Determining the Resonant Frequency of a Mannequin

Omar Figueroa Fonseca, Gisela Gonzalez Contreras, and Dr. Muhammad Salman, Department of Mechanical Engineering, 1100 South Marietta Pkwy SE, Marietta, GA 30060

This paper will exhibit a mathematical approach to understanding how the human body will react when externally stimulated with repeated harmonic vibrations; most importantly is to foresee how the lumbar vertebrae responds to resonant frequencies. Human bodies are constantly exposed to external vibrations during regular activities. Although not always problematic, there are instances where frequencies can have negative effects; this can be seen when external frequencies become equivalent to human’s natural frequency which is referred to as resonance. The study focuses on observing resonance responses at seven different frequencies levels in both low and high spinal stiffnesses, depicting different human spinal behaviours. Proceeding with useful information to reduce and inhibit the amount of resonance experienced on the human body and improving the human body’s biomechanical efficiency. The method consists of reconstructing a model of the human spine in which the point of study will focus on the lumbar region while ignoring the surrounding regions. The spine stiffness will be adjusted by nylon cords running through the vertebrae and ribs. Aswell, to properly represent a human body, a skull will be connected with human-like joints in which will be covered with layers of silicone to constitute skin-like features. To properly understand how the external resonances affect the human body the mannequin will be placed on a vibrating base, thus allowing accelerometers to collect data for the range of frequencies. This will lead to finding resonances within the mannequin, allowing to find the stiffness of the desired region. To conclude, when comparing both soft and stiff spines the analytical data will presume that the displacement in amplitude should be higher for a stiffer spine. Therefore, understanding this finding will mitigate unwanted resonance between the human body and externally stimulated harmonic vibrations providing a more efficient environment.



Additional Abstract Information

Presenters: Omar Figueroa Fonseca, Gisela Gonzalez Contreras

Institution: Kennesaw State University

Type: Poster

Subject: Engineering

Status: Approved

Time and Location

Session: Poster 6
Date/Time: Tue 2:00pm-3:00pm
Session Number: 4588