Design of mechanical metamaterials for simultaneous vibration isolation and energy harvesting

2017 ◽  
Vol 111 (25) ◽  
pp. 251903 ◽  
Author(s):  
Ying Li ◽  
Evan Baker ◽  
Timothy Reissman ◽  
Cheng Sun ◽  
Wing Kam Liu
Keyword(s):  
Energy Harvesting ◽  
Vibration Isolation ◽  
Mechanical Metamaterials

scholarly journals Analysis and optimal design of a vibration isolation system combined with electromagnetic energy harvester

2019 ◽  
Vol 30 (16) ◽  
pp. 2382-2395
Author(s):  
Uchenna Diala ◽  
SM Mahdi Mofidian ◽  
Zi-Qiang Lang ◽  
Hamzeh Bardaweel
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Vibration Isolation ◽  
Energy Conversion Efficiency ◽  
Isolation System ◽  
Magnetic Components ◽  
Energy Harvesting System ◽  
Response Function Method ◽  
Conversion Efficiencies

This work investigates a vibration isolation energy harvesting system and studies its design to achieve an optimal performance. The system uses a combination of elastic and magnetic components to facilitate its dual functionality. A prototype of the vibration isolation energy harvesting device is fabricated and examined experimentally. A mathematical model is developed using first principle and analyzed using the output frequency response function method. Results from model analysis show an excellent agreement with experiment. Since any vibration isolation energy harvesting system is required to perform two functions simultaneously, optimization of the system is carried out to maximize energy conversion efficiency without jeopardizing the system’s vibration isolation performance. To the knowledge of the authors, this work is the first effort to tackle the issue of simultaneous vibration isolation energy harvesting using an analytical approach. Explicit analytical relationships describing the vibration isolation energy harvesting system transmissibility and energy conversion efficiency are developed. Results exhibit a maximum attainable energy conversion efficiency in the order of 1%. Results suggest that for low acceleration levels, lower damping values are favorable and yield higher conversion efficiencies and improved vibration isolation characteristics. At higher acceleration, there is a trade-off where lower damping values worsen vibration isolation but yield higher conversion efficiencies.

Vibration Energy Harvesting of a Hydraulic Engine Mount Using a Turbine

2010 ◽  
Author(s):  
Omid Mohareri ◽  
Siamak Arzanpour
Keyword(s):  
Energy Harvesting ◽  
Vibration Isolation ◽  
Vibration Suppression ◽  
Low Cost ◽  
Dissipated Energy ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Engine Mounts ◽  
Harvesting Technique ◽  
Engine Mount

The hydraulic engine mount (HEM) has been designed to provide a vibration isolation characteristic to control road and engine induced vibrations in vehicles by using two fluid passages known as decoupler and inertia track. These types of engine mounts are known for their best noise, vibration, and harshness (NVH) suppression performance among other different types of engine mounts. However, a low cost technique to recycle the dissipated energy of the system in the process of vibration suppression is significantly advantageous. A novel design structure in which the decoupler is replaced with a water turbine to capture and restore the vibration energy of the system is presented in this paper. The turbine design and selection has been done based on the upper and lower chamber pressures and the fluid flow rates in the system’s resonant frequency. The mount vibration isolation and energy generation performance is studied in both frequency and time domains. The simulation results demonstrate that a considerable amount of energy can be harvested from the engine vibration sources. This recent study demonstrates a novel energy harvesting technique in vehicles that require minimum design modifications of conventional hydraulic mounts.

Energy harvesting using an array of multifunctional resonators

2012 ◽  
Vol 24 (2) ◽  
pp. 168-179 ◽  
Author(s):  
Kota Mikoshiba ◽  
James M Manimala ◽  
CT Sun
Keyword(s):  
Energy Harvesting ◽  
Kinetic Energy ◽  
Resonance Frequency ◽  
Band Gap ◽  
Vibration Isolation ◽  
Microelectromechanical Systems ◽  
Stop Band ◽  
Unit Cell ◽  
External Work ◽  
Local Resonance

Energy harvesting from structural vibrations using an array of multifunctional resonators based on the theory of locally resonant materials is demonstrated. Such locally resonant structures exhibit a stop band for elastic wave propagation. The band gap frequency range depends on the local resonance frequency of the microstructure. One method to realize this is through the use of an array of embedded resonators where the external work done is stored as kinetic energy of the internal mass when the forcing frequency is close to the local resonance frequency. This mechanism can be used to harvest energy by converting the kinetic energy into electrical energy, thus bestowing a multifunctional utility to the structure. We use a spring-loaded magnet enclosed in a capped poly(methyl methacrylate) tube equipped with copper coils to create a unit cell that acts both as a resonator and as a linear generator. Experiments on a serial array of seven unit cells exhibit a band gap between 146.5 (local resonance frequency) and 171 Hz with a peak voltage generation of 3.03 V at steady state. The continuous effective power generated by a single unit cell across a 1-Ω load resistor is 36 mW, indicating the feasibility of constructing vibration isolation structures that can power simple electronic and microelectromechanical systems devices. The applicability of using the device as a transducer to measure the local resonance frequency and the global resonance frequency of the structure is also discussed.

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