战术导弹自由飞环境与试验台环境模态一致性研究

Research on Consistency of Modal of Airborne Under Free Environment and Test Environment

以战术导弹试验台振动环境的约束模态与导弹真实飞行模态的差异为背景,结合模态应变能法理论,提出了以单元模态应变能和总体模态应变能为评定标准的试验最优约束模态的判别方法;通过对导弹简化模型算例地面试验约束状态和空中自由飞行状态模态一致性分析,给出了地面试验最佳约束点的选择方法;最后,考虑到瞬态响应的特殊性,对战术导弹简化模型算例自由模态和约束模态瞬态响应进行了对比分析。理论分析与仿真试验证明了该方法的有效性。

Based on the background of difference between constrained modal and free modal of Airborne, combined with the theory of modal strain energy, differentiation method of best constrained modal based on evaluation criteria of modal strain energy is introduced. Through the research of consistency of modal of Airborne under environment of constrained mode and free mode, method to choose the best constrained point in ground test is given. Lastly, thinking of the special characteristics of the transient response, the contrast transient response analysis about free modal and constrained modal of model of Airborne is carried out. Theoretical analysis and simulation results reveal the effectiveness of the method.