Saturday, November 18, 2017

Week 13: Lockheed Martin Presentation

This week, the solar team focused on preparing for the Lockheed Marin presentation. Overall, the team presented well and had a great experience. There were some technical questions from panels at Lockheed Martin, but the team answered them with best efforts.

Saturday, November 11, 2017

Week 11 & 12

For week 11 and 12, we focus more on designing and improving the existing design from Futran. In their designs, the solar panels are 1.6x1 m; therefore, the total length will be more than 9m if we are going to build at least 9m long track.

Figure 1: Assemble of two supporters and a cross canopy.

Figure 1 is an assembling of two supporters and a solar racking system. The new design has two cross trusses that were added to support the weight of the frame and the solar panels.

Figure 2: Using truss that was made out of sheet metal

Using sheet metal to construct the full-scale designs are considered as a low cost and lighter weight compared to I beams. If it was folded correctly it will generate alot stronger structure, thus it's more efficient to use sheet metal for the Spartan Superway than other types of beams.

Figure 4: A different way to connect and have a stronger rectangle truss

Wednesday, November 8, 2017

Week 10

More details are being ironed out concerning the truss design.  The team is currently trying to figure out how to attach the linkages.  The linkages will be made out of sheet metal.  Sheet metal should be considerably easy to bend into the desired "U" shape that is desired for the linkages.  A different option would be to simply purchase the linkages from a place like Home Depot. Much time is being spent in Solidworks at the moment.

Monday, October 30, 2017

Week 9: Second Presentation

Connecting method between truss and track have to be figured out.
Also, figure out how to connect truss structure with shell design on top.
Use angled bracket instead of bending metals to save materials.
Solar panel comparison was not correct: Polycrystalline falls into the category of Monocrystalline.

Thursday, October 19, 2017

Week 8

For this week, solar team successfully calculated the power that is needed for the 9 m track.  Since we are going to build 9 m long horizontal track, some of the values are changed to meet the requirements, especially the elevation force.

elev_comp = 0 #(1/n_bar)*n_t*M_v*(g*z)
aux_comp = 0 #n_t*P_aux*t_s
M = 400 #(kg) Mass of fully loaded ATN vehicle
P_aux =0 # previous 3500.0 auxiliary power, W (see Wikipedia for auto air con)

V_l = 1.5 # line speed, m/s V_w = 1.5 # average wind speed, m/s

** Energy per vehicle **
Energy required, E(t_s) = 8.70e+02 J
Average trip time, 0.5 minutes
Average power, P_avg = 32 W

>> Energy per 150 vehicles <<
Energy required, E(t_s) = 1.305e+05 J
Average trip time, 0.5 minutes
Average power, P_avg = 4.73e+03 W

KE loss = 3.71e+02 J ---> 42.6%
Air drag loss = 2.26e+01 J ---> 2.6%
Rolling resistance loss = 4.77e+02 J ---> 54.8%
Aux power loss 0.00e+00 J ---> 0.0%

 Based on the power was calculated below, there are some of possible solar panels that can be used for the  full scale solar design.

18 panels x 169.99= 3059.82



Wednesday, October 4, 2017

Week 7

The time normally reserved meeting and brainstorming was spent listening to a lecture from Professor Du and taking a quiz on project report writing guidelines.  The time that was left for class was spent discussing the discrepancies in the energy calculations.  The team is currently attempting to reverse engineer the required power input equation of the full-scale track, which was approximately 5.61*10^6 kWh.  As of right now, the team is still off by about 100,000 kWh for the power calculation, which is no small discrepancy.

More design details were discussed in a meeting with Dr. Furman, who encouraged the team to continue pushing out design ideas and sketches as rapidly as possible.  Putting out a high number of sketches should be an effective method for generating ideas.

Tuesday, October 3, 2017

Week 6: Energy Calculations | Initial Design Plan

Two documents were utilized to compute the calculation
1) 2016-06-13.BJF.EnergyCalculation.pdf
2) Case Study of a Solar Power Installation for an Automated Transit Network in San José by Leonardo C. Branco, Eric L. Rosenfeld, Durval Marques de Queiroz Neto, and Burford J. Furman

Below is the group's work/discussion for the week.

1. Performed energy calculations. Energy Calculation was computed to be 3.51E+06 kWh or J (=3510000 kWh or J) while the value on the pdf file was 3.68E+06 kWh or J (=3680000 kWh or J). We used Microsoft Excel to calculate the value. The team is unclear about what the ρ (rho) value would be in the equation. In the pdf file, rho value was given as 1.275 kg/m^3, which is the density of the air on page 5, as well as motor efficiency on page 2. Our team computed the calculation using 1.275 kg/m^3 for rho value.

2. Energy calculation result needs to be confirmed by Dr. Furman on 10/4 Wednesday so the team could start working on CAD model using Solidworks by the end of this week.

3. The team needs to figure out how to connect/attach the solar panel rack onto the guideway.

4. Ask Dr. Furman about admission ticket to TechShop San Jose to explore possible methods to connect rack onto the guideway.