GENERAL INFORMATION
-------------------

1. Dataset Title: 

	M001 - GVT Data and Nastran models (August 2024)
	

2. Authorship: 

	Name:  Xavier Carrillo Córcoles
	Institution:  Delft University of Technology, Faculty of Aerospace engineering, Aerospace Structures and Materials
	Email:  X.CarrilloCorcoles@tudelft.nl
	ORCID:  0000-0003-3503-3999


DESCRIPTION
-----------

1. Abstract:
	
	GVT Data and Nastran models of five wings with a flared folding wingtip, featuring different stiffness properties.
	The GVT data is the modal test input file automatically generated by NX/Simcenter and contains the position of the sensors and the different mode shapes
	The Nastran models are a new version using different modelling techniques. The baseline and updated models are provided for each wing.
	 

2. Keywords:

	Flared folding wingtips
	Aeroelastic tailoring
	Ground Vibration Tests
	Model update
	 

3. Date of data collection:

	GVT Data: October 2021
	FE Models: August 2024


4. Date of dataset publication:
	
	See 4TU.ResearchData citation metadata


5. Funding: 
	
	Delft University of Technology


ACCESS INFORMATION
------------------

1. Creative Commons License of the dataset:

	This work is licensed under the Creative Commons Attribution 4.0 International License. 
	To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.


2. Dataset DOI:

	https://doi.org/10.4121/984090ea-26fd-4809-8dac-f41367bf8916


VERSIONING AND PROVENANCE
-------------------------

1. Last modification date:

	August 8th 2024 - Initial release


2. Was data derived from another source? If yes, which source?
	
	The data was not derived from any other source


METHODOLOGICAL INFORMATION
--------------------------

1. Description of data collection methods:

	Test setup for the GVT presented in:
		- R1: Wing Stiffness and Hinge Release Threshold Effects on Folding Wingtip Gust Load Alleviation - https://doi.org/10.2514/6.2022-1559
		- R2: Effect of Wing Stiffness and Folding Wingtip Release Threshold on Gust Loads - https://doi.org/10.2514/1.C037108

	Wing models:
		- Wing models described in references R1 (Section III) and R2 (Section III).
		- Wing featuring a flared folding wingtip and a hinge mechanism to lock/release the wingtip at the desired instant.
		- 3D printed structure covered in hot shrinking foil to give the aerodynamic shape
		- Main load bearing element: carbon fibre prepreg laminate glued inside the 3D printed shape.
		- 5 wings: each wing with a different carbon fibre laminate (i.e. different structural properties)	

	Experimental procedure:
		- The modal response of each wing was analysed using the laser vibrometer and a modal hammer to excite the wing in the out-of-plane direction.
		- The measurements where processed using Simcenter Testlab to extract the mode shapes and natural frequencies.
		- The data was imported to Simcenter 3D to conduct modal correlation with the FE Models.

	Data collection and processing:
		- Polytec PSV-500 laser scanning vibrometer: laser to conduct GVT measurements.
		- Maul-Theet vImpact-61: automatic modal hammer to conduct GVT measurements.
		- Simcenter TestLab: Software to extract mode shapes and natural frequencies from data imported from Polytec software
		- Simcenter 3D: Pre/Post-processing software to create FE models and conduct correlation of FEM with GVT.

	Modelling procedure:
		- The orignal model was created using Simcenter 3D.
		- The original model was correlated to the GVT data using the model correlation procedure in Simcenter 3D.
		- A new model is created based on the original. The new one has an addition of 20 LE and TE masses that can me modified to tune the modal repsonse.
		- Using SOL200 from Simcenter Nastran and the model update procedure, the masses are tunned to improve the correlation with the GVT data.


2. Methods for processing the data: 

        No specific method for processing the data. See software to import data in section below.


3. Instrument- or software- specific information (incl. software version) needed to interpret the data:

	GVT data can be imported using Simcenter 3D. It is unknown if there is compatibility with different software.
	FEM files are generated using Simcenter 3D, hence runnning in NX Nastran. However, the files are compatible with MSC Nastran.
	All the files are shared as input text files, so they can be imported using any version of the software. They were created using Simcenter v2022.1 



FILE OVERVIEW
-------------

1. Explain the file naming convention, if applicable:

	Two shared folders:

	- GVT Data
		Description:
		Folder containing the files related to the ground vibration test for each wing
		
		Files:
		   - TestData_WingA.unv: file related to GVT data from Wing A (See classification in R1 and R2)
		   - TestData_WingB.unv: file related to GVT data from Wing B (See classification in R1 and R2)
		   - TestData_WingC.unv: file related to GVT data from Wing C (See classification in R1 and R2)
		   - TestData_WingBWI.unv: file related to GVT data from Wing B Wash-in (See classification in R1 and R2)
		   - TestData_WingBWO.unv: file related to GVT data from Wing B Wash-out (See classification in R1 and R2)
							
	- FE Models
		Description: 
		Folder containing the models for each wing in both the original designs and updated designs (See classification of wings in R1 and R2).
		Note: These models are not the same presented in R1 and R2. Some parts have been modelled differently to improve the correlation with GVT.

		Folder structure:
			FE Models
				|
				|__ Original
				|	|__ Wing A
				|	|__ Wing B
				|	|__ Wing C
				|	|__ Wing BWI
				|	|__ Wing BWO
				|	|	|  ( Within each wing folder)
				|	|	|__ Mode Shapes: Folder containing images of the shapes correlated between the SOL103 in Nastran and the GVT data.
				|	|	|__ SOL103_WingXX.dat: simulation input .dat file used in Nastran for the modal analysis.
				|	|	|__ SOL144_WingXX.dat: simulation input .dat file used in Nastran for a static aeroelastic analysis. It provides the approximate position of the part of the wing exposed to the flow.
				|	|__ OriginalModelCorrelation.xlsx: Excel file containing the correlation information, including the modal assurance criterion table (MAC), correlation table withthe different modes involved and comments regarding which modes where excluded from the SOL103 analysis.
				|
				|__ Updated
					|__ Wing A
					|__ Wing B
					|__ Wing C
					|__ Wing BWI
					|__ Wing BWO
					|	|  ( Within each wing folder)
					|	|__ Mode Shapes: Folder containing images of the shapes correlated between the SOL103 in Nastran and the GVT data.
					|	|__ SOL103_WingXX_Update.dat: simulation input .dat file used in Nastran for the modal analysis.
					|	|__ SOL144_WingXX_Update.dat: simulation input .dat file used in Nastran for a static aeroelastic analysis. It provides the approximate position of the part of the wing exposed to the flow.
					|__ UpdatedModelCorrelation.xlsx: Excel file containing the correlation information, including the modal assurance criterion table (MAC), correlation table withthe different modes involved and comments regarding which modes where excluded from the SOL103 analysis.
