Showing papers on "Decoupling (electronics) published in 1984"

Possible causes and consequences of upper mantle decoupling and ophiolite displacement

Abstract: Summary The possible causes and consequences of tectonic decoupling within the oceanic upper mantle and the subsequent displacement of ophiolites are considered with specific reference to the petrology, chemistry and structure of the basal mantle tectonites of ophiolites and their metamorphic soles. Investigations of the basal peridotites provide information on high temperature-high pressure events that have occurred in the upper mantle and on its mechanical properties at depths <15 km, while metamorphic soles reveal the pressure-temperature regimes operating during and as a direct result of overthrusting. Currently available age data from several well-documented ophiolites reveal that ophiolite igneous crystallization and basal metamorphism are broadly contemporaneous, in keeping with the localized occurrence of granulite-facies sole assemblages. Theories on the formation of sub-ophiolite metamorphic rocks are reviewed and the process of ophiolite inception is reappraised. It is concluded that many ophiolites are tectonically decoupled along the lithosphere-asthenosphere boundary and initially displaced as complete slices of hot, thin, immature lithosphere in close proximity to spreading centres.

Decoupling of a Two-Axis Robotic Manipulator Using Nonlinear State Feedback: A Case Study

Abstract: A case study that illustrates the use of nonlinear state feed back to decouple the control of a two-axis polar-coordinate robotic manipulator is presented. One type of position cou pling and two types of velocity coupling are investigated. In each case, the application of decoupling compensation results in marked improvement in the performance of the robotic arm. The implementation difficulties associated with apply ing a nonlinear state-feedback control law to an inexpensive, indirect-drive robotic arm, using a microcomputer controller and low-resolution sensors, are examined.

Coupling/decoupling capacitor multiplier

Abstract: The invention discloses an improved capacitor multiplier which can be applied in both floating coupling and in grounded decoupling applications.

Device for connecting a hydraulic clamping device arranged on a work pallet

Abstract: The invention relates to a coupling system for coupling pressurised hydraulic systems to the supply of hydraulic fluid In this arrangement, the coupling and decoupling movement is effected via a hydraulic control piston which is acted upon by the very hydraulic fluid which is to be passed via the coupling The feed and return of the hydraulic fluid to the coupling is controlled in the manner of a spool control by the coupling and decoupling movement of the coupling Applications: work pallets with a hydraulic clamping device

Preparation and placing of coaxial piezoelectric sensors in a roadway

Abstract: Piezoelectric sensor for the dynamic weighing and detection of vehicles on a roadway. The sensor is integral with a metal frame which is symmetric with respect to its axis and placed in a trench perpendicular to the traffic flow direction. The trench is filled with a material allowing as great a mechanical decoupling as possible between the sensor and the roadway.

Heated-window antenna

Abstract: A heated-window antenna is proposed by means of which the reception of long, medium and short-wave band transmissions is improved. The heated-window antenna comprises a heating-conductor arrangement (11) which is connected to a battery (23) via a decoupling circuit (30). The decoupling circuit has a high-permeability core (24) with two coils (18, 20) which have a low resistance and a very high impedance for radio-frequency current. A third coil (25) which is wound on the core is used for extraction of the radio-frequency signal voltage. The second and third coils (20, 25) are preferably connected as an autotransformer.

Keyswitch with decoupling diode

Abstract: A keyswitch for use with keyboards for connecting intersecting row and column wires of a circuit board for the keyboard has a decoupling diode for preventing the generation of false signals which may prevent a clear identification of the keyswitch which has been activated upon the simultaneous actuation of several keyswitches. The decoupling diode is integrated in the movable contact bridge of the keyswitch so that no soldering need be undertaken on the circuit board for the keyboard.

Input circuit for television receiver

Abstract: An input circuit is provided for a television receiver for amplifying and transforming the input signals into an intermediate frequency signal. The output of the mixers is fed via intermediate-frequency bandpass filters to respective decoupling diodes, which are switched on depending on the selected receiver frequency range. The output of the decoupling diodes is fed to an impedance transformer such as an emitter follower and its output in turn is entered into an intermediate-frequency amplifier.

A new IP decoupling scheme

Abstract: In each small range of frequency, most IP phase spectra can be represented by a linear function of the logarithm of frequency, and most inductive coupling phase spectra can be represented by a few terms in a power series in frequency. Here some new two- or three-frequency decoupling techniques are developed. They are simple and effective, and can give approximate IP phase spectral behaviour which is helpful to field data interpretation. Therefore they can be used in practice to replace the older linear or quadratic phase fitting techniques. A three-frequency smoothing technique is suggested, which can be used to decrease the effect of stochastic noise and survey error during decoupling.

Fuel injection device

Abstract: In a fuel injection device with at least one injection valve (10), with a fuel accumulator (14) under high pressure and with a metering valve (16) connected to the fuel accumulator (14), which valve during its opening phase feeds a metering pulse measuring the fuel injection quantity into a pressure line (21) leading to the injection valve (10), the pressure line (21), for the purpose of decoupling the metering process from the injection process, is designed as a decoupling line decoupling the metering pulses from pressure waves reflected on the injection valve (10). The length of the decoupling line is at the same time designed greater than half the product of the speed of sound in the fuel multiplied by the opening time of the metering valve (16) required for metering of the maximum fuel injection quantity.

Device for transmitting information via supply lines

Abstract: The invention relates to a device for transmitting information via supply lines in the case of battery-operated vehicles which are connected to a supply point (docked), in order to charge the batteries. The measurements for the terminal voltage of the batteries are coupled in on the vehicle side on the incoming and outgoing lead for the charging current, via coupling elements, are coupled out on the side of the stationary charging apparatus and are supplied to the charging apparatus as control signals for the battery charging current. The information can be converted into radio-frequency signals by means of a voltage/frequency converter and can be coupled in or out on the supply lead, via coupling capacitors. Decoupling elements can be provided between the battery and the coupling-in point on the vehicle side and between the charging apparatus and the stationary coupling-out point. The device according to the invention allows the charging current of the batteries to be regulated in an optimum manner. The sliding contacts on a supply point for the transmission of the terminal voltage can be dispensed with.

A precompensator design to achieve the decoupling condition in the frequency domain

Abstract: This paper deals with the problem of designing a precompensator, by using the frequency domain approach, for linear systems having weak inherent coupling such that the composite system will be decouplable through linear state variable feedback (l.s.v.f.) alone. Three algorithms are presented for such a purpose. The first one makes use of a new theorem for dynamic decoupling through l.s.v.f. alone, while the other two make use of the interactor concept. The algorithms always yield stable precompensators. Moreover, the controllability and observability of the composite system are guaranteed.

Nuclear magnetic 13C19F double resonance: Fluorine broad band decoupling

Abstract: The feasibility of broad band fluorine decoupling for 13C NMR spectroscopy, employing a new composite pulse sequence, is shown. The application of this sequence allows the decoupling of fluorine nuclei over almost the total range of chemical shifts in fluoroorganic compounds, at magnetic fields of up to 2.3 T, without extensive demands on the decoupler power amplifier. The range of expected chemical shifts of fluorine bonded to carbons is briefly discussed.

Protection device against the perturbations and/or interferences in the vicinity of integrated circuits

Abstract: The device is aimed at providing integrated circuits with efficient shielding against electromagnetic perturbation while producing effective decoupling from the power supply. The device consists of a component forming a capacitor integrated directly with the housing of the integrated circuit. The component consists of two parallel plane conductors each having a surface area substantially equal to that of the main surface of the integrated circuit. Each plane conductor is connected electrically to the corresponding power supply terminal pin of the integrated circuit. The two plane conductors are separated by a dielectric element. The device can equally well be used for integrated circuit supports as for the integrated circuits themselves.

Decoupling apparatus for an aerial array

Abstract: Attenuating apparatus is provided for reducing disturbance between transmitting and receiving aerials mounted vertically one above the other. Attenuation is achieved with the aid of an earthed screen (1) and a spacer, both mounted between the aerials. The screen is provided with cutouts (6) having a longest pitch (c) of λ/2, where λ is the means frequency of the pertinent frequency band and λ/4 is the depth (d) of the cutouts. The lengt of the spacer is 0.70λ.

Decoupling of secondary systems for seismic analysis

Abstract: Interest in the decoupling of such secondary systems as floor-mounted equipment centers on two decoupled models, the ''cascading'' model and the ''lumped'' model. A set of decoupling criteria is derived which addresses both models. The solution is based on the two-degree-of-freedom system. Error in predicted frequency given by each decoupled model is presented. Similar results for response error are derived based on broad-band input to the supporting system. The broad-band input would be applicable to subsystems supported by primary structures. Recommendations are made for extension of the problem to arbitrary multiple-degree-of-freedom systems. The findings of this study will provide the analyst with the information necessary to choose the best decoupled model and will indicate whether decoupling should be attempted.

Circuit arrangement for controlling the commutation in a stepping motor

Abstract: In a circuit arrangement for controlling the commutation of a stepping motor, each phase winding (1) of which is connected to the detector diagonal of a bridge circuit consisting of four switching transistors (2, 3, 4, 5), a capacitor (17) is connected across each phase winding (1) and a decoupling diode (13, 14) is included in each of two arms of the bridge circuit. In case of a bridge circuit comprising complementary transistors (2, 4; 3, 5), whose emitters are connected to the terminals (6, 7) of the supply voltage (Uo) and whose collectors are interconnected in pairs, the decoupling diodes (13, 14) are included in the collector leads of the transistors (2, 4) of one type of conductivity, and protective diodes (15, 16) are connected in parallel to the collector-emitter path of the transistors (3, 5) of the other type of conductivity.

Speed control of an ac motor by state variables feedback with decoupling

Abstract: The use of a state variables feed-back current regulator working in a coordinate system turning with the synchronous field and oriented on the rotor flux allows to obtain a complete decoupling between the two stator current components control circuits and a dynamic behaviour independent of the working point A state regulator of the speed with a load torque observer is superposed on the current control circuits An application with a 1 kW squirel asynchronous machine fed by a transistors inverter shows that, with this control method, the asynchronous machine has a dynamic behaviour quite comparable with the DC motor one

Detachable connecting arrangement for at least two optical fibres

Abstract: The invention relates to a cost-effective detachable connecting arrangement for optical fibres, which is particularly suitable for occasional coupling and/or decoupling. This operation requires no tools, nor any adjusting operations.