Study on the vibration characteristics of a roller-supporting horizontal centrifugal casting machine

Abstract

It is necessary to do some research on the vibration characteristics of a horizontal centrifugal casting machine for producing furnace tubes since it has significant influence on the final quality of the products. In this paper, vibration characteristics of a roller-supporting horizontal centrifugal casting machine are analysed with transfer matrix method, including critical speeds and unbalance response. The results show that the distribution of the eccentric masses has significant influence on unbalance response. The model established and the results obtained in this paper will be useful for furnace tubes quality improvement.

Numerical investigation on the rotordynamics of a high-speed air compressor supported by gas foil bearings

“…Lumped models are commonly applied in published researches on rotordynamics (e.g. Li et al 25 ) and show high reliability, justifying the approach in this paper.…”

“…As shown in Figure 5, the unbalance on the ith disc is determined by its amount Q i and direction angle h i . 25 According to Standard ISO 1940-1:2003, Q can be calculated by…”

“…As shown in Figure 5, the unbalance on the ith disc is determined by its amount Q i and direction angle η i . 25 According to Standard ISO 1940-1:2003, Q can be calculated by Q = GM 10 3 ω , where G is the unbalance grade and M is the rotor mass. Considering the centrifugal force on the disc, equation (32) can be rewritten as:…”