Team Vision for Subsystem-Level Design Phase
Our primary objective in this phase was to prototype and analyze our 3 subsystems which were the Control, Navigation, and Force Actuation. For each subsystem, we came up with different proof-of-concepts for different designs, which we then benchmarked and chose the best design to move forward with.
Control: H-bridge, Motor drivers, Solenoid drivers,
Navigation: Motors, Chassis, Wheels, Gearbox, BOM
Force Actuation: Solenoid valves, Flow loop design, Arm designs, Hand, BOM
Sub-Subsystem Design & Engineering Requirements
Feasibility: Prototyping, Analysis, Simulation
Control:
Micro-controller:
- considered PWM requirements
- MSP430
Peripherals:
Power Regulators:
Navigation:
Locomotion:
- motors
- CIM
- Pololu 100:1 gear motor
- wheels
- Pololu wheels
- gearbox
- frame (2ft x 2ft)
Force Actuation:
Arm:
- 2 arm designs considered
- 4 Channel Arm (4ChA)
- Slinky Arm (SA)
- preliminary prototyping of 4 Channel Arm (4ChA)
Finger:
- 1 finger design considered
- PneuNets Bending Actuator (PNBA)
- preliminary prototyping of PNBA has begun
- prototype part made
Pressure Distribution:
- Flow loop designed (schematic below)
Inputs and Source
- Engineering Requirements
- Concept Selection
- System Architecture
Outputs and Destination
- A list of Design Parameters, Quantified Targets, and acceptable tolerances
- Sensitivity analysis
- Concept Selection
Drawings, Schematics, Flow Charts, etc.
Air System Schematic
- A, B, C, D, E - one-way solenoid valves
- F - two-way solenoid valve
Valve Positioning:
- 1 (power on - valve closed)
- 0 (power off - valve open)
Valves | ||||||
---|---|---|---|---|---|---|
Task | A | B | C | D | E | F |
Tank Fill | 0 | 0 | 0 | 1 | 0 | 0 |
Arm Inflation | 0 | 1 | 0 | 0 | 1 | 0 |
Finger Inflation | 0 | 1 | 1 | 0 | 0 | 0 |
Finger Deflation | 1 | 0 | 1 | 1 | 0 | 1 |
Arm Deflation | 1 | 0 | 0 | 1 | 1 | 1 |
Pressure Release | 0 | 0 | 0 | 1 | 0 | 0 |
Bill of Materials (BOM)
Navigation:
QTY | Description | Supplier | Cost ($) |
---|---|---|---|
----- | ------------Structural------------ | ------------ | ---------- |
6 | 30” Aluminum C-Channel | Andymark | $18/ea |
8 | C-Base Aluminum Corner | Andymark | $4/ea |
42 | ¼” - 20 Hex Head Bolts | N/A | $14 |
----- | ------------Locomotion------------ | ------------ | ---------- |
2 | 2.5” CIM Motor | Andymark | $28/ea |
2 | Toughbox 14.88:1 Gear Box | Andymark | $75/ea |
4 | 4” Rubber Treaded Wheel | Andymark | $4/ea |
2 | ½” x 4” Free Axle | N/A | N/A |
2 | Direct Drive Collar | N/A | N/A |
2 | 3’ Drive Chain | N/A | N/A |
2 | Sprockets for Chain Drive | N/A | N/A |
Air System:
QTY | Description | Supplier | Cost per Part($) | Link |
---|---|---|---|---|
1 | Compressor | AndyMark | 69.00 | Link |
1 | Check Valve | McMaster | 17.03 | Link |
2 | Air Tank | AndyMark | 16.00 | Link |
8 | 1-Way Solenoid Valve | RIT | 0 | N/A |
1 | 2-way Soleniod Valve | RIT | 0 | N/A |
17 | Soleniod Valve Connector | RIT | 0 | N/A |
2 | Pressure Regulator | RIT | 0 | N/A |
2 | 2-Outlet Manifold | McMaster | 22.94 | Link |
6 | 1/4" NPT Compression Fitting | McMaster | 1.35 | Link |
4 | 1/8" NPT Compression Fitting | McMaster | 1.30 | Link |
25 ft. | 1/4" OD Polyethylene Tubing | McMaster | 0.10 per foot | Link |
25 ft. | 1/8" OD Polyethylene Tubing | McMaster | 0.05 per foot | Link |