Ocean Systems Product Offerings 

  Performance Monitoring

Ship's performance efficiency deteriorates over time due to increased hull and propeller roughness. Fuel consumption may increase due to lack of engine maintenance or occasional bad fuel quality.  OSI's Performance Monitoring and Analysis system provides a tool for ship's crew as well as shore-side management to assess the long term ship performance by comparing her past voyages and other ships in the same class. 

Management can use the performance trend to spot abnormal conditions to alert ship's crew for further investigation of the causes. Ship's crew can use the daily information to achieve vessel's optimum performance.

The system is build on top of a Microsoft Access Data Base.  The ship's position, speed, Propeller RPM, Horse Power Output and  Fuel/Lub oil consumptions are entered on regular intervals automatically via Voyage Data Recorder or manually by crew.

The build-in algorithm "normalizes" the effects due to weather and draft by comparing the performance to the base conditions which were derived from trial/model test data and naval architecture theory (the same model is used in OSI's ship weather routing system).  

By calculating the "True Slip" from the ship's propeller curves, deterioration of hull, propeller and engine efficiencies can be identified and plotted over time along with other useful performance measures such as Tons per mile and Specific Fuel consumption etc.  These performance trends can help shore-side management spot inefficient ships and plan maintenance schedules.

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Example of hull efficiency degradation as shown by the True Slip over time

Example of hull roughness increase due to bad paint