Binaural Transfer Path Analysis (BTPA) was originally developed for assessing the binaural contributions of individual vehicle noise paths. Binaural Transfer Path Synthesis (BTPS) is the process of creating listenable vehicle interior noise data based on a BTPA model, also allowing for modifications. Modern methods of combustion (TDI, CDI, fuel direct injection etc.) in combination with new generations of valve trains and more light-weight materials in engine construction have produced changes in the temporal and spectral behavior of primary oscillation factors. As a consequence, the in-car noise produced by the engine is being determined more and more by higher frequency components. In the paper new, future-oriented methods of analysis are presented. Engine noise transmission fundamentally occurs in two ways: a) the structure-borne path which is stimulated by the engine mountings and b) the airborne path which is fed by the direct sound radiation of the engine. For both paths, improved models which are traceable in signal and system theory are presented and their methodology is described. The authors arrived at an extremely simplified yet adequate model version of the complicated structure. An especially important improvement of the structure-borne transfer paths introduced here is the description of the mechanical interfaces via complex four-pole parameters. Considering airborne sound transmission, the authors reduce the in-car source measurement that was previously mandatory by describing the engine with an alternative source model which could be highly simplified through multi-pole source synthesis and which can be derived from test-bench measurements. Using this simple model, the user receives a tool by means of which changes in transfer paths (e.g. the influence of the engine mounting) can be modeled in a theoretically correct way and the results can be made audible immediately
Description of broadband structure-borne and airborne noise transmission from the powertrain
Beschreibung der breitbandigen Körper- und Luftschallausbreitung aus dem Powertrain
2006
12 Seiten, 14 Bilder, 6 Quellen
Conference paper
Storage medium
English
Description of Broadband Structure-borne and Airborne Noise Transmission from the Powertrain
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