10/16-10/30

The last two weeks have been spent getting ready for the end of the semester in terms of getting together a BOM for all the parts that will be needed as well as working on the 3rd set of presentations, and the rough draft of the final report. I've been working on the presentation and trying to get that finished while working engineering drawings that will go into the final report. There are a million parts that are going into our assembly, and all of them need drawings to reference when we start to build in the Spring. 1/30

figure 1. BOM for Half-scale Bogie, Steering, and Failsafe.

figure 2. Sample Engineering Drawing for Bogie part

11/9-11/16

This week I was spent my time working on the gear housing for the steering system as well as the linkages that control the up steering arm. I am also working on cutting out the second prototype out of wood since I adjusted some of the dimension from the last prototype. The hope is that validate the dimensions we choose and the bogie will not bind on the track. I also had to completely redo the housing assembly half way through this blog and that is why I stopped writing it. I will get back to work and try to have a complete model done as soon as possible.

10/2-10/9

This week was spent working engineering drawings that are to be used next semester for manufacturing. I am also working to finalize the BOM in order to meet the November 15th deadline. I am also continuing to support the propulsion subteam with placement of components as well as suspension. I am also working with Jorge to make sure that the gear housing for the steering will work for how we need it. Overall, there is lots of work still to be done, but we are working to get all of it done. We will meet today with Bengt to discuss current design progress and work on any design suggestions that he might have.

10/26-11/2

This week I worked on finalizing the presentation by adding initial hand sketches for design work, and practicing the presentation. I also began working on FEA of the failsafe in order to determine whether or not the initial design would withstand the impact forces of the bogie falling. These impact forces can be seen in figure 1.

figure 1. impact force calculations. Once I knew the force of the impact, I used Solidworks FEA to come up with the stresses within each failsafe. This can be seen in figure 2.

Figure 2. Von Mises Stress within the Failsafe Overall, this was a productive week.

10/19-10/26

This week was spent working on the linkages for the steering mechanism and finalizing the design for the bolt on Failsafe. I also moved the universal joint from just below the main hub wheels to below the lower steering arms. My partner still has not been able to get SolidWorks to work on his part, and so both parts have fallen onto me. This is a lot work, and so I am falling a bit behind in terms of Gantt schedule. I will, however, keep working and try to stay up to schedule.The following figure is the current configuration for the Bogie with steering and failsafe.I am also haveing to work really closely with Propulsion and braking, and so I will try to keep up to schedule.

10/12-10/19

This week I helped propulsion come up with their final motor design and started working on coming up with a second version of the lower steering arm. There were interference problems with the bogie and the steering arm. The Cad that was made for the arm was also very messy and changes needed to be made that the made corrupt geometry. I also started working on the funding application for the SJSU fund. I am finding it interesting trying to juggle both my officer position and position as leader of the half scale team. I have lots of design work to complete, and I am making good progress, however, my group is having lots of issues that could become problems in the future. My partners solidworks is not working leaving all the CAD work on me, and propulsion and wayside are having issues trying to find out how voltage and current specs. Next week the second round of presentations start, which brings with it lots of work. We will all need to stay on top of everything as to have enough time to finish by the end of the semester.

10/5-10/12

This week I have been working on getting the Bogie CAD changes together. I am currently working with propulsion on motor and gear placement because it will determine the room allowed for the steering arm linkages. In addition, I've redesigned the universal joint in order to be able to place it in-plane with the drive wheels, This changed the mounting points, and will mediate any levers creating the load of suspension and cabin. I've also been working on the idea of having swing arms that wheels attach to and have small dashpots to allow for damping in the horizontal direction, however, I have not been able to find a supplier for what are essential micro shock absorbers. This may be a design that would go into the full scale, but not the 1/2 scale. I have also been working on student organizations tasks, and would like to appoint two officers to help with things such as our website, and event coordination. It is also critical that wayside and propulsion meet with solar arrays this week in order to know the voltage and current that will be supplied to the bogies, right now that is a design critical specification that they have not been told.