The Abnormal Sound Source Identification Study Based on the Impact Vibration Time Delay Characteristics
Abnormal noise affects the vehicle's NVH performance,The abnormal noise of automobiles is mainly impact abnormal noise.Identifying the source of impact abnormal noise is of great significance to solve the problem of the vehicle's NVH perfor-mance.Firstly,it has introduced a calculation method for Solving the forced vibration response of a damped multi-free system.Then,it has presented the definition of the time-delay characteristic of shock vibration by using a damped five-degree-of-freedom mass-spring system,and studied the effects of mass,stiffness and damping on the time-delay characteristic.Next,the article has analyzed the experimental data of the known shock and vibration to verify its time-delay characteristics.Finally,by applying the shock and vibration time-delay characteristics,we successfully found the source of the abnormal noise on the bad road of a new off-line vehicle of a certain model.Therefore,it is an effective method to use the time-delay characteristic of shock vibration to find the source of abnormal shock.
Auto NVHImpact VibrationTime Delay CharacteristicDamped Multi Degree of FreedomAbnor-mal Sound
NETL
NSTL
万方数据
维普
