含阻尼多裂纹Euler-Bernoulli曲梁强迫振动的Green函数解1)
GREEN'S FUNCTION FOR FORCED VIBRATION OF MULTI-CRACKED EULER-BERNOULLI CURVED BEAM WITH DAMPING^1)
-
摘要: 本文运用Green函数法求解了多裂纹Euler-Bernoulli曲梁(Euler-Bernoulli curved beam, ECB)强迫振动下的解析解,并且考虑了阻尼效应。采用分离变量法、Laplace变换法和矩阵传递法得到了两端简支的多裂纹Euler-Bernoulli曲梁的Green函数解。通过研究表明,将半径R设置为无穷大,可以简化为Euler-Bernoulli直梁(Euler-Bernoulli beam, EB)振动模型。数值计算中,通过与已有文献中的解析解做对比,验证了解的有效性,而且进一步分析了几何物理参数对振动响应的影响以及裂纹之间的相互作用。Abstract: This paper derives analytical solutions of the steady-state forced vibration of the multi-cracked Euler-Bernoulli curved beam (ECB) with damping effects by means of Green's functions. Separate variable method, Laplace transform method and matrix transfer method are successively used to obtain the Green's functions for the ECB equation. The results show that the curved beam can be approximated by the straight beam by setting the radius to infinity. The present analytical solutions are verified by comparing the numerical calculations of the present solution and those available in the literature. The effects of geometric and physical parameters on the vibration response and the interaction between cracks are investigated also.