Radiated Noise from Tire/Wheel Vibration

1997 ◽  
Vol 25 (1) ◽  
pp. 29-42 ◽  
Author(s):  
E-J. Ni ◽  
D. S. Snyder ◽  
G. F. Walton ◽  
N. E. Mallard ◽  
G. E. Barron ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Sound Quality ◽  
Vehicle Body ◽  
Body Structure ◽  
Vehicle Interior ◽  
Noise Sources ◽  
Airborne Noise ◽  
Total Vehicle ◽  
Noise Vibration ◽  
Wheel Vibration

Abstract As a general trend, vehicle sound quality has significantly improved in recent years. This is primarily due to improved body structure and powertrain design. As demand for better vehicle sound quality increases, it is important to study all possible noise sources contributing to noise, vibration, and harshness (NVH). Tire vibration has long been recognized as a source of airborne noise. Some effects of wheel design on tire noise have also been well understood for sometime. But the dynamic interaction between tire and wheel designs and its effect on vehicle NVH, although frequently observed for many years, has only recently been identified in the 200–350 Hz frequency range. Different wheels can produce perceptible differences in vehicle interior sound pressure levels in a road test. Hence, the authors have developed a process to quantify and reduce noise caused by a vibrating tire/wheel assembly. This paper discusses the general flow of the process, which begins with the identification of NVH issues on a total vehicle level. Modeling and optimization of the aluminum wheel was chosen as the focus of this project for two reasons. First, the interior sound pressure level (SPL) around 285 Hz is about 5–7 dBA higher in a vehicle equipped with aluminum wheels rather than a steel design. Second, modifying the wheel is far more economical and faster due to its simplicity of design than the complexity of either the vehicle body structure or a tire.

scholarly journals A Numerical Approach for Sound Quality of Vehicle Doors

2020 ◽  
Vol 25 (1) ◽  
pp. 9-16
Author(s):  
Erkut Yalçın ◽  
Halil Bilal ◽  
Ayhan Yağcı ◽  
Haluk Erol
Keyword(s):  
Sound Pressure ◽  
Sound Quality ◽  
Numerical Approach ◽  
Design Sensitivity ◽  
Point Of View ◽  
Vehicle Body ◽  
Fem Model ◽  
Body Development ◽  
Design Variables

A Vibro-Acoustic Finite Element Method (FEM) model capable of calculating the transient sound pressure generated by the door slam of a vehicle was developed in this study. A design sensitivity analysis (DSA) was performed for investigating the effects of major design variables on the related sound quality metrics. The methodology was developed using a sedan-car and its FEM model. This paper shows that a Computer Aided Engineering (CAE) model can be used as a rather powerful tool for giving design change decisions for the door components from sound quality point of view during vehicle body development according to psychoacoustic parameters.

Test and Analysis on Motorcycle Noise by Synthesized Transmission Route Method

2012 ◽  
Vol 233 ◽  
pp. 307-310
Author(s):  
Qi Huang ◽  
Tong Wen ◽  
Cheng Kei Liu ◽  
Zeng Long He
Keyword(s):  
High Frequency ◽  
Sound Pressure ◽  
Exhaust System ◽  
Sound Quality ◽  
Transmission Route ◽  
Great Contribution ◽  
Noise Sources ◽  
Subjective Judgment ◽  
Standard Position ◽  
Sound Pressure Levels

The noise sources were tested and analyzed by SQLab II system on one typical motorcycle. The states of sound pressure levels are predicted by the synthesized transmission route method on different noise sources which are located at the standard position. Compared with different shield states, the results show that noise from the exhaust system is the main source and noise in high-frequency not only makes great contribution to all noises about sound quality, but also has bad influence on people’s subjective judgment.

scholarly journals Vehicle Interior Noise Prediction Based on Elman Neural Network

2021 ◽  
Vol 11 (17) ◽  
pp. 8029
Author(s):  
Min Li ◽  
Wei Zhou ◽  
Jiang Liu ◽  
Xilong Zhang ◽  
Fuquan Pan ◽  
...  
Keyword(s):  
Neural Network ◽  
Sound Pressure Level ◽  
Sound Pressure ◽  
Pressure Level ◽  
The Body ◽  
Side Impact ◽  
Vehicle Body ◽  
Target Point ◽  
Vehicle Interior ◽  
Elman Neural Network

Vehicle interior noise is an important factor affecting ride comfort. To reduce the noise inside the vehicle at the vehicle body design stage, a finite element model of the vehicle body must be established. While taking the first-order global modal of the body-in-white, the maximum sound pressure level of the target point in the vehicle, the body mass, and the side impact conditions into account, the thickness of the body panel as determined via sensitivity analysis is treated as the input variable, and the sample is determined by following the Hamersley experimental design. Specifically, the Elman neural network predicts the noise value in the vehicle, and a vehicle body structure optimization method that comprehensively considers NVH performance and side impact safety is established. The prediction errors of the Elman neural network algorithm were within 3%, which meets the prediction accuracy requirements. To achieve satisfactory restraint performance, the maximum sound pressure level of the target point in the vehicle is reduced by 5.92 dB, and the maximum intrusions of the two points on the B-pillar inner panel are reduced by 31.1 mm and 33.71 mm, respectively. The side impact performance is improved while the noise inside the vehicle is reduced. This study provides a reference method for multidisciplinary research aiming to optimize the design of vehicle body structures.

Investigation on Technology of Automobile Vibration and Noise Reduction Based on Body-In-White Structure

2011 ◽  
Vol 474-476 ◽  
pp. 676-680
Author(s):  
Qiao Sheng Hu ◽  
Feng Ni ◽  
Shu Guang Zuo ◽  
Jian Ping Lin ◽  
De Guang Fang ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Significant Contribution ◽  
The Body ◽  
Vehicle Body ◽  
Vehicle Interior ◽  
Interior Space ◽  
Automotive Body ◽  
Noise Characteristics ◽  
Body In White ◽  
Noise Vibration

The automotive body system is not only a source for directly radiating noise into the vehicle interior space, but also a key component for transmitting various vibrations and noise. The optimization of the modes for body-in-white has significant meanings for improving the reliability and NVH (Noise, Vibration and Harshness) performance of the whole vehicle. Based on the current situation that there is more severe interior vibration and noise problem occurring in driving for a light passenger vehicle, a hybrid modal analysis method combined with experiment and simulation methods is applied to investigate the vibration and noise characteristics of the whole vehicle body. By performing such modal analysis, the modal frequencies of the auto-body are improved effectively by strengthening the vibration sensitive regions in the body structure. The experiment for measuring interior vibration and noise levels under cruise condition is conducted to validate that the structural optimization for body-in-white has significant contribution for improving the whole vehicle NVH performance.

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