Analysis On Modal And Chaos In Complex Rotor System

Rotating Machinery is the important power machinery in modern industry. It has broad application in industry such as machinery, electric power, traffic, aviation, chemical industry, and the sources of energy, mining industry, and war industry. With the development of science and technology and modernized industry, Rotating machinery is developing to direction of high-speed-lization, light-lization, centralizes to large-scale-lization, melting in a row, the automation draws high-power, big load, and the resulting Non-linear vibration problems have become increasingly prominent. Once these equipment malfunctions because of nonlinearity bump against rub, economic losses is enormous. At present, scholarships pair rotation subsystem dynamics characteristic property has carried out large amount of research, has got gratifying research result. But many of the conclusions which are based on a simple mechanical model are some limitations. it is not denied that rotor system dynamics model is the precondition of the rotor system dynamics research.A rotor system mechanical model in line with principle of truth, completeness, and reasonable, progressiveness, practical and terseness, an innovative dynamic model is established. At first, the rotor system model construction is reasonable while a variety of factors is considered. Casing (basis) has certain flexibility per se originally, some Rotating Machinery such as aero motor’s casing have bigger flexibility, because of difficulties in study, people often regard the casing as no deformable rigid body, such treatment is bound to bring about bigger error to the result calculating analysis. Exactly be casing has certain flexibility per se, the vibration of the rotator and machine affect mutually, which requires regarding the rotator and casing as the unified entirety, and study it’s dynamics characteristic property. Second, thinking to some mechanical actual peculiar rotating structure forms, we shouldn’t ignore the casing self elasticity, the effect that the elastic linkup pair rotation subsystem between the casing and the stator responds to, and should not ignore the effect when the disk non-symmetrical arrangement of the gyroscopic torque produced. At last, thinking that rotation shaft elasticity, axle bearing elastic foundation, elastic foundation, the linkup elasticity and top force moment cantilever pair of asymmetric set20liberty degree rotators system among the stator and the base, which we call Non-linear complex elastic rotator system. At present, research on the elastic characteristics of the rotor system dynamics is not abundant and research on the Non-linear complex rotor is less. Therefore, the dissertation is based on Bench-kind, nonlinear dynamic characteristics problems of the Non-linear complex rotor system are researched.Vibration modes of Non-linear complex rotor system is analyzed and the effect of the temperature diversification on vibration modes of the rotor system is researched, what provide an important basis data for further research the dynamic characteristics of the rotor system. Using computer simulation technology, the finite element model of the rotor system by using ANSYS is established and the vibration modes of the rotor system are analyzed. What is founded that different temperatures have different effects on the natural frequency of the rotor system and the natural frequency will lower with elevation of temperature. The higher the temperature is, the more intensely the natural frequency declines. The analytical results provide a basis data for thoroughly researching the dynamic characteristics of the rotor system. Using numerical analysis method, bifurcation and chaotic behavior of the rotor system is researched what is favorable for leap that people research dynamic characteristic of rotor system from macroscopical theory to microcosmic practice and prepare the basis for further researching rotor system dynamics is prepared. Using numerical analysis method, system vibration differential equation is established, combining with the bifurcation diagram, waveform, phase plane and the axis trajectories of the rotor system and bifurcation and Chaos Behavior of elastic rotor system is researched. It is founded that system response experience several times from chaotic to periodic solution, then to chaos and then to periodic solution what is chaotic and periodic solution alternation process. The way to chaos is Period Doubling Bifurcation into chaos and Paroxysmal Bifurcation into chaos. A theoretical basis for rotary machines rotor system Parameter Design is provided by the analysis results.