Science East harmonograph
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Date
2016
Authors
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Journal ISSN
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Publisher
University of New Brunswick
Abstract
A harmonograph is a device that uses swinging pendulum motion to draw complex geometric
patterns, known as Lissajous curves. This device is typically found in many science
exhibitions all over the world. We have been tasked by Science East to design and build a
two-pendulum harmonograph. The new device will replace their existing three pendulum
harmonograph which is prone to continuous failure due to defects in its structure. The new
design contains gimbals as pendulum pivots allowing the range of motion required and steel
for general construction to improve overall robustness. Calculations have been performed to
demonstrate that the selected pillow block bearings will not wear out during the device’s
lifetime; pivoting joints will not be at risk of failure due to stresses imparted, and that the table
will adequately support the device and other additional stresses caused by visitors to the
center. Construction and testing have proven the device works as intended meeting the client’s
requirements.