A way of passing the zone of critical ship speed of the internal combustion engine with controllable pitch propeller


G05D13/66 - Governor units providing for co-operation with control dependent upon a variable other than speed

 

(57) Abstract:

Use: management wintermantel complex predominantly large ships. The essence of the invention: an area of critical revolutions take place in three stages, the first at the screw speed of the lower border of the zone to reduce the pitch to the amount at which the stop screw is equal to zero (the directional position of the propeller blades), at the second stage when the number of revolutions of the screw within the zone reduce the pitch to a value that ensures stability of the compositions of the current speed on the pitch and in the third stage, when the screw speed corresponding to the upper boundary of the zone, the pitch is increased to the value corresponding to this speed on combinatorial diagram according to step on the number of turns. 1 Il.

The invention relates to systems for remote automated control (DAU) main ship engines (DG) running on the propeller controllable pitch.

Known systems DAU, excluding static work of the state Duma in the zone of critical speed and providing a known method of automatically passing zone (Ovsyannikov, M. K. Petukhov Century A. Marine diesel lips

This method of passing zone critical speed, used almost the vast majority of existing systems DAU, provides a dramatic increase in the fuel supply upon reaching a speed lower limit of the zone at a fixed pitch corresponding to the lower limit of the zone.

Accelerated passage area by this method is achieved by maximizing the torque of the motor, but the voltage from the torsional vibrations may exceed the maximum permissible more than twice that contradict the Rules of the Register of the USSR". Limitation of fuel reduces the disturbing force, but increases the time zone.

It is also known a device for implementing other way of passing zone, characterized by a smooth change in the power and torque of the engine at the border zone and its passage when changing the pitch of the screw [1] .

In the process of passing zone the current value of the pitch is reduced with increasing speed, maintaining a constant engine power corresponding to the average speed and average step screw for the zone.

In this case, set the engine's creatures is reduced.

However, during the passage zone of the propeller has a significant time-dependent resistance medium speed zone and the average pitch of the screw, so that the time zone is greater than the first method. However, it is known that the voltage from the resonant torsional vibrations are rising because of increasing disturbance torque, and, to a certain extent, with increasing time work in the area of resonance. The influence of the latter factor leads to the fact that as a result, the voltage level from the torsional vibrations in the area of resonance may exceed the maximum allowable values.

The aim of the invention is to reduce the travel time zone critical speed and the reduction of stress from the torsional vibrations in the parts of the engine and shafting, which increases the operational reliability of the entire propeller planes of the complex.

This objective is achieved in that a method of passing zones critical ship speed of the internal combustion engine with controllable pitch propeller, which consists in changing the pitch of the screw, depending on its speed, at the first stage when the screw speed lower limit of the zone Cree is icenii the number of revolutions of the screw within the zone of critical speed decrease step screw size, ensuring the constancy of the product of step screw on the current value of the number of revolutions within the zone of critical speed, and at the third stage, when the screw speed, the corresponding upper value area of critical speed, the step size of the screw increases in accordance with the diagram of dependence of pitch on the number of turns.

In the end minimizes the resistance of the screw in the whole range of the critical speed, reducing the time zone of critical speed and decrease the voltage from torsional vibrations.

The drawing shows a diagram of the step N of the screw from the number of revolutions n (combinatorial chart) coated with idealized line adjustments. At site OA the pitch is equal to zero. At the point A - idle mode with zero stop. With increasing speed of the pitch change on the AC line. . . BF and with further increase of speed is one of several curves, which are selected depending on the loading of the ship and sailing conditions.

Area of critical speed (shaded) is limited to the lower nWITHand the upper nINthe momentum. The corresponding points on the graph: C and b Step screw on Combi which begins as follows. The zone of critical speed are under idealized line CDEB.

At the first stage CD on reaching the number of revolutions nCthe lower limit of the zone of critical speed decrease step screw up the values of HDcorresponding to the directional position of the propeller blades, in which the stop screw is equal to zero, and the moment of resistance of the screw to the current speed of the vessel is minimal. In a second step, as the number of revolutions of the screw within the zone of critical speed range of nCto nBthe pitch is reduced from the values of HDto the value of HEinversely proportional to the number of revolutions n, i.e., maintaining the ratio of H n = const.

Because during this time the speed of the vessel will remain the same, this condition corresponds to the directional or close to it the position of the blades, thus at this stage is to minimize the resistance of the screw.

After the number of revolutions of the screw reaches the value of nBat the third stage, EB, step screw increases from HEto HBcorresponding to the number of revolutions nBby Raman diagram of dependence of pitch on the number of turns.

The proposed method due to the minimum moment of saprotama, consequently the amplitude of the resonance of torsional vibrations in no time increase to dangerous values, which improves the reliability of the main engine and the safe navigation, especially in ice sailing conditions, when the main engine of long-operates with variable modes near the zone of critical turnovers and forced to repeatedly pass through the area in both directions.

A way of PASSING the ZONE of CRITICAL SHIP SPEED of the INTERNAL COMBUSTION ENGINE WITH CONTROLLABLE pitch PROPELLER, which consists in changing the pitch of the screw, depending on its speed, characterized in that, to reduce the travel time zone critical speed and reduce stresses due to torsional vibrations in the crankshaft of the engine, at the first stage when the screw speed lower limit of the zone of critical speed decrease step screw to the amount at which the stop screw is equal to zero, in the second stage, when the number of revolutions of the screw within the zone of critical speed decrease step screw size, ensuring the constancy of the product of step screw on the current value of the number of revolutions within the zone of critical speed, and at the third stage, when the screw number of obrotowy with the diagram of dependence of pitch on the number of turns.

 

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