http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
evaluation of a three-dimensional static biomechanical model (3DHFEC) and biomechanical modeling of hip strength
Evaluation of a three-dimensional static biomechanical model three dimensional hand force exertion capability and biomechanical modeling of hip strength
xiv, 162 leaves : illustrations ; 28 cm.
A new static biomechanical model developed by Al-Eisawi (1997) was evaluated that predicts three-dimensional hand force exertion capability (3DHFEC) under strength, stability, and foot/floor friction constraints. Six male and six female participants performed five selected manual materials handling tasks: lifting, pushing, pulling, vertical wheel turning, and one-handed sideways push. With all the input data collected during each task, an optimization procedure was performed under the three classes of constraints such that the model predicted the maximum hand exertion capability and the value of a load sharing proportion at the right hip. First, the hand forces for each task predicted by the model were compared with those measured. Except for lifting, a relatively good correlation (r² > 0.55) was shown for the other four tasks. This implies that this model performs reasonably well with the tasks with asymmetric position of the lower extremities (pushing and pulling) and with the asymmetric exertion tasks (vertical wheel turning and one-handed sideways push). Second, the hip load sharing proportions ([]) at the right hip for each task predicted by the model were compared with the three load sharing proportions ([], [], and []) calculated based on the data from a pair of force plates during the same tasks mentioned above. For simple tasks such as lifting, pulling, and pushing, the results revealed that the averages of each load sharing proportions at the right hip were equal (p > 0.314) to the average predicted by the model. This implies that the hip load sharing scheme proposed by Kerk (1992) works only for those tasks. Two additional studies were conducted to measure the isometric hip strengths in non-sagittal plane exertions: abduction, adduction, internal rotation, and external rotation. First, prediction equations for mean and variance of each functional strength were derived for males and females, respectively. Second, the effects of hip flexion angle (110,̊ 145,̊ and 180)̊ on the isometric hip strengths in non-sagittal plane exertions were investigated. The results showed that only internal and external rotation strength for both genders were influenced significantly (p < 0.007) by the hip flexion angle.
"Major Subject: Industrial Engineering".
Issued also on microfiche from University Microfilm Inc.
Includes bibliographical references (leaves 145-148).