Analysis of Damping Characteristics of Magnetorheological Damper under Impact Load

Sun, Mingzhu; Li, Xiangdong; Zhou, Zhou; Zhu, Qibin; Liu, Bing; Chen, Xu; Wang, Jiong; Zhang, Guang; Cai, Shibo

doi:10.3390/ma15124161

Cited by 10 publications

(8 citation statements)

References 34 publications

(41 reference statements)

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“…where k R is the temperature coefficient of the coil material, T is the working temperature ( • C) of the coil and R 0 is the equivalent resistance of the coil at 0 • C. As the MRD has an operating temperature range of −40 • C to 120 • C, the results of measuring the coil resistance (blue circles) at different temperatures are shown in Figure 2. After fitting using the least squares method, the relationship between resistance and temperature is obtained as shown in the red line in the figure, and the equation is shown in (2). the rate of change of the coil's resistance at the highest and lowest operating temperatures of the MRD is obtained as 41.7% and −29.6%, respectively.…”

Section: Variation Analysis Of Mrd Coil Parametersmentioning

confidence: 99%

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Research on Current Drive System of Magnetorheological Damper Based on Fuzzy PI Control

Liang

Xia

et al. 2022

Materials

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Magnetorheological dampers (MRD) are increasingly used in smart structural damping systems due to their good damping properties. In practical applications, as a nonlinear device, the parameters of the internal excitation coil of the magnetorheological damper will change during operation under the influence of the temperature and external environment, deteriorating the dynamic performance of the output current of the driver and reducing the damping effect of the system. Therefore, the current driver needs to be optimized for this phenomenon in order to ensure accurate current output. In this paper, a mathematical model of the buck circuit combined with the MRD equivalent circuit is established, and after analyzing the model, the parameters of the PI controller are rectified to lay the foundation for the design of the adaptive law. Then, with the help of the fuzzy control method, a fuzzy PI control strategy for MRD current driver is established, which enables the current driving system to adjust the control parameters adaptively when the MRD parameters change and ensure the accurate driving current output. The experimental results demonstrate that the fuzzy PI control strategy has a stronger robustness in the face of parameter changes of the control object compared with the traditional PI control at a system parameter change rate of 40%.

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Section: Variation Analysis Of Mrd Coil Parametersmentioning

confidence: 99%

“…The MRD is an intelligent controllable device developed based on the magnetorheological properties of magnetorheological materials [1], and its damping force value can be adjusted by the excitation current [2]. It has the advantages of simple structure, fast response [3], low energy consumption, and large dynamic range [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Current Drive System of Magnetorheological Damper Based on Fuzzy PI Control

Liang

Xia

et al. 2022

Materials

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“…Most previously reported MREA applications, including the above-mentioned examples, have focused on vibration mitigation or isolation applications under low piston speeds. However, there are potential problems for accidental collision buffers, such as vehicle collision bumper systems (Archakam and Muthuswamy, 2023; Li et al, 2018; Wang et al, 2021), airplane landing gears (Dong et al, 2022; Powell et al, 2016; Saleh et al, 2018), gun recoil systems (Li et al, 2019; Ouyang et al, 2020; Shen et al, 2023), and other high-speed impact protection (Khazoom et al, 2019; Sun et al, 2022; Yang et al, 2019; Zhu and Zhang, 2022), because MREAs are generally regarded as specific MR dampers for the precise control of impact energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Impact behavior of a novel magnetorheological energy absorber based on wedge-shaped squeeze flow model

Li,

Fu,

Liao

2024

Journal of Intelligent Material Systems and Structures

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Magnetorheological (MR) energy absorbers (MREAs) have been extensively investigated as a means of dissipating impact energy and decreasing injury as well as used in a wide range of applications. When applied as an accidental collision buffer, however, problems can arise owing to the inertia of the sudden impact. In this study, a novel MREA with a gradient resistance gap structure working in a wedge-shaped squeeze flow model of a high-viscosity linear polysiloxane-based MR fluid was developed. The MREA has a continuously changing working gap and internal magnetic flux density gradient distribution representing a wedge-shaped structure. A Power-Law model inclusive of fluid minor losses (PLM)- of the damping force of an MREA with a wedge-shaped resistance gap was built to study the impact behavior. A second model also considered the effects of inertia (PLMI). The wedge angle was defined to quantitatively and comprehensively characterize the effects of the wedge-shaped resistance gap because of its significant influence on the dynamic characteristics. Two MREAs with wedge-shaped and equidistant working gaps were fabricated and tested using a drop tower facility with a mass of 600 kg. The experimental results show that the maximum damping force of the MREA with a wedge-shaped resistance working gap reached to as high as 235.8 kN and the dynamic range is increased by 6.5% compared to that with an equidistant working gap. The relative errors of the peak force for impact velocities between 2.8 and 4.2 m s−1 with no applied current were 1.84%–3.67% (PLM) and 0.63%–1.91% (PLMI), and with 3 A applied current were 2.35%–4.99% (PLM), and 1.24%–2.72% (PLMI), demonstrating that the PLMI-based model is capable of accurately predicting the dynamic behavior of the MREA.

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“…When the magnetic field strength is zero, it exhibits liquid-like behaviour, but as the magnetic field strength increases, it transforms into a condensed solid state. This phase change process is constantly controllable, reversible, and possesses a high-frequency response [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Design and feasibility analysis of magnetorheological flexible joint for upper limb rehabilitation

Li,

Yang,

Zhang

et al. 2024

Smart Mater. Struct.

Self Cite

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Traditional upper limb rehabilitation robots can only complete rehabilitation training according a predetermined trajectory, and its safety system is unreliable, the movement status of the affected limb cannot be adjusted or trained according to the expected torque of the human body. This study presents a flexible safety system for the rehabilitation of joints based on magnetorheological (MR) fluid. First of all, the MR dampers inverter has the advantages of large torque, fast response, controllable flexibility, and safety assurance. The range of motion tracks can be adjusted through the four-lever hinge mechanism, and the required driving force is provided by the motor actuator, and MR damper provides flexibility and variable damping characteristics for the output torque. The system adopts the force/position impedance safety control method, under the action of the internal position closed-loop controller, the MR upper limb rehabilitation flexible joint drives the affected limb to track to the safe position and carries out simulation to verify the accuracy of the system motion torque and position. The safe rehabilitation effect of the upper limb rehabilitation system under the three working conditions (Step, Incremental and Equation) of the interaction moment of the affected limb has been extensively studied. The simulation and experiment results show that the MR damper can control the upper limb rehabilitation system to achieve the desired effect under the condition of increasing and changing the interactive force of the patient, and the safety design of the upper limb rehabilitation robot based on MR is verified.

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Analysis of Damping Characteristics of Magnetorheological Damper under Impact Load

Cited by 10 publications

References 34 publications

Research on Current Drive System of Magnetorheological Damper Based on Fuzzy PI Control

Research on Current Drive System of Magnetorheological Damper Based on Fuzzy PI Control

Impact behavior of a novel magnetorheological energy absorber based on wedge-shaped squeeze flow model

Design and feasibility analysis of magnetorheological flexible joint for upper limb rehabilitation

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