Random Vibration Analysis Of Nonlinearity Stuctures With Uncertain Parameters

The exploration of nonlinear random vibration with random parameters has engineering background and great academic value, and it is of theoretical significance as well. Targeting on this topic, this article conducts a thorough research and achieved certain results. Give thought to uncertain material and geometric properties, this article makes an analysis of the response of geometrically nonlinear structure under the wind excitations based on the time domain. Combing Monte-Carlo digital simulation and FEM, calculation of response conducted, adopts the method of subsection precise integration. The wind excitation, which is a random process, is stimulated by adopting FFT, the excitation value of each time node is gained, structure is processed to linear on each period of time, and the change of the mean and standard deviation of responses is gained. Taking all the distributing style and variability of random parameters into consideration, the author analyzes the influence of the randomicity of structure parameters on response through the relevance between the two. This shows us that it is absolutely necessary to take the randomicity of parameters into consideration while analyzing the random vibration response of structure.