Noise prediction method for power assembly

Abstract

The invention provides a noise prediction method for a power assembly, and belongs to the field of vehicle noise control. The noise prediction method comprises the following steps: carrying out a multi-working-condition vibration noise test on a test vehicle provided with a first target test point; according to the data of the first target test point, obtaining a first transfer function of the passive end of each power assembly suspension on the test vehicle to the noise in the vehicle by using a working condition transfer path analysis method, a second transfer function of each power assembly near field to noise in the vehicle and a third transfer function of each power assembly suspension from an active end to a passive end thereof; performing a rack NVH test of a target working condition on the target power assembly provided with the second target test point; and calculating the total noise value of the target power assembly according to the data of the second target test point, the first transfer function, the second transfer function and the third transfer function. According to the noise prediction method for the power assembly, the later vehicle adjustment period can be shortened, and the vehicle research and development cost is reduced.

Description

technical field [0001] The invention belongs to the field of vehicle noise control, in particular to a powertrain noise prediction method. Background technique [0002] With the continuous improvement of people's material living standards, consumers have higher and higher requirements for car ride comfort, and car NVH (Noise, Vibration and Harshness, noise, vibration and harshness) performance has a direct impact on ride comfort. It has become one of the most important evaluation indicators of automobile quality, reflecting the core competitiveness of products. According to relevant statistics, about 1 / 3 of the car problems complained by users are related to NVH, of which the total NVH problems of motor vehicles account for a large part. Motion is always one of the main incentives for vehicle noise and vibration, and the quality of dynamic sound directly affects the NVH performance of the vehicle. [0003] The development of the dynamic assembly is earlier than the complet...

AI Technical Summary

Problems solved by technology

The traditional method for the prediction of total noise in the car, due to the variety of tests, difficult operation, requires a lot of manpower and material support, long cycle, low efficiency, which is prohibitive in the fast-paced development process

For the CAE method, due to the complex structure of the vehicle and the dynamic structure, the structural model and the acoustic-vibration coupling model contain a very high number of meshes and degrees of freedom, the control of the boundary and the accuracy of the model are very difficult, and the time required for one calculation Long, low efficiency, and the error of calculation results is not easy to guarantee

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