Development of a non-piston MR suspension rod for variable mass systems

Abstract

The semi-active suspension systems for variable mass systems require long work stroke and variable damping, while the currently piston structure limits the work stroke for the magnetorheological (MR) dampers. The main work of this paper is to design a semi-active non-piston MR (NPMR) suspension rod for the reduction of the vibration of an automatic impeller washing machine, which is a typical variable mass system. The designed suspension rod locates in the suspension system that links the internal tub to the washing machine cabinet. The NPMR suspension rod includes a MR part and a air part. The MR part can provide low initial damping force and the unlimited work stroke compared with the piston MR damper. The hysteretic response tests and vibration performance evaluation with different loadings are conducted to verify the dynamic performance for the designed rod. The measured damping force of the MR part varies from 5 to 20 N. Studies of dehydration mode experiments of the washing machine indicate that its vibration acceleration with the NPMR suspension rods can reduce to half of the original passive ones in certain conditions.

Dynamic behavior of a magnetorheological fluid radial-flow-based energy absorber considering apparent slip boundary condition

“…In the annular hybrid flow model, the magnetic chain is broken by the piston shear force. In the second model, it is broken by the MRF flow squeeze force (Deng et al, 2018; Imaduddin et al, 2014; Shou, 2019; Yu et al, 2016). Under the same external excitation, the radial squeeze flow model produces the largest response for effectively lengthening the magnetic flow channel and demonstrating extensive application potential (Bai et al, 2013; Dogruer et al, 2008; Hu et al, 2019; Liao et al, 2012).…”

Self-sensing automotive magnetorheological dampers for low frequency vibration

“…Magnetorheological (MR) damper is a semi-active control device which has potential to conquer challenges in automobile dampers [5][6][7][8][9][10][11]. Damping behavior of MR damper is continuous and controllable with the application of current [12][13][14].…”

Development of a variable stiffness magnetorheological damper with self-powered generation capability

“…Deng et al presented an inventive philosophy for energy generators, which was based on nonlinear vibration, and provided a method of poly-stable vibrational power generation [24]. He also developed a semi-active suspension with non-piston MR damper to reduce the vibration of a washing machine, which is a typical variable mass system [25]. Wang The power generation part employed ball-screw mechanism and a rotary DC generator to convert mechanical vibration into electrical power [28].…”

“…Recently, an inventive philosophy for energy generators was developed, which was based on nonlinear vibration, and provided a method of poly-stable vibrational power generation (Deng et al, 2019). Previously, they also presented a semi-active suspension with non-piston MR damper to reduce the vibration of a washing machine, which is a typical variable mass system (Deng et al, 2018). A semi-active MR damper was designed with energy regeneration function, composing of a linear DC generator, a controllable MR damper, a control circuit, and a rack–pinion mechanism, for the application of elevated highways.…”