摘要
在结构的初期设计阶段,为了预测结构在随机振动激励下的响应,提出用结构在随机振动过程中的最大响应加速度作为准静态载荷计算结构应力响应的工程分析方法。给出Miles公式法、全频段PSD(power spectral density)法和半功率带宽法三种估算结构随机振动激励下最大响应加速度的方法,并用这三种方法对某相机主镜组件进行随机振动条件下的应力仿真计算。对比计算结果与试验数据,表明用Miles公式法和全频段PSD法仿真计算的误差较小,分别在13%和15%以内。说明用静强度理论考查结构随机振动响应的工程分析方法具有一定的应用价值。
In order to predict the stress response of structures subjected to broadband random vibration at preliminary design stage,an engineering method was brought up.This method applied the concept of static structural strength to evaluate the stress response of structures under random vibration conditions.The maximum response acceleration of the structures was used as quasi-static load.Miles＇ equation,PSD（power spectral density） integration over full bandwidth and half power bandwidth methods were presented to evaluate the maximum response acceleration of structures under random vibration conditions.The stress response of a primary mirror assembly subjected to random vibration was investigated by these methods,and then it was measured through the experiment.The relative errors of the analysis results obtained by Miles＇ equation and PSD integration over full bandwidth are less than 13% and 15% respectively.It is indicated that the engineering method based on static strength theory for random vibration response prediction is applicable.
出处
《机械强度》
CAS
CSCD
北大核心
2012年第1期31-36,共6页
Journal of Mechanical Strength
关键词
随机振动
准静态载荷
应力响应
有限元
Random vibration
Quasi-static load
Stress response
Finite element
