Design and development of inter-satellite separation mechanism for Twin Nano satellite — STUDSAT-2
This paper describes the detailed design, development and dynamic analysis of Separation Mechanism for Twin Nano-satellite “STUDSAT-2”. The separation mechanism system is interfaced between the two nano-satellites, STUDSAT-2A and STUDSAT-2B. After the ejection from the PSLV (Polar Satellite Launch Vehicle), due to stability constraints, the satellite is required to remain composite for an estimated period of 3 orbits before separation. Developing a reliable separation mechanism to sustain the launch vehicle vibrations and the space environment is of highest importance. Different design approaches and actuation strategies have been examined to ensure a uniform separation with least disturbance due to mechanically constrained surfaces. The analytical calculation to achieve the required relative velocity of the two satellite with respect to center of mass of the composite structure is performed and same has been validated using ANSYS rigid dynamics tool. Furthermore, the tool is also used to validate structural rigidity.
Printed UHF antenna for satellite communication
In our contemporary world satellite technology is one of the biggest invention for human being. There are thousands of satellite orbiting in the space now-a-days. Most of them are commercial satellite which have a large operational goal. But in recent years a new type of satellite is getting popular which is known as nano satellite or cube satellite. The reason behind this type of satellite is getting admired because it is cost efficient, light weight and focused in limited mission goal. Large satellite has different types of mission goal in one single satellite. But now multiple mission goals are being cut down in small goals and for achieving those small goals nano satellites are the perfect choice. For the nano satellite operation communication through the antenna is one of the major issue for successful mission. In this following research paper we have proposed a microstrip patch antenna with UHF band for nano satellite operations. For miniaturization of antenna in mm unit coaxial probe has been used. Experiment with different types of patch width, ground, feed point gives our design perfection. By comparing our design with pervious related works we get to know about the uniqueness of our design.
Multiple failure mode and effects analysis-an approach to risk assessment of multiple failures with FMEA
By integrating the procedures of the FMEA method (failure mode and effects analysis) and the FTA method (fault tree analysis) into a combined procedure, the mFMEA (multiple failure mode and effects analysis), an inclusive reliability analysis of complex, mechatronical systems, is made possible. The advantages of both methods are brought together and integrated into a new procedure. The FMEA along with its risk analysis, risk assessment and measure controlling, paralleling systematically to the product design cycle is only applicable for single failures. The FTA expands the new procedure through a failure analysis with the help of its combination option to network failures according to Boolean logic. The new procedure allows for the consideration of multiple failures while retaining all the characteristics of FMEA. In addition, through the use of failure networks quantitative information can be derived concerning the system's availability, which delivers important information along with the results of the mFMEA.