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 theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2016 SAE InternationalAll rights reserved. No part of this publi
3、cation 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.TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)Tel: +1 724-776-4970 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/J3044_201608SURFACE VEHICLERECOMMENDED PRACTICEJ3044 AUG2016Issued 2014-06Revised 2016-08Supe
5、rseding J3044 JUN2014Occupant Restraint and Equipment Mounting Integrity -Rear Impact Ambulance Patient CompartmentRATIONALEThis revision updates the titling to eliminate the term “System-Level” from the document. It adds a reference to SAE J1727 in Section 2.1.1 and corrects a requirement to utiliz
6、e SAE J211-2 rather than SAE J211-1 Section 6, Photographic Instrumentation. Further, it expands Section 4 to allow component-level testing in addition to system-level testing to be consistent with changes made to SAE J2418.1. SCOPEThis SAE Recommended Practice describes the test procedures for cond
7、ucting rear impact occupant restraint and equipment mounting integrity tests for ambulance patient compartment applications. Its purpose is to describe crash pulse characteristics and establish recommended test procedures that will standardize restraint system and equipment mount testing for ambulan
8、ces. Descriptions of the test set-up, test instrumentation, photographic/video coverage, and the test fixtures are included.2. REFERENCES2.1 Applicable DocumentsThe following publications form a part of the specification to the extent specified herein. Unless otherwise indicated, the latest revision
9、 of SAE publications shall apply.2.1.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.SAE J211-1 Instrumentation for Impact Test - Part 1: Electronic Instrume
10、ntationSAE J211-2 Instrumentation for Impact Test - Part 2: Photographic InstrumentationSAE J1727 Calculation Guidelines for Impact TestingSAE Engineering Aid 23 “Users Manual for the 50th-Percentile Hybrid-III Test Dummy,” June 1985SAE INTERNATIONAL J3044 AUG2016 Page 2 of 42.2 Related Publications
11、The following publications are provided for information purposes only and are not a required part of this SAE Technical Report.Code of Federal Regulations, Title 49, Part 571.208.Code of Federal Regulations, Title 49, Part 571.214.Code of Federal Regulations, Title 49, Part 572Current, R., Moore, P.
12、, Green, J., Yannaccone, J., et. al., “Crash Testing of Ambulance Chassis Cab Vehicles”, SAE Technical Paper 2007-01-4267 2007, doi: 10.4271/2007-01-4267CAPE Report CTR07376 - Type III Ambulance Rear Impact, NTIS Accession Number PB2014101523CAPE Report CTR07872 - Type II Ambulance Rear Impact, NTIS
13、 Accession Number PB20141015243. ANTHROPOMORPHIC TEST DEVICESFor the dynamic tests described in the following sections, restraint systems should be evaluated with the aid of anAnthropomorphic Test Device (ATD). The ATD should be of a type that will closely represent the size, weight, and articulatio
14、n characteristics of a 50th percentile male in a seated position. Examples of such an ATD include the Hybrid-III and Euro SID2 with rib extensions 50th percentile male ATD. The ATD should be selected appropriately based on the orientation of the seat relative to the direction of travel and the purpo
15、se of the test. The physical characteristics of theseATDs are described in 49 CFR 572 subparts E and U.Applicable measurement capabilities of the Hybrid-III 50th percentile male ATD are described in 49 CFR 571.208 and applicable measurement capabilities of the Euro SID2-re 50th percentile male ATD a
16、re described in 49 CFR 571.214.ATDs of other sizes (i.e., 95th-percentile male, 5th-percentile female, etc.) may be used to evaluate restraint system performance for various occupant sizes.4. DYNAMIC SLED TESTSFor component-level restraint system tests, only the subject seat or patient cot, and asso
17、ciated restraint system hardware are installed on the test sled fixture. No other patient compartment components need to be installed on the test sled fixture. Proper restraint anchorage geometry, relative to the seat or patient cot, should be maintained. Tethers should be set according to the manuf
18、acturers specifications. The primary purpose of component-level testing is to evaluate seat or patient cot structural integrity, restraint component performance and occupant excursion when subjected to vehicle deceleration from a representative rear impact crash pulse. Component-level testing is als
19、o appropriate to evaluate equipment mounting system integrity and cabinet content retention.For system-level restraint system tests, all interior patient compartment components that are potential occupant contact surfaces (cabinets, countertops, patient cots) shall be installed on the test sled wher
20、e practical. Proper geometry relative to the components being tested should be maintained. Wherever practicable, actual production components should be used.If not, components with performance characteristics near those expected for production should be used. Seat or patient cot tethers should be se
21、t according to the manufacturers specifications. The primary purpose of system-level testing is to evaluate restraint system performance, seat or patient cot structural integrity, occupant excursion, equipment mounting integrity, and occupant interaction with interior components when subjected to a
22、representative rear impact crash pulse.4.1 Test FixtureFor the rear impact tests, a sled fixture mounted on a uni-directional tracking system is required. Typical sled fixture systems are of the deceleration and acceleration types. For the deceleration system, the sled fixture is accelerated to a de
23、sired speed and then decelerated through the programmed pulse via energy-absorbing methods (i.e., honeycomb, extruded steel rods, etc.). For the acceleration system, the programmed pulse is applied as a rearward acceleration to the sled fixture, which is initially at rest.SAE INTERNATIONAL J3044 AUG
24、2016 Page 3 of 44.2 Rear Impact Sled Pulse SpecificationFor rear impact tests, a sled deceleration pulse is applied parallel to the vehicle longitudinal axis. The pulse profile must fall within the corridor delineated by the plots in Figure 1 and the values in Table 1. Total velocity change during t
25、he test shall be 10 0.5 mph.Figure 1 - Dynamic sled corridorTable 1 - Dynamic sled corridor break pointsPosition Time(sec) Acceleration (g) Position Time(sec) Acceleration (g)A 0.00 -3.0 F 0.01 0.0B 0.02 -11.0 G 0.025 -7.0C 0.06 -11.0 H 0.05 -7.0D 0.07 -3.0 I 0.06 0.0E 0.10 -3.04.3 Anthropomorphic T
26、est Device (ATD) PositioningATD positioning procedures for this testing should be consistent with the positioning procedures outlined in 49 CFR 571.208 and 49 CFR 571.214, where practicable.AB CD EFG HI-12.0-10.0-8.0-6.0-4.0-2.00.00.000 0.010 0.020 0.030 0.040 0.050 0.060 0.070 0.080 0.090 0.100Acce
27、lerationGTime (sec)SAE INTERNATIONAL J3044 AUG2016 Page 4 of 45. INSTRUMENTATIONTo record the deceleration pulse, accelerometers may be mounted to the sled fixture. ATD instrumentation may include any of the measurements mentioned in Section 3. Dynamic seat belt loads may be recorded by installing w
28、ebbing load transducers on the seat belts. All measurements should be recorded, filtered and processed according to the most recent versions of SAE J211-1 and SAE J1727.6. PHOTOGRAPHIC INSTRUMENTATIONHigh-speed cameras should be used to document the dynamic tests. The field of view of these cameras
29、should be large enough to document the entire range of motion of the ATD and/or mounted equipment during the deceleration event. Wherever possible, off-board cameras should be used to allow for the use of longer focal-length lenses and, therefore, less lens distortion error when performing analysis
30、of the high-speed footage.If complete coverage of occupant kinematics is not possible with off-board cameras only, the use of on-board cameras will be required.Each high-speed camera should operate at a frame rate sufficient to facilitate motion analysis of the film. A minimum frame rate of 500 fram
31、es per second is recommended. Sufficient reference targets, both stationary and on the test sled/fixture and ATD, should be provided. Provisions should be made for synchronizing electronic and photographic instrumentation. Wherever possible, the cameras should be mounted such that they are perpendic
32、ular to the axis of motion. All video should be captured and processed according to the most recent version of SAE J211-2.7. NOTES7.1 Revision IndicatorA change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, h
33、ave been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.PREPARED BY THE SAE TRUCK CRASHWORTHINESS COMMITTEE OF THE SAE TRUCK AND BUS BODY AND OCCUPANT ENVIRONMENT STEERING COMMITTEE
