Catalog Description: (Prerequisites - MA 111) Covers two- and three-dimensional force systems, equilibrium, structures, distributed forces, and strength and elastic deflection of engineering materials due to loads applied axially. Emphasizes free-body diagrams.
Spring 2012-2013 Project
Your objective is to design a lightweight link for a landing gear mechanism that will allow the landing gear to safely retract to a specified angle.
Figure 1 shows a typical landing gear mechanism used to retract the wheel into the wing near the fuselage. Initially, the strut is vertical. After retracting, the strut must be held at an angle of 10° below the horizontal.
Figure 1: Typical landing gear mechanism.
(1: Hydraulic Ram, 2: Hinge Mechanism, 3: Strut, 4: Wheel Boss, 5: Wheel, 6: Fuselage/Wing. Source: http://commons.wikimedia.org/wiki/File:Landing_gear_schematic.svg)
Figure 2 shows a schematic of the prototype mechanism which we will use in this project.
Figure 2: Typical landing gear mechanism.
You will design the link that initially holds the wheel and strut in the vertical position, and allows the wheel to be lifted up into the retracted position. One end of the link is joined to the shackle by a shoulder screw, and the shackle is pinned at one of 7 possible hole locations on the strut. You will get to choose which hole you will use. The other end of the link is joined (again by a shoulder screw) to the long link on the driven arm of the landing gear mechanism. The diameter of the shoulder screws is 0.250".
The SolidEdge files and drawings that describe the geometry of the landing gear mechanism are provided on the "Project" page on the course website. The prototype mechanism is in the front of the Rotz Lab. You are encouraged to visit the Rotz lab to view the mechanism.
The material that you will use to create the link is Nylon 6/6 sheet (a rigid plastic). We supply the material, and the thicknesses available to you are 0.062 inches, 0.093 inches, and 0.125 inches. The manufacturer's material property data sheet has been posted on the Project files and info page, along with tensile test results for specimens fabricated from Nylon sheets purchased for these projects in recent years.
There will be a contest to determine whether or not your link meets the design requirements without failing, as well as to determine the performance portion of your grade.Date: Wednesday May 15
Location: Myers M137 Lecture Hall
Times: by section
If your team cannot have at least two team members present during the assigned section time, we can move your group to compete with a different section. However, this must be arranged in advance-no later than Monday May 13.
If your team cannot have at least two team members present during the assigned section time, we can move your group to compete with a different section. However, this must be arranged in advance--not later than Monday May 16.
Grading:Design Review: 25%
Report (Documentation): 50%