Engineering

Engineering Software
The following provides a synopsis of the analytical and engineering capability available through the software currently onboard at Bisso Marine.

GHS (General Hydrostatics)
GHS is one of the most powerful and flexible marine analytical software programs available. Bisso Marine utilizes GHS to create and analyze ship models in both static and dynamic situations. GHS is a "float simulator" that has the flexibility to model and analyze complex hull forms, as well as complex situations common in salvage operations.

Models can be created very rapidly in GHS and can be exported to a variety of other software programs. Bisso Marine maintains a wide variety of models on file, as well as a large library of "run" programs for analyzing a host of commonly encountered salvage situations. GHS is programmable and reflects real life situations such as fire size analyses, heavy lift, parbuckling, etc. Further, GHS is not restricted by integration, memory, or situations common to salvage (deck edge immersion, multiple free surfaces, etc.), as are some other programs.

There are numerous powerful commands and modules unique to GHS, that enables amoungs other functions to reflect a wide multitude :

The modeling of tankage to reflect multiple contents & free surfaces, and transfer schemes,

“Grouping” of tanks to reflect either designed or damaged conditions where flow can be from one tank to another,

The Multi-Body Module is a portion of the GHS system that synchronizes interactions between multiple bodies (ships, docks, tugs/tows, integrated tug and barge, etc.) in concurrent GHS sessions. The bodies interact either by being latched together at one or more points (tow hawser, mooring lines, and the like) or by one “grounding” or resting upon another (docking, submersible operations, etc.)

The “SHELL” command is one of Bisso Marine’s favorites. This allows the GHS program to calculate a value, present it, stop the run, and open another program. We utilize this feature to perform very fine time domain calculations such as oil outflow calculations.

HECSALV
HECSALV is also available to be used as an analytical salvage tool. At times some regulatory activities run HECSALV as a monitoring tool; we can mirror these analyses as needed.

ShipmoPC
ShipmoPC is a strip theory based frequency domain seakeeping program capable of computing six degree-of-freedom motions on mono-hulls with speeds in regular and irregular seas of arbitrary headings. Response Amplitude Operators (RAOs) for heave, pitch, roll and the lateral; sway, roll and yaw motions are derived for the complete range of frequencies using the hull geometry input and specified speeds and headings. The ship dynamics module is capable of accounting for hydrodynamic effects from, rudders, bilge keels, struts, and other appendages and from roll stabilizers (appendages and tanks). For any specified location the hull computed output includes parameters such as accelerations, probability and frequency of deck wetness, keel immergence and slamming – as well as slamming pressures and forces. In addition to calculating slamming, immersion & other loads that can be used in synergetic programs, the RAOs are used within OrcaFlex to support, mooring, heavy lift, and other like analyses.

OrcaFlex
OrcaFlex, including OrcaMoor, is recognized as industries’ most powerful 3D marine dynamics program utilized for the analyses of pipelines, flexible risers, and cables in offshore and inshore marine environments. Within the OrcaMoor module, the program performs the static and dynamic analyses of multiple leg moorings, including all components such as buoys, anchors, wires, chain, as well as the vessel(s) being moored, sea states, and windage and bottom effects. The program is the standard analytical tool for major design firms, operators, and regulatory agencies worldwide.

This highly adaptable software enables towing analyses and “releases” such as a tow disconnect or subsea buoy release. One module of OrcaFlex enables the dynamic modeling of winches. The winch wire, chain, or other line element can be heaved or paid-out at either constant or variable speed, or the winch can be operated in the constant tension mode. The winch model may be a simple or incorporated feature of dead band, inertia, brake drag, and spring case dampening. The control of the winch may be through a length control or force control mode.

AutoDesk Inventor and Mechanical Desktop
In recent years, Bisso Marine has moved into true 3D modeling. We currently utilize AutoDesk Inventor software to create intelligent-adaptive modules of components and assemblies. The adaptively of this software makes designing any item from the simplistic to the most complex extremely efficient. Inventor has embedded applications for sheet metal, surface design, and the ability to import 3D standard parts libraries. Further, as the design progresses, properties of each component are captured allowing for BOMs, technical specifications, and illustrations to be generated with a keystroke. The flexibility of the program is apparent when creating exploded and sectional views of 3D objects, showing clearance, and creating assembly and disassembly instructions in .avi format.

Moreover, Inventor produces adaptive drawings in multiple CAD formats.

ANSYS FEA
The Ansys, our finite element analysis program, is capable of performing linear/non-linear static, linear/non-linear dynamic, buckling, vibration stress, and heat transfer analyses on 2-D and 3-D structural and thermal models. Its inherent sub-structuring technique provides the means to tackle very large and complex systems. Ansys also solves many types of electrical and magnetic field problems. Ansys, like most of our software programs, will import/export the geometric modules that in turn can be designated for global or local analyses.

Ansys runs inside Inventor and Mechanical Desktop software, thus it gives the Bisso Marine engineers the ability to analyze on-the-go capability. In addition, if late on in the design process, a component is changed, the analyses can be performed and the entire system revised to reflect

The advantage of utilizing Ansys in a salvage response is that it can be used in the field to quickly and accurately provide detailed analyses in structural situations common to salvage operations.