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Catalytic Converter Design from Mat Material Coupon Fragility Data
Technical Paper
2004-01-1760
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Automotive catalytic converters must provide a very high level of mechanical and thermal durability to maintain performance during their 100,000 to 150,000 mile life expectancy. The work reported herein characterizes the converter as a base (can) excited spring (mat material) supported mass (substrate). A mat material coupon test apparatus was developed for the purpose of providing parameter data for the converter model in the form of stiffness and material loss factor data as a function of shear deflection across the mat. An intumescent mat material was chosen and its dynamic properties evaluated for a range of converter operating parameters. The mat material response properties were placed into a mat material database as a function of gap bulk density, substrate temperature, and temperature gradient across the mat. A series of canned converters employing the intumescent mat were then tested to provide frequency response data for comparison to corresponding predictions employing the mat material database and a proposed converter model.
It was found that the mat material exhibited a non-linear response with respect to shearing deformation exhibiting decreased stiffness and increased loss factor with increased shearing deformation. However, the mat material non-linear behavior could be adequately represented using a linearized single-degree-of-freedom (SDOF) system representation about the system resonant frequency. This research effort has resulted in new mat material test and converter design procedures to meet component extended life requirements.
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Citation
Unruh, J. and Till, P., "Catalytic Converter Design from Mat Material Coupon Fragility Data," SAE Technical Paper 2004-01-1760, 2004, https://doi.org/10.4271/2004-01-1760.Also In
Diesel Emissions on CD-ROM from the SAE 2004 World Congress
Number: SP-1835CD; Published: 2004-03-08
Number: SP-1835CD; Published: 2004-03-08
References
- Unruh, J.F. Fox, D.J. Locker, R.J. Sawyer, C.B. “Catalytic Converter Mat Material Durability Measurement Under Controlled Thermal and Vibration Environments,” SAE Paper 2000-01-0221 , World Congress Detroit, Michigan March 6-9 2000
- Unruh, J.F. Locker, R.J. Sawyer, C.B. “The Effect of Environmental Aging on Intumescent Mat Material Durability at Low Temperatures,” SAE Paper 2002-01-1099 , World Congress Detroit, Michigan March 4-7 2002
- Unruh, J.F. Till, P.D. Locker, R.J. Sawyer, C.B. “Diesel Engine Exhaust Thermal and Vibration Mapping,” SAE 2004
- Fox, D.J. Unruh, J.F. “Vibration Characterization of Intumescent Mat Mounted Ceramic Preconverters,” SAE Paper 980051 , International Congress and Exposition Detroit, Michigan February 23-26 1998
- Stoker, J.J. Nonlinear Vibrations in Mechanical and Electrical Systems Interscience Publishers New York 1963