摘要
对车内结构噪声进行合理降噪的有效方法是阻断振动能量传递最大的路径,为此建立传递路径模型并进行噪声贡献量分析。首先,基于发动机舱内机械构造规划出由振源到驾驶舱的多级传递路径,并在振动能量传递的连接点处设置路径拐点;然后,采用扩展工况传递路径分析(operational path analysis with exogeneous inputs,OPAX)方法确定路径中各拐点对车内噪声的贡献量,并将噪声拟合值与实测值进行分析对比。结果表明,不同路径拐点对车内结构噪声影响明显不同,其中橡胶悬置拐点对车内噪声影响最大,该处噪声拟合值与实测值也最为接近,噪声峰值达到63.5 dB,副车架拐点对车内噪声影响次之,噪声峰值为53.2 dB,排气吊耳拐点对车内噪声影响较小,噪声峰值仅为38.7 dB。采用本文方法可有效确定对车内结构噪声影响最大的路径。
The effective method of noise reduction is to block the path with the largest vibration en-ergy transfer,so the transmission path model is established and the noise contribution is analyzed.Firstly,a multistage transmission path from vibration source to cockpit is planned based on the me-chanical structure in the engine compartment,and the path inflection point is set at the connection point of vibration energy transmission.Then,the operational path analysis with exogeneous inputs(OPAX)method is used to determine the contribution of each inflection point in the path to the in-terior noise,and the noise fitting value is analyzed and compared with the measured value.The re-sults show that the influence of different path inflection points on the interior structure noise is obvi-ously different.The inflection point of rubber suspension has the largest influence on the interior noise,and the fitted noise value is also the closest to the measured value,with the noise peak value at 63.5 dB.The inflection point of subframe has the second influence on the interior noise,with the noise peak value at 53.2 dB.The peak noise is only 38.7 dB.The method presented in this paper can effectively determine the path that has the greatest influence on the noise of the interior struc-ture.
作者
白镇熇
孙硕
王楷焱
陈克
BAI Zhenhe;SUN Shuo;WANG Kaiyan;CHEN Ke(Shenyang Ligong University,Shenyang 110159,China)
出处
《沈阳理工大学学报》
CAS
2024年第3期90-96,共7页
Journal of Shenyang Ligong University
基金
辽宁省教育厅高等学校基本科研项目(LJKMZ20220603)。
关键词
车内结构噪声
传递路径规划
路径拐点
扩展工况传递路径分析
interior structural noise
transfer path planning
path inflection point
operational path analysis with exogeneous inputs
