Design of electromagnetic shock absorbers

Gupta, Abhijit; Jendrzejczyk, J.A.; Mulcahy, T. M.; Hull, J.R.

doi:10.1007/s10999-007-9031-5

Cited by 117 publications

(61 citation statements)

References 5 publications

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“…When the rotary motor is used, the [18,19]. The linear generator can directly harvest the vibration energy [20][21][22], but, with a given space, the rotary one can generate more power [23]. For their promising prospect, the study of regeneration suspensions should be combined with the energy harvesting and vibration control [24].…”

Section: Introductionmentioning

confidence: 99%

An Energy Saving Variable Damping Seat Suspension System With Regeneration Capability

Ning

Sun

et al. 2018

IEEE Trans. Ind. Electron.

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In this paper, an energy saving variable damping seat suspension system is designed, manufactured and validated. A controllable electromagnetic damper (EMD), which consists of a permanent magnet synchronous motor (PMSM), a 3-phase rectifier, a metal-oxide-semiconductor field-effect transistor (MOSFET) switch module, an external resistor, a diode, and a capacitor, is designed and tested firstly. The EMD is integrated with a planetary gearbox to amplify its torque output, and both of them are installed on the centre of the scissors structure of a seat suspension. The EMD's damping property can be controlled by exerting pulse width modulation (PWM) signal with different duty cycles on the MOSFET switch module. By analysing the EMD test results and the seat suspension's kinematic, the controllable damping of the EMD is derived from 115.68 Ns/m to 669.74 Ns/m. A control method for vibration isolation is proposed considering that the generated damping force is reverse to the suspension's relative velocity, and its value is related to both the damping coefficient and the relative velocity, thus the desired control force can be partially achieved by the variable damper. The proposed variable damping seat suspension and its controller are validated on a 6-degree of freedom (6-DOF) vibration platform in both frequency domain and time domain. The test results show that the controlled variable damping seat suspension has better performance in vibration isolation than the proposed seat with highest and lowest damping, and the conventional passive one. In the meantime, the RMS value of the system harvestable power is 1.492 W, and the power consumption of the PWM control signal is very few. Therefore, this variable damping seat suspension can improve the ride comfort with ignorable energy cost.

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Section: Introductionmentioning

confidence: 99%

An Energy Saving Variable Damping Seat Suspension System With Regeneration Capability

Ning

Sun

et al. 2018

IEEE Trans. Ind. Electron.

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“…Studies of power potential in regenerative vehicle suspension have reported a range of harvestable energy values between 46W and 7500 W using different techniques [8]- [10], [12]- [15]. In a different study, Kawamoto et al [17] reported a model in which 15.3W energy was recovered from one of the shock absorbers of a vehicle at 50 mph on the C class road with a vibration above 2 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…For the last 25 years, shock absorbers have been a considerable issue in energy-regenerative systems. The different techniques were applied to the road disturbances to generate electricity [12]- [14]. As for vehicles, it is mentioned that around 10-16% of the fuel energy is employed to overcome the resistances such as air drag, road friction and vibrations [15].…”

Section: Introductionmentioning

confidence: 99%

Design of the Hybrid Regenerative Shock Absorber and Energy Harvesting from Linear Movement

Demetgül¹,

Guney²

2017

JOCET

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Abstract-Shock absorbers or dampers are used to maintain the contact between the vehicle's tires and road surface, to absorb the vibrations generated from the road disturbances and recently they are used in energy harvesting. In this study, a hybrid regenerative shock absorber system containing hydraulic and electromagnetic (EM) damper mechanisms was designed to generate electricity. The energy harvesting was applied from the hybrid regenerative shock absorber using excited linear movement. A total of 0.25W for 0.004 m/s, 0.4W for 0.0045 m/s and 0.66W for 0.005 m/s was harvested using 80Ω and 2Ω external resistors for hydraulic part and for EM part, respectively, at 15 mm amplitude in response to the specified excitation. The mean power for 0.005 m/s was calculated as 0.003W for coil and as 0.56W for generator. The harvested energy was measured as low for measured velocities, however, the amount of harvestable energy rate or efficiency has increased with increasing velocity.Index Terms-Electromagnetic damper, energy harvesting, shock absorber, hydraulic damper, regenerative damper.

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“…However, due to the limitation of geometry and limited permissible deformation of electrostatic and piezoelectric transducers, the electromagnetic induction method is the more appropriate choice for large scale applications [9]. Movement of a backpack carried by a human during walking [10], all-terrain-vehicle vibration [11], vertical movement of a sailing boat [12] are some examples of relatively large scale vibration resource. However, in addition to the configuration of energy conversion device, maximizing the output power and efficiency are the main concerns in the process of design and optimization of vibration energy harvesters.…”

Section: Introductionmentioning

confidence: 99%

Output power and efficiency of electromagnetic energy harvesting systems with constrained range of motion

Hendijanizadeh¹,

Sharkh²,

Elliott³

et al. 2013

Smart Mater. Struct.

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Abstract. In some energy harvesting systems, the maximum displacement of the seismic mass is limited due to the physical constraints of the device. This is especially the case where energy is harvested from a vibration source with large oscillation amplitude (e.g., marine environment). For the design of inertial systems, the maximum permissible displacement of the mass is a limiting condition. In this paper the maximum output power and the corresponding efficiency of linear and rotational electromagnetic energy harvesting systems with a constrained range of motion are investigated. A unified form of output power and efficiency is presented to compare the performance of constrained linear and rotational systems. It is found that rotational energy harvesting systems have a greater capability in transferring energy to the load resistance than linear directly coupled systems, due to the presence of an extra design variable viz. the ball screw lead. Also, in this paper it is shown that for a defined environmental condition and a given proof mass with constrained throw, the amount of power delivered to the electrical load by a rotational system can be higher than the amount delivered by a linear system. The criterion that guarantees this favorable design has been obtained.

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Design of electromagnetic shock absorbers

Cited by 117 publications

References 5 publications

An Energy Saving Variable Damping Seat Suspension System With Regeneration Capability

An Energy Saving Variable Damping Seat Suspension System With Regeneration Capability

Design of the Hybrid Regenerative Shock Absorber and Energy Harvesting from Linear Movement

Output power and efficiency of electromagnetic energy harvesting systems with constrained range of motion

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