Xem 1-20 trên 104 kết quả Control loops
  • Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed to keep some important process variable such as pressure, flow, level, temperature, etc. within a required operating range to ensure the quality of the end product. Each of these loops receives and internally creates disturbances that detrimentally affect the process variable, and interaction from other loops in the network provides disturbances that influence the process variable....

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  • The perennially bestselling third edition of Norman A. Anderson's Instrumentation for Process Measurement and Control provides an outstanding and practical reference for both students and practitioners. It introduces the fields of process measurement and feedback control and bridges the gap between basic technology and more sophisticated systems. Keeping mathematics to a minimum, the material meets the needs of the instrumentation engineer or technician who must learn how equipment operates.

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  • Direct torque control - or DTC - is the most advanced AC drive technology developed by any manufacturer in the world. The purpose of this technical guide is to explain what is; why and how it has evolved; the basic theory behind its.

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  • Introduction to java programming: Chapter 4 - Loop's Objectives is to use while, do-while, and for loop statements to control the repetition of statements; understand the flow of control in loop statements; use Boolean expressions to control loop statements.

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  • A control system is a collection of components working together under the direction of some machine intelligence. In most cases, electronic circuits provide the intelligence, and electromechanical components such as sensors and motors provide the interface to the physical world. A good example is the modern automobile. Various sensors supply the on-board computer with information about the engine’s condition. The computer then calculates the precise amount of fuel to be injected into the engine and adjusts the ignition timing. T...

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  • From the principles of electrical engineering it is known that the 3-phase quantities of the 3-phase AC machines can be summarized to complex vectors. These vectors can be represented in Cartesian coordinate systems, which are particularly chosen to suitable render the physical relations of the machines. These are the field-orientated coordinate system for the 3- phase AC drive technology or the grid voltage orientated coordinate system for generator systems.

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  • Tham khảo sách 'the pid control algorithm - how it works, how to tune it, and how to use it', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Fuzzy control is a practical alternative for a variety of challenging control applications since it provides a convenient method for constructing nonlinear controllers via the use of heuristic information. Such heuristic information may come from an operator who has acted as a “human-in-the-loop” controller for a process. In the fuzzy control design methodology, we ask this operator to write down a set of rules on how to control the process, then we incorporate these into a fuzzy controller that emulates the decision-making process of the human.

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  • This book will discuss the topic of Control Systems, which is an interdisciplinary engineering topic. Methods considered here will consist of both "Classical" control methods, and "Modern" control methods. Also, discretely sampled systems (digital/computer systems) will be considered in parallel with the more common analog methods. This book will not focus on any single engineering discipline (electrical, mechanical, chemical, etc), although readers should have a solid foundation in the fundamentals of at least one discipline....

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  • The current control problems present natural trend of increasing its complexity due to performance criteria that is becoming more sophisticated. The necessity of practicers and engineers in dealing with complex dynamic systems has motivated the design of controllers, whose structures are based on multiobjective constraints, knowledge from expert, uncertainties, nonlinearities, parameters that vary with time, time delay conditions, multivariable systems, and others.

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  • A systematic control design methodology is introduced for multi-input/multi-output stable open loop plants with multiple saturations. This new methodology is a substantial improvement over previous heuristic single-input/single-output approaches. The idea is to introduce a supervisor loop so that when the references and/or disturbances are sufficiently small, the control system operates linearly as designed.

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  • The perspective of this book is that the steady - state separation model should also be the basis for developing the control confi guration for the column. Yes, a steady - state model! Although the technology to do so is widely available, extending to a dynamic model is not necessary for developing the column control confi guration. The most crucial component of every process control application is developing the piping and instrumentation (P & I) diagram that defi nes the control confi guration for the process and for each unit operation, such as distillation, within that process.

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  • So far we learned pre-test loops such as the general while loop, counter controlled loops specifically for loop, sentinel controlled loops and flag controlled loops. In all these loops we initialized the loop control variable(s) and tested the condition before entering the loop. For instance, data-validation would require the data to be read at least once and then test for its validity. There are special situations were the loop must be executed at least once before the testing is done. Two examples come to mind, a circular queue, and sorting.

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  • Bài báo này nói về vài nguyên tắc cơ bản. Các nguyên tắc này được thấy rõ khi hệ thống điều khiển còn là single loop hay DCS. Khi điều khiển bằng computer thịnh hành hơn, controller sẽ trở thành các hộp đen. Nếu chúng ta không nắm rõ các nguyên tắc, sẽ khó phân tích hệ thống điều khiển. Tất cả các nguyên tắc trong bài báo này được đưa một cách đơn giản, có thể dùng như một danh sách của những điều cần biết và tìm hiểu thêm.

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  • In this chapter, you will: Learn about repetition (looping) control structures; explore how to construct and use count-controlled, sentinel-controlled, flag-controlled, and eof-controlled repetition structures; examine break and continue statements; discover how to form and use nested control structures;…

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  • The following will be discussed in this chapter: Conditions, if statement, && logical operator, || logical operator, ! logical operator, switch statement, while loop, do loop, for loop, loop comparison, nested loops, boolean variables, input validation, boolean logic, expression evaluation practice.

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  • Student are now introduced to the fact that computers cannot only do computitions, but can also make decisions. Decision statements for the most part are fairly straight-forward and fairly simple, as are the relation operators. A conditional statement works on the single statement that follows it. This chapter will introduce "Decision and control statements" in C, inviting you refer.

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  • This chapter introduces two-inductance, T and T', per-phase equivalent circuits of the induction motor for explanation of the scalar control meth-ods. The open-loop, Constant Volts Hertz, and closed-loop speed control methods are presented, and field weakening and compensation of sup and stator voltage drop are explained. Finally, scalar torque control, based on decomposition of the stator current into the flux-producing and torque-producing components, is described.

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  • Chapter 4: Drive Control content presentation A.C motor drive control, D.C motor drive control, analysis of and set up of a speed controller. Invite you to consult.

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  • After completing this unit, you should be able: To write programs for executing statements repeatedly using a while loop, to develop a program for GuessNumber, to follow the loop design strategy to develop loops, to develop a program for SubtractionQuizLoop, to control a loop with a sentinel value,...

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