摘要
用等效线性化法将受演变随机激励的非线性多自由度Ｄｕｆｆｉｎｇ系统等效为线性时变系统，用虚拟激励法来求解该时变系统的非平稳响应。具有计算简单、精确、效率高的特点。该演变随机激励的谱密度不局限于白噪声和过滤白噪声，各激励之间可以存在相位差。该方法的计算精度由Ｍｏｎｔｅ－Ｃａｒｌｏ法得以验证。
A non-linear MDOF Duffing system is converted into a time-dependent linear systemusing the equivalent linearization technique (ELT). The pseudo excitation method (PEM) isadopted to calculate the non-stationary responses of the time-dependent linear system. The methodhas been shown to be simple, reliable and highly efficient. It is observed that the PSDs of theevolutionary random excitations are not limited to white noise or filtered white noise, and phaselags may exist between excitations.The results of this combined method agree well with the results from Monte-Carlo simulations
出处
《工程力学》
EI
CSCD
北大核心
1999年第6期7-13,61,共8页
Engineering Mechanics
基金
国家自然科学基金!19772009
