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Marine & Nautics with RTMaps
OVERVIEW
In famous yacht races, gaining a few percents in pure performance, or optimizing the behaviour of an autopilot system can turn out to be a major asset for final victory.
As sailboats evolve in a dynamic environment, and at the boundary between two fluids (water and air), they are subject to numerous efforts of different kinds. Understanding perfectly the way such efforts apply and what effect they have on the yacht performance is a very challenging issue.
RTMaps offers the capability to gather all the high frequency and high bandwidth data from numerous and heterogeneous sensors placed all over a sailboat in a synchronized manner, including video cameras, and so can help understand the behaviour of the whole system and optimize the sailboat settings, either manually after post-analysis of recorded scenarios, or automatically in real-time when running an autopilot.
HIGHLIGHTS
- Supported sensors like:
- Video cameras (for team coordination studies, sails shape studies…)
- GPS
- IMUs (X-Sens, SBG, IXSEA, Crossbow, Microstrain, VectorNav…)
- Analog and digital I/Os (strain gages, displacement, coding wheels…)
- Anemometers (Windmaster 3D ultrasonic anemometer, etc.)
- Any kind of marine NMEA sensor over serial or Ethernet (loch, compass, etc.)
- Audio
- And much more
- Datalogging and event-based pre-triggered recording
- Real-time processing
- Real-time synchronized playback
APPLICATION EXAMPLES
PERFORMANCE ANALYSIS
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The RTMaps capability to record numerous different sensors data streams (including videos) in a synchronized manner provides a way to understand offline, at playback, which kind of settings and environment conditions lead to which kind of performance.
Furthermore, it is possible in a few clicks to synchronize the main RTMaps time base on an external absolute clock such as UTC time provided by a simple GPS sensor. This way, two (or more) identical (or not) sailboats equiped with RTMaps can perform synchronized datalogging allowing to study afterwards which options were better, which team performed better, etc.
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NUMERICAL MODEL IN DYNAMIC ENVIRONMENT (IRENAV - French Naval Academy)
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Yacht Sails Fluid Sructure Interactions Models with RTMaps
The IRENAV team from the French Naval Academy in Brest uses RTMaps to perform timestamped datalogging of numerous signals onboard a J-80 yacht in order to validate a numerical model of the rigging in dynamic environment.
The RTMaps based datalogger handles various heterogeneous sensors such as 4 video cameras, a GPS, a Xsense IMU, a 3D ultrasonic anemometer, numerous load sensors, a loch, etc. and is operated under tough sailing conditions.
Part of the measurements are then used to feed the numerical model, while others are used for its validation.
Click to read the Experimental full scale study on yacht sails and rig under unsteady sailing conditions and comparison to fluid structure interaction unsteady models (english version) - By : Benoît Augier, Research Institute of the Naval Academy, Patrick Bot, Research Institute of the Naval Academy, Frederic Hauville, Research Institute of the Naval Academy - IRENav, France
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References
Mer Agitée (Team FONCIA)
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Ecole Navale (IRENAV)
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Instituto Politecnico di Milano
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