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http://10.1.7.192:80/jspui/handle/123456789/11952
Title: | Design and Development of High Precision Linear Motion Mechanisms for Space Applications |
Authors: | Sheth, Mahammedanas |
Keywords: | Mechanical 2021 Project Report 2021 Mechanical Project Report Project Report 21MMC 21MMCC 21MMCC11 CAD/CAM CAD/CAM 2021 |
Issue Date: | 1-Jun-2023 |
Publisher: | Institute of Technology |
Abstract: | Linear motion mechanisms are the mechanisms that have motion in a straight line. Various mechanisms produce linear motion like linear slides, linear actuator, and linear compressor. Actuators in space are used in payload for functioning of satellite and payload devices. Linear Actuator are used in payload, which is used to get the required motion linearly at microns’ level. During the launch of satellite or payload, heavy vibration occurs and due to vibration, there is unwanted motion in components. So to protect from vibration and to prevent unnecessary motion in linear actuator, launch lock mechanism is used. The launch locks are typically one-time use systems and are based on pyrotechnic, electromechanical, or NiTi driven pin pullers. Launch locks made of shape memory alloy are relatively simple to use, lightweight, and less bulky than other concepts. So hold and release mechanism is designed for piezo based linear actuator using nitinol wires and its 3D model and its analysis is done in Parametric CREO. Also to obtain the required motion of piezo based linear actuator and according to the requirements of payload, different analysis like static, modal, frequency and random response analysis is performed in Parametric CREO and according to the analysis, the design is modified. The next linear motion mechanism designed is linear compressor for cryocooler. Compressor is a device used to compress air at low pressure and produce it at high pressure. The rotary type compressor is designed and analyzed for a cryocooler for transferring of inert gas from one position to another position using slider crank mechanism principle as slider crank mechanism has few moving parts and is compact in design. Brushless DC motor is used as a power source to drive the eccentric shaft and using slider crank principle, helium gas is conveyed from compressor to cooler through compressor piston as piston reciprocates back and forth. Different apparatus like hermetic feed through, O-ring, pressure sensor, flexure bearing and housings are used for proper functioning of compressor. Also dynamic and sensitivity analysis is performed and also piston displacement validation is done by doing simulation in PTC Creo. |
URI: | http://10.1.7.192:80/jspui/handle/123456789/11952 |
Appears in Collections: | Dissertation, ME (CAD/CAM) |
Files in This Item:
File | Description | Size | Format | |
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21MMCC11.pdf | 21MMCC11 | 2.74 MB | Adobe PDF | ![]() View/Open |
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