1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW14406 Determination of Deformation of Molded Roof Lining Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 1 of 3 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of conflic
2、t between the English and domestic language, the English language shall take precedence. 1.1 Purpose. The purpose of this test is to determine the deformation of the molded roof lining resulting from the vacuum which arises at maximum vehicle speed. 1.2 Foreword. When driving a passenger car, partic
3、ularly when drop windows and/or the sunroof are open, a vacuum builds up in the passenger compartment which causes the molded roof lining to be drawn away from the roof panel. The extent to which the molded roof lining sags varies depending upon its stiffness. 1.3 Applicability. This test applies to
4、 molded linings for roofs both with and without a Sunroof (SR). 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. None 2.3 Additional References. None 3 Resources 3.1 Facilitie
5、s. Since the deformation of the molded roof lining is determined during a test drive at a constant maximum speed, the test shall be performed on the circular track of a GM testing ground. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calib
6、ration 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 Measuring probe, length 60 mm minimum with zero m
7、ark. 3.2.2 Steel ruler or caliper gage. 3.2.3 Foam block, approximately 5 mm 5 mm 2 mm (L W H), which can be pushed onto the measuring probe. 3.3 Test Vehicle/Test Piece. 3.3.1 Test Vehicle. The vehicle selected for testing shall be the model with the fastest final speed (most powerful engine) of it
8、s series. Note: If the model series includes notchback, hatchback and station wagon types, the fastest version of each type shall be selected. 3.3.2 Molded Roof Lining. 3.3.2.1 If a roof damper shall be installed, it shall comply with the release or planned release. The same applies to damper fasten
9、ing elements. 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 GMW14406 Copyright 2013 General Motors Company All Rights Reserved July 2013 P
10、age 2 of 3 3.3.2.2 The molded roof lining and its fitting shall comply with the release or planned release. 3.3.2.3. Pillar trim, beading, roof frame covers and parts which are installed in the molded roof lining shall be fitted in accordance with the release. 3.3.2.4 If parts are unavailable (e.g.,
11、 in the case of prototypes), then these shall be simulated by means of adhesive tape. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. The Measuring Points (MP) shall be marked on the molded roof lining a
12、s shown in Figure 1. Figure 1: Illustration of Measuring Points 4.2 Conditions. The test shall be performed by means of a test drive at maximum speed. Note: The drop windows, tailgate and sunroof (if applicable) shall be positioned as shown in Table 1. Table 1: Position of Windows etc., For Vehicles
13、 With or Without a Sunroof (SR) Positions Without SR With SR Drop Window, Front Wide Open Closed Drop Window Wide Open Closed Tailgate Closed Closed Heating/Ventilation Closed Closed Speed vmaximum vmaximum Sunroof - Ventilating Position 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Con
14、ditions. 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 Reference Measurement. A reference measurement shall be taken with the vehicle at a standstill.
15、 For this purpose, the center of the foam block shall be stuck onto the measuring probe. The probe shall then be held perpendicular to the molded roof lining and pushed through it until it touches the roof panel or roof 200 200 200 200 200 200M P 1 M P 2 M P 3 M P 4 M P 5 M P 6Copyright General Moto
16、rs Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14406 Copyright 2013 General Motors Company All Rights Reserved July 2013 Page 3 of 3 damper. The foam block ma
17、rks the distance from the tip of the probe, which shall then be measured using the caliper gauge. 4.3.2 Measurement at Maximum Speed. The vehicle shall be accelerated to vmax on the test track. The deformations of the molded roof lining occurring at vmaximum under the test conditions specified in Ta
18、ble 1 shall be measured using the probe at the measuring points already marked, exactly as described for the reference measurement. 4.3.3 Recording the Measured Values. The measured values determined during the reference measurement and the test drive shall be recorded in Table 2. Table 2: Recording
19、 of Measurement Values MP 1 MP 2 MP 3 MP 4 MP 5 MP 6 Reference Measurement Measurement at vmaximum Absolute Deformation Note: MP = Measuring Point 5 Data 5.1 Calculations. Not applicable. 5.2 Interpretation of Results. The absolute deformation values at each measuring point, to be entered in Table 2
20、, constitute the difference between the values measured at vmax and the reference measurement. 5.3 Test Documentation. With reference to this test method the results determined in 5.2 shall be presented in a test report. 6 Safety This standard may involve hazardous materials, operations, and equipme
21、nt. 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 use. 7 Notes 7.1 Glossary. Not
22、applicable. 7.2 Acronyms, Abbreviations, and Symbols. MP Measuring Point SR Sunroof 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW14406 9 Release and Revisions This standard was originated in September 2005. It was first approved by the
23、Global Roof Trim Subsystem Leadership Team in March 2006. It was first published in May 2006. Issue Publication Date Description (Organization) 1 MAY 2006 Initial publication. 2 JUL 2013 5 Year Refresh. (Interior Overhead Systems) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
