SAE-J89-2007.pdf
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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2007 SAE International All rights reserved. No part of this publication m
3、ay 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. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、 Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org J89 REV. APR2007 SURFACE VEHICLE RECOMMENDED PRACTICE Issued 1973-07 Revised 2007-04 Superseding J89 JUN1995 Dynamic Cushioning Performance Criteria for Snowmobile Seats RATIONALE Five year review. Document format pr
5、eviously updated. Changes: 1.1 Purpose: Deleted obsolete reference to SAE J89a 1.2 Contents: Added Section 6 Notes 2.1.1 SAE Publications; Corrected title of J33 4.2.5 Removed abbreviation; Changed h to hours 1. SCOPE This SAE Recommended Practice encompasses the significant factors which determine
6、the effectiveness of a seat system in limiting spinal injury during vertical impacts between the rider and the snowmobile seat system. The document is intended to provide a tool for the development of safer snowmobile seats. It is recognized that the seat is only a portion of the entire vehicle prot
7、ective suspension system. It is, however, usually required that the seat serve as added protection to the suspension system, since the latter may “bottom out“ during a severe impact. The term “seat“ refers to the occupant-supporting system not normally considered part of the vehicle suspension or fr
8、ame system. In some cases, it may include more than the foam cushion. This document provides the minimum requirements for performance of a general seat system, and a description of specific means of evaluating the shock-absorbing characteristics of foam seat cushions using a specific testing procedu
9、re and a companion seat evaluation chart. The test input and means of interpreting the results are unique to the seats of typical recreational snowmobiles. Therefore, this document is to be used for snowmobile seats only and is not to be used to evaluate seats of any other type of vehicle. In additi
10、on, it should not be applied to seats of snow vehicles of significantly different design, dimensions, construction, or intended usage from the typical recreational snowmobile illustrated in SAE J33. 1.1 Purpose The purpose of this document is to facilitate the development of seats used on snowmobile
11、s to minimize occupant spinal injury during impacts of: a. The occupant on the snowmobile seat b. The snowmobile and seat on the occupant Operators and passengers of snowmobiles can be subjected to high levels of impact with the snowmobile seat under riding conditions. This document was developed to
12、 identify the cushioning properties of snowmobile seats. -,-,- SAE J89 Revised APR2007 - 2 - 1.2 Contents Section 1Scope Section 2Reference Section 3Definitions Section 4Testing Method Section 5Evaluation Section 6Notes 2. REFERENCE 2.1 Applicable Publication The following publication forms a part o
13、f this specification to the extent specified herein. The latest issue of SAE publication shall apply. 2.1.1 SAE Publication Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J33 Definitions
14、 for Snowmobiles 3. DEFINITIONS 3.1 Snowmobile Seat The seat includes the cover, energy-absorbing materials, and substrates (if any). 3.2 Baseline The baseline is the starting reference plane of the seat from which total penetration is determined. It is taken as the top plane of the seat at the fore
15、-aft position designated for the snowmobile occupant(s). 3.3 G Symbol for the dimensionless ratio of any acceleration to the acceleration of gravity. 3.4 tp Time duration impact to peak deceleration, in milliseconds. 3.5 th Time duration from impact to 1/2 value of peak deceleration, in milliseconds
16、. 4. DYNAMIC CUSHIONING TESTING METHOD 4.1 Scope This procedure provides a uniform method for measuring, with a high degree of reproducibility, dynamic cushioning properties such as the deceleration-time history profile of a standard buttocks form (“missile“) impacting seat test specimens. The resul
17、ts from this testing method can be related to the performance requirements necessary to limit spinal injury to snowmobile riders and passengers. SAE J89 Revised APR2007 - 3 - 4.2 Apparatus 4.2.1 Testing Machine Any design of dynamic testing apparatus will suffice when the following criteria are met.
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