CN-122029100-A - Two-axis four-rudder ship

Abstract

A steering control device (200) has a low-speed in-situ turning function unit that sets a pair of high-lift rudders (102 a, 102 b) corresponding to one propulsion propeller (101 a) to a reverse steering angle and sets a pair of high-lift rudders (103 a, 103 b) corresponding to the other propulsion propeller (101 b) to a forward steering angle, in a state in which left and right propulsion propellers (101 a, 101 b) are constantly rotated at a low speed in the forward direction, during low-speed-range ship steering.

Inventors

• Fuda Kazushi
• Fine Xuan and respect

Assignees

• 日本汉武西株式会社

Dates

Publication Date

20260512

Application Date

20241003

Priority Date

20231024

Claims (2)

1. 1. A two-axis four-rudder ship is characterized in that, A ship handling system provided with a thrust system and a control thrust system, The thrust system includes a pair of propeller shafts rotating in opposite directions, propulsion propellers provided on each of the propeller shafts and having a pair of opposite blade angles disposed on the stern, a pair of left and right high-lift rudders disposed behind each of the propulsion propellers, and a plurality of steering engines for driving each of the high-lift rudders, The ship control system is provided with a steering control device which controls the direction of the wake of each propulsion propeller by changing the combination of rudder angles of a pair of high-lift rudders corresponding to each propulsion propeller by operating each high-lift rudder independently at various angles by each steering engine in a state where the left and right propulsion propellers are constantly rotated in the forward direction, and controls the direction of the thrust acting around the stern of the ship body, The steering control device has a low-speed in-situ turning function unit that adjusts a pair of high-lift rudders corresponding to one propulsion propeller to a reverse rudder angle and a pair of high-lift rudders corresponding to the other propulsion propeller to a forward rudder angle in a state where the left and right propulsion propellers are constantly rotated at a low speed in the forward direction during the low-speed domain ship steering, and performs the in-situ turning ship steering.
2. 2. A two-axis four-rudder ship is characterized in that, A ship handling system provided with a thrust system and a control thrust system, The thrust system includes a pair of propeller shafts rotating in opposite directions, propulsion propellers provided on each of the propeller shafts and having a pair of opposite blade angles disposed on the stern, a pair of left and right high-lift rudders disposed behind each of the propulsion propellers, and a plurality of steering engines for driving each of the high-lift rudders, The ship control system is provided with a steering control device which controls the direction of the wake of each propulsion propeller by changing the combination of the rudder angles of a pair of high-lift rudders corresponding to each propulsion propeller by operating each high-lift rudder independently at various angles by each steering engine in a state where the left and right propulsion propellers are constantly rotated in the forward direction, controls the direction of the thrust acting around the stern of the ship body, The steering control device has a turning speed adjustment function unit that performs control to maintain a pair of high-lift rudders corresponding to one propulsion propeller at symmetrical rudder angles and increase or decrease the rudder angle in a reverse rudder angle range, and performs control to maintain a pair of high-lift rudders corresponding to the other propulsion propeller at symmetrical rudder angles and increase or decrease the rudder angle in a forward rudder angle range, and controls torque acting around the stern of the hull, in a state where the left and right propulsion propellers are constantly rotated in the forward direction, during low-speed-domain ship steering, and adjusts the turning speed during low-speed-domain ship steering.

Description

Two-axis four-rudder ship Technical Field The present invention relates to a biaxial four-rudder ship which is propelled by two shafts and has a pair of high-lift rudders at the rear of each propulsion propeller, and is a technology capable of realizing easy ship maneuvering. Background Conventionally, in a two-axis two-rudder ship shown in japanese patent application laid-open No. 2010-195302, for example, a pair of right and left propellers is provided in parallel to the rear portion of a ship body, a pair of right and left rudders is provided in parallel to the rear portion of the ship body at a position rearward of the pair of right and left propellers and toward the center side of the ship body, and the pair of rudders has a first guide surface on the opposite inboard side and a second guide surface on the non-opposite outboard side, so that the bulge in the outboard direction of the second guide surface is more prominent than the bulge in the inboard direction of the first guide surface. Further, in the biaxial ship shown in japanese patent laid-open publication No. 2012-35786, there is provided a pair of left and right skegs provided at the stern of the ship body at intervals in the ship body width direction, a pair of left and right propellers disposed at the rear ends of the skegs, and a pair of left and right rudders provided at the stern at positions rearward of the propellers, the rudders having movable fins extending in the ship body width direction and rotatable about axes. Disclosure of Invention Conventionally, two-axis two-rudder is often used for medium-high speed vessels such as ferries, passenger ships, inspection vessels, and the like, and shallow draft or wide cargo vessels. Since each propeller of the two-axis is rotated in the opposite direction on the inner side or the outer side, and the wake of the propeller is also a vortex in the opposite direction, the fluid force involved in steering the two-axis two-rudder ship is complex, and it is difficult to estimate the hull motion. In steering a ship, steering is facilitated by rotating the propeller of one shaft in the forward direction and the propeller of the other shaft in the backward direction, but reversing and steering of the main engine become complicated, so that there is a demand for improving the ship steering performance for directional control and speed control. In addition, steering is complicated when one main engine is not operated and only the other main engine is used for steering, and easy steering is required for a biaxial ship. As with the two-axis ship, there is also an example in which a pair of pod-type boosters are used at the stern. Although the steering performance of the ship is good by 360 degrees of rotation by the pod-type booster, on the other hand, since there is no rudder behind the propeller, the heading performance is kept low. The present invention has been made to solve the above problems, and an object of the present invention is to provide a biaxial four-rudder ship having excellent ship handling performance, which can easily perform direction control and speed control. In order to solve the above problems, the present invention provides a two-axis four-rudder ship comprising a thrust system and a ship steering system for controlling the thrust system, wherein the thrust system comprises a pair of propeller shafts rotating in opposite directions, propulsion propellers provided on the respective propeller shafts and having a pair of opposite blade angles disposed on the left and right sides of the stern, a pair of left and right high-lift rudders disposed behind the respective propulsion propellers, and a plurality of steering engines for driving the respective high-lift rudders, respectively, the ship steering system comprises a steering control device for operating the respective high-lift rudders independently at various angles in a state where the left and right propulsion propellers are constantly rotated in the forward direction, the steering control device controlling the direction of the wake flow of the respective propulsion propellers by changing the combination of the steering angles of the respective high-lift rudders corresponding to the respective propulsion propellers, controlling the direction of the thrust acting on the periphery of the stern of the ship body, and steering control means having a low-speed in-place turning-around function portion for steering the ship in a low-speed region, and steering the respective high-lift rudders in a state where the respective high-lift rudders are turned around in the forward direction, and the respective high-lift rudders are adjusted in a state where the respective high-lift rudders are turned around in the forward direction corresponding to the respective rudder angle. A two-axis four-rudder ship is characterized by comprising a ship control system provided with a thrust system and a control thrust system, wherein the thrust system is pr