We can provide technical support for early stage feasibility studies of control strategies or undertake troubleshooting problems for in-service or near-service control systems that are proving problematic. (Download capability sheet)
70-Ton Gripper Arm
We are experienced in using dynamic simulations to assess the feasibility of achieving the required control performance, by exploring different sensor types and combinations, and the most effective feedback control scheme. If the assessment had indicated that it needed something too big, too expensive or insufficient performance would result, early decisions could have been made.
Depending on applications, simulations may be built using a range of modelling packages MATLAB/Simulink, LabVIEW and the Control Design and Simulation (CD&Sim) module, etc. Models are kept as simple as possible for the purpose of evaluating dynamic performance.
We are also experienced in implementing control algorithms in full on National Instruments' suite of real-time hardware using its LabVIEW Real-Time, LabVIEW FPGA, LabVIEW MathScript RT and LabVIEW Touch Panel modules.
- SENSE Offshore Wind Turbine Installation ISC undertook the preliminary mathematical modelling of a proposed large motion compensated hydraulic mechanism for the deployment of offshore wind-turbines. This early-stage feasibility study investigated the system requirements necessary to perform vessel to tower transfers and determine under what sea conditions operations could be achieved. A key aspect of this work was making the simulation results representative and identify the key performance drivers. More information about the wider SENSE project can be found on the Sense Offshore website.
- Development of Control System for 70ton Gripper Arms ISC developed the control system for a very large pair of Gripper Arms for the jack-up vessel MPI Discovery, used to install the foundation piles for offshore wind turbines. Early simulations were used to assess the hydraulic and control designs prior to the main software development. Since this was for a working boat minimising commissioning time was critical, ISC developed a software-based emulator to allow the software to be fully tested before the mechanical build was available. It has also helped validate minor software revisions now that the system is in-service. This project was awarded the Application of the Year prize by National Instruments at their Graphical System Design Achievement Awards.(Download project presentation)
- Design, Development and Deployment of Control System for Motion Compensated, Hydraulic, Offshore Wind Turbine Access System (TAS) Initially contracted to assess the performance attainable for a hydraulically actuated gangway, when compensating against boat motions. This involved modelling the various sources of errors – from sensing, actuation and control performance – to achieve the target performance whilst minimising cost and complexity. ISC were then engaged to implement the entire control system, which included MMI using touch panel computers, real-time control and I/O, solving kinematics, and extensive monitoring and safety logic. Full factory testing and Sea Trials have been completed.(Download project presentation)
- Analysis of Hydraulic Damping for a Launch and Recovery A-frame Modelling exercise to analyse the hydraulic damping within a launch and recovery A-frame, to allow proposed system changes to be reviewed to ensure they would deliver the intended improvements on the vessel.
- Optimised Gain Scheduled Integrated Fin-Rudder Roll Stabilisation Gain scheduled roll stabilisation controllers were optimised using models of vessel and wave dynamics. Our solution was tested on a nonlinear model of the vessel, and out-performed more advanced methods developed by academic groups.
- Active Heave Compensation Design and Implementation for Ocean Survey Vessel A model of ship motions and heave compensation control were developed. The new algorithms were implemented on the ships PLC and tested during sea trials.(Download project presentation)