Laying head is a high-precision engineering device in hot-rolled high speed wire rod production line. Previously research works are focused on the laying pipe wear-resisting. Laying pipe curve design method based on w...Laying head is a high-precision engineering device in hot-rolled high speed wire rod production line. Previously research works are focused on the laying pipe wear-resisting. Laying pipe curve design method based on wire rod kinematics and dynamics analyses are not reported before. In order to design and manufacture the laying pipe, the motion and force process of the wire rod in the laying pipe should be studied. In this paper, a novel approach is proposed to investigate the force modeling for hot-rolled wire rod in laying pipe. An idea of limited element method is used to analysis and calculates the forces between laying pipe inner surface and wire rod. The design requirements of laying pipe curve for manufacturing are discussed. The kinematics and dynamics modeling for numerical calculation are built. A laying pipe curve equation is proposed by discussing design boundary conditions. Numerical results with di erent laying pipe curves design parameters are plotted and compared. The proposed approach performs good result which can be applied for laying pipe curve design and analysis for engineering application.展开更多
This paper gives an overview of studies on parameters displayed on the Automotive Head Up Display （A-HUD） including calculation and construction of symbology page based on study results. A study has been made on vit...This paper gives an overview of studies on parameters displayed on the Automotive Head Up Display （A-HUD） including calculation and construction of symbology page based on study results. A study has been made on vital parameters required for car drivers and design calculations have been made based on design parameters like field of view, distance from the design eye position, minimum character size viewable from a distance of 1.5m between driver and the projected image, and optical magnification factor. lhe display format suitable for A-HUD applications depends upon the parameters required to be displayed. The aspect ratio chosen is 4：3. This paper also provides method to design the symbology page embedding six vital parameters with their relative positioning and size considering relative position between display device and optical elements which has been considered with a magnification factor of 2.5. The field of view obtained is 6.7° × 4.8°.展开更多
现阶段我国节能减排的具体工作逐渐展开,机械设计中节能减排的研究方向主要围绕机械元件性能提升等方面开展。本文通过数字化平台实现无纸化高效设计,减少重复性开发,提升设计效率,达到减少碳排放的目标。动力头是旋挖钻机的核心部件,...现阶段我国节能减排的具体工作逐渐展开,机械设计中节能减排的研究方向主要围绕机械元件性能提升等方面开展。本文通过数字化平台实现无纸化高效设计,减少重复性开发,提升设计效率,达到减少碳排放的目标。动力头是旋挖钻机的核心部件,具有结构紧凑、噪声小和效率高的特点。针对动力头设计中计算复杂、效率低的问题,开发了旋挖钻机数字化设计平台系统,简化设计流程,缩短设计周期。系统基于Visual Studio 2019平台开发,采用MFC(Microsoft Foundation Classes)框架C++语言编写,将参数化设计、参数传递、参数化分析、工程图管理和数据库管理划分为不同的模块进行设计,实现了零部件参数化设计、有限元分析与工程图自动生成与管理功能的集成。通过调用APDL程序语言,将命令流整合进而构建了完整的有限元分析中的建模、分析、后处理的流程,将传统较为复杂的机械设计流程用程序编写的方式集成到平台,实现部分设计参数的平台自动选取。经验证,设计与测试结果一致,提高了数字化平台的自动化水平和设计效率,通过高效的设计流程实现节能减排的目标。展开更多
基金China Postdoctoral Science Foundation Project(Grant No.2017M611184)
文摘Laying head is a high-precision engineering device in hot-rolled high speed wire rod production line. Previously research works are focused on the laying pipe wear-resisting. Laying pipe curve design method based on wire rod kinematics and dynamics analyses are not reported before. In order to design and manufacture the laying pipe, the motion and force process of the wire rod in the laying pipe should be studied. In this paper, a novel approach is proposed to investigate the force modeling for hot-rolled wire rod in laying pipe. An idea of limited element method is used to analysis and calculates the forces between laying pipe inner surface and wire rod. The design requirements of laying pipe curve for manufacturing are discussed. The kinematics and dynamics modeling for numerical calculation are built. A laying pipe curve equation is proposed by discussing design boundary conditions. Numerical results with di erent laying pipe curves design parameters are plotted and compared. The proposed approach performs good result which can be applied for laying pipe curve design and analysis for engineering application.
文摘This paper gives an overview of studies on parameters displayed on the Automotive Head Up Display （A-HUD） including calculation and construction of symbology page based on study results. A study has been made on vital parameters required for car drivers and design calculations have been made based on design parameters like field of view, distance from the design eye position, minimum character size viewable from a distance of 1.5m between driver and the projected image, and optical magnification factor. lhe display format suitable for A-HUD applications depends upon the parameters required to be displayed. The aspect ratio chosen is 4：3. This paper also provides method to design the symbology page embedding six vital parameters with their relative positioning and size considering relative position between display device and optical elements which has been considered with a magnification factor of 2.5. The field of view obtained is 6.7° × 4.8°.
文摘现阶段我国节能减排的具体工作逐渐展开,机械设计中节能减排的研究方向主要围绕机械元件性能提升等方面开展。本文通过数字化平台实现无纸化高效设计,减少重复性开发,提升设计效率,达到减少碳排放的目标。动力头是旋挖钻机的核心部件,具有结构紧凑、噪声小和效率高的特点。针对动力头设计中计算复杂、效率低的问题,开发了旋挖钻机数字化设计平台系统,简化设计流程,缩短设计周期。系统基于Visual Studio 2019平台开发,采用MFC(Microsoft Foundation Classes)框架C++语言编写,将参数化设计、参数传递、参数化分析、工程图管理和数据库管理划分为不同的模块进行设计,实现了零部件参数化设计、有限元分析与工程图自动生成与管理功能的集成。通过调用APDL程序语言,将命令流整合进而构建了完整的有限元分析中的建模、分析、后处理的流程,将传统较为复杂的机械设计流程用程序编写的方式集成到平台,实现部分设计参数的平台自动选取。经验证,设计与测试结果一致,提高了数字化平台的自动化水平和设计效率,通过高效的设计流程实现节能减排的目标。
