The generalized Fourier-series method was used to derive the impact responses formula of an unrestrained planar frame structure when subjected to an impact of a moving rigid-body.By using these formula,the analytic solutions of dynamic responses of the contact-impact system can be obtained.During the derivation,the momentum sum of elastic responses of the contact-impact system is demonstrated to be zero.From the derivation,it is seen that the modal method can also be used to solve this kind of impact problem.
Huang T C.The effect of rotary inertia and of shear deformation on the frequency and normal mode equations of uniform beams with simple end conditions[J].Journal of Applied Mechanics,1961,28(4):579—584. doi: 10.1115/1.3641787
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克拉夫 R W,彭津 J.结构动力学[M].王光远等 译.北京:科学出版社,1981,204—216.