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1、General Specification Electrical Function GMW14833 Speaker Performance Test Specification 1Introduction2 1.1Scope2 1.2Mission / Theme2 1.3Classification2 2References2 2.1External Standards/Specifications2 2.2GM Group Standards/Specifications2 2.3Additional References2 3Test Preparation and Evaluatio
2、n2 3.1Resources2 3.1.1Calibration2 3.1.2Alternatives2 3.1.3Facilities2 3.1.4Equipment2 3.1.5Test Vehicle / Test Piece2 3.1.6Test Time2 3.1.7Test Required Information2 3.1.8Personnel / Skills2 3.2Preparation2 3.3Conditions2 3.3.1Environmental Conditions2 3.3.2Test Conditions3 3.4Instructions3 3.4.1Pr
3、econditioning3 3.4.2Crossover Network3 3.4.3Test Discrepancies or Non-Conformance 3 3.4.4Electrical Connections3 3.5Data3 3.6Safety3 3.7Documentation3 3.7.1Test Results3 3.7.1.1 Measurement Conditions3 3.7.1.2 Test Results Numerical Data4 3.7.1.3 Test Results with Data Plots4 3.7.2Deviations from Te
4、st Procedure4 3.8Design Cycle Requirements4 4Requirements and Procedure4 4.1Speaker Component Performance Test 4 4.1.1Resonant Frequency (Free Air) Test4 4.1.2Impedance5 4.1.2.1 Impedance Curve5 4.1.2.2 Nominal Impedance - Calculated5 4.1.2.3 Nominal Impedance - Measured5 4.1.3Frequency Response Tes
5、t5 4.1.4Power Compression Test6 4.1.5Loudspeaker Excursion Control (Hi-2 Distortion Test) 6 4.1.6Extraneous Noise9 4.1.7Sensitivity (SPL)10 4.1.8Power Rating Test10 4.1.9Thiele/Small Parameters10 4.1.9.1 Total Quality (Qt)10 4.1.9.2 Electrical Quality (Qes)10 4.1.9.3 Mechanical Quality (Qms)10 4.1.9
6、.4 Equivalent Volume (Vas)10 4.1.9.5 Surface Area of Cone (Sd)10 4.1.9.6 Total Moving Mass (Mms)10 4.1.9.7 DC resistance (Rdc)10 4.1.9.8 Linear Excursion (Xmax)10 4.1.10Power Linearity10 4.1.11Total Harmonic Distortion11 4.1.12Impulse Response12 4.1.13Cumulative Spectral Decay12 4.1.14Energy Time Cu
7、rve12 5Provisions for Shipping12 6Notes12 6.1Glossary12 6.2Acronyms, Abbreviations and Symbols 12 7Additional Paragraphs13 8Coding System13 9Release and Revisions13 9.1Release13 Copyright 2007 General Motors Corporation All Rights Reserved Publication Department: GME Specification Center July 2007Pa
8、ge 1 of 13 PRD045 - VPRE ST 1 10/03 -,-,- GMW14833GM WORLDWIDE ENGINEERING STANDARDS 1 Introduction Note: Nothinginthis standard supersedes applicable laws and regulations. Note: In the event of a conflict between the Eng- lish and the domestic language, the English language shall take precedence. T
9、his document is the GM World Standard for loud- speaker component performance testing procedures for automotive and light duty truck applications. The Component Technical Specification (CTS) and Sub-System Technical Specification (SSTS) shall take precedence over this document. In the event of a con
10、flict between the text of this spec- ification and the documents cited herein, the text of this specification takes precedence. 1.1 Scope. This document establishes a centralized set of electrical and mechanical performance tests GM Loudspeaker Components and Subsystems. Performance requirements sha
11、ll be established in accordance to the SSTS, and CTS for each appro- priate level. The supplier is required to support and participate in subsystem or vehicle level A/D/V tasks as specified in the Statement of Requirements (SOR), CTS, or by GM Engineering. 1.2 Mission / Theme. Provides established c
12、ommon loudspeaker performance tests or methods for GM that will be delegated to be performed either on the vehicle, buck, subsystem, component, and/or bench. 1.3 Classification. This standard applies to all loud- speakers and any of their external components used in cars and light-duty trucks. 2 Ref
13、erences Note: Only the latest approved standards are appli- cable unless otherwise specified. 2.1 External Standards/Specifications. IEC 61672-1 IEC 60268-5 IEC 60225 ISO/IEC 17025 EIA RS-426-B QS9000 2.2 GM Group Standards/Specifications. GMW3059 2.3 Additional References. None. 3 Test Preparation
14、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 test facilities and equipment may also be used. However, all measur- ing variables as specified in this specifica
15、tion shall be determined correctly with respect to its physical definition. 3.1.3 Facilities. The test facilities shall be QS9000 and/or ISO/IEC 17025 certified. 3.1.4 Equipment. 3.1.4.1 Anechoic test chamber. 3.1.4.2 Electrodynamics vibration generator within a frequency range of (10.2000) Hz. 3.1.
16、4.3 DC sources 5 V. 3.1.4.4 Sine-wave noise generator. 3.1.4.5 Test signals: Sine-wave signals to IEC 60268-5. Broadband/narrow-bandnoiseaccordingto IEC 60268-5. 3.1.4.6 LF amplifier according to IEC 60268-5. 3.1.4.7 Microphone amplifier and measuring micro- phone according to IEC 60268-5. 3.1.4.8 T
17、hird-octave filter according to IEC 60225. 3.1.4.9 Ohmicresistorsuitedtothenominal impedance of the loudspeaker with an accuracy of 1 % and a loading capacity of 20 W. 3.1.4.10 Sound baffle to IEC 60268-5. 3.1.4.11 Voltmeter according to IEC 61672-1. 3.1.4.12 Frequency analyzer. 3.1.4.13 Acoustic me
18、asuring environment according to IEC 60268-5. 3.1.4.14 Timer. 3.1.5 Test Vehicle / Test Piece. The test samples shall be production intent design and materials for performance testing. The supplier shall test at least 10 sample parts to this specification. 3.1.6 Test Time. Not applicable. 3.1.7 Test
19、 Required Information. Not applicable. 3.1.8 Personnel / Skills. Not applicable. 3.2 Preparation. See paragraph 3.4. 3.3 Conditions. Copyright 2007 General Motors Corporation All Rights Reserved Page 2 of 13July 2007 PRD045 - VPRE ST G 10/03 GM WORLDWIDE ENGINEERING STANDARDSGMW14833 3.3.1 Environme
20、ntal Conditions. Not applicable. 3.3.2 Test Conditions. Unless stated otherwise, the followingshalldefine the test environmentparameters and tolerances to be used for all validation testing: Table 1: Parametric Tolerances ParameterTolerance Room Ambient Temperature (+23 5) C Test Timespec +2 / -0 %
21、Room Ambient Relative Humidity (50 20) % Chamber Humidityspec 5 % Voltage spec 0.1 V (as measured at the module) 3.4 Instructions. 3.4.1 Preconditioning. All speakers are to be condi- tioned prior to testing per IEC 60268-5 paragraph 12 Preconditioning. 3.4.2 Crossover Network. Unless otherwise spec
22、- ified if a crossover external to the loudspeaker driver exists, testing shall be done with the external crossover in place. 3.4.3 Test Discrepancies or Non-Conformance. All non-conforming parts shall be analyzed using a 5-phase evaluation and answer process. A complete documented response, in a fo
23、rmat shown below shall be presented to the Platform/Program Validation Engineer. 1 Analysis Findings What is learned from the incident at component, assembly, and vehicle levels. Measures taken to search for the root cause. How did you proceed with the investigation? 2 Root Cause Ultimate root cause
24、 of the incident. 3 Immediate Fix What will be done to quarantine and correct con- taminated stock. 4 Irreversible Corrective Action To prevent the incident from ever occurring again. Traceabledocument(engineeringchange, process change, etc.). Projected date of implementation. 5 Planned Action Verif
25、ication Verification that irreversible corrective action works. 3.4.4 Electrical Connections.The DUTs shall be terminated with production intent connectors and all harness side mating connectors, terminals and wiring even if unpowered for testing. 3.5 Data. See paragraph 3.7 and paragraph 4. 3.6 Saf
26、ety.This standard may involve hazardous materials, operations and equipment. This standard does not propose to adress 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 applicab
27、ility of regulatory limitations prior to use. 3.7 Documentation. Any change to the component or material e.g.design, function, properties, man- ufacturing process and/or location of manufacture requires a new release of the product. It is the sole responsibility of the supplier to provide the custom
28、er, unsolicited, with documentation of any change or modification to the product/process, and to apply for a new release. 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 ca
29、ses a shorter test can be agreed to between the responsible GM Department and the supplier. 3.7.1 Test Results. All test results shall be included in a test report. This report shall be delivered to the responsible GM department. All running records of data collection shall be retained and made avai
30、lable to GM if requested. All data reports will be on 8.5” x 11” paper. 3.7.1.1 Measurement Conditions. For each test the supplier will detail the following: a Test room: (manufacturer, model) . . . . . . . . . . b Test room size: (.m x .m x.m) . . . . . . . . . . c Test room lower cut-off frequency
31、:. . . . . . . . . . d Measurement microphone: . . . . . . . . . . . . . . e Measurement equipment: . . . . . . . . . . . . . . . f Microphone distance:. . . . . . . . . . . . . . . . . . . g Measurement signal: . . . . . . . . . . . . . . . . . . Copyright 2007 General Motors Corporation All Rights
32、 Reserved July 2007Page 3 of 13 PRD045 - VPRE ST U 10/03 -,-,- GMW14833GM WORLDWIDE ENGINEERING STANDARDS 3.7.1.2 Test Results Numerical Data. Paragraphs that have a numerical result shall be listed as the fol- lowing: Paragraph Number, Test Name, Sample #, CTS DefinedRequirement,TestResult,Deviatio
33、n, Pass/Fail. Example:paragraph 4.1.7 Sensitivity, Sample #1, 88 dB, 89 dB, 1.1 % Pass. 3.7.1.3 Test Results with Data Plots. Each para- graph that has a result that includes a data plots shall be printed on single page. The requirements for the plots are detailed in each paragraph. 3.7.2 Deviations
34、 from Test Procedure. Deviations from the requirements of the test procedures shall have been agreed upon.Such requirements shall be specified on component drawings, test certificates, reports etc. 3.8 Design Cycle Requirements.Loudspeaker Component Validation is a multilevel matrix requiring analys
35、is, testing, inspection or other activities. The subsystem validation consists of Reliability estimates (e.g. Reliability Block Diagram, RBD, or Fault Tree Analysis, FTA with the parts reliability information from parts databases or vendor life test results, and for mechanical parts, from mechanical
36、 engineering stress/strength or finite element analysis), Failure Mode and Effects Analysis, FMEA, of design and pro- duction process (DFMEA and PFMEA), and reliability validation or demonstration testing. Design FMEAs may be required at different phases of the design cycle (4 VDP 4 Phase Vehicle De
37、velopment Process). Each of these (analyses and /or tests) may be performed at a vehicle or at a component, level. Analyticalresultsofreliabilityestimates,when detailed and defensibly accurate, may be a substitute for reliability testing.Also, reliability demonstration test may be done in lieu of a
38、complex reliability analysis.The optimal deliverables would include both, analytical estimates and the demonstration test results with the description of the test methodology that was applied in reliability demonstration. 4 Requirements and Procedure The qualification and validation requirements spe
39、ci- fied herein shall be conducted using one or more of the validation methods defined below: TEST: Verifying that a specification requirement is met by;thoroughly exercising the item being validated under specified conditions in accordance with a test procedure; collecting quantitative data via tes
40、t instrumentation; reducing and analyzing the collected data; and, comparing the results to the specified requirement. ANALYSIS: Verifying that a specification requirement is met by technical or mathematical evaluation of equations, algorithms, recorded data, charts, graphs, circuit diagrams, and re
41、presentative data; and/or simulation of the item being validated using a math- ematical representation (i.e., mathematical models, algorithms, or equations). INSPECTION: Verifying that a specification is met by the physical examination of the item being validated and comparing the observed physical
42、characteristics with the specifications and/or drawings. DEMONSTRATION: Verifying that a specification requirement is met by exercising the item being validated, under specified conditions in accordance with a test procedure, observing the results, and comparing the results to the specified requirem
43、ents. The collection of test data via test instrumentation is normally not required. VALIDATION: The formal process of confirming, throughanalysis,demonstrations,inspections, and/or tests, that a product meets its requirements. 4.1 Speaker Component Performance Test.All testing shall be conducted wi
44、th actual vehicle loads or equivalent (simulated loads require GM Engineering approval) and requires a vehicle interface harness that has a terminal and wire inserted into each connector cavity per the production intent design. 4.1.1 Resonant Frequency (Free Air) Test.The speaker resonance shall be
45、measured in free air by means of the circuit in Figure 1. The voltage at V1 is varied based on speaker impedance such that the power input to the speaker shall be 1 W.Any external crossover components shall be removed or bypassed. The output frequency of the test generator shall be adjusted for a vo
46、ltage minimum across the sense resistor R1 as measured by voltmeter V2 to determine the free air resonance.R1 shall have a resistance value not exceeding 1/10 of the rated impedance value of the loudspeaker under test. Allowable deviation is 15 %. Copyright 2007 General Motors Corporation All Rights
47、 Reserved Page 4 of 13July 2007 PRD045 - VPRE ST G 10/03 GM WORLDWIDE ENGINEERING STANDARDSGMW14833 Figure 1: Resonant Frequency Circuit 4.1.2 Impedance. 4.1.2.1 Impedance Curve.The impedance curve shall be measured per IEC 60268-5. The measured impedance shall not fall below the impedance curve spe
48、cified in the relevant CTS. The data report format shall be: Data Curve Color - Blue x-axis: frequency Hz x-range: (20.20 000) Hz x-scale: log y-axis: impedance y-range: as necessary y-scale: linear steps: 30 points per octave 4.1.2.2 Nominal Impedance - Calculated.The speakernominal impedanceshallb
49、etakenas 1.15 times the value at the first impedance minimum occurring above the resonant frequency measured by means of the circuit given in Figure 1.This will occur at the frequency corresponding to the first voltage maximum measured by voltmeter V2. Speaker impedance shall be measured at the voice coil resonance voltage V1 indicated in paragraph 4.1.1. Any external crossover components shall be removed or bypassed. The output frequency of the test gene