Improving the Sound Pressure Level for a Simplified Passenger Cabin by using Modal Participation and Size Optimization
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2013, Vol 10, Issue 1
Abstract
The interior acoustics is an important part in the design stage for automakers in order to reduce the sound pressure level in the passenger compartment by using Computer Aided Engineering (CAE). The sound field in the vehicle interior is affected by the vibration of the body in white (BIW) and by the acoustic modal characteristics of the enclosed volume of air. The Finite Element Method (FEM) was used for a vibro-acoustic analysis of a simplified passenger compartment. In order to simulate the sound pressure level (SPL) at the hearing point of the driver while the firewall panel is excited, the modal frequency response analysis has been used. The SPL versus frequency curve shows that at the excitation frequency of 50 Hz the highest value of 87.09 dB(A) is recorded. The modal participation analysis is carried out to find the structural modes which contribute most to the sound pressure level inside the vehicle cab. Based on the analysis results, a size optimization was performed in order to lower the SPL at the driver’s ear location at the excitation frequency of 50 Hz applied to the firewall panel. The thickness parameters of the structural panels have been altered in order to reduce the interior noise level at the frequency of interest.
Authors and Affiliations
Adrian COROIAN, Iulian LUPEA
Keywords
Related Articles
- EP ID EP125900
- DOI -
- Views 52
- Downloads 0
The Analysis of Factors That Influence the Sound Absorption Coefficient of Porous Materials
In this paper are presented researches on the identification of factors that influence the sound absorption coefficient of porous materials used for absorption of the sound wave. To achieve these researches were used thr...
Numerical Simulation of Real Contact Between Two Bodies
This paper presents the effects appearing inside a beam from a overpass of Arad-Timisoara highway due to impact with a high dumper of a moving vehicle. For this analysis it is developed a simplified calculation and a num...
Study of the Behavior of a Multi Floors Building in the Case of an Earthquake Using a Piece-wise Model
This paper realizes a study for the dynamics of a multi floors building excited by a vertical earthquake type excitation. Each floor is considered connected to its neighbors by piece-wise springs and dampers. The numeric...
On the Assessment of the Vertical Vibration Behaviour of a Railway Vehicle
The paper deals with the assessment of the vertical vibration behaviour of a railway vehicle due to the random irregularities of the track. This issue is important to predict the running behaviour of the vehicle. Also, i...
THE REDUCTION OF NOISE AND VIBRATION CAUSED BY EQUIPMENT FROM BUILDINGS
Many times, in everyday life, we encounter a variety of problems arising from the inadequate functioning of equipment from civil and industrial constructions. Among the existing equipment in the construction of the buil...