液体火箭发动机试验噪声测试分析

Noise detection in test of liquid rocket engine

研究液体火箭发动机的声学特性不仅对发动机故障识别与预报有重要意义,还会对液体火箭上的有效载荷工作可靠性产生影响。为此,对液体火箭发动机试验噪声进行测试分析就显得尤为必要。针对液体火箭发动机试验噪声的特点,提出了一种适用于液体火箭发动机试验的噪声测试方法,介绍了该噪声测试系统的原理和各组成部分功能。对某型号液体火箭发动机地面试验所产生的噪声进行了测量,结合所测得的噪声信号进行了时域与频域分析,对发动机周围噪声特性进行了研究,得出了发动机在试车台上的噪声分布特征,对液体火箭发动机的设计改进和地面试验台的降噪措施有一定参考价值。

Research for the acoustics characteristics of liquid rocket engine(LRE) not only plays a very important role to identify and predict engine fault,but also impacts the working reliability of payload in LRE.Therefore,it is necessary to analyze the noise produced in LRE test.Based on the characteristics of noise in LRE test,a noise detection method suitable for LRE test is proposed in this paper.The principle of the noise detection system and functions of various parts of the system is also introduced.The noise produced in the ground test of a type of LRE was detected.The characteristics of the noise around LRE were researched in combination with time domain and frequency domain analyses for the detected noise signal.The noise distributing features of LRE on the test stand were acquired.The research result is useful to the improvement of the LRE design and the noise reduction of the ground test stand.