振动-噪声复合试验控制技术研究

The Control Techniques in the Vibro-acoustic Test

目的解决振动-噪声复合试验中的几个控制问题,提高再入飞行动力学环境地面模拟试验的准确性。方法对振动-噪声复合试验控制原理和载荷特征进行分析,并用试验的方法对振动-噪声复合试验实施过程中两种载荷的相互影响进行测定,用统计方法对影响程度进行评估。结果振动台运行噪声对噪声控制的结果基本无影响,噪声对振动控制结果的影响程度与控制点位置有关。噪声场中振动传感器的测量本底会明显升高,试验实施过程中应尽量将传感器安装在产品内部。结论振动-噪声复合试验中2种载荷对彼此控制的影响可能会对试验结果产生影响,但只要试验设计合理,这种影响可控制在可接受范围内。

This paper is to solve some problems in the vibro-acoustic control,and improve the precision of the ground-based test of the re-entry flight environment.The control theory and load characteristics of the vibro-acoustic test are analyzed.The interactions of two loads of the vibro-acoustic test are studied through testing method.And the influence degree between the vibration and the acoustic is evaluated.The running noise of the shakers has little influence on the acoustic control result.The influence degree of the acoustic load on the vibration control result is related to the position of the control points.In the acoustic field,the noise floor of the vibration sensors will increase obviously,so the sensors should be installed inside the product as far as possible.In the vibro-acoustic test,the interactions of two loads of the vibration and acoustic may influence the test result.And the influence may be acceptable when the test is designed reasonably.