RU1840773C - Detector of vessel or platform location variation - Google Patents

Abstract

FIELD: hydroacoustic engineering.

SUBSTANCE: invention is related to the field of hydroacoustic engineering and may be used in vessels or platforms of marine used for salvage operations. Technical result is achieved due to application of hydroacoustic Doppler lag as detector of vessel or platform location variance.

EFFECT: device fast-action and cost reduction.

1 dwg

Description

A device for automatically holding a ship (or platform) at a given point in the sea can be used on ships of the navy (or platforms) designed for rescue operations that ensure the actions of bathyscaphes, etc.

A device is known in which a sonar bottom transponder is used as a sensor of information about the movement of the vessel relative to the bottom of the sea, the pulsed signals of which are received by the ship's onboard sonar equipment (or platform), which contains several spaced apart relative to the other (for example, three) hydrophones and -amplifier path, allowing to determine the location of the ship relative to the transponder beacon based on the difference in the signal arrival time. The received information is sent to the ship’s (platform) automatic containment system, in which commands are generated to control the ship’s main engines (in the direction of the ship) and the ship’s auxiliary engines (in the direction perpendicular to the ship). (See the article ″ Vessel Positioning Control Systems ″ magazine "Under Sea Technology", USA, 1967, April, Vol.8 No. 4 p.12).

The disadvantage of the above device is the need for pre-installation and observation of the bottom beacon-responder in the area where you need to ensure the retention of the vessel (or platform) at a given point, which requires material costs and time. It should also be noted that the service life of the transponder beacon is limited by its low energy supply, and the transponder beacons currently in use do not rise to the surface and are referred to as single-use equipment.

The aim of the invention is to ensure the speed of the device for automatically holding the vessel (or platform) at a given point in the sea and its cost.

This goal is achieved by using as a sensor information about the movement of the ship (or platform) of a standard hydroacoustic Doppler lag, stationary mounted on the vessel (or platform).

A block diagram of the proposed device for holding the vessel at a given point of the sea is shown in the drawing.

The Doppler sonar log (1) is connected to a device that converts the sensor signals into engine control signals (2), which are transmitted to the device for automatic control of the longitudinal (3) and transverse (4) engines of the vessel (or platform).

The hydro-acoustic Doppler lag, in particular commercially available by the LA-1 industry, gives the longitudinal (V _x ) and) transverse (V _y ) velocity component in the ship coordinate system at the output. These values are presented as binary code. They enter a device for converting lag signals to engine control signals (or to a digital computer). The lag information is converted into automatic control signals for the longitudinal and transverse propulsion of the vessel. Movers create persistent forces in the longitudinal and transverse directions, directed counter to the disturbing forces, and bring the ship to its original position.

The battle signal, proportional to the thrust of the propulsors in the longitudinal direction, has the following form:

where δ _x is the total control signal in the longitudinal direction;

x is the deviation in the longitudinal direction (can be obtained in the computer by integrating V _x );

x _ass - a given deviation in the longitudinal direction;

V _x is the longitudinal component of velocity obtained from the absolute lag;

- ускорение корабля в продольном направлении (может быть получена в ЦВМ дифференцированием V_x);

- the acceleration of the ship in the longitudinal direction (can be obtained in a digital computer by differentiation V _x );

K _x - regulation coefficient that determines the effect of deviations along the x coordinate on the amount of emphasis;

- коэффициент регулирования, определяющий влияние скорости корабля в продольном направлении на величину упора;

- regulation coefficient that determines the influence of the ship's speed in the longitudinal direction on the amount of emphasis;

- коэффициент регулирования, определяющий влияние ускорения в продольном направлении на величину упора;

- regulation coefficient that determines the effect of acceleration in the longitudinal direction on the amount of emphasis;

R_n - обратная связь, пропорциональная проекции результирующего упора на ось.

R _n - feedback proportional to the projection of the resulting emphasis on the axis.

Similarly, the y coordinate equation can be represented.

LITERATURE

Under Sea Technology Magazine 1967, No. 4, pages 12-13, ″ Vessel Positioning Control Systems ″.

Claims (1)

The use of hydroacoustic Doppler log as a sensor for changing the location of a vessel or platform.