Over the work period of Nov 13 - Nov 15:
Following the progress report submission, our team finalized the CAD design for the MMM and sent it to AIAA for approval. The team also presented the final design during the design review presentation for capstone on November 17th. In addition to that, our team completed the parts list for our design and contacted vendors to receive quotes for the materials needed to start the prototyping process.
Final Design concept:
Figure 1 highlights all the components of our team's MMM. The updated final design condenses the previous four rings into three to reduce the weight and number of components in the design. The Bottom Centering Ring and Thrust Plate became the Combined Plate located in Fig. 1. In place of using traditional bolts, the team will be using machined screws that will be screwed through threaded inserts. The use of these inserts is to reduce the risk for crack initiation within the ring, as well as increase the stability of the MMM.
Validation Plan:
Since the MMM will be in motion with the rocket our team has considered the momentum equation as well as the Newton second law of motion for our FBD. The values obtained from the resultant forces of the free body diagram will be converted to pressure then used for the Finite Element Analysis (FEA) boundary conditions. After FEA analysis, we will use the same values to simulate our machined end product using a strain gauge, a load cell, an Arduino with the necessary computer code to verify the deformation and accuracy of our FEA analysis. We will evaluate the success of our design by accomplishing a safety factor >= 2.5. To check the safety factor, we will read the Max Stress that our MMM can withstand from the strain gauge test, combined with material used (Al 7075-T6) Yield Stress (434 Mpa) in the following safety factor (n) equation: n = Yield Stress÷Max Stress.
Team's Plan for winter:
Our team will be utilizing the winter period to order the appropriate materials needed for the project. The team will also work on the progression of the FEA and structural analysis needed for the validation. Furthermore, the team will still meet with AIAA subteam leaders, project managers, and chief engineers to receive feedback and meet upcoming deadlines for both capstone and AIAA.
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