Abstract
In order for the prediction of radiation noise from vane pump for hydraulic power steering system, an analysis of vibration in actual operating condition caused by internal pressure fluctuation was conducted. From the investigation of the relation between near field noise and vibration in actual operating condition, source of noise was made clear. Also, from the measurement of eigen mode and order tracking analysis, principal modes and frequency, order number and rotating speed were made clear. From the vibration analysis of the pump and high pressure hose, mechanism to generate radiation noise and the effects of structure modification was clarified.
