BEML showcased new UAVs | Under water glide vehicle tested 1st time in india

Except the Remotely Operated Vehicles (ROVs) and other hybrid vehicles that have an umbilical
cable connecting the vehicle and mother-ship, all other UVs either carry the source of power on-board
or are designed with self-propulsion mode. This scenario demands that the power on-board is
utilized efficiently so that the endurance in terms of either range or operational abilities is optimized.
Major areas of power consumption in the UVs are: propulsion, sensing, hotel loads and depth control
through buoyancy changes . Operations like depth control, trim adjustment, deep diving and
adjustments for the changes in sea water density and maneuvering requirements demand a change in
the vehicle’s designed buoyancy.
From the basic principles of physics it is known that a very accurately buoyancy change can be
achieved with the application of thrust application. In theory, the thruster can be located in the radial
direction and that allows the delivery of thrust in any direction (360 degrees), but in practice it has
serious limitations because only a few directions will have a buoyancy component in the delivered
thrust and other components in certain direction will even contribute to increase in the drag. This is
shown in Figure 1. Furthermore, the application of thrust is power intensive and for a system design
for which power comes at a premium because of expensive and space constrained battery resources,
power cannot be drained for buoyancy adjustment without seriously affecting the range and endurance
adversely. Hence, alternate mechanisms for buoyancy control need to be explored
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