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During recent years, the application of electronic devices to road vehicles has grown tremendously. Increased environmental concern and requirements on fuel economy, comfort and safety have created a need for compact and advanced micro-computer technology.
A vehicle is a problematic environment for electronic devices due to dust, damp, vibrations, noise and glitches.
This report
A method of resign for multivariable systems is presented. It is used in an application design of a controller for an advanced aircraft. The main design criteria, singular values plot, is discussed in detail. A must for the use of the method is that computer assistance is available. Two different interactive program packages allowing LQG-design are presented and somewhat compared.
The goal of this work is to build a dynamic model for a scalemodel of a process with coupled drives, using frequency and step-response analysis and to construct a regulator for this model. The scalemodel, constructed by the English company Tecquipment, is primarily intended for laboratory use by students.
The main problem is to reduce the interaction between the dynamics of the tension an
A self-tuning controller for frequency control of power systems by HVDC.
One of the advantages of High Voltage Direct Current, HVDC, is the possibility to control the power flow between different parts of an A.C. network. This property is being used when disturbances in the frequency, caused by load variations, is eliminated. Simulation studies on a physically scaled model of the "Go
Fermentation in a 5 l continuous flow reactor with immobilized yeastcells is controlled. Substrate concentration (sucrose) is continuosly measured with an enzyme thermistor. The control variable is flowrate through the reactor. The main controlproblem is a timelag in the measurementsignal. A bilinear processmodel is formulated and used for design of different controllers. Comparison is done betwee
A real-time kernel in Pascal for a Motorola MC 68000 mikroprocessor has been implemented to be used on ASEA's DS101 microcomputer system. An arbitrary number of processes can be executing concurrently. The following primitives for process synchronization are available. 1. Priority, 2. Semaphores, 3. Message passing, 4. Monitors, 5. Waittime, 6. Vectoried interrupt. The processes are realized a
The report presents a scheme for self-tuning regulators based on gradient methods. The feasibility of the scheme is studied in some special cases. The scheme is used together with different estimation techniques such as extended least squares (ELS) method and indirect estimation using a one to one correspondance with the regulator parameters. The method is illustrated using simulations of two diff
The programs are made to decide testing points in an integrated circuit. The measurements on the IC are performed in a SEM using digital electronbeamdeflection and digital secondary-electrondetection. A PDP11/23 computer and a QRGB-256 video-interface are used. Programs are written in MACRO-assembler and FORTRAN. Pictures may be taken up and stored on a mass storage (floppy-disk) for later retriev
