I. The document discusses tele-operation systems and the challenges posed by time delays in such systems. It describes various control infrastructure methods that have been developed to address these challenges, including wave variables methods, Smith predictor methods, and sliding mode control methods.
II. The key components of bilateral teleoperation systems are described, including the human operator, master controller, slave manipulator and environment. General issues around communication, control and network infrastructure for teleoperation are also covered.
III. Simulation results are presented demonstrating the position, velocity, force and error responses between the master and slave systems for a teleoperation scenario.
ME-314 Introduction to Control Engineering is a course taught to Mechanical Engineering senior undergrads. The course is taught by Dr. Bilal Siddiqui at DHA Suffa University. This lecture is about block diagram reduction for finding closed loop transfer functions.
Teleoperation:
Definition
Forms of feedback
Teleoperation setup
Uses of teleoperating systems:
Space missions
Teleoperations in nuclear reactors
Military missions
Tele-surgery
Problems in teleoperations
Haptics in teleoperation
Bilateral control of master slave manipulators with constant time delayISA Interchange
This paper presents a novel teleoperation controller for a nonlinear master–slave robotic system with constant time delay in communication channel. The proposed controller enables the teleoperation system to compensate human and environmental disturbances, while achieving master and slave position coordination in both free motion and contact situation. The current work basically extends the passivity based architecture upon the earlier work of Lee and Spong (2006) [14] to improve position tracking and consequently transparency in the face of disturbances and environmental contacts. The proposed controller employs a PID controller in each side to overcome some limitations of a PD controller and guarantee an improved performance. Moreover, by using Fourier transform and Parseval’s identity in the frequency domain, we demonstrate that this new PID controller preserves the passivity of the system. Simulation and semi-experimental results show that the PID controller tracking performance is superior to that of the PD controller tracking performance in slave/environmental contacts.
A Novel Optimal Control Design for Reducing of Time Delay Effects in Teleoper...IDES Editor
The purpose of designing a controller for a
teleoperation system is achieving stability and high efficiency
in presence of factors such as time delay, noise, system
disturbance and modeling errors. In this article seven new
schemes for teleoperation systems is suggested to reduce the
error of tracking between the master and the slave systems. In
the first and second structures, optimal control is applied to the
master and in the third structure it is applied to the slave. In
the forth structure, optimal controller has been designed in
both the master and slave subsystems and by a suitable
combination of the output signals of both controllers and
exerting it to slave, it has been tried to create the best
performance with regard to tracking. In the 5th structure,
optimal controller is applied to both the master and slave
systems and the output of each controller is then applied to it’s
own system. In the structures 6 and 7, using optimal control
and wave transformation, it has been tried to reduce the
tracking error between the master and the slave systems which
is considered as the cost function in this article. In these two
structures, optimal controller guarantees the efficiency of the
system and wave variables method has been used to guarantee
the stability of the system for constant time delay. In this
method, the appropriate selection of weighting factors of cost
function and wave impedance plays a decisive role in the
improvement of system performance and reduction of tracking
error between the master and the slave.
ME-314 Introduction to Control Engineering is a course taught to Mechanical Engineering senior undergrads. The course is taught by Dr. Bilal Siddiqui at DHA Suffa University. This lecture is about block diagram reduction for finding closed loop transfer functions.
Teleoperation:
Definition
Forms of feedback
Teleoperation setup
Uses of teleoperating systems:
Space missions
Teleoperations in nuclear reactors
Military missions
Tele-surgery
Problems in teleoperations
Haptics in teleoperation
Bilateral control of master slave manipulators with constant time delayISA Interchange
This paper presents a novel teleoperation controller for a nonlinear master–slave robotic system with constant time delay in communication channel. The proposed controller enables the teleoperation system to compensate human and environmental disturbances, while achieving master and slave position coordination in both free motion and contact situation. The current work basically extends the passivity based architecture upon the earlier work of Lee and Spong (2006) [14] to improve position tracking and consequently transparency in the face of disturbances and environmental contacts. The proposed controller employs a PID controller in each side to overcome some limitations of a PD controller and guarantee an improved performance. Moreover, by using Fourier transform and Parseval’s identity in the frequency domain, we demonstrate that this new PID controller preserves the passivity of the system. Simulation and semi-experimental results show that the PID controller tracking performance is superior to that of the PD controller tracking performance in slave/environmental contacts.
A Novel Optimal Control Design for Reducing of Time Delay Effects in Teleoper...IDES Editor
The purpose of designing a controller for a
teleoperation system is achieving stability and high efficiency
in presence of factors such as time delay, noise, system
disturbance and modeling errors. In this article seven new
schemes for teleoperation systems is suggested to reduce the
error of tracking between the master and the slave systems. In
the first and second structures, optimal control is applied to the
master and in the third structure it is applied to the slave. In
the forth structure, optimal controller has been designed in
both the master and slave subsystems and by a suitable
combination of the output signals of both controllers and
exerting it to slave, it has been tried to create the best
performance with regard to tracking. In the 5th structure,
optimal controller is applied to both the master and slave
systems and the output of each controller is then applied to it’s
own system. In the structures 6 and 7, using optimal control
and wave transformation, it has been tried to reduce the
tracking error between the master and the slave systems which
is considered as the cost function in this article. In these two
structures, optimal controller guarantees the efficiency of the
system and wave variables method has been used to guarantee
the stability of the system for constant time delay. In this
method, the appropriate selection of weighting factors of cost
function and wave impedance plays a decisive role in the
improvement of system performance and reduction of tracking
error between the master and the slave.
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Delays deteriorate the control performance and could destabilize the overall system in the theory of discretetime
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My Cisco Training Courses @ MFT.Info
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UiPath Test Automation using UiPath Test Suite series, part 3
Tele operation systems
1. Tele-Operation Systems
Presence of “Linear Control Systems”
Lecturer : Mansour.Nch
TeleOperation Conference
Email:PowerSt.Basu@gmail.com
Tel: +98 – 935 658 9590
Summer 2013
R(S) G(S) F(S)
H(S)
4/23/2014
2. Introduction
indicates operation of a machine at a distance.
but is most commonly associated with robotics and
mobile robots
but can be applied to a whole range of
circumstances in which a device or machine is
operated by a person from a distance.
4/23/2014
3. Integrated Model
R(S) G(S) F(S)
H(S)
Tele-Operation
System
Human
Operator
Environment
Xh -Xe
Fh Fe
4/23/2014
4. Diagramof the bilateralTeleoperation
Master
System
Slave
System
Communication
System
Vm Vmd
fsfsd
I. the human operator commands via a master manipulator by exerting a force fh
II. The master moves with velocity: Vm
III. the slave manipulator responds to the reference signal: Vmd
IV. the force fs sensed as a result of contact with the environment and/or some
external source.
V. fe , is transmitted back to the master network, which results in the force fsd to
the master.
4/23/2014
6. Communication Infrastructure
• This Scenario needs a high availability Connection to respond
more faster! , so maybe H-system can solve this Problem
H-System
4/23/2014
7. Master Device Slave Device
A link with high availability Connection
Usually uses Fiber-Optic Technology
When Master fails , Slave Portion Detect this fault immediately
and achieve the control mechanism so fast!
This is a High Redundant Scenario
4/23/2014
9. A big challenge: Time Delay
When local station sends electronic bits to remote station, some delay will be appeared in system
output. several methods are presented since 1957 considering time delay.
1. in 1957, Time delay problem in process control was first tackled by Smith
2. 1981, Vertut showed that the stability of teleoperation systems with delay time could be achieved
by decreasing bandwidth of the system
3. In 1997, Niemeyer and Slotine used wave variables method in teleoperation systems using
passivity theory
4. In 1999, Maza and Velasco-Villa predicted the state of linear systems with time-delays in the input
and the state
5. Park and Cho applied sliding mode methods for controller design in teleoperation systems with
delay time in 1999
6. Prediction, generally in the form of smith predictors (smith 1957), can be combined with wave-
based systems to reduce the effects of the delay (Ganjefar, Momeni & Janabi-sharifi 2002)
7. In 2003 Azorin used A new control method of teleoperations with time delay
8. In 2006 Sirouspour used a LQG controller in teleoperation systems with constant time delay
4/23/2014
11. General Bilateral Teleoperation
• Bilateral: When the contact force is reflected via the master
• actuator to the operator’s hand, the teleoperator system
• is said to be bilateral or force reflecting.
• A bilateral teleoperation Components
Human Master Controller Slave Environment
Vh Vm Vmd Ve
fh fsd fs fe
4/23/2014
12. Scenario of Time Delay in WAN
• The challenge of delivering a packet to the remote station
contains the following factors:
• 1. TTL
• 2. bandwidth
• 3. WAN Speed
• 4. security parameters
• 5. signal processing (Noise , etc.)
4/23/2014
13. Wave variables method
• presents a modification or extension to the theory of passivity
• This method is also closely related to the scattering and small
gain theories.
b
√(2b)
√(2b)
X
F
U
V
F is force
X is velocity
U is forward
V is backward
The basic wave transformation
4/23/2014
14. SMITH Predictor Method
• For systems with a pure transport lag
• allowed for a high loop gain in order to provide better accuracy
• C(s) is a proportional controller (i.e. C(s)=k)
• P(s) is a first order filter with transport lag
•
•C(s)=k ;
C(S) P(S)
r e u y
4/23/2014
( )
1
Ts
e
P S
Ts
15. 4/23/2014
( )
( ) 1
Ts
Ts
y s Ke
r s Ts Ke
( )S
A Delay Term has been appeared in
characteristic equation
So, What the scenario?
In order to remedy this problem
SMITH proposed a minor correction loop around the controller
C(S)
e u•
P(S)(1-e^TS) Compensation
loop
16. C(S) P(S)
r e u y•
P(S)(1-e^TS)
4/23/2014
C(S) P(S)
r e u y
17. 4/23/2014
C(S) P(S)
r e u y•
P(S)(1-e^TS)
The closed-loop system is stable
for any ∆T if:
and for a finite ∆T , if :
24. References
IEEE Journals:
[1] G. Niemeyer and J.-J. E. Slotine. “Using Wave
Variables for system Analysis and Robot Control”.
Proc. 1997 IEEE. Int. Conf. Robotics and
Automation, Albuquerque, New Mexico, pp 1619-
1625.
[2] J. H. Park and H. Cho, “Sliding–Mode Controller
for Bilateral Teleoperation with Varing Time Delay
[3] Elhajj and N. Xi, “Real–Time Control of Internet
Based Teleoperation with Force Reflection”, Proc.
2000 IEEE Int. Conf. Robotics and Automation,
San Francisco CA, April 2000.
4/23/2014