Browse Topic: Headlining

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Enhanced Acoustic Performance using Key Design Parameters of Headliners2015-01-233906/15/2015
Sound absorption materials can be key elements for mass-efficient vehicle noise control. They are utilized at multiple locations in the interior and one of the most important areas is the roof. At this location, the acoustic treatment typically comprises a headliner and an air gap up to the body sheet metal. The acoustic performance requirement for such a vehicle subsystem is normally a sound absorption curve. Based on headliner geometry and construction, the sound absorption curve shape can be adjusted to increase absorption in certain frequency ranges. In this paper an overall acoustic metric is developed to relate design parameters to an absorption curve shape which results in improved in-vehicle performance. This metric is based on sound absorption coefficient and articulation index. Johnson-Champoux-Allard equivalent fluid model and diffuse field equations are used. The results are validated using impedance tube measurements. It is shown the specific airflow resistance of the
Calçada, Márcio, Parrett, Alan
Technical Paper
Globalization is in the driver's seatAUTOMAY07_0505/01/2007
Johnson Controls is positioned to supply everything from single components to complete interiors wherever in the world it is needed. The automotive industry's sales are increasingly distributed to markets all over the world, and at the same time, the engineering talent needed to design components for those cars is also globally distributed, remarked Charles Baker, Group Vice President for Engineering in Johnson Controls' Automotive Experience division. That scenario means that suppliers such as JCI are also increasingly spread over the globe, supporting customers as they move into new markets, tapping local talent to develop products for those markets, and enjoying the flexibility to let engineering resources in one region support others when they are overloaded.
Carney, Dan
Magazine Article
Simplified Porous Panel Subsystem for SEA Modeling2003-01-153805/05/2003
Typical Statistical Energy Analysis (SEA) plate/shell subsystems usually assume that the panel is impervious to airflow. However, they are not capable of modeling a trim element or similar component that allows air to pass through it, e.g., a headliner or package tray. The theory of a simplified porous panel is presented for the coupling loss factors of a cavity-panel-cavity connection and the theoretical prediction is compared to measurements for various airflow resistance values. A discussion on the use of the porous panel subsystem for automotive SEA modeling is presented.
Unglenieks, Robert J., Mealman, Marvin R.
Technical Paper
HEADLINING AS AFFECTED BY DESIGN AND STYLING REQUIREMENTS56030501/01/1956
TERRY, S. L.
Technical Paper
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