Wavelet Transform Of Acoustic Signal From A Ranque- Hilsch Vortex Tube

7th International Conference on Cooling & Heating Technologies

材料科学;物理学

Istihat, Y.^1 ; Wisnoe, W.^1

Faculty of Mechanical Engineering, Universiti Teknologi MARA (UiTM), Shah Alam, Selangor Darul Ehsan

40450, Malaysia^1

关键词: Analog to digital converters;    Data acquisition system;    Frequency Analysis;    Pressure variations;    Ranque-Hilsch vortex tube;    Temperature differences;    Time frequency analysis;    Working frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/88/1/012005/pdf
DOI  :  10.1088/1757-899X/88/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper presents the frequency analysis of flow in a Ranque-Hilsch Vortex Tube (RHVT) obtained from acoustic signal using microphones in an isolated formation setup. Data Acquisition System (DAS) that incorporates Analog to Digital Converter (ADC) with laptop computer has been used to acquire the wave data. Different inlet pressures (20, 30, 40, 50 and 60 psi) are supplied and temperature differences are recorded. Frequencies produced from a RHVT are experimentally measured and analyzed by means of Wavelet Transform (WT). Morlet Wavelet is used and relation between Pressure variation, Temperature and Frequency are studied. Acoustic data has been analyzed using Matlab®and time-frequency analysis (Scalogram) is presented. Results show that the Pressure is proportional with the Frequency inside the RHVT whereby two distinct working frequencies is pronounced in between 4-8 kHz.