NVH investigation of power steering system hydraulic pump

Abstract

Paper presents a method for analyzing the noise and vibration problem caused by hydraulic pump of a vehicle power steering system. The method is based on experimental research and coherent analysis of observed system. Measurements are performed order to determine dominant excitation of hydraulic system in different operating conditions. Pump number of revolution was constant and was varie. Pressure of oil in hydraulic system is varied too. A method of assessment and determination of dominant NVH pump excitation is presented. Experimental results are input and output data in coherent analysis. Results showed that number of measuring channels can be reduced, especially in high frequency domain. Obtained results can be used in experiment design.