부분기여도함수를 이용한 GDI 제품의 진동기여도 분석기법 연구

This paper presents the method estimating the contribution of vibration sources in GDI powertrain components with a multiple input system. Partial coherence function (PCF) has used to identify the cause of a linear dependence indicated by an ordinary coherence function. In order to apply the PCF to the vibration source identification in power train system of a GDI gasoline engine, the virtual model of two inputs and single output system is simulated. For the validation of this model, the vibration of powertrain components was measured by using tri-axial accelerometers attached on the selected vibration sources, which are high pressure pump, fuel rail, injector and pressure sensor. After calculating the partial coherence between each source based on the virtual model, the vibration contribution of powertrain system is calculated. This virtual model based on PCF is implemented to determine the quantitative vibration contribution of each powertrain components.