Last week (Week 3) the group focused on the brake pedal, and how to properly incorporate its physical properties into the overall design. Additionally, a CAD design was constructed to help simulate the actions the pedals would undergo.
This week (Week 4), the group expanded its focus in order to accomplish more. What was accomplished because of this is listed below.
One requirement for the pedal is that it is adjustable from the height of the 5th percentile female (5ft 2in) and 95th percentile male (6ft 2in)*. In order to make this adjustable, the group decided that a slide for the pedal box must be created. Thomas worked on constructing this, and photos of the design can be seen below.
The group decided that it would be best to place a hexagonal nut on the sides of the base of the pedal box. These would be placed in the large rectangular slots seen above. In addition, there is a hole for a pin in front of every one of these slots. The pin would be placed there and pushed through the pedal box base, so that the pedal box is secured during the drive. One problem that appeared in this was figuring out the 'linear pattern' feature in Solidworks. With the help of some of the senior members in Formula SAE, he managed to understand and use this feature, rather than manually editing each hole.
Additionally, a lot of work was done with the CAD model of the pedal box itself. The picture of this can be seen below.
David worked with the model and made it easier to modify the dimensions. This will make the CAD design easier to work with as the group continues working on the design in the future. The group will have to start developing the design of the pedal box to fit in the chassis soon, and in order to do this easy modifications to the dimensions will make the process go a lot smoother.
David also worked with Solidworks in figuring out the Finite Element Analysis (FEA). This analysis works with the model to measure were certain pressure is applied and how the group can best modify the design to resist any damage. This analysis is one of the most important steps in the design process, as the group want to do everything possible so the design is safest for the driver.
Both Lauren and David worked on developing the thickness of the throttle pedal. This is important to the overall design, as the throttle pedal must be thick enough to support the pressure of the driver's foot. Lauren and David also worked on finding the appropriate distance between the two pedals. There was an initial problem with this, as there was no suggested value for an appropriate distance. They managed to overcome this by looking at the design of the previous pedal box and measuring the average distance between the tips of a person's feet.
Finally, Drew worked with Solidworks to create a mount for the over travel switch. This switch will be placed behind the brake pedal, and will shut off the car system if the brake is pressed more than 90% of the way. The final design for the system will be ready next week.
Outside of Solidworks, the group has been quite busy as well.
David has worked with the 3D design of the pedal box, and created free body diagrams for the brake pedal. This will help the group in analyzing the forces which are applied to the pedal. From this, the group can learn how to properly change the design so that the pedal react to the applied force the best.
Along the same lines, David worked with Matlab scripts to test differing brake pedal geometries. These scripts are working to determine which geometry is best for the brake pedal, and how the pedal reacts to the forces which are applied to it (depending on the overall geometry).
Finally, Lauren started to create a Trello board, which is another tool to help organize the future plans of the group.
For the upcoming week (Week 5), the group will work to finish their analysis on the pedal box, so construction will begin the week after (Week 6). After some re-evaluation of the progress the group has made so far, a new weekly schedule was created, and can be seen below.
*According to FSAE rules (http://www.fsaeonline.com/content/2017-18-FSAE-Rules-091317.pdf)
Data found from NASA website (https://msis.jsc.nasa.gov/sections/section03.htm)
This week (Week 4), the group expanded its focus in order to accomplish more. What was accomplished because of this is listed below.
One requirement for the pedal is that it is adjustable from the height of the 5th percentile female (5ft 2in) and 95th percentile male (6ft 2in)*. In order to make this adjustable, the group decided that a slide for the pedal box must be created. Thomas worked on constructing this, and photos of the design can be seen below.
Additionally, a lot of work was done with the CAD model of the pedal box itself. The picture of this can be seen below.
David also worked with Solidworks in figuring out the Finite Element Analysis (FEA). This analysis works with the model to measure were certain pressure is applied and how the group can best modify the design to resist any damage. This analysis is one of the most important steps in the design process, as the group want to do everything possible so the design is safest for the driver.
Both Lauren and David worked on developing the thickness of the throttle pedal. This is important to the overall design, as the throttle pedal must be thick enough to support the pressure of the driver's foot. Lauren and David also worked on finding the appropriate distance between the two pedals. There was an initial problem with this, as there was no suggested value for an appropriate distance. They managed to overcome this by looking at the design of the previous pedal box and measuring the average distance between the tips of a person's feet.
Finally, Drew worked with Solidworks to create a mount for the over travel switch. This switch will be placed behind the brake pedal, and will shut off the car system if the brake is pressed more than 90% of the way. The final design for the system will be ready next week.
Outside of Solidworks, the group has been quite busy as well.
David has worked with the 3D design of the pedal box, and created free body diagrams for the brake pedal. This will help the group in analyzing the forces which are applied to the pedal. From this, the group can learn how to properly change the design so that the pedal react to the applied force the best.
Along the same lines, David worked with Matlab scripts to test differing brake pedal geometries. These scripts are working to determine which geometry is best for the brake pedal, and how the pedal reacts to the forces which are applied to it (depending on the overall geometry).
Finally, Lauren started to create a Trello board, which is another tool to help organize the future plans of the group.
For the upcoming week (Week 5), the group will work to finish their analysis on the pedal box, so construction will begin the week after (Week 6). After some re-evaluation of the progress the group has made so far, a new weekly schedule was created, and can be seen below.
*According to FSAE rules (http://www.fsaeonline.com/content/2017-18-FSAE-Rules-091317.pdf)
Data found from NASA website (https://msis.jsc.nasa.gov/sections/section03.htm)
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