基于子结构导纳法的UUV发动机本体参数化建模研究

Parametricmodeling of UUV engine body based on substructure receptance method

为实现UUV发动机本体结构的参数化建模,基于模态分析结果以及外部激励特性,建立子结构等效模型。根据能量守恒原理以及导纳功率流的定义计算了各子结构的等效线导纳,根据边界连续条件确定耦合结构振动方程,最终建立了发动机本体振动传递参数化模型,计算了发动机本体不同位置处的输入导纳;通过试验对模型的有效性进行了验证。以发动机本体所受激励作为输入,根据所建模型开展了参数影响分析,结果表明:在400 Hz^1.8 kHz频段内,气缸轴向力以及滚轮切向力对舱段壳振动响应的贡献较大,建模中需要考虑发动机不同方向上的振动传递特性;增大摆盘箱端盖厚度能够显著降低舱段壳的振动响应。

To acquire a parametric model of UUV engine body,based on modal analysis results and external excitation characteristics,the equivalent model of its each substructure was established and their line receptances were calculated based on the principle energy conservation and the definition of mobility power flow.According to boundary continuity conditions,the coupling vibration equations between substructures were established,and finally,a vibration transfer parametric model of UUV engine body was obtained.The input receptances at different positions of the engine body were calculated.The model was validated with mechanical receptance tests.Taking external excitations as inputs, the influences of some major parameters of the model were analyzed.Results showed that in the range of 400Hz -1.8kHz, the axial force applied on cylinder block and the tangential force of rolling wheel make major contribution to the vibration response of cabin shell;the vibration characteristics of the engin body in different directions need to be considered in engine modeling;increasing the thickness of swing tray box＇s end cover can significantly reduce the vibration response of cabin shell.