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Green, Edward R.
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Application of the Modal Compliance Technique to a Vehicle Body in White

DaimlerChrysler Corporation-Kuang-Jen Liu
Roush Industries, Inc.-David Griffiths, Edward R. Green
Published 2007-05-15 by SAE International in United States
This paper describes the application of the modal compliance method to a complex structure such as a vehicle body in white, and the extension of the method from normal modes to the complex modes of a complete vehicle. In addition to the usual bending and torsion calculations, the paper also describes the application of the method to less usual tests such as second torsion, match-boxing and breathing. We also show how the method can be used to investigate the distribution of compliance throughout the structure.
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A Comparison of the Effectiveness of Elastomeric Tuned Mass Dampers and Particle Dampers

Roush Industries, Inc.-Allan C. Aubert, Edward R. Green, Gregory Z. Chen
Published 2003-05-05 by SAE International in United States
This paper presents a study and comparison of two methods commonly used to treat unwanted vibration in vehicles. Laboratory work was done to measure and compare the effectiveness of common designs for practical tuned mass dampers (TMDs) and particle dampers under a wide range of conditions. The relative strength and weaknesses of the two approaches are compared in their abilities to treat vibration in a system due to resonant modes and forced response. The effectiveness of each method is investigated as a function of the weight of the treatment, amplitude and temperature effects.
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A Technique for Relating Vehicle Structural Modes to Stiffness as Determined in Static Determinate Tests

Roush Industries-David Griffiths, Allan Aubert, Edward R. Green, Jim Ding
Published 2003-05-05 by SAE International in United States
During the development of a new vehicle, the vehicle is usually tested to determine both its static torsional and bending stiffness, and its dynamic torsional and bending modes. This paper discusses a method for determining both static and dynamic properties from the modal analysis test. Such a connection between static stiffness and dynamic modes would be useful for three reasons: (1) the relative importance of apparent bending and torsion modes could be determined by their contribution to stiffness, (2) the stiffening effect of structural modifications could be determined from experimental modal tests (the modal frequency shift is also affected by any change in mass), (3) the total static compliance could easily be split on a modal basis into compliance due to the overall structure and local compliance due to local structural deflections.
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Assessing Headliner and Roof Assembly Acoustics

Ford Motor Co.-Richard E. Wentzel
Roush Anatrol-Edward R. Green
Published 1997-05-20 by SAE International in United States
Although automotive headliners are primarily designed for their aesthetic qualities, technical experts realize that they play a significant role in affecting the acoustics in the cab of the vehicle. This paper suggests that the roof sheet metal and headliner perform as an assembly system, and explores how the acoustical attributes of that system, including the sound absorption, sound transmission loss and damping, can be assessed in the acoustics laboratory. New test methodologies and devices are introduced, and a wide variety of headliner and roof assembly designs are tested.
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