Uniform damping control of spacecraft

Silverberg, Larry

doi:10.2514/3.20093

Cited by 47 publications

(16 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This section contains a brief overview of UDNC [1]. In UDNC a control scheme is utilized, in which the control force is a linear function of the displacement and the velocity of the structure, expressed as…”

Section: Uniform Damping Control Overviewmentioning

confidence: 99%

“…It dampens motion over an entire structure by damping every mode of vibration at the same decay rate. It is advantageous because the eigenquantities are preserved, allowing for energy-efficient vibration control, and because the proper choice of control gains decouples the modes in the control system [1]. When UNDC is coupled with nodal control theory (NCT) a means for actuator and sensor placement is added [2].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Scanning Tunneling Microscopy and Near Edge X-ray Absorption Fine Structure Studies of Adsorption of Trans-2-butene on Pd(110)

Katano

Kim

Furukawa

et al. 2002

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

This paper introduces a model for a vibration control system in which spatially etched polyvinylidene fluoride (PVDF) was utilized to implement uniform damping control on a distributed system. Uniform damping node control (UDNC) theory states that near optimal vibration control can be achieved when the following criteria are met: all modes are damped at the same exponential decay rate, the open-loop and closed-loop natural frequencies of the structure are identical and the closed-loop modal shapes are identical to the open-loop modal shapes. To help accomplish this, in a system with N modes participating in a response, sensor/actuator pairs are placed at the nodes of the N + 1 modes. Spatially shaded PVDF actuators are distributed actuators that produce pseudo-discrete forces due to the special weighting applied to the etched electrodes. The system was demonstrated using a spring steel cantilevered beam and spatially etched PVDF actuators that were placed according to nodal control theory. When given the set of gains that are attributed to UDNC, the modes de-couple, reducing spillover. This experiment marks the first time that uniform damping control has been realized experimentally.

show abstract

Section: Uniform Damping Control Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scanning Tunneling Microscopy and Near Edge X-ray Absorption Fine Structure Studies of Adsorption of Trans-2-butene on Pd(110)

Katano

Kim

Furukawa

et al. 2002

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…The components of the six discrete control forces acting in the 5 2 direction are expressed in terms of a distributed control force as with /= (5) fir = .///• (0» the rth discrete control force in 8/ direction applied at x r d r = d(x -x r ), the spatial Dirac-delta function at x r The decentralized feedback maneuvers described in the next sections uniformly dampen the beam motion. 2 The beam motion is damped relative to a shadow beam specified in advance by the designer. The associated control law has the form Throughout the remainder of the paper, the elastic motion of the beam is expressed as a linear combination of the 10 lowest natural modes of vibration.…”

Section: (4)mentioning

confidence: 99%

“…An inherent level of system level reliability is then obtained by suppressing motion relative to the shadow spacecraft using decentralized feedback. 2 In Sec. II, the dynamics of a nondimensional free-free beam with well-separated dimensions are described, and a general formulation for the associated control law is given.…”

Section: Introductionmentioning

confidence: 98%

Decentralized feedback maneuver of flexible spacecraft

Silverberg

Foster

1990

Journal of Guidance, Control, and Dynamics

Self Cite

View full text Add to dashboard Cite

This paper describes a novel approach to flexible spacecraft maneuver in which spacecraft motion relative to the motion of a shadow spacecraft is suppressed using a decentralized feedback control. The shadow spacecraft is a fictitious spacecraft that can be positioned, oriented, and allowed to undergo elastic deformations at the discretion of the designer. First, rest-to-spin maneuvers are investigated, with different choices for the shadow coordinates;. The angular velocities of the shadow coordinates are chosen as step functions, quadratic functions corresponding to minimum fuel maneuvers for rigid bodies, and quadratic functions with lag compensation in which the lag is associated with the spacecraft angular velocities relative to the shadow spacecraft angular velocities. The performance of the maneuvers is illustrated in the presence of multiple actuator failures. Next, both in-plane and out-of-plane rest-to-rest maneuvers are investigated. The associated shadow coordinates are chosen to correspond to those of minimum fuel maneuvers and minimum fuel maneuvers with lag compensation.

show abstract

“…An approach from the literature which uses the ideal of many localized reductions to produce a global reduction has been called 'nodal control' [12][13][14][15][16]. In that set of work the aim was typically the reducing global vibration, not global sound radiation.…”

Section: Introductionmentioning

confidence: 99%