Rapid calculation method for power reserve margin of marine main engine

Abstract

The invention discloses a method for quickly calculating the power reserve margin of a marine main engine. The method comprises the following steps: defining a physical concept of the power reserve margin of the main engine; deriving a host standard power output curve formula; constructing a relational expression between the X-axis amount of the propeller light rotation allowance curve and the X-axis amount of the main engine standard output power curve according to the definition of the propeller light rotation allowance, and deducing a propeller light rotation allowance curve formula; constructing a relational expression between the X-axis amount of the ship tethered pile tension curve and the X-axis amount of the propeller light rotation allowance curve according to the ship tethered pile tension definition, and deducing a ship tethered pile tension curve formula; and substituting the ship mooring pile tension curve formula into the calculation formula of the power reserve margin in the main engine rotating speed forbidden zone, and deducing a rapid calculation formula of the power reserve margin in the main engine rotating speed forbidden zone. According to the method, the calculation method of the main engine power reserve margin is given quantitatively, and safety and stability of the ship are guaranteed.

Description

technical field [0001] The invention relates to the field of ship main engine power calculation, in particular to a fast calculation method for ship main engine power reserve margin. Background technique [0002] Affected by factors such as global warming and resource crisis, the International Maritime Organization (IMO) launched the ship energy efficiency design index EEDI. The entry into force of this bill has had a profound impact on the selection of ship main engines. Shipyards have chosen to reduce the power of the main engine to meet the requirements of EEDI. , When the main engine is used at reduced power, a series of problems have occurred, such as the time for the ship to pass through the restricted area of ​​the speed is too long. [0003] At this stage, the research on the problem of too long time for ships to pass through the restricted speed zone is still in the exploratory stage, and there is no clear parameter definition and corresponding calculation method. ...

AI Technical Summary

Problems solved by technology

When the ship needs to quickly pass through the speed restricted area or in severe sea conditions, if the main engine does not have enough power reserve, it will increase the time for the ship to pass through the speed restricted area and reduce the control performance of the ship, which will bring great safety hazards to the operation of the ship

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