某航天器天线声振组合环境试验与单项环境试验对比研究

由于受地面试验技术条件的限制，目前用单项噪声或振动环境试验来模拟航天器发射及飞行过程经历的声振复合环境。文章以某航天器天线为对象，开展了声与振组合环境试验与单独噪声、单独随机振动试验的对比分析：对于该航天器天线，单独噪声试验在低频区域激励效应较差；单独振动试验则在高频部分存在结构响应衰减；声振组合试验由于耦合效应对结构高频段的响应产生抑制，使得高频部分的响应被削弱。

A comparison between vibro-acoustic environment test and single environment test for a spacecraft antenna

The spacecraft is affected by both the random excitation and the acoustic excitation during launch and high-speed flight. However, in the ground testing program, a single environment test of vibration or acoustics is chosen to simulate the complicated environment, with an insufficient exposure of the flaws of the test product. Therefore, this paper compares the vibro-acoustic environment test, the acoustic test and the random vibration test of a spacecraft antenna. It is shown that the structure response is excited insufficiently in the low frequency region in the acoustic test and is attenuated in the high frequency region in the vibration test. As a result of the acoustic and vibration coupling effect, the structure response is restrained in the high frequency region in the vibro-acoustic environment test.