Browsing by Author "Saati, Ferina"
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- ItemNumerical Modelling of the Acoustic Properties of Polyester Non-woven(TEXTILE BIOENGINEERING & INFORMATICS SOCIETY LTD, TBIS 2010 SECRETARIAT MN104, HONG KONG POLYTECHNIC UNIV, HONG KONG SAR, 0000, PEOPLES R CHINA, 2019) Yang, Tao; Saati, Ferina; Xiong, Xiao-Man; Wang, Yuan-Feng; Yang, Kai; Mishra, Rajesh; Militký, Jiří; Petrů, MichalThis paper investigates the acoustical properties of polyester non-woven by using practical and numerical methods. Several types of non-woven samples made from staple, hollow and bi-component polyester fibres were chosen to carry out this study. The AFD300 Acoustic Flow device was used to measure airflow resistivity. The 45 mm Materiacustica two-microphone impedance tube was used to measure the surface impedance and sound absorption coefficient. Widely used impedance models, such as the Delany-Bazley, Miki, Garai-Pompoli and Komatsu models, were applied to predict acoustical properties. A comparison between measured and predicted values has been performed to derive the most accurate model. The Johnson-Champoux-Allard-Lafarge (JCAL) model was applied to obtain some non-acoustical properties based on the inverse method. It is found that the Delany-Bazley and Miki models can accurately predict the surface impedance of polyester non-woven. The results indicate that the Miki model is the most acceptable method for predicting the sound absorption coefficient, with an 8.39% mean error for all of the samples. The values are 8.92%, 12.58% and 69.67% for the Delany-Bazley, Garai-Pompoli and Komatsu models, respectively. Several difficult-to-obtain parameters have been investigated.
- ItemStudy on the sound absorption behavior of multi-component polyester nonwovens: experimental and numerical methods(2019-08) Yang, Tao; Saati, Ferina; Horoshenkov, Kirill V.; Xiong, Xiaoman; Yang, Kai; Mishra, Rajesh; Marburg, Steffen; Militký, JiříThis study presents an investigation of the acoustical properties of multi-component polyester nonwovens with experimental and numerical methods. Fifteen types of nonwoven samples made with staple, hollow and bi-component polyester fibers were chosen to carry out this study. The AFD300 AcoustiFlow device was employed to measure airflow resistivity. Several models were grouped in theoretical and empirical model categories and used to predict the airflow resistivity. A simple empirical model based on fiber diameter and fabric bulk density was obtained through the power-fitting method. The difference between measured and predicted airflow resistivity was analyzed. The surface impedance and sound absorption coefficient were determined by using a 45 mm Materiacustica impedance tube. Some widely used impedance models were used to predict the acoustical properties. A comparison between measured and predicted values was carried out to determine the most accurate model for multi-component polyester nonwovens. The results show that one of the Tarnow model provides the closest prediction to the measured value, with an error of 12%. The proposed power-fitted empirical model exhibits a very small error of 6.8%. It is shown that the Delany-Bazley and Miki models can accurately predict surface impedance of multi-component polyester nonwovens, but the Komatsu model is less accurate, especially at the low-frequency range. The results indicate that the Miki model is the most accurate method to predict the sound absorption coefficient, with a mean error of 8.39%.