Determination of noise from motor vehicles during acceleration

The material testing procedure for Determination of noise emitted by accelerating road vehicles aims to determine the noise generated when motor vehicles accelerate; control noise, control quality during production, optimize research and development...

Overview of the material testing procedure for Determination of noise emitted by accelerating road vehicles

Test name: Determination of noise emitted by accelerating road vehicles

Test method: method:

ISO 362-1: 2007: Measurement of noise emitted by accelerating road vehicles – Engineering method – Part 1: M and N categories [1].

ISO 362-2: 2009: Measurement of noise emitted by accelerating road vehicles – Engineering method – Part 2: L category [2].

ISO 362-3: 2016: Measurement of noise emitted by accelerating road vehicles – Engineering method – Part 3: Indoor testing M and N categories [3].

ISO 9645:1990: Acoustics – Measurement of noise emitted by two-wheeled mopeds in motion – Engineering method.

Performed at:

+ Field.

+ Or: Sound Absorption Laboratory, DASM Institute.

Objectives & test subjects

1.1. Test objectives objectives

Determine the noise generated when motor vehicles accelerate

1.2. Test subjects

Road motor vehicles.

– This part of ISO 362-1 specifies an engineering method (field) to measure noise emitted by road vehicles of categories M and N under typical urban traffic conditions. Note that the semi-anechoic chamber method can be used for M and N vehicles, as specified in ISO 362-3.

– Vehicles of categories L1 and L2 shall fall within the scope of ISO 9645. Vehicles of categories L3, L4, and L5 shall fall within the scope of ISO 362-2. See Figure 2 for L category vehicle classification.

Category M:

Category M – Motor vehicles with at least four wheels used for the carriage of passengers
Category	Vehicle Description
M1	Vehicles designed and constructed for the carriage of passengers and having no more than eight seats in addition to the driver's seat and having a maximum mass ("technically permissible maximum laden mass") not exceeding 3.5 tonnes >9 seats, carrying load < 3.5 tonnes
M2	Vehicles designed and constructed for the carriage of passengers, having more than eight seats in addition to the driver's seat and having a maximum mass ("technically permissible maximum laden mass") not exceeding 5 tonnes >9 seats, carrying load < 5 tonnes
M3	Vehicles designed and constructed for the carriage of passengers, having more than eight seats in addition to the driver's seat and having a maximum mass exceeding 5 tonnes > 9 seats, carrying load > 5 tonnes

Category N:

Category N – Power-driven vehicles having at least four wheels used for the carriage of goods
Category	Vehicle Description
N1	Carrying load not exceeding 3.5 tonnes
N2	Carrying load from 3.5 to 12 tonnes
N3	Carrying load exceeding 12 tonnes

The above classification is defined in the Consolidated Resolution on the Construction of Vehicles [4].

Test procedure test procedure procedure

+ Procedure development

+ Data processing and reporting

Detailed test conditions

3.1. Equipment and test environment

This is a field experiment, the equipment and tools used include:

– Microphone (arranged according to standard diagram)

– Signal conversion equipment;

– Computer for data acquisition and processing.

3.2. Notes on test conditions

– The error of the microphone placement distance (Figure 2) to the center line of the vehicle travel path CC' must ensure a deviation of 7.5  0.5 m (height of the microphone to the road surface 1.2  0.02 m);

– The test location must be flat. The structure and surface of the test track must meet the requirements of ISO 10844. The dimensions of the test location are shown in Figure 2.

– Within a radius of 50 m around the center of the test track, the space must not contain large reflectors such as fences, rocks, bridges, or buildings. The test track and surface of the site must be dry and free of sound-absorbing materials such as powdery snow or loose debris.

– In the vicinity of the microphone, there shall be no obstacles that could affect the sound field and no person shall be between the microphone and the noise source. The meter observer shall stand in a position so as not to affect the meter reading.

3.3. Regarding the vehicle:

– The vehicle must conform to the manufacturer's original design.

– Before starting the measurement, the vehicle must be brought to normal operating conditions.

– The difference in results between runs can be reduced if there is a 1-minute waiting time (at idle in N gear) between runs.

The role – and importance of the Testing procedure Determination of noise emitted by accelerating motor vehicles

The Testing procedure for Determination of noise emitted by accelerating motor vehicles conducted by the DASM Institute provides useful information, meeting the practical needs of customers and enterprises wishing to:

• Determine the noise generated when motor vehicles accelerate.
• Achieve certification in accordance with regulations.
• Compare different motor vehicles/vehicle models.
• Evaluate the user experience regarding vehicle sound comfort.
• Test motor vehicle operating conditions during acceleration related to pedestrian safety.
• Control noise and quality during the production process, and optimize research and development for products, materials, components, etc., related to noise emitted from accelerating motor vehicles.
• Have a verified basis to propose and implement solutions prioritizing components, parts, and products, etc., with improved engineering and technology for noise emitted from accelerating motor vehicles.

If previously you had concerns and worries, and had to spend substantial fees for similar activities abroad, now you only need to contact DASM. The entire remaining process will be proactively and comprehensively handled by us in the shortest time to complete the customer experience with us: DASM provides acoustic consulting services with superior quality, competitive pricing in the industry, and dedicated, attentive customer care policies.

The significance of acoustic testing services at DASM

Today's globalized commercial life opens up countless new markets and sources of supply across five continents. Accompanied by this are international regulations and standards that help customers easily evaluate quality – trace product origin, and select suitable/superior items. In particular, they support manufacturers in continuously improving and perfecting technology, engineering, raw materials, production and sales methods, etc.

The DASM Institute is a pioneering, comprehensive, professional, and leading prestigious brand in Vietnam in the field of acoustics. On January 12, 2023, DASM was granted certificate number 114/TĐC – HCHQ by the Directorate for Standards, Metrology and Quality (Ministry of Science and Technology), certifying the registration of multi-sector testing activities in the Mechanical-Physical field (registration number: 707/TN – TĐC).

Our acoustic testing services provide customers with practical professional results to meet sustainability, standard performance, and optimal solutions – consulting – design calibration for products and services. From there, you will update, meet, and adapt to constantly changing international standards to achieve breakthroughs in revenue and profit, and elevate your brand.

If you have a need to perform the Testing procedure Determination of noise emitted by accelerating motor vehicles, please contact via Hotline for detailed consultation!