Browse Publications Technical Papers 2019-01-1543

Comparing Interior Cabin SPL Suppression Performance Based on Vying Flat Sample Data and Requirements 2019-01-1543

Since the automobile development time becomes shorter and shorter every year in the current trend in automobile industry, OEM's NV engineers are often required to analyze vehicle systems and components in early stage in development, where the design constraints are still not severe. This analysis are refined further to parts and then to flat sample requirements. As a result, trim suppliers in the automobile industry are given Insertion Loss (IL) and Absorption Coefficients (AC) requirements for their material to satisfy. Quite often this IL and AC requirements pertain to flat sample data. Additionally, trim suppliers catalog flat sample IL and AC for most materials they have in stock and some of their competitors' materials to benchmark. Flat sample data are valuable but should not be used as the only metric in order to decide which material will be applied onto a full vehicle. This paper will highlight the confusion created in trying to make decisions solely based on flat sample data. A process will be shown that it is possible to make a fair comparison based on actual sound pressure level suppression performance inside the cabin using a Hybrid Statistical Energy Analysis (HSEA) model of a full vehicle. K&A has developed a software tool which enables engineers to easily perform this comparison analysis from flat sample data. This is a valuable tool for suppliers since it gives them the ability to choose which is the best material from their stock and just as important it gives them the ability to show their OEM clients how their product can outperform their competitors' in a vehicle. This capability allows OEMs and trim suppliers to perform early continuous verification thus enhancing their early vehicle development process.


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