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Viscoelasticity of Rubber Springs Affects Vibration Characteristics of a Flip-Flow Screen With the High G Value

机译:橡胶弹簧的粘弹性影响具有高G值的折叠流屏的振动特性

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摘要

With the high G value of vibration, outstanding sieving behaviors of a flip-flow screen are more likely to appear, but structural damages are aggravated under the high amplitude vibration. Considering rubber springs role on the vibration energy dissipation, viscoelasticity of rubber springs (i.e., shear springs and vibration isolation springs), is noticed to deal with the above contradiction. However, when rubber springs experience large amplitude vibration, viscoelastic responses influence more on the amount of damping than in the linear (i.e., small amplitude) vibration regime, as the frequency dependence of rubber springs is noteworthy. For this purpose, the Generalized Maxwell model is used to depict the frequency dependence of rubber springs and the practical damping is converted to a series damping parameters of the system, numerical models of the flip-flow screen under startup and shutdown modes and steady working conditions are proposed and verified firstly. Secondly, in order to explore kinetics responses of the elastic screen panel under different rubber springs damping coefficients, nonlinear finite element model of which is established. Finally, effects of rubber springs nonlinear damping on screen frames vibrations and screen panels nonlinear responses are studied. Results indicate that hysteretic damping of rubber springs can effectively solve the conflict between vibration strength and structural reliability of the flip-flow screen, since the low sensitivities of maximum stresses and the high sensitivities of accelerations to rubber springs damping are found.
机译:随着振动的高G值,更有可能出现折叠流动屏幕的出色行为,但在高幅度振动下会加剧结构损坏。考虑到橡胶弹簧对振动能量耗散的作用,橡胶弹簧的粘弹性(即剪切弹簧和振动隔离弹簧),被注意到以上矛盾处理。然而,当橡胶弹簧经历大的振幅振动时,粘弹性响应比在线性(即小幅度)振动方案中的阻尼量更多,因为橡胶弹簧的频率依赖性是值得注意的。为此目的,广义麦克斯韦模型用于描绘橡胶弹簧的频率依赖性,并且实际阻尼被转换为系统的串联阻尼参数,启动和关闭模式下的触发器屏幕的数值模型和稳定的工作条件提出并首先验证。其次,为了在不同橡胶弹簧阻尼系数下探索弹性屏幕面板的动力学响应,建立了非线性有限元模型。最后,研究了橡胶弹簧非线性阻尼在屏幕框架上的影响和屏幕板非线性响应。结果表明,橡胶弹簧的滞后阻尼可以有效地解决振动强度与倒档流动屏的结构可靠性之间的冲突,因为找到了最大应力的低灵敏度和加速度的高敏感性与橡胶弹簧阻尼的湿度。

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