Master of Science, The Ohio State University, 2007, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Arts, The Ohio State University, 2007, Graduate School

Committee: Not Provided (Other) Subjects:

Master of Science (MS), Ohio University, 2021, Mechanical Engineering (Engineering and Technology)

This research project designs a portable eight-cable robot for large-scale outdoor agriculture usage; specifically, this project designs a portable pole for the cable robot which can transport the whole system between different fields. To simplify the design, the pole will be installed onto the existing automatic moveable base, which is assuming that the pole will be installed onto the Honda's automatic ATV. Then, the system verified its stability if it can be used in the field, which means the portable poles can hold some amount of the forces with a small deflection, no tipping, and no slipping. After comparing these design parameters with other design parameters, kinematic analysis, pseudo-statics analysis, beam deflection analysis, slipping and tipping analysis, model design, and the cost estimates are done based on what is most acceptable during the project.

Committee: Robert Williams II (Advisor); John Cotton (Committee Member); Yuqiu You (Committee Member); Morgan Vis-Chiasson (Committee Member) Subjects: Mechanical Engineering

Doctor of Philosophy, The Ohio State University, 1975, Graduate School

Committee: Not Provided (Other) Subjects: Economics

Master of Science (MS), Ohio University, 2015, Mechanical Engineering (Engineering and Technology)

Cable sag can have significant effects on the cable length computation in a cable robot and this is more pronounced in large scale cable robots, such as the Algae Harvesting Cable Robot System. This requires modeling the cable as a catenary instead of an approximated straight line model. Furthermore, when there is actuation redundancy involved, the modeling and simulation of the system becomes much more complex, requiring optimizing routines to solve the problem. The cable sag compensated or the catenary model was used for the Algae Harvesting Cable Robot System and simulated to solve the Kinematics and Statics problems. This involved optimization of cable tensions and finding the errors involved in the cable length. A relative comparative analysis between the straight line and cable sag model is presented. Finally based on the qualitative and quantitative results obtained, recommendations were made on the choice of model and solution methodologies.

Committee: Robert Williams II (Advisor); Hajrudin Pasic (Committee Member); Greg Kremer (Committee Member); Vardges Melkonian (Committee Member) Subjects: Applied Mathematics; Engineering; Mechanical Engineering; Robotics

PhD, University of Cincinnati, 2014, Engineering and Applied Science: Mechanical Engineering

Static structural stiffness is an important criterion in automobile structure design as it impacts vehicle handling, ride comfort, safety and durability. Traditionally, automobile manufacturers used special test rigs to estimate stiffness, which require precise setup and expensive instrumentation. In the past decade, dynamic frequency response function (FRF) measurements with modeling techniques were used to estimate static stiffness. Though test setup time and expense associated with the instrumentation are considerably reduced, heroic technical measures in terms of user experience and data processing are required to get reasonable stiffness estimates. The premise of this research is that static stiffness information contained in the measured free-free FRFs can be extracted by utilizing spatial/geometric filtering and averaging techniques. Two simple and efficient methods to estimate static stiffness from free-free FRFs are developed in this research. The enhanced Rotational and Bending Compliance Function (eRCF and eBCF) methods presented here utilize novel tools to enhance response functions and estimate static stiffness; such as mass perturbation during structural testing, spatial/geometric filtering and averaging techniques. The stiffness estimates obtained from these methods were comparable with the results from existing methods, while requiring significantly less resources. This dissertation presents the theoretical development of these methods and experimental validations on a rectangular plate (eRCF and eBCF) and an auto body (eRCF). Sensitivity studies on the effects of varying boundary conditions, dimensions and parameter estimation bandwidth on torsional and bending stiffness are presented. The effects of off-centered loading and overhang on stiffness are also discussed in detail. Finally, the conclusions and recommendations for future research are presented.

Committee: Randall Allemang Ph.D. (Committee Chair); David Brown Ph.D. (Committee Member); J. Kim Ph.D. (Committee Member); Allyn Phillips Ph.D. (Committee Member) Subjects: Mechanics

Master of Science (MS), Ohio University, 2000, Mechanical Engineering (Engineering)

Web-based instruction: statics on-line.

Committee: Bhavin Mehta (Advisor) Subjects: Engineering, Mechanical