NVH performance improvement of a turbo-charged GDI engine based on the simulation and experiment studies

Paper #:
  • 2017-01-2426

  • 2017-10-08
Turbo-charged GDI technology is more and more widely used, which can meet the high demand of the engine performance and efficiency, but the resulting reliability and NVH issues also need to be paid attention to. Traditional NVH performance is mostly based on the experience design, repeatable test, which leads to longer development period, high cost, and also ineffective results. Along with the development of the simulation technology, NVH performance simulations play more important role in engine vibration and noise prediction. Usually The Force response analysis is used to compare the NVH performance of the engine structure, considering the standard excitation. Currently, dynamic analysis of the crank train, valve train, and piston can be carried out, and then the whole engine vibration and airborne noise can be predicted directly, considering different speed and load. In this paper, The NVH performance of a turbo-charged GDI engine is studied based on the simulation and experiment. Firstly the engine NVH target is set up, including the airborne noise, mount vibration and so on, additionally the target is broken down into system and component if possible; Secondly, the mechanism dynamics, engine vibration and noise simulations were carried out. The weaknesses of the original engine design had been found out. Some appropriate structural improvements to the main parts and new NVH performance prediction were done according to the objective of NVH performance. Then experiment is done and showed that simulation method of radiation noise OA level prediction is basically correct, and a series of structural improvement measures are very effective. NVH experiment results also indicated that simulation some special problems, such as the turbocharger noise which was also investigated, and some remarkable effects have been achieved.
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