摘要
控制力矩陀螺(CMG)是航天器姿态控制的执行器,内含高速转子,是航天器上重要的振动及噪声源。对某舱外安装CMG的载人航天器密封舱开展噪声测试,发现噪声总声级过大且主要为与CMG工频及2倍频对应的单频噪声。对CMG进行隔振处理并对隔振系统特性进行分析,发现隔振措施使工频扰振力输出显著减小,但在2倍频处隔振效果弱于工频处,其原因在于受到CMG弹性的影响。载人密封舱振动噪声耦合分析表明隔振措施使密封舱薄壁振动的幅值及范围大幅减小,从而降低密封舱噪声。在安装隔振器的载人密封舱进行验证试验,隔振系统固有频率实测值与仿真结果吻合较好,CMG工频处噪声降幅达18 dB~21 dB,2倍频噪声降幅达2 dB~7 dB,与分析结果基本一致。
Control moment gyroscope(CMG) is the executor of spacecraft attitude control system. The high-speed rotor in the CMG is the critical vibration and noise source of spacecraft. In this work, a noise test is performed on a manned sealed capsule with a CMG installed outside. It is found that the interior noise is overlarge, and the noise spectrum is composed of two single tone noises corresponding to the working frequency of the CMG rotor and its double. Then, vibration isolation is adopted for the CMG and its performance is analyzed. It is shown that disturbance force of the CMG at the working frequency is dramatically reduced, however the isolation effectiveness at the doubled frequency is much less than that at the working frequency due to the flexibility of CMG in the higher frequency. Afterwards, vibro-acoustic analysis of the capsule is performed, it is shown that the CMG vibration isolation causes dramatic noise reduction. Finally, the validation test is carried out on the sealed capsule with four isolators installed, the natural frequencies of the isolation system are acquired, which agree well with those of the model prediction. The reductions of 18 dB-21 dB and 2 dB-7 dB in the noise levels at the working frequency and its double are obtained in the test, which also coincide well with predicted results.
作者
游进
姚丽坤
王昊
侯永青
金玮玮
YOU Jin;YAO Likun;WANG Hao;HOU Yongqing;JIN Weiwei(Beijing Institute of Spacecraft System Engineering,Beijing 100094,China;China Astronaut Research and Training Center,Beijing 100094,China)
出处
《噪声与振动控制》
CSCD
北大核心
2022年第2期85-89,118,共6页
Noise and Vibration Control
关键词
振动与波
载人密封舱
控制力矩陀螺
隔振
噪声控制
vibration and wave
manned sealed capsule
control moment gyroscope
vibration isolation
noise control
