3 Axis Center of Gravity Measurement Device

The goal of the project is create a device that measures the center of gravity of Schweitzer Engineering Laboratories' (SEL) products. The device must be able to automatically measure the center of gravity in all three dimensions.

=Problem Definition=

Background
SEL designs and manufactures many digital products that provide protection to electrical systems around the globe. One such product is their protective generator relay. During shipping, because the relays are exposed to shaking and/or vibration, they can potentially sustain damage. Because of this, SEL performs vibration tests on the relays to determine if any components will be damaged. Determining the center of gravity can help them improve the products sustainability against this damage.

Deliverables
 Proof of understanding of center of gravity measurement techniques Decision matrix of brainstormed solutions Proof of concept with at least a valid 1 axis measurement (Final prototype must be capable of measuring 3 axes) Functional prototype, made using a variety of materials and methods Validated measurements using an object with a known center of gravity Plan for final prototype packaging OR repackage of another prototype Record of total cost and steps for duplication Final report containing full information listed above with detailed validation analysis</li> </ul>

Specifications
<ul> Correctly measures each CG coordinate ±0.5% of that coordinate</li> Withstands a load of up to 50 lbs</li> Has a maximum size of 24" x 12" x 20"</li> Able to measure the CG of a product that is rack mounted</li> Operates while stationary</li> Stretch goal: Able to operate during a vibration test</li> </ul>

=Project Learning=

Four Load Transducers Method


Article: "Measuring a Centre of Gravity of an Object Using 4 Load Transducer Method"

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Two Moment Transducers and Flexure Pivot Method


Article: "Measuring Weight and All Three Axes of the Center of Gravity of a Rocket Motor Without Having to Re-Position the Motor"

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Measuring Table and Three Bipods Method


Article: "Mathematical Model Validation of a Center of Gravity Measuring Platform Using Experimental Tests and FEA"

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Automatic Rotation


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Cantilever Beam


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Rack Mounted


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Cantilever Beam with Box


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Prototype 1: "AT-AT"


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===Testing Prototype (Title In Progress)

Prototype 2: "Star Destroyer"


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Melted Sensor
=Design Considerations=

Cost Effectiveness
=Final Design=

=Validation=

=Team Members=

=Additional Documentation=

Project Schedule



Meeting Minutes



Presentations



Client Interview