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SimulationX® interface to OrcaFlex for advanced numerical analysis of complete system dynamics

SimulationX® interface to OrcaFlex for advanced numerical analysis of complete system dynamics

Modeling and simulation tools have developed into various software applications for different domains. Some tools specialize in finite element analysis, some in computational fluid dynamics, some in hydro-dynamics, others in hydraulic system response analysis, and so forth. Currently, there is no software provider which includes all physical domains in one single CAE tool. The CAE tool potentially compromises the simulation performance due to the difference in numerical stiffness required for each physical domain, where pure rigid multibody dynamics can be solved quite fast, but the nature of fluid power systems introduces much higher stiffness.
In particular, offshore systems, like a riser tensioner or an offshore crane for subsea installation, pose many challenges for the CAE engineers due to the many different physical domains; hydro-dynamics, structural dynamics, multibody dynamics, fluid power, electrical actuation and more.
In order to overcome these challenges, Agito have developed a set of sample files on how the widely used ‘OrcaFlex for hydrodynamics and mooring systems can be co-simulated with the multi-domain software package SimulationX®, which is widely used for dynamic analysis of the surface and subsea equipment.
Utilizing co-simulation, the engineers obtain a fully analytical simulation where all coupled effects are handled. This gives more accurate and realistic simulation results, as well as saving the engineer’s time determining how to obtain the relative input for each of the domains. In the offshore industry, many companies have engineers working with hydrodynamic analysis on one side of the table struggling to estimate the applied forces from cranes, riser tensioner systems, etc. and on the other side of the table engineers using detailed models to establish motion input for vessels in order to evaluate the performance of their hydro-mechanical systems. Co-simulation will save engineering hours and increase the accuracy of the analysis.
Please contact Agito at and request our sample models for co-simulation between OrcaFlex and SimulationX®.

Using SimulationX® to realize the Challenges of Subsea Accumulators in Deep Water

Hardware-in-the-Loop Simulation: Enhanced Test Method for IWOCS

“We have always done it that way”.
This can be seven expensive words if used in an industry that continuously search for safety improvement and cost reduction.

Data Respons and Agito have performed a study where the scope is to explain how Hardware-In-the-Loop can be applied in the development of, and test of subsea control system software. The study points on what improvements can be expected on both safety and development cost and is partly funded by Innovation Norway and NCE Systems Engineering Kongsberg.

The oil and gas industry has always improved their technology and pushed the limits for what’s possible in harsh environments. New technology has continuously been applied, limits has been challenged and needs for new and enhanced test methods have been a result of this. Installation and Work-Over Control System (IWOCS) is a system which has local control of the well whilst operating on a live well. Risk for accidents with impact on equipment, personnel and environment is high. At the same time it is a constant demand from the operators that the well maintenance shall be performed as fast as possible and failures, which can result in extra hours of lost production, is not an option.

By introducing Hardware-in-the-Loop (HiL) as a test method on IWOCS, the risk for control system failures are reduced. System upgrades and reconfigurations to different subsea systems and environments, can be thoroughly tested onshore before sent offshore for installation. The required time for testing offshore can be reduced without reducing the level of safety in the process.

System level testing is one of the major expenses in developing Embedded Control Systems for offshore installations. The need to minimize time to market while simultaneously producing thoroughly tested products present tremendous challenges. Increasing levels of complexity in system hardware and software are making this problem more severe with each new generation of products. Additionally, any significant changes to an existing product’s hardware or software must be thoroughly regression-tested to confirm that the changes do not produce unintended effects.

Using HiL simulation technology for testing control systems makes it possible to perform extensive testing at early stages of the development process. Safety routines can be developed, optimized and verified against systems with same response as the real systems without damaging equipment or creating hazard situations for test personnel.

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