P18044: Tremor Mitigation Device 2
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Integrated System Build & Test

Table of Contents

Team Vision for Integrated System Build & Test Phase

Summarize: What did your team plan to do during this phase?

What did your team actually accomplish during this phase?

Pictures of Assembly and Components

 Final Assembly

Final Assembly

Final Assembly Video

Final Assembly Pictures

Sketches

Test Results Summary

Analysis of Varied Control Logic Parameters

Purpose and Plan

Raw data from 9DOF sensor (gyroscope) was collected using drill powered test rig, operating at approximately 6.5 Hz. 4 data types were collected, brakes off, and brakes on with braking threshold set at 50 degrees/second, 75 degrees/second, and 100 degrees/second. Data was collected in triplicate.

Gyroscope data from tremoring axis (X) was converted into displacement using numeric integration and converted from rotational to linear displacement in MATLAB. The height peaks were determined using built in functionality with manual adjustment of threshold values. The script for analysis is included in the appendix.

Our engineering requirements state that in order for the system to be behaving within an acceptable level, the displacement with brakes on should be less than or equal to 75 % of the displacement with brakes off (stretch goal, 50% reduction). We already know that with the threshold set at 75 degrees/second our engineering requirement and stretch goals are met.

The goal of this further analysis is to determine the optimal braking threshold and to better understand how varying this parameter will affect our results quantitatively. It is predicted that a lower threshold will more effectively reduce tremor amplitude, but it may cause restrictions in ease of natural movement.

Results

 Varied Brake Parameter Testing and Analysis

Varied Brake Parameter Testing and Analysis

Conclusion

Based on our testing, all testing thresholds yield acceptable results. A final decision for braking threshold should not be made until further testing (multi axis, ease on natural motion) is completed and analyzed.

Control Logic: Multi-axis State Map

Analysis of Control Parameters

Risk and Problem Tracking

Risk Assessment

 Risks

Risks

Risk Assessment

Problem Tracking

 Problem Tracking

Problem Tracking

Problem Tracking

Vision for Imagine RIT

Our senior design project a wearable assistive medical device intended to mitigate Essential Tremor. Essential Tremor is a neuropathy that causes involuntary rhythmic muscle contraction which afflicts roughly 7 million Americans. A tremor typically manifests in the arm of the patient, and can progress up the arm and to the neck and voice box as the condition progresses. There are drug treatments that require constant monitoring, dosage adjustments, and can cause some unpleasant side effects. Curative deep brain stimulation procedures are also available, but the procedure is very invasive. Our device provides an alternative inexpensive, noninvasive option. The tremor is sensed with a 9 degree of freedom sensor on the hand. Restrictive braking forces are produced by bearing mounted electromagnetic brakes, which is controlled by a microcontroller operating with active feedback logic. Our team worked on the second iteration of this project. This year, we worked to make the design more robust and complete to improve its mitigation functionality. We are working in parallel with a tremor data acquisition device team, and a device test rig team.

 Imagine RIT Rig Sketch

Imagine RIT Rig Sketch

Imagine RIT Proposal

Plans for next phase

By the end of the next phase we plan to have the following completed:

Vision and Planning Documents

 Draft of Project Plan

Draft of Project Plan

Project Plan for Next Phase

Individual Three Week Plans


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