8.75 ft. in dia. 2.5 ft. high, chairs 12, 1.625 ft. diameter, 1.5 ft. high.
If you need the CAD files or want to buy the design for commercial (Building, and selling) use, contact via this account or mail to fadoobaba@live.com
Tuesday, 18 March 2014
Monday, 17 March 2014
Comparison between Down-Force and Drag Produced by a Legacy Spoiler VS a Spoiler with Tubercles (Humpback Whale Fin's Inspired)
Following
data was obtained from Simulations carried out in SolidWorks Flow Simulation
Premium.
Without Bumps
|
||
Air Speed in Km/h
|
Down Force in N
|
Drag in N
|
120
|
98.682
|
33.234
|
110
|
82.88
|
27.957
|
100
|
68.266
|
23.02
|
90
|
55.299
|
18.668
|
80
|
43.529
|
14.697
|
70
|
33.284
|
11.255
|
60
|
24.438
|
8.272
|
50
|
16.982
|
5.769
|
40
|
10.83
|
3.688
|
30
|
6.08
|
2.081
|
20
|
2.681
|
0.929
|
10
|
0.648
|
0.235
|
With Bumps
|
||
Air Speed in Km/h
|
Down Force in N
|
Drag in N
|
120
|
108.238
|
30.47
|
110
|
90.599
|
25.549
|
100
|
74.818
|
21.047
|
90
|
60.423
|
17.014
|
80
|
47.695
|
13.443
|
70
|
36.441
|
10.27
|
60
|
26.682
|
7.532
|
50
|
18.504
|
5.228
|
40
|
11.82
|
3.352
|
30
|
6.613
|
1.886
|
20
|
2.909
|
0.841
|
10
|
0.685
|
0.211
|
Comparison between
Down Force and Drag
Air Speed in Km/h
|
Percentage Less Drag
|
Percentage More Down Force
|
|
120
|
8.32
|
8.83
|
|
110
|
8.61
|
8.51
|
|
100
|
8.57
|
8.76
|
|
90
|
8.86
|
8.48
|
|
80
|
8.53
|
8.73
|
|
70
|
8.75
|
8.66
|
|
60
|
8.95
|
8.41
|
|
50
|
9.38
|
8.23
|
|
40
|
9.11
|
8.38
|
|
30
|
9.37
|
8.06
|
|
20
|
9.47
|
7.84
|
|
10
|
10.21
|
5.4
|
|
It
is clear that the spoiler with humpback whale's fin's inspired profile not only
produce more down force at a particular velocity but also less drag.
Data for Spoiler without
Humpback Whale's Fin's Inspired Bumps:
Wing
Span: 100 cm
Chord
Length: 17.5 cm
Air
Velocity: 0-120 Km/h head on
Vertical
Pitch: 22.5 Degree Downwards
Gravity
Considered
Fluid:
Dry Air at STP
Mesh
Settings: Coarse (3/10)
Data for Spoiler with
Humpback Whale's Fin's Bumps:
Wing
Span: 100 cm
Chord
Length Large: 17.5 cm
Chord
Length Small: 15.75 cm
Air
Velocity: 0-120 Km/h head on
Vertical
Pitch: 22.5 Degree Downwards
Gravity
Considered
Fluid:
Dry Air at STP
Mesh
Settings: Coarse (3/10)
Let's
now take a look at visual representation of data.
This Plot Shows
Air Velocity VS Drag, Down-Force by the Spoiler without Bumps
This Plot Shows
Air Velocity VS Drag, Down-Force by the Spoiler with Bumps
As
you can see from above two plots; the spoiler with the whale's fin like profile
generates more down force and less drag.
This Plot Shows
Air Velocity VS Down-Force Generated by the Spoilers
The
green line represents the Down-Force generated by the spoiler with whale's fin's
inspired design. It is around eight percent more at each velocity.
This Plot Shows
Air Velocity VS Drag Generated by the Spoilers
The
green line represents the Drag generated by the spoiler with whale's fin
inspired design. It is around nine percent less at each velocity.
This Plot Shows Air
velocity VS Down-Force to Drag Ratio
It is clear from this plot that Down-Force to Drag ratio is around sixteen
percent more for whale's fin's inspired spoiler than the legacy one at each
velocity.
A simple stress analysis was carried out on both spoilers at 120 Km/h. FOS was greater than 1 for both cases.
This Plot Shows Air Flow Around the Spoiler without Bumps at 120 Km/h from the Right Side.
This Plot Shows Air Flow Around the Spoiler without Bumps at 120 Km/h.
This Plot Shows Air Flow Around the Spoiler with bumps at 120 Km/h.
This plot Shows Air Flow Around the Spoiler with bumps at 120 Km/h.
A simple stress analysis was carried out on both spoilers at 120 Km/h. FOS was greater than 1 for both cases.
Advantages of Spoilers:
The main benefit of installing a spoiler on a car is to help it maintain traction at very high speeds. Particularly at speeds around 90 Km/h. A car with a spoiler installed will be easier to handle at highway speeds. Rear spoilers such as the one's analysed in this study; push the back of the car down so the tires can grip the road better and increase stability. It also increases the braking ability of the car.
To build the prototypes and complete the study further, I need donations. To donate your part send an email to fadoobaba@live.com , tweet @fadoobaba, PM at https://www.facebook.com/ThreeDimensionalDesign orhttps://grabcad.com/fahad.rafi.butt or comment with your contact details and I will contact you!. Thank you for reading!
Do comment and share!
To build the prototypes and complete the study further, I need donations. To donate your part send an email to fadoobaba@live.com , tweet @fadoobaba, PM at https://www.facebook.com/ThreeDimensionalDesign orhttps://grabcad.com/fahad.rafi.butt or comment with your contact details and I will contact you!. Thank you for reading!
Do comment and share!
Tuesday, 10 December 2013
Fully Define the Sketch
Every part should have sketch(s) that is fully defined and extremely easy to edit, always remember, at school no one will read your sketch, not even the professors for grading, but in CAD, especially CAM firms other engineers and technicians will need your sketch to be as clear as possible and as much easy to edit as possible.
Use relations and construction lines, instead of dimensions where ever
possible, NEVER link part sketch(s) to external (other) parts in an assembly;
it is considered a very bad practice everywhere! Because if someone goes in and
changes the "external" part, the original part changes due to this,
which messes up the whole assembly.
Fully defining a sketch, it is always easy to just whack dimensions
everywhere, but fully defining properly takes a lot of time which means a lot
more money to the client to pay but stick with it, remember it is you who have
to modify it later if needed, make a fully defined sketch now and save the
trouble later.
The only way you would not fully define a sketch was if you are doing
"recreational" modeling or something. In real work always define the sketch.
It is a nightmare to make changes (for others) to parts that were created by
you by using sketches that were not always fully defined. Being able to edit by
another engineer should be a high priority.
Minimize the use of 3D sketches.
Thursday, 7 November 2013
Free Solid Works Tutorials
The links for free solidworks Tutorials are given below. Education shall always be free for all!
More will be uploaded as the time passes by.
1. SolidWorks 2014, Tutorial to create a Key Ring, 3D Printing ready! HD
http://dai.ly/x16md94
2. SolidWorks 2014, Tutorial to create a Key Chain, 3D Printing ready! HD
http://dai.ly/x16mdym
3. SolidWorks 2014, Tutorial to create a Double Helical Gear, 3D Printing ready! HD
http://dai.ly/x16ki91
4. SolidWorks 2014, Tutorial to create BBQ Presentation Dish, 3D Printing ready! HD
http://dai.ly/x16ka1j
5. How to Create a Spring,, SolidWorks 2012, using Sweep Revolve,, Tutorial HD
http://dai.ly/x16k2kx
6. How to Create a Bent Spring, using Sweep Revolve, SolidWorks 2012, Tutorial HD
http://dai.ly/x16k28z
7. SolidWorks 2012, RC Aircraft Full Tutorial, HD
http://dai.ly/x16k1vv
8. Solidworks 2012,, Tutorial, Wrap Feature,, HD
http://dai.ly/x16k1d6
9. SolidWorks Simulation Premium 2012, Meshing Tips,, HD
http://dai.ly/x16gxz6
10. Shear Force and Bending Moment Diagram Tutorial,, SolidWorks Simulation Premium 2012,, HD
http://dai.ly/x16gxic
11. Cam Mate Tutorial,, SolidWorks 2012,, HD
http://dai.ly/x16gx7g
12. Tutorial: How to create a Rack in SolidWorks 2013,, HD
http://dai.ly/x16gphh
13. Tutorial: How to create a cloth hanger (using sweep) in SolidWorks 2013,, HD
http://dai.ly/x16gp24
14. Tutorial: How to create a cloth hanger (using extrude) in SolidWorks 2013,, HD
http://dai.ly/x16fqyz
15. Tutorial: How to create a Tee with Ribs in SolidWorks 2013,, HD
http://dai.ly/x16fqly
16. Tutorial: How to create a Propeller in SolidWorks 2013,, HD
http://dai.ly/x16fqes
17. Square Spring Tutorial,, SolidWorks 2013,, HD
http://dai.ly/x16gqga
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