Kaji Teoritik Kecepatan Kritis Pada Poros Dengan Metode Rayleigh dan Persamaan Dunkerley Serta Rancangan Awal Uji Eksperimental Kecepatan Kritis  

Oleh:

Kristono, Stephanus Nugroho ; Liong, A. Rugerri Toni

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI - atma jaya
Dalam koleksi: Metris: Jurnal Mesin, Elektro, Industri dan Sains vol. 5 no. 2 (Jun. 2004), page 74-81.
Topik: EQUATION; Dunkerley equation; Rayleigh method; critical speed
Fulltext: hal 74-81.pdf (175.56KB)

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM42.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

All rotating shafts deflect during rotation. The magnitude of the deflection depends on the stiffness of the shaft and its supports, the total mass of the shaft and its attached parts, and the amount of system damping. The critical speed of a rotating shaft, sometimes called the natural frequency, is the speed at which the rotating shaft becomes dynamically unstable and large vibrations are likely to develop. For any shaft there are an infinite number of critical speeds, but only the lowest (first) and occasionally the second are generally of interest to engineers. The others are usually so high as to be well out of the operating range of shaft speed. This primary research considers only the first critical speed of the shaft with two approximate methods of finding the first critical speed (or lowest natural frequency) of a systems are given, one attributed to Rayleigh method and the other to Dunkerley equation. The major difference between the Rayleigh method and Dunkerley equation is in the deflections. In the Rayleigh equation the deflection at a specific mass location takes into account the deflections due to all the masses acting on the system; in the Dunkerleyequation the deflection is due only to the individual mass being evaluated. In this paper shown, the Dunkerley equation underestimates (provides a lower bound on) the first critical speed and Rayleigh method overestimates the first critical speed.

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