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Vibration testing is one of the key methods for verifying the structural performance of solid rocket engines. It involves securing the test piece on the vibration table with fixtures to ensure accurate transmission of vibration loads, preventing resonance or tailing phenomena, which are the desired outcomes of vibration testing for solid rocket engines. This research focuses on a certain model solid rocket engine shell vibration testing fixture clamping methods and proposes a vibration testing fixture optimization method based on a proportionality coefficient. A simulation model of the solid rocket engine shell and the fixtures is established. Modal analysis and harmonic response analysis are carried out for the structure under different proportionality coefficients of the clamping methods. The vibration testing of the shell is conducted on a ${90}\mathrm{{kN}}$ electromagnetic vibration table. The test results indicate that a proportionality coefficient of 0.9 is the optimal clamping method for the vibration testing of the solid rocket engine shell with a slenderness ratio of 2.6, which is generally consistent with the simulation analysis results. This clamping optimization method has practical reference value for vibration testing of solid rocket engine shells.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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