DESIGN AND DEVELOPMENT OF STABILISED PLATFORM FOR INDIAN NAVAL SHIPS USING MEMS SENSORS

Abstract

ABSTRACT The use of roll and pitch stabilised platforms onboard ships, aircrafts and submarines is a common practice so as to ensure common plane of operation for all systems in a three dimensional space. It is to ensure that their performance is not affected by movement of vessel due to various undesirable forces acting on it. While weapon systems require a higher degree of accuracy and precision in stabilisers, there are other systems where accuracy and precision of stabilisation can be compromised to a certain extent. Some such systems are communication antennas, TV satellite dish, solar panel etc. installed on ships and aircrafts. These systems, if stabilised over a platform using some economic system, then accuracy can be compromised to certain extent. Present thesis deals with design and development of similar low cost MEMS sensor based roll, pitch stabilised platform. It uses ADXL345 accelerometer sensor which senses raw acceleration values in all three axes in terms of acceleration due to gravity (g) and transmits to a controller which converts the acceleration into roll and pitch values. The roll and pitch is further transformed into negative feedback and given to servo motors connected to a platform that is free to rotate in x and y axes. Thus, movement of X and Y planes of platform in the direction opposite to roll and pitch experienced by the ship helps in realising a stabilised platform which can be employed