基于试验的燃烧噪声传递函数求解及噪声预测

在不同运行工况下对D19TCI电控共轨柴油机进行噪声试验,采用时间同步和最小二乘法拟合的方法对缸压和噪声信号进行预处理,去除干扰信号和趋势性信号的影响。基于柴油机倒拖和不同喷油策略的噪声试验数据得到柴油机燃烧噪声及燃烧噪声传递函数。试验结果表明:在同一台柴油机上,缸内压力与各个方向表面辐射燃烧噪声之间存在一定的传递关系;采用多元回归分析方法计算得到的传递函数预测燃烧噪声具有较好的准确性。

Calculation of Combustion Noise Transfer Function by Experiment Method and Prediction of Combustion Noise

The noise experiments of D19TCI electronically controlled common rail diesel engine were conducted under different operating conditions,the cylinder pressure and noise signals were preprocessed by time synchronization and least squares polynomial fitting to remove the influence of interference signals and trend signals.Based on the noise test data of engine motoring and different injection strategies,the combustion noise and combustion noise transfer function of diesel engine were obtained.The test results show that:There is a certain transfer relationship between the in cylinder pressure and the surface radiated combustion noise in all directions on the same engine;The transfer function obtained by multiple regression analysis has better accuracy in predicting combustion noise.