• Performance Coefficients
• On-Board KPI Trending
• Emissions Monitoring
• Integrated MetOcean Data

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Performance Coefficients

In depth analysis can be used to monitor the performance of a ship and to indicate how much additional power, or fuel, is required as a consequence of the combined effects of weather and fouling or of the isolated effects of fouling on the hull or propeller. Such analysis enables data trending which can be used to optimise the scheduling of hull and propeller cleaning events and can be subsequently used to quantify the effectiveness of any such events.
To carry out the analysis, sophisticated filtering is applied to the ship data in order to exclude the effects of shallow water, acceleration, deceleration and manoeuvring. Furthermore, in order to reduce data scatter and improve the accuracy of analysis, additional filters can be applied.

Analysis Filters

• Load Condition
  (Draughts and Trim)
• Operation
  (Log Speed, Shaft RPM and Shaft Power)
• Environment
  (Wind, Wave and Current)

In BMT SMART^SERVICES, five Performance Coefficients have been developed to trend the performance of the ship, each with its specific use. Industry standard hydrodynamic understanding is used in the formulations of the Performance Coefficients giving optimal distinction between the physical effects under consideration.

• Power Coefficient
  The Power Coefficient is used to monitor the propulsive power that is absorbed by the propeller. Increased power absorption, due to the effect of fouling on the ship’s hull or propeller for example, is directly reflected in an increase of the power coefficient.
• Hull Coefficient
  The Hull Coefficient gives the relationship between the shaft rate of revolutions and the ship speed. This provides a measure of changes to the hulls condition due to fouling, for example, over time.
• Propeller Coefficient
  The Propeller Coefficient is used to monitor the efficiency of the propeller. It isolates the performance of the propeller and indicates the propulsive efficiency of the propeller.
• SFOC (Specific Fuel Oil Consumption) Coefficient
  The SFOC Coefficient is a measure of the fuel consumption of the main engine and is direct indication of engine efficiency.
• FOC (Fuel Oil Consumption) Coefficient
  The Fuel Coefficient has similar features and characteristics as the power coefficient, but it highlights the overall changes to fuel consumption by including the efficiency of the main engine.

How are Performance Coefficients Used?

Within SMART^ACCESS users have the ability to perform data analysis through the Analysis Module. The data can also be filtered, to limit the operational envelope for analysis. The results provide clear performance trends and can be used to demonstrate changes in performance over time. This is particularly useful when trying to quantify the effects maintenance events such as a hull scrub or propeller polish.