| The non-sinusoidal oscillation technology of continuous casting mold is one of thekey technologies in the development of high-efficiency continuous casting. The full-leafspring non-sinusoidal oscillation system driven by servo motor, which run smoothly andthe waveform is adjusted flexibly, comparing with the traditional four-link sinusoidaloscillation system. However, Production practice shows that the equipment’s impact ofnon-sinusoidal oscillation system is more serious than the sinusoidal system. Therefore,the analysis and research of the system dynamic performance has important theoreticaland practical significance. For the full-leaf spring-type non-sinusoidal oscillation systemdriven by servo motor, series of research works has been carried out in this paper.The operating principle and structural design of the oscillation device are stated indetail. The assembly model of oscillation device is built by a bottom-up modeling method.The realization of non-sinusoidal waveform of the oscillation device driven by servomotor is analyzed combining DEMAG non-sinusoidal waveforms.Based on the dynamics simulation software ADAMS, the rigid-flexible couplingdynamic simulation model is established, and the dynamics and kinematics characters aresimulated. At first, the impulse force of the spring is optimized, then the rules how the leafspring force and the hinged force are researched as the oscillation parameters change.Finally, the collision contact force between meshed gears has been defined according tothe Hertz theory, the impact of the tooth how to affect the oscillation system through theengagement force of the time domain and frequency domain characteristics is obtained bysimulation.Considering the time-varying mesh stiffness in transmission system during themeshing process, the elastic dynamic model and differential equation of the full-leafspring-type non-sinusoidal oscillation system driven by servo motor are set up byspring-mass lumped parametric method in this paper. and the internal characteristics of thesystem are analyzed. Variable step size fourth-order Rounge-Kutta method is adopted tosolve the systemic elastic deformation response, and the rules of the mold dynamic response are researched as the oscillation parameters change in time domain aspect.Finally, The elastic response of the system is decomposed by making use of wavelettransform multi-resolution features, and then the power spectral density analysis of thelow-frequency signals in time-varying meshing stiffness is done, so the impact of the toothmeshing stiffness of the transmission system to the oscillation system is found. |
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