Generation of an essentially global zone of quiet

2017 Fiscal Year Final Research Report

• Project/Area Number: 25249022
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Dynamics/Control
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Tanaka Nobuo 首都大学東京, システムデザイン研究科, 名誉教授 (70305423)
• Co-Investigator(Kenkyū-buntansha): 福田 良司 地方独立行政法人東京都立産業技術研究センター, 開発本部開発第一部機械技術グループ, 主任研究員 (60463030) ; 岩本 宏之 成蹊大学, 理工学部, 准教授 (90404938)
• Research Collaborator: SANADA Akira
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: 絶対静粛空間 / 強連成場 / エバネセント波 / 固有値問題 / 反共振現象

Outline of Final Research Achievements

With a view to establishing a control strategy for generating an essentially global zone of quiet, evanescent waves which do not propagate in the air play a significant role in the present research. As the preceding research clarified the existence of the evanescent modes in a strongly coupled cavity, the fundamental properties of the generation mechanism are further investigated. The evanescent waves are also found even in a structural vibration of a finite panel in the open space, so that the point source array is then employed to emulate the vibration patterns that produce the evanescent waves. As with a real residential circumstances, the zone of quiet is experimentally achieved using both vibration and sound control.

Free Research Field

静粛性工学