摘要
针对某纯电厢式微卡在高速行驶时产生的轰隆声问题,通过仿真分析与道路测试相结合的思路,识别出轰隆声的特征与产生机理:高速行驶下气流通过车身与货厢间隙进入导流罩内部腔体,导致腔体内空气产生自激振荡与板壁件共振耦合,在驾驶室内产生具有能量高、频率低、频谱宽特征的脉动声压。通过对车身结构加强、增加声学包、货厢间隙调整、导流罩外形优化等方案的验证,最终确定了导流罩外形优化的可工程化方案,经实车道路测试与评价,相比原基础状态,车内80~120 Hz频段驾驶员右耳噪声降低约3.9 dB(A),问题得到解决,并为后续气动噪声优化提供了参考。
In order to resolve the problem of low-frequency rumble sound of a battery electric micro-truck at high speed,identified the characteristics and generation mechanism of the sound through computational fluid dynamics simulation and road test.The high-speed air enter the cavity of the air deflector through the gap between the container and cab,which exciting the self-excited oscillation and acoustic resonant coupling,which causes low frequency and high energy charac-teristics sound pressure inside the cab.The engineering scheme for optimizing the shape of the air deflector is finally determined by verifying the schemes of body structure strengthening,acoustic package coating,cargo compartment clearance adjustment,and shape optimization of the air deflector.According to the road test and evaluation of the actual vehicle,compared with the original basic state,the noise of the right ear in the 80~120 Hz frequency band is reduced by about 3.9 dB(A),and the problem is solved and it provides a reference for the subsequent aerodynamic noise optimization.
作者
焦安勇
孙杨
张彬
JIAO Anyong;SUN Yang;ZHANG Bin(Forland Business Unit,Beiqi Foton Motor Company Limited,Weifang 261000,China)
出处
《汽车实用技术》
2024年第17期115-120,共6页
Automobile Applied Technology
关键词
纯电厢式微卡
轰隆声
导流罩
流体力学
Battery electric micro-truck
Rumble sound
Air deflector
Computational fluid dynamics
