Improved vehicle interior structure-borne noise induced by the powertrain using parallel dry friction damper

Because of the higher requirements for vehicle comfort and people’s increasing ecological consciousness, research on the interior noise in a vehicle has received wide attention, among which structure-borne noise is hard to diagnose. To solve the problem, the transfer path analysis method of powertrain structure-borne noise has been systematically analyzed. By introduction of the powertrain source-path-receiver model, this method enables the researchers to estimate and study the noise, vibration, and harshness transfer functions and their operational forces. The aim is to further improve noise, vibration, and harshness with minimal negative impact on other vehicle attributes, such as ride comfort, handling, drivability, durability, etc. In this article, a parallel dry friction damper was added to the vehicle nearside powertrain mount, which is the most significant one to the receiver of passenger vehicle for improving its interior structure-borne noise induced by the engine. The test vehicle was a midsize executive vehicle. Since the structure-borne noise is composed of multiple paths, then the transfer path analysis test of the vehicle was carried out, and the transfer function and operational data at speed range started from 20 to 100 km/h were obtained. On the basis of the transfer path analysis results and the above principle, the friction damper on the body side of the nearside mount is improved by combination of the experimental transfer path analysis and the final measurements. The results indicate that a significant reduction for the A-weighted sound pressure level of the interior noise has been gained when the frictional damper was added to conventional mount.

Download Full-text

Transfer Path Analysis of a Vehicle Subframe: Measurements in Six Degrees of Freedom

Volume 1A: 16th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc97/vib-4248 ◽

1997 ◽

Author(s):

Lars Ivarsson

Keyword(s):

Path Analysis ◽

Transfer Functions ◽

The Body ◽

Impedance Method ◽

Transfer Path ◽

Rotational Components ◽

Improve Measurement ◽

Engine Mount ◽

Six Dof ◽

Transfer Path Analysis

Abstract A Transfer path analysis (TPA) is undertaken for a car subframe concerning six DOF of freedom and two coupling points up to 500 Hz. Integrated stingers have been developed to improve measurement results. The relative importance of the rotational components is investigated. The blocked impedance method has been used to couple the subframe to the car body using measured mobilities via two isolators out of four. The sound sensitivity is measured directly for the coupled system and compared with the total sum of the calculated transfer path components which are calculated with measured mobilities and transfer functions. Calculated and measured results show good agreement. The importance of the rotational paths depends on the characteristics of the isolator and the structures where it is mounted. It was found that the front mount position is more sensitive to rotations compared to the rear mount position. The rear mount position is also a much stiffer construction. It was found that above 220 Hz, the rotational paths are of the same importance as the translational paths when both points were connected to the body frame. It was also found that for the rear mount position, only one translational transfer path dominates. These conclusions do not differ especially for different excitation directions at the engine mount position.

Download Full-text

Analysis and Study of the Transmission Path Based on the Body and NVH

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.385-386.272 ◽

2013 ◽

Vol 385-386 ◽

pp. 272-275

Author(s):

Xia Liu ◽

Hua Jin Yan ◽

Xiu Jie Liu ◽

Xia Sun

Keyword(s):

Path Analysis ◽

Modal Analysis ◽

Theoretical Basis ◽

Exhaust System ◽

The Body ◽

Structural Damping ◽

The Road ◽

Transfer Path ◽

Transfer Path Analysis ◽

Noise Vibration

In the field of automotive engineering, noise and vibration in the car comes mainly from the engine and the road passed through the body, suspension, mount and exhaust system path to the car or reverberation. So this article , a model of white body transfer path analysis and research, improves the rigidity of white body, to reduce noise, vibration, and weight is reduced, and find out the resonance phenomena because of insufficient stiffness of car body, combining body CAE modal analysis results provide the theoretical basis for the optimization of structural damping.

Download Full-text

Transfer Path Analysis of Body Panel Participation Using a Structural-Acoustic Finite Element Model

ASME 2012 Noise Control and Acoustics Division Conference ◽

10.1115/ncad2012-1016 ◽

2012 ◽

Author(s):

Shung H. Sung ◽

Donald J. Nefske

Keyword(s):

Finite Element ◽

Path Analysis ◽

Element Model ◽

Operating Conditions ◽

The Body ◽

Interior Noise ◽

Theoretical Development ◽

Transfer Path ◽

Transfer Path Analysis ◽

Body Panel

In transportation vehicles under operating conditions, interior noise frequently results from forces transmitted through the vehicle structure that excite body panel vibrations that couple with the body modes to radiate noise to the interior. The body panel participations to the interior noise that result from the force transfer paths can be identified using acoustic and structural-acoustic finite element models of the vehicle. This paper describes the transfer path analysis method to identify the body panel and modal participations for prescribed forcing excitations to the vehicle and to evaluate the effect of structural modifications. The theoretical development of the structural-acoustic finite element method and its example applications to two automotive vehicles are presented.

Download Full-text

The Design of Vehicle Interior Noise Using Binaural Transfer Path Analysis

10.4271/1999-01-1808 ◽

1999 ◽

Cited By ~ 8

Author(s):

K. Genuit ◽

J. Poggenburg

Keyword(s):

Path Analysis ◽

Interior Noise ◽

Vehicle Interior ◽

Transfer Path ◽

Vehicle Interior Noise ◽

Transfer Path Analysis

Download Full-text

Analysis and Optimization of Interior Noise Based on Transfer Path Analysis

10.1007/978-3-030-89098-8_51 ◽

2021 ◽

pp. 542-551

Author(s):

Wenqiang Liu ◽

Junfeng Hu ◽

Fengxin Jiang ◽

Bing Gong ◽

Xiaolong Deng ◽

...

Keyword(s):

Path Analysis ◽

Interior Noise ◽

Transfer Path ◽

Transfer Path Analysis

Download Full-text

Mechanism of interior noise generation in high-speed vehicle based on anti-noise operational transfer path analysis

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407020937219 ◽

2020 ◽

Vol 235 (1) ◽

pp. 273-287

Author(s):

Ningning Liu ◽

Yuedong Sun ◽

Yansong Wang ◽

Pei Sun ◽

Wenwu Li ◽

...

Keyword(s):

Path Analysis ◽

High Speed ◽

Noise Signal ◽

Interior Noise ◽

Analysis Model ◽

Noise Sources ◽

Wind Noise ◽

Transfer Path ◽

Transfer Path Analysis ◽

Path Analysis Model

Owing to the continuous development of the automobile industry, increasingly stringent performance requirements for noise, vibration, and harshness of automobiles are being presented. Interior noise control in high-speed vehicles has not been adequately addressed, owing to the complex mechanism of noise generation. As simulations performed previously focused on vehicle wind noise and tyre noise cannot adequately predict the effect on passenger ear-side noise, these issues are investigated in this study. Their effects on passengers are investigated using transfer path analysis. An anti-noise operational transfer path analysis is proposed to study noise generated in high-speed vehicles. The established anti-noise operational transfer path analysis model can eliminate crosstalks between noise source signals of different transmission paths. The model is validated by comparing the measured and calculated values of the anti-noise operational transfer path analysis model. The coherence of the input noise signal and the ear-side noise signal of the passenger is assessed using coherence analysis. By calculating and categorising the contributions of different noise sources in different locations and types, the main noise sources affecting passenger comfort are determined. The result indicates that the main noise sources affecting the passenger’s ear-side noise change from engine noise to left-A wind noise and tyre radiation noise with increasing vehicle speed, in which the proportion also increase. The proposed anti-noise operational transfer path analysis is suitable for the interior-noise analysis of high-speed vehicles, and this study may serve as a reference for future studies regarding active and passive noise control in high-speed vehicles.

Download Full-text