Detection method for the transmission path of the roaring sound in the vehicle under the acceleration condition

Abstract

The invention discloses a method for detecting a transmission path of vehicle interior rumbling sound during acceleration, and the method comprises the steps: collecting a vehicle interior noise value during the acceleration of an engine; extracting a vehicle interior noise peak value from the vehicle interior noise value; carrying out the order analysis according to the vehicle interior peak value, and determining the vibration frequency of the vehicle interior peak value; presetting a noise transmission path, carrying out order analysis of parts at all paths, determining a part with the vibration frequency, corresponding to a vibration order peak value, being consistent with the vibration frequency of the vehicle interior peak value, and enabling the part to serve as a part with a high correlation degree; changing the modal characteristics of the part with the high correlation degree, and collecting the vibration order peak value of the part with the high correlation degree and the vehicle interior noise peak value; and determining the transmission path where the part with the high correlation degree is located as a rumbling sound transmission path if the vibration frequency corresponding to the vibration order peak value and the vibration frequency corresponding to the vehicle interior noise peak value has set offsets at the same time. The method reduces the detection time of the rumbling sound, and also improves the detection precision.

Description

technical field [0001] The invention relates to a vehicle noise detection technology, in particular to a detection method for the transmission path of roaring sound in a vehicle under acceleration conditions. Background technique [0002] NVH refers to Noise (noise), Vibration (vibration) and Harshness (acoustic roughness). Since the above three appear simultaneously and are inseparable in mechanical vibrations such as automobiles, they are often put together for research. [0003] With the development of today's automobile market, the quality of NVH has gradually become an important factor for people to buy cars. According to relevant statistics, about 1 / 3 of all customer dissatisfaction issues are related to NVH, and about 1 / 5 of after-sales service is related to NVH. The roaring noise inside the car under acceleration conditions is one of the more serious NVH problems. A slight roar can make people feel tinnitus and dizziness, and when it is severe, it can make the dri...

AI Technical Summary

Problems solved by technology

[0005] Relying on empirical exclusion method, it is necessary to exclude the influencing factors of parts one by one, resulting in many detours

When eliminating related parts, it is difficult to ensure that the state of the whole vehicle before and after comparison is consistent, so it is easy to mislead engineers to make wrong judgments. Therefore, the investigation of roaring sounds in the prior art is not only a waste of time, but also has low accuracy.

Images