Computer routine is similar to Holzer's method in torsional vibration treatment, and Prohl's and Myklestad's approach in computing rotor deflection. Matrix iteration technique is used to compute rotordynamic response by a simulated discrete mass system

Shen, F. A.

English

NASA Technical Reports Server

July 1971	 Brief 71-10211 
S NASA TECH BRIEF 
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be directed to the Technology Utilization Office, NASA, Code KT, Washington, D.C. 20546. 
Rotordynamic Response Analysis Program 
The problem: 
To determine the dynamic rotor displacements and 
bearing reactions of a real rotor, with mass eccentrici-
ties, as functions of rotor spin speeds. 
The solution: 
A computer routine similar to Holzer's method in 
torsional vibration treatment, and Prohl's and 
Myklestad's approach in computing rotor deflection. 
A matrix iteration technique is used to compute the 
•	 rotordynamic response by a simulated discrete mass 
system. 
How it's done: 
This program is applicable to the synchronous and 
axisymmetric motion of a rotor up to 99 mass stations 
supported by up to ten linear stiffness and damping 
characteristic bearings. The program takes the fol-
lowing factors into consideration: flexible rotor 
couplings in shear and in bending; shear and bending 
elasticity of the rotor; rotor mass, and the magnitudes 
and orientations of mass eccentricities; rotor polar and 
transverse moments of inertia; and rotor axial loading 
effects. 
The output of the program, in both printout and 
CRT, includes the absolute dynamic three-dimensional
rotor mode shapes, the dynamic journal displacement, 
the bearing reactions, and the maximum rotor deflec-
tion, journal displacements and bearing reactions 
versus speed functions. Auxiliary outputs also avail-
able are the computed local and total rotor weight, 
computed local and total rotor polar mass moments 
of inertia, and the location of the center of gravity of 
the rotor. 
Notes: 
1. This program is written in FORTRAN IV for use 
on the IBM-ASP/360 system. 
2. Inquiries may be directed to: 
COSMIC 
Barrow Hall 
University of Georgia 
Athens, Georgia 30601 
Reference: B71-10211 
Patent status: 
No patent action is contemplated by NASA. 
Source: F. A. Shen of

North American Rockwell- Rocketdyne

under contract to

NASA Headquarters
(HQN- 10579) 
Category 09 
This documefct was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States	 will be free from privately owned-rights.
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Rotordynamic response analysis program

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