Team Vision for System-Level Design Phase
Our Plan For This Phase
During the Systems-Level Design Phase, our goal as a team was to begin determining how to translate our customer & engineering requirements into practical design concepts. At the end of this phase, we hoped to have a solid baseline of tangible system ideas to build off of going into the Preliminary Detailed Design Phase.
What We Accomplished In This Phase
During this phase, our team was able to formulate a variety of different concepts in an attempt to satisfy the necessary functions we had previously defined for the product. The electrical side of our team conducted research on user feedback, inputs/outputs and possible switches/connectors to use, and also created flowcharts and block diagrams to conceptualize processes. The mechanical side of our team began to brainstorm methods to allocate more space for the electrical components of the car, as well as completed some initial modeling of the car's subsystems.
Use Case Scenario (Updated)
Feasibility: Prototyping, Analysis, Simulation
FeasibilityOur selected concept retains many of the elements from the original NXP car, while enhancing the areas identified in our customer and engineering requirements. The original car is proven in its ability to traverse the track but has shortcomings in the electrical and mechanical systems that make the iterative process of control system tuning and debugging inconvenient for users. We also aim to mitigate issues caused by unintentional overcurrent of the motor control board which caused PCB traces to vaporize.
- Hollow out chassis for weight savings
- Rear subframe to make assembly easier
- Dowel-like connection for screw mount
- Alternative to mounting battery with zip ties
- Inner tie rod ends hyme joint made of plastic make it out of metal?
- Tighter tolerance on mounting screw for inner tie rod
- Outer tie rod ball joint switch to hyme joint. Make Metal
- Upper control arm use screw instead of c-clip or snap rings
- Look into wheel “play” appears to be caused by wheel bearings in wheel assembly
- Lower joint only allows for side to side movement not up and down movement
- Good adjustable preload on spring based on spring mount location
- Make shim-able
- Add vibration prevention in base
Above shows a simplified concept of our ideal chassis with no rear suspension. This option would reduce weight and simplify the chassis assembly.
Above shows a simplified concept of our revision on the rear suspension. The Goal of this design is to create more space in the chassis for electrical components.
Above shows our camera mount design. This mount would allow for two axis adjustment of the camera.
Above shows our battery mount design. This would allow for a more secure battery.
Morphological Chart and Concept Selectionhere
Designs and Flowcharts
Link to Flow Chart here
Plans for next phaseFor the preliminary detailed design phase we will be deciding on the critical components for the drive system, control board and chassis, working on initial designs for board layout and chassis, and generating test plans to verify our designs against our requirements.
Safwan's 3 Week Plan:
- Selecting appropriate motor and perform calculations to meet customer and engineering requirements
- Initiate future test plans to overcome obstacles and selecting appropriate components
- Find alternatives for independent wheel speed sensors that fits within the budget
Fatma's 3 Week Plan:
- Estimate Board Dimensions
- Research switches for disconnecting battery power and selecting microcontroller power source
- Figure out necessary protection circuitry for control board
Cam's 3 Week Plan:
- Fully understanding purchasing process to streamline sourcing materials
- Establish deliverable's and timelines for next review
- Assisting mechanical team with detailed design
David's 3 Week Plan:
- Select H-bridge
- Select Motors
- Select Power Conditioning Circuitry
Jack's 3 Week Plan:
- Select connectors for high current connections
- Select user feedback and input devices
- Summarize trace widths required for different parts of the PCB
- Rough PCB layout based on footprints of selected devices
Brian's 3 Week Plan:
- Finalizing Chassis design
- Create BOM for Chassis
- Understand 3-D Print process for chassis parts.