MEDVIC 연구실

The metal mesh damper features a structure made of stacked metal wires, utilizing the Coulomb friction between the wires to achieve damping characteristics. Compared to the elastic structures used in conventional foil bearings, it can provide a superior damping coefficient at a lower cost.

Fig. 1 Metal Mesh Damper

 

 Ball bearings have the disadvantage that the rolling elements, which are in point contact with the outer race, must handle dynamic loads caused by vibration in rotating machinery. In particular, ball bearings lack a damping system, so they cannot dissipate the vibrations caused by centrifugal forces during high-speed operation, which may lead to damage of both the shaft and the bearing. To address these issues, research is being conducted on installing squeeze film dampers or metal mesh dampers on the outer race of ball bearings to absorb the vibrations and protect the bearing. Notablty, metal mesh dampers have a simple structure, do not require a separate oil supply system, and are relatively insensitive to temperature changes, making them advantageous.

Fig. 2 schematic view and model of metal mesh damper-ball bearing assembly

Fig. 3 Experimental rotor displacement and acceleration versus rotor speed without MMD and with MMD

-서정화, 김태호. (2019). 볼 베어링 및 가스 포일 베어링으로 지지되는 소형 고속전동기의 진동 특성. Tribology and Lubricants, 35(2), 114-122.

-서정화, 석윤지, 김태호. (2017-10-20). 메탈메쉬댐퍼를 갖는 고속모터의 볼베어링 예압에 따른 회전축 진동 특성. 한국트라이볼로지학회 학술대회, 서울.

The metal mesh damper has low and nonlinear stiffness, so high linear stiffness is desired to be added through an elastic ring(wire wave ring) to the metal mesh damper. The wire wave ring serves as a conponent for supporting the bearing. By using the wire wave ring,  high and linear stiffness can be provided, and the stiffness can be adjusted by changing design variables to control the additional stiffness.

                                                                         

Fig. 4 wire wave ring

                                                                                                                                     Fig. 5 model of metal mesh-wire wave ring damper assembly

Fig. 6 Experimental stiffness versus displacement without WWR and WWR

-권용범, 조강석, 김태호. (2024-10-24). 와이어 웨이브 병렬 메탈메쉬댐퍼의 링으로 동특성 지지되는 규명. 한국소음진동공학회 학술대회 논문집, 정선.