梁板耦合建模中连接负载对系统功率流特性影响研究

STUDY ON EFFECTS OF CONNECTING LOAD ON CHARACTER OF POWER FLOW AMONG COUPLED SYSTEM IN BEAM-PLATE COUPLED SYSTEM MODELING

为了能够更准确预报梁、板耦合系统的功率流特性,在功率流模型解耦过程中引入梁、板连接负载,分析了输入梁、板的功率流,与有限元的分析结果对比,验证了含有连接负载的耦合模型的正确性,从而表明功率流的耦合建模中需要引入连接负载。通过改变结构参数、边界刚度,研究了忽略耦合模型连接负载引起功率流特性分析的误差规律,数值仿真结果表明:随着梁板长度比增大,结构边界刚度的减小,忽略连接负载造成的功率流分析结果误差增大,此时在梁板耦合建模中必须考虑连接负载;梁与板厚度接近时,考虑与不考虑连接负载的仿真数值相近,为了方便计算,可以在建模中忽略连接负载。

To improve the precision of power flow analysis in beam-plate system, the connection load between beam and plate is introduced in the process of decoupling of power flow model to analyze character of power flow in coupled system. The results are compared with those from Finite Element Method, which prove that the model considering connection load is more accurate. It also demonstrates that the connection load have to be included in coupling model. Researches on effects of structure parameters on difference between results from model considering and neglecting load are carried out to obtain an error principle of power flow analysis in coupling system. The simulation results show that the discrepancy between results from models with and without considering load becomes larger with decreasing of the boundary stiffness and increasing of the length ratio between beam and plate, which means that the need of introducing connection load grows up in this situation. When the thickness of plate is close to that of beam, the outcomes form models with and without consideration of load model are similar. For convenience in calculation, it is not necessary to take the connection load into account.