基于阻抗矩阵法的车内共鸣声的传递路径分析

Transfer path analysis of booming noise in a car cabin based on impedance matrix method

为准确识别某轿车行驶过程中在2 900 r/min和3 750 r/min时车内共鸣声的来源,基于阻抗矩阵法对其进行了传递路径分析,并采用设定奇异阈值限制条件数的方法降低病态误差。分析结果表明:动力总成右悬置x、z方向、后悬置z方向对应传递路径是2 900 r/min时共鸣声的主要贡献路径,前两者贡献量大的根本原因是其激励力大,后者是其路径灵敏度高;动力总成右悬置x方向、后悬置z方向对应传递路径是3 750 r/min时共鸣声的主要贡献路径,前者贡献量大的根本原因是其激励力大,后者是其路径灵敏度高。上述分析结果对进一步制定有效的噪声控制措施、改善汽车声品质具有重要指导意义。

In order to recognize sources of interior booming noise in a car cabin at the engine speeas of 2 900 r/min and 3 750 r/min, the transfer path analysis based on the impedance matrix method was conducted and the condition number was restricted by setting a threshold to reduce ill-condition error. Results showed that the transfer paths corresponding to the x direction of the powertrain＇s right mount, the z direction of the powertrain＇s right mount and the z direction of the powertrain＇s rear mount are the main contribution paths to the booming noise at 2 900 r/min, the cause of big contribution for the former two is that they have a large exciting force, and that for the latter is that it has a high path sensitivity ; the transfer paths corresponding to the x direction of the powertrain＇s right mount and the z direction of the powertrain＇s rear mount are the main contribution paths to the booming noise at 3 750 r/min, the cause of big contribution for the former is that it has a large exciting force, and that for the latter is that is has a high path sensitivity. These results provided a guidance for noise control and improvement of car＇s sound quality.