随机振动系统构件应力谱密度的计算  

Computation of Stress Power Density Spectra of Components in a Random Vibration System

作　　者：潘无名[1] 杨明举[2] 徐扬[1] 

机构地区：[1]西南交通大学应用数学系,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2003年第1期12-16,共5页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金项目(60074014)

摘　　要：分析了求解一般系统应力谱的过程,在应力谱计算中提出了单位应力矩阵的概念,解决了由系统随机响应计算应力功率谱密度的问题,并讨论其在一般情况下的存在性.最后用一个算例说明文中提出方法的有效性.The key to analyzing the fatigue life of a random vibration system is to determine its stress power density spectra (SPDS) at the fatigable position of load bearing components. A method called unit stress matrix method is proposed in this paper to calculate the SPDS of nonselfvibration components in a random vibration system. The existence of the unit stress matrix is discussed. An example is presented to show the effectiveness of the proposed method and the procedure of calculation.

关 键 词：随机振动系统 构件 应力谱 功率谱密度 单位应力矩阵 疲劳强度 有限元计算 

分 类 号：O324[理学—一般力学与力学基础]