Product category:
Humidity and Environmental Sensors
News Release from: Bruel and Kjaer UK | Subject: Type 3598 pass-by noise measurement system
Edited by the Engineeringtalk Editorial
Team on 15 June 2000
Pass-by facility for automotive noise
tester
Bruel and Kjaer has launched a new software module for its Pulse measurement system that offers a powerful tool for automotive designers endeavouring to meet tighter noise emission standards.
Sound and vibration measurement specialist, Bruel and Kjaer (B and K) has launched a new software module for its Pulse and Portable Pulse measurement system that offers a powerful tool for automotive designers endeavouring to meet ever tighter noise emission standards The type 3598 pass-by noise measurement system is designed to support a wide range of exterior vehicle noise tests including those specified in ISO 362 and SAE J1470, ISO 13325 (tyre noise) and ISO 5130 (exhaust noise)
This article was originally published on Engineeringtalk on 20 Jun 2008 at 8.00am (UK)
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Combined with the Pulse or Portable Pulse noise analysers, the type 3598 module forms a complete system for pass-by measurements for all exterior noise emissions.
Complete data collection is achieved in a single pass with equidistantly spaced noise spectra being gathered for both sides of the vehicle plus other parameters such as position, velocity, acceleration, engine revs and throttle position.
At the heart of the pass-by measurement system is B and K's Pulse multi analyser which handles the data processing.
Further reading
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The Protector Software can present logged noise exposures, making it much easier to visualise the variation with time of the measured noise levels.
Mapping system quickly sizes up enclosed spaces
Spherical Beamforming provides a complete omnidirectional noise map and makes no assumptions about the nature of the acoustic environment.
Two microphones are connected directly to the Pulse front-end with all other parameters being transferred through the pass-by connection unit.
Two photocells are used to give absolute reference for the position of the car measured by the radar.
Based on this radar data, the car's velocity is calculated.
An optional weather station can also be connected to the pass-by connection unit.
The pass-by vehicle unit is situated in the car and measures engine revs, throttle position and optional parameters such as fan speed.
This information is sent by wireless LAN to the pass-by connection unit with information about speed being transmitted back to a notebook PC in the pass-by vehicle unit.
This enables the driver to see the exact speed on screen during each test run.
An optional sunlight-capable, head-up display can also be used.
In addition, the notebook computer and the Pulse computer (ground station) run under DCOM (Distributed Component Object Model) so any information seen on one PC can be viewed on the other.
This feature enables one person driving the vehicle to complete the pass-by test without assistance.
Windows NT-based software controls all measurements and displays results in numerous combinations and data formats, all optimised for easy export of data to Excel, Word and database programs.
Four standard configurations are available including an entry-level system which excludes the pass-by vehicle unit (for tyre noise measurements only), the standard system and two advanced systems offering post-processing and data back-up facilities.
With over 50 years experience, Brel and Kj?r is a world leading manufacturer and supplier of sound and vibration products for use in a wide range of applications including environmental noise measurements and predictive modelling, building acoustics, R and D in the automotive and aerospace industries and product quality control.
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