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Research on Reduction Similarity Simulation Method of Complex System and Its Application

Author: WangQianJin
Tutor: WangAiLun
School: Central South University
Course: Mechanical Engineering
Keywords: complex system dynamic characteristic’similarity similitudetheory and method model reduction method element’ activity modeltest
CLC: N941.4
Type: Master's thesis
Year: 2013
Downloads: 21
Quote: 0
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Abstract


In the similar simulation studies and model test of complex electromechanical system, it usually appears a range of difficulties both in theory and technique. In order to solve this issue, the systemic research on similitude theory and method of complex electromechanical dynamic is presented based on model reduction. The main methods, thought and research results read as follows:(1)The model reduction method was firstly introduced to research on similarity simulation of complex systems, an improved dynamic model-reduction method is proposed based on characteristic equations so that the reduction model is more precise, and the method is applied to research on similitude simulation of complex stiff systems, the similarity criteria between the non-stiff scale model and the prototype is established by differential equation method.(2)Analyzing element’ activity of complex electromechanical system based on bond-graph. The effect of element’ activity on dynamics is studied, the analysis results show:the lower element activity is, the smaller the influence of element on the behavior of the system will be, and based on this, a physical model reduction method is proposed.(3) Based on elements’ activity, a new method of establishing similar model of complex electromechanical system is proposed. Because that the lower element activity is, the smaller the influence of element on the behavior of the system will be, therefore, the similitude law of low activity elements are secondary, so when establishing scale models, the dynamics of model and prototype are still completely similar even if low activity elements of scale model are not similar with prototype.(4) The research on similarity simulation of a typical complex system-gas turbine rotor is presented by using the method of element’ activity, the completely similar model and the scale model with low activity elements not similar to prototype of rotor system are established, and the similarity analysis and model test are studied. The results show there is the same dynamic characteristics between the completely similar model and the scale model established by the new advanced method. The method provides an easy and effective solution for the similarity analysis and model test of complex electromechanical systems.50Figures,14Tables,92References.

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CLC: > SCIENCE AND > Journal of Systems Science > Systems,modern systems theory > Large scale system theory
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