Analysis and Testing of Electrorheological Bypass Dampers

Lindler, Jason E.; Wereley, Norman M.

doi:10.1106/e9j6-6cxr-tue5-pu5w

Cited by 16 publications

(19 citation statements)

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“…Ifδ = 1, the force on the damper shaft, f d , becomes the yield force, F y Lindler and Wereley, 1999). Thus, Equation (11) becomes:τ…”

Section: Mr Damper Scalingmentioning

confidence: 99%

“…where τ y is the dynamic yield stress of the fluid,δ is the nondimensional plug thickness (plug thickness/pole gap), d is the pole gap, A p is the piston head area, and L is the pole length. Ifδ = 1, the force on the damper shaft, f d , becomes the yield force, F y Lindler and Wereley, 1999). Thus, Equation (11) becomes:τ…”

Section: Mr Damper Scalingmentioning

confidence: 99%

“…It is noted that other geometric dimensions and configurations are the same as SD-1000-1. This modified damper was tested using force measurements from sinusoidal displacement cycles recorded on a Roehrig Engineering mechanical damper dynamometer at the University of Maryland (Lindler and Wereley, 1999). If the sinusoidal excitation displacement resulting from motor cam mechanism is applied to the damper, the damper produces the force.…”

Section: Mr Damper Design and Modelingmentioning

confidence: 99%

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Seismic Control of Civil Structures Utilizing Semi–Active MR Braces

Hiemenz

Choi

Wereley³

2003

Computer aided Civil Eng

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This paper presents the feasibility and effectiveness of magnetorheological (MR) braces in earthquake hazard mitigation. In doing so, a nondimensional variable, β, which is the ratio of the yield force of the MR damper to forcing input (the product of a characteristic mass of the building and the seismic acceleration) is used to design the MR damper preventing the locked damper motion that may worsen seismic response of the building. From this theoretical analysis, the activation gap of the damper as an important design parameter to prevent the locked damper motion is chosen. Based on this analysis, the MR damper is fabricated by modifying the commercial MR damper of Lord Corporation, SD-1000-1. Then, a three-story building with MR braces is constructed and its dynamic equation is theoretically derived. In order to investigate semi-active control methods to MR braces, three different control algorithms are formulated and evaluated both numerically and experimentally. The results show that control of the building with semi-actively controlled MR braces is very effective.

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“…Ifδ = 1, the force on the damper shaft, f d , becomes the yield force, F y Lindler and Wereley, 1999). Thus, Equation (11) becomes:τ…”

Section: Mr Damper Scalingmentioning

confidence: 99%

Section: Mr Damper Scalingmentioning

confidence: 99%

Section: Mr Damper Design and Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Seismic Control of Civil Structures Utilizing Semi–Active MR Braces

Hiemenz

Choi

Wereley³

2003

Computer aided Civil Eng

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“…[15,16] ) ( 2 12 The force generated by the MR fluids due to the squeeze flow is given as Equation (3). [17] ) ( The total resistive force generated by activating multiple modes of the MR fluids is simply computed by summing (1), (2), and (3).…”

Section: B Performance Analysismentioning

confidence: 99%

Design of a new miniature haptic button based on magneto-rheological fluids

Ryu

Yang

Kim³

et al. 2012

2012 IEEE International Conference on Automation Science and Engineering (CASE)

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“…Magnetorheological (MR) fluids can be used in a variety of smart semi-active systems, such as in optical polishing 1 and fluid clutches, 2 as well as in aerospace, automotive, 3,4 and civil damping applications. 5 In active systems, the ER/MR fluid can be used as a fully active actuator in conjunction with a conventional hydraulic pump.…”

Section: Introductionmentioning

confidence: 99%

Magnetorheological Hydraulic Actuator Driven by a Piezopump

et al. 2003

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Magnetorheological (MR) fluids can be used in a variety of smart semi-active systems. The MR damper shows an especially great potential to mitigate environmentally induced vibration and shocks. Another aspect of MR fluids is the construction of MR valve network in conjunction with a hydraulic pump resulting in a fully active actuator. These devices are simple, have few moving parts and can be easily miniaturized to provide a compact, high energy density pressure source. The present study describes a prototype MR-piezo hybrid actuator that combines the piezopump and MR valve actuator concepts, resulting in a self-contained hydraulic actuation device without active electromechanical valves. Durability and miniaturization of the hybrid device are major advantages due to its low part count and few moving parts. An additional advantage is the ability to use the MR valve network in the actuator to achieve controllable damping. The design, construction and testing of a prototype MR-piezo hybrid actuator is described. The performance and efficiency of the device is derived using ideal, biviscous and Bingham-plastic representations of MR fluid behavior, and is evaluated with experimental measurements. This will provide a design tool to develop an actuator for a specific application.

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Analysis and Testing of Electrorheological Bypass Dampers

Cited by 16 publications

References 0 publications

Seismic Control of Civil Structures Utilizing Semi–Active MR Braces

Seismic Control of Civil Structures Utilizing Semi–Active MR Braces

Design of a new miniature haptic button based on magneto-rheological fluids

Magnetorheological Hydraulic Actuator Driven by a Piezopump

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