A simple torsional system has two torsional springs with stiffness K = 100.0 lb-in/rad and two mass elements with rotary inertia of 1.0 lb-in-sec2. Determine the lowest two natural frequencies and mode shapes of the system.
The system is modeled using 2-node torsional spring elements and mass elements. Joint 1 is fixed and all degrees of freedom except rotation about the Global X are restrained at joints 2 and 3.
Tested Features
Sources
- W.T. Thomson, "Theory of Vibration with Applications", Prentice-Hall Inc., Englewood Cliffs, NJ, 2nd Edition (1981).
- EMRC, "NISA II Verification Problems Manual", 1991.
- LARSA 4D