USING OF SOUND VISUALISATION TECHNIQUES FOR IDENTIFICATION AND ANALYSIS OF VEHICLE NOISE SOURCES
Pavol Liptai, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)
Marek Moravec, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)
Ján Zbojovský, Technical University of Košice (Letna 9,042 00 Košice, Slovak Republic)
Urgency of the research. The use of continuous measurement on the roads and highways with noise visualization techniques can in the future lead to increasing road safety. Central computer system could for example, evaluate the information continuously and the feedback would have warned drivers, through their mobile phones or GPS, to replace tires in the nearest dealer or car service. Vehicles fault diagnosis is currently carried out by different devices in car services. In terms of increasing the efficiency, diagnostic methods can be extended for noise visualization techniques.
Target setting. Using of measuring devices (for noise visualization) in car services for faster detection of faults and damaged parts as well as based on the measured values of noise pressure level, could be evaluated, if the tires are still safe or not.
Actual scientific researches and issues analysis. Acoustic cameras and various noise visualization techniques are implemented to manufacturing process of passenger car manufacturers. Their use is for detecting errors and for reduction of engine noise and its parts as well as car interior.
Uninvestigated parts of general matters defining. This article provides only partial research and conclusions. Philosophy, to use this noise visualization technique in many cases is different.
The research objective. The aim of this study was to demonstrate the differences in sound levels between two vehicles Skoda Octavia at different speeds at the same road. Partial output is a frequency analysis and identification of dominant sound sources in the engine space of VW Golf 1.4 vehicle.
The statement of basic materials. The methods of dynamic visualization of noise are used all around the world. In our case, we used the acoustic camera to visualize and identify the sound sources of moving vehicle as well sources of noise in the engine space.
Conclusions. It has been found that vibration from the engine are transmit by chassis to the interior of vehicle and cause uncomfortable noise. In the future, we expect the use of such measuring devices in car services for faster detection of faults and damaged parts. When passing vehicles and higher speeds, the biggest noise, the pressure wave in the contact tire-road is causing. Differences in noise pressure levels are mainly due to weight, quality of tires, aerodynamics and the shape and size of the tread.
vehicle, identification, frequency, measurements, noise
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