1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14566 Exhaust System Road Load Measurements Copyright 2011 General Motors Company All Rights Reserved July 2011 Originating Department: GME Specification Center Page 1 of 4 1 Scope Note: Nothing in this standard supercedes applicable laws and regula
2、tions. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This procedure describes the stress measurements on the exhaust system. The measured values recorded serve: x Component dimensioning. x Generating the test signal
3、 on the test benches. x Determining quality requirements of the individual components. 1.2 Foreword. The stress measurements on the exhaust system and its components are undertaken while driving at the GM proving ground. 1.3 Applicability. For all exhaust systems. 2 References Note: Only the latest
4、approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW14381 GMW14390 3 Resources 3.1 Facilities. The test facility road systems must be the same as those used to validate the vehicle level durability. 3.2 Equipme
5、nt. According to the relevant test procedures. 3.2.1 Calibration. The test equipment shall be in good working order and shall have a valid calibration label. 3.3 Test Vehicle/Test Piece. According to the relevant test procedures. 3.4 Test Time. Calendar time: 5 weeks Test hours: 40 hours Test Engine
6、er hours 120 hours Test Technician hours 120 hours Coordination hours 2 hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking per
7、mitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14566 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 2 of 4 4 Procedure 4.1 Preparation. 4.1.1 The vehicle measurements shall be performed on the same road systems and schedules used to validate vehic
8、le level durability. Furthermore, additional special maneuvers may be stipulated. This takes place within the framework of the multi axial thermodynamic exhaust systems test. 4.1.2 The vehicle measurement shall be performed with the engine running, warm operation, with exhaust gases diverted to enab
9、le the use of cold gauges. Cold gauges are required for all measurements with the exception of thermocouples. 4.1.3 Exhaust skin temperatures shall be measured without exhaust gas diverted from the exhaust system. Measurements will be performed on the same road systems and schedules used to measure
10、exhaust accelerations, strains, etc. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 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. 4.2.
11、2.1 Samples of components or material released to this specification shall be tested for conformity with the requirements of this specification and approved by the responsible GM Department prior to the start of delivery of production level components or materials. 4.2.2.2 Any change to the componen
12、t or material, e.g., design, function, properties, manufacturing process and/or location of manufacture requires a new release of the product. It is the sole responsibility of the supplier to provide the customer, unsolicited, with documentation of any change or modification to the product/process,
13、and to apply for a new release. 4.2.2.3 If not otherwise agreed to the entire verification test shall be repeated and documented by the supplier prior to start of delivery of the modified or changed product. In some cases a shorter test can be agreed to between the responsible GM Department and the
14、supplier. 4.3 Instructions. The component measuring points shall be selected in accordance with the measuring points listed in Appendix A, Table A1, in so far as type and direction are concerned. 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. With reference to this standard
15、the results shall be compiled in a test report. 5.3 Test Documentation. All the measuring points shall be documented and described by photographs in the measurements report. 5.3.1 The reduction of the signal-time pattern takes place in the form of a Rain flow Matrix. Damaging inputs from the Belgium
16、 Blocks and the maximum pot hole are required to be maintained within the data reduction. Based on this, a damage calculation is performed using Relative Miner. The stress is illustrated in the form of a Level Crossing Diagram. The GM DE/DRE must approve the final data reduction prior to conducting
17、hardware rig testing. 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 and health practic
18、es and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. C T S Component Technical Specification DE Designing Engineer Copyright General Motors Company Provided by IHS under license with General Motors
19、CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14566 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 3 of 4 DRE Design Release Engineer SSTS Subsystem Technical Specification VTS Vehicle Technic
20、al Specification 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14566 9 Release and Revisions This standard was originated in October 2005. It was first approved by Global Exhaust Center in February 2006. It was first published in Februar
21、y 2006. Issue Publication Date Description (Organization) 1 FEB 2006 Initial publication. 2 JUL 2011 5 year refresh; transferred into new template; paragraph 2 clean up of references (Global Exhaust Center) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot
22、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14566 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 4 of 4 Appendix A Table A1: Component Measuring Point for Vehicle Measurements Component Measuring Poin
23、t Sensor Type Position Direction Measuring Output Engine Cylinder head Acceleration (Note 1) Center of cylinder head cover Z, Y, X Acceleration Travel between cylinder head and upper body front X Travel Flex pipe Flex pipe Wheatstone Strain Gage or Travel between inlet and outlet Z, Y, X Travel Outl
24、et Path between flex pipe outlet and vehicle underbody X, Y, Z Travel Catalytic converter underbody Pipe connection Wheatstone Strain Gage at pipe weld joint Z, Y Bending moment (Note 2) Support connection Wheatstone Strain Gage at the bracket weld joint Z, Y, X Force (Note 3) Acceleration (Note 1)
25、at the start of the bracket Z, Y, X Acceleration Center muffler Pipe connection Wheatstone Strain Gage at pipe weld joint Z, Y Bending moment (Note 2) Support connection Wheatstone Strain Gage at the bracket weld joint Z, Y, X Force (Note 3) Acceleration (Note 1) at the start of the bracket Z, Y, X
26、Acceleration Rear muffler Pipe connection Wheatstone Strain Gage at pipe weld joint Z, Y Bending moment (Note 2) Support connection Wheatstone Strain Gage at the bracket weld joint Z, Y, X Force (Note 3) Acceleration (Note 1) at the start of the bracket Z, Y, X Acceleration Vehicle underbody Support
27、 connection Acceleration (Note 1) on bracket flange Z Acceleration Connection for front axle support Acceleration (Note 1) on right screw head Z Acceleration Note 1: Measuring point for the system test on the thermodynamic exhaust system test bench. Note 2: Calibration taking account of GMW14390. Note 3: Calibration taking account of GMW14381. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
