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10/01/22 - Setting some Parameters
10/01/22 - Setting some Parameters
I'd like to start by setting some goals for the first iterations:
I'd like to start by setting some goals for the first iterations:
Exit Velocity: Mach 1 = 343 m/s
Payload Mass: 0.3kg
Throwing Arm Radius: 0.5m
Vacuum Pressure: 10Pa
I'll set the iteration goals after I complete my initial scale model. For now, this will give me a good basis to design my mechanism off of.
I'll set the iteration goals after I complete my initial scale model. For now, this will give me a good basis to design my mechanism off of.
10/03/22 - Starting Some Math
10/03/22 - Starting Some Math
Using the parameter from before, I started with calculations to determine the force the arm would sustain and what motor would supply enough torque to get the projectile up to speed. Before this, I have bee watching many lectures on how to computational solve for characteristics and predict other properties of a projectile given impulse, mass, time , and distance.
Using the parameter from before, I started with calculations to determine the force the arm would sustain and what motor would supply enough torque to get the projectile up to speed. Before this, I have bee watching many lectures on how to computational solve for characteristics and predict other properties of a projectile given impulse, mass, time , and distance.
10/13/22 - Some Material Math
10/13/22 - Some Material Math
After finding the force applied on the arm, and using the density of carbon fiber, I was able to find the proper cross-sectional area of the arm to design with. I chose a round tube of carbon fiber 22mm in diameter, then took the density of the material to calculate the mass of the arm. Using this mass I found its centripetal force of the arm then added to the force of the payload to check if the pressure at the arm will not cause the arm to fail.
After finding the force applied on the arm, and using the density of carbon fiber, I was able to find the proper cross-sectional area of the arm to design with. I chose a round tube of carbon fiber 22mm in diameter, then took the density of the material to calculate the mass of the arm. Using this mass I found its centripetal force of the arm then added to the force of the payload to check if the pressure at the arm will not cause the arm to fail.
10/21/20 - Vacuum Calculations
10/21/20 - Vacuum Calculations
I want to optimize the design to use the vacuum that we already own. So, using the air flow and minumim pressure from the vacuum, we can calculate how large the container should be and how long it will take the chamber to get to the minum pressure.
I want to optimize the design to use the vacuum that we already own. So, using the air flow and minumim pressure from the vacuum, we can calculate how large the container should be and how long it will take the chamber to get to the minum pressure.
10/24/22 - Drag Resistance
10/24/22 - Drag Resistance
Using the minimum pressure the vacuum can pull, I calculated the drag force on the arm using a simple rode design. This force will change as the design changes, however, a rod design will help with overall rigidity in all directions rather than a streamline design in one.
Using the minimum pressure the vacuum can pull, I calculated the drag force on the arm using a simple rode design. This force will change as the design changes, however, a rod design will help with overall rigidity in all directions rather than a streamline design in one.
11/02/20 - All Calculations done
11/02/20 - All Calculations done
Now, I have all of my preliminary calculations done and have proved out the plausibility of a project like this. I plan on diving into CAD and sketches. But before I do, I wanted to take a fluid and forces course to further prove the reliability of my calculations.
Now, I have all of my preliminary calculations done and have proved out the plausibility of a project like this. I plan on diving into CAD and sketches. But before I do, I wanted to take a fluid and forces course to further prove the reliability of my calculations.
11/11/22 - Finished Simulation Course
11/11/22 - Finished Simulation Course
(FILE JPEG LIST)
11/12/20 - Reviewing Example Models
11/12/20 - Reviewing Example Models
After following along to these lectures, I'm ready to start sketches with new knowledge of how forces travel and fluid interacts with solids! Here are images of the models I used to experiment with Fluid Dynamics and FEA in Inventor.
After following along to these lectures, I'm ready to start sketches with new knowledge of how forces travel and fluid interacts with solids! Here are images of the models I used to experiment with Fluid Dynamics and FEA in Inventor.
Here's my plan of attack to design this:
Here's my plan of attack to design this:
- Research electronics that would be used to calculate velocity, acceleration, and altitude. Also find CPU to actuate some mechanical parachute deploy system.
- Start with purely mechanical sketches - body, nose cone , fins, etc.
- Move that design into CAD with proper material matching, mass calculations, and drag measurements.
- Iterate back and forth between sketches and CAD to find a good design that has low drag and is 0.3kg minus the mass of the electronics chosen.
11/18/22 - Starting with Payload Designs
11/18/22 - Starting with Payload Designs
As we want they payload to be about 0.3kg in mass, picking the correct material for this is crucial. I believe we will also pick some carbon fiber composite with a separation cone to deploy a parachute after a max altitude.
As we want they payload to be about 0.3kg in mass, picking the correct material for this is crucial. I believe we will also pick some carbon fiber composite with a separation cone to deploy a parachute after a max altitude.
11/21/20 - Finding Electronics
11/21/20 - Finding Electronics
After watching several videos from BPS.Space, the Signal R2 board seems like it has everything that I need. However, it is a bit overengineered for my use case (while also being quite expensive) . So instead of buying one of these, I thought I'd use some of the components that worked well on this board and build my own board that has only what I need.
After watching several videos from BPS.Space, the Signal R2 board seems like it has everything that I need. However, it is a bit overengineered for my use case (while also being quite expensive) . So instead of buying one of these, I thought I'd use some of the components that worked well on this board and build my own board that has only what I need.
Here's a list of the components I would need:
Here's a list of the components I would need:
- Power Switch
- Battery
- Main Processor
- Indicator LED (RGB)
- Place to store flight info (SD Card)
- IMU
- Barometer
- Antenna and wireless connection
11/21/20 - Finding Electronics
11/21/20 - Finding Electronics
After watching several videos from BPS.Space, the Signal R2 board seems like it has everything that I need. However, it is a bit overengineered for my use case (while also being quite expensive) . So instead of buying one of these, I thought I'd use some of the components that worked well on this board and build my own board that has only what I need.
After watching several videos from BPS.Space, the Signal R2 board seems like it has everything that I need. However, it is a bit overengineered for my use case (while also being quite expensive) . So instead of buying one of these, I thought I'd use some of the components that worked well on this board and build my own board that has only what I need.
Here's a list of the components I would need:
Here's a list of the components I would need:
- Power Switch
- Battery Input
- Main Processor
- Indicator LED (RGB)
- Place to store flight info (SD Card)
- IMU
- Barometer
- Antenna and wireless connection
12/04/22 - PCB Design
12/04/22 - PCB Design
I have been learning about PCB design for the past couple days. Ideally I would like this circuit board to fit in a 3" x 3" x 1" volume so It can fit well inside of the payload.
Next, I will be continuing on laying out the PCB and finishing construction on it so I can move on to the payload design. Starting with sketches.
12/10/22 - Mechanical Design
12/10/22 - Mechanical Design
Continuing the process of mechanical design, I will start with revieing images and sketches of the real spin launch and tweaking the scale of the project and designing and a place where I will clamp the holder onto the payload.
Continuing the process of mechanical design, I will start with revieing images and sketches of the real spin launch and tweaking the scale of the project and designing and a place where I will clamp the holder onto the payload.
Below, I have a few of my designs just getting the basic shape down. Not too much detail inside, but Im leaving that open until we get a good board design. I also will contuine to research way to clamp the rocket down.
Below, I have a few of my designs just getting the basic shape down. Not too much detail inside, but Im leaving that open until we get a good board design. I also will contuine to research way to clamp the rocket down.
12/20/22 - Clamp Designs
12/20/22 - Clamp Designs
Here I have a concept idea for a clamping mechanism. I'm thinking of using hooks on the slide of the rocket that slide into rails that are attached to the arm. Once the rocket is set in place the slot where the button lies, the electromagnet will close the release path.
Theoretically, while the circle is spinning up and at max velocity, there should be little force on the latching mechanism as there are only two resulting force vectors and the force should mainly be spread across the entire arm.
12/24/22 - Pivoting Goal
12/24/22 - Pivoting Goal
Truly I can't see myself finishing the original project goal by the deadline this year. So I plan on pivoting to learn as much about CAD while undergoing this project. Some of the things I plan I learning:
Truly I can't see myself finishing the original project goal by the deadline this year. So I plan on pivoting to learn as much about CAD while undergoing this project. Some of the things I plan I learning:
1) Advanced Lofting and Surfacing
2) Sketch to Design workflow
3) 3D CAM and built-in 3D Printing Support
I'm planning on using this project to learn as much CAD as I can. As I see it, I'm going to be interweaving tutorials when I see a model could use of the features listed. The arm could use some lofting as well as some 3D CAM.
I'm planning on using this project to learn as much CAD as I can. As I see it, I'm going to be interweaving tutorials when I see a model could use of the features listed. The arm could use some lofting as well as some 3D CAM.
1/15/22 - Camp CAD
1/15/22 - Camp CAD
Here, I starting modeling the basic shape of the release mechanism. The piston model is about an inch long for scale. The piston slots the red piece into the yellow block's slot, creating a strong holding force no directly held on the piston. This method can allow for a weaking piston by with the same force. I now plan to use FEA to estimate a clamping force on the block.
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