Showing papers on "Decoupling (electronics) published in 1975"

Output feedback decoupling

Abstract: New, concise, necessary, and sufficient conditions are derived for dynamically decoupling a large class of linear multivariable systems through the employment of constant gain output feedback. The conditions directly imply a constructive procedure for decoupling and reassigning the closed-loop poles, as illustrated by example.

Spin echo double resonance: a novel method for detecting decoupling in Fourier transform nuclear magnetic resonance

Abstract: It is shown that the combination of double irradiation and a simple two-pulse spin echo sequence is a powerful and sensitive method for detecting homonuclear decoupling in a complex spectrum.

Disturbance localization in linear systems with simultaneous decoupling, pole assignment, or stabilization

Abstract: For a class of constant linear dynamic systems with unmeasurable disturbances, geometric necessary and sufficient conditions are derived for the existence of a state-feedback controller that localizes the disturbances and simultaneously assigns the closed-loop poles or decouples the closed-loop system. These conditions are simple, intuitively appealing, and closely related to the known necessary and sufficient conditions for the separate problems to be solvable alone. Furthermore, it is shown that for these combined problems and for simultaneous disturbance localization and stabilization problems no additional flexibility is afforded by using dynamic compensation instead of static compensation except for the combined problem of disturbance localization and decoupling where the additional flexibility is derived from that for the decoupling problem alone. Under a standard rank assumption, it is established that the combined problem of simultaneously localizing the disturbances, assigning the poles and decoupling the system has no solution. Separate necessary and sufficient conditions are given for the existence of a solution to the combined problem of disturbance localization, stabilization, and decoupling.

Decoupling multivariable systems by optimal control techniques

Abstract: In this paper the problem of decoupling multivariable control systems is treated using the methods of optimal control. It is shown that by introducing the concept of virtual model following the parameters of decoupling gain matrices and dynamic compensators come out from an optimization process that allows one to perform any trade-off between the degree of decoupling, the degree of matching ideal decoupled transfer functions and the control amplitudes needed

Homonuclear 13C decoupling in 13C nuclear magnetic resonance studies of biosynthesis using doubly labelled precursors. Assembly pattern of the acetate units in bikaverin

Abstract: In a 13C n.m.r. study of bikaverin biosynthesis by Fusarium oxysporum the use of (1,2-13C)-acetate and homonuclear 13C-decoupling overcame the difficulties of low 13C-enrichment, so that the polyacetate origin and the arrangement of precursor units in the metabolite could be established.

Generic solvability of Morgan's problem

Abstract: For m -input, m -output, linear time-invariant systems of the form \dot{x}(t)=Ax(t)+ Bu(t); y(t)= Cx(t) it is shown that Morgan's problem, (decoupling into an m -single input-single output subsystem) is solvable for almost all real matrix triples ( A,B,C ) consistently dimensioned.

Balanced differential capacitively decoupled charge sensor

Abstract: A balanced differential capacitively decoupled charge sensor for detecting small amounts of charge comprises balanced differential sensing means adapted to receive charge representing data and charge representing a reference value, a pair of capacitance decoupling transistors, the respective drains of each of said pair of capacitance decoupling transistors being electrically coupled to the respective inputs of said differential sensing means, a matched pair of charge output nodes electrically coupled to the respective sources of said capacitance decoupling transistors and adapted to receive, respectively, data charge and reference charge, and means for biasing and resetting both of said charge output nodes so that said capacitance decoupling transistors are functioning in a high transconductance mode when data charge and reference charge are received.

Compensated semiconductor ignition system for internal combustion engines

Abstract: To prevent spurious responses of a semiconductor switching element used in triggered magneto-type semiconductor ignition-switching systems, primarily due to noise signals introduced by the magneto, the control circuit for the ignition system includes a common, parallel connected R/C compensation circuit, connected through decoupling diodes to the ignition trigger pulse sources for the respective cylinders and the grounded main terminal of the switching element to supply a compensating voltage which suppresses noise voltages which increases with increasing speed of the internal combustion engine and thus dynamically compensates for generated noise pulses.

Sensitive decoupling control of linear disturbed-parameter systems

Abstract: The input-output decoupling control problem for a generalized multivariable linear model, covering most practical situations, is treated for the case where the model involves disturbances in the parameters. A sensitive decoupling controller is derived which maintains the decoupling conditions to first order in the parameter variations, about their nominal values.

Decoupling the transient dynamics of adjacent alternators

Abstract: The transient response of adjacent alternators is examined by means of multivariable control theory. A non-interactive controller is developed based on a linear system model which provides substantial decoupling together with improved transient stability. Examples of the use of the controller are given for both input power and excitation control applied to a simple representation of a three machine system.

Characteristics of duplex reinforcing elements with non-fracturing cores: simple theoretical analysis of core-sheath debonding

Abstract: Fracture of a reinforcing element of any length can be prevented by progressively decoupling the element from the rest of the composite structure as the tensile load carried by the element increases. The design and fabrication of one type of reinforcing element possessing such stress-controlled decoupling characteristics is described and its behaviour is compared with that predicted from simple theory over a wide range of conditions.

Studies on BHC isomers and related compounds. XIII. Syntheses and PMR studies of pentachlorocyclohexanecarbonitrile, pentachloromethylcyclohexane and tetrachlorodimethylcyclohexane.

Abstract: DL-(1245/36)*2-2, 3, 4, 5, 6-Pentachlorocyclohexanecarbonitrile was synthesized from (1234/56)-1, 4, 5, 6-tetrachloro-2, 3-epoxycyclohexane (α-BTC cis-epoxide). DL-(1245/36)-2, 3, 4, 5, 6-Pentachloro-1-methylcyclohexane was synthesized from the nitrile via DL-(1245/36)-2, 3, 4, 5, 6-pentachlorocyclohexylmethanol, the structure of which was confirmed by PMR spectroscopy using spin decoupling techniques and the shift reagent, Eu (DPM)3. This series of compounds was shown to have the same configuration as γ-BHC. The conformational equilibrium of these compounds is discussed. DL-(1245/36)-2, 3, 5, 6-Tetrachloro-1, 4-dimethyl-cyclohexane was synthesized by a stepwise route involving a Diels-Alder reaction of trans, trans-hexadiene-2, 4 with maleic anhydride.

Partial input/output decoupling in time-delay control systems

Abstract: The decoupling problem is considered for a class of multi-input multi-output time-delay systems, the parameters of which do not satisfy the conditions for total decoupling, i.e. the conditions for decouplin all input/output pairs. It is shown that in this case it is possible to decouple number of input/output pairs equal to the rank of the decoupling matrix. The partial decoupling procedure is illustrated by means of an example.

Uniform decoupling and stabilization by output feedback

Abstract: Attention is given to a class of time-varying multivariable systems which can be decoupled uniformly by state variable feedback. A procedure is developed that leads to a dynamic output feedback control law which simultaneously achieves uniform decoupling and stabilization in the augmented system.

Group decoupling theory for a generalized linear multivariable control system

Abstract: The problem of decoupling groups of inputs and outputs is unified and solved for a generalized multivariable linear control system involving most classes of linear systems, namely, time-invariant, time-varying, time-delay systems with derivatives in the input variables, systems in non-Markovian form, etc.

Support decoupled half-wave aerial for mobile equipment - uses quarter wavelength rod with ferromagnetic decoupling section serving as quarter wavelength aerial

Abstract: The antenna consisting of two radiation parts esp. for half wave aerials has a decoupling section against the aerial support such as a vehicle or a portable communication equipment and is for a frequency range of 80-500 MHz, pref. 146-174 MHz. The feeding point of the aerial is transferred from the middle of the aerial towards the support and is connected to the upper end of a short decoupling section of ferromagnetic material with the dielectrical constant approximately corresponding to the permeability. The length of the decoupling section is approximately equal to a quarter wavelength divided by the square root of the product of dielectrical constant and permeability. The ferromagnetic material may be either ferrite or carbonyl iron or a combination of both and may be in the form of a drilled out cylinder. The decoupling section consists of a coaxial cable section with threaded-on single hole cores of one or different ferromagnetic materials.

Bleachable filter for iodine laser emitting at λ=1.315 μ

Abstract: A bleachable dye was used in passive Q switching of an iodine laser (λ = 1.315 μ). The same dye could be used for optical decoupling of amplifying stages.

An apparatus for radio frequency trausmission for decoupling in an ins trument of nuclear magnetic resonance

Abstract: PURPOSE: An apparatus for radio frequency transmitting for decoupling in an instrument of nuclear magnetic resonance in which fine adjustment for transmitting frequency in a desired amount is easily attained. COPYRIGHT: (C)1976,JPO&Japio

Circuit for increasing the impedance of a winding wound around two cores made of soft magnetic material

Abstract: A principal winding is wound around two cores made of soft magnetic material. The principal winding has N turns. Wound around only one of the two cores is a magnetizing winding. A decoupling amplifier of gain v 1 energizes the magnetizing winding via the amplifier output, and the amplifier has an input across which is applied the voltage across the principal winding. The magnetizing winding has v 1 .N turns. If the principal winding and the magnetizing winding have the same winding direction, then the gain of the decoupling amplifier is chosen positive. If the principal winding and the magnetizing winding have opposite winding directions, then the gain of the decoupling amplifier is chosen negative.

Switching arrangement for direct voltage powered vehicle - has motor located in bridge diagonal of the semi-conductor valves

Abstract: The vehicle operates with a mixture of network and rheostatic braking The bridge comprises switch elements and partly controllable semiconductor valves The rheostatic braking is accomplished via a series arrangement connected to a diagonal point of the bridge and a braking resistance A part of this resistance is used for an auxiliary heater whereby this part is connected on one side via a decoupling diode between the actual resistance and the additional controllable valve and on the other side to a pole (+) of the direct voltage network A switch is located between the negative pole of the network and the resistance part and decoupling diode

A.C. supplied fluorescent lamps and supply cct. - cct. includes starting and brightness control using at least one starter

Abstract: Starter function is carried out by a switching network controlled by a device connected to it through a decoupling network with inputs connected to a terminal of the lamp heated electrode, whose other terminal is connected to a series inductance, connected in turn to a supply voltage terminal. The switching network output and the other supply voltage terminal are connected to the other electrodes. After the supply voltage has been applied and the lamp ignited for the first time, the gas discharge path is periodically disconnected for brightness control. When the lamps are periodically disconnected, their discharge paths are short-circuited through the decoupling network and the switching network, while heating current flows through the electrodes.

Decoupling device for amplifier outputs - has two inductances, magnetically coupled with each other, connected to two outputs

Abstract: Winding start of the first inductance, and winding finish of the second are connected to the amplifier output, and winding finish of the first inductance, and winding start of the second are connected through suitable resistors to the two decoupled outputs; capacitors are connected to the decoupled outputs for balancing their impedances. The invention ensures that a satisfactory decoupling, even with the higher frequencies, is provided. The apparent impedances of the outputs are easily balanced. Different loads, including open circuit and short circuit, on the one output cause no change in the gauge of the other.

Non-linear coupling in dynamic models of bi-state social interaction processes with time variable properties

Abstract: The problem of decoupling, crucial to the analysis of the differential equations governing the behaviour of bi-state social interaction processes with time dependent parameters, is investigated in this study. The feasibility of achieving the decoupling is demonstrated for classes of systems satisfying certain parametric constraints. These constraints are interpreted as certain physical properties, to be possessed by the bi-state social interaction process, which are sufficient for decoupling the given process into two independent processes.