ANALISIS PERILAKU DINAMIK SISTEM POROS-ROTOR 3D
Abstract: In the
system of rotating
shaft-rotor, vibration problems
often occur. Therefore,
in order vibration
spectrum analysis can be
performed with good
and safe operating
speed limits can
be determined properly,
then the information on
the natural frequency
and critical speed of shaft-rotor system
must be known well
too. Natural frequency of
the rotor-shaft system
depends on the
speed of rotation.
In this study
we analyzed the
dynamic behavior of a shaft-rotor system model by using 3D finite
element method and direct method. The analysis was performed to obtain the
critical rotation rates and visualizing mode shapes of the shaft-rotor system
model 3D. Here, shaft-rotor system model consists of a 3D multi-storey shaft
which is divided into 48 elements, two rivet shaft bearings, two disks, each of
which is divided into 12 elements. Shaft speed in RPM varied from 0 to 24000 RPM
with 100 RPM intervals. For each rotation axis arranged mass matrix, damping
matrix, and stiffness matrix systems
using the finite
element method. The
price of natural
frequency and mode
shape vector price
is determined by using the direct method. From the analysis that has
been done, the natural frequency obtained 96 forward and 96 backward natural
frequency. For 2 pieces of personal frequencies forward and 2 backward the first
natural frequency obtained 7 pieces of critical shaft rotation rates. From the
visualization mode shape for the first 4 rounds of the critical mode shape
obtained at the first natural frequency is equal to the forward mode shape at
the first natural frequency and the backward mode shape at the second natural
frequency is equal to the forward mode shape at the second natural frequency
backward. From the visualization mode shape for 3 rounds last critical mode
shape obtained in 2 pieces forward of the first natural frequency and mode
shape on the same 2 pieces of the first natural frequency equal backward.
Keywords: 3D rotor-shaft
system, the finite element method, direct method, natural frequency, mode shape
Penulis: Asmara Yanto dan
Rachmat Hidayat
Kode Jurnal: jptmesindd140213
