Development and application of object-softening equipment by applying ultrasonic vibrations

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04285
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 20010:Mechanics and mechatronics-related
• Research Institution: Tokuyama College of Technology
• Principal Investigator: Suzuki Atsuyuki 徳山工業高等専門学校, 機械電気工学科, 准教授 (40450142)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 超音波振動 / 衝撃吸収 / 高張力鋼板 / Blaha効果 / 樹脂

Outline of Final Research Achievements

We have developed impact absorption devices and other devices as object softening devices by applying ultrasonic vibrations. Using a 40 mm diameter ultrasonic transducer, the deformation and shock mitigation properties of high tensile steel plate and several types of resin were investigated when ultrasonic vibrations were applied, and it was confirmed that ultrasonic vibrations reduced deformation resistance and impact force. For example, when polyacetal was used as a sample, the application of ultrasonic vibrations reduced the impact force by approximately 10.5%. In addition, although it depended on the experimental conditions, the head injury value was slightly reduced when the dummy head collided with a structure that imitated a hood holding mechanism of a car while ultrasonic vibrations were applied. A system was also constructed to measure the amount of deformation at the moment the impact force was applied.

Free Research Field

超音波工学

Academic Significance and Societal Importance of the Research Achievements

自動車が歩行者をはねる事故などでは十分に衝撃を吸収できないケースが多い。そこで、衝撃を受けた瞬間に車両を構成する素材に超音波振動を印加することで変形抵抗を低減させ、衝撃吸収度を向上させる方法を考案した。本研究では、高張力鋼板やさまざまな樹脂を変形試料として効果的に衝撃を吸収できる条件などについて検討した。これらの研究成果により、超音波振動による衝撃吸収装置を自動車などの乗り物や精密機器などへ応用できる可能性を示した。また、ダミーヘッドを用いた頭部損傷値の計測システムや衝撃吸収特性計測システムを構築し、超音波振動を用いた衝撃軽減・吸収装置の特性をより明らかにするための基礎が固まってきた。