摘要
将导弹和振动台简化为两个子系统,分别表示为非均匀梁和弹簧质量集中参数模型。利用子系统阻抗综合原理,建立反映导弹多维振动环境试验的分析模型。给出所能提炼出的特征参数:频响函数、传递率和响应互谱。选取模型的物理参数为战术导弹和振动台的典型值,模拟飞行工况进行数值分析。通过均匀梁的两点激振试验,表明基础激励模态估计的测量方便,同样适用于有限元模型的修改;基于频响函数分析的模态估计需要测量两个子系统的界面力,使试验的难度大大增加;工作模态的估计结果受激励点之间的相干影响较大。
The missile and shaker are regarded as two subsystems and are expressed as non-uniform beam and lumped parameter model respectively. According to impedance synthesis principle, the analysis model is established to reflect the multi-dimensional environment test. Expressions of the frequency response function, transmissibility and cross-spectral are given. Physical parameters of the model are selected as typical values to simulate flight working mode and conduct numerical analysis. The two points excitation testing for uniform beam demonstrates the basic excitation modal is easy to measure and able to be applied to modify FEM. The mode estimation in view of frequency function analysis needs to measure the interface force, which enhance the complication of the testing. The operation mode estimation is sensitive to the interaction between excitation points.
出处
《导弹与航天运载技术》
北大核心
2015年第4期84-89,共6页
Missiles and Space Vehicles
关键词
多维振动
模态分析
虚拟试验
Mult-dimensional environmental
Modal analysis
Numerical analysis
作者简介
吴家驹（1939-），男，研究员，研究方向为结构动力学和环境工程
