2 continues with a look at converter output impedance‚ four-quadrant operation‚ single- and double-converter reversing drives and power factor and supply effects. Part 3 examines the operation of a standard dc drive system with speed and current control.] CHOPPER-FED D.C. MOTOR DRIVES If the source of supply is d.c. (for example in a battery vehicle or a rapid transit system) a chopper-type converter is usually employed. The basic operation of a single-switch chopper was discussed in Chapter 2
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MANAGEMENT CONTROL SYSTEM – RENDELL CASE I. Case Summary This case rises from Fred Bevin concern about the organizational status of his divisional controller. This concern occurred because Mr. Bevins foresaw increasing difficulties with the relationship between the corporate controller and the divisional controllers as the company introduced more modern control techniques. The existing relationship hampered him to could urge the development and use of new technique rapidly. His interest in the controller
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settling time to 2 second with 2% accuracy. First of all‚ to implement lead compensators into a circuit‚ a pole–zero pair is introduced into the open loop transfer function. Lead compensator is a component in a control system that improves an undesirable frequency response in a feedback and control system. Besides that‚ it also provides phase lead in its frequency response. Lead compensator also helps to improve transient response and a small change in steady-state accuracy.Therefore‚ modification of
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National Automated Highway Systems Consortium Technical Feasibility Demonstration‚ held in San Diego from August 7-10‚ 1997‚ successfully demonstrated the technical feasibility of operating standard automobiles‚ Buick LeSabres‚ under precise automatic control at close spacing and at highway speeds. Riders experienced real travel in a fully automated AHS vehicle‚ and were shown that comfortable‚ high-capacity‚ automated travel is technically feasible in the near future. Since platooning enables vehicles
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No.4 Process Control Homework Text p.51 [2] [3] [2] The process in Fig.2.28 heats and cracks the naphtha in heating oven. Consider the following control loops (Multiloop control): (a) Control the outlet temperature of cracked naphtha in heating oven by coordinating the fuel oil flow rate. (b) Control the fuel oil flow rate by coordinating the opening of valve and measuring the fuel oil flow rate. (c) Control so that the flow rate in the three pipelines become equal. (d) Control the total throughput
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and to the filament circuit. c. kVp controls- by selecting the major or minor kVp controls‚ a more precise kilovolt peak is provided. kVp major changes secondary side connection on autotransformer to 10-20 turns. kVp minor changes secondary side connection on autotransformer to 1-2 turns. The kVp meter connected to the output terminals of the autotransformer reads voltage not kV. The pre-reading meter voltage is also monitored continuously.
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power. Other causes may be due to the corruption of software‚ or damage to the any of the peripherals or programmable electronics. End effecter malfunction‚ which may result in a component ejection hazard‚ which can be due to a malfunction of the control system‚ or programming error. Both of the above may occur as a result of a pneumatic or hydraulic equipment dump fault‚ as either may have a reservoir and could be subjected to sudden movements of one or more actuators when a jam-up is freed. Hazards
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the introduction of fuzzy logic into the structure is necessary by the use of appropriate fuzzy rules to assist in the self-tuning of the DBMS‚ wherein the control action is expressed in linguistic terms. Besides Fuzzy logic‚ Neural Networks and Genetic Algorithms can also be used. This significantly improves the query response time. Fuzzy control systems are most suitable to use as they are easy to design‚ are robust and can be easily tweaked to dramatically improve system performance. It was observed
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able to: Explain what is meant by mechatronics and appreciate its relevance in engineering design. Explain what is meant by a system and define the elements of measurement systems. Describe the various forms and elements of open-loop and closed-loop control systems. Recognise the need for models of systems in order to predict their behaviour. ● ● ● ● 1.1 What is mechatronics? The term mechatronics was ‘invented’ by a Japanese engineer in 1969‚ as a combination of ‘mecha’ from mechanisms and ‘tronics’
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Active Power Filter‚ Passive Power Filter and the combination of both. The system has the function of voltage stability‚ and harmonic suppression. The reference current can be calculated by dq transformation. An improved generalized integrator control was proposed to improve the performance of APF. The simulation results of the non- linear systems have been carried out with MATLAB 7.6. 1. INTRODUCTION The growing use of electronic equipment produces a large amount of harmonics in the power
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