| The dynamic performance of solid rocket engine test-bed is referred to the response characteristics of signal force value changed rapidly with time. Its index can be divided into phase-frequency index in time domain and amplitude index in frequency domain. If the dynamic performance of test-bed is not enough ideal during static testing the engine on the ground, the law of force signal changed with time can't be reappeared rapidly and distortionlessly and it will take larger errors and even cause the failure of the experiment Therefore, the research of the dynamic performance of test-bed is needed to find the way to improve dynamic performance, reduce the dynamic error produced by experiment and provide theoretical basis for optimization and improvement of the test-bed.According to the requirement of design, put up high precision test-bed used as research object to establish the simplified finite element model. Extracting different order modal of the test-bed with Lanczos method, point out the affection of different conditions of the sensor and the mass of dynamic frame on each natural frequency order through analyzing computational data. Find out the weak link of structure of test-bed by analyzing different conditions of vibration mode and frequency in order to avoid coupled vibration and provide basis for application range of test-bed.Through hammering method to strain force transducer, test dynamic characteristic of the strain force transducer with different structures and test-bed composed of bench, analyze the effect on the performance of test-bed caused by different factors such as thrust sensor, dynamic frame mass, charge mass. Motor firing test on the test-bed with different dynamic performance, analyze the errors of test results, calculate out amplitude percentage error with different conditions, analyze the effect of different dynamic performance test-bed on the dynamic error and provide theoretical support of optimization and improvement of the test-bed. |
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