Showing papers on "Decoupling (electronics) published in 1980"

Compensator synthesis using (C,A,B)-pairs

Abstract: This paper gives a general framework (in the geometric style) for the design of compensators for linear multivariable systems. Basic is the notion of a "( C,A,B )-pair of subspaces." This concept is newly defined here, and we give its simplest application (to the problem of disturbance decoupling by observation feedback). We then formulate a general compensator synthesis principle and show how several well-known synthesis techniques can be derived from it. We also show that "almost all" compensators can be interpreted as observer-based compensators, and discuss the relation between the compensator problem and the stable cover problem.

Decoupling of invertible nonlinear systems with state feedback and precompensation

Abstract: For a class of nonlinear invertible systems considered by Hirschorn [1], a decoupling control synthesis using state feedback and precompensation is presented. Two examples which include decoupling of vertical and horizontal path angles of a terrain-following airplane are presented.

Nonlinear state-variable-feedback excitation-and governor-control design using decoupling theory

Abstract: Modern microprocessor capabilities permit the control designer to consider using relatively complicated nonlinear control algorithms, which would have been considered impractical in the past. The paper presents the results of a study of the potential usefulness of nonlinear decoupling algorithms for the design of excitation and governor controllers for a power system using state-variable feedback. A control law for decoupling rotor angle and field flux is derived. For the rejection of load disturbance, the design of a servocompensator consisting of strings of integrators in the outer ioop around the decoupled inner loop is proposed. The closed-loop system is shown to be asymptotically stable. The system can be transferred to a new operating condition corresponding to any desired terminal voltage Vt and tie-line power Ptie The simulation results using a first-order compensator show that system asymptotically tracks the desired Vt and Ptie under unknown piecewise constant disturbances. Results show good transient and steady-state responses in rotor angle, field flux and frequency. Steady-state errors in Vt and Ptie owing to parameter uncertainty are reduced to zero by changing the command inputs using an external loop. The effect of stochastic load on the response is small.

Sensitivity NMR probe

Abstract: In an NMR probe containing an observe coil and a decoupling coil, the signal-to-noise ratio of the observe channel is improved by inserting a back-to-back parallel combination of diodes in series with the decoupling coil to present an infinite impedance in the decoupling channel in its passive state for induced RF signals from the observe coil.

13C nuclear magnetic resonance spectra of some naturally occurring friedelanones

Abstract: 13C NMR spectra of friedelan, friedelan-21-one, friedelan-6-one, friedelane-321-dione, friedelane-3,6-dione and friedelane-3,6,21-trione have been recorded and signals assigned using off-resonance decoupling, inversion recovery and lanthanide induced shift techniques.

Output feedback decoupling in the frequency domain

Abstract: For plants with invertible transfer matrices, now necessary and sufficient conditions are given for decoupling by constant gain output feedback and by dynamic output feedback. If the latter are not met, a dynamic pre-compensator is required. Design techniques associated with the approach are discussed.

Dual-monitoring protection circuit for switching transistor

Abstract: A transistor having a selectively saturated emitter collector path is protected. The emitter collector voltage level is sensed as being greater than a predetermined level to indicate saturation as is the presence and absence of drive current to the base. In response to the transistor not being activated to saturation while the drive current is applied to the base, a fault indication is derived. In response to the fault being indicated, the transistor is prevented from conducting by decoupling a source of operating voltage and current from the emitter collector path and/or decoupling the drive current from the base.

Combination lock with comparator - receiving signal patterns stored in memory and entered via external keyboard

Abstract: The combination lock has a keyboard for entering signal patterns. A memory stores reference patterns and, unlike the keyboard, is not accessible from outside the device. A comparator compares both patterns and unlocks the lock if they are identical. The user can enter a new reference pattern into the memory via the keyboard when he has unlocked the lock and when a switch inside the device has been switched to 'insert new pattern'. A delay switch delays the unlocking of the lock after the two patterns have been found identical. A decoupling circuit decouples the externally-accessible keyboard from the externally-inaccessible circuitry which includes memory, comparator, switch, unlocking devices etc.

Protective system for electric motors

Abstract: A low winding resistance protective system for electrical motors comprising sensing apparatus for coupling to at least one motor winding and for comparing the winding resistance of a motor when at rest to a predetermined threshold and for providing an output indication in response to exceedance of that threshold and decoupling apparatus for decoupling the at least one motor winding from the sensing apparatus such that high voltages applied to the at least one motor winding during operation of the motor are prevented from reaching the sensing apparatus. An embodiment particularly suitable for use with high voltage motors is also described.

On the dimensions of the supremal (A,B)-invariant and controllability subspaces

Abstract: The dimensions of the supremal output-nulling ( A,B )- invariant and controllability subspaces of a system are explicitly determined. The role of the input and output decoupling zeros is also discussed.

Low winding resistance protective device

Abstract: A low winding resistance protective system for electrical motors comprising sensing apparatus for coupling to at least one motor winding and for comparing the winding resistance of a motor when at rest to a predetermined threshold and for providing an output indication in response to exceedance of that threshold and decoupling apparatus for decoupling the at least one motor winding from the sensing apparatus such that high voltages applied to the at least one motor winding during operation of the motor are prevented from reaching the sensing apparatus.

Carbon-13 Nuclear Magnetic Resonance Spectral Assignments of Grayanotoxin-I

Abstract: The 13C-NMR signals of grayanotoxin-I, a tetracyclic diterpene with an A-nor-B-homo-ent-kaurane skeleton, were assigned by means of single-frequency off-resonance decoupling, selective proton decoupling and by comparison with spectra of derivatives.

Decoupling arrangement for non-insulated AC track circuits in railway systems

Abstract: A decoupling arrangement for non-insulated track circuits is disclosed wherein the receiving circuit of the evaluating unit for the AC track currents is electrically separated from the traction-current-carrying parts of the track. The cross bonds between the two rails of a track may be shorting bonds or so-called S bonds. The arrangement according to the invention improves the tuning behavior of the track circuit receivers considerably.

Some comments on the choice of decoupling scheme for the biquadratic Heisenberg ferromagnet

Abstract: Reviews some early results that have been developed for the biquadratic Heisenberg ferromagnet. A new generalised decoupling scheme is presented for all S>1/2 and several different decoupling choices are discussed. The authors present analytic and numerical results for some of these and compare them with exact low-temperature and high-temperature results.

On the decoupling zeros and poles of a system

Abstract: The polynomial model methods of P. A. Fuhrmann are used to analyze the underlying state space of a system described by a polynomial system matrix. A characterization is obtained for the various types of decoupling zeros and poles of the system in terms of certain modules.

Rise time control circuit for amplifier

Abstract: PURPOSE:To improve the rise by installing the circuit which charges the decoupling capacitor CONSTITUTION:Potential E2 at middle point M between voltage division resistances 12 and 13 is set lower than steady active voltage EC of front-step amplifier 2 and higher than action start voltage E0 each With the make of power switch 11, the charging is given to decoupling capacitor 7 from point M of the voltage division resistances and through diode 14 The circuit can secure the operating state quickly since the time constant is shorter than the charging given through decoupling resistance 8 At the same time, no reverse current flows at the normal state due to diode 14 thus to secure the steady state

Wireless microphone device

Abstract: PURPOSE:To prevent a momentary increase in sound volume and the generation of noise due to the operation stop of a high frequency circuit by attenuating the output signal of a low-frequency amplifier according to the operation state of the high-frequency oscillation circuit of a microphone device CONSTITUTION:A resistance R1 and a capacitor C1 in the microphone device constitute the power source decoupling of an audio amplifier 103, and a resistance R2 and a capacitor C2 constitute the power source decoupling of high-frequency circuits 104-106 When a push button 110 is released during simultaneous sound recording and photography to open a switch 109, the capacitor C2 of the high-frequency oscillation circuit is discharged instantaneously and a relay contact is broken to stop the photography of a camera immediately On the other hand, the base potential of a transistor TRQ1 drops by the discharging of the capacitor C2 to turn on the TRQ1, and then a TRQ2 also turns off Therefore, the output signal of an amplifier 103 is attenuated by a resistance R3 and the TRQ2 and its supply to a modulator 105 is cut off right after the switch 109 is released

Regelung des Nichtlinear Gekoppelten Mehrgrössensystems Roboter

Abstract: The mathematical model of the industrial robot is the base for designing his control. The model is a nonlinear coupled system of 2. order with state variables as output. Decoupling is achieved by choosing the actuating signal as it is given by the equations describing the motion of the robot. The decoupling can be considered as a feedforward compensation of disturbances and a feedforward adaptive control. After decoupling one gets decoupled double integrators.

Ink jet printer and charge decoupling device therefor

Abstract: An ink jet printer includes a charge decoupling device which permits fluid flow of electrically conductive fluid between a high voltage electrode and a grounded fluid reservoir while presenting a high impedance electrical path therebetween. The charge decoupling arrangement includes a nonconductive casing defining an interior casing cavity which is separated into an upper and a lower portion by means of a perforated plate extending horizontally across the cavity. A plurality of drop stabilizers are mounted adjacent associated ones of the perforations to define downwardly extending capillary fluid paths from the perforations into the lower portion of the cavity to form fluid drops which drip off of the bottoms of the stabilizers. The break up of the fluid into drops provides the high impedance path through the charge decoupling device, thus ensuring that the deflection electrode arrangement and the catchers are substantially electrically isolated.

Simplification of an earlier MCSCF procedure for CI expansions involving orbital excitations

Abstract: An earlier version of the MCSCF procedure has been simplified for CI expansions involving orbital excitations only without decoupling. The computational time has been thereby cut down to a quarter of that taken by the earlier version.

Dynamic compensator design for decoupling

Abstract: A flexible technique is proposed for coordinated design of dynamic pre-compensation and dynamic output feedback for decoupling. It is based on the inverse plant transfer matrix, and makes advantageous use of its division into proper and improper parts.

The application of an adaptive noninteracting controller to a motor-generator set

Abstract: Relatively few experimental applications of decoupling theory to actual systems are recorded in the literature. It was decided, therefore, to examine a practical system consisting of a motor-generator machine set controlled by thyristor amplifiers, and to apply a decoupling strategy with adaptive properties to this system. A mathematical model of the coupled system was produced and validated from open-loop steady-state and transient characteristics. The system equations were arranged in state-variable form, and a strategy for decoupling this linearised system was developed theoretically and later confirmed by analogue simulation and actual system tests. It was then necessary to extend this linearised model theory to obtain a generalised nonlinear control strategy in terms of the system output variables; the elements of the feedback and feedforward matrices were made to adapt to the nonlinear effects within the system. Satisfactory decoupling of the appropriate state variables, together with eigenvalue ass...