1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14834 Speaker Validation and Reliability Test Specification Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 1 of 27 1 Introduction Note: Nothing in this standard supercedes applicable laws and regulations. Note: I
2、n the event of conflict between the English and domestic language, the English language shall take precedence. This document is the GM World Standard for loudspeaker component Analysis (A), Development/Evaluation (D), Design Validation (DV), and Product Validation (PV) procedures as well as environm
3、ental and reliability demonstration tests for automotive and light duty truck applications. The Component Technical Specification (CTS) and Subsystem Technical Specification (SSTS) shall take precedence over this document. In the event of a conflict between the text of this specification and the doc
4、uments cited herein, the text of this standard takes precedence. 1.1 Scope. This document establishes a centralized set of electrical and mechanical validation methods and tests for GM Loudspeaker Components and Subsystems. Performance requirements shall be established in accordance to the Validatio
5、n Test Plan, SSTS, and CTS for each appropriate level. The Analysis procedures are used to aid in designing reliability into the product. The Development/Evaluation tasks are to be performed on first samples to provide a quick assessment of the products capability. Note: High risk design validation
6、tests shall also be run during the development/evaluation phase. The DV section of this standard describes environmental, durability and capability tests for loudspeakers for passenger vehicles and light duty trucks. The reliability section of this standard describes analytical and test methods that
7、 would demonstrate reliable operation of the electrical/electronic (E/E) equipment during their expected life in the vehicle. The design validation tasks and reliability tests are to be executed on prototype parts. Typical test sequences are in Appendix A, Figure A1. PV testing has been reduced with
8、 the requirement of part compliance to DV testing and no significant changes to the part design. Those changes deemed significant by the GM Engineering will require complete DV and PV testing. The product validation tasks are to be run on pilot or production parts. The supplier is required to suppor
9、t and participate in subsystem or vehicle level Analysis/Development/Validation (A/D/V) tasks as specified in the Statement of Requirements (SOR), CTS, or by GM Engineering. 1.2 Mission/Theme. Provides established common validation tests or methods for GM that will be delegated to be performed eithe
10、r on the vehicle, buck, subsystem, component, and/or bench. 1.3 Classification. This standard applies to all loudspeakers and any of their external components used in cars and light-duty trucks. 1.4 Reliability. 1.4.1 Reliability Demonstration. The CTS reliability requirement can be demonstrated by
11、using the analysis and/or design validation procedures. Vibration: The analysis process shall simulate the vibration procedure in the design validation section to demonstrate the vibration reliability. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for
12、ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14834 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 2 of 27 Thermal Fatigue: The analysis procedure shall simulate the thermal shock and power temperature p
13、rocedures in the design validation section to demonstrate the reliability requirements. If the reliability is demonstrated by analytical methods, then the Power Temperature Cycle Test cycles can be reduced to the minimum number of cycles (200) defined in GMW3172 section titled, Power Temperature Cyc
14、le Test, providing that the product is exercised for the required number of usage cycles. 1.4.2 Reliability Demonstration by use of Highly Accelerated Life Test (HALT) Methods. The HALT methods described in this document are not intended for a quantitative reliability demonstration. The HALT procedu
15、res shall be used for two purposes: 1. To determine the design limits in order to assess the ruggedness of the product. 2. To develop a limited HALT procedure for usage during the product validation phase. 2 References Note: Only the latest approved standards are applicable unless otherwise specifie
16、d. 2.1 External Standards/Specifications. EN 60529 IEC 651-5 IEC 61164 ISO/TS 16949 IEC 225 IEC 60268-5 ISO/IEC 17025 SAE J2412 IEC 529 IEC 61014 2.2 GM Standards/Specifications. 9981285 GMW3172 GMW14011 GMW14872 9985821 GMW3191 GMW14833 GMW16449 GMW3059 2.3 Additional References. Arrhenius Equation
17、 Method Component Technical Specification Statement of Work Subsystem Technical Specification 3 Test Preparation and Evaluation 3.1 Resources. 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
18、 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. 3.1.3 Facilities. The test facilities shall be ISO/TS 16949 and/or ISO/IEC 17025 certified. 3.1.4 Equipment. 3.1.4.
19、1 Electrodynamics vibration generator within a frequency range of 10 Hz to 2000 Hz. 3.1.4.2 Direct Current (DC) sources 5 V. 3.1.4.3 Sine wave noise generator. 3.1.4.4 Test signals: Sine wave signals to IEC 60268-5 Broadband/narrow-band noise according to IEC 60268-5 3.1.4.5 Low frequency (LF) ampli
20、fier according to IEC 60268-5. 3.1.4.6 Microphone amplifier and measuring microphone according to IEC 60268-5. 3.1.4.7 Third-octave filter according to IEC 225. 3.1.4.8 Ohmic resistor suited to the nominal impedance of the loudspeaker with an accuracy of 1% and a loading capacity of 20 W. Copyright
21、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 GMW14834 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 3 of 27 3.1.4.9
22、Sound baffle to IEC 60268-5. 3.1.4.10 Voltmeter according to IEC 651-5. 3.1.4.11 Frequency analyzer. 3.1.4.12 Acoustic measuring environment according to IEC 60268-5. 3.1.5 Test Vehicle/Test Piece. The sources of samples are summarized here. See 1.1 for details. 3.1.5.1 The Development/Evaluation ta
23、sks shall be performed on the first samples. Note: Perform high-risk design validation on development samples. 3.1.5.2 Perform design validation and reliability tests on prototype parts. 3.1.5.3 Perform validation on pilot or production parts. 3.1.6 Test Time. Not applicable. 3.1.7 Test Required Inf
24、ormation. Not applicable. 3.1.8 Personnel/Skills. Not applicable. 3.2 Preparation. The test samples shall be production intent design and materials for design validation and manufactured on production tooling, with production materials and processes for product validation. 3.3 Conditions. 3.3.1 Envi
25、ronmental Conditions. Not applicable. 3.3.2 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. Unless stated otherwise, Table 1 shall define the test environment
26、parameters and tolerances to be used for all validation testing: Table 1: Parametric Tolerances Parametric Tolerance High Temperature +85 C 3 C Room Ambient Temperature +23 C 5 C Low Temperature -40 C 3 C Test Time Specification +2%, -0% Room Ambient Relative Humidity (RH) 50% 20% Chamber Humidity S
27、pecification 5% Voltage Specification 0.1 V (as measured at the module) Vibration Specification 0.2G or Specification 20% (whichever is greater) Mechanical Shock Specification 20% Frequency Specification 1% 3.4 Instructions. 3.4.1 Preconditioning. All speakers are to be conditioned prior to testing
28、per IEC 60268-5, Preconditioning. Alternative preconditioning may be allowed if approved by GM Validation. 3.4.2 Operating/Non-Operating Tests. Unless otherwise specified the device(s) under test (DUT) will be in either an operating or non-operating state during testing. 3.4.2.1 Operating Test. Part
29、s that are powered during testing will have a signal of pink noise at one-third () of maximum root mean square (RMS) power rating of speaker, at defined speaker nominal impedance, cycled 1 minute on and 1 minute off for the entire test cycle. Copyright General Motors Company Provided by IHS under li
30、cense with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14834 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 4 of 27 Unless otherwise specified, if a crossover external to
31、the loudspeaker driver exists, testing shall be done with the external crossover in place. 3.4.2.2 Unpowered Test. Parts that are unpowered shall not see any input signal other than those required to perform functional/parametric checks (per 3.4.4.1). 3.4.3 Functional, Parametric, Continuous Monitor
32、ing Tests and Functional Check. The Functional/Parametric Tests are procedures, which verify the functional and parametric requirements. The Continuous Monitoring Tests verify that the functional requirements are met while the DUTs are being exposed to the test environment. All DUTs shall meet funct
33、ional performance (electrical and mechanical) and appearance parameter(s) at initial, during, and endpoint of each test. Each DUT shall minimally have initial and final endpoints taken unless otherwise approved by the platform/program engineering. In the case of long term life reliability testing, m
34、idpoint testing may be required as a minimum. Monitoring of units during a reliability test is mandatory when the test is designed as a reliability improvement/demonstration test, so that the test time to failure is recorded for data analysis and reliability calculations. If the reliability/life tes
35、t is designed as a fixed duration or a sequential test, then information on time to failure is desired, but may not be crucial, so that frequent interim performance tests may be sufficient during the tests or between individual tests in the test sequence. A reliability test schedule shall be utilize
36、d to define initial, midpoint(s), and endpoint conditions, requirements, and timing. The test criteria list for these parts is defined in 3.4.4. The test criteria data from the functional test shall define nominal and endpoint values (if necessary) that meet the specification, for each function and
37、each probe/monitor point. The supplier shall provide a spreadsheet of all test criteria data for each performance test to GM Engineering. Failure to meet any of the functional tests shall be considered a failure for the speaker assembly. All abnormalities shall be reported within 24 h with a formali
38、zed report to the appropriate GM Engineering Center. Corrective action shall follow with Five Phase reporting. 3.4.3.1The Functional/Parametric Tests Shall: Validate functionality by monitoring and recording that all outputs are in the correct state for a given set of inputs and timing conditions. V
39、alidate parametrics by monitoring and recording the specific voltage, current, and timing levels for all inputs and outputs and ensuring that these levels meet specification requirements. Selected parameters shall be statistically analyzed to evaluate whether build variations result in an acceptable
40、 degree of performance variation across the sample set. The distribution of the measured values shall not result in a skewed distribution stacked up against a tolerance limit. Selected comparisons shall be made between parametric measurements made on the E/E devices when new, prior to testing, and w
41、hen the DUTs complete the test sequences. Comparisons to the original measurements, individually and as a group statistically, shall be made to identify and quantify any performance degradation. If degradation limits are not specified in the CTS, the supplier and the GM Release engineer shall collab
42、orate to define the degradation acceptance/failure criteria. DUTs shall have the following recovery time prior to Functional/Parametric measurements: 1. 24 h minimum for Water, Humidity and Salt Fog tests 2. 8 h minimum for Temperature tests 3. Recovery time not required for mechanical 3.4.3.2 The C
43、ontinuous Monitoring Tests shall: (Refer to 6.1.1 “Operating Type 3.2”). Validate functionality, while the parts are exposed to the test environment, by continuously monitoring and recording exceptions to all outputs (both hardware and on vehicle communications) not being in the correct state for a
44、given set of inputs and timing conditions. This can be performed by sampling. The sampling rate shall be reviewed with and approved by GM Engineering. All DUT inputs/outputs (including on vehicle communications) shall be continuously cycled and monitored for proper functional operation over all appl
45、icable power modes and battery voltages. The input/output cycling and monitoring shall be automatic for detecting any non-conformance; thereby, not requiring human intervention or observation at any time during the testing. Copyright General Motors Company Provided by IHS under license with General
46、Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14834 Copyright 2013 General Motors Company All Rights Reserved December 2013 Page 5 of 27 The input/output cycling and monitoring should be automatic for recording
47、a non-conformance to specification requirement issue. This may be visual or audible. 3.4.4 Test Criteria. 3.4.4.1 Functional/Parametric Checks. Functional checks of speakers will consist of: Resonant Frequency Reference GMW14833 Speaker Performance Test Specification, section titled Resonant Frequen
48、cy and Impedance Measurement Nominal Impedance Reference GMW14833 Speaker Performance Test Specification, section titled Nominal Impedance Frequency Response Reference GMW14833 Speaker Performance Test Specification, section titled Frequency Response. Only on-axis measurements are required for prete
49、st and posttest validation comparisons Sensitivity Reference GMW14833 Speaker Performance Test Specification, section titled Sensitivity Extraneous noise Reference GMW14833 Speaker Performance Test Specification, section titled Extraneous Noise Visual Inspection Reference 3.4.5 3.4.4.2 Continuous Monitoring Parameters. Speakers under test with continuous monitoring will be checked for continuity. 3.4.5 D
