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 2016 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/J2878_201606 SURFACE VEHICLE RECOMMENDED PRACTICE J2878 JUN2016 Issued 2010-01 R
5、evised 2016-06Superseding J2878 JAN2010 Low Speed Thorax Impact Test Procedure for the HIII5F Dummy RATIONALE Section 2.1.1 SAE EA-25 was replaced by SAE J2862. Section 2.2.1 Company name and link replaced with text indicating working link where documents can be obtained. Section 3.3 Change upper li
6、mit of hysteresis corridor from 72 to 79. TABLE OF CONTENTS 1. SCOPE AND PURPOSE . 2 2. REFERENCES . 2 2.1 Applicable Documents . 2 2.1.1 SAE Publications 2 2.2 Related Publication 2 2.2.1 Federal Publication 2 3. CERTIFICATION PROCEDURE . 3 3.1 Preparation . 3 3.2 Test Procedure. 3 3.3 Performance
7、Specifications . 4 4. NOTES . 6 4.1 Revision Indicator . 6 Figure 1 TEST SET-UP SPECIFICATIONS . 5 Figure 2 HYSTERESIS DEFINITION . 6 SAE INTERNATIONAL J2878 JUN2016 Page 2 of 6 1. SCOPE AND PURPOSE This procedure establishes a recommended practice for performing a Low Speed Thorax Impact Test to th
8、e Hybrid III Small Female Anthropomorphic Test Device (ATD or crash dummy). This test was created to satisfy the demand by the industry to have a certification test which results in peak chest deflection similar to current full vehicle, frontal impact tests. An inherent problem exists with the curre
9、nt certification procedure because the normal (6.7 m/s) thorax impact test has test results for peak chest deflection that are greater than those currently seen in full vehicle, frontal tests. The intent of this document is to develop a low speed thorax certification procedure for the H-III5F dummy
10、with a 3.0 m/s impact similar to the SAE J2779 procedure for the H-III50M dummy. 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
11、 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 USA), www.sae.org. SAE J211/1 Instrumentation for Impact Test - Part 1 - Electronic Instrumentation SAE J2517 Hybrid III Family Che
12、st Potentiometer Calibration Procedure SAE J2779 Low Speed Thorax Impact Test Procedure for the HIII 50thMale Dummy SAE J2862 Users Manual for the Small Adult Female Hybrid III Test Dummy 2.2 Related Publication The following publications are provided for information purposes only and are not a requ
13、ired part of this SAE Technical Report. 2.2.1 Federal Publication Copies of these documents are available online at http:/www.ecfr.gov. Motor Vehicle Regulation No. 572 Test Dummies Specifications - Anthropomorphic Test Dummy for Applicable Test Procedures SAE INTERNATIONAL J2878 JUN2016 Page 3 of 6
14、 3. CERTIFICATION PROCEDURE 3.1 Preparation a. The complete dummy assembly (880105-000) is required, including the clothing (t-shirt and pants), but without the shoes (880105-630). b. The fixture consists of a smooth, clean, dry, steel seating surface and a test probe. The test probe is a 152.4 0.25
15、 mm (6.0 0.01 inch) diameter rigid cylinder with a mass of 13.97 0.023 kg (30.80 0.05 pound), including instrumentation, rigid attachments, and the lower 1/3 of the suspension cable mass. The impacting surface has a flat, right angle face with an edge radius of 12.7 0.3 mm (0.5 0.01 inch). Mount an
16、accelerometer to the probe with its sensitive axis in line with the longitudinal centerline of the test probe. c. The data acquisition system, including transducers, must conform to the specifications of the latest revision of SAE Recommended Practice J211/1. Filter pendulum force using a Channel Cl
17、ass 180 phaseless filter and chest deflection using a Channel Class 600 phaseless filter. Calibrate the chest deflection transducer using SAE J2517 Revision September 2006 or later. 3.2 Test Procedure a. Remove the chest flesh and visually inspect the thorax assembly for cracks, cuts, abrasions, etc
18、. Pay particular attention to the rib damping material (880105-358-1 through 880105-358-6), chest displacement transducer assembly (880105-1080), and the rear rib supports (880105-320). Torque the spine cables to 1.13-1.36 Nm (10-12 in-lbf). b. Soak the test dummy in a controlled environment with a
19、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 humidity requirements as the soak environment. c.
20、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. Align the upper and lower neck bracket index marks
21、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 (880105-336, 337). If necessary, prop the arms up with a rod that will fall away during the test
22、. Level the ribs both longitudinally and laterally 0.5 (the reference is the number 3 rib as shown in Figure 1) and adjust the pelvis angle to 7 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 m
23、easurement device to determine 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 mm. Align the test probe so
24、its longitudinal centerline 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 l
25、ower neck bracket. 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
26、probe will impact at the lowest point on its arc of travel. The test setup appears in Figure 1. SAE INTERNATIONAL J2878 JUN2016 Page 4 of 6 g. Install the chest flesh and shirt and reposition the dummy as described in the preceding paragraph using the recorded reference measurements. The reference l
27、ocations must be accessible after installation of the chest flesh, 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 hor
28、izontal line in the dummys midsagittal plane at the moment of impact. 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 0.05 m/s. Time-zero is defined as the time of initial contact betwee
29、n the test probe and the chest flesh. All data channels should 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. 3.3 Performance Specifications The maximum sternum-to-spine deflection, as measured by the c
30、hest displacement transducer should lie between -21.8 and -17.4 mm. The maximum force applied to the thorax by the test probe should measure between -2.07 and -1.78 kN. The internal hysteresis ratio should be greater than 65 percent but less than 79 percent. The hysteresis ratio, determined from the
31、 force vs. deflection 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. SAE INTERNATIONAL J2878 JUN2016 Page 5 of 6 Figure 1 - Test set-up specifications 13.97 0.023 kg (30.80 0.05 lb)
32、 0.5 SAE INTERNATIONAL J2878 JUN2016 Page 6 of 6 Figure 2 - Hysteresis definition 4. NOTES 4.1 Revision Indicator A change bar (I) 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
33、 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
