Strength Analysis - Finite Element Analysis for Satellite Structures - page 131

0.04

0.035

0.03

0.025

0.02

0.015

0.01

0.005

0

10 100 1000 10000

Frequancy (Hz)

Liftoff, LV flight segment where M=1, qmax

Fig. 4.45 Random vibrations in the three mutually perpendicular directions during launch

4.5

4

3.5

3

2.5

2

1.5

1

0.5

0

10 100 1000 10000

Frequancy (Hz)
Liftoff, LV flight segment where M=1, qmax
1st stage burn (except for LV flight segment where
M=1,qmax), 2nd stage burn, 3rd stage burn

Fig. 4.46 Equivalent sinusoidal vibrations in the three mutually perpendicular directions during

launch

7. Set solution controls and solve the analysis: a harmonic analysis type is defined
during performing the analysis on ANSYS package. The default settings that
will work well for many structural harmonic analyses are selected. An indi-
vidual fully reversed harmonic analysis is performed for the entire satellite
model in each harmonic loading phase, and at every selected structural reso-
nance frequency. Then each superelement module is resolved to calculate the
fully reversed stress amplitudes in all DOF in the superelement for all analysis
sets. The harmonic analysis is performed by the full method which is the default
and the easiest one on ANSYS. It uses the full system matrices to calculate the
harmonic response (no matrix reduction). Solution listing format is chosen to be
real and imaginary parts. This option determines how the harmonic solution is