Direct Integration of Transient Rotor Dynamics.
Abstract
An implicit method was developed for integrating the equations of motion for a lumped-mass model of a rotor dynamics system. An an aside, a closed-form solution to the short-bearing theory was also developed for a damper with arbitrary motion. The major conclusions are that the method is numerically stable and that the computation time is proportional to the number of elements in the rotor dynamics model rather than to the cube of the number. This computer code, for thefirst time, allows the simulation of a complex rotor bearing system experiencing nonlinear transient motion and displays the vast amount of results in an easily understood motion-picture format - a 10-minute, 16-millimeter, color, sound motion-picture supplement. An example problem with 19 mass elements in the rotor dynamics model took 0.7 second of central processing unit time per time step on IBM 360-67 computer in a time-sharing mode. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- ADA080116
Entities
People
- Albert F. Kascak
Organizations
- National Aeronautics and Space Administration