DOI:10.1049/ree.1972.0001

出版商:IERE    

年代:1972

数据来源: IET

摘要:

A theory is presented for analytically relating frequency domain criteria to time domain performance criteria. Third-order models are shown to adequately predict dynamic errors in a wide variety of high order physical systems with bandwidths differing by more than 100 to 1. Model coefficients lie in a relatively small region of the coefficient plane, suggesting that check-out spot frequencies and tolerances previously established empirically may be of general use.Good agreement is observed between predictions based on design data and experimental frequency response results obtained under field conditions on tolerancing an electro-hydraulic servo to satisfy dynamic error constraints on time domain inputs. When used in reverse, the technique predicts system filter properties from time domain measurements. Results are applicable to both manual and automatic test procedures.The general form of low-order model permits a reasonable approximation to frequency domain tolerances by inspection, reducing costly development and field tests.

DOI:10.1049/ree.1972.0002

出版商:IERE    

年代:1972

数据来源: IET

摘要:

Numerical computation of the coordinates of the circle points needed is based on simple incremental algorithms. The organization of the special-purpose computer is described. A major advantage over the analogue methods commonly used is the accuracy and the stability of the pattern.

DOI:10.1049/ree.1972.0003

出版商:IERE    

年代:1972

数据来源: IET

摘要:

The process of mapping Boolean functions is generalized from the Karnaugh map, and it is shown that there are eight useful maps corresponding to any function, from which eight two-layer networks may be derived for implementation of the function. Applications to e.c.l. and m.o.s. logic are mentioned.

DOI:10.1049/ree.1972.0004

出版商:IERE    

年代:1972

数据来源: IET

摘要:

Manned mechanical handling is gradually being augmented by automatic systems, and it is appropriate to review manufacturing processes in this connexion. The principles and use of linear and rotary electromagnetically-coupled measurement transducers giving the required information in the form of a change of phase of an electrical signal are discussed. The extent to which transducers can be used as the basis of automatic systems for point-to-point transportation as, for example, in automatic warehousing is described.

DOI:10.1049/ree.1972.0006

出版商:IERE    

年代:1972

数据来源: IET

摘要:

Linear time-varying analysis for single-balanced diode mixers and modulators is developed to incorporate a non-linear conductance model of the non-linear elements employing the exponential i/v characteristic and series resistance of a typical Schottky-barrier diode. It is shown that over a significant range of local-oscillator drive conditions calculations based on the much simpler bilinear diode model can be expected to yield predictions of loss and matching conditions which closely approach those obtained from the more sophisticated calculations. However, in operating conditions involving the use of d.c. bias voltages approaching the peak local-oscillator voltage, as is necessary for the achievement of low loss in certain double-tuned circuits, significant departures occur resulting in failure of the ‘duality’ relationships existing between series and shunt configurations. The series circuit is shown to be theoretically capable of superior loss performance to the shunt, but under terminating conditions which will be difficult to realize in practice.

DOI:10.1049/ree.1972.0007

出版商:IERE    

年代:1972

数据来源: IET

摘要:

The paper gives a qualitative treatment of a novel approach to the production of sequential control systems for mechanical handling devices. A proposition that complex sequences can be broken down into combinations of four standard sequence packages is justified and methods are evolved for interconnecting these standard-sequence packages to form complete systems. Additional benefit in the form of freedom from electrical interference is gained by using the machine actuators alone as memory devices.

DOI:10.1049/ree.1972.0008

出版商:IERE    

年代:1972

数据来源: IET