Control system provides the required correction during mid-flight of a
missile. DRDO has developed analogue and digital autopilots and a number of
actuation systems for various missiles. Different types of actuation systems
developed are electrohydraulic actuation system for aerodynamic, thrust
vector and fin tip controls; lightweight, medium power blow-down
electropneumatic actuation system, and electromechanical actuation system.
Electropneumatic Actuation System
A lightweight, medium power,
blow-down, self-cleaning electropneumatic actuation system has been
developed for short range SAM for driving aerodynamic control surface. The
system comprises actuators, air bottles, pyro valves, pressure regulator,
and control electronics.
Electromechanical Linear Actuator
A high power, lightweight linear
electromechanical linear actuator comprises a brush-less DC motor and a
satellite roller mechanical screw with linear variable differential
transformer as a positional sensor.
The actuator can withstand
very high shock and vibration levels and generates a force of two ton with a
bandwidth of 10 Hz. Product can be used in all types of aerospace vehicles.
DRDO has developed three types of electromechanical linear actuators for use
in different missile systems.
Electromechanical Actuation System
A lightweight, low power
electro-mechanical actuation system with brush DC motors has been developed
for antitank missiles for driving aerodynamic control surface.
It is a maintenance-free
system with minimum number of components used for fin and jet vane control
besides actuator power supply, and control electronics.
Electrohydraulic Servo Valve
DRDO has developed a high gain, fast response,
spool-type flow control electrohydraulic servo valve. Maximum operating
pressure of the valve varies from 210 bar to 280 bar and rated flow varies
from 10 lpm to 15 lpm with a bandwidth more than 200 Hz. The valve confirms
to international standard ARP 490 E.
Flapper nozzle first stage
Stabilised materials, double
coil, double air gaps and double nozzle
Amplifier to reduce
temperature effects on performance
Frictionless flexure tube
support for AFSA
High frequency response
On-Off Cold & Hot Gas
On-off cold and hot gas control valve is
used for cold and hot gas reaction control systems. DRDO has developed
different varieties of lightweight, compact, fast reacting and leakproof
on-off valves based on flow, pressure, and operating voltage.
Electromechanical Fin & Jet Vane Actuation System
Electromechanical fin and jet vane
actuation system is used for dual actuation of fins (aero dynamic control)
and jet vanes (thrust vector control). DRDO has developed a high speed
bandwidth electromechanical actuator. The system accomplishes jettisoning of
jet vanes using Murman band and electro-explosive pin puller. It controls
dual actuation of fins and jet vanes simultaneously.