Introduction
In this scenario, framework had to be constructed for a mount structure for a Lycoming O-300. The constraints for the framework included the use of 1 1/2 inch ANSI pipes, it must support 250lb distributed at 3 points, there must be 7 fixed constraints, the members must be mitered, and the design has to be tested in negative 3 G and positive 6 G.
Construction
To create the frame, I first imported a file of the firewall. From there, I used the create frame function to put pipes along the guide lines extending from the fire wall. I used stainless steel because it has a high melting point and I knew this would be used in an engine where the temperature would be extremely hot. Also, it is an extremely strong and durable material that could support more than the. Required 250 lbs. After creating my 1 1/2 inch stainless steel ANSI pipes, I mitered all the members than came together at a point. Then, I trimmed to face the members that were sticking through the firewall. Finally, I used the extend tool to make sure the members were properly connected to the firewall since they originally didnt fully connect.
Testing
I needed to simulate my frame in negative 3 G and positive 6 G.
These are my results for negative 3 G. These results show that the most deflection is found in the two beams that connect in the middle and at the point where the 3 members come together. The max deflection is 0.001052 in with a minimum deflection of 0 in. This shows that my structure and material are very strong since the maximum deflection is low.
This is the analysis for my structure under positive 6 G. The maximum deflection is greater than my previous simulation at a value of 0.002096 in and a minimum of 0 in. The areas of maximum deflection are also different, extending from the point of connection between the 3 members out towards the center of all three pipes. My frame is still strong under pressure though with a small value for max deflection.
My design does meet the design criteria. It has 7 fixed constraints, can support 250 lbs distributed at three points, and can withstand negative 3 G and positive 6 G. It is constructed from 1 1/2 ANSI pipes and is connected to the provided firewall. All the points where the members connected were mitered accordingly.
Conlcusion
I enjoyed getting to design framework and found it interesting how it reacted under different forces. I liked getting to simulate my design and find the software impressive that it can provide all this information without having to test the design in real life. Other structures that could be designed and tested could include the wing struts for a plane. They use framework and it would be beneficial to be able to test how much pressure they could withstand with different types of materials.