Theoretical and experimental determination of dynamic friction coefficient for a cable-drum system

Cable-drum systems are utilized to convert the rotary motion of a drum into a translational motion of a linear stage connected to the cable. These systems are preferred where low backlash and high stiffness is expected. They are commonly employed in machines like elevators, photocopy machines, printers, plotters etc. For machines having long working ranges, cable-drum systems employing a high resolution encoder offers a practical low cost alternative in position sensing. In most traditional machines and equipments, to get linear position information; potentiometers, linear encoders, laser range finders etc. are commonly used. However, these alternatives are expensive and their installation is not straight forward. Cable-drum systems are not problem free either. The problem coming from using cable-drum system as a linear position sensor grows out of dynamic friction. In this study, the change in the dynamic friction coefficient of the cable drum system is modeled by using Euler and LuGre friction approaches. In order to see the change of the friction values, the developed model is simulated. To verify of the theoretical results, an experimental set-up is constructed. Both results are presented. It is concluded that for better positioning control change in dynamic friction coefficient during the motion should be accounted for.


Characterization of pea flour based nanofibers produced by electrospinning method
Oğuz, Seren; Şahin, Serpil; Şümnü, Servet Gülüm; Department of Food Engineering (2018)
Electrospinning is a process that produces continuous nanofibers through the action of an electric field imposed on a polymer solution. In this thesis, it was aimed to produce pea flour and hydroxypropyl methylcellulose (HPMC) based homogenous nanofibers by electrospinning. The effects of pH, pea flour and HPMC concentration, and microfluidization on apparent viscosity, electrical conductivity of solutions and nanofiber characteristics were studied. In addition, the effects of voltage and flow rate were ana...
Analysis and design of a novel reciprocating compressor utilizing a minfas-tar mechanism(s)
Ercan, Abdulkadir; Soylu, Reşit; Department of Aerospace Engineering (2021-1-26)
Similar to the slider crank mechanism that is utilized in a conventional reciprocating compressor, the MinFaS-TaR (Minimum Friction and Shaking – Translation to any Rotation) mechanism may also be used to convert a rotational motion into a translational motion. In the MinFaS-TaR mechanism, the translational and rotational motions can be related to each other in any desired manner. Furthermore, it has favourable dynamic properties. In this study, the piston motion function, , or the chamber pressure function...
Theoretical and experimental determination of capstan drive slip error
Baser, Ozgur; Konukseven, Erhan İlhan (2010-06-01)
Cable capstan drives are rotary transmission elements widely used in robot applications because of their low inertia, low backlash, high stiffness and simplicity. The cable in capstan drives is typically wrapped around the input and output drums in a figure-eight pattern and is the principle component for power transmission. In this paper an analytical method is developed for predicting the transmission error of capstan drives due to cable slippage on the drum so that designers can include this in the contr...
Computational study of flapping airfoil aerodynamics
Tuncer, İsmail Hakkı (American Institute of Aeronautics and Astronautics (AIAA), 2000-05-01)
Unsteady, viscous, low-speed flows over a NACA 0012 airfoil oscillated in plunge and/or pitch at various reduced frequency, amplitude, and phase shift are computed. Vortical wake formations, boundary-layer flows at the leading edge, the formation of leading-edge vortices and their downstream convection are presented in terms of unsteady particle traces. Flow separation characteristics and thrust-producing wake profiles are identified. Computed results compare well with water tunnel flow visualization and fo...
Investigation of subsynchronous resonance risk in the 380 kv Turkish electric network
Ozay, N.; Güven, Ali Nezih (null; 1988-12-01)
Subsynchronous resonance (SSR) occurs when a resonant frequency of a series compensated transmission system interacts with a natural frequency of the turbine prime mover. This form of SSR is referred to as torsional interaction which, under certain conditions, may become self-excited and cause serious damage to electrical equipment and turbine shafts. The presence of a thermal power plant (Kangal) in the close vicinity of a group of series capacitors in Eastern Turkey necessitated a careful investigation of...
Citation Formats
G. BAYAR, E. İ. Konukseven, and A. B. Koku, “Theoretical and experimental determination of dynamic friction coefficient for a cable-drum system,” 2010, vol. 5, Accessed: 00, 2020. [Online]. Available: