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URN etd-0915115-101903 Statistics This thesis had been viewed 1441 times. Download 447 times. Author Wan-Fu Huang Author's Email Address email@example.com Department Graduate Institute of Design Science Year 2014 Semester 2 Degree Ph.D. Type of Document Doctoral Dissertation Language zh-TW.Big5 Chinese Page Count 99 Title A Study on Human Knee Protection during Work Tasks - An Example of Carpert Layer Keyword Knee Kicker Bumper Design Work Knee Pads Work Knee Pads Bumper Design Knee Kicker Abstract Kneeling is a daily activity for some occupations like carpet layers, miners, tile layers, floor layers, electricians, shipbuilders and many others. Carpet layers comprise less than 0.06% of the United States workforce yet they submit 6.2% of compensation claims for traumatic knee inflammation. Cararpet layers have a high prevalence of occupational knee morbidity. Their work involves multiple sources of acute and chronic knee trauma including kneeling, pressure from sharp objects, and they need to frequently ‘kick’ the bumper on the rear end of the knee kicker with one knee when laying a carpet.
Considering the bumper’s marked effects on kicking force transmission and safety, the primary objective of this study is to improve the design of the knee-kicker bumper by reducing the risk factors. An improved pendulum-type impact-testing platform was designed as an evaluative apparatus, with the impulse and the coefficient of restitution serving as evaluative criteria.
The newly developed bumper has improved firmness from drilled blind holes and an increase in effective forward force of 15%-138%, which implies lower operational demands and a lighter knee burden (i.e., less kicking energy results in the same work efficiency), and a softer contact surface that enhances operating comfort. The newly designed kicker was positively reviewed by subjects.
The second part of this study, it is presented proposals for improved design work kneepad. The placement of the group of Flexible Force Sensor (FFSs) on the knee was found to be a major factor for the estimation of the force on the knees. It is apparent that proper kneepad design and selection can be an effective abatement to reduce the stress accumulated on the knee during kneeling work. The conclusion of this study is that novel knee pads designs that redistribute the stresses at the knee across a greater surface area and to other regions of the leg away from key structures of the knee are needed.
Advisor Committee Chih-Fu Wu - advisor
Che-Chung Wang - co-chair
Jun-Chieh Wu - co-chair
Yen Hsu - co-chair
Yen-Yu Kang - co-chair
Files Date of Defense 2015-07-29 Date of Submission 2015-09-15