An Energy Saving Variable Damping Seat Suspension System With Regeneration Capability

Abstract

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.

Frequency-Based Control Strategy for Compact Electromagnetic Tuned Mass Damper

“…us, an electrical circuit with an adjustable resistor is needed to achieve semiactively regulation of the damping force for such a device. As seen in Figure 3, Ning et al [24] suggested an approach based on the metal-oxide semiconductor field-effect transistor (MOSFET).…”

Transient Voltage Control of Sending-End Wind Farm Using a Synchronous Condenser Under Commutation Failure of HVDC Transmission System

“…It is difficult to reconstruct some projects which have been put into use. Literature [5][6][7][8] proposed the strategy of removing the AC filter of the DC sending-end bus during the fault and putting in a static, dynamic reactive power compensation device for reactive power compensation but did not consider the response time of the device and the impact of the moment of the fault on the wind farm. At present, the main dynamic reactive power compensation devices in the power grid are SVC, static var generator (SVG), and synchronous condenser.…”

A Systematic Literature Review of Various Control Techniques for Active Seat Suspension Systems

“…In the recent studies, various approaches were proposed to improve the ride comfort and avert the fatigue risks associated to the human body. Some researchers have improved the vehicle suspension system to reduce the input vibration into the human body [10][11][12], while others focus on enhancing the vehicle seat suspension design [13]. Similarly, few studies integrated both the vehicle suspension system and seat suspension system to isolate vibration transmitted to human body [14,15].…”