Doctoral Dissertations
Abstract
"Operator performing fastening operation with powered hand-tools at awkward postures is subjected to external forces that may pose a risk of developing ergonomic injuries. For design of safe workplaces and selection of tools it is necessary to identify the probable causes of discomfort by simulating the work conditions and quantifying the risk factors. An ergonomic simulator is developed to simulate the fastening operation and quantify the effects of posture and force in fastening operation. The effect of dynamic forces is analyzed using two approaches. The first approach analyzes the effect of tool vibration while the second analyzes the hand-arm system response to the tool torque by modeling the hand-arm system as a single-degree-of-freedom dynamic system. The hand-arm system model is used to predict the hand-arm displacement and dynamic reaction force. Equivalent static load is calculated to combine the static and dynamic forces in fastening operation. Ergonomic analysis of individual risk factors is conducted and preventive actions are suggested.
Tool vibrations were analyzed using the IS0-5349 Standard and quantified as years taken to 10% probability of finger blanching. Strong agreements were observed between the predicted response from the identified hand-arm system model and the measured response with average correlation coefficients of 0.95. Results of the study indicate that the pistol-grip tool had higher vibration and generated higher reaction force than the right-angled tool for all subjects. The reaction force increased with increase in grip force for both tools at all postures. The RULA score utilizing the equivalent static load effectively analyzes load and posture for comparing workplace risk factors"--Abstract, page iv.
Advisor(s)
Leu, M. C. (Ming-Chuan)
Murray, Susan L.
Committee Member(s)
Eversman, Walter
Landers, Robert G.
Chandrashekhara, K.
Department(s)
Mechanical and Aerospace Engineering
Degree Name
Ph. D. in Mechanical and Aerospace Engineering
Sponsor(s)
- Missouri University of Science and Technology. Center for Aerospace Manufacturing Technologies
- Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
- Boeing Company
- Siemens
Publisher
Missouri University of Science and Technology
Publication Date
2011
Journal article titles appearing in thesis/dissertation
- Ergonomic analysis of fastening vibration based on ISO standard
- Fastening ergonomics study based on state-space modeling of hand-arm system
- Muscular fatigue and force sustenance at different operator postures
- Ergonomic simulator to study impact of external forces and posture on operator safety in fastening
Pagination
xii, 105 pages
Note about bibliography
Includes bibliographical references.
Rights
© 2011 Akul Shantaram Joshi, All rights reserved.
Document Type
Dissertation - Open Access
File Type
text
Language
English
Subject Headings
Vibration -- Physiological effect -- Computer simulationVibration -- Measurement -- Computer simulationHuman engineering -- Computer simulationRobotics -- Human factorsState-space methods
Thesis Number
T 10183
Print OCLC #
870999712
Electronic OCLC #
908695840
Recommended Citation
Joshi, Akul, "Dynamic ergonomic analysis and simulation of fastening operation" (2011). Doctoral Dissertations. 24.
https://scholarsmine.mst.edu/doctoral_dissertations/24