METHOD FOR SOLVING DEGREE OF CONTRIBUTION OF NON-COMBUSTION EXCITATION SIGNAL ON BASIS OF PARTIAL COHERENCE FUNCTION

摘要

A method for solving the degree of contribution of a non-combustion excitation signal on the basis of a partial coherence function. The method comprises: step one, determining a main non-combustion excitation source; step two, determining non-combustion excitation having a primary effect on a vibration signal; and step three, according to the primary non-combustion excitation determined in step two, calculating the degree of contribution of an excitation signal to the vibration signal at a particular frequency by using a partial coherence function. The determination of the degree of contribution of a non-combustion excitation signal to a vibration signal is the basis for researching the elimination of interference in the vibration signal, is conducive to repairing partial combustion information in the vibration signal, and has an important theoretical significance and practical value in extracting combustion information using the vibration signal, monitoring the operating state of an internal combustion engine, closed-loop control over a combustion process, and fault diagnosis.