thomas gutierrez austin shoemaker shane upchurch ryan kaysen joey miller kevin liekweg engineering...
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![Page 1: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/1.jpg)
Thomas GutierrezAustin ShoemakerShane Upchurch
Ryan KaysenJoey Miller
Kevin Liekweg
Engineering Analysis
Mobile Laptop Desk
![Page 2: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/2.jpg)
Agenda
• Free Body Diagram• Free Body Analysis• Deflection Analysis• Materials Selection
Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
![Page 3: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/3.jpg)
Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Free Body DiagramAy
AxPmax
S
Sy
Sx
SSx
Sy
Fbb
Fbj
Cy
Cx
B
Flw
A
B D E
12”
14.5” 14.5”
P
Ѳ
![Page 4: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/4.jpg)
Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Free Body Analysis"These are the given weights in the system"W_b=5 [lbm] "weight of the back pack"W_bj=4 [lbm] "weight of the arms"W_lw=25 [lbm] "weight applied at the laptop center of gravity“
"These are the given dimensions of the apparatus"L_v=15 [in] "vertical distance of back brace"L_1=14.5 [in] "length of first arm"L_2=14.5 [in] "length of second arm"L_lw=0 [in] "center of gravity correction for weight of laptop"L_b=3 [in] "center of gravity correction for weight of book bag"L_t=L_1+L_2
B = Force on waist of userP = Force on shoulders of user
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Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Free Body Analysis
Summation of moments around top of shoulder straps:(1/3)* Lm_v*P-Lm_b*F_b-Lm_v*B+Lm_1*F_bj+(Lm_t-
Lm_lw)*F_lw-Lm_v*C_x=0
Summation of moments around bottom of should straps:(-2/3)*Lm_v*P+Lm_v*A_x-Lm_b*F_b+Lm_1*F_bj+(Lm_t-
Lm_lw)*F_lw=0
Summation of moments around arm joint D:(-2/3)*Lm_v*P+Lm_v*A_x-(Lm_1+Lm_b)*F_b+(Lm_2-
Lm_lw)*F_lw+Lm_1*C_y+Lm_1*A_y=0
![Page 6: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/6.jpg)
Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Free Body AnalysisWorst CaseWith laptop center of gravity (L_lw = 0 [in]) at max distance from user and backpack weight, W_b = 5 lbm.B = 192.3 [N] (roughly 43.1 lbm on waist of user)P = 342.5 [N]No Laptop CaseWith backpack weight, W_b = 5 lbm, and with no laptop placed on apparatus.B = 15.04 [N] (roughly 3.4 lbm on waist of user)P = 71.13 [N]Backpack Weight CaseWith backpack weight increased (W_b = 20 lbm) (i.e. several books in bag) and laptop on apparatus at L_lw = 4 [in].B=59.76 [N] (roughly 13.4 lbm on waist of user)P=277.8 [N] Realistic CaseWith laptop center of gravity 4 inches from end of arms (L_lw = 4 [in]).Also backpack weight increased slightly (W_b=10 lbm) (i.e. about one book).B=118.6 [N] (roughly 26.6 lbm on waist of user)P=291.2 [N]
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Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Deflection Analysis
EI
PL
3
3
)(64
44io ddI
• E = 10000 ksi• P = Load of laptop (At End of Beam)• L = Length of arms (Joint assumed to be rigid)
• Do = Outer diameter of tubing
• Di = Inner diameter of tubing
(Using Aluminum)
![Page 8: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/8.jpg)
Introduction
Free Body Diagram
Free Body Analysis
Deflection Analysis
Materials Selection
Deflection Analysis
• Aluminum tube with 7/8 inch outer diameter and 1/8 wall thickness.
• Deflects 2.25 inches with 60 pounds at end of beam (29 inches)
![Page 9: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/9.jpg)
• Arms: Aluminum Tube 7/8 inch with 1/8 inch wall thickness
• Joints: Plastic• Table: Lexan• Back Support:
Plastic
Introduction
Free Body Diagram
Free Body Analysis
Materials Selection
Materials Selection
Deflection Analysis
![Page 10: Thomas Gutierrez Austin Shoemaker Shane Upchurch Ryan Kaysen Joey Miller Kevin Liekweg Engineering Analysis Mobile Laptop Desk](https://reader035.vdocuments.net/reader035/viewer/2022070413/5697bfe91a28abf838cb7031/html5/thumbnails/10.jpg)
Questions?