This subset of data that will ultimately be collected from industry projects funded by DOE includes:
numerical models and predictions, device specifications, and validation data obtained under the DOE
award.
Cost and Time Estimates
Provide a time and cost estimate for the tank tests that were completed.
Numerical Models and Performance Predictions
Please provide numerical models which were used to model the subscale physical model that was tank
tested under the award. Include description of approach and modeling tools, equations of motion,
input and output files, power predictions, power curves, etc.
Validation Data
Facility Information
Facility and Logistics Information
Type
Dimensions
Beach and reflection characteristics
Calibration data
Wave maker specifications and calibration
Details
E.g. Basin or Flume
Length, width, depth, etc.
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Sample Rate
A minimum data sample rate of 100 samples per wave period (T) should be used for all measurements.
In some cases a higher data sample rate may be required and the required sample rate should be
determined on a case-by-case basis.
Time Synchronization
It is very important that all data gathered is time synchronized. If measurements are not in sync,
comparing numerical and experimental data is possible in the frequency domain, but problematic in the
time domain. Frequency domain validation is less robust than time domain validation.
Wave Measurement Requirements
The waves that are generated determine the hydrodynamic forces on the device. WEC devices are
generally tested in regular and irregular waves and both types of waves must be accurately
characterized. At minimum, a single wave gauge upstream and downstream of the device is required.
Wave measurements
Height
Period
Details
Time resolved
Time resolved
Water depth
Directional wave spectra
Water current velocity
Wave orbital velocity
Wave propagation direction
For irregular waves
If applicable
If available
With respect to the device orientation
Video Monitoring
If possible, tests should be video recorded.
Body Motions and Forces
Body Motions and Forces
6 degree-of-freedom motion
Initial condition
Wave pressure force
Accelerometers
Tilt sensors or rate sensors
Relative position measurement (if
applicable)
Details
Time resolved surge, sway, heave, roll,
pitch, yaw and derivatives
Device location with respect to other
devices, device heading, etc.
On submerged parts of bodies
Time resolved accelerations of each body
Time resolved rate of rotation of each
body
Time resolved potentiometer readings
PTO System Performance
PTO System Performance
Forces and torques
Velocity of the PTO system
PTO position (rotary or linear)
Electrical Power measurements (if
applicable)
Details
In radians for rotary generators and m/s
for linear generators
If the PTO system has maximum limits of
motion the position of the PTO system
should be recorded and measured
Voltage, Current, Power, etc. Power
measurements may need to be in the kHz
frequency range -
Mooring System Performance
Mooring System Performance
Details
Tension in each mooring line
Mooring attachment angle at the mooringdevice connection point
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Device Specifications
Structural Specifications
Component description
Details
CAD drawings of all device
components
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Mass
-
Center of mass
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Moment of inertia about the center
of mass
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Device scale
1:25 – 1:100 for most devices
Active or passive geometry control
If the geometry is changed during testing, details
should be provided. For example, if the ballasting is
changed modified to change the natural frequency
of the device.
Hydrodynamic drag coefficients
If available. Literature values can be used or CFD
simulations can be run to estimate these
coefficients if necessary.
Decay Tests (Pluck Tests) with and
without mooring attached
Time resolved tests capable of obtaining the
natural resonance and decay parameters in each
obtainable DOF. Should be repeated with and
without the mooring.
PTO System Specifications
Component description
General specifications
Damping and stiffness values
Control strategy
Details
Mass, moment of inertia, rotation rate at different
power outputs, etc. This will be important to
consider if PTO gyroscopic effects influence device
motions.
If the PTO system settings are changed during a
single test, details on the PTO system control
strategy are needed.
Dynamic Calibration Curves
The dynamic characteristics of the tested PTO
should be calibrated before integration into the
device.
Mooring System Specifications.
Component description
Details
Configuration
Line lengths, weight, stiffness, device connection
points, seafloor connection points, etc.
Stiffness and damping matrices
Stiffness vs. displacement matrix and damping vs.
velocity and displacement. Note: this is only
needed if other mooring specifications are not
provided
Calibration curves
Experimentally measured versions of the stiffness
and damping matrices detailed above.
Anchor specifications
Type, mass, holding force, etc.