直列六缸柴油机燃油泵齿轮系噪声优化研究

Research of Noise Optimization of Fuel Pump Gear Training Systems for In-Line Six-Cylinder Diesel Engines

建立了燃油泵齿轮系的简化弹性质量体模型,仿真分析得到其扭转振动响应。结果表明:燃油泵工作频率和发动机着火频率不一致,引起燃油泵齿轮轴扭振幅值较大且峰值波动较大,是燃油泵齿轮系声音异常的主要因子。通过优化燃油泵速比和初始相位,其扭振幅值降低60%,峰值无波动;噪声试验验证优化后的燃油泵齿轮系异响消失,噪声声压级水平总体降低了0.9 dB(A)。

The simple elastic mass model of fuel pump gear training system was built and simulation anal- ysis was carried out to obtain its torsional vibration response. The results indicated that the torsional vi- bration of fuel pump gear training system had high amplitude and big peak fluctuate when the working fre- quency of fuel pump did not coincide with engine fire frequency. It was key factor of abnormal noise of fuel pump gear training system. By optimizing speed ratio and initial working phase of fuel pump, the tor- sional vibration amplitude was reduced by 60% and had no peak fluctuate. The noise testing indicated that abnormal noise had disappeared and the overall sound pressure level had reduced by 0.9 dB （A）.