UFSC Uses LabVIEW and NI CompactDAQ for Acoustic Beamforming in Vehicle Pass-By Noise
Acoustic Image Identifying Tire and Exhaust
Noise at 50 KPH at 1,904.3 Hz
Author(s):
Samir N.. Gerges - Federal University of Santa Catarina (UFSC)
The Laboratory of Noise and Vibration at the Federal University of Santa Catarina (UFSC) in Brazil is involved in various projects including R&D assistance to the automobile industry to adapt its products to noise and vibration standards. In addition to helping local industries, this supports academic developments in teaching and research for undergraduate and postgraduate students.
Pass-by noise tests are standardized to quantify the maximum sideline noise level during vehicle operation. The test is regulated in most countries with specific sound limits defined by relevant government agencies, typically ISO 362 – measurement of noise emitted by accelerating road vehicles. The specifications are intended to reproduce the level of noise generated by the principal noise sources during normal driving in urban traffic, typically on roads with speed limits of 50 km/h and 70 km/h. The vehicle pass-by noise test certifies that a car complies with the standard so its contribution to traffic noise is not above the permitted limit.
Many elements contribute to the total noise of a vehicle, such as the motor, exhaust, transmission, and tires. Because standard pass-by noise tests do not have the capacity to identify the sources emitting noise that leads to test failure, we needed technique a to visualize the acoustic field to identify these sources. By applying beamforming in this test, we can see which of these sources significantly contributes to the overall noise emission and has an impact on the vehicle’s pass-by noise.
Cx.P. 476 - Florian.polis
Brazil
Tel: 55) 48-2344074/3319227/3317095
Fax: (55) 48-3319677
samir@emc.ufsc.br
Acoustic Image Identifying Tire and Exhaust Noise at 50 KPH at 1,904.3 Hz
Acoustic Image Identifying Tire Noise at 70 KPH at 1,250 Hz
32-Channel Microphone Array
Layout of Test System
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