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Journal ArticleDOI

Design of bypass rotary vane magnetorheological damper for prosthetic knee application

TL;DR: A bypass rotary vane-type magnetorheological damper suitable for prosthetic knee device is designed and is capable of producing a damping torque of 73 Nm at a design speed of 8.4 rpm and current supply of 1.9 A.
Abstract: Semi-active systems using magnetorheological fluids have been realized in many novel devices such as linear dampers, rotary dampers, brakes, and so on. Rotary vane-type magnetorheological damper is...
Citations
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Journal ArticleDOI
TL;DR: This study analyses the energy consumption of an active magnetorheological knee (AMRK) actuator that was designed for transfemoral prostheses and finds that the system was developed as an operational motor unit with high efficiency.
Abstract: This study analyses the energy consumption of an active magnetorheological knee (AMRK) actuator that was designed for transfemoral prostheses. The system was developed as an operational motor unit ...

18 citations


Cites background from "Design of bypass rotary vane magnet..."

  • ...Email: claysson@gmail.com Herr and Wilkenfeld, 2003; Jonsdottir et al., 2009; Mousavi and Sayyaadi, 2018; Saini et al., 2020; Sayyaadi and Zareh, 2017; Xu et al., 2016)....

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Journal ArticleDOI
TL;DR: In this paper, a comprehensive review of bypass MR dampers is presented, which includes principles of operation, design structures, analytical models, experimental analysis, and applications of MR damping.
Abstract: Magneto-rheological (MR) dampers using MR fluids with controllable rheological properties are mainly utilized in automobiles, structures, electrical transmission lines, medical applications, agricultural engineering, and military equipment. This paper presents a comprehensive review of bypass MR dampers. The principles of operation, design structures, analytical models, experimental analysis, and applications of MR dampers are classified and reviewed. The bypass MR dampers have better MR fluid stability and sedimentation control compared to MR dampers. This is important for maintaining homogeneous magnetic flux distribution throughout the fluid area. The advantageous features of external bypass MR dampers over internal bypass dampers are the higher shear stress, the damping force controllability, and the higher damping force they can generate.

10 citations

Journal ArticleDOI
30 Jul 2021
TL;DR: The developed MR damper has been implemented in a two wheeler vehicle for performance evaluation at on-road testing conditions and showed significant improvement in damper performance with increment of constant current controlling MR dampers.
Abstract: Magnetorheological dampers have been the interest of many researchers for a few decades for the reason of being an effective and rapidly progressing technology in the field of semi-active controlle...

8 citations


Cites methods from "Design of bypass rotary vane magnet..."

  • ...Saini et al.(4) designed a rotary vane MR damper for prosthetic applications considering ASI 1020 steel and analysed the damper parameters to provide effective flux density in the MR fluid flow gap....

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  • ...Saini et al.4 designed a rotary vane MR damper for prosthetic applications considering ASI 1020 steel and analysed the damper parameters to provide effective flux density in the MR fluid flow gap....

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Journal ArticleDOI
TL;DR: In this article , a tiny vane-type magnetorheological brake (TVMRB) was successfully made using the quality function deployment (QFD) method for ankle foot orthosis (AFO) devices.
Abstract: Many studies focus on the torque-to-dimension ratio when designing magnetorheological brakes (MRB), especially for ankle foot orthosis (AFO) devices. Vane MRB is one type of MRB with a limited angle of motion that is naturally suitable to be applied to AFO. However, very few implement quality function deployment (QFD) when making MRB, whereas QFD is an essential factor in making product designs. In this study, a tiny vane-type MR brake (TVMRB) was successfully made using the QFD method. Torque characteristics are determined by analysis of magnetic flux density, theoretically, by 3D simulation, and by using Ansys Maxwell experimentally. For consideration, the analysis was carried out with fluid gap variations (0.5 mm, 0.75 mm, and 1 mm) and current variations (0.5–2 A with 0.5 A increments). As a result, ignoring the leakage of MR fluid (MRF), at a constant rotation of 10 rpm, the smallest torque of 6.14 Nm was obtained at the fluid gap variation of 1 mm and input current of 0.5 A, whereas the largest torque was 46.71 Nm at the fluid gap variation of 0.5 mm and input current of 2 A. Apart from torque, this article will also discuss other brake performances in the form of operational range and power consumption. Finally, the structure of the TVMRB design is compared with other designs presented in the House of Quality (HOQ).

1 citations

References
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Journal ArticleDOI
TL;DR: In this paper, an overview of the essential features and advantages of magnetorheological (MR) materials and devices is given, followed by the derivation of a quasi-static axisymmetric model of MR dampers, which is then compared with both a simple parallel-plate model and experimental results.

719 citations


"Design of bypass rotary vane magnet..." refers methods in this paper

  • ...For flow mode condition, the pressure drop due to viscous and controllable forces can be calculated using equations (8) and (9) (Yang et al., 2002)...

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  • ...For flow mode condition, the pressure drop due to viscous and controllable forces can be calculated using equations (8) and (9) (Yang et al., 2002) DPh = 12hQLt wh3 ð8Þ DPt = 2:07+ 12Qh 12Qh+ 0:4wh2ty tyL h ð9Þ Here, w is the mean circumference of the annular flow path, Q is the flow rate of the…...

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Book
23 Jan 2006
TL;DR: Part 1 Theory Temporal-spatial parameters Measurement of gait kinematics Three-dimensional gait analysis Ground reaction in normal gait Plantar pressure measurement Biomechanics of standing Measuring muscle activity Muscles Gravity and centre of mass Power.
Abstract: Part 1 Theory Temporal-spatial parameters Measurement of gait kinematics Three-dimensional gait analysis Ground reaction in normal gait Plantar pressure measurement Biomechanics of standing Measuring muscle activity Muscles Gravity and centre of mass Power Part 2 Practice Introduction Loading Support and forward progression Propulsion and swing Observational gait analysis Afterword

501 citations


"Design of bypass rotary vane magnet..." refers background in this paper

  • ...Normal human walking seems so effortless and subconscious, but it involves immense underlying complexities (Kirtley, 2006)....

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Journal ArticleDOI
TL;DR: In this article, the geometric optimal design of magnetorheological (MR) valves in order to improve valve performance, such as pressure drop, is presented, where the optimization problem is to find the optimal geometric dimensions of MR valves constrained in a specific volume.
Abstract: This paper presents the geometric optimal design of magnetorheological (MR) valves in order to improve valve performance, such as pressure drop. The optimization problem is to find the optimal geometric dimensions of MR valves constrained in a specific volume. After describing the configuration of MR valves, their pressure drops are investigated on the basis of the Bingham model of an MR fluid. Then, the valve ratio, which is an objective function, is derived by considering the field-dependent (controllable) and viscous (uncontrollable) pressure drops of the MR valves. Subsequently, the optimization procedure using a golden-section algorithm and a local quadratic fitting technique is constructed via a commercial finite element method (FEM) parametric design language. From the constructed optimization tool, optimal solutions of the MR valves, which are constrained in a specific cylindrical volume defined by its radius and height, are calculated and compared with analytical ones. In addition, several different types of MR valves are optimized in the same specific volume and results are presented.

185 citations


"Design of bypass rotary vane magnet..." refers methods in this paper

  • ...The fluid specifications provided by Lord Corporation are curve-fit and the approximate polynomial given by equation (26) is used to evaluate the yield stress in the fluid gap (Nguyen et al., 2007)....

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Journal ArticleDOI
TL;DR: This paper presents a review on design issues and solutions found in active lower limb prostheses based on a systematic literature search with a methodical search strategy.
Abstract: This paper presents a review on design issues and solutions found in active lower limb prostheses. This review is based on a systematic literature search with a methodical search strategy. The search was carried out across four major technical databases and the retrieved records were screened for their relevance. A total of 21 different active prostheses, including 8 above-knee, 9 below-knee and 4 combined knee-ankle prostheses were identified. While an active prosthesis may help to restore the functional performance of an amputee, the requirements regarding the actuation unit as well as for the control system are high and the development becomes a challenging task. Regarding mechanical design and the actuation unit high force/torque delivery, high efficiency, low size and low weight are conflicting goals. The actuation principle and variable impedance actuators are discussed. The control system is paramount for a “natural functioning” of the prosthesis. The control system has to enable locomotion and should react to the amputee’s intent. For this, multi-level control approaches are reviewed.

185 citations


"Design of bypass rotary vane magnet..." refers background in this paper

  • ...Such devices are heavy, have large power demands, and may require tethering too, and the research in this field is limited to prototypes and a few subject trials (Windrich et al., 2016)....

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Journal ArticleDOI
TL;DR: An overview of rotary magnetorheological damper design is presented in this article, in terms of different proposed concepts of structural design, magnetic circuit configuration, and modelling techniques.

162 citations


"Design of bypass rotary vane magnet..." refers background in this paper

  • ...For a more detailed review of rotary MR dampers, the review study by Imaduddin et al. (2013) can be referred....

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  • ...Upon continuous usage for a long duration, the fluid turns into a thick slurry and reaches a non-flowing phase (Imaduddin et al., 2013)....

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