Vibration Suppression and Energy Harvesting with a Non-traditional Vibration Absorber: Transient Responses

Abstract

This paper focuses on vibration suppression and energy harvesting using a non-traditional vibration absorber referred to as model B. Unlike the traditional vibration absorber, model B has its damper connected between the absorber mass and ground. The apparatus used in the study consists of a cantilever beam attached by a mass at its free end and an electromagnetic energy harvester. The frequency tuning is achieved by varying the beam length while the damping tuning is realized by varying the harvester load resistance. The question addressed is how to achieve the best performance under transient responses. The optimum tuning condition for vibration suppression is based on the Stability Maximization Criterion (SMC). The performance of energy harvesting is measured by the percentage of the harvested energy to the input energy. A computer simulation is conducted. The results validate the optimum parameters derived by the SMC. There is a trade-off between vibration suppression and energy harvesting within the realistic ranges of the frequency tuning ratio and damping ratio. A multi-objective optimization is conducted. The results provide a guideline for obtaining a balanced performance. An experimental study is carried out. The results verify the main findings from the computer simulation. This study shows that the developed apparatus is capable of achieving simultaneous vibration suppression and energy harvesting under transient responses.

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

“…where i is the current of the circuit. The inductance of the coils is neglected for simplicity [32]. With this condition, the current is related to the absorber mass's velocity relative to the base, i.e.,…”

“…The relative displacement transmissibility ratio was chosen to be the objective function for optimum VS, while the ratio of the harvested power amplitude to the input power amplitude was chosen to be the objective function for optimum EH. The same device was used in a primary system under initial disturbance [32]. The SMC was employed as the objective function for optimum VS, while the ratio of the harvested energy over the input energy was used as the objective function for optimum EH.…”

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

“…Recently, many methods have been used to obtain the vibration characteristics of structures, such as obtaining the eigenmodes of structures or resonance points using direct numerical integration [12][13][14][15][16][17][18][19][20][21]. However, it is very difficult to obtain the mode in the case of the forced vibration response when the object undergoes real vibrations such as vibrations during the operation of the machine or control output.…”