Influence of tire stiffness on acceleration of wheel in forced vibration test method

The paper presents results of vibro-acoustic signal analysis (acceleration of the unsprung mass of car actuated to vibration by harmonic, kinematic vibration). The passenger car Citroen BX 14 TGE with hydropneumatic suspension and standard tire (165/70 R14 nominally pressure 1.8 [bar]) was researched. The range of research has included tire pressure changes. For the analysis process Short Time Fourier Transform method was used with superposition of rectangles window and with zero complement method. On STFT spectrum resonance frequency of unsprung mass was identified.