为研究车辆驾驶室噪声、振动、声振粗糙度(noise vibration harshness,NVH)性能,采用有限元软件建立某款电动商用车驾驶室和声腔有限元模型并进行声腔模态分析;以底盘左、右前减振器安装点为激励点,驾驶员右耳处为响应点进行噪声传递函数(noise transfer function,NTF)分析,并与车辆标准声压级对比.结果表明:建立的声腔模态振型分布均匀合理,声腔模态各阶固有频率避开了车辆固有频率 100.8 Hz,防止共振发生;对比车辆标准声压级要求,该模型响应点声压级在 65 dB以内,满足NVH性能标准.
Analysis of NVH performance for an electric commercial vehicle cab
In order to study the performance of noise,vibration,harshness(NVH)of an electric commercial vehicle,the finite element model of cab and acoustic cavity are established by using the finite element software,and the acoustic cavity modal analysis is carried out.Take the mounting point of the left and right front shock absorbers of the chassis as the excitation point,the noise transfer function(NTF)analysis is performed on the right ear of the driver and compared with the vehicle standard sound pressure level.The results show that the mode shape distribution of the cavity is uniform and reasonable,and the natural frequencies of the cavity mode avoid the natural frequency of 100.8 Hz of the vehicle to prevent resonance,the model response point sound pressure level is less than 65 dB,which meets the NVH performance standard.
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