Abstract
Magnetorheological (MR) dampers, used as intelligent semi-active vibration control devices to achieve low energy consumption, fast response, controllability, and other capabilities are generally installed with a variety of sensors on their exterior to ensure that the damping force can be accurately controlled. However, external sensors are often affected by external complications that reduce the reliability of the damper, and the cost of powering the damper coils in remote locations where power is not available can be significantly increased. Based on these problems, a new self-powered MR damper scheme is proposed. The proposed MR damper has both energy-harvesting capabilities and damping controllability, and greatly improves the stability and application range of the device by converting vibration energy into electrical energy to supply the excitation coil. The MR damper can drive the piston rod in a linear reciprocating motion by external excitation, which converts mechanical energy into electrical energy via a DC brushless three-phase generator after conversion by a double-linkage mechanism. At the same time, the electrical energy generated by the generator is passed into the excitation coil to change the output damping force of the damper. Meanwhile, the damping performance and energy-harvesting efficiency of the new self-powered MR damper is experimentally tested. Experimental results show the damping force of the device reaches 1040 N when the applied current is 0.6 A. The proposed self-powered MR damper has an instantaneous voltage amplitude of 1.782 V and a peak phase power of 4.428 W when the input excitation amplitude is 12.5 mm and the frequency is 3 Hz.
Highlights
Since the 1980s, various types of damper have been used on a large scale for suspension systems for buildings, cable-stayed bridges, automobiles, and railroad vehicles [1].Through decades of development, there are three main types of dampers, namely, hydraulic dampers [2,3,4], electromagnetic dampers [5,6,7], and MR dampers [8,9,10]
The magnetorheological effect of the magnetorheological fluid inside MR dampers occurs according to the action of a magnetic field, i.e., their rheological properties vary according to the strength of the external magnetic field and are highly controllable [11]
The helical gear electromagnetic damper designed by Waleed et al [17] uses a helical gear helical drive, rectifies the current with a motion rectification mechanism composed of a one-way clutch, and drives the motor to rotate around in one direction; the results showed that its average energy recovery efficiency is 40%
Summary
Since the 1980s, various types of damper have been used on a large scale for suspension systems for buildings, cable-stayed bridges, automobiles, and railroad vehicles [1]. Based on the rapid development of new intelligent materials, magnetorheological fluid, as a new intelligent material, has the advantages of continuously controllable damping force, short response time, simple structure, low energy consumption, and wide adjustable range. Developed an MR damper with a double outlet rod for self-power supply This selfcollecting structure uses the combination of a ball screw sub and a rotating generator to convert vibration energy into electrical energy, to power the excitation coil through its mechanical structure. MR dampers, the existing vibration energy-harvesting techniques for MR dampers still face problems such as low output power, complex structures, and high cost To solve these problems, an efficient self-powered MR damper is proposed in this paper, which combines a double-linkage mechanical conventional mechanism with a conventional linear double-output rod MR damper. This new self-powered MR damper based on a double-linkage mechanism has high energy conversion efficiency in addition to its simple structure and low manufacturing cost
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