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.
Catalytic Converter Design from Mat Material Coupon Fragility Data
Sae Technical Papers
SAE 2004 World Congress & Exhibition ; 2004
2004-03-08
Conference paper
English
Catalytic converter design from mat material coupon fragility data
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