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- W2587533638 abstract "Audible noise inside a vehicle compartment has substantial negative impact on the customer opinions on the vehicle quality. Since significant progress has been achieved on reducing the major noise sources, such as powertrain noise and wind noise, traditional minor noise sources, such as the refrigerant flow-induced whistle of the vehicle climate control system, become more audible and annoying due to their high frequency characteristics and the reduced masking level. In this paper, a high-pitched whistle around 6.6 KHz of the climate control system is investigated and studied experimentally and theoretically. A joint on the suction tube is identified as the noise source by a systematic approach. The mechanism of the noise generation, propagation and interaction are studied theoretically. Due to the excessively large gap (around 1 mm) at the joint, a wall cavity is formed at this location. When the R134a refrigerant flows over the joint, the induced tones inside the wall cavity are generated by the low-Reynolds number mean flow and transmitted through the tube walls. The magnitude of the whistle is increased more rapidly during the transmission as the result of the interaction with tube walls when the acoustic diametric mode is coupled with the structural circumferential mode. Good coincidence between the calculated and the tested results is found, which proves the accuracy of the proposed theoretical analysis. The modified design of the joint gap is implemented and the high-pitched whistle is eliminated. Finally, a guideline for suppressing the flow-induced whistle of the vehicle climate control system is provided." @default.
- W2587533638 created "2017-02-17" @default.
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- W2587533638 date "2016-11-11" @default.
- W2587533638 modified "2023-09-27" @default.
- W2587533638 title "Analysis of Flow-Induced Whistle at the Joint of Suction Tube of Vehicle Climate Control System and its Coupling With the Tube Structural Mode" @default.
- W2587533638 doi "https://doi.org/10.1115/imece2016-65247" @default.
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