This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Improving the Design and Analysis of Commercial Bus Structures Using Vehicle Performance Envelopes
Technical Paper
2020-01-0207
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
A challenge in structural design is the inability to quickly assess how a change in use can affect the structural performance of the system. This is particularly important in the bus industry where there is often multiple variations of one base product type for many customers. Thus for a single design there can be frequent changes to mission profiles or customer constraints, which must be considered within short time periods before production commences for a particular customer. This can often limit full understanding of the structural performance, key structural features or critical failure modes, ultimately limiting the potential for producing buses with minimum structural mass. The proposed method in this paper aims to develop a design tool capable of rapidly informing structural design engineers with respect to the structural limitations of various vehicle components using performance envelopes. Vehicle performance envelopes define the combinations of global vehicle accelerations (lateral, vertical and longitudinal) that cause structural failure of any feature or component included in the envelope. Additionally, envelopes will enable definition of the critical (non-redundant) and redundant structural failure modes for each feature considered, e.g. material yielding, buckling or fatigue. For a section of an integral double-deck bus, this paper will demonstrate how these vehicle performance envelopes can be generated for shell panels, and how interrogation of these envelopes can enable a designer to rapidly identify the non-redundant and redundant loading constraints. In doing so, it is also possible to identify the critical failure modes that could cause failure of structural features, as well as quickly evaluating margins of safety for variable route or passenger loading to highlight particular structural features that may fail. This rapid evaluation of structural performance will not only support identification of redundant, or non-critical, components which can potentially be made lighter, but also quantitatively estimate the potential weight saving.
Recommended Content
Authors
Topic
Citation
McIlroy, M., Murphy, A., Quinn, D., and Robinson, T., "Improving the Design and Analysis of Commercial Bus Structures Using Vehicle Performance Envelopes," SAE Technical Paper 2020-01-0207, 2020, https://doi.org/10.4271/2020-01-0207.Also In
References
- Jain , R. , Tandon , P. , and Vasantha Kumar , M. Optimization Methodology for Beam Gauges of the Bus Body for Weight Reduction Applied and Computational Mechanics 8 47 62 2014
- Lan , F. , Chen , J. , and Lin , J. Comparative Analysis for Bus Side Structures and Lightweight Optimisation Proceedings of the Institution of Mechanical Engineers 218 D 1067 1075 2004
- Kunakron-ong , P. , Ruangjirakit , K. , and Jongpradist , P. Design and Analysis of Electric Bus Structure in Compliance with ECE Safety Regulations 2nd IEEE International Conference on Intelligent Transportation Engineering 2017
- Butdee , S. and Vignat , F. TRIZ Method for Light Weight Bus Body Structure Design Journal of Achievements in Materials and Manufacturing Engineering 31 2 456 462 2008
- Prasannapriya , C. and Venugopal Rao , L. A New Design and Analysis of Bus Body Structure IOSR Journal of Mechanical and Civil Engineering 11 5 39 47 2014
- Pine , T. , Lee , M. , and Jones , T. Weight Reduction in Automotive Structures - An Experimental Study on Torsional Stiffness of Box Sections Proceedings of the Institution of Mechanical Engineers 213 D 59 71 1999
- Sangeeth , N. and Mukherjee , A. Optimization of Bus Body Structure Altair Technology Conference 2017
- Sriharsha , S. , Dharmasaroja , A. , Armstrong , C. , Robinson , T. et al. Calculating Implicit Reserve Factor Sensitivities from Performance Envelopes AIAA Structures, Structural Dynamics, and Materials Conference 2018
- Dharmasaroja , A. 2015
- McGuinness , S. 2011
- Chen , Y.Z. , Lee , Y.Y. , Li , Q.S. , and Guo , Y.J. Concise Formula for the Critical Buckling Stresses of an Elastic Plate Under Biaxial Compression and Shear Journal of Constructional Steel Research 65 1507 1510 2009
- Polyak , B.T. Newton’s Method and its Use in Optimization European Journal of Operational Research 181 1086 1096 2007
- Zwicker , M. and Gotsman , C. Meshing Point Clouds Using Spherical Parameterization Proceedings of the First Eurographics Conference on Point-Based Graphics 2004 173 180
- Shewchuk , J. 1997
- Dharmasaroja , A. , Armstrong , C.G. , Murphy , A. , and Robinson , T. Load Case Characterization for the Aircraft Structural Design Process AIAA Journal 55 8 2783 2792 2017