GB/T 18697-2002 PDF EnglishUS$125.00 · In stock · Download in 9 seconds
GB/T 18697-2002: Acoustics -- Measurement of noise inside motor vehicles Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 18697-2002: Acoustics -- Measurement of noise inside motor vehicles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18697-2002GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 17.140.30 Z 32 eqv ISO 5128.1980 Acoustics - Measurement of noise inside motor vehicles Issued on. MARCH 26, 2002 Implemented on. DECEMBER 01, 2002 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC Table of ContentsForeword... 3 ISO Foreword... 4 1 Scope... 5 2 Normative references... 5 3 Type of test... 5 4 Test quantity... 6 5 Measuring instruments... 6 6 Acoustic environment, meteorological conditions, background noise... 7 7 Test road conditions... 8 8 Vehicle conditions... 8 9 Microphone position... 12 10 Measurement steps... 13 11 Test report... 15 Appendix A (Informative) Measurement record sheet of vehicle interior noise ... 16ForewordThis standard is equivalent to ISO 5128.1980 "Acoustics - Measurement of noise inside motor vehicles". The technical content is consistent. Appendix A (informative) is added, for reference only. This standard was proposed by the Chinese Academy of Sciences. This standard shall be under the jurisdiction of the National Acoustics Standardization Technical Committee. Drafting organizations of this standard. FAW Technology Center, Shanghai Volkswagen Co., Ltd., Shenlong Automobile Co., Ltd. The main drafters of this standard. Lu Bingwu, Liu Shugong, Liu Yingjie, Liu Dongming, Zou Zhenhao, Bao Jingyu, Yao Zuxing.ISO ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote. The international standard ISO 5128 was formulated by the ISO/TC 43 Technical Committee on Acoustics. Acoustics - Measurement of noise inside motor vehicles1 ScopeThis standard specifies the method for measuring the noise inside motor vehicles. This standard applies to category M and category N automobiles (category M. passenger vehicles, including cars; category N. goods vehicles, including tractors, cranes, etc.).2 Normative referencesThe provisions in following documents become the provisions of this Standard through reference in this Standard. The versions indicated at the time of publication of this standard are valid. All standards are subjected to revision, AND parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. GB/T 3241-1998 Octave-band and fractional-octave-band filters (eqv IEC 61260.1995) GB/T 3730.2-1996 Road vehicle - Masses - Vocabulary and codes (idt ISO 1176.1990) GB/T 3785-1983 Electric, sonic properties and measuring methods for sound level meters3 Type of test3.1 Confirmatory test The measurements performed are used to verify, whether the motor vehicles provided by the manufacturer meet the noise requirements. 3.2 Check test The measurements performed are to check whether the noise of the motor vehicle is within the specified limits AND whether there has been a significant change, since the motor vehicle is submitted, or between motor vehicles which are submitted in different batches.4 Test quantity4.1 The reading of the sound level meter used shall use the "F" time-weighting characteristic. 4.2 The measured value of all measuring points, in the confirmatory test and the check test, shall be A sound level LpA, in unit of dB.5 Measuring instruments5.1 The sound level meter shall meet the requirements of Type 1, which is specified in GB/T 3785. 5.2 If other measurement systems are used, such as tape drives or level recorders, their electroacoustic performance shall meet the requirements of Type 1 in the relevant clauses of GB/T 3785. 5.3 In order to measure the noise spectrum, the filter shall meet the requirements of GB/T 3241. 5.4 At the beginning and end of each measurement, the acoustic performance of the measuring device must be checked, in accordance with the manufacturer's instructions. It is best to use an acoustic calibrator (such as a piston sounder) for calibration. The sound level meter shall meet the requirements of Type 1, which is specified in GB/T 3785, within the effective calibration period. 5.5 For automobile acceleration tests, it is particularly recommended to use a dual-channel recording device, which can record noise and vehicle speed signals at the same time. It can obtain a graph of the relationship between vehicle noise and vehicle speed. 5.7 The accuracy of measuring instruments for vehicle speed and engine speed shall be 3% or better.6 Acoustic environment, meteorological conditions,background noise 6.1 The measurement location must meet the following conditions, that is, the sound radiated from the motor vehicle can only become a part of the noise inside the motor vehicle, through the reflection of the road surface; it cannot become the noise inside the motor vehicle, through the reflection of buildings, walls or similar large objects outside the motor vehicle. 6.2 The air temperature outside the motor vehicle must be in the range of -5°C to +35°C. The wind speed, at a height of about 1.2 m, along the measurement route, shall not exceed 5 m/s. Other meteorological conditions shall not affect the measurement results. The wind speed and wind direction, for the direction of motor vehicle, shall be stated in the test report.7 Test road conditionsThe interior noise of a motor vehicle is generally greatly affected by the roughness of the road pavement structure. A smooth road pavement can produce smooth interior noise.8 Vehicle conditions8.1 Engine and tire conditions During the measurement process, all operating conditions of the engine, such as fuel, lubricating oil, ignition timing or fuel injection time, shall comply with the manufacturer's requirements. Before the start of the measurement, the engine shall stabilize, within the normal operating temperature range; OR drive a distance, at a moderate speed. 8.2 Vehicle load The basic conditions of vehicle load shall comply with the provisions of 4.4 or 4.6 in GB/T 3730.2-1996, which are the same as those, as required by motor vehicle manufacturers. The motor vehicle must be unloaded, when testing noise (except for the driver, measurement personnel, test equipment, no other loads are allowed). 8.3 Openings, windows, auxiliary devices, adjustable seats Openings, such as sunroofs, all windows, air inlets, air outlets, must be closed if possible. They shall be opened, only when it is necessary to study their influence on the internal noise of the motor vehicle. 8.4 Vehicle operating conditions The operating conditions, that can represent the interior noise of the tested vehicle, shall be selected from the following three operating conditions.9 Microphone positionSince the noise level in the motor vehicle is obviously related to the measurement location, it shall select sufficient measurement points, that can represent the noise distribution in the motor vehicle, near the ears of the driver and passengers. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 18697-2002 be delivered?Answer: The full copy PDF of English version of GB/T 18697-2002 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 18697-2002_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 18697-2002_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 18697-2002 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 18697-2002?A step-by-step guide to download PDF of GB/T 18697-2002_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 18697-2002". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
