高阶变性傅里叶非圆齿轮络交机构数学建模、参数优化和仿真分析

发布时间：2018-09-07 14:29

【摘要】：在制丝工艺中,络交机构是自动缫丝机的核心部分,其作用是使卷绕于小?上的丝条形成网状丝片。目前国内外较为常见的络交机构主要有:双圆柱凸轮络交机构、周转轮系圆柱凸轮络交机构和周转轮系平板凸轮络交机构,它们虽在一定程度上符合缫丝工艺的要求,但是还存在丝片成型不佳、机构不紧凑、传动效率不高等问题,因而无法实现高速缫丝、丝片容易出现塌边情况、影响干燥质量。针对以上存在的问题,本文提出了高阶变性傅里叶非圆齿轮络交机构,并对其进行了数学建模、参数优化和仿真分析。本文的主要研究内容如下:1)综述了国内外自动缫丝机络交机构研究现状,分析了各自存在的问题。本文提出了新型的高阶变性傅里叶非圆齿轮络交机构,并建立了包括高阶变性傅里叶非圆齿轮副、共轭凸轮机构及曲柄滑块机构的运动学分析的数学模型,编写了具有人机交互功能的高阶变性傅里叶非圆齿轮络交机构运动学分析软件,利用该软件分析了机构主要参数对络交杆运动特性的影响情况;2)介绍了丝条卷绕原理及其规律,将其进行简化,建立了丝条断面成形的数学模型,并编写了具有人机交互功能的丝片断面成形辅助分析软件,利用软件分析了机构主要参数对丝片断面形状的影响情况;3)以理想丝片断面形状为目标,基于遗传算法对新型络交机构各主要参数进行多目标参数优化,获得一组最优的机构参数,并得到了在该组参数下丝片断面形状;4)根据最优的机构参数对新型络交机构进行结构设计,利用UG软件完成新型络交机构的三维建模和虚拟装配。应用虚拟样机仿真分析软件对机构进行了运动学仿真,将仿真结果与理论结果作比较,发现存在一定误差;然后对误差进行分析,考虑到误差存在的必然性,得出仿真结果足以验证本文建立的数学模型是正确的及机构的结构设计是合理的。
[Abstract]:In the silk making process, the winding mechanism is the core part of the automatic reeling machine, its function is to make the winding in the small? The filaments on it form a mesh of filaments. At present, the common collation mechanisms at home and abroad are as follows: double cylindrical cam intersecting mechanism, revolving gear train cylindrical cam intersecting mechanism and turnover gear train flat cam collating mechanism, although they meet the requirements of silk reeling technology to some extent. However, there are still some problems such as poor filaments forming, uncompact mechanism and low transmission efficiency, so it is impossible to realize high speed silk reeling, and the edge collapse of the filaments is easy to occur, which affects the drying quality. In view of the above problems, this paper presents a high-order denatured Fourier non-circular gear intersecting mechanism, and carries on mathematical modeling, parameter optimization and simulation analysis. The main research contents of this paper are as follows: (1) the present situation of the research on the automatic reeling machine is reviewed, and the existing problems are analyzed. In this paper, a new type of high-order denatured Fourier noncircular gear intersecting mechanism is proposed, and a mathematical model for kinematic analysis including high-order denatured Fourier non-circular gear pair, conjugate cam mechanism and crank slider mechanism is established. The kinematics analysis software of high-order denatured Fourier non-circular gear winding mechanism with man-machine interaction is developed. The influence of main mechanism parameters on the kinematic characteristics of the winding rod is analyzed by using the software. 2) the principle and law of wire winding are introduced. The mathematical model of filamentary section forming is established, and the assistant analysis software of filamentary section forming with man-machine interaction is developed. The influence of the main parameters of the mechanism on the shape of the filaments section is analyzed by using the software. (3) taking the ideal shape of the filamentous section as the target, the main parameters of the new type of complexing mechanism are optimized based on genetic algorithm. A set of optimal mechanism parameters is obtained, and the filamentous section shape 4) is obtained. According to the optimal mechanism parameters, the structure of the new mechanism is designed, and the 3D modeling and virtual assembly of the new mechanism are accomplished by using UG software. The kinematics simulation of the mechanism is carried out by using the virtual prototype simulation analysis software. The simulation results are compared with the theoretical results, and some errors are found, and then the error is analyzed, considering the inevitability of the error. The simulation results show that the mathematical model established in this paper is correct and the structure design of the mechanism is reasonable.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TS142;TH132.41

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