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GMW GMW14497_Seat Structure Fatigue Durability.pdf

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GMW GMW14497_SEAT STRUCTURE FATIGUE DURABILITY
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Template For ENG STDS WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14497 Seat Structure Fatigue Durability ? Copyright 2016 General Motors Company All Rights Reserved October 2016 Page 1 of 5 1 Introduction Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflict 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 Applicability. This procedure applies to all GM passenger cars, light duty and medium duty trucks. 1.3 Remarks. The intent of the test is to assess the fatigue durability of the seat structure. Damage to individual components other than the main structure (i.e., cushion suspension, lumbar, cushion length adjuster, etc.) should not be considered in the overall structure fatigue assessment. 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 2.3 Additional References. ? Subsystem Technical Specification (SSTS). 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 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. 3.2 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 connections 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 dummy 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 (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 backrest at half of its travel during the test (see Figure 1). Copyright General Motors Company Provided by IHS under license with General Motors CompanyLicensee=NextEV USA, INC/5993526001, User=romano, paola Not for Resale, 04/06/2017 11:07:32 MDT Reproduction, distribution or publication of these standards is expressly prohib --``,,`,``,`,`,`,,,,````,,``,,`-`-`,,`,,`,`,,`---GM WORLDWIDE ENGINEERING STANDARDS Template For ENG STDS GMW14497 ? Copyright 2016 General Motors Company All Rights Reserved October 2016 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 movement (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 required. 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. Calendar time: 10 days Test hours: 204 h Coordination hours: 8 h 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 Organization’s Test Engineer. ? Testing Organization’s 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 subsystem 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 points. 4.1.3 Adjustment Setting. If so equipped, set all adjustments of the seat as follows: Copyright General Motors Company Provided by IHS under license with General Motors CompanyLicensee=NextEV USA, INC/5993526001, User=romano, paola Not for Resale, 04/06/2017 11:07:32 MDT Reproduction, distribution or publication of these standards is expressly prohib --``,,`,``,`,`,`,,,,````,,``,,`-`-`,,`,,`,`,,`---GM WORLDWIDE ENGINEERING STANDARDS Template For ENG STDS GMW14497 ? Copyright 2016 General Motors Company All Rights Reserved October 2016 Page 3 of 5 a. Fore-and-aft adjusters - rearmost, 5 mm short to end stop. b. Height adjuster - full up, 5 mm short to end stop. c. Recliners - design back angle. d. Head restraints - full up. Any additional adjustable features (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 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 the test setup method in Appendix A, 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 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 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 SSTS. Set the load frequency to ensure the required load is achieved. Typically, this is between 1 Hz and 3 Hz. 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 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 subsystem 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 failure mode found in the seat structure. 6 Safety This Engineering Standard may involve safety requirements for hazardous materials, the method of operations and equipment. This standard does not propose to address all the safety issues associated with its use. It is the responsibility of the user of this standard to ensure compliance with all appropriate safety and health practices. This would include any specific training that may be required. The safety and health standards include site specific rules and procedures, company rules and procedures, and Government Standards. Contact shall be made with the appropriate site Safety and Health personnel for further direction and guidance in these matters. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. 3D Three Dimensional DRE Design Release Engineer Copyright General Motors Company Provided by IHS under license with General Motors CompanyLicensee=NextEV USA, INC/5993526001, User=romano, paola Not for Resale, 04/06/2017 11:07:32 MDT Reproduction, distribution or publication of these standards is expressly prohib --``,,`,``,`,`,`,,,,````,,``,,`-`-`,,`,,`,`,,`---GM WORLDWIDE ENGINEERING STANDARDS Template For ENG STDS GMW14497 ? Copyright 2016 General Motors Company All Rights Reserved October 2016 Page 4 of 5 F Force SSTS Subsystem Technical Specification 8 Coding System This standard shall be 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 DEC 2006 Initial publication. 2 FEB 2013 5 Year Refresh (Interiors - Seats) 3 OCT 2016 Continuous improvement. (Interior – Seats) Copyright General Motors Company Provided by IHS under license with General Motors CompanyLicensee=NextEV USA, INC/5993526001, User=romano, paola Not for Resale, 04/06/2017 11:07:32 MDT Reproduction, distribution or publication of these standards is expressly prohib --``,,`,``,`,`,`,,,,````,,``,,`-`-`,,`,,`,`,,`---GM WORLDWIDE ENGINEERING STANDARDS Template For ENG STDS GMW14497 ? Copyright 2016 General Motors Company All Rights Reserved October 2016 Page 5 of 5 Appendix A Figure A1: Method of Determining Load Application Point F Force Figure A2: Load Application Method Copyright General Motors Company Provided by IHS under license with General Motors CompanyLicensee=NextEV USA, INC/5993526001, User=romano, paola Not for Resale, 04/06/2017 11:07:32 MDT Reproduction, distribution or publication of these standards is expressly prohib --``,,`,``,`,`,`,,,,````,,``,,`-`-`,,`,,`,`,,`---
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