Technical Rules Software
SeaTrust-ISTAS
provides users with fast, effective and generalized analysis measures that can cover not only
normalships but also new typed ships.
Each of the modules that take some special roles in ISTAS are as follows.
- Ship motions and wave loads analysis
- Stochastic analysis and design loads generation
- Loads generation for FEAnalysis
- Solver for FEAnalysis
- Simulation of ship motions, waves, stress and displacement
- Buckling and ultimate strength assessment
Release Note
| Version | Release Date | Description |
|---|---|---|
| 1.0 | 1 February 2001 | First release |
| 2.0 | 1 February 2002 | Added container load function |
| 3.0 | 1 July 2006 | Enhanced liquid cargo normal search |
| 4.0 | 1 November 2008 | Added intermittent wave function |
| 5.0 | 1 November 2010 | Improved still weight generation |
| 6.0 | 27 November 2012 | Additional gyration setting function of liquid cargo |
| 7.0 | 1 February 2016 | Improved GUI function using Window Interface |
| 7.1 | 27 December 2016 | Various error correction |
| 8.0 | 4 August 2020 | Integrate solvers |
Hardware Requirement
| Item | Spec. |
|---|---|
| OS | Windows 7, 10 (32 or 64Bit) |
| CPU | 2GHz or faster |
| Memory | 2GB or more (Recommended : 4G or more) |
| HDD Free Space | 300MB or more (Recommended : 500G or more) |
| Display | 1920 x 1080 (FHD) or higher resolution |
Benefits
The benefits that ISTAS provides for designers and operators are
- Easy comprehension of ship motion and structural behavior in all sea states through powerful real time post processing
- Provision of information on the structurally weak parts in real wave climate for decisions on ship heading angle and speed
- Presentation of buckling and ultimate hull girder capacity to improve ship structure
- Establishment of boundary and loading condition for direct hold analysis and fatigue analysis
- Inclusion of finite element solver
- Operation of all modules in Windows configuration
- Fatigue Analysis
Sea-keeping and Hydrodynamic Analysis
All characteristics of ship (hull form, speed, weight distribution and real wave climate, etc.) are considered to obtain dynamic load based on 3D Panel theory.
The stochastic analysis is carried out to obtain the most probable extreme value having a return period corresponding to ship's life.
- ship motions in six degrees of freedom
- relative motions and acceleration at specified points
- sectional forces and moments,
- total pressure distribution on wetted surface
Load generation and structural analysis
All design loads obtained from hydrodynamic analysis are transferred automatically to global ship finite element model. The finite element analysis is performed using IPSAP which is embedded in the ISTAS-Holdan, and NASTRAN.
Real-time simulation
Using this module, designers and operators are able to easily make
combination of load cases and animate dynamic response
Buckling Strength and Ultimate Strength Evaluation
SeaTrust-HullScan provides buckling strength evaluation and ultimate strength evaluation based on KR rules.
Fatigue Analysis
Using SeaTrust-FANSYS, spectral fatigue analysis is performed to evaluate fatigue life directly with stress results from whole ship analysis at all heading angles and wave frequencies
