حسن روشندل

This research aims to investigate structural changes an‎d analyze the dynamic behavior of the steering an‎d seat systems of a vehicle during a service life of 104,000 km. This study was conducted in three stages: initial, intermediate, an‎d final. The present research seeks to provide a specific an‎d innovative method for eva‎luating the durability of vehicles an‎d to find up-to-date solutions for monitoring the technical condition of vehicles. The main goal was to eva‎luate mechanical changes, identify the wear process of sensitive parts, an‎d determine durability through accurate vibration analysis. The research method included recording accelerometer data in the three XYZ axes on the steering wheel an‎d the Z axis of the front passenger seat at a constant speed of 60 km/h. After traveling a stan‎dard distance, a comparative comparison of the data was performed using advanced frequency analysis methods including Fast Fourier Transform (FFT), Power Spectral Density (PSD), Kurtosis, Crest Factor, an‎d Root Mean Square (RMS). The results showed that the vehicle steering system has experienced critical an‎d irreversible changes. A significant increase in vibration indices, a fundamental change in frequency patterns, an‎d a significant decrease in spectral correlation coefficient indicate structural degradation an‎d a significant decrease in the mechanical quality of the system. These findings highlight the importance of periodic inspections an‎d wear prediction of sensitive vehicle components.

تحليل و بررسي ارتعاشات خودرو , تبديل فوريه سريع (FFT) , طيف توان (PSD) , آزمون دوام

Vehicle vibration analysis. , Fast Fourier Transform (FFT) , Power Spectral Density (PSD) , durability test, endurance

Hassan Roshandel

Dr. Abolfazl Khalkhali