A Processing Method of Identifying Spectrum of Shock Load for the Combustion Gas Stream

Abstract

The spectrum of the load component is retained and the spectrum of other components are eliminated by the identifying spectrum is processed with addition or subtraction in the frequency domain. The method avoids an error that Gibbs’ vibration is generated as the signals multiply each other in frequency domain is equivalent to the signals are convolution in time domain in the filtering. On the basis of Fourier transformation, the method only using addition or subtraction obtains useful frequency components. Compare with other processing methods, the processing result can satisfy the identifying requests. In practice, the method is simple and convenient and the operational error is less. It is a try for digital signal process.