Abstract
Interior booming noise during acceleration has been one of the most significant NVH problems for minivans. However, the generation mechanism of the interior booming noise remains unclear, so the access to reduce the booming noise is blocked. To solve the booming noise problem, a Source-Path-Receiver-Model-based approach is established to study the generation mechanism of the booming noise. Based on the generation mechanism, several modifications are proposed to reduce the minivan booming noise. In the established approach, the transfer path of the booming noise energy is figured out by the vehicle body and cavity experimental TPA, rear suspension dynamic analysis, and drivetrain torsional vibration analysis. Meanwhile, the vibroacoustic energy in the transfer processes is analyzed quantitatively. The identified generation mechanism is validated by the comparison of the test results of minivan interior noise and the simulation results from the established approach. During the minivan acceleration, the 5th torsional vibration mode (50.5 Hz) of the driveline is excited by the engine torsional vibration around 1500 r/min. Then, the driveline torsional resonance energy is transferred to the body and cavity through the rear suspension and finally leads to the interior booming noise. Based on the validated mechanism, several modifications are proposed to reduce the frequency response function of the driveline, the rear suspension, and the vehicle body around 50 Hz. With these modifications applied to the minivan, it is shown in the experimental results that the interior booming noise is reduced around 1500 r/min engine speed during acceleration. The mechanism study provides effective assistance with minivan interior booming noise reduction and the study approach also could be extended to explore the mechanism of other complex interior noise problems in automobiles.
Highlights
Automotive ownership in Asia has been continuously and rapidly rising during recent years [1, 2], but what followed are some serious problems of urban space and energy resources, so a kind of small and low-energy consumption automobile is strongly demanded; minivan is becoming more and more popular due to its advantages in small size, good fuel efficiency, and multipurpose [3, 4]
The 5th driveline torsional vibration mode is excited by the engine vibration at low speed around 1500 r/ min. en, the driveline torsional resonance carries a large amount of vibration energy to the rear suspension and causes a violent pitching vibration of the rear axle. e vibration energy of the rear axle pitching is transferred to the body and cavity and leads to the interior booming noise
Several modifications are proposed to reduce the minivan interior booming noise based on the generation mechanism
Summary
Automotive ownership in Asia has been continuously and rapidly rising during recent years [1, 2], but what followed are some serious problems of urban space and energy resources, so a kind of small and low-energy consumption automobile is strongly demanded; minivan is becoming more and more popular due to its advantages in small size, good fuel efficiency, and multipurpose [3, 4]. Minivan 4# is one of the most popular minivans in China, due to its large amount of productions and customers, the noise issue is fully exposed and shown to be a common problem It is a typical case of minivans: manual transmission (five forward gears and one reverse gear), 1.5 L displacement engine, and FR layout. In this study, Minivan 4# is set as the main research object to explore the generation mechanism and efficient approach to solve this problem
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