EQUIPMENT & CABLING UPDATE
Semi-submersible vehicle for shallow coastal waters
Semi-submersible vehicles have hollow shaft angle sensors to maximise space.
A
SV Ltd is designer and constructor of unmanned marine vehicle systems for commercial and
military applications, providing cost effective solutions for time consuming or dangerous maritime tasks such as hydrographic surveys, surface surveillance, gunnery training and mine-hunting.
When optimising the design of its new ASV 6000 coastal class semi-submersible vehicle, ASV selected Novotechnik GL series hollow shaft potentiometric angle sensors from Variohm EuroSensor to provide rotary position feedback as an intrinsic part of in-house designed actuators used for the steering and ride stabilisation control system Te ASV 6000 was developed for
hydrographic survey and surveillance work in shallow coastal waters and is operated remotely via a continuous GPS communications link. With an overall length of six metres, the semi submersible operates
just below the water surface and carries a payload capacity of 300kg for sonars, computers, sensors, winches and camera equipment. Its diesel propulsion systems allows a range of 400miles at 4knots. Te relatively shallow submersion
requirement for the ASV 6000 meant that actuators specifically for sub-sea use, operational at much greater depths, were massively over-engineered and consequently very expensive. As well as drive the costs down for this
important component, the decision to build the actuators in-house also allowed ASV to manage the design within a considerably space-restricted area on the vessel, freeing up valuable real estate that could be used for payload equipment. Te hollow shaft GL series angle sensor is fitted directly on the actuator motor shaft, significantly reducing the overall assembly length compared to rear shaft mounted variants with couplings.
Fig. 1. The ASV 6000 Unmanned semi-submersible vehicle.
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