1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14374 Seat Heater Trench Vertical Load Durability Test Copyright 2012 General Motors Company All Rights Reserved July 2012 Originating Department: North American Engineering Standards Page 1 of 3 1 Scope Note: Nothing in this standard supercedes app
2、licable 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 performance of the heater pads in seats under a cyclical localized loading. It is intended to evaluate th
3、e performance of the heater pad in the seat, not the seat structure. 1.2 Foreword. Not applicable. 1.3 Applicability. This test shall be applied to all General Motors vehicles. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Spe
4、cifications. SAE J826 2.2 GM Standards/Specifications. None 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 of the test sample and associated test fixtures. 3.2 Equipment. 3.2.
5、1 Mounting Blocks. Rigid mounting blocks to simulate the floor attachment points to mount the seat system in body position on a bed plate or equivalent work surface. 3.2.2 SAE J826 Three Dimensional (3D) Butt Form. 3.2.3 Load Application Device. A pneumatic or hydraulic cylinder capable of applying
6、a maximum load, as specified in the Global Seat System Technical Specifications, and capable of attaching to the load cell connected to the butt form. 3.2.4 Heater Pad Monitoring Device. 3.3 Test Vehicle/Test Piece. An appropriate seat subsystem consisting of all components necessary to qualify as a
7、 completely trimmed seat for the model and trim level specified by the Design Release Engineer (DRE). 3.4 Test Time. Calendar time: 9 days approximately Test hours: 7 hours approximately Coordination hours: 0 hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. The following in
8、dividuals are necessary to complete this test procedure: GM DRE, GM Validation Engineer, Testing Organizations Test Engineer, and Testing Organizations Test Technician. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networki
9、ng permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14374 Copyright 2012 General Motors Company All Rights Reserved July 2012 Page 2 of 3 4 Procedure 4.1 Preparation. 4.1.1 Obtain Necessary Details. Obtain the following test details from the DRE/Design Engineer (DE) and G
10、M Validation Engineer: Loading locations. Center load over trench. The loading location is over seat cushion, wires or bus bar, passing through trench. If all wires or bus bars cannot be covered, then bias the butt form over outboard side trench. Repeat location procedure above for the seat back tre
11、nch. The test equipment - butt form - shall be moved forward from the bite line of the cushion until it sits on top of the seat trench that has the heater mat wire running through it. See Figure 1. 4.1.2 Mounting Seat Cushion. Mount the seat subsystem to the appropriate model mounting blocks. Includ
12、e mounting spacers if specified for installation. 4.1.3 Mounting Seat Back. By using the recliner or other attachment, suspend seat back 50 mm minimum horizontal above mounting block, allowing the back to flex. 4.1.4 Setup. There are multiple setups for this procedure and, therefore, other preparati
13、on information is integrated into the instruction 4.3. Figure 1: Test Setup 4.2 Conditions. 4.2.1 Environmental Conditions. 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
14、 specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Install the seat cushion in the design position. Let the system soak a minimum of 4 h at temperature. 4.3.2 Attach the heater monitoring device to the system and monitor current and change of resistance. Attac
15、h the heater monitoring devise directly to the heater wire, bypassing the module, is acceptable. 4.3.3 Attach the butt form to the load cell. Set the vertical load to 980 N (220 lb). 4.3.4 Apply the vertical load at the prescribed location on the seat cushion with the movement limited to 120 mm and
16、at the rate of 24 cycles per minute maximum. The butt portion of the butt form shall be placed over the trench on top of the wire or bus bar in the trench with a minimum of 75 mm coverage fore and aft of trench. The cyclic requirements are called out in the requirements section of the Global Subsyst
17、em Technical Specification (GSSTS). 4.3.5 During cycling monitor per this requirement. Eight (8) minutes at simulated vehicle operation control on highest setting power off for 22 minutes and repeat. Monitor heater element current at these intervals. 4.3.6 Repeat 4.3.1 through 4.3.5 for the remainin
18、g test locations per (4.1.1). 4.3.7 Evaluate the heater system to ensure no degradation has occurred after test. Use a microscope to evaluate, wire or composite, fatigue has not occurred and document results in the test report. Copyright General Motors Company Provided by IHS under license with Gene
19、ral Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14374 Copyright 2012 General Motors Company All Rights Reserved July 2012 Page 3 of 3 4.3.8 Check resistance characteristics performance of the heated seat. Perf
20、ormance shall fall within the design parameters and document results in the test report. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. Not applicable. 5.3 Test Documentation. Complete a GM approved test report form, include the following: 5.3.1 Complete identification of th
21、e structural subsystem or the structural components (part number, lot number, etc.) 5.3.2 Conditioning of test sample, if any. 5.3.3 Test conditions (temperature, humidity, force applied, etc.) 5.3.4 Test results. 5.3.5 Observations and conclusions. 6 Safety This standard may involve hazardous mater
22、ials, 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 and health practices and determine the applicability of regulatory limitations prior to us
23、e. 7 Notes 7.1 Glossary. Design Release Engineer: DE Design Engineer person responsible for the release of the design for production. 7.2 Acronyms, Abbreviations, and Symbols. 3D Three Dimensional DE Design Engineer DRE Design Release Engineer GSSTS Global Subsystem Technical Specification 8 Coding
24、System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14374 9 Release and Revisions This standard was originated in September 2005. It was first approved by the Global Seat Team in November 2005. It was first published in January 2006. Issue Publication Date Description (Organization) 1 JAN 2006 Initial publication. 2 JUL 2012 5 year refresh. (Interiors) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
