This paper describes a study that utilises transfer path analysis to quantify the shell noise contribution of a production air cleaner and compares the results to a prototype air cleaner with different surface characteristics. This technique utilises the surface velocity of the intake manifold and air cleaner and the transfer function of both components to predict the sound at the driver's ear. A noise source (speaker) is used to excite the air cleaner to obtain this transfer function. The operational surface velocity of the air cleaner is then obtained by driving the vehicle on a chassis roll (or road). The results obtained from the transfer function and the chassis roll are combined to determine the shell noise contribution of the air cleaner at the driver's ear during vehicle operation. This methodology has proven to be a very powerful analytical tool to determine the driver's ear shell noise contribution of both the baseline and alternate air cleaner design. This method can also be utilised to develop the shell noise contribution of both the air cleaner and the intake manifold targets at the driver's ear. Typically, the driver's ear targets can be developed early in the design of the vehicle. Using this technique, the driver's ear targets can provide the surface velocity targets for both the air cleaner and the intake manifold, both as a function of frequncy and RPM. These targets can be implemented for wide-open throttle, partial throttle and idle engine conditions. This method can also be implemented with the finite element analysis technique. It provides the surface velocity targets for the analytical engineering comunity to design induction and exhaust components more efficiently in the early stage of the design process. Moreover, this methodology can provide a precise surface velocity vibration for the induction and exhaust individual component panels. Finally, this method can also be used for the exhaust system components such as the catalytic converter and the muffler. The surface velocity targets for the exhaust system components can be developed from the driver's ear target sound. In summary, the development of the induction system requires not only the bench test target setting process but also more precise vehicle-level target setting processes. The bench test target setting process can be obtained using classical acoustic bench tests, while the vehicle-level targets can be obtained from the competitive analysis of various induction system platforms. This methodology can be used for comparative analysis of an induction system, developing induction system shell noise targets at the driver's ear and development and improvement of the design process of the induction system components.
Methodology to determine component shell noise targets of vehicle induction systems
Methode zur Sollwert-Bestimmung der Geräusche von Komponenten im Fahrzeugansaugsystem
International Journal of Vehicle Noise and Vibration ; 2 , 2 ; 91-100
2006
10 Seiten, 12 Bilder, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
Anwendung im Fahrzeugbau , Übertragungsfunktion , Übertragungsverhalten , Sollwert , Lärmminderung , Luftfilter , Luftfiltergehäuse , technische Akustik , Lautsprecher , Kraftfahrzeug , Ansaugstutzen , Konstruktionsmethodik , Entwurfstechnik , Abgassystemkomponente , Anwendung im Motorenbau , mechanische Schwingung , Gehäuseschwingung
Methodology to determine component shell noise targets of vehicle induction systems
Kraftfahrwesen | 2006
|Piping systems: determine the limiting component
Tema Archiv | 1995
|Methodology to determine the clutch facing sensitivity regarding Judder in the vehicle
British Library Conference Proceedings | 2008
|Methodology to Determine the Clutch Facing Sensitivity Regarding Judder in the Vehicle
SAE Technical Papers | 2010
|