110
E. Chircan et al.
Fig. 3 Eigen pulsations for a
beam with L = 0.55 … 0.1 m
(D variable and ω variable).
The first eigenvalue
Fig. 4 Eigen pulsations for
a beam with L = 0.55 … 1 m
(D variable and ω variable).
The fifth eigenvalue
it is determined whether the matrix is positively defined. If it is negatively defined
then the beam enters into a field of instability. In the paper, the stiffness matrix was
analyzed for different sets of beam length, diameter, and angular speeds with which
the beam is rotated in a centrifugal field. Figures 5, 6 and 7 show these results. The
areas in which we have instability are hatched in the figure.
4 Conclusions
Operation of a machine element that can be modeled as a beam, being in a centrifugal
field, can lead to instability phenomena, especially for the reason that the rotations
can be found frequently in technical applications. For this reason, it is the question
E. Chircan et al.
Fig. 3 Eigen pulsations for a
beam with L = 0.55 … 0.1 m
(D variable and ω variable).
The first eigenvalue
Fig. 4 Eigen pulsations for
a beam with L = 0.55 … 1 m
(D variable and ω variable).
The fifth eigenvalue
it is determined whether the matrix is positively defined. If it is negatively defined
then the beam enters into a field of instability. In the paper, the stiffness matrix was
analyzed for different sets of beam length, diameter, and angular speeds with which
the beam is rotated in a centrifugal field. Figures 5, 6 and 7 show these results. The
areas in which we have instability are hatched in the figure.
4 Conclusions
Operation of a machine element that can be modeled as a beam, being in a centrifugal
field, can lead to instability phenomena, especially for the reason that the rotations
can be found frequently in technical applications. For this reason, it is the question