One of the key advantages of Operational Transfer Path Analysis (OTPA) as an NVH refinement framework is the maintenance of boundary conditions of the system under study since transfer functions are obtained using operational data instead of modal and acoustic excitations. Consequently, its results are sensitive to instrumentation and hence it demands a greater care for the inclusion of all coherent propagation paths within the vehicle. Application of OTPA in the automotive industry for vehicles with combustion engines is well studied, however there remains a vast scope for its implementation in modern electric vehicles due to their propulsion system’s higher operating frequency as well as the increase in directivity and mobility of high frequency noise. The presented research paper aims at utilizing OTPA as a comprehensive case study on high frequency noise propagation in an early prototype Battery Electric Vehicle (BEV) with particular focus on the distinction between air-borne and structure-borne noise. Additionally, this work investigates the instrumentation of air-borne indicators with respect to the identified acoustically sensitive paths into the passenger cabin as opposed to the near-field instrumentation commonly utilized in various TPA implementations. Moreover, the presented research employs an indirect approach in the instrumentation of parasitic paths indicators which are often challenging to identify despite their prevalence in BEVs. The outcome of this study investigates the utilization of OTPA for higher frequencies and pinpoints some of the critical paths responsible for their propagation inside the vehicle followed by a validation study that was conducted to verify the estimated path contributions. Eventually, this investigation touches upon some further challenges in frequency distinction between the air-borne and structure-borne contributions.


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    Title :

    Operational Transfer Path Analysis of High Frequency Noise Propagation in Electric Vehicles


    Additional title:

    Proceedings


    Contributors:

    Conference:

    International ATZ Conference on Vehicle Acoustics ; 2021 November 16, 2021 - November 17, 2021


    Published in:

    Publication date :

    2023-08-30


    Size :

    20 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    German




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