Challenging the elucidation of the vibration suppression mechanism of cast iron powder and its application to different vibration phenomena

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04258
• 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: Oita University
• Principal Investigator: NAKAE TAKASHI 大分大学, 理工学部, 准教授 (80579730)
• Co-Investigator(Kenkyū-buntansha): 劉 孝宏 大分大学, 理工学部, 教授 (60230877)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 粒状体 / 衝突ダンパー / オーディオ / 強制振動 / 自励振動 / 制振

Outline of Final Research Achievements

The particle damper is a damper that uses the kinetic energy of particles and consumes the energy by collision or friction energy between a vibrating body and particles. Currently, The cast iron powder treated in this study has a particle size much smaller than the particle dampers used so far, and is used as a damping material for high grade audio racks, but its damping mechanism is unsolved. In this study, the mechanism of vibration suppressive effect and vibration characteristics of cast iron powder are clarified by fundamental experiment. In order to apply the vibration damping effect of cast iron powder to actual vibration phenomena, the self-excited vibration phenomenon such as disc brake squeal, Hot Judder phenomenon, and the vibration damping of audio rack which is a forced vibration system are treated.

Free Research Field

機械力学

Academic Significance and Societal Importance of the Research Achievements

鋳鉄粉はこれまでの粒状ダンパよりも粒径が非常に小さく，制振効果の優位性が確認されているが，粒径が小さい粒状ダンパの振動特性，制振メカニズムは未解決であり，さらに自励振動を制振する技術は未確立であった。
このような異なる振動現象への制振効果を確認したことにより，汎用性が高い制振材として利用でき，独創的な製品開発が可能となる。また，鋳鉄粉はシンプルかつ安価で，一般的な粘性減衰やアクティブダンパと異なり，老朽化せず，メンテナンス不要で，温度に依存しない等の利点以外にも，廃材の有効利用の観点からも，インパクトのある社会還元性と環境の持続性を両立する制振材として利用可能である．