Automobile driving shaft load spectrum acquisition and compilation method

The invention discloses an automobile driving shaft load spectrum acquisition and compilation method. The method comprises the following steps: determining load spectrum acquisition parameters; carrying out selection and installation position interference checking on a load spectrum acquisition sensor; formulating a load spectrum acquisition scheme, and performing load spectrum acquisition; the collected load spectrum is preprocessed; carrying out characteristic value statistics on the preprocessed load spectrum, and evaluating whether a test result is good or not; determining upper and lower thresholds of load spectrum time domain extrapolation by using a graphical method and an estimator stabilization method; according to the determined upper and lower thresholds, respectively extracting peak and valley values of each load; calculating a peak value excess and a valley value excess of each load by using the peak and valley values and the upper and lower threshold values, and replacing the original peak value