Final Project Report “Lucky” Prof: Robert Shaefer TA: James Simonelli Team 13 Jonathan Chang Eujin Chung Brandon Judoprasetijo MAE-94: Computer Aided Design and Drafting Fall 2014 Mechanical & Aerospace Engineering Department University of California, Los Angeles 12/16/2014
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Final Project Report
“Lucky”
Prof: Robert Shaefer TA: James Simonelli
Team 13 Jonathan Chang
Eujin Chung Brandon Judoprasetijo
MAE-94: Computer Aided Design and Drafting Fall 2014
Mechanical & Aerospace Engineering Department University of California, Los Angeles
12/16/2014
ii
Team #13 Picture
Figure 1: Pictured in bottom right (from left to right): Brandon Judoprasetijo, Eujin Chung, Jonathan Chang
iii
Abstract
For years, the task of transporting objects through the use of a rubber band has led to redundant
designs focused on travel by land. This report documents our innovative design that utilizes energy from
a rubber band to generate airflow and lift. First, we will cover the design challenges followed by a review
of other “state-of-the-art” designs available online. Next, we will provide the progression of our design
concepts and the specifications of our final design. Lastly, we will discuss the analysis performed, the
product fabrication process, and our results.
iv
Table of Contents
Team #13 Picture .......................................................................................................................................... ii
Abstract ........................................................................................................................................................ iii
Table of Contents ..................................................................................................................................... iv
Table of Figures ............................................................................................................................................. v
List of Tables ............................................................................................................................................... vii
List of Symbols ........................................................................................................................................... viii
3. Prior Work (“state-of-the-art”) ................................................................................................................. 1
4. Concept Development .............................................................................................................................. 3
12.1 Part Drawings .................................................................................................................................. 27
Table of Figures Figure 1: Pictured in bottom right (from left to right): Brandon Judoprasetijo, Eujin Chung, Jonathan
Chang ............................................................................................................................................................ ii
Figure 2: Example of two car designs where the rubber band gives power to the axle. Left: [1] Right: [2] 2
Figure 3: Airplane design where rubber band powers propeller [3] ............................................................ 2
Figure 4: Chang's first design concept. ......................................................................................................... 3
Figure 5: Judoprasetijo's first design concept. .............................................................................................. 4
Figure 6: Chung's first design concept. ......................................................................................................... 5
Figure 7: Exploded view of all the final parts. ............................................................................................... 6
Figure 8: Pictorial of final product from different views. ............................................................................. 7
Figure 9: Isometric views of the fuselage on SolidWorks (left) and the actual product (right) .................... 8
Figure 10: From left to right: actual 3D printed wheel axles and isometric view of the SolidWorks model 8
Figure 11: From left to right: front and side views of the SolidWorks model of the wheel axle .................. 9
Figure 12: From left to right: final 3D printed wheel product and isometric view of SolidWorks model. ... 9
Figure 13: Isometric views of the actual front (left) and the SolidWorks model (right) ............................. 10
Figure 14: Bottom views of the actual front (left) and SolidWorks model (right) ...................................... 10
Figure 15: Front views of the actual front part (left) and the SolidWorks model (right) ........................... 11
Figure 16: Front views of the actual propeller (left) and the SolidWorks model (right) ............................ 11
Figure 17: Side views of the actual propeller (left) and the SolidWorks model (right) .............................. 12
Figure 18: From left to right: front and top views of the propeller rod on SolidWorks ............................. 12
Figure 19: Side views of the actual 3D printed tail (left) and the Solidworks model (right)....................... 13
Figure 20: From left to right: top and isometric views of the tail part on the SolidWorks model ............. 13
Figure 21: From left to right: an isometric view of the final glider holder and the side view of the
SolidWorks model ....................................................................................................................................... 14
Figure 22: Front view of the glider holder on SolidWorks model ............................................................... 14
Figure 23: Bottom views of the actual glider (left) and the SolidWorks model (right)............................... 15
Figure 24: Top views of the actual glider (left) and the SolidWorks model (right) ..................................... 15
Figure 25: Assembling the rubber band and propeller ............................................................................... 16
Figure 26: The blue arrow indicates how the air will be scooped by the propeller ................................... 17
Figure 27: The red arrow indicates the direction the propeller rotates ..................................................... 17
Figure 28: The blue arrow indicates the flow of air along the entire device; the white arrow shows the
direction of travel ....................................................................................................................................... 17
Figure 29: Displays the total mass and center of gravity of our final device .............................................. 18
Figure 30: Graph of force versus displacement in order to find the spring constant ................................ 19
Figure 31: STL models of various parts ready to add to the pack file ......................................................... 21
Figure 32: Screenshot of the Pack file ready for printing ........................................................................... 21
Figure 33: From left to right: the top, side, and front view of the final product ........................................ 24
Figure 34: From left to right: the top, side, and front view of the final SolidWorks model ....................... 24
Figure 35: Engineering drawing of the front part ....................................................................................... 28
Figure 36: Engineering drawing of the back part ........................................................................................ 29
Figure 37: Engineering drawing of the fuselage ......................................................................................... 30
vi
Figure 38: Engineering drawing of the propeller ........................................................................................ 31
Figure 39: Engineering drawing of the propeller rod ................................................................................. 32
Figure 40: Engineering drawing of the glider part ...................................................................................... 33
Figure 41: Engineering drawing of the glider holder. Two duplicates are used in the final assembly. ...... 34
Figure 42: Engineering drawing of the wheel part. Four duplicates were used in the final assembly. ...... 35
Figure 43: Engineering drawing of the wheel axle part. Two duplicates were used in the final assembly.
Figure 44: Assembly drawing with BOM table ............................................................................................ 37
vii
List of Tables Table 1: Device Dimensions .......................................................................................................................... 6
Table 2: Mass, Force, and Displacement Data for estimating the elastic constant (k) of the rubber band19
Table 3: Data and measurements used to calculate the total potential energy ........................................ 20
Table 4: Data from testing our device ........................................................................................................ 22