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Systems Design

Table of Contents 1 Team Vision for Phase II 2 Benchmarking 3 Functional Decomposition 4 Transformation Diagram 5 Feasibility: Prototyping, Analysis, Simulation 6 Morphological Chart and Concept Selection 7 Systems Architecture 8 Designs 9 Risk Assessment 10 Design Review Materials 11 Plans for next phase

Team Vision for Phase II

The team planned and executed the following in this phase:

• disseminated the Martone down to the system level functions
• brainstormed multiple alternative solutions for each function
• developed initial feasibility for each concept
• outlined further feasibility analysis that will be required to make a design decision

Benchmarking

The excel document can be found here.

Learning Outcomes:

• Types of body woods use in guitars/ukelele may be applicable to the Martone
  • Alder, Maple, Mahogany, Poplar
• Body finishes used for guitars/ ukuleles desirable for the Martone
  • Gloss Polyurethane, Nitrocellulose lacquer, etc
• One PCB for all electronics like Artiphon for the Martone
• Re-design the PCB so that everything is on one board
• Guitars/ukuleles tuners possible solution for the Martone’s tuning system
• Artiphon/ Violin weights for the Martone
  • Light and easily portable

Functional Decomposition

Below is a top-down depiction of the anticipated operation of the Martone broken into various sub-functions. Each function describes how the function above it will be achieved as well as why the functions below it need to be achieved.

Transformation Diagram

The transformation diagram shows how the Martone functions convert the inputs into outputs in a logical sequence.

Feasibility: Prototyping, Analysis, Simulation

A detailed document reviewing the initial feasibility done in this phase can be found here.

Morphological Chart and Concept Selection

The morphological chart visually lists the brainstormed solutions to each function shown in the functional decomposition and transformation diagram. The Morphological Chart excel document can be found here.

Systems Architecture

Hardware Systems: Main Code:

Scanning Code:

Timing Diagram:

Designs

One of the main designs the team came up with this phase was to recess the layers of the touchscreen within the Martone body(frame). There are a few options within this design with regards to the clamp, pin, or adhesive method as well as potentially using a cover plate to help the polycarbonate protective layer look clean and simple.

More detail on the designs from this phase can be found in the Systems Design Review Presentation.

Risk Assessment

The Risk Assessment document can be found here.

Design Review Materials

The Systems Design Review Presentation can be found here.

Notes/Feedback/Action Items:

• Ken:
  • Might have to make the string tensioning system work for more than 4 strings (Ideal)
  • The concept selection needed some more work before revisiting
  • The timing diagram needed to show more interactions between the different parts
  • The microcontroller names should be changed to functional names
  • In the risk assessment, the failures need to be more specific inorder to show where the failures will happen, and to know what the mitigation should be
  • There is a person in the MSD team who will give more guidance on manufacturing and we should go to him early.
• Juan:
  • Outer polycarbonate layer is delicate
  • Might want to think about making it replacable
  • For charging option, ideal case to have both USB and wall charger
  • Vacuum forming might be an option in the manufacture of the body.
  • A debouncing algorithm is needed in the code.
  • We should not rely on CAD alone to check feasibility.
  • Right now, the touch sensor is thicker than the wood, so, we might lose space, or the martone might become wider.
  • The 3D electrodes have not been proven (we need to prove it)
  • The purchasing process might take time. We need to start thinking about it now.
• Matt:
  • The current wood that we are using is Poplar
  • Try laser cutting the wood before using bentwood lamination for the embedded portion

Plans for next phase

Our team will take the current initial feasibility and continue with a detailed feasibility analysis of each brainstormed concept that has pursuable potential. We will have put together our first draft of a bill of materials and an initial touchscreen test plan. We will be looking at specific components when the research has pointed us to a solution we all agree on (see non-highlighted rows on Pugh Chart). We want to have a first-pick for the microcontroller by end of next phase and begin analyzing the initial feasibility of the interplay of different system-level solutions.

A link to the team's 3-week plan document can be found here.

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