密封舱控制力矩陀螺振动噪声控制分析与验证 |
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引用本文: | 朱鑫,刘晓昂,陈勇,蒋春雷.密封舱控制力矩陀螺振动噪声控制分析与验证[J].噪声与振动控制,2009,39(2):85-89. |
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作者姓名: | 朱鑫 刘晓昂 陈勇 蒋春雷 |
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作者单位: | ( 1. 北京空间飞行器总体设计部,北京100094; 2. 中国航天员科研训练中心, 北京100094 ) |
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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。
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关 键 词: | 振动与波 载人密封舱 控制力矩陀螺 隔振 噪声控制 |
收稿时间: | 2018-05-25 |
修稿时间: | 2021-04-28 |
Design Method of the Powertrain Mounting System of Pure Electric Vehicles |
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Abstract: | Considering the difference on powertrain excitation between the pure electric vehicle (PEV) and the traditional internal combustion engine car, this paper established a six degrees of freedom dynamic model of a certain type of a PEV powertrain. Firstly, the target of the powertrain natural frequencies and energy distributions are given. Taking the mount static stiffness and the installation positions as design variables, the Matlab/Isight software is used to optimize these parameters. After optimization, the optimized natural frequencies and energy distributions satisfy the design requirements. In order to control the displacement of powertrain center of gravity (C.G.) in the typical and extreme conditions, the static stiffness and x-coordinate of the tuning points of each mount in the nonlinear sections are designed. After design, the displacement of the powertrain C.G. satisfy the control requirements. |
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