fundamentals of process control charts
Essentials of Process Control phần 10 ppt
... direct-synthesis controllers The basic idea is to specify the desired response of the system to a particular type of disturbance and then, knowing the model of the process, back-calculate the controller ... PI controller Use r/ values of 0.5 and minutes 15.3 Make Nyquist plots for the process of Problem 15.1 and find the value of gain that gives the following specifications: l l l Gain margin of ... Calculate the controller gain that gives a closedloop damping coefficient of 0.3 CIJA~~EK IS: Stability Analysis of Sampled-Data Systems 537 15.8 A process controlled by a proportional digital controller...
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Essentials of Process Control phần 9 ppt
... continuous analog control Computer control offers a number of advantages that outweigh its theoretical dynamic disadvantages: cost; ease of configuring and tuning control loops; ease of maintenance; ... It is defined below A sequence of impulses z.$, comes out of the impulse sampler on the input of the process Each of these impulses produces a response from the .process Consider the kth impulse ... of powers of z-t, the coefficients in front of all the terms give the values of fCllr,,, The infinite series is obtained by merely dividing the numerator of F,,, by the denominator of Fczj Z(c)...
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Essentials of Process Control phần 8 ppsx
... grounded in the essence of chemical process control will be capable of understanding the features of model predictive control should the need arise The basic idea of MPC is to use a process model (either ... number of zeros and the number of poles of Fts, in the right half of the s plane If the process is openloop stable, none of the transfer functions in &ts, has any poles in the right half of the ... we can tune each controller independently As we will soon see, the dynamics and stability of this multivariable closedloop process depend on the settings of all controllers Controller structures...
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Essentials of Process Control phần 7 pps
... RESPONSE OF FEEDBACK CONTROLLERS Before we give some examples of the design of feedback controllers in the frequency domain, it would be wise to show what the common P, PI, and PID controllers ... 11.13 Bode plots of controllers 11.3.1 Proportional Controller (P) The transfer function of a P controller is G cCs) = KC Substituting s = iw gives Gc(iw) = Kc (11.37) A proportional controller merely ... Proportional-Integral Controller (PI) The transfer function of a PI controller is ~‘IIAIWK I I: F;requency-I>otllaitl Analysis of Closedloop Systems G(i,,) = Kc 397 (11.38) The Bode plot of this combination of...
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Essentials of Process Control phần 6 pps
... important property of complex numbers The magnitude of the product of two complex numbers is the product of their magnitudes The argument of the product of two complex numbers is the sum of their arguments ... the size of the reactor increases The flow rate of cooling water also increases rapidly as reactor size increases The ratio of K,,, to Kmi”, which is a measure of the controllability of the system, ... used a model of the process to calculate the controller settings, but the structure of the model has not been explicitly involved in the controller design There are several alternative controller...
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Essentials of Process Control phần 5 pps
... (N - M) of 1, and the asymptotes go off at 180” Example 8.7 shows that the asymptotes go off at 60” since the order of the system is third * B Use of hIATLAB software The commercial software ... by a factor of over the firepower of the Klingon vessels, which all have the same firepower The firepower of the rest of Kirk’s fleet is on a par with that of the Klingons But these officers have ... advantages of Laplace transforms The techniques involve finding the transfer function of the openloop process, specifying the desired performance of the closedloop system (process plus controller),...
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Essentials of Process Control phần 4 pptx
... controllability factor can be some measure of the “goodness” of control (integral of the squared error), the cost of the control effort, or the value of some controllability measure (such as the plant ... steady-state effects of recycles 6.2 EFFECT OF RECYCLE ON TIME CONSTANTS One of the most important effects of recycle is to slow down the response ,of the process, i.e., increase the process time constant ... The annual profit for each plant is calculated by taking the value of the onspecification products and subtracting the cost of reprocessing off-specification material, the cost of raw materials,...
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Essentials of Process Control phần 3 pdf
... performance of a control system These structures include ratio control, cascade control, and override control 4.1 RATIO CONTROL As the name implies, ratio control involves keeping constant the ratio of ... type of nonlinear control can bc achieved by using nonlinear transformations of the controlled variables For example, in chemical reactor control the rate of reaction can be controlled instead of ... of adaptive control strategies in process control 4.6 VALVE POSITION (OPTIMIZING) CONTROL Shinskey [Chem Erg Prog 72(5):73, 1976; Chem Eng Prog 74(5):43, 19781 proposed the use of a type of control...
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Essentials of Process Control phần 2 ppsx
... briefly at some of the control hardware that is currently used in process control systems: transmitters, control valves, controllers, etc Then we discuss the performance of conventional controllers ... Analog and Digital Controllers The part of the control loop with which we spend most of our time in this book is the controller The job of the controller is to compare the process signal from ... controversial subjects in process control The sizing of control valves is a good example of the engineering trade-off that must be made in designing a plant Consider the process sketched in Fig...
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Essentials of Process Control phần 1 ppt
... Levels of Process Control 1.4.1 Process Control Laws / 1.4.2 Languages qf Process Control / 1.4.3 Levels of Process Control 1.5 Conclusion P A R T 20 22 24 I Time Domain Dynamics and Control ... knowledge not only of these traditional areas but also of the fundamentals of process control For those of us who have been part of this period of development, the attainment of parity with the ... LANGUAGES, AND LEVELS OF PROCESS CONTROL 1.4.1 Process Control Laws Several fundamental laws have been developed in the process control field as a result of many years of experience Some of these may...
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A study of advanced control charts for complex time between events data
... technique, the statistical design of the control charts and the TBE control charts Chapter reviews the current research trend of TBE control charts and the multivariate control charts technique In Chapter ... traditional control charts have encountered a lot of difficulties In order to overcome difficulties of conventional control charts in detecting process shifts in high-quality processes, a new kind of control ... effective control charts for multivariate TBE data and study the optimal statistical design issue of the proposed control charts Chapters provides an introduction of the principle of the control charts...
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Performance analysis and troubleshooting of process control loops
... Flow diagram of proposed framework 111 Figure 6.9: ACF of process variable (y) in example 123 Figure 6.10: BI of process variable (y) in example 124 Figure 6.11: Surrogate data plot of process variable ... ends of gas concentration section Today, the operation of the FCC unit has become advanced, encompassing the use of automatic process controllers to control the key variables This is because control ... plants and (9) Mineral Processing etc However, regardless of the application, the purpose of process control is still the same and its objective is to ensure that the process is kept within certain...
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fundamentals of industrial instrumentation and process control
... 14.4 Implementation of Control Loops 14.4.1 ON/OFF action pneumatic controller 14.4.2 ON/OFF action electrical controller 14.4.3 PID action pneumatic controller 14.4.4 PID action control circuits ... 1.2 Process Control In order to produce a product with consistently high quality, tight process control is necessary A simple-to-understand example of process control would be the supply of water ... understanding of instrumentation and process control Instrumentation and process control involve a wide range of technologies and sciences, and they are used in an unprecedented number of applications...
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fundamentals of semiconductor manufacturing and process control
... the fabrication Supervisory Control Run-by-Run Control Real-Time Control Run-by-Run Control Real-Time Control Run-by-Run Control Real-Time Control Process A Process B Process C wafer movement wafer ... topics are the subject of Chapters and 10 These topics include run-by-run control of unit processes and supervisory control of process sequences, as well as the diagnosis of process and equipment ... and utilization of information occurs at another level of abstraction, which consists of various control loops Finally, the organization of the process belongs to yet another level of abstraction,...
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Tài liệu Application of Computers in Process Control pptx
... Page of Tuning of a PID controller using Ziegler-Nichols Method LAB Objective: 1) To demonstrate the use of PID controller using LabVIEW 2) Finding the values of KP and TI and TD ... there are several PID controller modules We shall use the Academic PID controller The difference between different PID controllers is shown below: Page of Program: Page of Page of Conclusion: 1) ... and described in this note The PID controller encapsulates three of the most important controller structures in a single package The parallel form of a PID controller has transfer function: (...
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IEC 60534 6 1 industrial process control valves mounting details for attachment of positioners
... 61285 (1994) Industrial -process control Safety of analyzer houses 61297 (1995) Industrial -process control systems Classification of adaptive controllers for the purpose of evaluation 61298-1 ... pneumatic signal for process control systems Expression of performance of air quality infra-red analyzers 60534: Industrial -process control valves 60534-1 (1987) Part 1: Control valve terminology ... industrial -process measurement and control equipment in oxygen service Industrial -process measurement and control Terms and definitions Binary direct voltage signals for process measurement and control...
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IEC 60534 6 2 industrial process control valves mounting details for attachment of positioners
... IEC:2000 –5– INDUSTRIAL -PROCESS CONTROL VALVES – Part 6-2: Mounting details for attachment of positioners to control valves – Positioner mounting on rotary actuators Scope This part of IEC 60534 is intended ... INTERNATIONAL ELECTROTECHNICAL COMMISSION –––––––––––– INDUSTRIAL -PROCESS CONTROL VALVES – Part 6-2: Mounting details for attachment of positioners to control valves – Positioner mounting on rotary actuators ... to be in conformity with one of its standards 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights The IEC shall...
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Process control of weaving process
... actual quantity & type of yarn twist have to be maintain Process Control of Sizing Section Output Variable of Sizing Output Quantity Required Quantity Process Control Count of sized yarn 10 To maintain ... algorithm (sequence of finite instruction ) for controlling the output of a specific production process Quality is formed during production process So, if a production process is not controlled, the ... reduced by controlling the yarn tension during sizing Process Control of Drawing-in & trying Section Output Variable of Drawing in & trying Output Quantity Required Quantity Process Control Cross...
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Process control of weaving
... actual quantity & type of yarn twist have to be maintain Process Control of Sizing Section Output Variable of Sizing Output Quantity Required Quantity Process Control Count of sized yarn 10 To maintain ... sized yarn Density of sized beam ( yarn / inch ) 73 75 Density of sized beam can be maintained by controlling the Process Control of Drawing-in & trying Section Output Variable of Drawing in & trying ... achieved PROCESS CONTROL Process control is performed by six steps : Step-1: Draw process flow chart showing real change in products geometry Step-2 : Segregate or highlight the part of the flow...
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Thầy phương principles and practice of automatic control process smith, corripio
... components of all control systems are Sensor/transmitter Also often called the primary and secondary elements Controller The “brain” of the control system Final control element Often a control valve ... 1-6 1-7 A Process Control System Important Terms and the Objective of Automatic Process Control Regulatory and Servo Control Transmission Signals, Control Systems, and Other Terms Control Strategies ... Sampled-Data Controllers 329 7-2.5 Summary of Controller Tuning 330 Tuning Controllers for Integrating Processes 331 7-3.1 Model of Liquid Level Control System 331 7-3.2 Proportional Level Controller...
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