【摘要】 针对航天发射过程中运载火箭发动机高量级声振激励对有效载荷的重要影响,开展了某新型液体火箭发动机噪声特性研究,对试车台上单机试车时发动机喷流噪声和目标声场进行了2次测试研究,并建立了该型火箭发动机的统计能量分析模型。将试车台上发动机声振实测数据作为统计能量分析模型的激励源,对目标声场进行分析计算,并和试车台上目标声场测量结果进行了对比分析,验证了分析方法的可行性。更多还原

【Abstract】 Because of the high cost of the spaceflight launching,the reliability of the payload must be ensured in the high level acoustic energy produced by the first stage rocket engine. It’s the base for ensuring the normal work of the instruments during the lift-off. In this paper,the exhaust noise and the specific sound field produced by the liquid rocket engine on the ground-test system are measured,and the statistical energy analysis model is built to predict the noise environment of the rocket engine. In order to obtain the noise spectrum loaded on the fairing and the instrument cabin during the lift-off,two measurements are made and some measuring locations are set for each test. During the testing,the sound pressure level around the engine spout and the corresponding heights of the payload cabin are measured. By comparing the data derived from different measuring locations for the same measurement and the different measurements for the same location,the characteristics of the noise field are obtained. Results showed that the measured data agreed well with the predicted data used AutoSEA2 software.更多还原