Portable Vessel Stability Sensor Using Roll Period Analysis
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Solution Overview
Problem
Current ship stability assessment systems are expensive, cumbersome, and require significant training, making it difficult to quickly and accurately determine vessel stability, especially in situations like search and rescue or law enforcement operations where prior knowledge of the vessel's design or loading state is lacking.
Innovation Solution
A portable sensing device equipped with motion sensors and a computing system that processes real-time data to calculate stability metrics such as roll period and metacentric height, providing a cost-effective and rapid assessment of vessel stability, which can be used to quickly assess the safety of a vessel's loading state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current GM modelling systems are used to assess vessel stability, then stability assessment can be performed, but the systems are expensive, cumbersome and require significant training
Solution Approach 1:
The patent replaces complex mechanical/stability modeling systems with a simplified sensor-based measurement system. Instead of using expensive GM modeling systems that require extensive training and multiple inputs, the invention uses motion sensors to directly measure roll period and calculates stability metrics through automated processing, substituting physical measurement for complex computational modeling
Solution Approach 2:
The patent creates a simplified copy of the stability assessment function. Rather than requiring the full complexity of established GM modeling systems, it replicates the essential stability assessment capability through roll period measurement and automated calculation, providing sufficient accuracy for operational decisions without the overhead of comprehensive modeling systems
2Measurement precision
If comprehensive stability modeling systems are used, then detailed stability analysis can be obtained, but the systems require many inputs that make obtaining accurate assessments quickly virtually impossible
Solution Approach 1:
The patent extracts only the essential measurement needed for stability assessment - the roll period - from the comprehensive set of inputs required by traditional GM modeling systems. By focusing solely on measuring roll motion and calculating stability from that single primary measurement, the system eliminates the need for multiple difficult-to-obtain inputs while maintaining assessment accuracy
Solution Approach 2:
The system performs automated calculation and processing of stability metrics from raw sensor data without requiring manual input of additional parameters. The computing system automatically transforms time domain motion data to frequency domain, identifies roll period, and calculates stability metrics, making the assessment process self-sufficient and eliminating time-consuming data collection steps
3Reliability
If traditional stability assessment methods are used, then stability can be evaluated, but the systems are prohibitive for smaller operations
Solution Approach 1:
The patent employs inexpensive motion sensors and computing components that can be easily deployed and replaced. Instead of investing in expensive, permanent stability modeling systems, smaller operations can use affordable sensor-based systems that provide sufficient stability assessment capability at a fraction of the cost, making the technology accessible to vessels of all sizes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows for immediate and accurate stability calculations, enhancing shipboard safety by providing real-time analysis and early alerts to potential stability issues, making it suitable for various maritime operations without requiring extensive training or prior knowledge of the vessel.
Implementation Method 1
The sensing device may include one or more motion sensors for sensing motion of the vessel
Implementation Method 2
The computing system may be programmed to transform the motion data from time domain motion data to frequency domain motion data
Implementation Method 3
one or more freeboard sensors for determining a freeboard of the vessel
Data Source
AI summary
A portable sensing device may be deployed for determining at least one stability metric of a vessel. The sensing device may include one or more motion sensors for sensing motion of the vessel, one or more freeboard sensors for determining a freeboard of the vessel, and a computing system for processing motion data from the one or more motion sensors and freeboard data from the one or more freeboard sensors to determine the at least one stability metric. The computing system may be programmed to transform the motion data from time domain motion data to frequency domain motion data and process the frequency domain motion data to determine the at least one stability metric of the vessel and the freeboard of the vessel.