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Dynamic property analysis-oriented PCB equivalent modeling method

Liu Xiaobao1,Du Ping'an1,John H.L.Ha2,Hu Tao1(1 University of Electronic Science and Technology of China,Chengdu 611731,China;2 Karrie Technologies Company Limited,Dongguan 523709,China)  
Finite element method is a common method for PCB structure dynamic analysis,but the modeling of PCB is often very difficulty due to the complexity of PCB structure,so an equivalent PCB modeling method for dynamic property analysis is presented.In the method,the equivalent dimension is obtained from the main dimension of original PCB,the equivalent density is calculated according to the principle of mass equality,and the equivalent stiffness formula is derived based on vibration theory and finite element method.Additionally,the influences of the size,location and layout of the parts on equivalent stiffness are studied.In the end,an example of the PCB in a server chassis shows that this method is a good and effective way and applicable in engineering projects.
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