Font Size: 

The contribution of vibration sources in gasoline direct-injection engine is identified by simulation of two input- one output model in the paper. A partial coherence function between two inputs and one output were calculated to identify the contribution of two inputs to one output respectively. In order to valuate this method, a principle test is performed by using a laboratory test rig. The results show that the model can be used for identifying the contribution of each input to the output. Finally this model has been applied to the identification of the vibration source in a gasoline direct injection engine.