GB/T 44040-2024 PDF EnglishUS$305.00 · In stock · Download in 9 seconds
GB/T 44040-2024: Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions 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 44040-2024: Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions---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/GBT44040-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.040 CCS T 34 Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions Issued on: MAY 28, 2024 Implemented on: JANUARY 01, 2025 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Measuring instruments... 6 5 Measuring conditions... 7 6 Measuring requirements and methods... 9 Annex A (informative) Measurement records of noise emitted by heavy-duty vehicles in multiple driving mode conditions... 14 Bibliography... 17 Measurement methods for noise emitted by heavy-duty vehicles in multiple driving mode conditions1 ScopeThis document specifies the terms and definitions, measuring instruments, measuring conditions, measuring requirements and methods for the measurement of noise emitted by heavy-duty vehicles in multiple driving mode conditions. This document is applicable to the measurement of noise emitted by heavy-duty M3, N2, N3 and M2 vehicles with a maximum gross mass greater than 3500 kg, in multiple driving mode conditions.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 3730.1, Terms and definitions of motor vehicles -- Trailers and combination vehicle -- Part 1.Type GB/T 3730.2, Road vehicle. Masses. Vocabulary and codes GB/T 3785.1, Electroacoustics -- Sound level meters -- Part 1.Specifications GB/T 12534, Motor vehicles. General rules of road test method GB/T 15089, Classification of power-driven vehicles and trailers GB/T 15173, Electroacoustics -- Sound calibrators GB/T 19596, Terminology of electric vehicles GB/T 22157, Acoustics -- Specification of test tracks for measuring noise emitted by road vehicles and their tyres GB/T 38146.2, China automotive test cycle -- Part 2.Heavy-duty commercial vehicles3 Terms and definitionsFor the purposes of this document, the terms and definitions defined in GB/T 3730.1, GB/T 3730.2, GB/T 15089, GB/T 19596, GB/T 38146.2 as well as the followings apply. 3.1 test mass mt The mass of different types of test vehicles used for noise testing after being loaded according to different load conditions. NOTE. The unit is kilogram (kg). 3.2 total power of vehicle Pn The total power of the power sources that directly drive the vehicle. NOTE 1.The unit is kilowatt (kW). NOTE 2.The total power of a vehicle using a fuel engine refers to the maximum net power of the engine measured in accordance with GB/T 17692.The total power of a pure electric vehicle refers to the sum of the peak powers of all drive motors measured in accordance with GB/T 18488.2.The total power of a hybrid vehicle refers to the sum of the maximum net power of the engine measured in accordance with GB/T 17692 and the peak power of the drive motor measured in accordance with GB/T 18488.2.The total power of a fuel cell vehicle refers to the peak power of the drive motor measured in accordance with GB/T 24554. 3.3 engine speed at maximum net power According to GB/T 17692, the engine speed corresponding to the maximum net power output. NOTE 1.The unit is revolutions per minute (r/min). NOTE 2.If the engine can obtain maximum net power at different speeds, the highest speed corresponding to the maximum net power of the engine is the maximum net power speed. 3.4 reference point A positioning point used to represent the vehicle position when making noise measurements on a test vehicle. NOTE 1.For test vehicles with front-mounted engines (drive motors), the reference point is the frontmost point of the test vehicle. For test vehicles with mid-mounted or rear-mounted engines (drive motors), the reference point is the edge of the engine (drive motor) near the front end of the test vehicle in the direction of travel. NOTE 2.For test vehicles with multiple drive motors, when the main drive motor or the front drive motor (multiple drive motors have equal power) is placed in front, the reference point is the frontmost point of the test vehicle. When the main drive motor or the front drive motor (multiple drive motors have equal power) is placed in the middle or rear, the reference point is the edge of the main drive motor or the front drive motor close to the front end of the test vehicle in the driving direction.4 Measuring instruments4.1 Acoustic measuring instruments The sound level meter or other equivalent measurement system used for measurement shall meet the requirements of Class 1 sound level meter specified in GB/T 3785.1 (including windshield if applicable). When measuring, the "F" time weighting characteristic and "A" frequency weighting characteristic of the sound level meter shall be used. When using a sound level meter or measurement system that can automatically collect and measure the "A" weighted sound pressure level, the reading time interval shall not exceed 30 ms. 4.2 Calibration of acoustic measuring instruments Before and after the measurement, the acoustic measuring instrument shall be calibrated with a Class 1 sound calibrator that complies with the provisions of GB/T 15173. Without any further adjustment, if the difference between the last calibration reading and the previous calibration reading exceeds 0.5 dB(A), the measurement result after the previous calibration shall be deemed invalid. 4.3 Other measuring instruments The measuring instruments shall include the following equipment. The accuracy shall meet the following requirements. a) Speed measuring instrument. ±2%; b) Vehicle speed measuring instrument. ±0.5%; c) Thermometer. ±1℃; d) Anemometer. ±1.0 m/s; e) Barometer. ±0.5 kPa; f) Relative humidity meter. ±5%; g) Tire pressure gauge. ±10 kPa.5 Measuring conditions5.1 Measuring site The measuring site shall comply with the relevant provisions of GB/T 22157 and be kept clean and dry. 5.2 Measuring area The measuring area dimensions and microphone arrangement are shown in Figure 1. The AA' line is the acceleration start line. The BB' line is the acceleration end line. The CC' line is the center line of the driving lane. The measuring section length is 2× (10 m±0.05 m). The microphone height above the ground shall be 1.2 m±0.02 m. Meteorological parameter measuring instruments shall be placed near the measurement site, at a height of 1.2 m ± 0.02 m from the ground. 5.3 Environmental requirements Measurements shall not be made under adverse weather conditions. During noise measurements, the ambient temperature shall be between 5°C~40°C (the lowest ambient temperature can be 0°C), and the wind speed (including gusts) at the close to the PP' line. 6.3.1.2 Start the test vehicle until the engine speed or power system is stable. Measure the maximum "A" weighted sound pressure level Lstart, j on both sides during the whole process (the unloading noise of the compressed air system is not included). Keep it to one decimal place. 6.3.1.3 Measure the starting condition noise twice in succession. If the difference between the two measurement results on the same side of the test vehicle is not greater than 2 dB(A), the measurement result is valid. Record the speed of the test vehicle after each measurement of the engine stabilization ntest,j, and keep it to an integer. Take the arithmetic average of the two valid noise measurement results on each side. Take the higher value of the arithmetic average of both sides. Keep it to one decimal place as the starting condition noise result Lstart. 6.3.2 Low-speed acceleration conditions 6.3.2.1 Vehicle speed and engine speed conditions When the reference point passes through the BB' line, the vehicle speed vtest shall be within the range of 30 km/h ± 2 km/h. The engine speed ntest shall not exceed 90% S. If the test vehicle's acceleration performance is limited, the test vehicle speed can be adjusted appropriately and noted in the record sheet. 6.3.2.2 Gear selection 6.3.2.2.1 Test vehicle capable of locking transmission ratio The test vehicle shall be selected that can accelerate stably, with the vehicle speed and engine speed meeting the conditions in 6.3.2.1, and the gear position where ntest is closest to 90%S shall be measured. 6.3.2.2.2 Test vehicle with transmission ratio that cannot be locked The gear selector shall be in the fully automatic position. During the measurement, the test vehicle is allowed to shift into a lower gear with greater acceleration, but not into a higher gear with less acceleration (except after the reference point passes the BB' line). Electronic or mechanical devices are allowed to prevent the test vehicle from downshifting to a gear that is not commonly used for road driving during the measurement. 6.3.2.3 Measuring methods The vehicle speed and engine speed conditions of 6.3.2.1 and the gear position of 6.3.2.2 are used for measurement. When the reference point passes through the AA' line, the accelerator pedal is pressed to the bottom as quickly as possible (the test vehicle shall not be downshifted to a gear position that is not commonly used for road driving). Keep the accelerator pedal pressed until 5 m after the reference point passes through the BB' line, and then release the accelerator pedal according to the requirements of the vehicle manufacturer. 6.3.2.4 Measurement results Take two measurements on each side of the test vehicle. Record the maximum "A" weighted sound pressure level Llow acc,j of the test vehicle each time it passes through the measuring area. If the difference between the two measurement results on the same side of the test vehicle is not greater than 2 dB(A), the measurement result is considered valid. During the measurement process, record the vehicle speed vAA',j when the test vehicle passes the AA' line and the vehicle speed vtest,j when it passes the BB' line each time and keep them to one decimal place, and the engine speed nAA',j and ntest,j and keep them to an integer. Take the arithmetic average of the two valid noise measurement results on each side. Take the higher value of the arithmetic average of both sides and keep it to one decimal place as the low-speed acceleration condition noise result Llow acc. 6.3.3 Noise test at medium and high-speed conditions 6.3.3.1 Vehicle speed and engine speed conditions The vehicle speed vtest for the noise in the medium and uniform speed condition shall be within the range of 50 km/h±2 km/h. The vehicle speed vtest for the noise in the high and uniform speed condition shall be within the range of 80 km/h±2 km/h. The engine speed ntest for both medium and high-speed conditions shall not exceed 80%S. If the test vehicle's maximum speed, acceleration performance, and measurement site are limited, the test vehicle speed may be adjusted appropriately and noted in the record sheet. 6.3.3.2 Gear selection 6.3.3.2.1 For test vehicles that can lock the transmission ratio, the highest gear that can stably accelerate and whose vehicle speed and engine speed meet the conditions in 6.3.3.1 shall be selected for measurement. 6.3.3.2.2 For test vehicles that cannot lock the transmission ratio, the gear selector shall be placed in the fully automatic operation position. 6.3.3.3 Measuring methods Use the vehicle speed and engine speed conditions of 6.3.3.1 and the gear position of 6.3.3.2 to carry out the noise measurement under uniform speed. The test vehicle passes through the measuring area at a uniform speed. Maintain the speed until the reference point passes 5 m after the BB' line. Release the accelerator pedal according to the requirements of the vehicle manufacturer. ......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 44040-2024 be delivered?Answer: The full copy PDF of English version of GB/T 44040-2024 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 44040-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 44040-2024_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 44040-2024 -- 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 44040-2024?A step-by-step guide to download PDF of GB/T 44040-2024_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 44040-2024". 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 |
