400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2007-01-2357 Development of an Optimal Design Program for Vehicle Side Body Considering the B.I.W. Stiffness and Light Weight Yun Ki You, Hong Jae Yim and Chan Muk Kim Kookmin University Ki Chang Kim Hyundai Motor Company Noise and Vibration Conference and Exhibition St. Charles, Illinois May 15-17, 2007Downloaded from SAE International by Univ of California Berkeley, Sunday, August 05, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under th e supervision of the session organi zer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028 Fax: 724-776-3036 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: [email protected] ISSN 0148-7191 Copyright © 2007 SAE International Positions and opinions advanced in this paper are those of the author(s ) and not necessarily those of SAE. The author is solely responsible for the content of th e paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publicat ion by SAE should send the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Sunday, August 05, 2018ABSTRACT In the primary design step, a well established design guide would be useful for vehicle body design engineers, to avoid trial and error for the desired design. In this paper, an integrated design program B-SOPT is presented. The B-SOPT is composed of vibration analysis, section property analysis, and section optimization. Vibration analysis procedure is necessary to evaluate the target frequency constraints for optimization. B.I.W. vibration analysis model can be generated and joint stiffness can also be generated automatically by explicit formula derived from using RSM (Response surface method) in the B-SOPT. The presented design program provides a systematic design guide for the vehicle side body structure. For design engineers, graphic user interface environment is developed with the visual C++ program. A B.I.W design example is given to demonstrate the design procedure using the B-SOPT program. INTRODUCTION Recently the R&D trend of the advanced automobile company is to invest plenty of cost and time in a period of the primary development for the reduction of vehicle development period by minimizing the design change process during the test and evaluation of prototype vehicle through well structured primary development process. Primary development process contains the concept design and the detail design. Detail design is conducted by the computer with the commercial design programs. The detail design process is based on the initial concept design model. Therefore, it is necessary to establish a proper design guide for the concept design. In this study an integrated design procedure is proposed to develop an optimal design program for vehicle side body structure, which can be applied for the concept design step in order to ensure a high stiffness and light weight of vehicle body. Side body structures of the vehicle B.I.W. consist of thin walled beam structures. Therefore, in order to design a high stiffness a