P18045: Tremor Mitigation Test Arm
/public/

Systems Design

Table of Contents

All important System Level Design documents can be found here: D - Systems Level Design Documents

Team Vision for System-Level Design Phase

For this phase, the team planned to develop a preliminary design for the test rig by investigating different mechanisms/options for muscles, forearm size adjustment, data collection, skin material, and methods for mimicking the tremor.

Through the use of brainstorming, individually and as a team, morphological charts, Pugh charts, and some basic, preliminary feasibility analysis, the team did develop a preliminary design for the test rig, including specifics for each of the subsystems mentioned above.

Functional Decomposition

Below is our Functional decomposition, as you can see we have determined three main functional goals for this project.
Functional Decomposition

Functional Decomposition

A link to the powerpoint document can be found here: Functional Decomposition

Benchmarking

Currently, there are no products that perform the same function as ours. Instead we researched products/designs with similar sub-functions.
Benchmarking

Benchmarking

A link to the live document can be found here: Benchmarking Chart

Concept Development

The group used benchmarking, brainstorming, and feasibility in order to generate different concepts for each major subsystem of the test rig, then the morphological chart and Pugh charts helped narrow down the best combination of subsystems.

Feasibility: Prototyping, Analysis, Simulation

Motor Specs

Motor Specs

Torque_Calculation

Torque_Calculation

Torque Curve for a given stepper motor. Based the initial calculations of the motor requirements the motor we went with was able to provide the necessary torque at the given RPM. Making this motor a feasible purchase.
Torque Calculation

Torque Calculation

Muscle Wire

Muscle Wire

Muscle Wire Chart

Muscle Wire Chart

As you can see above one of the options that we considered for controlling the motion of the wrist was muscle wire. However while taking a look at the chart that discusses the operation of the wire. We realized that its not feasibly because of the high cool down time, and small pulling force. Which translates to a small torque!

Morphological Chart and Concept Selection

Below is our Morphological Chart with concepts for each of our system functions.
Morphological Chart

Morphological Chart

A link to our working Morphological Chart can be accessed here

Concept Selection

Concept 1

Concept 1

Concept 2

Concept 2

Concept 3

Concept 3

Concept 4

Concept 4

Concept 5

Concept 5

5 different concepts were developed from different combinations on the morphological chart.

10 selection criteria were determined and are listed in the Pugh Chart below. They cover the feasibility of the group to design and build it as well as the customer/engineering requirements. Then these concepts were compared against different datum in order to determine the best option.

Pugh Chart 1

Pugh Chart 1

Pugh Chart 2

Pugh Chart 2

The different parts of these concepts that made them stand out were combined with the feasibility analysis that was done in order to determine the best design concept for our team.

A link to the working document can be found here

Systems Architecture

Systems Architecture

Systems Architecture

Systems Architecture-Technical

Systems Architecture-Technical

Designs and Flowcharts

Electrical Sub-System

Electrical Sub-System

Microcontroller Sub-System

Microcontroller Sub-System

Risk Assessment

Risk Assessment

Risk Assessment

A link to the working document can be found here

Design Review Materials

Systems Level Design Review Presentation

Notes and Action Items to be updated after review.

Plans for next phase

Individual 3 Week Plans:


Home | Planning & Execution | Imagine RIT

Problem Definition | Systems Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Customer Handoff & Final Project Documentation