KAJI NUMERIK PENGARUH CACAT RETAK MELINTANG PADA POROS TERHADAP PERILAKU DINAMIK SISTEM POROS ROTOR
Abstrak
The stiffness of a cracked shaft changes due to the position of the crack. The problem is how to make a general equation of motion that can be used for all crack positions, so frequency response resulted represents the real frequency response of the cracked shaft. The cracked shaft modelling uses the moment inertia of cracked shaft at various crack positions is the first step. The second step is determining frequency response of significant crack position. The third step is determining the equivalent moment inertia of a cracked shaft that represents the condition of the crack. Next, by using Rayleight-Ritz Method and equivalent moment inertia of cracked shaft, the equation of motion that represents condition of cracked shaft can be determined. The results of this equation are Campbell Diagram and response to force excitation due to mass unbalance and asynchronous force. Dynamic behaviors of system are presented for three positions of crack, namely 0o, 90o, and average position. 0o position is the significant position, 90o position gives the smallest change to dynamic behavior of cracked shaft and the average position represents the condition of the cracked shaft.
Referensi
Dimaragonas, A.D., PAIPETIS, S.A, Analytical Methods in Rotor Dynamics, London:Applied Science, 1983.
Lalanne, M., Ferraris, G., Rotordynamics Prediction in Engineering, John Wiley and Sons, Chicester, 1990.
Jun, O.S., Eun, H.J., Earmme, Y.Y., Lee, C.-W., Modelling and Vibration Analysis of A Simple Rotor with A Breathing Crack, Journal of sound and Vibration 155(2), 1992.
Gasch, R., A Survey of the Dynamic Behaviour of A Simple Rotating Shaft with A transverse Crack, Journal of Sound and Vibration 160(2), 1993.
Popov,E.P., Mekanika Teknik (Mechanics of Material), Penerbit Erlangga, Jakarta, 1993.
Plaut, R.H., Andruet, R.H., Suherman, S., Behavior of Cracked Rotating Shaft During Passage Through A Critical Speed, Journal Sound Vibration 173(5), 1994.
Irvan, Hilmy, Analisis Dinamik Model Poros Rotor dengan Cacat Retak Transversal, Tugas Akhir Sarjana, ITB, Bandung, 1996.
Sekhar, A.S., Prabhu, B.S., Condition Monitoring of Cracked Rotor Trough Transient Response, PII:S0094-114X(97)0016-X, 1998.
Nugraha, K., Kaji Numerik Pengaruh Retak Melintang Pada Poros Terhadap Perilaku Dinamik Rotor Menggunakan Metode Elemen Hingga, Seminar Tugas Akhir, ITB, Bandung, 2001.