【摘要】 研究高压共轨发动机的降噪和发动机经济性、动力性对整机噪声的影响。对样机的整机噪声进行测量,并通过声学扫描进行声源识别,发现前端面、进气侧、排气侧和顶面为主要的噪声源,进而对齿轮室盖加装复合钢板降噪件、排气管隔热板以及涡轮壳隔热罩均用降噪件,能够有效降低整机噪声。通过调整高压共轨系统参数研究发动机经济性和动力性对整机噪声的影响,发现增加油耗、降低扭矩能降低整机噪声。研究结果表明,发动机性能对整机噪声的影响很大,通过牺牲一定比率的动力性和经济性都能降低整机噪声。更多还原

【Abstract】 The noise of high-pressure common-rail engine and the impact of engine performances on the noise are studied. The overall noise of the prototype is measured and sound sources are identified through acoustic scan, and it is found that the front-end face, the intake side, the exhaust side and the top of the engine are the main sources of noise. So, clad steel plate is installed on the gear room, and the heat baffle of exhaust pipe and the thermal shroud of turbine shell all use noise reduction parts. These measures are very effective. Then the impact of economy and power performances of the engine on the noise is studied by adjusting the parameters of high-pressure common-rail system, and it is found that increasing the fuel consumption and reducing the torque can reduce the noise. Research results show that the engine performances have great influence on the engine noise, and the noise can be reduced at the expense of a certain percentage of economy and power performance.更多还原