板结构声振响应随机能量流分析的试验验证

Experimental validation of random energy flow analysis of vibro-acoustic response for plate structures

之前关于随机能量流分析(REFA)的研究大多基于不同方法的模型仿真,通过对单板和L型耦合板进行随机激励下的响应测试,对REFA的有效性进行研究。由于内损耗因子(ILF)是准确进行REFA数值分析的重要输入条件,提出了基于RFFA的ILF测试原理,并与经典SEA法的测试原理进行比较,基于单板试验获取了结构的ILF,并对两种方法的测试结果进行对比。L型耦合板试验则得到随机力的实测输入功率谱,将其与ILF测试值代入耦合板的REFA有限元数值模型,并考虑弯曲波与两种面内波的耦合,得到耦合板的响应预测值。L型耦合板弯曲响应的预测值与实测结果在整个试验频段上均较为吻合,表明REFA具有很好的预测精度。

Previous researches concerning random energy flow analysis(REFA)were mainly based on model simulations.In this paper,tests were carried out respectively on a single plate and an L-shaped plate,based on which the validity of REFA was investigated.Because inner loss factor(ILF)is an important input condition for accurate REFA numerical simulation,the ILF testing method based on REFA was proposed and compared with that from the traditional SEA approach.Through the tests on the single plate,the ILF was obtained based on REFA and traditional SEA,and the results from the two methods were compared.For the tests on L-shaped coupled plates,the input power spectrum of the random force was measured as known input to the REFA numerical model of the test plates,and with the ILF test results,the responses of the plates were predicted considering the coupling between flexural and two in-plane waves.A good agreement between predicted and measured response spectra for flexural wave field was observed,which verified that REFA is a reliable approach.