02_BOOST_Efficient_Performance_Design
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BOOST-Efficient Performance Design by Means of Design Explorer
2008-10-10
Content
Project definition
Introduction to Design Explorer Optimization
Conclusion
Project definition
Engine:
4 cylinder NA gasoline engine
Because of production costs:
No variable valve train possible
No variable Intake maniflod
Development Target:
Shift max. Torque to 4500 rpm
Improve low-end torque
No or minimal loss at rated speed
Optimization perfomed with help of AWS
Design Explorer
Content
Project definition
Introduction to Design Explorer Optimization
Conclusion
AVL AST Design Explorer
Provides basic functionality for
Design of Experiments
[Algorithms: Full Factorial Design, Sobol Sequence, Latin Hypercube,
Orthogonal Arrays]
Optimization
[Algorithms: Nelder-Mead, NLPQL,Genetic Algorithm]
Graphical user interface that supports the definition of the of
DOE/Optimization problem
Easy to use Workflow steps
AVL AST Design Explorer
Define Optimization Problem in Design Explorer Step 1:Start
Design Explorer with
BOOST model.
Step 2a:Define Design
Variables(=input
variation
parameters) and
their bounds.
Step 2b:Define non-
linear Constraints
for Design Variables
to restrict the design
space.
AVL AST Design Explorer
Define Optimization Problem in Design Explorer Step 3a:Define Objectives
from
the responses (=output or
result data) of
IMPRESS chart.
Step 3b:Define Constraints
from
the responses of
IMPRESS Chart.
AVL AST Design Explorer
Optimization Algorithm in Design Explorer Step 4:
Select Genetic
Algorithm and
set Parameter
values.
Step 5:
Monitor results
of the optimization
process during operation.
Step 6a:
Visualize Results of the
Optimization Run.
Directly show transient
Results using IMPRESS
Chart.Optimization results
AVL AST Design Explorer
AVL AST Design Explorer
Result Analysis Step 6b:
Visualize Results of the
Optimization Run:
Scatter Plot 2D
Scatter Plot 3D
Histogram Plot
History Plot
Bubble Plot 4D
Content
Project definition
Introduction to Design Explorer Optimization
Conclusion
Optimization: Example1
Design variables:
Length of Pipe 3; mainly responsible for
low-end torque
Lengths of Pipes 10 to 13; mainly
responsible for high-end torque
Lengths of pipes28 and 29; pulse
converter producing low pressure during
exhaust stroke
All intake and exhaust valve timings