Presentation to VTB review 2003

1
VTB for HIL and Reliability Modeling
Gennady Balim, Vladimir Chervyakov, Vladimir
Lyashev, Michael Maksimov, Nikoly Merezhin, Vadim
Popov
Taganrog State University of Radio Engineering,
Russia
2
VTB Application for

• Hardware-in-the-Loop (HIL) modeling
• Distributed simulation (DS)
• Overheat and Reliability (OHR) Estimation

3
Modeling by parts

• Partitioning of original system into several
  parts (subsystems) with following exchange of
  results of simulation of each subsystem through
  coupling schemes.
• Possibility of parallel computations.
• Possibility of simulation of system composed from
  parts with different physical nature.
• Possibility of simulation of space distributed
  systems.
• Low convergence and computation stability.

4
Coupling schemes

• Basic coupling scheme
• Generalized coupling scheme

5
Last year problems

• Investigation the stability and convergence of
  generalized coupling scheme.
• Development of adapters for physical realization
  of coupling schemes for HIL modeling.
• Partitioning systems into more than two parts,
  each part having more than just one conventional
  (two wires) port.
• Developing of VTB modules for OHR estimation for
  nonlinear systems.

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Generalized Coupling Scheme(GCS)
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Generalized Coupling Scheme
Initial system A B
System splited into parts ADB
?perator equivalent circuit of the generalized
coupling scheme

8
Characteristics of partitioned system with
generalized coupling scheme

• Poles of G21and G12 can be found
• as
• Stability conditions

and
and

• We can provide equalities r1 Z2 and r2 Z1
  calculating Z1 and Z2 on each step of simulation
  as

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Equivalent Transformation of General Coupling
Scheme (GCS) and its Realization for HIL Modeling
A/D D/A converters

VTB software model
VTB
Adapter
Hardware
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Adapters for realization GCS with equivalent r
IL
r
IL
Uin
UL
RL
r
Uin
RL
UL
Rmeas
Realization of Thevenin equivalent and Norton
equivalent with constant r
Uin
IL
Rmeas
UL
RL
Realization of equivalent source with wide range
changing r
Calculated Output Resistance Characteristic
Voltage of Thevenin equivalent
Current of Norton equivalent
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Analytical Research of Stability at HIL Modeling
on Test Problem
Partition the interconnected system into the ROS
and HUT and combine their with the help of the
generalized coupling scheme. Hybrid equations set
HUT it is described by the continues differential
equation
Where
ROS - the algebraic discrete equation
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Transition Matrix of Hybrid System
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Stability of HIL modeling for the case R0ltR1
h
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Stability of HIL modeling for the case R0gtR1
h
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Modeling of Multipart Systems
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Generalized Coupling Scheme
Initial system A B
System splited into parts ADB
?perator equivalent circuit of the generalized
coupling scheme

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Definition of Multipart System
C
S
S
C
A
A
D
B
D
B
Initial system S including subsystems A, B, C and
D
Multipart system S
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Basic Multi-terminal Coupling Scheme
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Modeling of three parts system
Initial system where B is Two-port with Z
parameters
Partitioned System using two GCS
Comment The best values of GCS parameters in
order to provide stability and convergence are r1
Z11-Z21Z12/(Z22Z2), r2 Z1, r3 Z2 ? r4
Z22-Z21Z12/(Z11Z1).
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The example of the three parts system modeling
The initial system
Partitioned system
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Comparison of simulation results
The red plot is the result of distributed
simulation with the best value of parameters of
general coupling schemes
The black plot is the result of distributed
simulation with inproper value of parameters of
general coupling schemes
The green plot is the simulation result of
initial system
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Multi-terminal Coupling Scheme for Asynchronous
3-Phase Machine
W
Coupling Scheme
Phases
Mechanical part
Shaft
Electrical part
T
A
UA
EA
UB
B
C
JT
EW
EB
JA
JB
UC
EC
JC
IA
IB
IC
N
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Test Bed for 3-Phase Machine
Computer
Asynchronous Machine as a model
power supply 260V
power supply 20V
Photosensor
3-channel adapter
DC Motor and 1 channel adapter as a Torque Source
Input/output terminal boards
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Overheat and Reliability EstimationinVTB
Environment
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Fundamentals
Simulation objects
Application
Electrical and electromechanical devices and
systems
On initial stages of design
Initial data

• Circuit diagrams and drawings of designed device
• Material parameters
• Working conditions

• Thermodynamical theory of reliability
• The time of non-failure operation is determines
  by intensity and frequency spectrum of
  non-equilibrium fluctuations

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Main Steps of Work

• On the previous steps of research we have
• developed methods for computation of intensity of
  energy fluctuation in electrical systems and
  using these results for estimation of non-failure
  operating time of such systems
• created the VTB module designated for overheat
  and reliability estimation of linear devices and
  systems.
• experimented with methods of VTB application for
  simultaneous electrical heat simulation
• During last year we have
• suggested the approach to OHR estimation of
  nonlinear systems in VTB environment
• made the first steps to more detailed analysis of
  temperature fields of components and whole system
• developed more sophisticated approach to estimate
  the intensity of non-equilibrium energy
  fluctuation on basis of their equivalent circuits

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Structure chart for OHR Estimation
Electrical simulation for DC-source
(step-function)
VTB model
No
Linear?
Yes
ESTIMATOR (for linear circuits)
Storing output results
Computations of dissipation power
FFT
Averaged frequency characteristics
Reliability parameters
Intensity of fluctuations
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A Test Problem
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Results of simulation and estimation
E voltage of power supply for Operational
Amplifiers P - consumed power ?T overheat
respect to background temperature NFT
Non-Failure Operating Time
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We are going to work over

• development of generalized multi-terminal
  coupling scheme
• investigation of computational features of that
  scheme
• considering examples of its application for
  simulation of multipart systems and for HIL
  simulation.

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The End

• Thank you for attention!