1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14497 Seat Structure Fatigue Durability Back Structure Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 1 of 5 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of confl
2、ict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure evaluates the structural durability characteristics of the seat by simulating the load generated from traveling a road with a heavy person sitting on the seat. 1.2 Foreword. No
3、t applicable. 1.3 Applicability. This procedure applies to all GM passenger cars, light duty and medium duty trucks. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. SAE J826 2.2 GM Standards/Specifications. None
4、2.3 Additional References. None 3 Resources 3.1 Facilities. An approved GM certified test lab with an adequate bed plate or equivalent work surface necessary for mounting the test sample and associated test fixtures appropriate for the procedure to be run. 3.1.1 Calibration. The test facilities and
5、equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative test facilities and equipment may also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3
6、.2 Equipment. 3.2.1 Mounting Fixture. A means to support the seat system including rigid mounting blocks, or equivalent, simulating the floor attachment points to mount the seat system in body position on a bed plate. 3.2.2 Load Application Device. Actuators with a load capacity of 3000 N each and c
7、onnections to the seat and back pan so that seat and backrest can be loaded simultaneously. 3.2.3 Load Cell. A load cell with 3000 N capacity or equivalent for measuring applied load to seat and back. 3.2.4 Loading Device. A loading device simulating an occupant on the seat, similar to the H-point d
8、ummy seat pan (as described by the currently approved SAE J826 Three Dimensional (3D) form). The actuator is connected to the seat pan using a pivot bearing around the y axis lying in the H-point, its axis perpendicular to the bedplate. A second loading device for the backrest, using a backrest pan
9、(SAE J826) and a bracket to connect the pan to the actuator located behind the backrest (may also be located above the seat in front of the backrest). Here the pivot point is located at the connection of bracket and pan, as close to the pan as possible. The actuator axis is perpendicular to the back
10、rest at half of its travel during the test (see Figure 1). Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14497 Copyright 2013 General M
11、otors Company All Rights Reserved February 2013 Page 2 of 5 Figure 1: Test Setup The loading and unloading movements of both actuators always start approximately simultaneously. Their velocities have to be adjusted, so that they both reach full load at approximately the same time. Now the next movem
12、ent (unloading after loading and loading after unloading) starts simultaneously on both actuators after they have reached maximum load. Based on engineering judgment (i.e., for the testing of improvements) seat and backrest loading may be tested separately. Note: Calibrate all instrumentation as req
13、uired. 3.3 Test Vehicle/Test Piece. Complete Trimmed Seat Subsystem. An appropriate seat subsystem consisting of all components necessary to qualify as complete for the model and trim level specified by the Design Release Engineer (DRE). 3.4 Test Time. Not applicable. Calendar time: days Test hours:
14、 hours Coordination hours: hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. The following individuals are necessary to complete this test procedure. General Motors Design Release Engineer. General Motors Validation Engineer. Testing Organizations Test Engineer. Testing Orga
15、nizations Test Technician. 4 Procedure 4.1 Preparation. 4.1.1 Visual Inspection. The Design Release Engineer shall visually inspect the seat assembly for correct part numbers, quality of frame welds, proper fit and assembly and the presence of all required parts. 4.1.2 Mounting. Mount the seat subsy
16、stem on the appropriate model mounting blocks. Include mounting spacers if specified for installation. The slide angle on the adaptation has to be within 0.25 degrees difference to the specified angle. The seat anchorage points of the adaptation are to be within 0.2 mm deviance to the specified poin
17、ts. 4.1.3 Adjustment Setting. If so equipped, set all adjustments of the seat as follows: a. Fore-and-aft adjusters - rearmost, 5 mm short to end stop. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted with
18、out license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14497 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 3 of 5 b. Height adjuster - full up, 5 mm short to end stop. c. Recliners - design back angle. d. Head restraints - full up. Any additional adjustable fea
19、tures (lumbar, thigh, etc.,) should be set so as to place the seat system center of gravity to its highest location without putting close to but short of the end stops. 4.2 Conditions. 4.2.1 Environmental Conditions. Unless otherwise specified in the Subsystem Technical Specification (SSTS), conduct
20、 test in a room temperature environment. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Find the load application point using th
21、e test setup method in Figure A1. 4.3.2 Attach SAE J826 back pan to the load application device. Place the pivot point of the loading device onto the load application point obtained in 4.3.1. Loading direction shall be perpendicular to the design seat back torso line (see Figure A2). The load on the
22、 load application point shall result, unless otherwise specified, in 450 Nm around H-point. 4.3.3 Set the seat bottom form so that it is centered in the seating position. This form is to be placed such that it does not come into contact with the seat back in any way. Adjust the vertical actuator so
23、that it attaches to the seat bottom form and is vertical to the bedplate. Set the load control device to apply the load specified in the SSTS. The default value for the load amount is 2.2 kN. 4.3.4 Apply the load to the seat back and the seat until it reaches the number of cycles specified in the SS
24、TS. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. After the total number of cycles, the seat shall still be fully able to function. Inspect the seat at least every 25% (recommended 5%) of the total amount of cycles for any sign of cracks, weld failure, loss of integrity or
25、unusual noise. Also check the backrest recliner for movement (i.e., visible as rotation of the recliner wheel). 5.3 Test Documentation. With reference to this test procedure, the results shall be represented in a GM approved test report. It shall contain a complete identification of the structural s
26、ubsystem or the structural components (part number, lot number, etc.) Detailed pictures of the seat set up, and the adjustments necessary to obtain the test load shall be included. If any cracks, breakage or weld damaging in the structure is found, pictures shall be taken. Document every possible fa
27、ilure mode found in the seat structure. 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety
28、and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. 3D Three Dimensional DRE Design Release Engineer SSTS Subsystem Technical Specification Copyright General Motors Company Provid
29、ed by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14497 Copyright 2013 General Motors Company All Rights Reserved February 2013 Page 4 of 5 8 Coding System This standard shall be
30、 referenced in other documents, drawings, etc., as follows: Test to GMW14497 9 Release and Revisions This standard was originated in October 2005. It was first approved by the Global Seat Team in May 2006. It was first published in December 2006. Issue Publication Date Description (Organization) 1 D
31、EC 2006 Initial publication. 2 FEB 2013 5 Year Refresh (Interiors - Seats) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14497 Copyrigh
32、t 2013 General Motors Company All Rights Reserved February 2013 Page 5 of 5 Appendix A Figure A1: Method of Determining Load Application Point Figure A2: Load Application Method Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
