Showing papers on "Decoupling (electronics) published in 1971"
239 citations
45 citations
TL;DR: In this article, conditions under which decoupling is possible are formulated and the matrices effecting decoupledness are given, and the inverse of a general time-variable multivariable system is also determined.
Abstract: System decoupling by state variable feedback is demonstrated for the time-variable case. Conditions under which decoupling is possible are formulated and the matrices effecting decoupling are given. The inverse of a general time-variable multivariable system is also determined. By applying this inverse a new synthesis method is developed.
33 citations
TL;DR: In this article, the concept of controllable output subspaces is introduced to solve a generalized state-feedback decoupling problem, and necessary and sufficient conditions for an output subspace to achieve controllability are given.
Abstract: he geometric theory of linear multivariable systems is extended by introducing the concept of a controllable output subspace. Necessary and sufficient conditions for an output subspace to be controllable are given. As an example application, controllable output subspaces are used to solve a generalized state-feedback decoupling problem.
30 citations
TL;DR: In this article, the theory of state-variable feedback decoupling in multivariable control systems is generalized to include the case where a subset of the output set is the candidate for decoupled.
Abstract: The theory of state-variable feedback decoupling in multivariable control systems is generalized to include the case where a subset of the output set is the candidate for decoupling. Systems in which such decoupling is employed will be termed "partially decoupled." Decoupling a selected set of outputs, when achieved by using a state feedback matrix F and a nousingular ( m \times m ) input matrix G , will be called m -input decoupling (MID), to reflect the restriction on the input matrix. An algorithm, developed by Silverman for constructing inverse systems, is shown to play an essential role in the MID problem, and using matrices constructed in the algorithm, necessary, and sufficient conditions for m -input decoupling the specified set of outputs are obtained. As would be expected, these necessary and sufficient conditions include the existing conditions for decoupling all system outputs as a special case. An example is given illustrating the results.
20 citations
TL;DR: In this paper, a sufficient condition for the decoupling of a special class of nonlinear time-invariant systems is developed, and a definition of decoupled nonlinear systems is also provided.
Abstract: This paper develops a sufficient condition for the decoupling of a special class of nonlinear time-invariant systems. A definition of decoupling for nonlinear systems is also provided.
18 citations
TL;DR: In this paper, the concept of decoupling by state-variable feedback in multivariable systems theory is extended from its normal interpretation of decoding output elements to that of decoding groups, or subsets of the output vector.
14 citations
TL;DR: In this paper, the design of series compensators necessary for decoupling of multivariable systems possessing weak inherent coupling by state feedback is studied, and a method of synthesis, which introduces the minimum number of dynamic elements in the compensator and places all its poles at the origin of the complex frequency plane, is given.
Abstract: This paper studies the design of series compensators necessary for decoupling of multivariable systems possessing weak inherent coupling by state feedback. An alternate characterization of weak inherent coupling is given in the form of an algorithm which plays a key role in deriving the properties and the general solution for the parameters of the compensator. A method of synthesis, which introduces the minimum number of dynamic elements in the compensator and places all its poles at the origin of the complex frequency plane, is given.
13 citations
Patent•
08 Nov 1971
TL;DR: In this paper, a device for attachment of electroacoustic transducers in casings immersed under water and effecting mechanical decoupling through flexible or deformable portions such as rubber or elastomer rings between the vibrating parts and their support is presented.
Abstract: A device for attachment of electroacoustic transducers in casings immersed under water and effecting mechanical decoupling through flexible or deformable portions such as rubber or elastomer rings between the vibrating parts and their support.
9 citations
TL;DR: In this paper, a method for removing hydrogen-deuterium dipolar coupling from the n.m.r. spectra of partially oriented molecules is described, and the method is described by which hydrogen and deuterium coupling may be removed from the spectra.
Abstract: A method is described by which hydrogen–deuterium dipolar coupling may be removed from the n.m.r. spectra of partially oriented molecules.
7 citations
TL;DR: Decoupling of 1H−1H and 1H-19F spin-spin n.m.r. splittings upon interaction with paramagnetic complexing agents has been studied in alcohol, carbonyl, and carboxylic acid systems.
Abstract: Decoupling of 1H–1H and 1H–19F spin–spin n.m.r. splittings upon interaction with paramagnetic complexing agents has been studied in alcohol, carbonyl, and carboxylic acid systems.
TL;DR: Necessary and sufficient conditions for decoupling in linear multivariable systems with known plant and observation noise are presented in this article, where the authors consider the case where the system is linear in size.
Abstract: Necessary and sufficient conditions for decoupling in linear multivariable systems with known plant and observation noise are presented.
TL;DR: Decoupling of hydrogen spin-spin n.m.r. splittings upon interaction with paramagnetic complexing agents has been studied in amines and in nitriles as discussed by the authors.
Abstract: Decoupling of hydrogen spin–spin n.m.r. splittings upon interaction with paramagnetic complexing agents has been studied in amines and in nitriles.
TL;DR: This condition was first derived by Falb and Wolovich [1] and a less involved proof is given by Gilbert [2] as mentioned in this paper, who derived it in a slightly more straightforward manner.
Abstract: This condition was first derived by Falb and Wolovich [1]. A less involved proof is given by Gilbert [2]. This correspondence derives it in a slightly more straightforward manner. It is felt that this gives a better understanding of the ideas involved.
01 Jan 1971
TL;DR: In this article, an integrated near-optimum design method is introduced which makes a systematical use of the existing techniques which curbs many complexities involved in industrial systems, and is applied to an Allegheny Ludlum Steel's high speed three-stand mill which can represent a 45-variable control system.
Abstract: : An Integrated Near-Optimum Design Method is introduced which makes a systematical use of the existing techniques which curbs many complexities involved in industrial systems. The method consists of a 'Subsystem' decoupling stage which represents the originally high order model by a set of weakly coupled subsystems of much lower order. The second stage of the design is a 'Time-Scale' decoupling in which the variables are divided into three 'slow', 'basic' and 'fast' categories according to the length of their response times. The slow and fast variables are eliminated and the near-optimum control is obtained by computations involving basic variables only. These two stages of decoupling are readily interchangeable depending on whether the model is linear or nonlinear. The method has been applied to an Allegheny Ludlum Steel's high speed three-stand mill which can represent a 45-variable control system. Both linear and nonlinear dynamic and state space models are presented for the mill. In a digital computer simulation of the nonlinear model, two of the subsystems are studied in detail and an open loop near-optimum control as a power series of a decoupling parameter is obtained. The application of the method to the linear model resulted in an approximate solution of a 17th-order Riccati equation hence a state regulator feed-back gain matrix as a function of a plant parameter. (Author)
TL;DR: A new general form for the determination of all the feedback matrices that decouple a system is presented, which depends directly on the system matrices and involves certain parameters.
Abstract: In this paper a new general form for the determination of all the feedback matrices that decouple a system is presented. This form depends directly on the system matrices and involves certain parameters. A simple procedure to derive the equations that constrain these parameters is given. The question of polo-assignment in a decoupled system is also discussed,
01 Dec 1971
TL;DR: In this paper, the invertibility, reproducibility and decoupling of the class of systems of the Hammerstein form are studied. And the criteria for invertible and reproducible are given in terms of those of the linear dynamic subsystem and in terms with the memoryless nonlinearity in the feedforward path.
Abstract: The invertibility, reproducibility and decoupling of the class of systems of the Hammerstein form is studied. The criteria for invertibility and reproducibility are given in terms of those of the linear dynamic subsystem and in terms of the memoryless nonlinearity in the feedforward path (independently of feedback). It is shown that such a system can be decoupled by dynamic precompensation and (nonlinear) state feedback if and only if it is invertible. For static (no dynamics) decoupling, and additional requirement, namely, the static (G,F)-decouplability of the linear dynamic subsystem, is needed.
Patent•
28 Sep 1971
TL;DR: In this article, the authors propose a simulating device for calculating water discharge and levels in river and canal beds at transient flows, which comprises at least one threshold-setting device and at least two RC networks.
Abstract: A simulating device for calculating water discharge and levels in river and canal beds at transient flows, comprises at least one threshold-setting device and at least two RC networks. Each of the RC networks includes a capacitor and at least two resistors connected to the capacitor via contact groups of the relay of the threshold device. A basic decoupling module separates the RC networks by means of its input being connected to said capacitor of the first RC network and by its output being connected to the input of the other RC network. The time constants of the RC networks are changed at certain voltages by connecting another resistor of the same network to the capacitor through the contact groups of the threshold-setting device. An additional decoupling module is connected to the basic decoupling module and to the input of the threshold-setting device.
TL;DR: These necessary conditions for decoupling multivariable systems by linear state-variable feedback are trivially proven here.
Abstract: In a recent correspondence two necessary conditions for decoupling multivariable systems by linear state-variable feedback are shown through unnecessarily long proofs. These necessary conditions are trivially proven here.
01 Dec 1971
TL;DR: A statistical method is used to find the worst case number of switchings per clock pulse of large digital integrated circuits containing n gates to be 2.12√n, useful in designing decoupling capacitors and in measuring the interference generated.
Abstract: A statistical method is used to find the worst case number of switchings per clock pulse of large digital integrated circuits containing n gates to be 2.12√n. This result is useful in designing decoupling capacitors and in measuring the interference generated.