Model Test with PMM

Installed in either the 90 Meter Ice/Towing Tank or the 200 Meter Towing Tank, the Planar Motion Mechanism (PMM) is used in maneuvering studies conducted in ice and open water. The PMM allows a model to move in exact, pre-programmed patterns while forces, moments and motion around the model are recorded. The PMM has maximum sway amplitude of ±4 meters, and a maximum sway velocity of 0.7 meters per second. The mechanism has an integral 4-component force dynamometer, which measures the hydrodynamic loads on the captive model. Computer controlled motors are used to control the yaw and sway axes as well as the main tow carriage. Standard tests such as static yaw and rudder sweeps, pure yaw and sway tests are most commonly conducted. The mechanism can also simulate an arc of a rotating arm. On-the-fly analysis procedures allow maneuvering derivatives to be calculated while testing proceeds. Using these derivatives, all the standard maneuvers required by IMO can be simulated on a desktop. Alternatively, the derivatives may be incorporated into the Centre for Marine Simulation Ship Bridge Simulator. Standard resistance and propulsion experiments can also be undertaken while the model connected to the PMM to maximize experimental efficiency.

Note: full 360° rotation possible, full digital control, any motion may be programmed.

Related Projects:

• Tailbuoy - Tests on the PMM.