基于灵敏度分析的机械结构动力学修改

DYNAMIC MODIFICATION BASED ON DESIGN SENSITIVITY ANALYSIS IN MECHANICAL STRUCTURE

详细介绍了机械结构模态灵敏的理论并据此方法扩展建立了简谐激励下结构稳态动力响应灵敏度的公式 ,指出周期激励可展开成Fourier级数同样适合该理论 ,为结构的动力修改提供了理论依据 ,最后在MATLAM5 2平台上通过一实例编程计算加以说明。

Design sensitivity analysis,i.e.calculation of derivation modal frequency(eigenvalue) and mode shapes(eigenvectors) with respect to design parameters is introduced in detail in this paper,the structural long term response sensitivity theory with a harmonic input is set up which is also suitable for the periodic inputs because it can be expanded in Fourier series and the dynamic modification of the system can be easily realized with the help of the theories mentioned above.Finally,the paper presents an example to calculate the corresponding sensitivity with programming in MATLAB 5.2 to prove the importance of it in the application of dynamic modification.