Damping Performance of Tuned Particle Impact Damper For Horizontal Vibrations

Date of Award

5-1-2023

Document Type

Thesis

Degree Name

Master of Science in Physics

First Advisor

Joel T. Maquiling, PhD

Abstract

Particle Impact Damping (PID), a method of vibration reduction by enclosing particles, such as steel balls, in a container attached to a vibrating structure, helps avoid the damaging effects of these excitations on systems used in several industrial and engineering applications. This study investigates the damping performance of a Tuned Particle Impact Damper (TPID) with a rhombus-shaped base of varying vertex angles πœƒ and rhombus base height (𝑅𝐡𝐻) for a cantilever beam undergoing horizontal, transient vibration. Damping Ratio 𝜁 has been measured using the acceleration-time response, fitted exponential decay envelope, and the frequency response functions for different numbers of particles 𝑁. Results show that the damping ratio follows an inverted parabola trend as 𝑁 increases. For the decreasing 𝑅𝐡𝐻 (4,3.5,3,2.5, and 2π‘π‘š), the greatest damping ratios 𝜁 have been obtained at the optimal numbers 𝑁=32,28,24,20, and 16, respectively. The optimal fill ratio 𝐹 is 26.18% regardless of the 𝑅𝐡𝐻 and πœƒ. The results show that adjusting the TPID's πœƒ and 𝑅𝐡𝐻 changes the TPID's damping performance. It has been demonstrated that the design of TPID with a rhombus-shaped base can be used for applications requiring varying damping parameters.

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