P17082: Elbow Model
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Build & Test Prep

Table of Contents

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Team Vision for Build & Test Prep Phase

The plan for this phase was to regroup after the break and evaluate overall project status, goals, and revisit any outstanding action items from the detailed design review and gate review. These action items mainly concerned updating documentation and continuing progress on a prototype.

These goals were meet, with the exception of a completed prototype and test plan data. This was due to unlikely difficulties with 3D printing that should not be a regular concern moving forward. All necessary documentation were updated, the idea of problem tracking was introduced, and the initial plans for a truss structure were used. Also, possible design competitions were investigated. Action Items for This Review

Test Plan Summary

Testing Plans

ER1 – Static Force of Muscle A – Attach load cell to break in muscle A string, hang 250g mass from hand hook, wait for arm to lower under the weight and settle, then get read out from Capstone. Validity- Force achieved at rest must match accepted anatomical value.

ER2 – Static Force of Muscle B – Attach load cell to break in muscle A string, hang 250g mass from hand hook, wait for arm to lower under the weight and settle, then get read out from capstone. Validity- Force achieved at rest must match accepted anatomical value.

ER3 – Static Force of Muscle C – Attach load cell to break in muscle A string, hang 250g mass from hand hook, wait for arm to lower under the weight and settle, then get read out from Capstone. Validity- Force achieved at rest must match accepted anatomical value.

ER4 – With each muscle attached and load cells strung, and the goniometer attached and reading out to Capstone, the arm is bent at the elbow and moved through the available range of motion. Validity- readout must show that the arm can move from approximately 0o and 90o.

ER5 – Hang a max load of 500g from the hand hook while holding the lower arm up to the upper arm so that the angle of the elbow is approximately 0¬o. release the lower arm and allow the weight and lower arm to fall. Validity- the arm must be able to fall and stop while still holding the weight, staying upright and stable (no concern of it being easily knocked over), and produce steady force and angel change graphs/tables through capstone. There should be no bending or material failure in a valid case, and the entire base must still be resting on the tabletop.

ER6- With load cells in place, no weights, and the lower arm resting so that the angle of the elbow is approximately 90o, measure the angles of the muscles with the bones and the distance of the muscle attachment to the bones. Validity – Both values must be within ±5%of the average adult.

ER7 & ER8- Set the model in each possible position with the 250g weight. For each position (supinated wrist, pronated wrist, flexed elbow), allow the position to be set and then allow the device to sit, with no contact with a person or extra support from an outside object (excluding tabletop), for 1 minute. Validity – The position set by the user must not deviate by more than ±1cm during the wait period.

ER9- With all loadcells attached to the muscles and the goniometer strapped to track the elbow, use Capstone software to record 30 seconds of data for each sensor by creating 4 graphical readouts of force (N) by time (s) for the loadcell sensor and angle (degrees) by time (s) for the goniometer, and then a table with a column of force readouts (N) or angle (degree) for each sensor and a column of time (s). Record the data results as a 250g weight is hung from the hook hand of the device and the elbow extends. Validity – each graph or table column can be produced, clearly shows the impact of the weight on the device, and can be saved and exported as a .txt, .m, or .xls file.

ER11- Measure the dimensions of the final model, upright, holding no weight and the elbow in such a way that the elbow is flexed and the lower arm does not extend past the base of the model. Strings may be loosened or untied to best minimize size of model. No loadcells or goniometer should be attached. Validity – The base of the device must be within 2ft by 2 ft.

Updated Bill of Materials

Updated Bill of Materials

Updated Bill of Materials

Risk and Problem Tracking

Risk Analysis

Risk Analysis

  1. The Running risk assessment can be found in this document_Updated Risk Assessment Document P17082

problem tracking template.

Design Review Materials

Build and Test Prep Power Point Presentation

Plans for next phase

Overview of Schedule

Updated Schedule

Updated Schedule

Summary of Plans

The main focus for the next review is to complete the current prototype for all test plans and come to a formal decision on both mold casting (Week 3) and the potential of completing 12 full models (Week 5).

The full schedule of plans can be found _here

The action items for the next phase are split into 2 plans, one based on the decision to cast & one based on the decision to not cast:

No Casting:

With Casting:

Shannon 3 Week Plan

Chris 3 Week Plan

Amanda 3 Week Plan

Maria 3 Week Plan


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