Nonlinear dynamics analysis method for rotor-bearing system

Abstract

The invention provides a rotor-rotor. The nonlinear dynamics analysis method for the bearing system comprises the following steps: inputting calculation parameters; Calculating a system overall mass matrix, a rigidity matrix, a damping matrix and a gyroscopic effect matrix; Calculating unbalanced excitation of the rotor; Calculating the thickness of the bearing oil film at the t moment; And calculating the bearing oil film pressure at the t moment. Judging whether the oil film pressure meets a convergence condition or not; Calculating a bearing friction force and an end leakage flow at a t moment; Calculating the effective temperature and effective viscosity of the lubricating oil at the t moment; And calculating the oil film bearing capacity at the t moment. Newmark-based And algorithm: calculating the vibration response of the rotor system at the t + t moment. And whether the break + t moment reaches a time upper limit is determined. According to the method, the bearing nonlinear oilfilm force solving process based on the finite difference method is embedded into calculation of the rotor vibration response, and influence factors such as lubricating oil rheological properties andbearing bush surface elastic deformation are considered when the oil film force is solved, so that the response calculation is more accurate.

Description

technical field [0001] The invention relates to a nonlinear dynamic analysis method of a rotor-bearing system, which belongs to the technical field of rotating machinery. Background technique [0002] It is of great significance to study the motion characteristics and lubrication characteristics of the rotor-bearing system to guide the production design of rotating machinery. The key to the research is to obtain an accurate bearing nonlinear oil film force model. The traditional research method is analytical method, which adopts the nonlinear oil film force model of infinitely short or infinitely long bearing under the assumption of π oil film. Although the calculation speed of this method is fast, the scope of application is limited. For bearings with a length-to-diameter ratio L / D of about 1.0, this assumption will bring large errors. [0003] The research results of the nonlinear dynamic analysis method of the rotor-bearing system are abundant. The typical literature (...

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Problems solved by technology

Although these research methods have improved the accuracy compared with the previous models, they have ignored the influence of the rheological properties of the bearing lubricating oil and the elastic deformation of the bearing pad surface during the rotor operation, so there are still certain errors.

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