Analysis And Research On Hybrid Electric Vehicle (HEV) Interior Vibration And Noise

This paper firstly analyzes the definition, classification and the structure characteristics of the hybrid electric vehicle, and for a typical hybrid electric vehicle, analyzes and researches vehicle interior noise and vibration deeply from the subjective and objective aspects respectively, including:To identify and analyze the HEV interior noise and vibration, the arrangement of the position of sensors: the driver’s right ear, vice driver’s right ear, left ear in the back of the left side, back center and rear right ear, steering wheel, instrument panel, the driver’s seat slide, respectively test experiment has been carried out in the following conditions: housekeeping conditions(including idle, slow speed(POT) and throttle(WOT)) and driving modes, including a constant speed of 20, 40, 50, 60, 80, 100, 120, 140 km/h and acceleration). Conclusion: when at low speed, the measurement of noise sound pressure level in the driver’s right ear is low, when the speed is more than 50 km/h, the sound pressure level in the driver’s right ear is higher, and especially in the accelerated condition, the sound pressure level increases sharply in the driver’s right ear. It is because for hybrid electric vehicle, when at low speed, only motor works not engine, and the car is at pure electric mode; with the increase of speed, when the speed is more than 50 km/h, the engine begins to work, and makes the battery charged; when accelerating, motor and engine work at the same time, so the interior noise sound pressure level increases sharply.Based on the principle of transfer path analysis, through the establishment of transfer path analysis model, the simulation of the noise spectrum is close to the actual testing noise spectrum. And it is concluded that the main vibration noise transfer path is: from the three x, y, z directions at left suspension, front right suspension and back suspension the biggest transfer function spectrum value is respectively z, x, z, mainly concentrated in the range of middle and low frequency; contribution amount of the path: in the range of 100 ~ 500 Hz path the top of contribution value of the transfer function is y at back mount, the largest contribution to the interior noise is back mount, the largest contribution value of the transfer function is z at front left mount and the highest contribution value is back mount.From the subjective aspect, through the comprehensive analysis methods of clustering and classification, hierarchical clustering, mixed GANN, Monte?Carlo simulation and linear discriminating analysis, this paper evaluates the vehicle interior vibration noise level. Based on the provided data, it puts forward the hierarchical clustering algorithm and mixed GANN-LDA algorithm can effectively cluster and classify the vibration noise level. By reference to the trend of experienced noise and vibration, the comfort level between these groups is divided into five groups, namely the most cheerful, medium cheerful, critical, medium hate, and the most hate. LDA algorithm makes successfully the annoyance status of experienced vibration noise localization by using the vibration noise input database.This paper investigates and analyzes HEV interior vibration noise, increases the overall understanding of its transfer path of the source of noise, and provides detailed theoretical guidance to design、fault diagnosis and noise and vibration control. So as to promote the improvement of the HEV design, in order to in smaller research scope and the shortest cycle to get the best development plan of HEV and to accelerate its mature development.