A Primer on Design of Semiactive Vibration Absorbers (SAVA)

Patten, William; Mo, Changki; Kuehn, J.; Lee, J.

doi:10.1061/(asce)0733-9399(1998)124:1(61)

Cited by 46 publications

(28 citation statements)

References 12 publications

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“…Fluid compressibility is modelled using the mass flow continuity equation, which introduces nonlinear stiffness through the constant bulk modulus term β. Various investigators have used this form of hydraulic model to account for fluid compressibility in semi-active dampers [12][13][14]. However, previous work has not considered impact scenarios, where fluid compressibility effects will be particularly significant.…”

Section: The Mr Shock Strut Modelmentioning

confidence: 99%

“…As an aside, Patten, et al [12] showed that the assumption of constant bulk modulus may not always be valid if there is a substantial change in pressure from the nominal value. Using the methods described by those authors, a variable bulk modulus term was also investigated but this yielded negligible performance differences with the more straightforward model.…”

Section: The Mr Shock Strut Modelmentioning

confidence: 99%

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Magnetorheological landing gear: 1. A design methodology

Batterbee

Sims

Stanway

et al. 2007

Smart Mater. Struct.

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Aircraft landing gears are subjected to a wide range of excitation conditions, which result in conflicting damping requirements. A novel solution to this problem is to implement semiactive damping using magnetorheological (MR) fluids. This paper presents a design methodology that enables an MR landing gear to be optimised, both in terms of its damping and magnetic circuit performance, whilst adhering to stringent packaging constraints. Such constraints are vital in landing gear, if MR technology is to be considered as feasible in commercial applications.The design approach focuses on the impact or landing phase of an aircraft's flight, where large variations in sink speed, angle of attack and aircraft mass makes an MR device potentially very attractive. In this study, an equivalent MR model of an existing aircraft landing gear is developed. This includes a dynamic model of an MR shock strut, which accounts for the effects of fluid compressibility. This is important in impulsive loading applications such as landing gear, as fluid compression will reduce device controllability. Using the model, numerical impact simulations are performed to illustrate the performance of the optimised MR shock strut, and hence the effectiveness of the proposed design methodology. Part 2 of this contribution focuses on experimental validation.

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Section: The Mr Shock Strut Modelmentioning

confidence: 99%

Section: The Mr Shock Strut Modelmentioning

confidence: 99%

Magnetorheological landing gear: 1. A design methodology

Batterbee

Sims

Stanway

et al. 2007

Smart Mater. Struct.

View full text Add to dashboard Cite

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“…In addition, to exactly con"rm the control system's e!ectiveness, an appropriate analytical model is required speci"cally to express the dynamic characteristics of the control device. With respect to the analytical model, several types, such as the magnetorheological damper [6] and the semi-active oil damper [7,12] have been reported. For practical application of the actual control device, we must set up an appropriate analytical model to simulate the behaviours of a wide variety of objective structures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic loading test and simulation analysis of full-scale semi-active hydraulic damper for structural control

Niwa

Kobori

Takahashi

et al. 2000

Earthquake Engng. Struct. Dyn.

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SUMMARYA semi-active hydraulic damper (SHD) for a semi-active damper system, which is useful for practical structural control especially for large earthquakes, has been developed. Its maximum damping force is set to 1 or 2 MN, and it is controlled by only 70 W of electric power. An SHD with a maximum damping force of 1 MN was applied to an actual building in 1998. This paper "rst presents the results of a dynamic loading test to con"rm the control performance of the SHD. Next, an analytical model of SHDs (SHD model) is constructed with the same concept for two kinds of SHDs based on the test results. Through simulation analyses of the test results using the proposed SHD model, the dynamic characteristics of the SHD can be well represented within practical conditions. Simulation analyses are also carried out using a simple structure model with the SHD model. It is shown that this SHD model can be used to precisely evaluate the control e!ect of the semi-active damper system and is useful in practical SHD design under the applied conditions.

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“…variable valve orifice e.g., 6,16,21 or as high-tech as a variable state ''smart'' material such as electrorheological fluid or magnetorheological Ž w x. fluid e.g., 2, 7 . The variability of such devices, regardless of type, can be used to alter the dynamic characteristics of a structure.…”

Section: Introductionmentioning

confidence: 99%

Stability of a Lyapunov Controller for a Semi-active Structural Control System with Nonlinear Actuator Dynamics

Kuehn

Stalford

2000

Journal of Mathematical Analysis and Applications

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We investigate semi-active control for a wide class of systems with scalar nonlinear semi-active actuator dynamics and consider the problem of designing control laws that guarantee stability and provide sufficient performance. Requiring the semi-active actuator to satisfy two general conditions, we present a method for designing quickest descent controllers generated from quadratic Lyapunov functions that guarantee asymptotic stability within the operating range of the semiactive device for the zero disturbance case. For the external excitation case, Ž bounded-input, bounded-output stability is achieved and a stable attractor ball of . ultimate boundedness of the system is computed based on the upper bound of the disturbances. We show that our wide class of systems covers, in particular, two nonlinear actuator models from the literature. Tuning the performance of the simple Lyapunov controllers is straightforward using either modal or state penalties. Simulation results are presented which indicate that the Lyapunov control laws can be selected to provide similar decay rates as a ''time-optimal'' controller for a semi-actively controlled single degree of freedom structure with no external excitation.

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A Primer on Design of Semiactive Vibration Absorbers (SAVA)

Cited by 46 publications

References 12 publications

Magnetorheological landing gear: 1. A design methodology

Magnetorheological landing gear: 1. A design methodology

Dynamic loading test and simulation analysis of full-scale semi-active hydraulic damper for structural control

Stability of a Lyapunov Controller for a Semi-active Structural Control System with Nonlinear Actuator Dynamics

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