In this paper, the vibration and noise reduction technology for diesel common rail injection system is studied. The NV problems of the injection system come typically from mechanical contacts (injector needle, pump) or fluid pulsations. They are exciting the injection system, which translates the excitations to the engine through the connection points. But it's not easy to identify the characteristic of internal excitation force exactly, so the simulation model based measurement test is considered at here.
In order to predict the vibrations due to excitation related with the injection system of the diesel engine, the 1D/3D simulation models are used and the necessary dynamic tests, which are needed to create and validate the models, are done in the test bench. With the full system model validated by the operational test data of an engine, the TPA(Transfer Path Analysis) for the radiated noise is done and the main frequencies in the injection system are analyzed in the vibration and noise point of view.
The obtained results allow getting an understanding in the mechanisms causing the NVH issues for injection systems and improve the noise levels of the current injection system.