Electrostatically Formed Antennas

Mihora, Dennis; Redmond, P. J.

doi:10.2514/3.57766

Cited by 29 publications

(13 citation statements)

References 1 publication

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“…First, the membrane collapse phenomenon is included in the equation. The membrane collapse is associated with a structural instability of the system 7,8 . As the voltage increases the membrane deflects closer to the electrode, thus increasing the electrostatic load acting on the membrane.…”

Section: Resultsmentioning

confidence: 99%

Thrust performance of micromachined synthetic jets

Mueller¹,

Bernal²,

Moran³

et al. 2000

Fluids 2000 Conference and Exhibit

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The performance of synthetic jets produced by an electrostatically driven acoustic resonator is discussed. A reduced order model of the coupled membrane motion and acoustic field in the resonator is used to determine thrust and power consumption. The coupled system presents unique features depending on the pressure coupling parameter defined as the ratio of the pressure force on the membrane to its inertia. Thrust output increases as the pressure coupling parameter decreases and for stiffer membranes. Theoretical thrust performance of the order of 50 µN per resonator, and power to thrust ratio in the range 20-60 m/s could be achieved. We report also progress in the development of a micro propulsion system based on synthetic jets. Measurements of the membrane deformation and flow at the exit of the synthetic jets are reported.

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Section: Resultsmentioning

confidence: 99%

Thrust performance of micromachined synthetic jets

Mueller¹,

Bernal²,

Moran³

et al. 2000

Fluids 2000 Conference and Exhibit

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“…The equilibria are unstable for x < |. While this is different than the x < | predicted by more accurate models and confirmed by experiment [6], this simplified model captures the salient aspect-the instability of equilibria at large deflections.…”

Section: Plant Model and Simulation Parametersmentioning

confidence: 59%

“…Work led by Dennis Mihora [6] (mid-1970's) and Goslee [7] (1978-82) looked at a concentric arrangement of electrodes. Work done by Lang [8] (1978-82) considered a faceted arrangement of electrodes and investigated an LQG based controller.…”

Section: Introductionmentioning

confidence: 99%

“…The goal is to deform the membrane so that its center is deflected approximately 70% of the original membrane-electrode gap distance. The difficulty arises in that there are no stable equilibria beyond a deflection of 50% of the original gap distance [6]. Ideally, the membrane should be deflected as much as possible, decreasing the focal length and hence, the support structure.…”

Section: Introductionmentioning

confidence: 99%

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Electrostatic control of a membrane using adaptive feedback linearization

Scharf¹,

Hyland²,

Washabaugh³

1998

Guidance, Navigation, and Control Conference and Exhibit

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Inflatable, ultra-lightweight antennas using metallized membranes for reflectors are being investigated for use in orbital telescopes and solar energy applications. Simulation results for the control of a simplified model of a membrane using an electric field are reported. The non-linear mapping from position and acceleration of the center of the membrane to control input is learned on-line, and simultaneously used to approximately feedback linearize the SISO plant. Two types of inverse plant model structures are studied: neural nets with sigmoid non-linearities and adaptively constructed look-up tables. In both cases, using only input-output data, the simplified membrane model was successfully stabilized about an unstable equilibrium.

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“…A consequence of this quadratic nonlinearity is the fact that the electromagnetic force is able to pull but not push (assuming a nonmagnetic target mass) and thus the actuation is one-sided. The same observations apply to electrostatic actuation, which is used in MEMS devices [10,11] and flexible antennas [12,13].…”

Section: Introductionmentioning

confidence: 65%

Setpoint Control of the Uncertain Electromagnetically Controlled Oscillator

Yan

D’Amato

Bernstein

2012

Volume 1: Adaptive Control; Advanced Vehicle Propulsion Systems; Aerospace Systems; Autonomous Systems; Battery Modeling; Bioch

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We apply an extension of retrospective cost adaptive control (RCAC) to a command-following problem for the uncertain electromagnetically controlled oscillator (ECO). We assume that an estimate of the first Markov parameter of the discretized and linearized plant is known, but RCAC does not require knowledge of the inertia, damping, or stiffness of the plant. RCAC uses a setpoint feedback path and an auxiliary nonlinearity to stabilize the unstable ECO at the commanded equilibria.

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Electrostatically Formed Antennas

Cited by 29 publications

References 1 publication

Thrust performance of micromachined synthetic jets

Thrust performance of micromachined synthetic jets

Electrostatic control of a membrane using adaptive feedback linearization

Setpoint Control of the Uncertain Electromagnetically Controlled Oscillator

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