An assembled arc-shaped pendulum TMD with constant eddy current damping for structural vibration control

Shuli Wei , Jian Wang , Jinping Ou

Abstract

Pendulum tuned mass damper with eddy current damping (EC-PTMD) is a promising TMD device for vibration control of structures. Previous study focused primarily on the plate-like configuration of EC-PTMD, which motion of inertial mass is approximately horizontal. However, uneven distribution of damping force, non-constant damping and low energy efficiency will be resulted. This study developed a newly assembled pendulum tuned mass damper with constant eddy current damping (AEC-PTMD) in the form of arc. The proposed AEC-PTMD consists of a rigid suspension with sufficient lateral stiffness to keep inertial mass motion in a plane, the conductor plate fixed on the baseplate, and arc-shaped back iron acted as inertial mass placed on two sides of conductor plate. Meanwhile, the arc-shaped permanent magnets (PMs) are embedded into both sides of back iron to overcome the normal attraction and enhance greater magnetic density. Based on the Biot-Savart Law, the analytical expressions of magnetic flux distribution for arc-shaped PM are derived and assessed. Meanwhile, the effect of ferromagnetic media on magnetic flux distribution of arc-shaped PM is analyzed, which utilized a parameterization formula for the distance from the surface of the PM to a point outside. Further, the 3D finite element model (FEM) of an AEC-PTMD unit is established to evaluate the accuracy of the analytical results. A prototype of the proposed AEC-PTMD unit has been fabricated and laboratory experiments are conducted for the purpose of validating analytical and FEM results. All of these results have a good agreement.

Key Words

arc-shaped permanent magnet; eddy current damping; pendulum tuned mass damper

Address

(1) Shuli Wei, Jinping Ou — School of Civil and Environment Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
(2) Shuli Wei, Jinping Ou — Shenzhen Key Laboratory of Intelligent Structure System in Civil Engineering, Shenzhen 518055, China
(3) Jian Wang, Jinping Ou — Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China.

PDF Viewer

Preview is limited to the first 3 pages. Sign in to access the full PDF.

← Back to Volume 34, No. 3