Senior Design - Capstone Project Presentation
-
Upload
daniel-fiset -
Category
Documents
-
view
53 -
download
1
Transcript of Senior Design - Capstone Project Presentation
![Page 1: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/1.jpg)
April 25, 2016Mr. MP SpiererCaterpillar CMDCEast 1167 NC-42Clayton, NC 27527
Design Performance Report (Team 4)
Dear Mr. Spierer,Team 4 is pleased to present the attached report detailing the performance of the final design that has been created in order to solve the problem of the stick-slip phenomenon observed in the current decel pedal used in Caterpillar’s small bulldozers. To date the team has put in 487 hours towards this project altogether and was expecting to be at 560 hours at this point. Team member Junjie Zhang has contributed 94 hours, Brandon Felts has contributed 103 hours, Michael Mastrianni has contributed 85 hours, Philip Bell has contributed 97 hours, and Dan Fiset has contributed 108 hours. We look forward to presenting the information in this report and some of our other findings to you.
Sincerely,
Brandon Felts Dan Fiset Michael Mastrianni Philip Bell Junjie Zhang
![Page 2: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/2.jpg)
K2 Series Small Dozer Decelerator Pedal Design - Performance Review
Team 4 Junjie Zhang
Michael MastrianniBrandon Felts
Philip BellDan Fiset
![Page 3: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/3.jpg)
Presentation Overview1. The Problem2. The Goals3. The Approach4. Final Design Overview5. Goal 1: Slow Speed Force Variation6. Goal 2: High Speed Force Variation7. Goal 3: Range of Pedal Motion8. Goal 4: Natural Frequency9. Goal 5: Less than 2’’ of Deflection for 800lb Loading 10. Goal 6: Pedal Position with Respect to Bulldozer11. Pedal Cost12. Possible Improvements13. Questions and Comments
![Page 4: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/4.jpg)
The Problem
• Unwanted stick-slip behavior of K2 series bulldozer deceleration pedal
• Prevents precise minor adjustments
![Page 5: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/5.jpg)
The Goals1. Slow Speed Force Variation - 20%
2. High Speed Force Variation - 17%
3. Range of Pedal Motion - 18.7%
4. Natural Frequency 15 Hz - 18.9%
5. Less than 2’’ (50.8 mm) of Deflection for 800lb Pedal Loading - 12.5%
6. Pedal Position with Respect to Bulldozer - 12.9%
![Page 6: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/6.jpg)
The Approach
Design 1: Spring Only• Pro: Good Slow Speed Force Modeling• Con: No Damping
Design 2: Spring and Damper• Pro: Good Slow Speed Force Modeling• Con: Heavy-duty Spring (too strong)
![Page 7: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/7.jpg)
The Approach
Design 3: Spring and Gears• Pro: Thinner Gauge Material Pedal• Con: Complex Gear System
Selection:Design 1 - Low-Profile, Flange-Mount Ball BearingsDesign 2 - Spring and Damper SystemDesign 3 - Thinner Gauge Material Pedal
![Page 8: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/8.jpg)
Final Design Overview• Low-Profile, Flange-Mount Ball Bearings
• ¼ Inch-Thick Sheet Steel Pedal Arm
• Bent Support Under Foot Plate
• Two 31 lb/in Extension Springs
• Damper (c=2460 Ns/m)
• Slotted Link to Control Motion
![Page 9: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/9.jpg)
Final Design Overview (Cont.)
![Page 10: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/10.jpg)
Goal 1: Slow Speed Force Variation
Force to Start Motion ~ 110N (82N)Force to Complete Motion ~ 145N (110N)
![Page 11: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/11.jpg)
Goal 2: High Speed Force Variation
![Page 12: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/12.jpg)
Goal 3: Range of Pedal MotionMax Displacement (from Potentiometer)
• ~12.49°
Actual Linear Travel (due to 190 mm arm)• 41.4 mm (about 10 mm more than expected)
![Page 13: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/13.jpg)
Goal 4: Natural Frequency
● Frequency of Dozer Cabin○ ~15 Hz
● Natural Frequency from Slam Test
○ ~20.94 Hz
![Page 14: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/14.jpg)
Goal 5: Pedal Deflection
• 3mm of deflection for 30lb
• 80mm deflection for 800lb
• 3.15in deflection for 800lb
![Page 15: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/15.jpg)
Goal 6: Pedal Position
190mm from shaft to center of footplate (181.5mm)50deg from vertical (57.7deg)
156mm from edge of bracket to footplate edge (156mm)
![Page 16: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/16.jpg)
Cost
![Page 17: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/17.jpg)
Possible Improvements
Lower initial spring deflection Secure Spring Link Bolt
![Page 18: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/18.jpg)
Questions/Comments
![Page 19: Senior Design - Capstone Project Presentation](https://reader033.fdocuments.us/reader033/viewer/2022052705/5883d0611a28abb7308b674b/html5/thumbnails/19.jpg)