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Linear and Nonlinear Models of Human Hand-Arm Dynamics and Torque Tool Interaction

Ay, Haluk
http://rave.ohiolink.edu/etdc/view?acc_num=osu1315418040

Abstract Details

2011, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
The use of powered torque tools in manufacturing industries increases the productivity and accuracy of fastener tightening processes. However, prolonged exposure to the impulsive forces in torque tool operation likely poses risks of upper extremity injuries and musculoskeletal disorders. The human hand-arm response to such impulsive forces should be understood to reduce the risks associated with torque tools. This dissertation presents contributions to hand-arm modeling and parameter extraction methods for interaction with impulsive forces in torque tool operation. First, an improved parameter identification protocol is developed for an existing linear hand-arm model. The protocol is validated with human subjects’ testing for physical capacity assessment. The mean time-to-peak displacement and relative peak force errors based on the identified model parameters are 2.8 ms and 1.6%, respectively. Second, the validated protocol is used to determine the linear model parameters for in situ torque tool operation. A second step of human testing is conducted with commercially available direct current torque tools. The extracted model parameters provide 10.5 ms mean time-to-peak displacement and 6.8% mean relative peak force errors. Third, a novel device is developed that mechanically simulates the linear human hand-arm dynamics. The extracted in situ linear model parameters are utilized. The device is used to test commercially available right-angle tools for ergonomics-relevant evaluation. The peak force and displacement R2 between the device and human operator data are 0.98 and 0.85, respectively. Fourth, a mechanical system is developed that simulates the human hand-arm dynamics with conceptually similar nonlinearities. Experiments are carried out on the testing apparatus with the mechanical system attached. The range of peak displacement error for the tested torque amplitudes and durations are 0.8% to 1.9%. Similarly, peak force and time-to-peak displacement errors range from 2.3% to 10.5% and from 3.3 ms to 4.8 ms, respectively. The testing protocol is verified in terms of repeatability and nonlinear model parameter identification accuracy. Finally, a nonlinear model is developed to represent human hand-arm dynamics in torque tool operation. The model implements stiffness modulation and delay assumptions. A third step of human subjects’ testing is conducted. Various combinations of torque amplitude, duration, tool orientation, working posture and hand-arm resistance levels are tested. The nonlinear and linear model accuracy is compared to each other. The nonlinear model peak displacement and force errors range from -0.82% to 0.50% and from -0.22% to 2.38%, respectively. On the other hand, the linear model peak displacement and force errors range from 2.01% to 7.33% and from -7.44% to 19.92%, respectively. The ranges of time-to-peak displacement error for the nonlinear and linear model are from 0.49 ms to 1.26 ms and from -10.82 ms to 15.66 ms, respectively. The nonlinear model provides more accurate displacement and force estimation results than the linear model for all test conditions.
Anthony F. Luscher (Advisor)
Carolyn M. Sommerich (Advisor)
Necip Berme (Committee Member)
Manoj Srinivasan (Committee Member)
428 p.
Biomechanics; Mechanical Engineering; Occupational Health; Occupational Safety
human hand arm dynamics modeling; torque tool ergonomics

Recommended Citations

Citations

  • Ay, H. (2011). Linear and Nonlinear Models of Human Hand-Arm Dynamics and Torque Tool Interaction [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1315418040

    APA Style (7th edition)

  • Ay, Haluk. Linear and Nonlinear Models of Human Hand-Arm Dynamics and Torque Tool Interaction. 2011. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1315418040.

    MLA Style (8th edition)

  • Ay, Haluk. "Linear and Nonlinear Models of Human Hand-Arm Dynamics and Torque Tool Interaction." Doctoral dissertation, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1315418040

    Chicago Manual of Style (17th edition)

osu1315418040
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© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.