航天器噪声试验中结构振动响应预示方法研究 1)

李青,邢立坤,柏江,邹元杰

METHOD STUDY ON RESPONSE PREDICTION OF STRUCTURAL VIBRATIONS IN SPACECRAFT ACOUSTIC TESTS 1)

Qing Li,Likun Xing,Jiang Bai,Yuanjie Zou

表2 仿真结果与试验结果的误差分析

Table 2 Error analysis between simulation results and test results

Simulation results Test results Relative error/dB response point 1 total root mean square acceleration/g damping ratio 0.03 empirical damping ratio empirical damping ratio & virtual mass method 11.54 16.59 14.99 15.390 15.390 15.390 -2.5010 0.652 2 -0.2287 peak value of power spectrum density/(g2 ? Hz-1) damping ratio 0.03 empirical damping ratio empirical damping ratio & virtual mass method 4.77 6.546 4.077 3.890 3.890 3.890 0.203 9 2.260 0 0.203 9 total root mean square damping ratio 0.03 6.585 10.72 -4.2330 acceleration/g empirical damping ratio 10.37 10.72 -0.2883 response point 2 empirical damping ratio & virtual 9.370 10.72 -1.1690 mass method peak value of power damping ratio 0.03 1.072 0.7092 1.794 0 spectrum density/(g2 ? Hz-1) empirical damping ratio 1.811 0.709 2 4.072 0 empirical damping ratio & virtual 1.508 0.7092 3.276 0 mass method