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Abstract
A new numerical method is proposed for predicting the nonlinearity of tilting‐pad guide bearing oilfilm force in the rotor‐bearing system in a large hydro‐unit. Nonlinear displacement and velocity of the journal center, as well as nonlinear tilting angles and angular velocities of the pads in non‐stationary Reynolds equation are taken into account. This method is also suited for other small rotor‐bearing system. As an example, the response due to a momentarily created unbalance is Calculated. The nonlinear motion patterns of the pad and journal whirling orbit are obtained. Finally, the nonlinear orbit is compared to the linear one that could be calculated from linear stiffness and damping coefficients. It is shown that there are important differences between those two orbits and that the nonlinear simulation is more accurate.
Highlights
With increasing size and performance of hydro-unit for power generation plants, knowledge of their behavior becomes more and more important
The computer simulation process of nonlinear oil film force of tilting-pad guide bearing in large hydro-unit is presented in this paper
For the nonlinear film force theory is not perfect, in order to deal with the nonlinear film force of tilting guide bearing in actual engineering, the numerical simulation method is an effective way
Summary
With increasing size and performance of hydro-unit for power generation plants, knowledge of their behavior becomes more and more important. In the Three Gorges Project, each hydro-unit’s rated capacity reaches 700 MW, and its runner and guide bearing diameter are 10 and 3 m respectively. In order to determine design parameters (such as the number of guide bearings, radial clearance, supporting stiffness and journal’s size, etc.), to evaluate the external exciting forces and deliver control tactics, it is indispensable to analyze the rotor system dynamic behavior accurately during the unit’s design stage. The dynamic behavior of rotor system is very important. For the sake of safety of the hydro-unit running, the critical speed, natural
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