Optimization of a Non-Traditional Vibration Absorber for Vibration Suppression and Energy Harvesting

Abstract

This paper investigates the optimization of a non-traditional vibration absorber for simultaneous vibration suppression and energy harvesting. Unlike a traditional vibration absorber, the non-traditional vibration absorber has its damper connected between the absorber mass and the base. An electromagnetic energy harvester is used as a tunable absorber damper. This non-traditional vibration absorber is attached to a primary system that is subjected to random base excitation. An analytical study is conducted by assuming that the base excitation is white noise. In terms of vibration suppression, the objective of the optimization is to minimize the power dissipated by the primary damper and maximize the power dissipated by the absorber damper. It is found that when the primary system is undamped, the power dissipated by the absorber damper remains a constant that is related to the mass ratio. The higher the mass ratio, the higher the power dissipated. When the primary system is damped, the minimization of the power dissipated by the primary damping is equivalent to the maximization of the power dissipated by the absorber damper. The existence of the optimum solutions depends on both the mass ratio and the primary damping ratio. In terms of energy harvesting, the objective of optimization is to maximize the power harvested by the load resistor. It is found that for a given mass ratio and primary damping ratio, the optimum frequency tuning ratio required to maximize vibration suppression is slightly higher than that required to maximize the harvested power. The trade-off issue between vibration suppression and energy harvesting is investigated. An apparatus is developed to allow frequency tuning and damping tuning. Both the numerical simulation and experimental study with band-limited white noise validate the general trends revealed in the analytical study.

Basic Study on Mechanical Vibration Suppression System Using 2-Degree-of-Freedom Vibration Analysis

“…The characteristics of the forced vibration response in the 2-DOF system obt the previous section (Equation (8)) can be changed by varying the mass ratio, 𝜇 the mass ratio, 𝜇, was changed from 0 to 0.2 under the conditions 𝛼 = 0.05, 𝜀 and 𝜀 = 0.17, the transmissibility TM changes, as shown in Figure 3. When 𝜇 number of resonance points in the transmissibility TM was 1.…”

“…Vibration analysis by material properties used for vibration isolation has been performed [1][2][3][4][5][6]. Furthermore, various dynamic vibration absorbers, such as damper-based dynamic absorbers and active dynamic absorbers, have been studied [7][8][9]. These considerations improve not only safety but also durability and marketable quality.…”

A Hydro-Mechanic Vibration Absorber With Adjustable Operating Frequency

“…The most relevant methodology often used as a reference is presented in [7]. Other publications from recent years dealing with design optimization can be found, for instance, in [8,9,10], where in the latter also energy harvesting with a vibration absorber is discussed. In fact, the natural frequency of the primary system can be identified accurately by more or less laborious measurements, however, the perfect tuning can often only achieved by an absorber with variable frequency.…”

Application of Pebbles for Geotechnical Seismic Isolation (GSI): Experimental Parametric Study

“…The main difference from conventional seismic isolation is that the isolation layer is located below the foundation level, as originally proposed by Tsang [2]. The purpose of such seismic isolation would be served, although it would provide a lower level of seismic force reduction compared to more complex and expensive devices [3][4][5][6][7][8][9][10][11][12][13][14]. It is desirable to use materials that are readily found in nature and have large reserves.…”