P19095: LiveAbility Lab
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Systems Design

Table of Contents

Team Vision for System-Level Design Phase

Our goal for this phase was to come up with a high level idea of how we are going to fulfill all of the customer and engineering requirements for our project. We planned to do this through brainstorming, research, benchmarking, and discussions to come up with the best solution to fit the customer's needs. The table below illustrates what we accomplished during this phase.

What? How?
Develop an understanding of all necessary functions that the device will need to perform. Solidified all customer and engineering requirements. Constructed a functional decomposition. Developed a systems architecture to determine how each subsystem will fit together.
Generate and discuss concepts for a system to perform all necessary functions. Created a morphological chart for functions identified in the functional decomposition. Brainstormed methods to achieve each function.
Compare and analyze options. Performed benchmarking analysis and Pugh charts for key functions to determine the best possible way to achieve them.
Analyze feasibility of design ideas. Performed feasibility analysis for key functions to ensure that all customer and engineering requirements will be met, and it will be possible to incorporate into the high level system design.

Some industry standards that we identified as relevant to this project are listed below:

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Functional Decomposition

Functional Decomposition

Functional Decomposition

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Concept Development and Morphological Chart

Morphological Chart for Set-Up

Morphological Chart for Set-Up

BMorphological Chart for Power

BMorphological Chart for Power

Morphological Chart for Data Collection

Morphological Chart for Data Collection

Morphological Chart for Data Communication

Morphological Chart for Data Communication

Morphological Chart for Data Analysis

Morphological Chart for Data Analysis

Morphological Chart for Packaging

Morphological Chart for Packaging

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Benchmarking

Battery Benchmarking

Benchmarking Analysis for the Battery

Benchmarking Analysis for the Battery

Force Sensor Benchmarking

Benchmarking Analysis for the Force Sensor

Benchmarking Analysis for the Force Sensor

Location Sensing Benchmarking

Benchmarking Analysis for the Location Sensor

Benchmarking Analysis for the Location Sensor

Microcontroller Benchmarking

Benchmarking Analysis for the Microcontroller

Benchmarking Analysis for the Microcontroller

Data Storage Benchmarking

Benchmarking Analysis for the Method of Data Storage

Benchmarking Analysis for the Method of Data Storage

Data Transfer Benchmarking

Benchmarking Analysis for the Method of Data Transfer

Benchmarking Analysis for the Method of Data Transfer

Feasibility: Prototyping, Analysis, Simulation

Force Sensor Feasibility

In order to confirm that the force sensor we choose will be able to measure the force of an individual's gait accurately, we need to make sure that the sensor can measure the individual's entire weight. For these calculations, we assumed that the sensor will need to measure up to 300 lbs, or 1334 N. The force ranges for each sensor are compiled in the table below.

Force Sensor Options Force Sensitivity/Range Max Force [N] Feasible? Y/N
Force Sensing Resistors 0.2 - 20 N 20 N
Load Cell - Button 25 - 1000 lbs 4448 Y
Load Cell - FlexiForce 0 - 4448 N 4448 Y
Array of Force Sensors - ThruMode Matrix 0.25 - 12.5 lb over 0.5 sq inch area 3531 [a] Y
3000E Pressure Mapping - Tekscan 125 - 862 kPa 17670 [b] Y

[a] assuming the average area of a size 10 shoe is 205 square cm, or 31.78 square inches, the total force that can be measured per unit area times the entire area of the shoe. This also assumes that the array of force sensors will take up the entire shoe, which doesn't need to be the case.

[b] assuming the average area of a size 10 shoe is 205 square cm, or 0.0205 square meters, the force can be found by multiplying the pressure and the area.

Based on this table, all sensors except the force sensing resistor will be able to measure at least 300 lbs of force. However, there are other factors such as cost, size, and safety that will be considered before officially deciding which sensor to use.

Financial Feasibility

Our total project budget is $2,000. Preliminary cost estimates for our top two configurations are in the range of $120-140. Given this information, the team is well on track to complete the project within the budget. Integration of the system and software licensing will be an additional cost we must consider. After this cost and the creation of two prototypes, the estimated cost of the project is around $1,000.

Data Transfer Feasibility

Data Transfer Feasibility

Data Transfer Feasibility

Current Draw Feasibility

Current Draw Feasibility

Current Draw Feasibility

Concept Selection

Pugh Chart for Overall Design

Pugh Chart for Overall Design

Systems Architecture

Systems Architecture Data Flow

Systems Architecture Data Flow

Systems Architecture Data Flow With Power

Systems Architecture Data Flow With Power

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Designs and Flowcharts

Preliminary Design Sketch

Preliminary Design Sketch

This link shows the F-Scan System by Tekscan, which is similar to the product we are trying to create.

This link shows the DWM1001 development boards working together to track location.

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Plans for next phase

Team Goal for Weeks 8-11

Finalizing the direction for each subsystem is the main goal of the next phase. Once each subsystem design is completed, then ideas and prototypes can be developed. This will give the team a clear path towards knowing which parts to purchase and include in each system and the entire system.
Gantt Chart

Gantt Chart

Individual Responsibilities to Achieve Team Goals

Martine Bosch
Nick Petreikis
Matthew Devic
Patrick Mylott
John LeBrun
Erik Brown
Hrishikesh Moholkar

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