12V190大功率燃气发动机爆震测量研究

Study on Knock Measurement of 12V190 High Power Gas Engine

在一台12V190大功率燃气发动机上利用非共振式机体振动测量方法对爆震测量系统进行了试验研究。试验表明:选择合适的爆震传感器,合理设计系统采样频率,利用Blackman-Harris_窗对快速傅里叶变换(FFT)算法进行加权处理,能够有效改善爆震测量效果,提高特征频率、参照频率、爆震强度等爆震辨识过程的效率和准确性。同时,以爆震测量为基础的实时控制系统,将爆震划分为轻度、中度、重度三段区域,针对性地采用不同的控制策略,也能够较好地满足大功率燃气发动机爆震保护与控制需求。

Basing on the non - resonant vibration measurement applied on a 12V190 high power gas engines, we study the knock measurement and real - time control system. Experimentsshow that these measures that tO choose right knock sensors and design the reasonable sampling frequency and weight the Fast Fourier Transform（FFT） Algorithm by the Blackman - Harris window, is able to ef- fectively better the knock measurement effect, and improve the efficiency and accuracy of the char- acteristic frequency and the reference frequency and the knock intensity. Meanwhile, the real - time control system this is used mainly to measure detonation divides knock into the light, medium and heavy regions. According to the different control strategies, the system can satisfy the knock control and protection to the high power gas engines.