What happen if two ships travel in the proximity of one another?
Then you have to be careful!
The hydrodynamic interactions between vessels may draw the two ships close to each other and result in collision:
Therefore, we conduct experimental studies on the hydrodynamic interactions (loads, motions) between vessels in the overtaking maneuver, in which one ship goes pass another with higher forward speed.
The model ship to be overtaken
The moment during overtaking maneuver
Set-up before experiment
The moment right after overtaking maneuver
Design and fabrication of wireless ultrasonic wave probe
Measurements of free-surface waves are valuable validation references for the computational modeling of marine structure and floating bodies. Traditional free-surface measurements are usually taken by capacitor-type wave probes partially immersed in the water:
Wave probes on cantilever boom
Wave probe placement at the towing tank
The problem is, we have to hang the wave probes on a cantilever boom installed on one side of the towing tank, which significantly restricts the allocation of wave probes and measuring sites. Therefore, we came up with a wireless, ultrasonic-based wave probe design, which measures the free-surface elevations by ultrasonic sensors like
HC-SR04, and hooked it up with Arduino Nano. The result? A satisfactory, reliable and above all, inexpensive wireless measurement solution!
Ultrasonic wave probe at the stern of overtaken model ship
Sensor module of the ultrasonic wave probe
Ultrasonic wave probes during experiment
Receiver module
Sensor module
Arrangement of sensor and receiver module of the ultrasonic wave probe