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Physics-based Conceptual Design Tools for Weight Prediction (PBWeight)
OpenVSP Workshop 2016
8/24/2016
NASA Ames
1M4 Engineering Proprietary8/24/2016
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Walkthrough
• Future Work
Overview
2M4 Engineering Proprietary8/24/2016
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Team Introduction
• M4 Engineering, Inc.
– CEO, Dr. Myles Baker
– PI, Tyler Winter
• PBWeight Team
– Brent Scheneman
– Donovan Fung
– Phillip Chung
– Matt Connolly
8/24/2016 M4 Engineering Proprietary 3
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Walkthrough
• Future Work
Overview
4M4 Engineering Proprietary8/24/2016
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PBWeight Overview
7/16/2015 M4 Engineering Proprietary 5
Parametric Geometry Definitions
Exporting Component
OMLs
RapidFEMSketch File
Development
FEM Generation and Merging
Physics-based Analysis and
Weight Statement
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Parametric Geometry Definition
7/16/2015 M4 Engineering Proprietary 6
• Utilized OpenVSP software package to develop parametric geometry representations of the MD-87 and Low Boom configurations
• Were able to rapidly build models by placing schematics in the background and matching via overlays
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Exporting Component OMLs
7/16/2015 M4 Engineering Proprietary 7
• RapidFEM requires OML representations for generating a bounding mesh for the internal structure of each component
MD-87 Geometry
Horizontal Tail
Vertical Tail
Wing
Fuselage
Low Boom Geometry
Fuselage
Wing
Nacelle
Vertical Tail
Horizontal Tail
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RapidFEM Sketch File Development
7/16/2015 M4 Engineering Proprietary 8
• Sketch file contains information defining 2-d “sketch” which is projected onto the OML to define the curves and surfaces needed for structural modeling and analysis
• Required for each component
• Involves defining internal structural layout, material property specifications, non-structural mass locations, control surfaces, load cases, and trimming/merging details
• Have developed a sketch file visualization capability
Horizontal Tail
Vertical Tail
Wing
Fuselage
Fuselage
Wing
Nacelle
Vertical Tail
Horizontal Tail
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FEM Generation and Merging
7/16/2015 M4 Engineering Proprietary 9
• The final step before analysis requires each component FEM to be generated and then merged/trimmed into a complete FEM
Merged MD-87 Baseline Finite Element ModelHorizontal
Tail
Vertical Tail
Wing
Fuselage
Fuselage
Wing
Nacelle
Vertical Tail
Horizontal Tail
Merged Low Boom Baseline Finite Element Model
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Baseline FEM and Internal Structural Layouts
7/16/2015 M4 Engineering Proprietary 10
• MD-87
Vertical Tail
HorizontalTail
Fuselage
Floor
Bulkhead
Wing
Rib
Spars
Ribs
SparsRib
Spars
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Baseline FEM and Internal Structural Layouts
7/16/2015 M4 Engineering Proprietary 11
• Low Boom
Vertical Tail
Horizontal Tail
Fuselage
Floor
Bulkhead
Wing
Ribs Spars
Ribs
Spars
Spars
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PBWeight and RapidFEM Capabilities
• Overall goal is to streamline the internal structural layout process
7/16/2015 M4 Engineering Proprietary 12
Automated Meshing and Modal Analysis
Merging & Trimming
Supported Analysis Types:• Normal Modes• Linear Statics• Static Aeroelastic• Flutter• Optimization
Automated Capabilities:• Fuel Tanks• Bays• Landing Gear• Aero Panels• Control Surfaces• Splines
Support for:• Parametric Trades• Surrogate Model Generation• Complete Weight Statement• Comprehensive Load Case Library• Composite Material Property Specification
and Layup
Automated Wing Layout
Automated Fuselage Layout
OpenVSP Integration
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Walkthrough
• Future Work
Overview
13M4 Engineering Proprietary8/24/2016
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Package Overview
8/24/2016 M4 Engineering Proprietary 14
• PBWeight Build 1.1 BETA Software Package– Built and tested on Windows 7
– OpenVSP 3.5.0 (M4 Distribution)
– RapidFEM• RapidFEM_Batch_Run.exe
– RapidFEM_SketchFileEditor.exe
– Software User Manuals• PBWeight User Manual
• RapidFEM User Manual
– Examples• Example 0 (Simple Wing Example Problem)
– Input Files
– Results
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Walkthrough
• Future Work
Overview
15M4 Engineering Proprietary8/24/2016
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PBWeight Process Summary
8/24/2016 M4 Engineering Proprietary 16
1. Sketch Point Layout and OML Creation
2. Meta-Geometry Definition Creation
3. FEM Creation
4. Analysis and Weight Prediction
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Follow-Along Walkthrough
• Future Work
Overview
17M4 Engineering Proprietary8/24/2016
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Simple Wing Example Problem
• Example Objectives– Demonstrate how to create a sketch point layout in OpenVSP– Demonstrate how to configure a sketch file using the RapidFEM Sketch File
Editor
• Problem Statement– Create a RapidFEM sketch file for a wing geometry with 14 elements given by
the following design parameters: wing span (b), planform area (S), aspect ratio (AR), root/tip chords (cR/cT), and leading edge sweep angle (Λ)
8/24/2016 M4 Engineering Proprietary 18
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Create OpenVSP Model
8/24/2016 M4 Engineering Proprietary 19
• Component Type: Wing
𝒃/𝟐 𝑺 𝑨𝑹 𝒄𝑹 𝒄𝑻 𝚲
647.00 106431 3.93 280 49.00 30°
Deselect XZ Plane Set Span, Root Chord, Tip Chord, and Sweep
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Create Sketch Point Layout
8/24/2016 M4 Engineering Proprietary 20
• Create Sketch Point Layout
• Place Points
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Export Sketch Point Layout
8/24/2016 M4 Engineering Proprietary 21
• Specify Sketch Point Layout to be exported• Specify Export Location• Multiple layouts can be exported at once• M4 RapidFEM Sketch File Editor will Automatically open with the
Sketch Point Layout
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Create MTRL Card (MAT1)
8/24/2016 M4 Engineering Proprietary 22
• Action: Create
• RapidFEM Card: MTRL
• MTRL Type: ISOTROPIC
Card MID E NU RHO
mtrl 1 10600000 0.3 0.1030
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Create PROP Card
8/24/2016 M4 Engineering Proprietary 23
• Action: Create
• RapidFEM Card: PROP
• Prop Type: ISOTROPIC SHELL
CARD PROP TYPE RID MID NSM T LALLOW UALLOW BMIRprop PSHELL 100 1 0.0 0.5 0.1 6.0 0.0
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Create BEAM Cards
8/24/2016 M4 Engineering Proprietary 24
• Action: Create• RapidFEM Card: BEAM• Represent:
– Ribs and Spars (Wing)– Bulkhead and Floor (Fuselage)
• BEAM Paver automatically creates BEAMs between two specified Sketch Points
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Create SKIN Cards
8/24/2016 M4 Engineering Proprietary 25
• Action: Create
• RapidFEM Card: SKIN4
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Create EDGEPOINT Cards
8/24/2016 M4 Engineering Proprietary 26
• Action: Create
• RapidFEM Card: EDGEPOINT
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Create Modal Analysis Cards
8/24/2016 M4 Engineering Proprietary 27
• Action: Create
• RapidFEM Card: ANALYSIS
• Analysis Type: MODES
• Action: Create
• RapidFEM Card: MODES
• Number of Modes: 10
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Finish RapidFEM Sketch File
8/24/2016 M4 Engineering Proprietary 28
• Action: Modify
• RapidFEM Card: MESHSIZE
• Meshsize: 35.0
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Setup & Run RapidFEM
8/24/2016 M4 Engineering Proprietary 29
• Equivalence Tolerance: 0.61
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• Team Introduction
• PBWeight and RapidFEM Overview
• PBWeight Build 1.1 BETA Software
– Package Overview
– PBWeight Process Summary
– Simple Wing Example Problem• (DEMO) Follow-Along Walkthrough
• Future Work
Overview
30M4 Engineering Proprietary8/24/2016
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Future Work
• Build 2
– Enhanced Meshing
– Enhanced Merging/Trimming
– Automated Wing Layout Tool
– Automated Fuselage Layout Tool
• Improved robustness and more unit testing
• More Example Problems
8/24/2016 M4 Engineering Proprietary 31
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Questions?
Thank You!
Tyler [email protected]
Brent [email protected]
562.981.7797
Please send any feedback to:[email protected]
8/24/2016 M4 Engineering Proprietary 32