三自由度混沌振动筛的设计与研究

发布时间：2018-01-03 13:35

本文关键词：三自由度混沌振动筛的设计与研究　出处：《安徽理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：筛分机械在生产生活的各个领域都有着广泛的运用,传统筛分机械的已经不能满足人们日益增长的需求。传统筛分机械筛分效率较低,筛分时筛孔易于被堵塞等缺点在现代社会工业生产加工中已经愈发明显。混沌理论是上世纪中页被提出的一种新学说,在前人的努力下已经证实混沌振动在物料筛分上相对于传统机械有着更大的优势,更好的筛分效率,更大的物料处理量,与更强的透筛率。结合并联机构刚度、精度较高的特点、可以构建复杂运动曲线等特点,本文提出了综合并联机构与混沌振动理论的一种新型三自由度混沌振动筛。通过ADAMS运动学虚拟样机仿真软件对其运动特性进行仿真,再利用ADAMS、MATLAB、ANSYS软件对其动力学特性以及具体结构进行分析,基于TRIZ理论对其振动筛结构进行优化。具体工作如下所述:第一步:对三自由度混沌振动筛按要求进行具体设计,创建三维模型,数学与动力学模型,利用拓扑机构学知识对振动筛进行机型分析,得到其DOF(自由度)为三平移,在对其建立运动学模型并且进行分析。第二步:为使计算机模拟仿真时的计算量减小,对三自由度混沌振动筛的三维模型进行简化,其后通过ADAMS对简化模型进行仿真,得到各方向受激励输出的响应数据。第三步:利用MATLAB与ADAMS的后处理模块对仿真得出的数据进行混沌识别,确定振动系统在工作时已经进入混沌状态。第四步:基于TRIZ理论对初始设计的三自由度混沌振动筛振幅调整困难进行了优化,增强振动筛的适用性。第五步:使用ANSYS有限元分析软件对三自由度混沌振动筛筛架进行六阶模态分析,确定共振频率区,确保振动筛在工作时避开共振区,有效的提高设备寿命与安全性。
[Abstract]:Screening machinery has been widely used in all fields of production and life. The traditional screening machinery can not meet the increasing needs of people. The traditional screening machine is less efficient. In modern society, the defects of sieve holes being easily blocked have become more and more obvious in modern society. Chaos theory is a new theory which was put forward in 0th century. It has been proved that chaotic vibration has more advantages than traditional machinery in material screening, better screening efficiency, larger material handling capacity, stronger screening rate and stiffness of parallel mechanism. The characteristics of high precision can be used to construct complex motion curves. In this paper, a new three-degree-of-freedom chaotic vibrating screen is proposed, which integrates the parallel mechanism and chaotic vibration theory. Its motion characteristics are simulated by ADAMS kinematics virtual prototype simulation software. The dynamic characteristics and specific structure of the system are analyzed by using Adams MATLAB ANSYS software. Based on the TRIZ theory, the structure of the vibrating screen is optimized. The specific work is as follows: the first step: the three-degree-of-freedom chaotic vibrating screen according to the requirements of specific design, create three-dimensional model, mathematics and dynamics model. The DOF (degree of freedom) of the vibrating screen was analyzed by using the topological mechanism knowledge, and the DOF was obtained as three translation. The kinematics model is established and analyzed. The second step is to simplify the 3D model of the three-degree-of-freedom chaotic vibrating screen in order to reduce the computational complexity of computer simulation. Then the simplified model is simulated by ADAMS. The third step is to use the post-processing module of MATLAB and ADAMS to recognize the simulation data. 4th steps: based on the TRIZ theory, the amplitude adjustment of the three-degree-of-freedom chaotic vibrating screen is optimized. Enhance the applicability of vibrating screen. 5th steps: use ANSYS finite element analysis software to carry on the sixth order modal analysis to the three-degree-of-freedom chaotic vibrating screen frame to determine the resonance frequency region. Ensure that the vibrating screen avoids the resonance area in operation, effectively improve the equipment life and safety.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH237.6

【参考文献】