Active Absorption of Perforated Plate Based on Airflow

• Published in: 东华大学学报（英文版） Vol. 39; no. 6; pp. 590 - 596
• Main Authors: ZHANG Renqi, ZHU Congyun, DING Guofang, HUANG Qibai
• Format: Journal Article
• Language: English
• Published: School of Mechatronics Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China%School of Mechanical Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,China 31.12.2022
• Subjects: perforated plate; absorption coefficient; resonance; active absorption; airflow
• DOI: 10.19884/j.1672-5220.202107010
• ISSN: 1672-5220

TB53; The theory of active absorption of the perforated plate is proposed in this paper. The perforated plate is used as the material of active absorption and the depth of the cavity behind the perforated plate is changed according to the resonant frequency of the perforated plate. The rigid wall is moved to produce resonance so that the absorption coefficient can reach the maximal level. It is shown from the numerical calculation that when the perforated plate resonates, the moving distance is large at low frequencies, and the absorption coefficient is low under certain conditions. Perforated plate resonance is effective for single frequency of incident sound wave, which is difficult for the wide frequency, so active absorption based on airflow is posed, and the numerical calculation and experiment are carried out. The results denote that this method of active absorption is practical.