1. Garage Door Design Analysis
Daniel Meyer
Nadeem Ansari
Yishan Zhao
Justin Bridges

2. Garage Door Design Analysis Presentation Outline
Problem Statement
Design Aspect (Analysis, Optimization Methods).
Design Aspect (Simulations, Results)
Conclusions

3. Garage Door Design Analysis Problem Statement
1) Determine the physical parameters of the door panels.
2) Investigate the motor and make recommendations on the selection based on power required, power output, noise, speed, cost, life cycles.
3) Investigate the design of the roller chain assembly and make recommendations on the selection based on power required, power output, noise, speed, cost, life cycles.
Figure 1: Basic 4 panel garage door
Figure 2: Motor and chain assembly

4. Figure 3: Motion of the Garage Door at 3 stages
Garage Door Design Analysis Design Aspect (Analysis, Optimization Methods).
Physical parameters of the garage door
8 feet wide & 7 feet high
Overall door weight 110 pounds
4 panels= each 21 inches in height
Overall weight of each panel=27.5 pounds
Torsion spring= 302 Stainless Wire A313
Assumptions for analysis
No friction between the wheels and the track
Weight acts from the center of the panel
Roller bearings have no friction
Velocity of the door is constant as it travels up
Force applied to connecting arm
Figure 3: Motion of the Garage Door at 3 stages

5. Garage Door Design Analysis Design Aspect (Analysis, Optimization Methods): FBD of the Door

6. Garage Door Design Analysis Design Aspect (Analysis, Optimization Methods):
Relationship of panel to track curve:
Radius of the curve is smaller than the length of a single panel--allows only a single roller to be in the curve at a time.
One roller means there will be a maximum of two panels in the curve.
Setting the arc length to inches allows a single roller to complete the entire arc while the panel is at a 45 degree angle
Arc length= inches
Figure 8: Relationship of panel to track

7. Figure 11: Angle relations of panels
Garage Door Design Analysis Design Aspect (Analysis, Optimization Methods):
One roller means there will be a maximum of two panels in the curve.
The overall weight of two panels is decreasing at different rates inside the curve.
When the second panel enters the curve, the 45 degree angle where the first panel is located will increase proportionally. (example if panel (2) is at 5 degrees, panel (1) is a 50 degrees.
To visualize this the displacement angles are taken from the center of the arc to the center of the panels
These angles are equal to the vertical displacement the panel undergoes as it moves throughout the curve (β = Φ)
Figure 11: Angle relations of panels
in succession

8. Garage Door Design Analysis Design Aspect (Torsional Spring):
The torsion spring supported by spring coils, stationary cone and a winding cone
spring is mounted on a stationary metal shaft located above and parallel to the top of the garage door frame.
The spring extend along the shaft, and work by twisting as the garage door closes by means of cables attached to each side of the lowest garage door panel.
Metal shaft supported by roller bearing which allows the shaft to spin smoothly
Spring force=3.8 lbf/in
Max force acting on bearings=46.4 pounds
Bearing selected: 1’’ bore, 2’’ outer diameter and support a load up to 400 lbs

9. Garage Door Design Analysis Design Aspect (Trolley Arm):
Convert to a 2-force link
Length – in
Trolley Force Exerted on Door
The maximum force required by the motor will occur at one of two points:
When the door is completely closed.
When the door is fully open.
This force is a function of the angle maintained by the trolley arm

10. Garage Door Design Analysis Design Aspect (Force to Raise Door):

11. Garage Door Design Analysis Design Aspect (Force to Raise Door):

12. Garage Door Design Analysis Design Aspect (Force to Raise Door):

13. Garage Door Design Analysis Design Aspect (Chain Selection):

14. Garage Door Design Analysis Design Aspect (Chain Rail):
Number of Teeth (Driving) – 7
Number of Teeth (Driven) – 9
Sprocket Speed – 150 rev/min
Pitch – 0.5 in
Angle of Articulation – 25.71
Center-to-center distance – 98 in
Length of Chain – 200 pitches
Max Chain Tension – lbf
Max Horsepower required – hp
Chain Velocity – ft/min

15. Garage Door Design Analysis Design Aspect (Simulations, Results):
Motor Selected
1/3 hp – motor
Cost – $ 250
Life cycles - 5 years
Noise – less noise than ½ hp motor

16. Garage Door Design Analysis Conclusions:
Summary of Design Aspect
Based on the parameters of the garage door, an affordable 1/3 hp motor can be selected.
Due to low tooth number for the sprockets, the chain will be quieter throughout the motor process because the chain has less contact with the sprocket.
Extra info
Recommendation of the solutions