基于小波理论的液体火箭发动机试验数据噪声处理

1引言液体火箭发动机试验(也称发动机试车)的主要目的之一,就是为了获得发动机各类参数的大量数据,因为这些数据是验证发动机设计理论,研究发动机工作性能的重要依据1]。稳态参数是液体火箭发动机试验的主要检测参数。在工程实践中,经常认为稳态参数是变化缓慢的参数,常采用降

Noise processing based on wavelet analysis for liquid propellant rocket engine test data

To eliminate the influence of noise and disturbance on the steady measurement parameters in ground test for liquid propellant rocket engine and to reduce the test data errors as well as to provide reliable and creditable test data for engine design and application departments, the ground test measurement data should be filtered and de-noised. On the basis of analysis for test data characteristics of steady for measurement parameters such as pressure, flow rate, rotating speed and temperature for liquid propellant rocket engine ground test, this paper puts forward exert wavelet analysis to deal with the steady measurement parameter data, and proposes the wavelet de-noising model and the data processing approach. The results demonstrate that the wavelet analysis method can fulfill the test data processing in the test steady stage and operation condition change stage. It is very suitable for the test data processing for liquid propellant rocket engine ground test.