三足离心机动态特性分析与平衡环抑振机理研究

发布时间：2018-04-15 17:52

本文选题：三足离心机 + 动态特性　；参考：《江南大学》2015年硕士论文

【摘要】：三足离心机常用来分离固、液的混合物,是医药、食品等行业中应用最为广泛的立式离心设备。三足离心机转速通常在2000转／分以下,属低速离心设备,这大大限制了离心效果与应用场合。长期以来,三足离心机的振动抑制问题一直是相关厂家面临的难题。而从国内外公开的文献中可以看出,对三足离心机动态特性及减振抑噪方法的研究还处于起步阶段。本课题以SS型300三足离心机为研究对象,对其悬挂系统进行了受力分析,推导出了其广义力的表达式,进而应用Lagrange方程建立了其动力学方程。对三足离心机进行了模态分析,发现其固有频率可分为明显的低频段和高频段,研究了各阶固有振型的特点,分析了摆杆长度对固有频率的影响。通过数值仿真,分析了系统的动态特性,并讨论了三足离心机主要减振部件的减振效果。在三足离心机振动模型的基础上,研究了三足离心机的倾覆现象。对稳态阶段三足离心机所受离心力进行了分析,推导了系统发生倾覆时的临界条件,并求解出相应倾覆转速。在此基础上,考虑了电机偏心的影响,对倾覆转速进行修正,并研究了偏心负载质量、偏心负载质心高度、工作系统质心高度等主要参数对系统倾覆转速的影响。分析了球体平衡环的工作原理,应用经典的双球模型分析球体平衡环的减振作用,建立了系统含有球体平衡环的动力学方程。研究了球体平衡环对三足离心机倾覆现象的影响,推导出了系统含有球体平衡环时的倾覆转速,研究了偏心负载质量、球体质量和球体平衡环高度对倾覆现象的影响。同时,分析了球体平衡环对三足离心机的减振作用,研究了球体质量和球体平衡环高度对其减振效果的影响。最后,通过三足离心机振动测试实验验证了球体平衡环的减振作用。
[Abstract]:Tripod centrifuge is often used to separate solid and liquid mixtures. It is the most widely used vertical centrifuge in medicine, food and other industries.The rotating speed of tripodal centrifuge is usually less than 2000 rpm, which is a low speed centrifuge, which greatly limits the centrifugal effect and application.For a long time, the vibration suppression of tripod centrifuge has been a difficult problem for related manufacturers.It can be seen from the published literature at home and abroad that the research on the dynamic characteristics of tripod centrifuge and the method of vibration and noise suppression is still in its infancy.In this paper, the SS 300 tripodal centrifuge is taken as the research object, the force of its suspension system is analyzed, the expression of its generalized force is deduced, and its dynamic equation is established by using Lagrange equation.The modal analysis of tripod centrifuge shows that its natural frequency can be divided into low frequency range and high frequency band. The characteristics of natural modes of each order are studied and the influence of the length of pendulum on natural frequency is analyzed.The dynamic characteristics of the system are analyzed by numerical simulation, and the damping effect of the main damping components of tripod centrifuge is discussed.Based on the vibration model of tripod centrifuge, the overturning phenomenon of tripod centrifuge is studied.In this paper, the centrifugal force of tripod centrifuge in steady state is analyzed, the critical condition when the system overturns is deduced, and the corresponding capsizing speed is solved.On this basis, considering the influence of motor eccentricity, the overturning speed is corrected, and the influence of the main parameters such as eccentric load mass, eccentric load centroid height and working system centroid height on the overturn speed is studied.In this paper, the working principle of the spherical equilibrium ring is analyzed, and the classical double sphere model is used to analyze the damping effect of the spherical equilibrium ring, and the dynamic equation of the system containing the spherical equilibrium ring is established.The effect of the spherical balance ring on the overturning phenomenon of tripod centrifuge is studied. The overturning speed of the system with the spherical balance ring is deduced, and the effects of eccentric load mass, spherical mass and the height of the spherical balance ring on the overturn phenomenon are studied.At the same time, the effect of spherical balance ring on the vibration absorption of tripod centrifuge is analyzed, and the influence of ball mass and the height of spherical equilibrium ring on the damping effect is studied.Finally, the vibration absorption of the spherical balance ring is verified by the vibration test of tripod centrifuge.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.84

【参考文献】