The HBM eDAQ monitors hull for maximum military success

The latest British military fast landing craft demonstrator has been developed and built by QinetiQ using the HBM eDAQ data acquisition system as part of the testing and analysis regime. The Partial Air Cushion Supported CATamaran (PACSCAT) Innovative Solution Demonstrator Craft (ISDC) vessel is intended for use in a variety of military roles and may be suitable for commercial applications.

The PACSCAT ISDC is based on a hovercraft design with twin hulls. Air is blown in between the two catamaran hulls to give lift that reduces drag, increases speed, and allows greater beaching capabilities. HBM’s equipment was used as part of an onboard instrumentation system to monitor operational performance in real-time.

Large number of design constraints

To meet military specifications the craft faced a large number of design constraints. High speed and high payload capacity were needed to ensure maximum military capability in conjunction with low draught and wa h characteristics to avoid detection by any enemy. In addition, the craft had to be capable of docking in the well dock of supporting Royal Navy ships, such as HMS Albion.

Browell used HBM’s Glyphworks for the initial analysis. He says, “The interface is a visual piece of software and that makes it very easy and instinctive to work with.” Once the initial analysis was complete, Browell was able to easily export the results into Excel which could then be distributed for additional comments.

The PACSCAT Catamaran

The aluminum PACSCAT, which is classified by Lloyd's Register, has an overall length of 29.7 m and a beam of 7.7 m. Its operational draft is 1.2 m with a range of 250 nautical miles at 25 knots. The craft is designed to carry a variety of military loads for differing operational requirements. These can vary from five Viking allterrain vehicles, or 2 to 4 4x4 MAN trucks, to a single Hippo beach armored recovery vehicle, or a single Challenger 2 main battle tank.

The craft is propelled by two MJP 750 water jets each driven by an MTU 400016vM90 engine. Two Yanmar 6LYA engines provide power to the two Witt duplex fans that lift the vessel when in action. The hull was tested for effectiveness against the UK MoD Fast Landing Craft operational requirements.

Real-time monitoring with the HBM SoMat eDAQ data acquisition units

Instrumentation has been fitted throughout the craft to determine performance and help optimize future vessel design. HBM’s eDAQ data acquisition unit is stowed in the starboard store below the wheelhouse and accessed in the crew room on the port side where the user can monitor realtime information during
trials via the GUI.

The eDAQ onboard instrumentation system records 49 strain gauges, two hull pressure transducers,three triaxial accelerometers and two shaft torque transducers. Browell adds, “The equipment has been very good.” One particular aspect was the support provided by HBM. “They were very easy to work with and the products have been really good for the application,” notes Browell.

Fig. 3 : Fatigue analysis of an engine cradle with nCode DesignLife and the Dang Van criterion, results on plain metal sheet

Fig. 4 : Fatigue analysis of an engine cradle with nCode DesignLife and the Dang Van criterion, results on electric spot welds (ESW)

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