Chinese Journal of Theoretical and Applied Mechanics ›› 2019, Vol. 51 ›› Issue (2): 569-576.DOI: 10.6052/0459-1879-18-337
• Dynamics, Vibration and Control • Previous Articles Next Articles
Qing Li,Likun Xing,Jiang Bai,Yuanjie Zou
Received:
2018-10-16
Accepted:
2019-01-23
Online:
2019-03-18
Published:
2019-03-27
CLC Number:
Qing Li, Likun Xing, Jiang Bai, Yuanjie Zou. METHOD STUDY ON RESPONSE PREDICTION OF STRUCTURAL VIBRATIONS IN SPACECRAFT ACOUSTIC TESTS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(2): 569-576.
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Octave center frequency/ | Sound pressure level/ | Test tolerance/ |
---|---|---|
Hz | dB | dB |
31.5 | 128 | ±5.0 |
63 | 132 | ±5.0 |
125 | 135 | ±3.0 |
250 | 138 | ±3.0 |
500 | 137 | ±3.0 |
1000 | 136 | ±3.0 |
2000 | 134 | ±3.0 |
4000 | 132 | ±5.0 |
8000 | 130 | ±5.0 |
total sound pressure level | 144 | ±1.5 |
Table 1 Acoustic test conditions
Octave center frequency/ | Sound pressure level/ | Test tolerance/ |
---|---|---|
Hz | dB | dB |
31.5 | 128 | ±5.0 |
63 | 132 | ±5.0 |
125 | 135 | ±3.0 |
250 | 138 | ±3.0 |
500 | 137 | ±3.0 |
1000 | 136 | ±3.0 |
2000 | 134 | ±3.0 |
4000 | 132 | ±5.0 |
8000 | 130 | ±5.0 |
total sound pressure level | 144 | ±1.5 |
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 |
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 |
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