An electromagnetic inerter-based vibration suppression device

Abstract

This paper describes how an inerter-based device for structural vibration suppression can be realized using an electromagnetic transducer such as a linear motor. When the motor shaft moves, a difference of voltage is generated across the transducer coil. The voltage difference is proportional to the relative velocity between its two terminals. The electromagnetic transducer will exert a force proportional to current following the Lorentz principle if the circuit is closed around the transducer coil. If an electronic circuit consisting of a capacitor, an inductance and a resistance with the appropriate configuration is connected, the resulting force reflected back into the mechanical domain is equivalent to that achieved by a mechanical inerter-based device. The proposed configuration is easy to implement and very versatile, provided a high quality conversion system with negligible losses. With the use of electromagnetic devices, a new generation of vibration absorbers can be realized, for example in the electrical domain it would be relatively uncomplicated to synthesize multi-frequency or real time tunable vibration absorbers by adding electrical components in parallel. In addition by using resistance emulators in the electrical circuits, part of the absorbed vibration energy can be converted into usable power. Here an electromagnetic tuned inerter damper (E-TID) is tested experimentally using real time dynamic substructuring. A voltage compensation unit was developed in order to compensate for coil losses. This voltage compensation unit requires power, which is acquired through harvesting from the vibration energy using a resistance emulator. A power balance analysis was developed in order to ensure the device can be self sufficient. Promising experimental results, using this approach, have been obtained and are presented in this paper. The ultimate goal of this research is the development of autonomous electromagnetic vibration absorbers, able to harvest energy, convert it into usable power, and use it for vibration control and health monitoring.

Displacement reduction effect and simplified evaluation method for SDOF systems using a clutching inerter damper

“…Compared with the performance of the TMD, the RIDTMD provides not only lower peak structural responses but also a wider suppression band with no increase in block strokes. In contrast, based on the force‐current electric‐mechanical analogy, Gonzalezbuelga et al proposed a device called an electromagnetic TID, which consists of a linear motor and an electric resonant circuit. The proposed electromagnetic TID is the equivalent system of the TID in electrical systems .…”

“…In contrast, based on the force‐current electric‐mechanical analogy, Gonzalezbuelga et al proposed a device called an electromagnetic TID, which consists of a linear motor and an electric resonant circuit. The proposed electromagnetic TID is the equivalent system of the TID in electrical systems . In addition to the fixed‐inerter‐based TMD mentioned above, Mohammadi‐Ghazi et al proposed an adaptive‐configuration TMD consisting of fixed and moving parts.…”

An inerter-based active vibration isolation system

“…An appealing property of inerters is that they can be designed and realized in practice having their inertance significantly larger than their mass [1,2]. This opens many interesting possibilities so that many authors reported on how to design and use inerters to suppress mechanical vibrations [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

“…Alternatively, an electromagnetic transducer (voice coil, linear motor) can be shunted with electrical impedance. If the total shunt impedance is properly tuned, then the whole electromechanical network theoretically behaves exactly as if it incorporated an ideal inerter mounted in series with a parallel spring damper-pair [3]. In this context, self-powered configurations employing a simultaneous active control and energy harvesting have been considered to synthesize mechatronic inerters [3].…”

“…If the total shunt impedance is properly tuned, then the whole electromechanical network theoretically behaves exactly as if it incorporated an ideal inerter mounted in series with a parallel spring damper-pair [3]. In this context, self-powered configurations employing a simultaneous active control and energy harvesting have been considered to synthesize mechatronic inerters [3]. Another type of mechatronic inerter utilizes a rotary DC motor shunted with an appropriate electrical circuit [4].…”