Practice-Relevant Aspects of Constructing Er Fluid Actuators

Janocha, Hartmut; Rech, B.; Bölter, Ralf

doi:10.1142/s0217979296001690

Cited by 12 publications

(3 citation statements)

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“…A great deal of research has been conducted on semiactive systems to look for a compromise between passive and active isolation systems (Firoozian, 1995;Janocha et al, 1995;Leek, 1995;Mui, 1995;See, 1995;Sproston, 1995Sproston, , 1997Weyenberg, 1995;Bolter et al, 1997;Jeon, 1997Khusid, 1997;Li, 1997;Riha, 1997;Shimada, 1997;Tang, 1997;Bolter, 1998;Pang et al, 1998;Lee et al, 1999;Tao et al, 1999;Wang, 1999;Yamamoto and Nakano, 1999;Hopkins and Patrick, 2002;Stelzer, 2002;Tewani and Sanjiv, 2002;Lord Corporation, 2003). The semi-active system has the ability to react to input from sensors providing real time control.…”

Section: Er/mr Fluid Isolator Systemsmentioning

confidence: 99%

A Magnetorheological Semi-Active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles

Stelzer

Schulz

Kim

et al. 2003

Journal of Intelligent Material Systems and Structures

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The demand for low cost, quiet operation, and increased operator comfort in automobiles and other applications is requiring that new techniques be developed for noise and vibration isolation. One approach to reduce noise and vibration harshness is to develop a small low cost vibration isolator that can be used to mount components that generate vibration. To develop this isolator, passive, semi-active, and active control methods and different types of smart materials were studied. Based on this study, the most promising approach seems to be a semi-active magnetorheological isolator. An isolator of this type was designed to mount a compressor on an automobile body and to isolate the body from high frequency vibration produced by the compressor. This application is more difficult than the problem of isolating a component from vibration of a base because here vibration is also produced by the component. The new results that this study provides are: (i) a simulation model of a semi-active control system with a magnetorheological isolator, a low pass filter, and base and rotating unbalance excitations, (ii) detailed simulation studies showing the practical trade-offs between passive and semi-active isolator performance, and the effect of phase lag due to low pass filtering, and (iii) an electronically controlled isolator design that can turn filtering on or off to provide durability and isolation performance that cannot be achieved using a passive isolator alone. The isolator design proposed here can have several applications. These include engine mounts, pumps, and fans in automobiles, and the isolation of aviation and naval components where the isolator must be durable enough to withstand low frequency vibration and shock loading through its base, and at the same time prevent transmission of high-frequency vibration from the component to the mounting structure.

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Section: Er/mr Fluid Isolator Systemsmentioning

confidence: 99%

A Magnetorheological Semi-Active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles

Stelzer

Schulz

Kim

et al. 2003

Journal of Intelligent Material Systems and Structures

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“…A clear relationship between the different valve sizes was shown, viz. eo f(P,,tb,l1,) (1) that is, with flow under electric field control E (assumed to be uniform between the electrodes), valve pressure drop AP is a function of mixture density p, viscosity coefficient i, a yield stress tb, electrode separation gap h and length £, and mean fluid velocity ii between the electrodes. Neglecting flow development effects which if present may be represented in a further dimensionless parameter h I£ , and where = MP I2 is the wall shear stress corresponding with pressure drop A the valve performance can then be characterised by the three dimensionless groups…”

Section: Continuum Properties Of Electro-rheological Fluidsmentioning

confidence: 99%

<title>Technique for the normalization of electro-rheological fluid performance data in cylindrical/shear and pressure/flow modes of steady operation</title>

Peel

Bullough

1998

SPIE Proceedings

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A general technique providing effective but approximate characterisation of electro-rheological fluids as continua (as against their apparent device specific performance) is extended by relating data from cylindrical, sliding electrode induced shear flow, and fixed, plane electrode, pressure induced linear flow types of test rigs. The motion being laminar, use is made of the well known Buckingham relationships: the yield stress in the fluid is taken to vary at constant excitation whilst the well defined unexcited viscosity remains fixed. On the basis of experimental data, and within an acceptable error band (for engineering design purposes) the two modes of operation are shown to share common fluid characteristics in terms of HedstrOm and Reynolds Numbers at constant excitation, and when these are related to a Friction Coefficient, a technique of using 'fluid alone' data is made available. This technique allows small sample, low shear rate fluid test results from Couette-type apparatus to be applied in user friendly fashion to the prediction of performance of parallel plate valves and cylindrical clutches operating in the engineering scale.

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“…Therefore, ERFs are highly amenable to an efficient control of the transmission of forces. They are thus potentially useful for applications in hydraulic systems and automotive devices such as clutches, engine bearings, and shock absorbers (cf., e.g., [15][16][17]20,21,39]). The new generation of ERFs which has been developed in recent years features high ER effects by direct activation through electrical signals with an adaptation of the forces in the range of milliseconds that goes along with low abrasive wear, good redispersibility, and high shear stress and sedimentation stability (see [5,3,37]).…”

Section: Introductionmentioning

confidence: 99%

Modelling, Simulation, and Control of Electrorheological Fluid Devices

Hoppe

Mazurkevitch

Rettig

et al. 2000

Lectures on Applied Mathematics

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The new generation of electrorheological fluids (ERFs) offers a wide range of applicability in fluid mechatronics with automotive ERF devices such as ERF shock absorbers mentioned at first place. The optimal design of such tools requires the proper modelling and simulation both of the operational behaviour of the device itself as well as its impact on the dynamics of the complete vehicle. This paper addresses these issues featuring an extended Bingham fluid model and its numerical solution as well as substitutive models of viscoeleastic-plastic system behaviour. Also control issues for optimal semi-active suspension of vehicles with controllable ERF shock absorbers are discussed.

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Practice-Relevant Aspects of Constructing Er Fluid Actuators

Cited by 12 publications

References 0 publications

A Magnetorheological Semi-Active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles

A Magnetorheological Semi-Active Isolator to Reduce Noise and Vibration Transmissibility in Automobiles

<title>Technique for the normalization of electro-rheological fluid performance data in cylindrical/shear and pressure/flow modes of steady operation</title>

Modelling, Simulation, and Control of Electrorheological Fluid Devices

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