Wednesday, 13 August 2014

Tips for Saving Water Amid Water Crisis in Pakistan

It is pretty clear that water reserves in Pakistan will be reduced to one half of what they were on 11 August 2014 in next 6 years. Since the government is not doing anything serious about it, here are some ways in which us the common people can contribute to help save water for our future generations and to prevent sever draught conditions post 2020 AD.
 
If we manage to follow these very simple guidelines, according to a rough estimate, each of us can save up to ~18 cubic meter of water a year (that's ~18,000 Liters a year), multiply it by our population, it will be 3,240,000,000,000 Liters of water a year, i.e. 3,240,000,000 cubic meter of water a year. In comparison capacity of world's largest earth filled dam (Terbela Dam) is 13,690,000,000 cubic meter. so we'll save water equivalent to Terbela Dam's capacity every 4 years.

 
  • Water your lawn at night. It is common sense that water evaporates quickly during the day time because of the sun, so sprinkle when it’s more likely to stay in the soil.
  • Do not use a dish washer. A common Pakistani person may not have even heard the term dish washer, but some of us have and some of us use them too. Most dish washers use 1,000+ Watt of electrical power, if you have to use a dish washer use a solar powered one. To wash the dishes, fill a ~6 Liter bottle with water and use it to rinse and soap the dishes, then use tap directly to wash them, as quickly as possible.
  • Some of us are privileged enough to have a swimming pool in our homes, we should cover them to prevent contamination of water and evaporation accelerated by the Sun during the day time. Buckets, tubs lying in the open should be covered as well.
  • Do not go to the car wash. Car washers in petrol stations or dedicated one's, both use ~200 Liters of water per car wash, you can wash your car at home by using ~4 buckets of water, ~25 liters each. Wash and rinse one fourth of your car with each bucket, starting from roof and ending at the rim/tire. You can wash your car up to 3 times a year at home, still using less water than washing station. If you have to use a car wash, use it no more than once a year.
  • This one is especially for home owners, collect the rain water. Make an underground tank in your home, under the lawn or the back yard, save water in it, then use water filters to use that water for toilet use or to wash your car or water the plants/lawn, even drinking and cooking after boiling.
  • While brushing teeth, shaving, soaping your body while bathing, turn of the tap. While bathing it is preferable to not to use the shower, use old school tub and mug combo. In winters especially, do not waste cold water while you wait for hot geezer's water, collect that in separate bucket and reuse as necessary, or use instant electric geezers near to the taps/showers (minimum piping). Check out your toilets for leaks. Pour some color in the flush tank, if there is a leak, the color will help you verify it. Fix it if necessary, replace the toilet if unfixable.
  • Wash your carpets once a year. While washing clothes, use appropriate amount of washing powder so you don't have to rinse them again more than twice.

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.



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!

Tuesday, 10 December 2013

Fully Define the Sketch




some tips regarding good sketching practices.

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