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 ther
2、efrom, 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 International All rights reserved. No part of this
3、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: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (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/J2779_201507 SURFACE VEHICLE RECOMMENDED PRACTICE J2779 JUL2015 Issued 2007-01 R
5、evised 2015-07 Superseding J2779 JAN2007 Low Speed Thorax Impact Test Procedure for the HIII 50th Male Dummy RATIONALE Sections 2.1, 2.1.1, 2.2, 3.1.c wording changes to properly reference SAE and SAE documents. Section 2.1.1 changed EA-23 to SAE J2856. Section 3.1.a change “vest and panty” to “shir
6、t and pants”. Section 3.1.c correct references to SAE J211-1 and SAE J2527 latest versions as Recommended Practices. Section 3.1.c change filter class for chest deflection from CFC180 to CFC600 to conform to latest SAE recommendations and to be consistent with SAE J2856. Section 3.2.a, 3.2.d, 3.2.f
7、(2 places), 3.2.g (3 places), 3.2.h change “chest skin” to “chest flesh”. Section 3.2.d change “panty” to “pants”. Figure 1 Fix probe mass and edge radius to match section 3.1.b. TABLE OF CONTENTS 1. SCOPE AND PURPOSE . 2 2. REFERENCES . 2 2.1 Applicable Documents . 2 2.2 Related Publication 2 3. CA
8、LIBRATION PROCEDURE . 2 3.1 Preparation . 2 3.2 Test Procedure . 3 3.3 Performance Specifications . 4 4. NOTES . 5 4.1 Marginal Indicia 5 Figure 1 Test set-up specifications . 4 Figure 2 Hysteresis definition . 5 SAE INTERNATIONAL J2779 Revised JUL2015 Page 2 of 5 1. SCOPE AND PURPOSE This procedure
9、 establishes a recommended practice for performing a Low Speed Thorax Impact Test to the Hybrid III 50th Male Anthropomorphic Test Device (ATD or crash dummy). This test was created to satisfy the demand by the industry to have a calibration test which resulted in similar results to an actual low en
10、ergy automotive impact test. An inherent problem exists with the current calibration procedure because the normal (6.7 m/s) thorax impact test has test corridors that are not representative to these low energy impact tests. The normal test corridors specify a displacement range of around 68 mm and t
11、he low speed displacement corridor needs to be around 25 mm. The intent of this recommended practice is to develop a low speed thorax calibration procedure for the H-III50M dummy in 25 to 30 mm deflection range. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this sp
12、ecification 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, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside
13、USA), www.sae.org. SAE J2856 Users Manual for the 50th Percentile Male Hybrid III Test Dummy SAE J2517 Hybrid III Family Chest Potentiometer Calibration Procedure SAE J211/1 Instrumentation for Impact Test - Part 1 - Electronic Instrumentation 2.2 Related Publication The following publications are p
14、rovided for information purposes only and are not a required part of this SAE Technical Report. 2.2.1 Federal Publication Available from the Superintendent of Documents, U.S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-9320. Motor Vehicle Regulation No. 572 Test Dummies Specifi
15、cations - Anthropomorphic Test Dummy for Applicable Test Procedures 3. CALIBRATION PROCEDURE 3.1 Preparation a. The complete dummy assembly (78051-218) is required, including the clothing shirt and pants, but without the shoes (78051-294 left and 78051-295 right). b. The fixture consists of a smooth
16、, clean, dry, steel seating surface and a test probe. The test probe is a 152.4 0.25 mm (6.0 0.01 in) diameter rigid cylinder with a mass of 23.36 0.02 kg (51.5 0.05 lb), including instrumentation, rigid attachments, and the lower 1/3 of the suspension cable mass. The impacting surface has a flat, r
17、ight angle face with an edge radius of 12.7 0.3 mm (0.5 0.01 in). Mount an accelerometer to the probe with its sensitive axis in line with the longitudinal centerline of the test probe. SAE INTERNATIONAL J2779 Revised JUL2015 Page 3 of 5 c. The data acquisition system, including transducers, must co
18、nform to the specifications of the latest revision of SAE Recommended Practice J211-1. Filter pendulum force using a Channel Class 180 phaseless filter and chest deflection using a Channel Class 600 phaseless filter. Calibrate the chest deflection transducer using SAE Recommended Practice J2517. 3.2
19、 Test Procedure a. Remove the chest flesh and visually inspect the thorax assembly for cracks, cuts, abrasions, etc. Pay particular attention to the rib damping material, chest displacement transducer assembly, and the rear rib supports. Torque the spine cables to 1.2-1.4 Nm (10-12 in-lbf). b. Soak
20、the test dummy in a controlled environment with a temperature of 20.6 to 22.2 C (69 to 72 F) and a relative humidity from 10 to 70 percent for at least four hours prior to the test, until the rib temperature has reached the soak temperature. The test environment should have the same temperature and
21、humidity requirements as the soak environment. c. Check that all transducers are properly installed, oriented, and calibrated. d. Seat the dummy (without the chest flesh but with the pants) on the test fixture surface. The surface must be long enough to support the pelvis and outstretched legs. e. A
22、lign the upper and lower neck bracket index marks to the zero position. f. Place the arm assemblies horizontal ( 2) and parallel to the midsagittal plane. Secure the arms by tightening the adjustment nut which holds the arm yoke to the clavicle assembly. If necessary, prop the arms up with a rod tha
23、t will fall away during the test. Level the ribs both longitudinally and laterally 0.5 and adjust the pelvis angle to 13 2. (Use the special tool which inserts into the pelvic structure and extends outward beyond the pelvic skin surface. The tool permits the use of an angle measurement device to det
24、ermine the pelvis angle.) The midsagittal plane of the dummy is vertical 1 and within 2 of being parallel to the centerline of the test probe. The longitudinal centerline of the test probe is centered on the midsagittal plane of the dummy within 3 0.25 mm. Align the test probe so its longitudinal ce
25、nterline is 12.7 1 mm below the horizontal centerline of the No. 3 rib and is within 0.5 of a horizontal line in the dummys midsagittal plane. After completing the initial setup, record reference measurements from locations such as the rear surfaces of the thoracic spine and the lower neck bracket.
26、These reference measurements are necessary to ensure that the dummy remains in the same position after installing the chest flesh. When using a cable-supported test probe, the dummy must be moved rearward from the test probe to account for the thickness of the chest flesh, so the probe will impact a
27、t the lowest point on its arc of travel. The test setup appears in Figure 1. g. Install the chest flesh and shirt and reposition the dummy as described in the preceding paragraph using the recorded reference measurements. The reference locations must be accessible after installation of the chest fle
28、sh, so it may be necessary to leave the chest flesh unzipped until the references are checked, and then fasten it just prior to the test. h. Impact the thorax with the test probe so the probes longitudinal centerline is within 2 of a horizontal line in the dummys midsagittal plane at the moment of i
29、mpact. Guide the probe so no significant lateral, vertical or rotational motion takes place during the impact. The test probe velocity at the time of impact is 3.00 m/s 0.06 m/s. Time-zero is defined as the time of initial contact between the test probe and the chest flesh. All data channels should
30、be at the zero level at this time (after processing to Engineering Units). Wait at least 30 minutes between successive tests on the same thorax. SAE INTERNATIONAL J2779 Revised JUL2015 Page 4 of 5 3.3 Performance Specifications The maximum sternum-to-spine deflection, as measured by the chest displa
31、cement transducer should lie between 21.5 and 26.5 mm. The maximum force applied to the thorax by the test probe should measure between 2.38 and 2.73 kN. The internal hysteresis ratio should be greater than 60 percent but less than 75 percent. The hysteresis ratio, determined from the force vs. defl
32、ection curve, is the ratio of the area between the loading and unloading portions of the curve to the area under the loading portion of the curve. See Figure 2 for details. Figure 1 - Test set-up specifications 23.36 0.02 kg (51.5 0.05 lb) 12.7 0.3 mm (0.50 0.01 in) SAE INTERNATIONAL J2779 Revised J
33、UL2015 Page 5 of 5 Figure 2 - Hysteresis definition 4. NOTES 4.1 Marginal Indicia A change bar (l) located in the 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 AND EQUIPMENT COMMITTEE
