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Software

AMOG develops an array of software solutions for the engineering industry.

The Smart Mooring Integrity Checker (SMIC) system detects mooring line failures even in benign conditions, giving indication of a mooring line failure before a potentially damaging storm condition comes through the field. SMIC achieves this using proprietary machine learning algorithms to understand and describe the underlying mooring system behaviour without the need for complex numerical models of the hull and mooring system. Once this understanding is achieved by SMIC, it can predict the system performance in the prevailing environment and compare this to the measured performance. A difference in predicted performance to the measured performance is an indicator of mooring line failure.

What is SMIC?

SMIC is a hardware, software and support service offering, easily customisable for each floating production unit. SMICs major components are:

  • Rack-mount or desktop computer with network connectivity
  • An interface setup for all input data streams (either in software or hardware)
  • The SMIC software package
  • A monitoring interface, either intranet web based or integrated with existing systems aboard the floating production unit
  • Model training, SMIC system maintenance and around the clock anomaly response by experienced AMOG engineers
  • Regular performance reports on the response of the mooring system

How does it Work?

One of the key characteristics of SMIC is its ability to use already installed monitoring equipment on a floating production unit. For this reason the system is cost-effective and easily retrofittable without interruption to normal operations, especially when compared to other monitoring technologies such as load cells or fairlead angle measurement devices.

SMIC uses key environment and vessel data streams to train several bespoke machine learning algorithms on the performance of the mooring system; typically vessel offsets and frequency domain response. This training generates a model of the system. The system then uses this model to predict the response of a floating production unit to the environmental conditions being seen in field. The prediction of system performance is compared to the measured system performance over a sample time period. If the prediction diverges from the measured performance a hierarchy of response is triggered, allowing investigation of the anomalous response.

SMIC incorporates a resilient combination of bespoke machine learning algorithms, capable of coping with irregular, low quality or missing data feeds for extended periods of time. This resilience improves over the life of the system, with more data improving the model of the underlying system. AMOG's bespoke machine learning algorithms have been developed and trained on actual floating production units using data-streams from systems already aboard. This system training included identification of a real life line failure event.

SITREP is a Hazard Log tool, providing the ability to enter and track hazard specific information; it has been specifically designed and developed by AMOG Consulting to provide a simple, platform-independent, user friendly program for recording and tracking hazards information, a key element of any Safety Program.

The SITREP tool is closely aligned with Safety Case methodologies and provides flexibility is defining project specific risk acceptance criteria. Report outputs are provided via a Report Server repository which provides consistent and controlled data presentation. SITREP is hosted on an Apache2 software platform, integrated using PHP5 scripting language to provide interactive web applications and utilises the open source MySQL5.1 relational database engine supporting transactions, views, procedures and functions.

  • SITREP

SITREP's web-based design offers many advantages including:

  • The ability to have multiple users logged in simultaneously.
  • Multiple Platform Support via its web browser interface.
  • Compatibility with current Microsoft operating systems and web browsers (Firefox and IE).
  • Multiple access sites, including remote VPN access.
  • Ease of installation (no local application).
  • Apache2. The most popular web hosting software platform - almost twice the active installs as its nearest rival (Microsoft IIS).

SITREP has the ability to generate many reports including:

  • Preliminary Hazard Analysis (PHA).
  • Risk Acceptance Criteria.
  • Mishap Lists.
  • Key controls (and assignments).
  • System Hazard Analysis (SHA).
  • Verification matrix.
  • Derived requirements list.
  • Control impact report.
  • Control verification report.

SIAFEM is a finite element analysis post-processing software developed to calculate strength and fatigue utilisations of fabricated steel structures to structural design codes.

It accesses and post-processes STRAND7 finite element analysis stress results and allows utilisations for both strength and fatigue calculations to be visualised in STRAND7. It employs a graphical user interface (GUI) that runs in a Windows environment.

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Figure - SIAFEMStressOutput Figure - Suction Anchor SIAFEM Utilisations

The software has been developed to meet the requirements of AMOG Consulting for conducting structural audits and developing designs of fabricated structures in respect to strength and fatigue in both the marine and mining sectors.

The software is under continual development with additional functionality being implemented subject to both user and AMOG requirements.

The general capabilities of SIAFEM are summarised as follows:

  • Employs both GUI and direct input file interface for set-up and execution of analyses.
  • Assess both parent metal and weld structural integrity.
  • Supports assessment of STRAND7 shell element finite element models.
  • Conduct fatigue performance checks to AS4100, AWS, ABS and DNV codes.
  • Produces output which can be viewed as colour contours on STRAND7 finite element models.
  • Produce text output of stresses, stress cycle data, fatigue damage and utilisations.
  • Software support by e-mail.

With over twenty years of industry use and continuous development, SHEAR7 is one of the leading modeling tools for the prediction of vortex-induced vibration (VIV). The program’s forte is the VIV response prediction of offshore structures subjected to spatially varying currents; realistic of ocean environments. The program enables users to estimate structural responses, mean drag force amplification factors and predict fatigue damage. It is simple and fast to run with all the results summarized in a convenient standard output file. The new release allows for more accurate modeling of Strakes.

For more information about SHEAR7 including demo software and licence enquiries, please visit the SHEAR7 website.

The nuts and bolts...

SHEAR7 is a mode superposition program, which evaluates which modes are likely to be excited by vortex shedding and estimates the steady state,cross-flow, VIV response in uniform or sheared flows. It is capable of evaluating multi-mode, non-lock-in response, as well as single mode lock-in response.

The program evaluates natural frequencies and mode shapes of cables and beams with linearly varying or slowly varying tension and with a variety of boundary conditions, including cantilevers and free hanging risers. The program is capable of evaluating the natural frequencies and mode shapes and VIV response of horizontal catenary cables and uses an approximate structural model for inclined catenary cables.

The user may choose to compute natural frequencies and mode shapes in a separate program, such as a finite element program and provide them as input to SHEAR7 in a common.mds file. In this way, structures which are not in the standard solution set of SHEAR7 may be evaluated.

SHEAR7 can be used to predict the cross flow RMS displacement and stress; as well as fatigue damage rate and local drag amplification coefficients.

Cylinders are not required to be of constant cross-section. The user may also model sections of risers with VIV suppression devices (strakes and fairings) as well as staggered buoyancy modules.

The basic solution technique used is modal analysis and iteration (to account for the non-linear relationship between response and lift coefficient.) The physical assumption is that the power input (by lift force) and power output (through damping) for each mode should be in balance in a steady state. From initial values of lift and damping coefficients, the program finds the lift and damping coefficients in a balanced state through iteration. The converged lift and damping coefficients are used to compute cylinder response.

Throughout the years of development, SHEAR7 has remained a very simple to use program, that can quickly be run from a standard desktop computer. Once the program has run, an out file is produced which conveniently summarizes the results.

  • Incorporate your own lift coefficient and damping data from experiments to predict behavour of long flexible structures.
  • The ability to define the lift and damping behaviour separately for each zone on the structure.
  • Results can be produced in the time domain for rainflow fatigue calculations or incorporation with other modeling programs.

SHEAR7 VIV Training

The next SHEAR7 Training Course is designed for those new to the SHEAR7, those who would like a refresher and also experts who are looking to further expand their understanding of the software.

Usually held annually in March, if you would like to enquire about SHEAR7 courses or if you would like more information on SHEAR7, please contact us via the SHEAR7 website.