《GMW-8518-2005.pdf》由会员分享，可在线阅读，更多相关《GMW-8518-2005.pdf（16页珍藏版）》请在三一文库上搜索。
1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure Noise and Vibration GMW8518 Subjective Squeak and Rattle Evaluation: Vehicle Level Copyright 2005 General Motors Corporation All Rights Reserved July 2005 Originating Department: North American Engineering Standards Page 1 of 16 1 Scope Note: Nothing i
2、n the specification supersedes ap- plicable laws and regulations unless specific ex- emption has been obtained. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. To implement a worldwide uniform process for evaluating t
3、he Squeak and Rattle (S&R) performance of a complete vehicle. This includes the detection, the evaluation (by subjective rating of S&R complaints), as well as some root source analysis. Furthermore the documentation of S&R complaints and the results of the root source analysis are described for init
4、iation of problem resolution. This procedure consists of three parts: A Quasi-static Evaluation, a Dynamic Road Simulation Evaluation (where available) and a Dynamic On-road Evaluation. This procedure also provides detailed instructions for temperature evaluations using environmental road simulator.
5、 1.2 Forward. This procedure will guide an evaluator through full vehicle Squeak and Rattle Evaluations. The General Motors Uniform Test Standard (GMUTS) Subjective Rating Scale with the performance and disturbance critera is used to evaluate components and subsystem. 1.3 Applicability. For all pass
6、enger cars, light commercial vehicles and medium duty trucks. 1.4 Definitions. S&R Noise: Disturbing or annoying noises excited by dynamic or static inputs, as well as noises which occur while operating vehicle components. This means all noises which are avoidable and which customers do not expect.
7、Root Source: Often confused with Root Cause, Root Source pertains to identifying where the noise source is (i.e., the exact location on each of the two parts that came incontact to produce the S&R). Root source clues include witness marks, wear, fastener loosening, broken or mis-installed integral f
8、asteners and/or clips. Root Cause Analysis goes a step further, often requiring one to look at the Engineering Drawings, Tolerances, actual parts and perhaps the manufacturing and/or assembly process to determine why the noise is occurring. The reasons why may include that the parts are in not built
9、 to specification and that the design, manufacture and assembly processes are not capable of producing S&R free parts. Quasi-Static: Customer actuated component and subsystem movement, operation and/or adjustment when the vehicle itself is stationary. Typical Force: The normal or average force requi
10、red to operate an adjustment, accessory or feature of a component or sub-system. Mode of Operation: The directional movement of a component that is evaluated. For example: The power exterior mirror has (4) modes of operation: up, down, inboard and outboard. 2 References Note: Only the latest approve
11、d standards are ap- plicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMN7000 GMW7699 GMW7294 GMW7879 2.3 Additional References. GM R&D Report AS-598, “Hearing Acuity Standard for Squeak and Rattle Evaluators.” 3 Resources 3.1 Facilitie
12、s. An environmental chamber with the testing temperature range from -30 to + 50C may be required to meet additional VTS requirements. 3.2 Equipment. 3.2.1 Facilities for Quasi-Static Evaluations. Utilize an area with ambient sound pressure level less than 53 dBA to evaluate the vehicle for S&Rs. 3.2
13、.2 Facilities for Dynamic Road Simulation. Utilize a road simulator with appropriate road inputs. A quiet test cell with a road simulator consisting of a 4-post hydraulic shaker capable of GMW8518 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2005 General Motors Corporation All Rights Reserved Page 2
14、 of 16 July 2005 providing separate road inputs to each vehicle tire is required. Additionally, the environmental road simulators shall be capable of producing test cell temperatures from -30 to +50C. The environmental road simulators are also equipped with solar lamps, used to heat vehicle interior
15、 surfaces. 3.2.3 Facilities for Dynamic On-road Evaluations. Utilize the road systems associated with your facility and documented in Appendix B. A comparison of road inputs can be reviewed in Appendix A. 3.3 Test Vehicle/Test Piece. A “design intent” test vehicle, which reflects the development or
16、production status of the appropriate build phase, shall be used to subjectively evaluate squeak and rattle vehicle level performance. 3.4 Test Time. The following is an estimate of the time (work-hours) needed to perform various portions of this procedure. Consider prep, downtime and analysis of dat
17、a in determing the total calendar time required. It is noted that there are regional differences in the number of people and duration required and that the following tables are shown as guidelines only. Table 1: Without Environmental Duration Technician Resource 4 hrs Engineer Resource 8 hrs Total C
18、alendar Duration 1 day Evaluation Day 1 Quasi-static 2 hr Dynamic Road Simulation 4 hrs Dynamic On-road 2 hrs Table 2: With Environmental Duration Technician Resource 12 hrs Engineer Resource 24 hrs Total Calendar Duration 3 days Evaluation Day 1 Day 2 Day 3 Quasi-static 1 hr - - Dynamic Road Simula
19、tion 4 hrs 8 hrs 8 hrs Dynamic On-road 3 hrs - - 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. 3.6.1 Auditors. Evaluators can work by themselves or with the help of others. Generally, when driving on the road systems, a second occupant is recommended. 3.6.2 Auditor Skills. Eac
20、h evaluator shall be trained in squeak and rattle noise/sound identification and techniques. 3.6.3 Hearing Requirements. (NA Only) Vehicle auditors for squeak and rattle must have an Audiological test performed on both ears. Threshold shift at pure tone frequencies of 500 Hz, 1000 Hz, 2000 Hz, and 3
21、000 Hz must be measured. If the dB loss in each ear averaged over the four test frequencies is 25 dB, the subject meets the minimum hearing qualification for auditing S&Rs. If the shift in either ear is 25 dB, the subject does not meet the minimum requirements. This requirement is per GM R&D Report
22、AS-598, “Hearing Acuity Standard for Squeak and Rattle Evaluators.” 4 Procedure 4.1 Preparation. 4.1.1 All equipment which is required for using a vehicle on public roads (legal requirements and standard features) has to be in/on the vehicle. The equipment has to be placed and fixed at the provided
23、locations (first aid box, warning triangle, license plate, vehicle tools, spare wheel, towing hook,.) 4.1.2 Affix or remove any parts that are not installed correctly. 4.1.3 Remove loose items from glove box and other compartments. 4.1.4 Remove any non-production items from the vehicle (e.g., camofl
24、ague and plastic film over seats). 4.1.5 Remove stickers on the windows if they cause unwanted noise. If stickers cannot be re- moved, do not include the sound associated with the sticker(s) in the evaluation. 4.1.6 Ensure vehicle is clean and dry prior to evaluation. 4.1.7 The recommended fuel leve
25、l is between 1/4 and 3/4 full. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the re- quirements of the procedure shall have been agreed upon. Such requirements shall be specified -,-,- GM WORLDWIDE ENGINEERING STANDARDS GMW8518 Copyright 2005
26、General Motors Corporation All Rights Reserved July 2005 Page 3 of 16 on component drawings, test certificates, reports, etc. 4.2.2.1 Road Simulator Evaluation. When evaluating using hot and cold temperature in an environmental chamber, the evaluations should be performed according to the provided t
27、emperature profile (Appendix D). If in the event a Road Simulator is not available, appropriate regional Proving Grounds roads can be used. 4.2.2.2 Proving Ground Road System Evaluation. Roads used for the dynamic evaluation should be dry (no standing water) and wind speed should be 30C) or cold (i.
28、e., -5C) for more than 10 minutes at a time. After 10 minutes of evaluation at temperature extremes, test personnel shall remain outside the chamber for a minimum of 15 minutes. 6.1.3 At temperature extremes, the test personnel may want to relay (via headset) any ratings or comments for the observer
29、 to record. 6.1.4 Solar Do not look directly at lamps. Cover bare skin. Wear UV blocking sunglasses. 6.2 This procedure may involve hazardous materi- als, operations, and equipment. This method does not propose to address all the safety problems as- sociated with its use. It is the responsibility of
30、 the user of the method to establish appropriate safety and health practices and determine the applicabil- ity of regulatory limitations prior to use. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as fol- lows: Test to GMW8518 8 Release
31、and Revisions 8.1 Release. This test procedure originated in De- cember 2001, replacing GMUTS R-15-8518, MTL8518. It was first approved in November 2001. It was first published in April 2002. 8.2 Revisions. Rev Approval Date Description (Organization) A MAY 2005 Revised Table A1 and Sec- tion B2 to
32、add test roads for GMNA (Global N&V Squeak & Rattle IDSR Harmonization Team) GM WORLDWIDE ENGINEERING STANDARDS GMW8518 Copyright 2005 General Motors Corporation All Rights Reserved July 2005 Page 7 of 16 Appendix A Table A1: General Types of Road Inputs Type of Excitation Brazil GMNA Holden Isuzu O
33、pel Saab 1 Torsion, quasi-static Twist Ditches (Simulator) Twist Course Twist Ditch Course N.A. Ramps (13, 16) Ramps 2 Torsion, dynamic Double Inclina- tion Ramp Sine Inputs Twist Ditches Bump Track Sine Input Twist Course, Twist Ditch Course Wavy Road Twist Track Twist Track 3 “Public roads”, smoot
34、h roads w cor- nering Straightway,City Traffic,Circular Tracks Smooth sec- tions of track access roads Hyne Road Circle Track Ride and Han- dling Road, Circular Track, Access Roads Oval Truck Ride Track, Right Lane Circular Track 4 Low excitation, ran- dom D2 & D1 - As- phalt Not Available Ride and
35、Han- dling Road, Skid Pad Rough Asphalt Section, Ac- cess Roads Rough As- phalt Road in the Factory Rough Asphalt Rough Asphalt 5 Middle excitation, random D1 Track 12-Mile Road Pontiac Trail 7.2% Track Return Belgian Blocks Noise Gener- ated Road Cobble Stones, “Rheinstrae” Cobble Stones, “Paving S
36、tones” 6 High excitation, ran- dom D2 Track Spalled Con- crete, Noise Road, Belgian Blocks Rough Track 2nd Belgian Blocks Belgian Blocks, “Groblockwel- lenbahn” Belgian Blocks 7 Middle excitation, periodic, in phase Sine Sweep (Simulator) Rumble Strips In Phase Rum- ble Strips Wavy Road in phase Sin
37、uswaves in phase 8 Middle excitation, periodic, in-phase or out-of-phase Sine Sweep (Simulator) Rumble Strips North Chatters South Chatters Out of Phase Rumble Strips Wavy Road out of phase Sinuswaves out of phase 9 High Excitation Peri- odic Truck Loop Vehicle Dy- namics Chatter Bumps Washboard Rop
38、e Road Bump Track- Rough Track 10 Cycle full steering angle City Traffic Track Normal Driv- ing Surfaces Skid Pad City Cycle Skid Pad Skid pad Normal Driving Surfaces 11 Impact Bumps D2 - Bumps Oval Track Potholes Rail Crossings Jumping Board, Pot- hole 12 Acceleration Straightway Track Normal Driv-
39、 ing Surfaces Oval Truck Skid pad Normal Driving Surfaces 13 Braking Straightway Track Normal Driv- ing Surfaces Oval Truck Skid pad Normal Driving Surfaces -,-,- GMW8518 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2005 General Motors Corporation All Rights Reserved Page 8 of 16 July 2005 Appendix
40、B: Squeak & Rattle Dynamic Testing Roads Vehicle Level B1 Brazil-Dynamic Schedule During the dynamic test, vehicle shall be driven several times on the tracks until all S&R noises are detected and noted down in the Evaluation Sheet. Tracks, driving speeds and driving conditions shall be selected as
41、follows. Each subsystem and or component shall be position to all of its operating conditions and or cycled during the road evaluation. B1.1 Straightway Track, Circular Track and D1 track right lane. As initial evaluation, drive in these tracks in different speeds, simulating the various usage condi
42、tions. Note down the possible noises and condition they are noticed (road speed and area). A second evaluator shall occupy all possible seating positions. B1.2 D2 Durability track. Range speeds from 25 to 50 km/h in the region from the track entrance up to the ”washboard”. Observe the same speeds wh
43、en driving on the “By-pass”. In the remaining track follow the road speed indications. A second evaluator shall occupy all possible seating positions. For the different noises, attempt to drive at the most critical speed. Identify and write down the noise origin, as well as the conditions that are n
44、oticed. B1.3 Torsion Test. The body torsion stability shall be tested using double inclination ramp with windows and sunroof open and closed. Vehicle shall enter and leave the double inclination ramp driving forward and backward in low speed, as detailed below (similar as the Durability and Corrosio
45、n Test). B1.4 Ramp Acceleration. In the 20% gradient ramp, vehicle shall climb the ramp up, forward and backward in different accelerations. Braking shall occur in moderate speeds and various intensities. Repeat such maneuvers thrice. Should noise be noticed, repeat the maneuvers as many times as re
46、quired to identify the cause. If possible, repeat the procedure in different gradient ramps. B1.5 Steering Test: “City Traffic” Track. Curves shall be made in different speeds and steering angles to stop as to checking noises. Should noise occur, repeat several times a speed x steering angle combina
47、tion. Repeat it as many times as required to identification of the noise root source. B1.6 Acceleration and Deceleration Test. Under this acceleration and braking test on a Straightway Track, repeat the same maneuvers detailed in paragraph B6.4. B1.7 Simulating the Engine RPM Effect: Straightway Tra
48、ck. Stationary on the ramp, ready to engage clutch, gradually accelerate engine and check as to possible noises at every rpm increase. For automatic transmission, hold the service brake applied while accelerating. Should noise occur, hold the engine speed and check as to noise cause. Note the noises
49、 down in the Evaluation Sheet. B2 GMNA-Dynamic Schedule B2.1 Dynamic Road Schedule. Accessories such as the sunroof, sunroof shade, ashtray, sunvisor etc. should be evaluated in opened and closed positions to simulate customer conditions. While performing this evaluation, the radio and the HVAC shall be on low fan speed and the windows up unless specifically evaluating these areas for noises. A CD should be inserted into the CD player, if vehicle is so equi