The utilization of CubeSats as a cost-effective solution for satellite missions allows universities to engage in outer space research. Notably, the issue of increased tumbling rates during deployment is highlighted, attributed mainly to propulsion and guiding functions performed by existing contact actuators.
The proposed solution in this thesis employs viscous traction actuators, which manipulate a thin air film to generate both propulsion and guiding forces. The preliminary design of propulsion and guiding functions incorporates these actuators on the inner sides of the deployer case. The design requirements are established as a criterion to evaluate the redesigned propulsion and guiding functions, including minimal exit velocity, maximal tumbling rate, and maximum acceleration. Moreover, the inner envelope accommodates a 3U CubeSat, and estimation for air reservoir volume and pressure ensure adequate space for launch deployment.
Performance simulation is proposed to evaluate whether the design satisfies the design requirements. It consists of the simulation of the viscous traction actuator and the full model simulation of the deployer. For the simulation of the viscous traction actuator, the finite element method is used to calculate load capacity and viscous traction applied by the viscous traction actuator as input to the full model simulation of the deployer. The full model simulation of the deployer assesses CubeSat motion and propulsion force. The successful fulfillment of design requirements and safe deployment are confirmed.
While the preliminary design meets design requirements, a design method is introduced to cater to varied exit velocity and tumbling rate preferences. This approach adjust design parameters based on a propulsion force vs. time plot. Two distinct designs are presented based on this approach, catering to differing preferences.
The selected +EPC design, characterized by low tumbling rates, progresses to a detailed mechanical design encompassing deployer case, actuator, displacement sensor, and air-supplied system. The implementation of the viscous traction actuator follows established research, ensuring structural safety. Other aspects like displacement measurement, air reservoir selection are also discussed in this detailed design.