Ship Maneuvering System with Redundant Output Control
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Solution Overview
Problem
Existing ship maneuvering systems fail to allow ship turning when the turning control device malfunctions, rendering it impossible or extremely difficult to operate the ship.
Innovation Solution
A ship maneuvering system that includes a turning operation device, a turning control device, an output operation device, and an output control device, where the output control device differentiates the power source outputs of multiple ship propulsion machines based on the turning operation signal from the turning operation device to enable ship turning even when the turning control device fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turning control device is used to control ship propulsion machine direction, then the ship can be turned normally, but when the turning control device fails, it becomes impossible or extremely difficult to turn the ship
Solution Approach 1:
The output control device, originally designed solely for controlling propulsion output, is enhanced to perform dual functions: it continues to control output while also serving as a backup turning control mechanism when the turning control device fails. This multi-functionality ensures ship turning capability is maintained without adding separate backup systems.
Solution Approach 2:
The system incorporates a failure detection mechanism that proactively identifies turning control device failures before they become critical. Upon detection, the system automatically switches to the alternative control mode using the output control device, preventing complete loss of turning capability and ensuring continuous safe operation.
2Ease of operation
If the output control device controls power source output, then the propulsion output can be adjusted, but it cannot control ship direction when turning control device fails
Solution Approach 1:
The output control device is designed to perform multiple functions: it controls the power source output under normal conditions and simultaneously serves as a turning control mechanism when the turning control device fails. This eliminates the need for separate backup systems and simplifies the overall control architecture.
Solution Approach 2:
The control system dynamically adapts its operation mode based on the operational status of the turning control device. When the turning control device is functional, the system operates in normal mode with dedicated turning control. Upon detection of failure, the system dynamically switches to an alternative mode where the output control device assumes turning control functions, ensuring continuous operational reliability.
Data Source
AI summary
There is provided a ship maneuvering system including: a turning operation device configured to output a turning operation signal corresponding to a turning operation; a turning control device configured to change a direction of each of ship propulsion machines based on the turning operation signal; an output operation device configured to output an output setting signal indicating an output of a power source of each of the ship propulsion machines set by an output setting operation; and an output control device configured to increase or decrease the output of the power source of each of the ship propulsion machines based on the output setting signal. When the turning control device fails, the output control device turns a ship by making outputs of power sources of the ship propulsion machines different from each other based on the turning operation signal.