...
The front landing gear had cutouts applied so that the weight of the part can be reduced.
Objective of Sim
[The goal of the sim is to ensure that the cutout holes do not reduce the integrity of the part enough so that it would fail on landing.]
Simulation Setup
Assumptions and Preliminary Calculations
...
Trial # | Maximum Stress (MPa) | Min Safety Factor | Screenshot |
|---|---|---|---|
1 | 138.17 | 1.72 |
    |
2 | 154.83 | 1.3402 |
     |
3 |
|
|
Could also include minimum safety factor.
Conclusion
The landing gear will be able to survive landing
Author: Ben Lovegrove 10/11/2024
Sims for Front Landing Gear with Triangle Holes
Simulation Setup
Assumptions and Preliminary Calculations
Assuming that Eclipse is 5kg
Fg = 5(9.81)
= 49.05
Applying a safety factor of 3, 150 newtons was applied to the part
Used Aluminum Alloy
Applied Loads
Load was applied to both axle holes
Fixtures
The mounting holes are the fixture for the test.
Mesh
Trial # | Mesh Parameters | Screenshot |
|---|---|---|
1 | Element size: 2mm # of nodes: 24269 |
 |
2 | Element Size 1mm Nodes: 93681 |
|
Results
Trial # | Maximum Stress (MPa) | Min Safety Factor | Screenshot |
|---|---|---|---|
1 | 111.83 | 2.50 |   |
2 | 144 | 1.9 |
  |
Conclusion
The landing gear will be able to survive landing
Author: Ben Lovegrove Date: 10/11/2024
Validation of Servo
Assuming that Eclipse is 5kg
Fg = 5(9.81)
= 49.05
Distance of rear landing gear to front landing gear = 676
Distance of front landing gear to CoM = 176
Moment = .176(49.05) - FN (.676)
0 = .176(49.05) - FN(.676)
FN(.676) = .176(49.05)
FN = 12.77N
Assuming coefficient of friction between concrete and foam is 1.8 (twice that of sliding friction, professor said that it would be higher than sliding friction)
radius = .037
Mass Moment of Inertia (xx direction) = 0.038527
alpha = angular velocity, assuming 1radian/sec
Torque = 1.8FN x r + I x alpha
= 0.889 Nm
Servo is 0.297Nm
So we need to select a new servo
Author Ben Lovegrove
Rear Landing Gear
Objective of Simulation
Validate the rear landing gear.
Assumptions and Preliminary Calculations
Assuming that Eclipse is 5kg
Fg = 5(9.81)
= 49.05
Distance of rear landing gear to front landing gear = 676
Distance of front landing gear to CoM = 176
Moment = .176(49.05) - FN (.676)
0 = .176(49.05) - FN(.676)
FN(.676) = .176(49.05)
FN = 12.77N
Using Aluminum Alloy
Applied Loads
Load was applied to the far servo holes
...
Fixtures
The mounting holes are the fixture for the test.
...
Mesh
Trial | Mesh Parameters | Screen Shot |
|---|---|---|
1 | Element Size 1mm Nodes 29744 |
|
2 | Element Size .5mm Nodes 125884 |
|
Results
Trial | Max Stress | Min Safety Factor | Screenshot |
|---|---|---|---|
1 | 97.386 | 2.5671 |
|
2 | 110.77MPa | 2.2569 |
|
Author: Smile Khatri 2024/11/13
Awesome work so far, super happy to see the engineering work you’ve put into the landing gear! Some next steps:
Where are we getting the servo attachment disk from? Do you have a specific part #?
Can you look into which servo we should order?
Other than that, the rest looks good. Best way to find out if it works is by making it and testing it!
Author: Ben Lovegrove 2024/11/16
Here’s the part I found for the attachment, it’s on amazon
The new servo I think we should use is the ds3235, it has twice the torque we need and we have it in the bay.
Servo there’s a link to the specs of the part.