摘要
研究了由飞机尾部简化而成的二自由度结构的受迫振动的非线性响应。由于对复杂的运动方程不作进一步简化,方程中含有强非线性耦合部分;采用递归迭代的数字滤波技术对确定性激励的响应进行了计算,结果表明非线性耦合部分,即使在简谐激励下对响应亦有重大影响。本文的研究和进一步考虑系统受非稳态随机激励的响应计算,为计算多自由度非线性结构受迫振动的响应提供了有用的思想和方法。
The nonlinear responses of a forced TDOF structure are inves- tigated.There are some highly nonlinear and conpling terms in motion equation of the system.Using the Recursive-digital-filtering Technique (RDFT),the responses of the system subjected to deterministic excitation are calculated.The results show that the nonlinear and conpling terms have significant influences to the response,even the excitation is small.A useful and efficent method is given to compute the responses of a nonlinear multidegree-of-freedom structure.
关键词
非线性振动
振动计算
飞引器结构
nonlinear vibration
recursive-digital-filtering-technique
