1、 SURFACE VEHICLE RECOMMENDED PRACTICE J2876 MAY2015 Issued 2009-03 Revised 2015-05 Superseding J2876 MAR2009 Low Speed Knee Slider Test Procedure for the Hybrid III 50thMale Dummy RATIONALE Update page headers to standard SAE formats Section 2.1.1 Changed reference from “SAE EA-23” to “SAE J2856” Se
2、ction 3.1.c Changed reference from “J211” to “J211/1” Section/Paragraph 4.1 Changed the text of “by the SAE Dummy Testing Equipment Subcommittee of the SAE Human Biomechanics and Simulation Standards Committee” to “Prepared by the SAE Dummy Testing Equipment Standards Committee” TABLE OF CONTENTS 1.
3、 Scope . 2 1.1 Purpose 2 2. References . 2 2.1 Applicable Documents . 2 2.2 Related Publication 2 3. Certification procedures . 2 3.1 Preparation . 2 3.2 Instrumentation Specifications . 3 3.3 Test Procedure . 4 3.4 Performance Specifications . 4 4. Notes 5 4.1 Marginal Indicia 5 Figure 1 Knee slide
4、r test setup . 3 Table 1 Drop height table 4 _ 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, in
5、cluding any patent infringement arising therefrom, 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 2015 SAE Interna
6、tional 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. TO PLACE A DOCUMENT ORDER: Tel: 877-606-732
7、3 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2876_201505 SAE INTERNATIONAL J2876
8、 Revised MAY2015 Page 2 of 5 1. SCOPE This procedure establishes a recommended practice for performing a Low Speed Knee Slider test to the Hybrid III 50th Male Anthropomorphic Test Device (ATD or crash dummy). This test was created to satisfy the demand from industry to have a certification test whi
9、ch produces similar results to an actual low energy automotive impact test. An inherent problem exists with the current certification procedure because the normal (2.75 m/s) knee slider test has test corridors that do not represent typical displacements seen in these low energy impact tests. The nor
10、mal test corridors specify a force requirement at 10 mm and at 18 mm, while the low speed test needs to have a peak displacement around 10 mm. 1.1 Purpose The intent of this recommended practice is to develop a low speed knee slider test procedure for the H-III50M dummy with a 10 mm deflection range
11、. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrend
12、ale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J2856 Users Manual for the 50th Percentile Male Hybrid III Dummy SAE J211/1 Instrumentation for Impact Test - Part 1 - Electronic Instrumentation 2.2 Related Publication The following pub
13、lication is provided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 Federal Publication Copies of these documents are available online at http:/quicksearch.dla.mil. Motor Vehicle Regulation No. 572 Test Dummies Specifications - Anthropomorphic Test Dumm
14、y for Applicable Test Procedures 3. CERTIFICATION PROCEDURES 3.1 Preparation a. The components required for the knee slider test are: Left or right knee assemblies with ball bearing knee sliders (79051-201 left knee assembly; 79051-202 right knee assembly) Displacement transducer (79051-229 left kne
15、e potentiometer; 79051-230 right knee potentiometer) NOTE: Knee flesh (78051-5 / 78051-6) is not to be used for this test. SAE INTERNATIONAL J2876 Revised MAY2015 Page 3 of 5 b. The test fixture consists of a rigid test probe and a method of rigidly supporting the knee assembly. The test probe mass
16、is 12.000 kg 0.020 kg (26.460 lb 0.044 lb), including instrumentation, rigid attachments and the lower 1/3 suspension cable mass. The diameter of the impacting face is 76.20 mm 0.25 mm (3.00 in 0.01 in) with an edge radius of 0.5 mm (0.02 in). A load distribution bracket is required to transmit the
17、impact energy into the slider assembly, as seen in Figure 1. NOTE: The Ensolite pad is closed cell foam that can be damaged by impact and age. The pad should be regularly inspected and replaced if there are signs of damage and/or degradation. c. The data acquisition system, including transducers, mu
18、st conform to the specifications of the latest revision of SAE Recommended Practice SAE J211/1. Filter the displacement data channel using Channel Class 180 phaseless filters. 3.2 Instrumentation Specifications 3.2.1 The displacement transducer must have a maximum nonlinearity error no greater than
19、0.16 mm in the displacement range being measured. This may be accomplished with linearization equations if needed. Figure 1 - Knee slider test setup SAE INTERNATIONAL J2876 Revised MAY2015 Page 4 of 5 3.3 Test Procedure 3.3.1 Inspect the knee assembly for damage. Pay particular attention to the left
20、 and right side slider assemblies to ensure that the tracks are free from damage and debris. 3.3.2 Soak the knee assembly in a controlled environment with a temperature between 20.6 C and 22.2 C (69 F to 72 F) and a relative humidity from 10 to 70 percent for at least four hours prior to a test. The
21、 test environment should have the same temperature and humidity requirements as the soak environment. 3.3.3 Check that all transducers are properly installed, oriented, and calibrated. 3.3.4 Mount the knee assembly to the fixture using a femur load cell or load cell replacement. Torque the two mount
22、ing bolts to 40.7 Nm (30 ft-lbf) to prevent slippage of the assembly during impact. Attach the load distribution bracket to the slider assembly. The bracket is attached to the inboard and outboard slider assemblies in the same manner as the knee clevis, so the impacted bracket will slide rearward in
23、 the track. 3.3.5 Align the longitudinal centerline of the test probe so at the time of impact, it is collinear (within 2) with the longitudinal centerline between the load cell and the load distribution bracket. The test probe longitudinal centerline should be horizontal within 0.5. The test setup
24、appears in Figure 1. 3.3.6 Guide the probe so no significant lateral, vertical or rotational motion occurs at the time of contact between the test probe face and the load distribution bracket. 3.3.7 A break-in test before the certification test is permitted as long as the wait time between tests has
25、 elapsed before performing the first certification test. 3.3.8 The test probe velocity at the time of impact is 1.55 m/s 0.02 m/s (5.09 ft/s 0.07 ft/s). Velocity must be measured as close as possible to impact. Table 1 indicates the drop heights for the velocity range. Table 1 - Drop height table Ve
26、locity (m/s) Drop Height (mm) Drop Height (in) 1.57 125.6 4.946 1.55 122.5 4.821 1.53 119.3 4.697 3.3.9 Time-zero is defined as the time of initial contact between the test probe and the load distribution bracket. All data channels should be at zero level at this time. 3.3.10 Wait at least 30 minute
27、s between successive tests on the same knee slider assembly. 3.4 Performance Specifications 3.4.1 The peak knee slider displacement is to be within 11.00 mm 1.67 mm (0.4331 in 0.0657 in). SAE INTERNATIONAL J2876 Revised MAY2015 Page 5 of 5 4. NOTES 4.1 Marginal Indicia A change bar (I) located in th
28、e left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have 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 DUMMY TESTING EQUIPMENT STANDARDS COMMITTEE
