Methodology for Sloshing Noise Measurements and Acoustic Target Definition for SCR Tanks to Improve Comfort

Paper #:
  • 2017-01-1875

  • 2017-06-05
Within recent years, passenger comfort has become a main focus for the automotive industry. The topic is directly connected to acoustics, since sounds and noises have a major impact on the well-being of vehicle occupants. The so-called “noise control” focuses on directly optimizing acoustic comfort by implementing innovative materials or geometries for automotive components and systems. One possibility to optimize the acoustics within a vehicle is connected to the phenomenon of sloshing in selective catalytic reduction (SCR) tanks. Sloshing is a noise which is generated during normal driving situations by the motion of the liquid in the tank. Until now, no valid procedure for measuring the sloshing noise in SCR tanks, or a specific acoustic target which the SCR tanks need to fulfill has been defined. For this reason, It's been developed a reproducible laboratory-based methodology to measure the sound generated by the tank to compare it with a defined sound pressure level target. As a first step the different phenomena of sloshing noise generation have been deeply analyzed (hit, splash, clonk, bubble-jet), each of which can be attributed to a specific movement of the liquid inside the tank. Aiming at a repeatable procedure which reflects the sound level during realistic driving maneuvers, the company designed and constructed a test bench able to reproduce such real driving conditions, evaluating the results according to the identified target. Subsequently, an examination was conducted to assess the transmission paths of the noise from the tank to the vehicle cabin as well as the effects of the engine and driving maneuvers on how the sounds are perceived by passengers. For this purpose, sloshing noises recorded for different tanks were modified in order to prepare psychoacoustic listening sessions and to identify the most important parameters influencing the annoyance.
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