NAVAIR Use of OpenVSP

Transcription

1 NAVAIR 4.0M.1.5 NAVAIR Use of OpenVSP Presented to: OpenVSP Workshop 29 Aug 2017 Presented by: AJ Field AIR-4.0M Public Release Authorization

2 Agenda Agenda Role of NAVAIR Conceptual Aircraft Design Our Design Tool Framework How we use OpenVSP now Future plans for using OpenVSP Public Release Authorization

3 Role of Government Design Feasibility Assessment New Aircraft Models Effectiveness Sets of System Capabilities Combat Speed Payload Radius etc Design System Attributes for each Set Engine Type Construction Materials Composition Fuel Burn Rate etc Cost System Cost for each Set Development Flyaway Operating Life Cycle etc Decision Maker Effectiveness vs Cost For Feasible System Capability Sets In-house conceptual design work informs pre-milestone A requirements refinement and S&T studies File: NAVAIR Brief Distribution Statement A Approved for public release; distribution is unlimited, 3 as submitted under NAVAIR Public Release Authorization

4 MAOIE Engine Design Variables Aircraft Design Variables Propulsion Estimates OpenVSP 3D Geometry MAOIE Geometry Weight Estimates Lift & Drag Estimates MAOIE: Multidisciplinary Analysis and Optimization Integration Environment Mission Performance MMPAC Point Performance Single Geometry Result File: NAVAIR Brief Public Release Authorization

5 OpenVSP Enables Wide Trades MAOIE uses OpenVSP during wide tradespace exploration Millions of geometry variations MAOIE gets updated geometry measurements for each variation Surface areas, Cross-Section areas, Volumes These measurements are used by parametric weight and drag estimation modules For configurations within the parametric dataset, these methods are accurate to within 10%, but only if the geometry inputs are accurate OpenVSP enables wide configuration tradespace exploration while maintaining accurate geometry inputs File: NAVAIR Brief Public Release Authorization

6 Parameters Measured Parameters Measured from OpenVSP Fuselage Total Wetted Area Fuselage Max Xsect Area Inlet Longitudinal Length Whole Aircraft Max Length Whole Aircraft Xsect Area Distribution Whole Aircraft Total Volume Potential Fuel Volume File: NAVAIR Brief Public Release Authorization

7 Input Visualization OpenVSP also lets design engineers visualize the geometry they are analyzing File: NAVAIR Brief Public Release Authorization

8 2017 Geometry Process 1. Build a parametric SolidWorks model for a baseline configuration 2. Build an OpenVSP model for the same configuration, tune it to match the SolidWorks measurements 3. Use the OpenVSP model for tradespace exploration 4. Model the selected point in the tradespace with SolidWorks i. check to make sure internal layout and carrier suit constraints still met File: NAVAIR Public Brief Release Authorization

9 OpenVSP Models OpenVSP Link to MAOIE completed through User Parms The user builds any OpenVSP model they want, but all models have a standard set of User Parmameters The Linking and Advanced Linking in OpenVSP are used to shape the geometry based on the user Parms This allows many OpenVSP models without having to recompile the MAOIE C# code The user adds the VSP3 file location into their MAOIE file File: NAVAIR Public Brief Release Authorization

10 User Parms File: NAVAIR Public Brief Release Authorization

11 OpenVSP Link OpenVSP Link to MAOIE completed through Python API During a MAOIE run, the MAOIE (C#) code writes the standard set of User Parm values to a JSON File, then calls a Python script The same set of User Parms are always written out, although some values may be left at zero The Python script reads the JSON file, then uses the OpenVSP Python API to send the User Parm values to OpenVSP The Python also calls the OpenVSP computation methods, and writes the outputs to a JSON for MAOIE to read File: NAVAIR Public Brief Release Authorization

12 Impact Even this initial use of OpenVSP is substantially improving our ability to explore tradespace at the beginning of acquisition programs Using DoD HPC resources, we are running millions of geometry variations to understand the impacts of varying design requirements This wide tradespace exploration would not be possible without the flexibility and accuracy of OpenVSP File: NAVAIR Public Brief Release Authorization

13 Future Plans We have just scratched the surface of how we can utilize OpenVSP Over the next couple years we would like to take advantage of OpenVSP for: CG estimation Ballpark carrier spotting factor estimates VSPAero for performance and Stability & Control analysis CL vs alpha Induced Drag CD min, Wave Drag estimations Linking to/from OpenVSP and MAOIE without prebuilt User Parameters Visualization Simplify initial creation of MAOIE files File: NAVAIR Public Brief Release Authorization

14 Questions? File: NAVAIR Public Brief Release Authorization