Transactions of the Institute of Measurement and Control

John Hill, R.; Luo, Fang L.

doi: 10.1177/014233129001200101pmid: N/A

A four-quadrant AC-fed converter for a DC machine drive using a single bridge thyristor fully controlled rectifier with GTO (gate turn-off) thyristor zero-current reversing switch is described. The circuit has the advantages of no circulating currents and very short current commutation time. Microprocessor-based control techniques are described which achieve optimum transient operation of the converter.

Whalley, R.

doi: 10.1177/014233129001200102pmid: N/A

This paper is focused on relative stability tests and their use in the design and analysis of multi-dimensional dynamical systems. General results are outlined, and specific examples dealing with the graphical procedures enabling two-dimensional sample data system analysis are presented.

Forsythe, W.

doi: 10.1177/014233129001200103pmid: N/A

Considering first a 2-square plant, it is shown how the elements of the compensating matrices may be chosen in a simple manner to create a non-interacting system with desirable dynamic properties; the results are then gereralised to show that the same scheme, with little alteration, can be used on the general n-square system.

Masding, P.W.; Bumby, J.R.

doi: 10.1177/014233129001200104pmid: N/A

This paper, and its companion Part II, describes the modelling and simulation of the drivetrain components in a hybrid i. c. -enginelbattery electric car. In this part particular attention is paid to describing the hybrid drive system and the identification procedure used to obtain discrete z-transfer functions of the system components. A full physical analysis of the i.c. engine is described and used, along with the identification procedure, to identify discrete transfer functions relating engine torque and speed to accelerator demand. A comparison of experimental and simulated data confirms the validity of the identified transfer functions. With these transfer functions, and those produced in the companion paper for the electric traction system, it is possible to design a main hybrid vehicle control unit which can both schedule, and control, the torque from either, or both, the i. c. engine and the electric traction motor in a smooth manner.

Malešev, Milutin

doi: 10.1177/014233129001200105pmid: N/A

This paper proposes the new method for determining the random error in measuring the complex S-parameters- elliptic error. The measurements on two antennas making a two-port network were carried out and the elliptic error was calculated in parameters S21 for σ p, 2σp and 3σp.

Bosman, D.; Bakker, W.

doi: 10.1177/014233129001200106pmid: N/A

Task-dependent response - eg, in instrument calibration, spatial positioning and the like - is a long nursed requirement: transition to the end state very fast, albeit imprecise, followed by slower but very accurate final action. The realisation, of course, is a non-linear filter which can take many levels of refinement. In this paper the analysis is presented of the most simple continuous type and it is shown that signal-dependent overshoot (associated with fast response) can be obtained using networks with strictly low-pass (non-negative) impulse response.

Daizhan Cheng, ; Shuqing Huang, ; Lee, Won-Kyoo; Jiangbo Liu,

doi: 10.1177/014233129001200107pmid: N/A

In this paper the problem of full linearisation, which means linearising the state and output equations simultaneously, is tackled. First we present necessary and sufficient conditions for the full linearisation of a class of non-linear systems; then a method to design a closed-loop observer for linearised system is presented. Finally, the developed technique is used to investigate the control of an activated-sludge process. Some simulation results are given.