电磁振动料斗动态特性及其结构优化

发布时间：2018-05-14 17:03

本文选题：电磁振动料斗 + 动力学模型　；参考：《燕山大学》2011年硕士论文

【摘要】：电磁振动料斗广泛用于食品、机械、电子和医药等产品的自动化生产中。针对不同物料的材质、形状、表面特征和给料要求,其最佳振动料斗的各种结构性参数、定向机构和驱动力大小也不同,这种多性能指标和多影响参数的匹配问题一直是电磁振动料斗的研究难点与重点问题。因此,有必要使用理论计算的方法建立其动力学、运动学模型,并对振动料斗的结构进行优化设计和动态特性进一步研究。本文是在详细分析国内外电磁振动料斗发展现状的基础上,针对当前电磁振动料斗在结构优化上存在的主要问题,通过理论计算和有限元仿真模拟的方法,对偏置型振动料斗板弹簧的变形和符合运送物料的振型进行了比较系统的研究。对电磁振动料斗的工作原理进行系统地分析之后,建立圆盘式电磁振动料斗的动力学和运动学模型。通过对理论动力学模型的研究,计算了上下质体与其相对振幅的关系;根据幅频特性曲线分析了固有频率和激振力频率的关系,确定了振动料斗的工作状态。通过对振动料斗的理论运动学模型的研究,分析了偏置系数和不同轨道半径对振动角和板弹簧倾角之间关系的影响,以及分析了物料的滑行指数和抛掷指数,最后得到了振动角与其正(反)向滑行指数的关系和零件滑行运动状态与运动学参数的关系。本论文重点是用能量法计算板弹簧理论等效刚度,运用有限元方法对板弹簧理论垂直刚度进行模拟修正,从而得到修正后的板弹簧刚度公式;对板弹簧上具有惰性点的电磁振动料斗的理论固有频率进行了计算,并运用有限元方法对其结构的固有频率进行模态分析,通过对比修正得到修正后的固有频率公式。因此,为设计人员在设计阶段能计算出相对正确的固有频率奠定了基础。
[Abstract]:Electromagnetic vibration hoppers are widely used in the automatic production of products such as food , machinery , electronics and medicine . For the materials , shapes , surface characteristics and feeding requirements of different materials , various structural parameters , directional mechanism and driving force of the optimal vibrating hopper are different , and the matching problem of the multi - performance index and the multi - effect parameter is always the research difficulty and the key problem of the electromagnetic vibration hopper . Therefore , it is necessary to establish the dynamics and kinematic model of the vibration hopper by using the theoretical calculation method , and further study the structure of the vibration hopper .

Based on the detailed analysis of the current situation of the development of electromagnetic vibration hopper at home and abroad , the main problems existing in the optimization of the structure of the current electromagnetic vibration hopper are analyzed , and the deformation of the spring of the bias - type vibrating hopper plate and the vibration mode of the conveying material are compared with the method of theoretical calculation and finite element simulation .

After systematically analyzing the working principle of the electromagnetic vibration hopper , the dynamic and kinematic model of the disk type electromagnetic vibration hopper is established . Through the research on the theoretical dynamics model , the relation between the upper and lower masses and its relative amplitude is calculated . According to the amplitude - frequency characteristic curve , the influence of the bias coefficient and the radius of different tracks on the relation between the vibration angle and the inclination of the plate spring is analyzed , and the relation between the vibration angle and the forward ( reverse ) direction sliding index and the relation between the sliding motion state and the kinematic parameters of the parts are obtained .

In this paper , the equivalent stiffness of the plate spring theory is calculated by the energy method , and the vertical stiffness of the plate spring theory is modified by the finite element method . The theoretical natural frequency of the electromagnetic vibration hopper with inertia points on the plate spring is calculated , and the natural frequency formula after correction is obtained by means of the finite element method .

【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH237.1

【参考文献】