Polar Ship Navigation Simulation With Broken-Ice Propeller Modeling
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Solution Overview
Problem
Existing polar-region ship navigation simulation systems fail to accurately consider the influence of broken ice on propeller thrust and face challenges in real-time ice load calculations, lacking sufficient hydrodynamic force consideration and material parameter variability of polar-region ice.
Innovation Solution
A polar-region ship navigation simulation system comprising a comprehensive management and evaluation subsystem, ship sailing control simulation, polar-region working environment simulation, real-time motion simulation, and vision simulation subsystems, which include modules for propeller thrust calculation, ice collision models, and real-time ice load determination using multi-thread parallel programming and six-degree-of-freedom motion simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete element or finite element method is used to calculate ice load, then calculation accuracy is improved, but real-time performance deteriorates
Solution Approach 1:
The ice load calculation is segmented into multiple components: ice field generation, ice-ship contact detection, and ice load computation. Each segment is handled by dedicated modules that can operate independently and in parallel, improving both accuracy and real-time performance
Solution Approach 2:
An intermediary ice field module is introduced between the environment simulation and the ship motion simulation. This module pre-generates ice fields and manages ice-ship interactions, acting as a mediator that enables accurate ice load calculation without bottlenecking the real-time simulation loop
2Productivity
If empirical formula method is used to calculate ice load, then calculation speed is improved, but ability to generate actual broken ice deteriorates
Solution Approach 1:
The system uses discrete element method to generate virtual broken ice pieces that copy the physical characteristics and distribution patterns of real broken ice. These virtual ice pieces are then used in the simulation to maintain realism while enabling faster calculation compared to full finite element analysis
Solution Approach 2:
The ice field module dynamically adjusts ice parameters (size, shape, distribution, strength) based on environmental conditions and ship motion. This allows the system to generate realistic broken ice configurations without requiring computationally intensive methods for each scenario
3Device complexity
If single material parameters of ice are used, then device complexity is reduced, but adaptability to different polar-region ice conditions deteriorates
Solution Approach 1:
The ice material parameters are made dynamic rather than static. The system adjusts ice properties (density, strength, thickness) in real-time based on the simulated polar-region environment conditions, allowing the same ice field module to adapt to different ice types and conditions without requiring multiple separate models
Solution Approach 2:
The system implements parameter changes by allowing ice material properties to vary based on environmental inputs. The ice field generation module receives environmental conditions and automatically adjusts ice parameters to match the specific polar-region conditions being simulated
Data Source
AI summary
It provides the following solutions: the system includes subsystems such as an integrated management and evaluation subsystem, and constructs a ship six-degree-of-freedom motion model. A thrust calculation model is built for the problem of propeller thrust affected by broken ice during the propulsion process. By treating broken ice as independent moving objects, the motion of broken ice is solved to obtain the relative motion speed between the ship and broken ice. The influence of broken ice on propeller performance is considered by incorporating the relative speed between the ship and broken ice into the propeller modeling process, which acts on the aforementioned model. The annular crack method is used to determine the breaking shape of level ice, and the generated broken ice is close to real-world conditions.