flow and error control techniques wikipedia
Congestion and Error Control in Overlay Networks
Ngày tải lên :
26/10/2013, 17:15
... or
duplicated segments. Error control in TCP is achieved by using a version of the Automatic Repeat
reQuest (ARQ) error control protocols operating at DLL and it involves both error detection and
retransmission ... protocols.
2.3.1 Stop -and- Wait ARQ
The 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 concern
congestion and error control for such environments. Following the discussion on IP multicast,
Chapter 4 presents congestion and error control schemes and algorithms operating at...
- 78
- 320
- 0
The Control Techniques Drives and Controls Handbook
Ngày tải lên :
20/10/2013, 02:15
... 112
Performance and applications 112
Direct torque control 113
3 D.C. motor drive control 114
Flux controller 114
Torque controller 115
Performance and applications 116
4 Analysis of and set up of a speed controller ... 109
Current control 109
Speed control 110
Performance and applications 110
Closed-loop induction motor drive 110
Flux calculator and reference-frame generation 111
Flux control 111
Performance and applications ... 326
Appendix A Standards for drives 329
A1 IEC (international) standards 330
Planned future IEC61800 standards 332
A2 CENELEC (EC) standards 332
A3 British standards 334
A4 IEEE (USA) standards 335
A5...
- 7
- 500
- 0
Báo cáo hóa học: " Cross-layer based adaptive wireless traffic control for per-flow and per-station fairness" ppt
Ngày tải lên :
20/06/2014, 22:20
... 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 station
Scenario 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 in
four cases. As we can...
- 26
- 426
- 0
Essentials of Control Techniques and Theory_1 pptx
Ngày tải lên :
21/06/2014, 07:20
... variables.
Figure 1.3 Ball -and- plate integrator.
91239.indb 7 10/12/09 1:40:43 PM
8 ◾ Essentials of Control Techniques and Theory
Computer simulation and discrete time control go hand in hand together. At ... 1:40:45 PM
Essentials of
Control Techniques
and Theory
91239.indb 1 10/12/09 1:40:29 PM
This page intentionally left blank
6 ◾ Essentials of Control Techniques and Theory
a small sinusoidal ... of Control Techniques and Theory
wend
or 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...
- 27
- 309
- 0
Essentials of Control Techniques and Theory_4 potx
Ngày tải lên :
21/06/2014, 07:20
... 10/12/09 1:42:34 PM
78 ◾ Essentials of Control Techniques and Theory
7.2 Sine-Wave Fundamentals
Sine-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 Theory
i.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 Theory
Now the derivative of a sine-wave is another sine-wave (or cosine-wave) of the
same frequency, shifted in phase and probably changed in...
- 27
- 424
- 0
Essentials of Control Techniques and Theory_5 docx
Ngày tải lên :
21/06/2014, 07:20
... ◾ Essentials of Control Techniques and Theory
Since our motor is a simple two-integrator system with no damping, our state
variables x and v will be simulated by
x = x + x*dt
and
v = v + u*dt
We ... 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 Theory
We 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...
- 27
- 391
- 0
Essentials of Control Techniques and Theory_6 docx
Ngày tải lên :
21/06/2014, 07:20
... ◾ Essentials of Control Techniques and Theory
10.2 Complex Planes and Mappings
A 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 tilt
tiltdem = c*(command-x)-d*vest;
which we then constrain with
if(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...
- 27
- 398
- 0
Essentials of Control Techniques and Theory_7 pdf
Ngày tải lên :
21/06/2014, 07:20
... k
+
–
1
s(s+1)
Output
position
Position
demand
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 Theory
favorite. Soon time-domain and pseudo-random binary sequence ... 172 ◾ Essentials of Control Techniques and Theory
12.4 Plotting with Poles and Zeroes
With 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 Theory
Suppose that we wish to consider a variety of...
- 27
- 349
- 0
Essentials of Control Techniques and Theory_9 potx
Ngày tải lên :
21/06/2014, 07:20
... Figure 16.7:
1. Controllable and observable
2. Controllable but not observable
Controllable and
observable
Controllable but
not observable
Observable but
not controllable
Neither
controllable
nor ... of Control Techniques and Theory
3. Observable but not controllable
4. Neither controllable not observable
Clearly 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...
- 27
- 416
- 0
Essentials of Control Techniques and Theory_10 pptx
Ngày tải lên :
21/06/2014, 07:20
... 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 Theory
Now
AB =
−−
=
−
01
12
0
1
1
2
so
...
15
1
+
+
s
s
91239.indb 244 10/12/09 1:46:59 PM
248 ◾ Essentials of Control Techniques and Theory
Now we have let a computer get in on the act, and the rules must change.
x(t) is measured not continuously,...
- 27
- 239
- 0
Essentials of Control Techniques and Theory_11 potx
Ngày tải lên :
21/06/2014, 07:20
... 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
0
1
Figure 20.2 Control ...
z
w
w
=
+
−
2
2
τ
τ
and finally the z-plane poles and zeros of the controller enable the controller code
to be written.
Q 19.5.1
In 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...
- 27
- 345
- 0
Essentials of Control Techniques and Theory_12 potx
Ngày tải lên :
21/06/2014, 07:20
... 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 Theory
22.5...
- 27
- 368
- 0
Essentials of Control Techniques and Theory_13 pptx
Ngày tải lên :
21/06/2014, 07:20
... 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 ... 184
Ball and plate integrator, 6–7
Bang-bang control
control law, 74
controller, 182
velodyne loop, 183
parabolic trajectories, 74
Bang–bang control
and sliding mode, 74–75
Bellman’s Dynamic Programing, ... 292–295
PRBS, see Pseudo-random binary
sequence (PRBS)
Precision simulation, 6
Predictive control, 308
PSET commands, 12
Pseudo-random binary sequence (PRBS),
148, 212
Pseudo-random sequence illustration,...
- 16
- 233
- 0
Essentials of control techniques and Keyword Stats_2 pptx
Ngày tải lên :
21/06/2014, 13:20
... 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...
- 27
- 283
- 0
