Self moving fluidic actuator using acoustic radiation force

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02092
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Kurosawa Minoru 東京工業大学, 工学院, 准教授 (70170090)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: アクチュエータ / 超音波 / 圧電 / ロボット / 流体力学 / 固体振動

Outline of Final Research Achievements

The propulsive force of the liquid actuator has a propulsive force characteristic that is the square of the drive voltage, and it was confirmed that the propulsive force increases with the square of the sound pressure. It was theoretically confirmed that the thrust generation mechanism is based on acoustic radiation force.
The thrust force of the actuator using the surface acoustic wave device was compared for devices with drive frequencies of 9.61 MHz, 19.22 MHz, 29.14 MHz, 38.45 MHz, and 96.13 MHz, and it was found that almost the same thrust force was obtained even if the drive frequencies were different. The higher frequencies resulted in larger thrust per unit area due to the smaller size of the device, and it was found that a decrease in thrust due to the higher frequencies could be avoided.

Free Research Field

超音波工学

Academic Significance and Societal Importance of the Research Achievements

固体内での振動が流体中へ放射する際に，固体振動面に作用する音響放射圧の存在は，これまで注目されたことが無く，物理現象として深く研究された事や，アクチュエータへの利用を研究されたことは無かった。本研究課題では，固体である超音波振動源から流体中に超音波が放射する際に発生する音響放射圧について，物理現象を定量的に解析するとともに，アクチュエータとして利用することを研究する，初めての試みである。