Multimicroprocessor System Research Articles

交流‐直流電気推進システムのシミュレーション ＩＩ

The block diagram of experimental ac-dc electric propulsion system is obtained containing detailed chopper switching phenomena on the chopper controlled motor which drives the alternator. Dynamic performance of experimental system on crash astern, assuming that ship speed is constant, is estimated by the MISS simulator managed on the multi-microprocessor system. The computed results using observed constants match those obtained from the tests. It is discussed on the analytical response of velocity and shaft torque of the propeller affected by the values of current limit of the propulsion motor, field time constant of the generator and integral gain of the automatic voltage regulator.

Dual model reference adaptive control on paper machine headboxes

When industrial processes operate under variable production conditions, linear models and linear controllers are generally not efficient. When a paper machine operates at variable speed, the control of the headbox must be efficient for large operating point transitions.We present a dual model reference adaptive controller (DMRAC) that allows the control of linear time varying systems and the explicit on line identification of the process with delayed inputs.The application of the DMRAC to a pressurized headbox when large operating point transitions are applied is presented. Finally a functional decomposition of the DMRAC algorithm for its implementation in a multi-microprocessor system is presented.

Dual Model Reference Adaptive Control on Paper Machine Headboxes

When industrial processes operate under variable production conditions, linear models and linear controllers are generally not efficient. When a paper machine operates at variable speed, the control of the headbox must be efficient for large operating point transitions.We present a dual model reference adaptive controller (DMRAC) that allows the control of linear time varying systems and the explicit on line identification of the process with delayed inputs.The application of the DMRAC to a pressurized headbox when large operating point transitions are applied is presented. Finally a functional decomposition of the DMRAC algorithm for its implementation in a multi-microprocessor system is presented.

Use of Microprocessors in Plastics Research

The application of microprocessors to routine repetitive experiments in Polymer Technology is discussed. The criteria to be considered in system design are defined. The use of microprocessors has enabled many tests to be automated and more data to be collected from each sample. Computer control of Gel Permeation Chromatographs and Vicats has enabled the equipment to run continuously allowing an increased through-put of samples and a reduction in the amount of labour required. Extruder control equipment is described that utilises a multi microprocessor system with large capacity Read Only Memories to reduce the software complexity in a real time control system.

Use of microprocessors in plastics research

The application of microprocessors to routine repetitive experiments in Polymer Technology is discussed. The criteria to be considered in system design are defined. The use of microprocessors has enabled many tests to be automated and more data to be collected from each sample. Computer control of Gel Permeation Chromatographs and Vicats has enabled the equipment to run continuously allowing an increased through-put of samples and a reduction in the amount of labour required. Extruder control equipment is described that utilises a multi microprocessor system with large capacity Read Only Memories to reduce the software complexity in a real time control system.

Software for CYBA-M

This article outlines the software which has been designed and implemented for the multimicroprocessor system CYBA-M. This software includes a language involving concurrency and parallelism in which to write application programs, CYBA-L, together with the means of translating programs in this language into executable form on CYBA-M. The objectives of this software were to provide an easily modifiable system for research purposes with the minimum of manpower.

Replacement of computer bureaux

The flexibility of microprocessor system construction makes it inevitable that groups of microprocessors will form large scale computing devices emulating existing multiprocessor systems such as those used in computer bureaux. It is shown that it appears straightforward to set up a multimicroprocessor system to act as a time sharing or batch processing bureau. The shortage of software for microprocessor systems, compared to that available for existing bureaux, is the main obstacle to such a development.

A multi-microprocessor system for parallel computations

This paper is concerned with the design of a multi-microprocessor system that exploits parallelism in ordinary high-level language programs so as to increase their execution speed, without adding too much complexity to the system. The notion of Parallel Execution Strings (PES) as a representation of expressions for parallel execution is first discussed. We then apply the PES scheme to detect the parallelism at both the statement and the block levels. Finally, the design of a multi-microprocessor system suitable for executing the programs compiled with the PES notion is presented. It consists of a number of microprocessors (Am2900) with central control of moderate complexity.

A multi-microprocessor system for finite element structural analysis

During the last few years, advances in microprocessor technology have spurred a renewed interest in special-purpose computers. The microprocessor has become small, inexpensive, and powerful enough to be considered as a building block for special-purpose hardware. A description is presented of the architecture of a prototype 'finite element machine' currently being built. Attention is given to details regarding the finite element analysis problem, the arrangement of the processors as finite element nodes in the structural model, the influence of the architecture on the solution algorithm, interprocessor communication primitives, and the performance of the finite element machine.

An experimental multimicroprocessor system with improved internal communication facilities

The points to be considered for the design of the internal communication network in a multi-processor system are: a) overall throughput; b) fault tolerance; and c) ease of implementation. Paying attention to these goals, this paper proposes an architecture where processors are tightly grouped in clusters, loosely linked to each other. The internal communications are carried out on over at least two functional levels: a parallel bus and a set of serial links. An experimental machine (μ ∗) that implements the architecture with available microprocessors is described. The complete modularity based on a standard bus structure (MUBUS) allows easy reconfiguration and expansion, and the whole structure is compatible with VLSI implementations of the processor modules.

Multi-level self-diagnosis and fault tolerance in a multimicroprocessor system : R. Negrini and M. G. Sami. Alta Freq.XLVII, (7) 557 (1978)

Multi-level self-diagnosis and fault tolerance in a multimicroprocessor system : R. Negrini and M. G. Sami. Alta Freq.XLVII, (7) 557 (1978)

Automatic Control of a Four Stands Cold Rolling-Mill with a Multi-Microprocessor System

The paper deals with the practical implementation of a multi-microprocessor system for the automatic control of a four stands cold rolling-mill.The problem is a typical one that would be very hard to solve with conventional equipment; however it is too limited in size to justify investing in a minicomputer.The recent advent of microprocessors has provided the control engineer with a new tool that seems to be well suited to this kind of problem.In the paper, we analyse the practical, technical and economical aspects of using a microprocessor-based control system in this area.

A realization of a DDA system for continuous dynamical system simulation with a universal multimicroprocessor system “HARPS”

A DDA system for simulation of continuous dynamical system is realized with a universal multimicroprocessor system “HARPS”. This DDA system is intended to be an on-line real time simulator being capable of interactive use. It has a hierarchical control structure which can efficiently control the system of a number of processors working in parallel formation in the DDA. It also has a memory and bus structure which provides the stored interconnection scheme for making users free from tedious patching efforts. This report presents the outline of the realized DDA system. It also presents a discussion on the experimental results.

SMS 101 — A structured multimicroprocessor system with deadlock-free operation scheme

The presented multimicroprocessor system has been designed to treat certain problem classes such as large systems of differential equations or online process control. It consists of a main processor and an arbitrary number of modules, each with a microprocessor, a private memory and a communication memory. The most characteristic features of the SMS 101 organization are • - a phase structured interaction scheme (PSI- Scheme) which simplifies organizational problems • - a data communication concept, that replaces common memory by simultaneously storing data in distributed memories. A first realization of the system comprises 8 modules, but the organization allows an extension up to several hundreds of modules. Thus with present day technology a computing capacity can be achieved which is 2 or 3 magnitudes higher than that of conventional computers.

SMS 101 - A structuredmultimicroprocessor system with deadlock-free operation scheme

The presented multimicroprocessor system has been designed to treat certain problem classes such as large systems of differential equations or online process control. It consists of a main processor and an arbitrary number of modules, each with a microprocessor, a private memory and a communication memory. The most characteristic features of the SMS 101 organization are: - a phase structured interaction scheme (PSI-Scheme) which simplifies organizational problems - a data communication concept, that replaces common memory by simultaneously storing data in distributed memories. A first realization of the system comprises eight modules, but the organization allows an extension up to several hundreds of modules. Thus with present day technology a computing capacity can be achieved which is 2 or 3 magnitudes higher than that of conventional computers.

The communicateur: A multi microprocessors simulation tool.

A specialized mechanism permitting asynchronous and simultaneous communications not only among active partners (such as microprocessors) but also with passive partners (such as storages or passive resources) is proposed. A prototype of this mechanism using several minicomputers to emulate different kinds of microprocessors is described. The purpose of this prototype is the simulation of the communication in a distributed multi-microprocessor system.