Pre-Engineering



Engine Mount Inventor BuildJae hwa Hong and Eli rush PLTW Aerospace Engineering Worcester Technical High School April 5, 2017AbstractTable of ContentsProblem Statement To design a frame assembly of a motor mount for a Lycoming O-300 engine that will be installed in an aircraft. The following criteria must be met: a. The large plate represents the aircraft firewall as shown in the image below. This must be grounded as the stable part of the frame. Use fixed constraints on the six firewall to structural member attachment points.b. The structure will support one Lycoming O-300 engine (250 lb) attached at the three points indicated.c. The structure will be loaded with negative 3 G and positive 6 G which is simulated by exaggerated engine weight due to sudden aircraft acceleration or a change in attitude.d. The structural members will be 1 ? in. ANSI pipe.e. Frame members should be mitered as necessary.With this in mind, the forces exerted on the frame must also be tested under gravity, weight, and lift. A gravity test of the force of gravity when the plane would be on the runway must be conducted. A Negative 3 G force must be applied to simulate the effects of lift as the plan goes into flight. A Positive 6 G force must be tested to simulate the force when the plan is generating weight in flight. These all apply to an Aerospace engineering student as one will need to be able to show material strength, forces on an object in flight, and construction of a power plant cell that can maintain the forces of flight. ProcedureFirst, student researched different materials in order to decide which material we should use for our engine mount.Then, student simulated the lab to identify the strengths and weaknesses of each materials.By doing inventor tutorial (2.1.2), student learned how to design the framed using certain functions such as miter, trim to face, and change the measurement of certain parts.Then, student did another tutorial that explains how to do a frame analysis on our engine mount.Finally, student downloaded the engine frame to design our final engine mount. Then, student simulated the frame analysis to see the distribution of stress on the engine mount.Design Solution The design we created met the criteria by having a firewall that would be grounded. This firewall also had to be designed in the way of being able to have certain pipes attached to it. There also had to be certain force tests conducted, a 3 G, 6G, and normally. All of these were conducted and the images are located at the end of this report. The pipes had to be 1 1/2in. ANSI pipes as we made sure we had on our structure before conducting the tests. Finally, we had to use miter joints and trim to frame to make sure our structure could support the physical world and not have anything disobey the physical laws of the world we live in. ResultsThe student completed our project with several trials. The hardship was student did not know which constraints to put on our engine mount. When student tried different constraint (fixed, pinned), the result was different each time and unreliable. And, the instruction for this project was not clear enough to do a frame analysis. In the future, student will spend more time to design the engine mount or any part to be most efficient.ConclusionWe examined many things throughout these procedures. What we learned as a whole was how stresses affect certain materials as well as how these mounts are made. When conducting the project, we applied the different stresses that were required in the constraints. With this being conducted we learned how the different stresses affect the way the frame bends and reacts. With this in mind, we also can apply what we learned to future projects. We can apply that the different forces that affect an object and the materials vary widely, and that when building future projects in Inventor how when put into use, there can be forces applied on it that we weren’t expecting. In conclusion, we learned how forces are applied to our certain frames, and how to apply them to further discoveries. 95251162051G6 G-3 G ................
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