基于HyperMesh的乘用车驾驶室NVH性能分析
程楷博,钟兵*,吴芷红
山东交通学院汽车工程学院,山东 济南 250357
摘要:为测定某乘用车驾驶室噪声、振动、声振粗糙度(noise vibration harshness, NVH)性能,采用有限元软件ANSA建立车辆内饰车身模型,HyperMesh建立驾驶室声腔模型,并采用HyperMesh将车身模型与声腔模型耦合连接,进行声腔模态分析和噪声传递函数分析。声腔模态分析结果表明:驾驶室声腔模型各阶次声压分布基本处于对称状态,符合车内声压分布规律,声腔模态结构合理。噪声传递函数分析结果表明:在不同方向、不同位置的激励作用下,驾驶员右耳处最大声压级为55.60 dB,未超出57 dB的限值规定;后排乘客右耳处最大声压级为56.25 dB,未超出58 dB的限值规定,车辆驾驶室满足NVH性能要求。
关键词:乘用车驾驶室;声腔模态分析;噪声传递函数;标准声压级
Analysis of NVH performance for a passenger car cab based on HyperMesh
CHENG Kaibo, ZHONG Bing*, WU Zhihong
School of Automotive Engineering, Shandong Jiaotong University, Jinan 250357, China
Abstract: To determine whether the noise vibration harshness(NVH) performance of a passenger vehicle cab meets the specified standards, ANSA infinite element software is used to build the car body model, HyperMesh is used to build the cab acoustic cavity model, and HyperMesh is used to couple the car body model and the acoustic cavity model. The cavity modal analysis and noise transfer function analysis are carried out. The results of acoustic cavity modal analysis show that the sound pressure distribution of each order of the cab model is basically symmetrical, which accords with the sound pressure distribution in the car and the structure of the acoustic cavity modal is reasonable. The results of the noise transfer function analysis show that under the excitation of different directions and positions, the maximum sound pressure level at the right ear of the driver is 55.60 dB, does not exceed the limit value of 57 dB, the maximum sound pressure level at the right ear of rear passenger is 56.25 dB, does not exceed the limit value of 58 dB, and the cab of the vehicle meets the performance requirements of NVH.
Keywords: passenger car cab; acoustic cavity modal analysis;noise transfer function; standard sound pressure level