August 17, 2017 WEC-Sim Training Course · 2021. 1. 8. · 1 | Program Name or Ancillary Text...
Transcript of August 17, 2017 WEC-Sim Training Course · 2021. 1. 8. · 1 | Program Name or Ancillary Text...
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WEC-Sim Training Coursefor users and developers
FOSWEC wave tank testing and WEC-Sim simulation
August 17, 2017Yi-Hsiang Yu (NREL)Kelley Ruehl (Sandia)
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Course Agenda
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Time (MT) Topic (~Duration) Description11:00 am WEC-Sim Code Structure
~1hr total• Code Structure Overview: ~10min
• WEC-Sim source code• WEC-Sim models: input files and Simulink models
• WEC-Sim Objects (.m): ~30min• Object oriented programming: objects, properties, methods, etc.• High level overview of: bodyClass, waveClass, simulationClass, ptoClass,
constraintClass, mooring, etc• WEC-Sim Library Blocks (.slx): ~20min
• body, constraint, pto, frame• what simulink blocks are available, how are they defined• what is a mask, how to go under a mask• variant subsystems and how to define them
Code Structure Topics
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WEC-Sim Code Structure Kelley Ruehl (Sandia)
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WEC-Sim source code consists of:
WEC-SimWEC-Sim/source/
WEC-Sim model files consist of: Case Directory
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WEC-Sim Source Code
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WEC-Sim Source Code
WEC-Sim source code consists of:
– Source code is included in the MATLAB path– Can be executed from any directory
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• Executing wecSim.m– parses the WEC-Sim input file– performs preprocessing calculations in each of the classes– selects and initializes variant subsystems in the Simulink model– runs the time-domain simulation in WEC-Sim
• View wecSim.m from MATLAB Command Window>>open wecSim
WEC-Sim ExecutableWEC-Sim/source/WEC-Sim/source/wecSim.m
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• Define classes in the WEC-Sim input file– wecSimInputFile.m
• The following classes create the WEC-Sim objects– simulationClass.m, waveClass.m, bodyClass.m,
constraintClass.m, ptoClass.m, mooringClass.m• WEC-Sim objects are required to run WEC-Sim simulations
– simu, waves, body(i), pto(i), constraint(i), mooring(i) • View properties or open classes from MATLAB Command Window
>> doc className>> open className
WEC-Sim Objects
WEC-Sim/source
WEC-Sim/source/objects
WEC-Sim/source/objects/
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• WEC-Sim source code includes WEC-Sim library blocks:– Body Elements, Constraints, Frames, Moorings, PTOs
• Define WEC dynamics in WEC-Sim Simulink model using WEC-Sim Library Blocks– <Simulink_modelname>.slx
• View properties by double clicking on blocks– displays description and block parameters
• There should be a one-to-one between the objects defined in the input file and the blocks used in the Simulink model.
WEC-Sim Library BlocksWEC-Sim/source/lib/ WEC-Sim/source
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WEC-Sim Model Files
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WEC-Sim Model Files
WEC-Sim model files consist of:
• Model files are located in the case directory• WEC-Sim models must be executed from the case directory
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wecSimInputFile.m
WEC-Sim Input FileCase Directory
• Located in the case directory• Initialize and define classes in the WEC-Sim input file
– wecSimInputFile.m• WEC-Sim objects are required to run WEC-Sim simulations
– simu, waves, body(i), pto(i), constraint(i), mooring(i)
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– Initialize Simulation Class– Set Properties of Simulation Class
WEC-Sim Input File
wecSimInputFile.m
– Initialize Constraint Class– Set Properties of Constraint Class– Initialize PTO Class– Set Properties of PTO Class
– Initialize Wave Class– Set Properties of Wave Class
– Initialize Body Class Instances– Set Properties of Body Class Instances
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<Simulink_model_name>.slx
WEC-Sim Simulink File
Case Directory
• Located in the case directory• Define model file using WEC-Sim Library Blocks
• <Simulink_model_name>.slx
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WEC-Sim Simulink File
– Body Block
<Sim
ulin
k_m
odel
_nam
e>.s
lx
– Translation PTO Block
– Body Block
– Floating (3DOF) Block
– Global Reference Fram
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WEC-Sim Objects
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• Define classes in the WEC-Sim input file– wecSimInputFile.m
• The following classes create the WEC-Sim objects– simulationClass.m, waveClass.m, bodyClass.m,
constraintClass.m, ptoClass.m, mooringClass.m• WEC-Sim objects are required to run WEC-Sim simulations
– simu, waves, body(i), pto(i), constraint(i), mooring(i)
WEC-Sim Objects
WEC-Sim/source
WEC-Sim/source/objects
WEC-Sim/source/objects/
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• WEC-Sim has several different classes– simulationClass.m– waveClass.m– bodyClass.m– constraintClass.m– ptoClass.m– mooringClass.m– responseClass.m
• Each class contains:– Properties that can be defined– Methods (aka functions) that can be executed
• WEC-Sim input file determines which properties are defined and methods are executed
WEC-Sim Objects
OBJECT
PROPERTIES METHODS
INITIALIZATION OTHER
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• Each class creates a corresponding object– simulationClass.m simu– waveClass.m waves– bodyClass.m body(i) – constraintClass.m constraint(i) – ptoClass.m pto(i) – mooringClass.m mooring(i) – responseClass.m output
• Properties defined in the WEC-Sim input fie used initialize variant subsystems in the WEC-Sim Library Blocks– simu.b2b = 1;– body(i).nhBody = 1;– waves = waveClass('regular');
WEC-Sim Objects
OBJECT
PROPERTIES METHODS
INITIALIZATION OTHER
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• WEC-Sim Classes– simulationClass.m– waveClass.m– bodyClass.m– constraintClass.m– ptoClass.m– mooringClass.m– responseClass.m
WEC-Sim Objects
OBJECT
PROPERTIES METHODS
INITIALIZATION OTHER
>> doc ptoClass
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• WEC-Sim Classes– simulationClass.m– waveClass.m– bodyClass.m– constraintClass.m– ptoClass.m– mooringClass.m– responseClass.m
WEC-Sim Objects
OBJECT
PROPERTIES METHODS
INITIALIZATION OTHER
>> open ptoClass
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WEC-Sim Class Descriptions
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Simulation Class
The simulation class contains the simulation parameters and solver settings necessary to execute the WEC-Sim code.• Required Properties:
– simMechanicsFile– startTime, endTime, dt, rampTime, CITime– (many have default values)
• Optional Properties:– ssCalc, nlHydro– mode, solver– explorer, paraview, domainSize– rho, g
• Contains all simulation options (time, fluid properties, solver, visualization, etc.)
• Contains flags for different options (state space, non-linear hydro, etc.)
simulationClass.m >>simu
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Wave Class
The wave class contains all wave information necessary to define the incident wave condition for the WEC-Sim time-domain simulation. • Required Properties:
– type– Each wave ‘type’ has different required properties
waveClass.m >>waves
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Body Class
The body class contains the mass and hydrodynamic properties of each body that comprises the WEC being simulated.• Required Properties:
– mass: value, ‘equilibrium’, ‘fixed’– momOfInertia (except for ‘fixed’ mass)– geometryFile– h5File
• Optional Properties:– viscDrag– initDisp– linearDamping– Viz
• Useful input information:– hydroData (BEM data)– hydroForce (force time-series)
bodyClass.m >>body(1)
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Constraint and PTO Classes
Constraint blocks connect WEC bodies to on one another (and possibly to the seabed) by constraining DOFs. • Constraint Class Properties
– name– Loc
constraintClass.m
ptoClass.mPower Take-Off (PTO) blocks connect WEC bodies to one other (and possibly to the seabed) by constraining DOFs and applying linear damping and stiffness• PTO Class Properties
• name• loc• k• c
• NOTE: loc required for rotational PTOs & Constraints
>>constraint >>pto
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Mooring Class
Mooring class contains all information about definition of the mooring system• Mooring types:
– Matrices– MoorDyn
• Properties:– name– ref– matrix– initDisp– moorDynLines
mooringClass.m >>mooring
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Response Class (Output Structure)
‘output’ created at the end of a WEC-Sim simulation. It contains all the output time-series and methods to plot and interact with the results. • `output` variable = responseClass instance
– Contains all time series from simulation– Contains all time-series calculations– methods for quick plotting
• Properties:– bodies– ptos– constraints– ptosim
$Case/output/RM3_matlabWorkspace.mathttp://wec-sim.github.io/WEC-Sim/code_structure.html#output-structure
responseClass.m>>output
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WEC-Sim Library
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• WEC-Sim source code includes WEC-Sim library blocks:– Body Elements, Constraints, Frames, Moorings, PTOs
• Define WEC dynamics in WEC-Sim Simulink model using WEC-Sim Library Blocks– <Simulink_modelname>.slx
• View properties by double clicking on blocks– displays description and block parameters
• There should be a one-to-one between the objects defined in the input file and the blocks used in the Simulink model.
WEC-Sim Library BlocksWEC-Sim/source/lib/ WEC-Sim/source
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WEC-Sim Library
• WEC-Sim Library– Drag & Drop library – Mask
• Simulink Model– Made of WEC-Sim library blocks– Body Elements, PTOs,
Constraints need to be numbered
WEC-Sim/source/lib/
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Masks
• Simulink Masks– A mask is a custom user interface for a
block.– By masking a block you encapsulate the
block diagram to have its own parameter dialog box with its own block description, parameter prompts, and help texts.
• Denoted by down arrow• Double clicking on mask opens
dialog box• Clicking on down arrow (Ctrl+U)
goes under the mask
WEC-Sim/source/lib/
https://www.mathworks.com/help/simulink/block-masks.html
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Variant Subsystems
• Variant Subsystems– Variant subsystems let you provide
multiple implementations for a subsystem where only one implementation is active during simulation.
– You can programmatically swap out the active implementation and replace it with one of the other implementations without modifying the model.
• Denoted by double squares• Double click on subsystem to view
variant subsystem (unless masked)
WEC-Sim/source/lib/
https://www.mathworks.com/help/simulink/examples/variant-subsystems.html
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Variant Subsystems
• WEC-Sim Library Blocks contain many variant subsystems which are activated by WEC-Sim input file, wecSimInputFile.m in wecSim.m
• Right click on block with variant subsystem and select ‘Block Parameters (Subsystem)’ to see variant control variables
WEC-Sim/source/lib/
https://www.mathworks.com/help/simulink/examples/variant-subsystems.html
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Variant Subsystem and Mask Example
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WEC-Sim Library Block Types
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Body Elements
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Constraints
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Frames
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Moorings
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PTOs
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WEC-Sim Simulink Model– Created with WEC-Sim Simulink Library Blocks– Body Elements, Constraints, Frames, Moorings, PTOs
WEC-Sim Simulink File<Simulink_model_name>.slx
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In conclusion…
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CAD Mesh
BEM Solver (WAMIT, AQWA,
NEMOH)
BEMIO
PTO-Sim Input File
ptoSimClass
wecSim.m
User defined function
hdf5 file
WEC-Sim Input file
Simulation
Body
Waves
Constraint
PTO
Mooring
Non-linear hydro
Visualization
Runs Simulink model, calls user-defined functions for output processing
SimulinkModel
Reference frame block
Body block(s)
Constraint block(s)
PTO block(s)
Mooring block
PTO-Sim Block
Position, velocity,
acceleration, forces, etc. time series
Processes outputs, plots specified
variables
Variant sub-system
triggers
Output
MoorDyn
= External
= WEC-Sim distribution
= Required input= Optional input
stl file
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All the webinar materials and recordings are available online: http://wec-sim.github.io/WEC-Sim/webinars.html
Thank you!
Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly ownedsubsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.