Wyniki wyszukiwania - BazTech

1

Automation design for monorail - based system processes

Besa B., Chanda K. E., Kuruppu M.

Transport Problems

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2016

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T. 11, z. 4

29--41

EN

Currently, conventional methods of decline development put enormous cost pressure on the profitability of mining operations. This is the case with narrow vein ore bodies where current methods and mine design of decline development may be too expensive to support economic extraction of the ore. According to studies, the time it takes to drill, clean and blast an end in conventional decline development can be up to 224 minutes. This is because once an end is blasted, cleaning should first be completed before drilling can commence, resulting in low advance rates per shift. Improvements in advance rates during decline development can be achieved by application of the Electric Monorail Transport System (EMTS) based drilling system. The system consists of the drilling and loading components that use monorail technology to drill and clean the face during decline development. The two systems work simultaneously at the face in such a way that as the top part of the face is being drilled the pneumatic loading system cleans the face. However, to improve the efficiency of the two systems, critical processes performed by the two systems during mining operations must be automated. Automation increases safety and productivity, reduces operator fatigue and also reduces the labour costs of the system. The aim of this paper is, therefore, to describe automation designs of the two processes performed by the monorail drilling and loading systems during operations. During automation design, critical processes performed by the two systems and control requirements necessary to allow the two systems execute such processes automatically have also been identified.

DE

Derzeit haben konventionelle Methoden der Abnahme Entwicklung enormen Kostendruck auf die Rentabilität der Bergbau. Dies ist der Fall mit engen Vene Erzkörper, wo aktuelle Methoden und Mine Design der Entwicklung des Rückgangs kann zu teuer sein, um die wirtschaftliche Extraktion des Erzes zu unterstützen. Studien zufolge kann die Zeit, die zum Bohren, Reinigen und Sprengen eines Endes in einer konventionellen Abnahmeentwicklung benötigt wird, bis zu 224 Minuten dauern. Dies liegt daran, dass, sobald ein Ende gestrahlt wird, sollte die Reinigung zuerst abgeschlossen werden, bevor das Bohren beginnen kann, was zu niedrigen Vorschüben pro Schicht. Verbesserungen bei den Fortschrittsraten bei der Entwicklung des Rückgangs können durch die Anwendung des Elektrohängebahn-systems (EMTS) erreicht werden. Das System besteht aus den Bohr-und Beschickung Komponenten, die Monorail-Technologie zu bohren und zu reinigen das Gesicht bei der Entwicklung des Rückgangs. Die beiden Systeme arbeiten gleichzeitig am Gesichtsfeld so, dass das pneumatische Ladensystem bei der Bohrung des Oberteils des Gesichts das Gesicht reinigt. Um jedoch die Effizienz der beiden Systeme zu verbessern, müssen kritische Prozesse, die von den beiden Systemen im Bergbau durchgeführt werden, automatisiert werden. Die Automatisierung steigert die Sicherheit und Produktivität, reduziert die Ermüdung des Bedienpersonals und reduziert gleichzeitig die Arbeitskosten des Systems. Das Ziel dieser Arbeit ist es daher, Automatisierungskonzepte der beiden Prozesse zu beschreiben, die von den Monorail-Bohr- und Beschickungssystemen während des Betriebs durchgeführt werden. Während des Automatisierungsentwurfs wurden auch kritische Prozesse identifiziert, die von den beiden Systemen durchgeführt wurden, und Kontrollanforderungen, die erforderlich sind, damit die beiden Systeme solche Prozesse automatisch ausführen können.

2

Stabilization of Inertial Plant with Time Delay Using Fractional Order Controller

Ruszewski A., Nartowicz T.

Acta Mechanica et Automatica

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2011

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Vol. 5, no. 2

117-121

EN

The paper presents the problem of designing of a fractional order controller satisfying the conditions of gain and phase margins of the closed-loop system with time-delay inertial plant. The transfer function of the controller follows directly from the use of Bode's ideal transfer function as a reference transfer function for the open loop system. Using the classical D-partition method and the gain-phase margin tester, a simple computational method for determining stability regions in the controller parameters plane is given. An efficient analytical procedure to obtain controller parameter values for specified gain and phase margin requirements is also given. The considerations are illustrated by numerical examples computed in MATLAB/Simulink.

3

Active fault diagnosis based on stochastic tests

Poulsen N. K., Niemann H.

International Journal of Applied Mathematics and Computer Science

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2008

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Vol. 18, no 4

487-496

EN

The focus of this paper is on stochastic change detection applied in connection with active fault diagnosis (AFD). An auxiliary input signal is applied in AFD. This signal injection in the system will in general allow us to obtain a fast change detection/isolation by considering the output or an error output from the system. The classical cumulative sum (CUSUM) test will be modified with respect to the AFD approach applied. The CUSUM method will be altered such that it will be able to detect a change in the signature from the auxiliary input signal in an (error) output signal. It will be shown how it is possible to apply both the gain and the phase change of the output signal in CUSUM tests. The method is demonstrated using an example.

4

Transient vibration of unsteady linear closed loop systems

Wittbrodt E., Kaliński K. J.

Engineering Transactions

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1999

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Vol. 47, iss. 3

247-268

EN

A problem if unsteady linear closed loop system vibration is formulated and solved in this paper. Proportional, ideal derivative and delayed feedback interaction is considered. The mixed method of rigid and deformable finite elements is extended by including coupling elements, and applied to modelling the system. An unconditionally stable numerical integration variant of the Newmark method is used for solving the problem. Special computer software is implemented and illustrative calculation of the traverse shaper's model are performed. Time and frequency plots for chosen generalised coordinates of the model and for several cases of the feedback interaction, are obtained as results.