Analysis of acoustic propagation of automotive cooler during run up and run down

Abstract

The modern automotive industry invests more and more in electric drive technology. As a result, new challenges arise in terms of vibroacoustic optimization of the car interior. Components that were once masked by the internal combustion engine are starting to dominate the interior of vehicles. There is therefore a great need for noise reduction. For this purpose, a number of methods of its reduction are used, i.e. component optimization (source), use of active noise reduction systems or passive soundproofing materials. In order to perform the abovementioned noise reduction measures, appropriate measurements and signal analysis should be carried out. This presentation aims to present the measurement of an automotive air cooler in transient states on the stand. Measurements were made using a 3D intensity probe based on the direct measurement of the acoustic particle velocity, in 3 planes in front of the cooler. Then, order tracking analysis was performed for the run-up and coast-down. The results in the form of selected orders of intensity and acoustic particle velocity were compared with classical results made with the use of a microphone at the same measurement points locations.

Measurements of acoustic response of car interion for structural excitations

“…The main focus of the authors' research, is to propose a method of measuring inside the car using vector sound sensors. This paper is a continuation of the research conducted by the authors [10] and related to the use of p-u 3D sound intensity probes to identification (identifying which element is emitting the unwanted sound in car interior) and localisation (through the vector property of sound intensity or its component, the acoustic particle velocity). The technique of using vector sound transducers, not only sound intensity probes but also ambisonic microphones was of interest to the authors in the context of sound source identification in continuous environmental noise monitoring [4].…”

“…Previous research by the authors [10] presented measurements of an automotive transient air cooler on the bench. Measurements were made using a 3D sound intensity probe WA301 Weles Acoustics based on direct measurement of acoustic particle velocity, in 3 planes in front of the radiator.…”

“…However, in a car, there are many sound sources with an interpenetrating timefrequency structure, and information from microphones recording sound pressure as a scalar quantity alone is difficult to interpret and identify the source. So, to obtain information about the significance and direction, measurements based on vector values such as sound intensity or acoustic particle velocity should be used [1,2,4,5,8,10,13,15,17,18].…”

An Application of the DHI Methodology for a Comparison of SARS-CoV-2 Epidemic Hazards in Customer Delivery Services of Smart Cities

“…Sensing technologies are also widely used for monitoring the performance of vehicles [3,4] and more and more often, transport infrastructure [5]. Sensing technologies allow to monitor not just the safety performance of means of transport but also comfort [6] and reliability [7]. Smart cities sensing is an emerging paradigm to facilitate the transition into smart city services [8].…”