloric shock thermomechanical coupling finite element analysis.

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THE RESEARCH ON MAINTENANCE STRATEGY OF LECTROMECHANICAL equipments AND PARTS

THE RESEARCH ON MAINTENANCE STRATEGY OF LECTROMECHANICAL EQU...

引用

2005年中国机械工程学会年会

作者： ZHENG Yanbo, ZHAO Xiaoshun, CHEN Huilian, LIU Shuxia (College of Mechanical and Electrical Engineering, Agricultural University of Hebei, Baoding, 071001)

＜正＞With the development of modern science and technology, most electromechanical equipments gather advanced technology to an organic whole, such as machinery, electron, hydraulic pressure, information technology and so on. Their complexity is far greater than the traditional machinery equipment, so higher demands on equipments maintenance should be put forward. In addition, the proportion of the maintenance cost is the largest in LCC （Life Cycle Cost） of electromechanical equipments, and increases little by little every year. So it is not suitable to economic demand to maintain the whole machinery equipment or the parts separately, therefore, in order to obtain the optimum maintenance effect, we should seek a kind of more excellent method, which can combine the above-mentioned two aspects. In this paper, with the optimizing theory, the author puts forward the whole equipments maintenance tactics, meanwhile the maintenance model of parts is set up. All parts of the whole equipment are arranged in an order through using the fuzzy decision theory in Fuzzy Mathematics, at the same time, the order of change of parts is provided, so that make the maintenance of the whole equipment and parts more economical and settle for the request of the technology. It is a kind of more economical and more practical maintenance tactic, and can obtain the optimum maintenance effect.

关键词： electromechanical equipments optimum theory fuzzy decision maintenance

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