The sounds produced by noise sources, such as engine, tire-road interaction, wind noise, and engine auxiliaries, and transmitted through the air to the cabin are called airborne noise. The acoustic package of the vehicle is designed to provide the desired sound comfort in the passenger cabin following the vehicle target. Here, the acoustic pack of the vehicle act as a barrier in front of the sound wave, reducing its energy by reflecting it toward the source (insulation) or by transforming the sound energy to heat energy (absorption).The pressure on reducing CO2 emission in Internal Combustion Engines (ICEs) and the requirements to increase range in electric vehicles (EV) always tend to the reduction of vehicle weight. The demand to reduce vehicle weight by changing the material or reducing the size of the acoustic package is always a challenge for the noise, vibration, and harshness (NVH) engineers to determine the trade-off between the vehicle’s NVH performance and vehicle fuel efficiency. Therefore, determining the optimum acoustic pack for the vehicle is an essential factor in guaranteeing customer satisfaction in terms of vehicle acoustic comfort.This paper presents an experimental method based on transfer path analysis (TPA) to determine the optimum inner dash insulator. First, the critical regions regarding sound transmission from the engine compartment to the passenger cabin were determined with the TPA method. Later alternative dash insulators were produced with and without considering these critical regions. Transmission loss and sound absorption coefficient measurements were performed in the test room and alpha cabin for actual and alternative insulators. Finally, to verify alternative solutions, on-vehicle tests were performed, and the results were compared with the current solution.Thanks to this new approach, a saving of 21 kg in weight and €26 in cost with respect to the traditional solutions were provided with the alternative solution defined based on this study.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Determination of Optimum Dash Insulator for Vehicles by an Experimental Method


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Automotive Technical Papers ; 2022



    Publication date :

    2021-12-23




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Determination of Optimum Dash Insulator for Vehicles by an Experimental Method

    Yildiz, Mehdi / Özkan, Aytekin / Küçük, Tarık et al. | British Library Conference Proceedings | 2021


    DASH INSULATOR

    AN JANGHUN / SONG IL KYU | European Patent Office | 2022

    Free access

    Acoustical Design of Vehicle Dash Insulator

    Joshi, Manasi / Karanth, N. V. / Shravage, Paresh et al. | SAE Technical Papers | 2011


    Acoustical Design of Vehicle Dash Insulator

    Jain, S.K. / Shravage, P. / Joshi, M. et al. | British Library Conference Proceedings | 2011


    DASH PANEL FOR VEHICLES

    KIM JINHO / PARK HYUNKYUNG / JEONG JI WON | European Patent Office | 2021

    Free access