666.CONTRIBUTION ON INVESTIGATING THE POSSIBILITY OF USING TWO-PARAMETER FREQUENCY ANALYSIS IN EXPERIMENTAL PARAMETER IDENTIFICATION OF TORQUE VIBRATIONS OF VEHICLE CARDAN SHAFTS

Abstract

During exploitation, motor vehicles are subjected to vibration loads that lead to fatigue of their users and materials of their aggregates. Therefore, vibrations must be studied from the earliest stage of development, using mathematical models, experiments, or their combinations. In theoretical studies, vibrations of concentrated masses are usually observed, although, with the development of numerical methods (especially finite element method), attention is paid to vibrations of elastic vehicle systems. Then, idealizations are usually made, especially regarding operational conditions and relationships between motor vehicle aggregates. In this paper, an attempt was made to de-velop a method for identifying real vibration loads of elastic vehicle cardan shafts under operational conditions. Namely, 2D Fourier transformation was used for two-parameter frequency analysis. The possibility of the procedure's application was demonstrated on an idealized elastic cardan shaft. The research showed that two-parameter frequency analysis can be used to generate torsional vibrations of elastic vehicle cardan shafts in laboratory conditions.