Design and Analysis of High Precision OPTO-Mechanical System for Space Application

Star sensor is one of the Opto-Mechanical systems. Star tracker/ Star Sensor is an aerospace navigation instrument used to provide absolute 3-axis attitude information to the spacecraft. A “Lost–in-space� case may develop if there is no accurate attitude determination. Hence there is a requirement attitude determination device of maximized accuracy, reliability, life time and optimized mass, size and cost. A wide variety of attitude sensor exists but this is a new design of Opto-Mechanical system. Star sensors have numerous advantageous over other attitude detectors because of their ability to provide 3 axis orientation information with high accuracy. Star sensors are the most accurate attitude determining devices. Finite Element Method is used to analyze Opto-Mechanical System which is a part of navigation system. This assembly is analyzed for mechanical loading. Star Sensor is analyzed for 4 mechanical load cases. Geometry and loading are specified by LEOS (ISRO). The displacement and Von-Mises stresses are presented. UG NX 7.5 is used for CAD modeling and Analysis. Maximum stresses are observed at the bolt locations (localized stresses) and can be neglected.