Computer Model for Dynamic Skyline Behaviour


  • K. C. Womack Oregon State University, Corvallis, USA
  • M. R. Pyles Oregon State University, Corvallis, USA
  • H. I. Laursen Oregon State University, Corvallis, USA


The development and experimental verification of a numerical model for the dynamic behavior of a cable logging system skyline is discussed. The model is intended to simulate the skyline behavior after a turn of logs breaks out of a "hang-up" on the ground. Output from the model may be used as a forcing function for a dynamic load on the tailspar or other component of the cable logging system. The numerical model uses finite difference and Runge-Kutta techniques. Output from the model consists of time-histories of the fluctuations in skyline tensions. From this output the frequencies of the skyline vibrations may be determined. The model was verified by experimental data collected while operating a small cable logging system in Oregon State University's McDonald Research Forest.






Technical Papers