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Mechanical Device Design & Development

Jacob J. Setterbo | Ph.D. | Biomedical Engineering

This page displays some of the systems that I designed and fabricated for my project:

  1. Track-Testing Device (TTD) development

  2. Spring System development

  3. Compaction Device development

FIGURE_Picture 010_NOLetters.jpg Completed TTD Ram

1. Track-Testing Device (TTD) development

While developing the TTD, I gained experience in creating design alternatives and drafting these engineering designs using geometric dimensioning and tolerancing.  Once a design was complete, I fabricated the pieces in the machine shop myself using mills, lathes, and other common tools.  An accelerometer, custom load cell, and laser displacement sensor were ordered and incorporated into the design.  The pictures show the completed system, some machined pieces, and an example CAD drawing. 

NOTE: All parts sketched and machined by Jacob Setterbo.  CAD drawing prepared by Cris Flores.

 
IMG_0459 RAM pre-laser
 
IMG_0477.JPG Ram-LC Interface 1
 
IMG_0475.JPG Ram-LC Interface 2
 
IMG_0466.JPG dummy hoof
 
IMG_0467 Release system
 
LCHoof Interface.jpg CAD Drawing
 
IMG_0218 Horizontal Stop Lock pieces
 
IMG_0220 Horizontal Stop Lock
20081212wheatlab181.jpg Working on TTD

IMG_0440.JPG Spring System

2. Spring System development

A spring system was developed to impart an initial velocity to the TTD. To use the spring system, the laboratory hoist pulls up on the TTD top plate to compress the springs above, a quick-release latch initiates the drop, and elastomer bumpers act as shock absorbers as the spring plate is accelerated downward.  The hoist has a ton capacity (2000 lb) and can be adjusted vertically in increments of 3-4 mm (1/8 inch).  Theoretically, these increments will allow velocity increments of 0.02 m/s at the lower speeds and 0.12 m/s at the higher speeds.  The pictures show the completed system and some machined pieces.

 

 
IMG_0427 SP1, bottom
IMG_0430.JPG Spring Rods from bottom
 
IMG_0428 Spring Rods-lengthwise
 
IMG_0432.JPG Spring Bumper Adjustments
 
 
IMG_0425.JPG SP2 connected
 
IMG_0412 SP3's

 

FIG_compaction-contraption.jpg

3. Compaction Device development

While reconstructing surfaces in the laboratory, it became clear that a vibrating compaction plate was not sufficient to replicate the hardness of racetrack sub-layers. After preliminary experimentation with different compaction methods, this "compaction contraption" (see picture) was developed from 96 spikes which are normally used to isolate audio speakers from ground vibrations.

 

 

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