Verification of the Procedure of Matrix Decimation (pmd) during the Test on the Harmonic Extortion Position in the Vehicle Inspection Stations

Personal cars are the largest group of vehicles on the road. Every year a significant increase in this group of vehicles enforces the need to shorten the time of the study of the technical condition on vehicle inspection stations. One of the major components checked during the inspection is vehicle suspension that has a decisive influence on the comfort and safety. Currently, vehicle inspection stations to assess the condition of the suspension mainly use EUSAMA method, which allows obtaining approximate results. The paper presents the verification of the effectiveness and operation of the developed method called Procedure of Matrix Decimation (PMD), which allows for useful application of research results using FFT spectral analysis of nonstationary, transient signals recorded on the vehicle during the EUSAMA test method. Verification of this method of signal processing was done with the use of vibration signals recorded on the vehicle during the EUSAMA test method on vehicle inspection stations. It consists of a comparison of the FFT spectra obtained for the secondary signal (after processing method based on PMD) with STFT analyzes made for the original signal.