flow and error control techniques wikipedia
Congestion and Error Control in Overlay Networks
... orduplicated segments. Error control in TCP is achieved by using a version of the Automatic RepeatreQuest (ARQ) error control protocols operating at DLL and it involves both error detection and retransmission ... protocols.2.3.1 Stop -and- Wait ARQThe Stop -and- Wait ARQ error control mechanism is based on the Stop -and- Wait flow control. In its simplest form, the sender transmits a frame and it waits for ACK. ... proposed that concerncongestion and error control for such environments. Following the discussion on IP multicast,Chapter 4 presents congestion and error control schemes and algorithms operating at...
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The Control Techniques Drives and Controls Handbook
... 112Performance and applications 112Direct torque control 1133 D.C. motor drive control 114Flux controller 114Torque controller 115Performance and applications 1164 Analysis of and set up of a speed controller ... 109Current control 109Speed control 110Performance and applications 110Closed-loop induction motor drive 110Flux calculator and reference-frame generation 111Flux control 111Performance and applications ... 326Appendix A Standards for drives 329A1 IEC (international) standards 330Planned future IEC61800 standards 332A2 CENELEC (EC) standards 332A3 British standards 334A4 IEEE (USA) standards 335A5...
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Báo cáo hóa học: " Cross-layer based adaptive wireless traffic control for per-flow and per-station fairness" ppt
... Average throughput of nine UDP downlink flows and one TCP downlink flow (two greedy flows).Figure 19 Average throughput of two small UDP flows and two large UDP flows within the same station.Visoottiviseth ... contains one UDP uplink flow and one TCP downlink flow. Table 6 Experiment setup and Jain’s fairness index for greedy flows within a stationScenario no. Number of flows and its link direction ... downlink flow, (3) one UDP uplink flow with one TCP downlink flow, and (4) one TCP uplink flow with one TCP downlink flow. Figure 5 shows the average throughput of each flow infour cases. As we can...
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Essentials of Control Techniques and Theory_1 pptx
... variables.Figure 1.3 Ball -and- plate integrator.91239.indb 7 10/12/09 1:40:43 PM 8 ◾ Essentials of Control Techniques and TheoryComputer simulation and discrete time control go hand in hand together. At ... 1:40:45 PM Essentials of Control Techniques and Theory91239.indb 1 10/12/09 1:40:29 PM This page intentionally left blank 6 ◾ Essentials of Control Techniques and Theorya small sinusoidal ... of Control Techniques and Theorywendor for JavaScript or C:while (t < tmax){H = H + (-k*H + u)*dt;t = t + dt;}Now the code has to be “topped” to set initial values for H, t, and u, and...
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Essentials of Control Techniques and Theory_4 potx
... 10/12/09 1:42:34 PM 78 ◾ Essentials of Control Techniques and Theory7.2 Sine-Wave FundamentalsSine-waves and allied signals are the tools of the trade of classical control. ey can be represented ... broader view.91239.indb 77 10/12/09 1:42:21 PM 70 ◾ Essentials of Control Techniques and Theoryi.e., for the same position control system, but with much reduced velocity feedback. You will ... 1:42:11 PM 82 ◾ Essentials of Control Techniques and TheoryNow the derivative of a sine-wave is another sine-wave (or cosine-wave) of the same frequency, shifted in phase and probably changed in...
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Essentials of Control Techniques and Theory_5 docx
... ◾ Essentials of Control Techniques and TheorySince our motor is a simple two-integrator system with no damping, our state variables x and v will be simulated byx = x + x*dt and v = v + u*dtWe ... computer control by sampling the error at intervals of 0.1 second, and applying a proportional corrective drive to the motor. Choose a suitable gain and discuss the response to an initial error. ... Essentials of Control Techniques and TheoryWe can save a lot of typing if we define the length of the stick to be one meter.To find the characteristic equation, we must then find the determinant and equate...
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Essentials of Control Techniques and Theory_6 docx
... ◾ Essentials of Control Techniques and Theory10.2 Complex Planes and MappingsA complex number x + jy is most easily visualized as the point with coordinates (x, y) in an “Argand diagram.” In ... position error is now (command-x), so we can demand an angle of tilttiltdem = c*(command-x)-d*vest;which we then constrain withif(tiltdem>.1){tiltdem=.1;}if(tiltdem< 1){tiltdem= 1;} and ... unscrambling sinusoids and we have seen how to analyze and control systems in terms of discrete time signals and transforms.is could be a good place to end a course in practical control. It is a...
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Essentials of Control Techniques and Theory_7 pdf
... k+–1s(s+1)OutputpositionPositiondemand Error Figure 12.1 Position control with variable feedback.91239.indb 166 10/12/09 1:44:49 PM 148 ◾ Essentials of Control Techniques and Theoryfavorite. Soon time-domain and pseudo-random binary sequence ... 172 ◾ Essentials of Control Techniques and Theory12.4 Plotting with Poles and ZeroesWith the easy availability of computer power, the ability to plot a root locus by hand might seem have dubious ... But these coefficients represent the sum of the roots of Z and 91239.indb 174 10/12/09 1:45:01 PM 158 ◾ Essentials of Control Techniques and TheorySuppose that we wish to consider a variety of...
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Essentials of Control Techniques and Theory_9 potx
... Figure 16.7: 1. Controllable and observable 2. Controllable but not observableControllable and observableControllable butnot observableObservable butnot controllableNeithercontrollablenor ... of Control Techniques and Theory 3. Observable but not controllable 4. Neither controllable not observableClearly any system model built to represent a transfer function must be both controllable ... controllable and observable—there is no point in adding uncontrollable or unob-servable modes. e control engineer is baffled by the fourth type of subset, some-what frustrated by sets two and three, and...
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Essentials of Control Techniques and Theory_10 pptx
... 244 ◾ Essentials of Control Techniques and Theory and added a controller with state z, where zKzLyMv=++We apply signals from the controller dynamics, the command input and the system output ... settling—the sort of system that does not really need feedback control! 91239.indb 233 10/12/09 1:46:33 PM 230 ◾ Essentials of Control Techniques and TheoryNow AB =−−=−01120112so ... 151++ss91239.indb 244 10/12/09 1:46:59 PM 248 ◾ Essentials of Control Techniques and TheoryNow we have let a computer get in on the act, and the rules must change.x(t) is measured not continuously,...
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Essentials of Control Techniques and Theory_11 potx
... quantization errors.If a controller outputs a position demand to an analog position control subsystem, the command might require a great number of levels to define the target 01Figure 20.2 Control ... zww=+−22ττ and finally the z-plane poles and zeros of the controller enable the controller code to be written.Q 19.5.1In a system sampled 10 times per second, what discrete time controller ... integration.91239.indb 276 10/12/09 1:48:00 PM 256 ◾ Essentials of Control Techniques and Theory and we are back in the world of eigenvectors and eigenvalues. If we can find an eigenvector x with its...
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Essentials of Control Techniques and Theory_12 potx
... the glide angle to control the speed, and to add extra thrust and energy to gain height; the roles of the throttle and aileron were reversed. Both control systems worked and maybe had the same ... 21.1.N1: e command input is subject to noise of various forms, from quantiza-tion of a numeric command to tolerances in encoding a control lever. is error is outside the loop and therefore ... value of the error. V(s)Y(s)G(s)H(s)U(s)F(s)–N(s)Figure 21.2 Control loop with disturbance noise.91239.indb 291 10/12/09 1:48:22 PM 308 ◾ Essentials of Control Techniques and Theory22.5...
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Essentials of Control Techniques and Theory_13 pptx
... familiarity with many aspects of control theory, especially in the foundations in time and frequency domain and in methods of designing and analyzing linear systems and controllers. Many other topics ... 184Ball and plate integrator, 6–7Bang-bang control control law, 74controller, 182velodyne loop, 183parabolic trajectories, 74Bang–bang control and sliding mode, 74–75Bellman’s Dynamic Programing, ... 292–295PRBS, see Pseudo-random binary sequence (PRBS)Precision simulation, 6Predictive control, 308PSET commands, 12Pseudo-random binary sequence (PRBS), 148, 212Pseudo-random sequence illustration,...
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Essentials of control techniques and Keyword Stats_2 pptx
... reversed or turned off. A and D on with B and C off will drive the motor one way while B and C on with A and D off will drive it the other way. By switching B and D on while A and C are off, braking ... it gives a tough control problem too. If we want to use a continuous controller, we have to consider integral control. Next time you stand in the shower, apply proportional control with a high ... values so that if the position error and velocity of the position control system are doubled, then the drive will also double. Double them again and again, and the drive can be increased without...
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