| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 85 === Rotating machinery is used frequently in industry such as
turbomachinery,generator, motor, etc. Working speed of most
rotating machinery is usuallydesigned between the first critical
speed and the second critical speed.Thus, we hope that the rotor
can pass through critical speeds fast to reduce effects of
resonance. However, the inherent flaws or manufacturing defects
in the material will result in the crack, so a transient
dynamic and vibrationconditions of rotor-bearing system with
cracked shafts under a centrifugal fore is cased by disks of
this system is proposed in this paper.On the basis ofTimoshenko
beam theory, the transfer matrix method was used in this paper.
Beamsegments were combined with to deal with the frequency and
the correspondingmode shape of the cracked shaft.Lagrange''s
equation of motion is used todetermined equation of motion.By
means of the numerical method ( Newmark BetaMethod, Wilson
Theta Method and Houbolt Method,etc.) ,vibration conditions of
this system can be analyzed .
|
|---|
