空气加热器振动信号的测量与处理研究

Study on Measurement and Processing of Vibration Signal for Air Heater

摘要:

针对火箭发动机试验中某加热器振动信号的测量和处理问题,首先在加热器某测点上冗余配置了两种不同型号的加速度计,完成了其振动加速度信号的测量；之后,基于MATLAB编程方法实现了加热器振动加速度信号消除趋势项和平滑预处理,通过对两种预处理结果的比较分析,得到了最终合理的振动加速度信号；最后,将振动加速度信号进行了频域二次积分解析运算,得到了其振动位移量信号；试验结果验证了信号测量的可靠性和处理结果的有效性和准确性,从而为加热器振动状况的分析提供了全面、可靠、准确的数据依据。

Abstract:

In order to resolve the vibration signal measurement and processing problem of the air heater in the rocket engine test, firstly, the measurement of the vibration acceleration signal was realized by using redundant configuration with two different accelerators. Secondly, the eliminating polynominal trend item and data smoothing pre-processing of the vibration acceleration signal was realized based on MATLAB programming method and then the final reasonable vibration acceleration signal was selected by analysis and comparing. At last, the vibration displacement signal was obtained by the quadratic integral analytic calculation in frequency domain. The test results verify the effectiveness and accurate of the measurement method and processing results and supply the credible, comprehensive and accurate vibration signal data for the analysis of the air heater.