Upload
dinhhanh
View
214
Download
0
Embed Size (px)
Citation preview
Nacelle Components Optimization Study
with ATOM
Ahmet T. Becene Ph.D.
Goodrich Corporation
MSTC Brecksville, OH
4
Nacelle in open configuration
Right side fan cowl panel in open configuration
Panel stiffeners, latches and longerons are visible
Latches
Stiffeners
Longerons
6
CFM 56 thrust reverser
Nacelle will house the engine, control electronics, de-icing
systems, fuel delivery systems, power generation systems
7
Airbus A380 GP7200 Engine Build
• As much as 95% of the thrust generated is due to cold air bypass
• Each fan blade generates as much power as a Formula 1 engine
• Engine sucks in 1.5 tons of air every second
• The internals of the engine are at half the temperature of the surface of
the sun and the pressure at the center of the engine is equivalent to being
half a kilometer down in the ocean Robert Nuttall, vice president of marketing for Rolls-Royce
10
Nacelle results in laminar flow
Nacelle structure must result in laminar flow and result in minimal drag
11
Nacelle provides lightning strike
protection
April 2011, Emirates Airlines A380 as it lands in London
Current flow results in high temperatures and shock loading
12
Optimization in nature
Material usage optimization is crucial for species’
survival, therefore it is commonly observed in nature
15
Topology Optimization
Topology optimization is a
mathematical approach that
optimizes material layout within a
given design space, for a given set
of loads and boundary conditions
such that the resulting layout meets
a prescribed set of performance
targets
16
Topology Optimization
In general, the structure is optimized by minimizing its
compliance (maximum stiffness) while reducing the material
usage to a given percent of the initial design space
18
Design spaces
Hinge design space Latch design space
Solid envelopes generated within the available
space for topology optimization studies
19
Load cases
Case Load ConditionFx (lbf)
(Hoop)
Fy (lbf)
(Radial)
Fz (lbf)
(Fwd-Aft)
Max Fx FBO Fx1 Fy1 Fz1
Min Fx FBO Fx2 Fy2 Fz2
Max Fy Intact, PBD Fx3 Fy3 Fz3
Min Fy Intact, PBD Fx4 Fy4 Fz4
Max Fz FBO Fx5 Fy5 Fz5
Min Fz FBO Fx6 Fy6 Fz6
Max Fr Intact, PBD Fx7 Fy7 Fz7
Multiple load cases are included in the optimization studies.
Each load case represents a linear elastic analysis step
20
Model setup
Optimization task includes two responses:
1- Strain Energy Response to be minimized
2- Volume Response with maximum percent constraint
23
Results, Hinge
Mass X gr
Tensile S. Y MPa
Displacement Z mm
Mass 0.92X gr8% reduction
Tensile S. 0.98Y MPa2% reduction
Displacement 0.44Z mm56% reduction
Current (metal)
Optimized (metal)
24
Results, Hinge
Mass X gr
Tensile S. Y MPa
Displacement Z mm
Mass 0.75X gr25% reduction
Tensile S. 0.44Y MPa56% reduction
Displacement 0.42Z mm58% reduction
Current (metal)
Optimized (chopped fiber composite)
25
Results, Latch
Current (metal)
Optimized (metal)
Mass X gr
Tensile S. Y MPa
Displacement Z mm
Mass 0.84X gr16% reduction
Tensile S. 1.04Y MPa4% increase
Displacement Z mmSame stiffness
26
Results, Latch
Current (metal)
Optimized (chopped fiber composite)
Mass X gr
Tensile S. Y MPa
Displacement Z mm
Mass 0.47X gr53% reduction
Tensile S. 0.86Y MPa14% reduction
Displacement 0.3Z mm70% reduction
27
• Initial design is almost never the optimized design
• Current applications can benefit from optimization
studies
• New applications need to implement this method
from the beginning of the design cycle for maximum
impact
• Abaqus/ATOM provides easy to use optimization
functionality within the Abaqus/CAE modeling
environment
Conclusions