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Topic: Controllability

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In the News (Thu 23 May 19)

  Publications about 'controllability'
This paper shows that, for time varying systems, global asymptotic controllability to a given closed subset of the state space is equivalent to the existence of a continuous control-Lyapunov function with respect to the set.
Weak controllability of bilinear systems is preserved under sampling provided that the sampling period satisfies a condition related to the eigenvalues of the autonomous dynamics matrix.
It is shown that a control system in Rn is asymptotically controllable to the origin if and only if there exists a positive definite continuous functional of the states whose derivative can be made negative by appropriate choices of controls.
www.mit.edu /~esontag/PUBDIR/Keyword/CONTROLLABILITY.html   (2366 words)

  Controllability - Wikipedia, the free encyclopedia
Controllability is an important property of a control system, and the controllability property plays a crucial role in many control problems, such as stabilization of unstable systems by feedback, or optimal control.
Controllability and observability are dual aspects of the same problem.
Note that controllability does not mean that once you reach a state that you will be able to keep it there, merely that you can reach that state.
en.wikipedia.org /wiki/Controllability   (760 words)

 PlanetMath: controllability
A control system is said to be (completely) controllable if, for all initial times and all initial states, there exists some input function (or sequence for discrete systems) that drives the state vector to any final state at some finite time.
This is version 3 of controllability, born on 2004-08-05, modified 2004-08-10.
Object id is 6073, canonical name is Controllability.
www.planetmath.org /encyclopedia/Controllability.html   (87 words)

 "Encyclopedia of Mental Health: Shyness"
It is also important to distinguish between cultural values that promote shyness as a social control mechanism or a desired form of modesty and respect for authority, on one hand and personal values on the other hand that make shyness an undesirable constraint on autonomy and self-development.
Controlled studies are needed to assess the effects of these agents.
Because controllability appears to be an important negative predictor of shyness, a model of cure that implies a passive recipient is unlikely to be useful or efficacious.
www.shyness.com /encyclopedia.html   (7431 words)

 Citations: Controllability and stabilizability theory for linear partial differential equations - recent progress and ...
D.L. Russell, Controllability and stabilizability theory for linear partial di#erential equations: recent progress and open questions, SIAM Rev. 20 (1978), 639-739.
Russell, Controllability and stabilizability theory for linear partial di#erential equations: recent progress and open questions, SIAM Rev., 20 (1978), 639-739.
D.L. Russell, Controllability and stabilizability theory for linear partial di#erential equations: recent progress and open questions, SIAM Rev., 20 (1978), pp.639-739.
citeseer.ist.psu.edu /context/98944/0   (1056 words)

 CiteULike: On the controllability of nearest neighbor interconnections   (Site not responding. Last check: 2007-10-26)
In this paper we derive necessary and sufficient conditions for a group of systems interconnected via nearest neighbor rules, to be controllable by one of them acting as a leader.
It is indicated that connectivity seems to have an adverse effect on controllability, and it is formally shown why a path is controllable while a complete graph is not.
The dependence of the graph controllability property on the size of the graph and its connectivity is investigated in simulation.
www.citeulike.org /user/ngoncalves/article/748092   (346 words)

 [No title]   (Site not responding. Last check: 2007-10-26)
Enforcement of Security Policies vs. Control of DES Although [1] concludes that security automata can be used for execution monitoring of safety properties, and gives some preliminary consideration about the realization, no investigation has been seen either in [1] or the literature regarding the detail of the implementation of such enforcement mechanisms.
Control of DES is indicating strong relation with the enforcement of security policies.
After we have the two sub-automata for the sub-policies, the set of all controllable actions and the set of all observable actions are fixed, the EM enforcement of security policies becomes exactly a control problem of decentralized DES, and the decentralized DES theories [6, 7] may apply.
www.qucis.queensu.ca /home/huang/elec843/elec843project.doc   (2594 words)

 Tests for Controllability and Observability
Controllability and observability can also be inferred from the structure of certain special-type realizations, such as the Kalman controllable or observable forms (see Section 8.2).
In fact, in some cases the size of the controllable or observable subspace is computed internally when arriving at the realization of the special form.
As the size of the controllable subspace is less than the number of states, the system is not controllable.
documents.wolfram.com /applications/control/ControllabilityandObservability/7.1.html   (365 words)

 Active Skim View of: Ship Controllability
Such a reference value would represent controllability resulting in minimum deviation between actual and projected maneuvers, or in other words, the ship is optimally controllable when it performs maneuvers that show the closest agreement with the hypothetical maneuver designed for the waterway.
It was seen in the previous section that in zero-current conditions the required width of lane in the approach channel changed from 290 m to 600 m when the width of the port entrance changed from 500 m to 300 m.
It was seen in the previous section that for the design concept A, the required width of lane in the approach channel changed from 290 meters when there was zero current to 620 meters when the ship had to sail in a variety of crosscurrents with a maximum speed of 3 knots.
www.nap.edu /nap-cgi/skimit.cgi?isbn=POD094&chap=75-94   (782 words)

 Controllability   (Site not responding. Last check: 2007-10-26)
If we can "steer" a system to a certain state by controlling its inputs, we can then ask ourselves if there is a way to find the most efficient method of making this transformation.
The controllable space can then be found by taking the image of this matrix.
However, if this inequality is not satisfied and the determinant of the controllability matrix is 0, then we know that it is not full rank.
cnx.org /content/m2120/latest   (468 words)

 Simulation and Control - The System Modeling World   (Site not responding. Last check: 2007-10-26)
The controllability and observability of a linear plant is one of the key areas in automatic control theory.
The structural controllability and observability of a system can be ascertained beforehand through inspection of causal paths in the bond graph model, though eventually they may be in disagreement with the obtained results at a parametric level for some specific values.
The rank of controllability matrix depends on numerical values of the parameters and hence cannot be considered as an measure of robustness of the control strategy.
www.bondgraphs.com /sandc.html   (6694 words)

 The Greening of Dana - Controllability of Systems   (Site not responding. Last check: 2007-10-26)
The new mechanical and electrical systems are easily monitored and highly controllable.
All systems have Direct Digital Controls (DDC) that display the current status of the system, so that any problems, leaks, shortages, etc. can be quickly addressed.
Many of the systems (light, temperature) are operable in individual spaces so that they can be tailored to any given occupant's needs.
www.snre.umich.edu /greendana/conservation/controls.php   (105 words)

 APMRN - The Myth of the Controllability of Difference - Stephen Castles
Attempts by recently established nation-states to control such movements are often hampered by time-honoured customs and cultural affinities—as well as by modern economic, social and political factors.
The state had final control of all flows across the borders, whether of capital, commodities, cultural products or people (provided, of course, that it had the capacity to enforce this control).
However, they also believe that difference is controllable: either the immigrants will be absorbed into an unchanged national community (assimilation); or they will be sent away as soon as their labour is no longer needed (differential exclusion).
www.unesco.org /most/apmrcast.htm   (9716 words)

 Citations: Null controllability of linear systems with constrained controls - Schmitendorf, Barmish (ResearchIndex)
....see that local null controllability in the sense of Definition 1 is implied by the apparently weaker condition obtained by letting T depend on x 0 rather than on the neighbourhood V.
As K is increasing the complexity of the controllable set is....
In general, null controllable systems are not globally stabilizable by bounded linear control laws.
citeseer.ist.psu.edu /context/21210/0   (1660 words)

 Controllability and Observability
Of course, since we started with a transfer function, any pole-zero cancellations should be dealt with at that point, so that the state space realization will always be controllable and observable.
This is why plucked and struck strings are generally excited near one end, and why magnetic pick-ups are located near the end of the string.
A basic result in control theory is that a system in state-space form is controllable from a scalar input signal
ccrma.stanford.edu /~jos/filters/Controllability_Observability.html   (394 words)

 Controllability and Observability Grammians   (Site not responding. Last check: 2007-10-26)
The finite controllability grammian at time tandlt;∞ is defined as follows.
Using the controllability grammian, we can determine how to most efficiently take a system from the zero state to a certain state x.
Parallel to the finite controllability grammian, the kernel of finite observability grammian is equal to the kernel of the observability matrix.
cnx.org /content/m2122/latest   (466 words)

 Control Engineering - Controllability and profitability   (Site not responding. Last check: 2007-10-26)
The theory of MPC is based on solving a quadratic objective function that penalizes tracking error and manipulated variable moves subject to the dynamic model of the process, which is usually based on step tests of the process.
It is difficult to relate controllability and profitability because the economic justification of process control is multi-faceted.
Improved process control can be used to maximize yield of chips per wafer, decreased cost of ownership of equipment by minimizing cycle time, and decreased rework resulting from out-of-specification chips.
www.manufacturing.net /ctl/article/CA478460   (652 words)

 Tinbergen And Theil Meet Nash: Controllability In Policy Games
We show how this generalized version of controllability can profitably be used to deal with policy ineffectiveness issues and Nash equilibrium existence.
If you experience problems downloading a file, check if you have the proper application to view it first.
Keywords: Policy games, policy ineffectiveness, static controllability, Nash equilibrium existence.
ideas.repec.org /p/wpa/wuwpma/0504036.html   (456 words)

 Controllability analysis in a convex domain.
More natural considerations imply that controls have to be bounded by some known functions.
In other words, the problem is to study cart controllability on a domain D by the following class of admissible controls.
In general, control constraints change the life of the cart in a bad way.
math.la.asu.edu /~nikitin/Control/lect1/node4.html   (555 words)

 Controllability of a cart garland.
In general, a domain D is not a controllable foliation.
Recall that a digraph is called strongly connected if from any vertex one can reach a preassigned one by moving along the edges of the digraph in accordance with their orientation.
is a controllable foliation generated by the system under consideration.
math.la.asu.edu /~nikitin/Control/lect3/node1.html   (835 words)

 Aircraft (Science Tracer Bullet - Science Reference Services, Libraryof Congress)
Automatic control in aerospace 1998: a proceedings volume from the 14th IFAC Symposium, Seoul, Korea, 24-28 August 1998.
Synthesis of nonlinear controller to recover an unstable aircraft from poststall regime.
Control and handling qualities considerations for an advanced supersonic transport aircraft.
www.lcweb.loc.gov /rr/scitech/tracer-bullets/aircrafttb.html   (1793 words)

 Balance of Controllability vs. Guidance - Amodality vs. Modality
Controllability is often translated as "the user is in charge, not the computer." The user should hold the initiative at all stages of the processing.
With regard to simplification, you have to balance controllability with guidance for an optimal solution.
Setting the user in control should be your primary option when you are considering control issues.
www.sapdesignguild.org /resources/simplification/Principles/Control.htm   (736 words)

 Perceived Controllability Modulates the Neural Response to Pain -- Salomons et al. 24 (32): 7199 -- Journal of ...
Cues were presented in which the color of the diamond indicated whether a subject could control the length of the heat.
In the controllable condition, subjects were instructed that if they moved the joystick in the direction of the arrow and their response was faster than a threshold (based on their previous response times), they would receive the short (2 sec) rather than long (5 sec) heat.
Areas shaded in green were significantly activated in both the uncontrollable and controllable conditions but were significantly more activated when the pain was perceived to be uncontrollable [(UC and C) and (UC - C)].
www.jneurosci.org /cgi/content/full/jneuro;24/32/7199   (3302 words)

 Netwings - CFS3 Me262 Aircraft controllability
Is there anyone out there who can tell me how to fix a problem with some of the a/c.
The Me262 and Mosquito are very hard to control in pitch.
I can improve it by turning off the auto trim function, but the a/c still tend to wander in the vertical plane & can be hard to fly accurately.
www.netwings.org /dcforum/DCForumID27/4629.html   (291 words)

The main purpose of this book is to provide a self-contained, complete and geometrically clear presentation of the recent results on global controllability and stabilization.
It contains many pictures and exercises so as to develop a geometrical control intuition and inspire the reader to think independently.
The material presented is organized such that for Part I, it is only assumed that the reader has mastered the very basic notions of ordinary differential equation theory, general topology and analytic geometry.
www.worldscibooks.com /mathematics/2371.html   (171 words)

 Citebase - Characterization of Local Configuration Controllability for a Class of Mechanical Systems
Authors: Cortes, J. Martinez, S. We investigate local configuration controllability for mechanical control systems within the affine connection formalism.
Extending the work by Lewis for the single-input case, we are able to characterize local configuration controllability for systems with n degrees of freedom and n-1 input forces.
Citation coverage and analysis is incomplete and hit coverage and analysis is both incomplete and noisy.
www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:math/0009095   (656 words)

 DMTCS vol 1 no 1 (1997), pp. 239-246   (Site not responding. Last check: 2007-10-26)
The aim of this paper is to present some recent results on controllability of right-invariant systems on Lie groups.
From the Lie-theoretical point of view, we study conditions under which subsemigroups generated by half-planes in the Lie algebra of a Lie group coincide with the whole Lie group.
Yuri L. Sachkov (1997), Controllability of affine right-invariant systems on solvable Lie groups, Discrete Mathematics and Theoretical Computer Science 1, pp.
dmtcs.loria.fr /volumes/abstracts/dm010115.abs.html   (159 words)

 STLC: Controllability that handles obstacles
The controllability concept discussed so far has no concern for how far the trajectory travels in
It should declare that if a state is reachable from another in the absence of differential constraints, then it is also reachable with the given system
A concept closely related to controllability is accessibility, which is only concerned with the dimension of the reachable set.
msl.cs.uiuc.edu /planning/node811.html   (522 words)

 Vita   (Site not responding. Last check: 2007-10-26)
Appelbaum, A.S., Tuma, J.M., and Johnson, J.H. Internal-external control and assertiveness in subjects high and low in social desirability.
Johnson, J.H. and Cerreto, M.C. Internal-external control and interpersonal attraction to a similar and dissimilar stranger.
Jorgensen, R.S. and Johnson, J.H. Contributors to the appraisal of major life changes: The role of perceived controllability, stimulation seeking, social support, and prior life events.
www.clinicalchild.com /Vita.htm   (2204 words)

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