【作者】 杨柳；

【导师】 齐洁；

【作者基本信息】 东华大学 ， 电子信息， 2023， 硕士

【摘要】 熔体纺丝作为化纤纺丝的主要方法,具有工艺流程短、应用范围广、设备简单、环保高效等优点,可用于涤纶、锦纶、丙纶等常见纤维的纺丝成型。在熔体纺丝工艺流程中,熔体制备过程对于后续纺丝产量和成品质量有着至关重要的影响,采用螺杆挤压机进行熔体制备经常遇到熔体均匀性差、分解程度高、原料堵塞等问题,因此对于温度和压力的控制极为严格。本文在熔体纺丝过程时空分布参数建模与仿真的基础上,采用虚拟现实技术模拟熔体的螺杆挤压过程,并开发了一套熔体纺丝的仿真平台。仿真平台可展现螺杆挤压过程的三维动画,用户可观测不同工艺参数下熔体质量指标的变化,并且平台能输出给定的期望指标所需设置的工艺参数。具体研究成果如下:(1)分析了熔体纺丝的工艺生产流程和螺杆挤压过程的运行原理,将螺杆挤压过程划分为部分填充区、耦合移动边界以及完全填充区,基于不同区域的质量守恒和能量守恒建立机理模型。为了方便计算,引入坐标变换,将移动边界转换为固定边界,从而得到固定域系统的数学模型。(2)根据螺杆挤压过程的分布参数模型,结合边界条件,求解出各质量指标的稳态工作点。为了精确控制出口熔体的温度和压力,采用逐段求解的方法计算出螺杆转速、桶体温度等工艺参数。通过python语言完成原系统仿真、固定域系统仿真以及工艺参数仿真,并对仿真结果进行分析。(3)熔体纺丝螺杆挤压过程虚拟仿真平台架构设计。首先,从技术需求和业务需求两方面展开平台需求分析。然后,针对具体需求完成平台总体架构设计和基本功能设计,包括前端模块功能设计、后端模块功能设计以及动画模块功能设计。最后,根据各模块的基本功能来选择合适的开发技术框架。(4)熔体纺丝螺杆挤压过程虚拟仿真平台具体实现。基于虚拟仿真平台的业务需求,将仿真平台拆分为注册登录、仿真参数、仿真结果、纺丝动画等若干模块,采用前后端分离的开发模式来实现模块化开发。用户通过设置不同的工艺参数能够得到熔体的质量指标变化情况,同时也能够设置期望的熔体质量指标来得到所需的工艺参数。最终基于各大主流浏览器完成虚拟仿真平台的功能测试和兼容性测试,并对系统性能进行优化。更多还原

【Abstract】 As the main method of chemical fiber spinning,melt spinning has the advantages of short process flow,wide application range,simple equipment,environmental protection and high efficiency.It can be used for spinning and forming of common fibers such as polyester,nylon,polypropylene,etc.In the melt spinning process flow,the melt preparation process has a critical impact on the subsequent spinning output and the quality of the finished product.The use of screw extruder for melt preparation often encounters problems such as poor melt uniformity,high degradation,and raw material blockage,so the control of temperature and pressure is extremely strict.Based on the modeling and simulation of spatial and temporal distribution parameters of melt spinning process,this topic uses virtual reality technology to simulate the screw extrusion process of melt,and develops a simulation platform for melt spinning.The simulation platform can show the three-dimensional animation of the screw extrusion process.The user can observe the change of the melt quality index under different process parameters,and the platform can output the process parameters required for the given expected index.The specific research results are as follows :(1)The production process of melt spinning and the operation principle of screw extrusion process were analyzed.The screw extrusion process was divided into partial filling zone,coupled moving boundary and complete filling zone.The mechanism model was established based on the mass conservation and energy conservation of different regions.In order to facilitate the calculation,coordinate transformation was introduced to transform the moving boundary into a fixed boundary,so as to obtain the mathematical model of the fixed domain system.(2)According to the distributed parameter model of screw extrusion process and boundary conditions,the steady working points of each quality index were solved.In order to accurately control the temperature and pressure of the melt at the outlet,the process parameters such as screw speed and can-body temperatures were calculated by solving the problem step by step.Original system simulation,fixed domain system simulation and process parameter simulation were completed through python language,and the simulation results were analyzed.(3)Design of virtual experimental platform architecture for melt spinning screw extrusion process.First of all,the platform requirements were analyzed from two aspects: technical requirements and business requirements.Then,the overall architecture design and basic function design of the platform were completed for specific requirements,including front-end module function design,back-end module function design and animation module function design.Finally,according to the basic functions of each module,appropriate development technology frameworks were selected.(4)The virtual experimental platform for the extrusion process of melt spinning screw was realized.Based on the business requirements of the virtual simulation platform,the simulation platform was divided into several modules such as registration login,simulation parameters,simulation results,and spinning animation.The front-end and back-end separation development mode was used to achieve modular development.Users can get the change of melt quality index by setting different process parameters,and can also set the expected melt quality index to get the required process parameters.Finally,based on the major mainstream browsers,the functional test and compatibility test of the virtual simulation platform were completed,and the system performance was optimized.更多还原