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Body-in-White Joint Stiffness Sensitivity Analysis
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 08, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Event: Automotive Technical Papers
The major objectives of a car design are reducing costs, maximizing performance, and improving fuel economy. The total mass of a car has a direct effect on all these objectives. Around 25% of the total mass of a car is typically accumulated in its body in white (BIW). Thus, reducing the total mass of the BIW while satisfying the target stiffness is of utmost importance in the early stages of design. Reducing the total mass of the BIW involves the identification of potential locations for mass reduction and stiffness improvement. The joints of the BIW are often the most critical locations that decide the overall stiffness of the BIW. Understanding the contribution of each joint toward the overall stiffness is thus of paramount importance toward improving the stiffness of the BIW.
This paper describes a new approach of identifying the contribution of each joint in a BIW toward the overall stiffness of the BIW. The joints in the BIW are parametrized and Altair Optistruct  tool is used to find optimum value of each parameter. The contribution of different joints to the overall stiffness is different for different loads. This methodology was applied to a simplified BIW model for a combination of two load cases-static torsion and bending. The relative joint sensitivities of the joints in BIW have been identified and verified based on the results. The entire methodology has also been automated in a preprocessor to reduce the total time involved.
- Abhishek Ramachandran - National Institute of Technology Karnataka (NITK)
- Hemanjaneya Reddy - Mercedes-Benz Research and Development India
- Tanuja Chavali - Mercedes-Benz Research and Development India
- Ajay Hukar - Mercedes-Benz Research and Development India
- Jayasankar Somasekharan - Mercedes-Benz Research and Development India
CitationRamachandran, A., Reddy, H., Chavali, T., Hukar, A. et al., "Body-in-White Joint Stiffness Sensitivity Analysis," SAE Technical Paper 2019-01-5012, 2019, https://doi.org/10.4271/2019-01-5012.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Altair Optistruct solver tool, https://altairhyperworks.com/product/Optistruct.
- Matsuyama, S. and Yamashita, H. , “Development of Smart Design Process for Light Weight Body in White,” SAE Int. J. Mater. Manf. 8(2):554-562, 2015, doi:10.4271/2015-01-1365.
- http://www.iberisa.com/ -Modal Analysis done with FEMAP and NX NASTRAN using Siemens iberisa tool.
- Patil, S., Vishnu, S., and Jain, R. , “Joint Sensitivity Process Using Equivalent Static Loads on Concept BiW Model,” presented at Altair Technology Conference, 2017.
- Gaeta, A., La Monaca, A., and Frascá, F. , “A Combined Optimization of Automotive Body Joints,” SAE Technical Paper 2003-01-2797 , 2003, doi:10.4271/2003-01-2797.
- Song, Y., Flanigan, D., Rivard, C., Shahidi, B. et al. , “A New FEA Method for the Evaluation of a Body Joint,” SAE Technical Paper 2001-01-0758 , 2001, doi:10.4271/2001-01-0758.
- Kiani, M. and Farahani, A. , “Joint Stiffness Optimization and Sensitivity in Thin Gauge Study” presented at Great Designs in Steel 2014, 2014.
- Altair documents used for internal training of C123 tool (shared for internal use only).
- ANSA preprocessing Tool -https://www.beta-cae.com/ansa.htm.
- https://www.altairatc.com/india/previous-events/atc/2017/2017- Technical-Papers.htm- Altair Technology Conference India 2017- Title-Joint Sensitivity Process Using Equivalent Static Loads on Concept BIW Model-By Tata Technologies.