This thesis aims to cover some aspects of synthesis and design of Proportional- Integral-Derivative (PID) controllers. The topics include computer aided design of discrete time controllers, data-based design of discrete PID controllers and data- robust design of PID controllers. These topics are of paramount in control systems literature where a lot of stress is laid upon identification of plant and robust design. The computer aided design of discrete time controllers introduces a Graphical User Interface (GUI) based software. The controllers are: Proportional (P), Proportional-Derivative (PD),Proportional-Integral (PI) and Proportional-Integral- Derivative (PID) controllers. Different performance based design methods with these controllers have been introduced. The user can either explore the performance by interactively choosing controllers one by one from the entire set and visualizing its performance or specify some performance constraints and obtaining the resulting set. In data-based design, the thesis presents a way of designing PID controllers based on input-output data. Thus, the intermediate step of identification of model from data is removed, saving considerable effort. Moreover, the data required is step response data which is easier to obtain in case of discrete time system than frequency response data. Further, a GUI developed for interactive design is also described. In data-robust design, the problem of uncertainty in data is explored. The design method developed finds the stabilizing set which can robustly stabilize the plant with uncertainty. It has been put forward as an application to interval linear programming. The main results of this research include a new way of designing discrete time PID controllers directly from the data. The simulations further confirm the results. Robust design of PID controllers with data uncertainty has also been established. Additionally, as a part of this research, a GUI based software has been developed which is expected to be very beneficial to the designers in manufacturing, aerospace and petrochemical industries. PID controllers are widely used in the industry. Any progress in this field is well acknowledged both in the industry and the academia alike. This thesis attempts a small step further in this direction.

Thesis (M.S.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains ix, 51 p. : ill. Includes abstract. Includes bibliographical references (p. 46-51).

Thesis (Ph. D.)--University of Hong Kong, 2002. / Includes bibliographical references (leaves 122-132).

Discrete-event simulation appears to be an ideal candidate for parallel processing not only because many large-scale simulations take extremely long execution times on conventional computers but also because the systems being modelled often contain considerable amounts of intrinsic parallelism. Ability to simulate large models in a reasonable time is the motivation for seeking speed advantages offered by parallel computer systems. The Connection Machine is an example of a massively parallel computer with a general communications network in which any processor can communicate with any other that is well suited for the DEVS (Discrete Event System Specification) broadcast models simulation. However, a new approach is required to mapping the DEVS abstract simulator onto a SIMD architecture such as that of the Connection Machine CM-2. This dissertation extends the DEVS formalism to allow the exploitation of data parallelism afforded by a massively parallel SIMD architecture. A broadcast model simulation environment is implemented in *Lisp on the Connection Machine CM-2. Two examples of parallel processor models are presented for demonstration. Several runs are made on the implementation using the Parallel Processor Broadcast Architecture model. The experimental results are compared to those from DEVS-Scheme running on sequential machines such as the Sun-4 workstation and the Motorola Delta 88K MultiPersonal Computer using the same model. The results show that simulations on the CM-2 are approximately 150 times faster. In addition, to get some insight on the effect of increasing the number of processors of a SIMD architecture (i.e., the size of the broadcast model simulated), runs were made to measure the execution times. The execution results confirm our analysis pointing to imitations in the SIMD architecture for exploiting DEVS internal event parallelism.

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This project has proved conclusively that discrete event simulation techniques can be used to simulate, on computer, a complex stochastic materials handling system. The packing, automatic palletising and warehousing departments of a large powders manufacturing factory was used as an example to investigate the capabilities of computer simulation. The company intends to increase the number of packing machines from seven to eleven, and has embarked on productivity improvement projects that aims to increase the average packing efficiency from the current 50%, to 60% with a long term goal of 70%. Due to the stochastic nature of the run and stop durations of the packing machines, it was impossible to predict the effect of the increased throughput on the palletising system by conventional means. The system was modelled on computer using the SIMAN simulation language. Extensive research was initially carried out in order to determine the operating parameters of the system. The generation of cases from the packing machines in the program was verified against actual production runs. Various alternatives were analyzed to assist in decision making on the expansion of the palletising system in order to accommodate the increased throughput expected from the packing floor. The simulation was therefore used to increase the capacity of the automatic palletising system at minimal cost while meeting demands from the packing floor. It was established that the only capital expenditure required would be about R500 000 to increase the capacity of a palletiser and to provide a pallet conveyor to transport 40% of the pallets to direct despatch. / Thesis (M.Eng.)-University of Durban-Westville, 1989.

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