摘要
给出了一个可分析轮胎滚动时振动噪声的频域计算方法。该方法先利用有限元得到轮胎在地面滚动时表面节点的振动速度,并将其转化为声学计算的频域边界条件,再利用声学边界元计算轮胎的低频振动噪声。同时对该方法的有效性进行了考评,结果表明可以在400Hz以下的低频范围内分析轮胎的振动噪声特性。利用该方法,对215/ 55R16型轮胎的振动噪声进行了分析,初步揭示了该轮胎的振动噪声主要来自于轮胎的1阶侧向振动,2阶径向振动,3阶径向、侧向复合振动以及胎侧、胎面局部振动。其中2阶径向振动噪声和胎面局部振动噪声幅度较大且容易传入车内,影响乘坐舒适性,应该作为降低轮胎低频振动噪声的重点。还揭示了轮胎噪声声压幅值随着速度升高而迅速增大;随着充气压力和载荷的增减,轮胎刚度发生变化,从而导致振动噪声的改变,但变化幅值很小,且无明显规律。
A new method was proposed which analyzes the tire noise due to vibration in the frequency domain.A finite element model was built to simulate the tire in the rolling process,and the vibration velocities of nodes were extrac- ted from tire surfaces,which can be transfered into acoustic boundary conditions in frequency domain.Then the low-fre- quency noise due to vibration below 400 Hz can be calculated by acoustic boundary element method.Numerical results show the reliability of the method.Base on the method,vibration noise of tire 215/55R16 was calculated.It is found out that vibration noise of tire 215/55R16 comes mostly from the first lateral vibration mode,the second radial vibration mode,the third-order radial and lateral composite mode,as well as the local tread vibration and the vibration on tire sides.Among these noise sources,the second radial vibration mode and the tread vibration are dominant.Besides,the numerical results show that tire vibration noise level increases sharply with the increasing speed,while changes slightly with the varying pressure and load.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第11期6-11,共6页
Journal of Vibration and Shock
