Week 13 and week 14: Fabricating the Prototype and Work on the Finite Element Analysis

In these two weeks, I focused on building the prototype and finishing up the FEA for the solar rack. For building the prototype, I meet up with my team to fabricate the prototype and to figure out the best way to building the parts faster.

 Below is the progress that I make so far on the hand-calculation drag coefficient and drag lift. These data will be implemented in ANSYS to run for the FEA in next couple days.




Wind analysis including cooling effects and lift prevention.
Dd = Cd⍴ V22A
Dl = Cl⍴ V22A
Where Dd is wind drag  Dd , Dl: drag and lift forces, Cd, Cl: drag and lift coefficient relatively, ⍴ is the density of air, V is velocity of wind which has Vpeak and Vstorm, and A is the reference area or cross-sectional area of the lowest point of calcul.

Wind load calculation has to be calculated using the following values.
⍴ = 1.225 kg/m3 , V could be replaced by Vpeak  = 85 mph (=37.9984 m/s) and Vstorm = 130 mph (=58.1152 m/s), A = 0.93 x 3=2.79 (m2  ).
Cd= 0.3

Cl= -0.5 (at zero angle of attack the pressures on the upper surface are lower than on the lower surface.)
Thus, wind load force for each case is calculated as below.
Ddrag@Vpeak = 0.31.225 37.9984222.79 =740.22 N
Ddrag@Vstorm = 0.31.225 58.1152222.79 =1731.45 N
Dlift@Vpeak =- 0.51.225 37.9984222.79 =-1233.70 N
Dlift@Vstorm =-0.51.225 58.1152222.79 =-2885.76  N
negative lift to mean a downward force rather than an upward force, thus tending to push the canopy toward the ground.

Comments

  1. UnknownJune 9, 2021 at 12:37 PM

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