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Department of Mechanical and Aerospace Engineering
Sponsors: Michaelle Jinnette & Kevin Witt
Team Members: Brandon Char, Faith Edrosolano, Roman Schlichting, Fadi Shaba, Angelica Stuczynski
Background
Background
This project is sponsored by married UCSD alumni, Michaelle and Kevin, who have 4 children, one of whom is a 3 year old child named Tristan. Tristan has a mutation in the KCNH1 gene that causes an ultra-rare neurological disorder that results in a variety of symptoms and medical problems, such as facial and periodontal abnormalities, intellectual disability, and severe, intractable seizures, and, the focus of this project, sleep disturbance. Sleep plays a crucial role in development, having a direct impact on learning, mood, memory, and more. Currently, Tristan uses a motorized baby swing to help him sleep, but he has outgrown these swings, as they are designed to hold smaller children . The purpose of this project is to create a motorized rocking swing that can help Tristan sleep, as well as adapt with him as he grows older.
Final Design
Final Design
The final design of this project consists of a base structure, a gliding structure, a seating area, and a motor paired with a crank-rocker mechanism that rocks the gliding structure 17 degrees from vertical in each direction.
The base structure of the design consists of 4, 2x4 legs attached to long wood planks that is capable of holding the entire structure while resisting any sliding, rocking, and resonance movements that are produced from the swinging motion.
The gliding structure consists of two frames on either side of the structure and is connected through steel links with bolts, which allows the swinging movement in a circular arc. The 4 total steel links are designed to hold the entire weight of the seating structure and load (up to 60 lbs).
The seating area is a wooden pool chair design that is rigidly attached to the gliding structure. This area has an adjustable backrest that allows Tristan to rock in a variety of different lie angles as well as an adjustable footrest that can fold under the seating area to conserve space when the swing is not in use.
The motor and motor driver is housed in a compartment attached to the base of the structure and powers the rocking movement. The motor driver is a crank-rocker mechanism that is attached to a pole connected to the gliding structure. The crank-rocker driver converts continuous rotational motion into oscillatory motion, which allows the continuous AC motor to rock the gliding structure.
For more information, see our Executive Summary
Final Manufactured Structure
Final Manufactured Structure
Final Structure CAD
Final Structure CAD
Final Design: Annotated
Final Design: Annotated
Performance Results:
Durability and temperature testing:
Back EMF allows less current and therefore less voltage to be drawn upon to prevent overheating at 75% speed (~50 rpm) with max load
Swing Motion Design
Crank rocker (right) is implemented and secured with the initial angle and distance for consistent oscillation.
The motor mount, rod clamp, rocker arm, and crank were all manufactured in house
Motor chosen to power the crank
Our swing motion employs a four bar linkage setup. The motor will power a crank rocker setup to transform the angular motion to pushing the swing back and forth. The motor is high torque with low speed to provide a steady rocking motion for Tristan.
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