/pdf/a-new-approach-to-linear-filtering-and-prediction-problems-1f1lkk9j5b.pdf

A New Approach to Linear Filtering and Prediction Problems

Time-delay systems: an overview of some recent advances and open problems

A method of measuring eye movements using a scleral search coil in a magnetic field

https://lup.lub.lu.se/search/ws/files/6340936/8509157.pdf

Paper: Automatic tuning of simple regulators with specifications on phase and amplitude margins

With the subject exposed to an alternating magnetic field, eye position may be accurately recorded from the voltage generated in a coil of wire embedded in a scleral contact lens worn by the subject. Using two magnetic fields in quadrature phase and two coils on the lens, one may measure horizontal, vertical and torsional eye movements simultaneously. The instrument described has an accuracy and linearity of about 2 per cent of full scale, a resolution of 15 seconds of arc and a bandwidth of 1000 cyles per second.

A Method of Measuring Eye Movemnent Using a Scieral Search Coil in a Magnetic Field

Feedback Control Systems

A novel method is presented for producing dead-bea response in a lightly-damped oscillatory feedback system. Complete transient response times of the order of a fraction of the natural oscillatory period can be obtained. Excellent waveshape reproduction is achieved through a linear phase lag with frequency. The method consists of exciting several transient oscillations, at closely spaced times, with magnitudes and phases so adjusted that the resultant sum of the transient oscillation phasors is zero. The steady-state output is the arithmetic sum of the excitation magnitudes. When a step input transient is divided into two spaced excitations, one-half cycle response is obtainable. When the input transient is divided into three excitations, one-fourth period or faster transient times are realizable, depending upon the available dynamic range or signal-to-noise ratio. The principle of design is to adjust a system to the maximum possible resonant frequency, independent of the damping factor, but stable, and then to apply the Posicast control to completely remove the oscillatory component in the output. In an electrical feedback control system, the additional hardware consists of one or two artificial transmission lines.

Posicast Control of Damped Oscillatory Systems

The flow function of a power system is the vector of node powers expressed in terms of the node angles The Jacobian is the matrix of partial derivatives of the flow vector with respect to the angle vector The ratio of the determinant of the Jacobian to the value which it has when the node angles are set to zero is a dimensionless stability margin which lies between one and zero (steady-state in- stability) and is easily computed from a load flow The margin of torque is the least change in power flows that will cause instability Maximizing the torque margin or maximizing the stability margin with a load constraint yields the optimum dispatching change to maximize security

Equilibrium Analysis of Power Systems

A solar collector system uses a hexagonal field module of heliostatic mirrors with each heat receptor tower being located outside of its associated module Each mirror includes a reflecting film held down electrostatically (for easy replacement) and protected by wind guards

Solar collector system

The evaluation of the stability of a power system during a transient requires that the dynamics of the subsystems be decomposed into relative and collective motions. This decomposition must establish a distinction between synchronous and frequency equilibria. Such a decomposition is made possible by specifying a system center of angle which is defined as the inertia weighted average of all rotor angles. The angular velocity of the center of angle accurately describes the frequency of the system. An angular coordinate of each rotating element in the system can be specified relative to the center of angle. In terms of these coordinates a simple expression is obtained for the exact transient kinetic energy of the system. A transformation relating center of angle referenced variables to the usual one machine reference allows the simultaneous use of both references each where best suited.

Otto J. M. Smith

Papers

Feedback Control Systems

Posicast Control of Damped Oscillatory Systems

Equilibrium Analysis of Power Systems

Solar collector system

Characterization of Equilibrium and Stability in Power Systems