Latest GNSS technology

Ship motion measurements are undertaken using high-accuracy GNSS receivers or inertial systems. We have undertaken 6-degree of freedom ship motion measurements on 60 cargo ship transits, using dual-frequency GNSS receivers with error of 10-20mm.

Types of measurement

• Ship under-keel clearance
• Ship wave-induced motions
• Moored ship motions and loads
• Boat wake
• Cavitation and ventilation
• Flow-induced vibration

Theory and experiment

Numerical modelling helps to understand sea trials data, and sea trials help to validate numerical modelling. Perth Hydro is at the international forefront of ship motions numerical modelling and full-scale validation.