Simulation-Based Design
Block Lifting Simulation Based on MBD
We are studying advanced simulation methods to evaluate the safety of block-lifting operations using large cranes—such as offshore floating and gantry cranes—in shipyards. To this end, we are utilizing SyMAP (SyDLab’s Multiphysics Analysis Program), a multi-body dynamics program specifically designed for shipbuilding and developed in-house by our laboratory.
– Calculation of block position, deformation, and stress, as well as the tensile force acting on wire ropes, based on rigid-body/flexible-body multibody dynamics
– Detection of collisions between blocks and between blocks and wire ropes, and calculation of collision forces
– Consideration of various hydrodynamic forces and mooring forces depending on sea conditions
Crane Control Based on DRL
We are studying methods for the automatic control of large cranes (such as offshore floating cranes and gantry cranes) used in shipyards using reinforcement learning. To minimize block movement during block lifting, we automatically control the winding speed of the crane’s wire ropes.
– Modeling of block loading and turnover operations based on reinforcement learning
– Calculation of block motion and tension acting on wire ropes using multi-body dynamics
– Support for complex lifting operations, such as turnover
– Consideration of various hydrodynamic and mooring forces depending on sea conditions
Block Lifting Simulation Considering Deformation
We are studying simulation methods based on flexible multibody dynamics to model deformations that may occur during the lifting and turning over of sheet blocks.
– Calculation of the position, deformation, and stress of blocks, as well as the tensile force acting on wire ropes, based on flexible multibody dynamics
– Consideration of various hydrodynamic forces and mooring forces depending on sea conditions
Block Lifting Simulation Considering Collision
We are studying simulation methods that account for various types of interference or collisions that may occur between blocks or between blocks and wire ropes during block lifting. In the event of a collision, the method calculates the collision location and force and outputs this data as input for structural analysis.
– Calculation of whether a collision occurs between blocks or between blocks and wire ropes, as well as the collision location and force
– Consideration of various hydrodynamic forces and mooring forces depending on sea conditions
– Function to output collision location and force
Cargo Offloading Simulation
We are studying simulation methods for cargo transfer operations between an LNG FPSO (FLNG) and an LNG carrier using multibody dynamics. We model the LNG FPSO and the LNG carrier—which are connected via a loading frame—as a multibody system, and then predict their motion and the tension acting on the mooring lines under various sea conditions.
– Calculation of the motion of the LNG FPSO and LNG carrier, as well as the tension acting on the mooring lines, based on multibody dynamics
– Calculation of the likelihood of a collision between the LNG FPSO and LNG carrier, as well as the collision forces
– Consideration of various hydrodynamic forces and mooring forces depending on sea conditions
Ship Flooding Simulation
We are studying methods for simulating the flooding of ships damaged by collisions, groundings, and other incidents. We predict the ship’s attitude, equilibrium state, and stability by considering the flow entering and exiting through damaged areas and openings.
– Calculation of inflow and outflow rates through damaged areas and openings
– Consideration of pressure calculations for watertight and ventilated compartments
– Volume calculation for complex compartments using the multi-body integration method
– Calculation of oil spill rates
– Calculation of the ship’s attitude and state of equilibrium over time
– Assessment of damage stability
Shipwreck Salvage Simulation
We are studying simulation methods for salvaging a sunken shipwreck from the seabed. For various salvage methods (such as offshore cranes and jack-up barges), we predict the shipwreck’s movement during salvage and the tensile forces acting on the wire ropes as a function of sea conditions.
– Calculation of the motion of the sunken shipwreck and the tension acting on wire ropes based on multi-body dynamics
– Calculation of collision probability and forces between offshore cranes/jack-up barges and the sunken shipwreck
– Support for salvage methods involving the hoisting of the sunken shipwreck using chains
– Consideration of various hydrodynamic forces depending on sea conditions
Ship Evacuation Simulation
We are studying passenger evacuation simulation methods for EER (Evacuation, Escape, and Rescue) analysis of a passenger ship. In particular, we are striving to obtain realistic results by simulating passenger movements while accounting for the ship’s dynamic state, including during flooding.
– DEVS-based simulation
– Research on human behavior models that consider the surrounding environment
– Consideration of the ship’s dynamic state, such as flooding
Integrated Simulation
We are studying simulation methods that integrate analysis, visualization, and hardware to ensure the consistency and completeness of design results. We execute various engineering analyses in real time, visualize the results in a more immersive way, and simultaneously integrate hardware as input and output for the simulations.
– Integrated simulation interface
– Real-time parallel processing or surrogate modeling for high-speed analysis
– VR/AR-based immersive visualization
– Integration with various HMI (Human-Machine Interface) devices