【作者】 郑疏桐；

【导师】 郑建荣；

【作者基本信息】 华东理工大学 ， 机械电子工程， 2012， 硕士

【摘要】 高速化是国内外织机的发展趋势,高速织机机械系统动态性能与结构优化成为研发新型织机的核心技术,本文利用虚拟样机仿真分析技术并结合有限元方法和三维造型技术,从系统分析的角度,对织机机械系统包括引纬机构、打纬机构等进行研究和优化。首先应用Solidworks三维造型软件及ADAMS虚拟样机分析软件,建立引纬机构的虚拟样机物理模型并仿真分析,得到了关键零件受力、驱动力矩、剑杆位移速度加速度等仿真结果曲线；根据引纬机构虚拟样机受力的动态仿真结果,利用ANSYS有限元分析软件对引纬机构上的关键零件进行强度校核,对关键零件的结构进行了优化,在保证强度的前提下,有效地降低了零件的重量,改善了引纬机构动态性能,得到有利于高速化织机运转的引纬机构部件。高速织机打纬机构的动态性能是影响织机性能的主要因素之一,本文针对打纬筘座机构提出了两种动平衡结构方案,对其中较优的方案进行了筘座系统动平衡优化,使用有限元分析校核了关键零件的强度和筘座机构的固有频率,得到了新型的打纬筘座机构。对织机打纬传动系统的打纬曲线进行了分析研究,提出了种基于打纬力的打纬曲线设计方法,针对共轭凸轮打纬传动机构中的共轭凸轮机构,使用参数化设计进行了共轭凸轮正向设计,得到了基于打纬力的共轭凸轮轮廓曲线。最后针对目前国内制造企业共轭凸轮打纬机构存在测绘二次误差的问题,提出了基于ADAMS运动学仿真的共轭凸轮副凸轮曲线的反求修正方法,研究结果表明采用该方法修正优化后的共轭凸轮打纬机构可以有效消除凸轮曲线误差,动态性能有明显的改善。更多还原

【Abstract】 Nowadays, the high speed is the trend of the loom, and the dynamic performance and structure optimization for the mechanical system of high-speed loom system becomes the core technique of new loom. In this paper, the mechanical system of loom including weft insertion mechanism and beat-up mechanism will be researched and optimized by virtual prototyping analysis technique, in the way of system analysis, combining finite elements analysis (FEA) and 3D modeling techniques.First,3D modeling software and virtual prototyping analysis software is used to establish the weft insertion mechanism physical model and do the simulation analysis, gaining the simulation result curves including force of important parts, motion torque, ribbon position, velocity and acceleration and so on. Then FEA software is used to check the stress of important parts and optimize their structure according to the result of simulation analysis, and to optimize the structure of important parts, descending the weight of parts efficiently and improving the dynamic performance of weft insertion mechanism, gaining the parts of weft insertion mechanism benefitted to high-speed loom. Dynamic equilibrium is one of the important fact to impress the dynamic performance of the loom in a high speed and two proposals are proposed for the dynamic equilibrium of race mechanism in this paper, then a better one is chose to optimize it, and after that FEA software is used to check stress of it’s important parts and it’s natural frequency, gaining the new type of beat-up mechanism. Furthermore, a way of designing beat-up curve based on beat-up force is proposed for the beat-up mechanism in this paper, and a top-down design of conjugate cam in conjugate cam beat-up mechanism has been done by parametric design, gaining the profile curve of conjugate cam based on beat-force. Finally, in this paper, an optimization of conjugate cam based on ADAMS is proposed to modify quadric error resulting from measuring in our country’s manufacture enterprises, and the results demonstrate the error of cam curve is eliminated efficiently and the dynamic performance of conjugate cam mechanism has improved obviously after optimization.更多还原