Hydrostatic guideways have various applications in precision machine tools due to their high motion accuracy. The analysis of motion straightness in hydrostatic guideways is generally ignoring the external load on the...Hydrostatic guideways have various applications in precision machine tools due to their high motion accuracy. The analysis of motion straightness in hydrostatic guideways is generally ignoring the external load on the slider. A variation force also exists, caused by the different working positions, together with the dead load of the slider and that of other auxiliary devices. The effect of working position on vertical motion straightness is investigated based on the equivalent static model, considering the error averaging effort of pressured oil film in open hydrostatic guideways. Open hydrostatic guideways in LGF1000 are analyzed with this approach. The theoretical results show that the slider has maximum vertical motion straightness when the working position is closer the guiderail of Y axis. The vertical motion straightness reaches a minimum value as the working position is located at the center of the two guiderails on the Y axis. The difference between the maximum and minimum vertical motion straightness is 34.7%. The smaller vertical motion straightness is attributed to the smaller spacing of the two pads centers, along the Y direction. The experimental results show that the vertical motion straightness is 4.15 μm/1200 mm, when the working position is located in the middle of the Xbeam, and 5.08 pro/1200 mm, when the working position is approaching the Y guiderails, denoting an increase of 18.3%. The changing trends of the measured results validate the correctness of the theoretical model. The research work can be used to reveal the variation law of accuracy of the open hydrostatic guideways, under different working positions, to predict the machining precision, and provides the basis for an error compensation strategy for gantry type grinding machines.展开更多
为了减小配电网带电作业的人身安全风险,降低电力系统的运维成本,文中设计了一种面向配电网作业的半人形智能机器人系统,包括硬件结构和控制系统设计。不同于绝缘杆作业法,该系统通过佩戴数据手套和腕部红外追踪器等多模态可穿戴设备来...为了减小配电网带电作业的人身安全风险,降低电力系统的运维成本,文中设计了一种面向配电网作业的半人形智能机器人系统,包括硬件结构和控制系统设计。不同于绝缘杆作业法,该系统通过佩戴数据手套和腕部红外追踪器等多模态可穿戴设备来捕捉人体动作和作业细节,并采用动态运动基元(dynamic movement primitives, DMP)将人体数据映射到半人形机器人的机械臂和末端灵巧手来进行配网作业。测试结果表明:所设计的半人形机器人系统能够稳定跟踪人体演示细节。在模拟配电网线路中可以完成多种作业功能,作业实验成功率可达88.9%。展开更多
基于Solid Works Motion软件对螺旋面土肥混合装置进行了运动仿真研究。采用不考虑颗粒相互作用的单颗粒与螺旋面接触的简化模型通过运动仿真分析颗粒运动轨迹和运动速度与螺旋搅拌轴转速、螺距及颗粒位置之间的关系。仿真实验结果表明...基于Solid Works Motion软件对螺旋面土肥混合装置进行了运动仿真研究。采用不考虑颗粒相互作用的单颗粒与螺旋面接触的简化模型通过运动仿真分析颗粒运动轨迹和运动速度与螺旋搅拌轴转速、螺距及颗粒位置之间的关系。仿真实验结果表明:颗粒运动轨迹受螺旋搅拌轴转速影响较大,颗粒x/y方向速度随搅拌轴转速基本成线性增大关系,受位置和螺距影响相对较小;颗粒z方向速度主要受螺距的影响,随着螺距增大,z方向最大速度明显增大。展开更多
The model of effective segregation coefficient(Keff) of solute atoms has been developed by considering the effect of environment work on barrier potential of atom motion at solid/liquid interface.It was found that not...The model of effective segregation coefficient(Keff) of solute atoms has been developed by considering the effect of environment work on barrier potential of atom motion at solid/liquid interface.It was found that not only the amount but also the type of environ ment work strongly affected the Keff in addition to the growth velocity R.展开更多
In the cotton factories ginning process bales of raw cotton in cotton tube transporting through the air has written in the article. As a result, cotton with cotton in the air separated by a separator device with air t...In the cotton factories ginning process bales of raw cotton in cotton tube transporting through the air has written in the article. As a result, cotton with cotton in the air separated by a separator device with air traffic, has an important theoretical study. First of all, the air flow that affects the dynamic pressure and laws is based on the model established in this study and the results are obtained.展开更多
基金Supported by National Natural Science Foundation of China(Grant No.51275395)National Science and Technology Major Project of Ministry of Science and Technology of China(Grant No.2012ZX04002–091)the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents,China(Grant No.2014RCJJ022)
文摘Hydrostatic guideways have various applications in precision machine tools due to their high motion accuracy. The analysis of motion straightness in hydrostatic guideways is generally ignoring the external load on the slider. A variation force also exists, caused by the different working positions, together with the dead load of the slider and that of other auxiliary devices. The effect of working position on vertical motion straightness is investigated based on the equivalent static model, considering the error averaging effort of pressured oil film in open hydrostatic guideways. Open hydrostatic guideways in LGF1000 are analyzed with this approach. The theoretical results show that the slider has maximum vertical motion straightness when the working position is closer the guiderail of Y axis. The vertical motion straightness reaches a minimum value as the working position is located at the center of the two guiderails on the Y axis. The difference between the maximum and minimum vertical motion straightness is 34.7%. The smaller vertical motion straightness is attributed to the smaller spacing of the two pads centers, along the Y direction. The experimental results show that the vertical motion straightness is 4.15 μm/1200 mm, when the working position is located in the middle of the Xbeam, and 5.08 pro/1200 mm, when the working position is approaching the Y guiderails, denoting an increase of 18.3%. The changing trends of the measured results validate the correctness of the theoretical model. The research work can be used to reveal the variation law of accuracy of the open hydrostatic guideways, under different working positions, to predict the machining precision, and provides the basis for an error compensation strategy for gantry type grinding machines.
文摘为了减小配电网带电作业的人身安全风险,降低电力系统的运维成本,文中设计了一种面向配电网作业的半人形智能机器人系统,包括硬件结构和控制系统设计。不同于绝缘杆作业法,该系统通过佩戴数据手套和腕部红外追踪器等多模态可穿戴设备来捕捉人体动作和作业细节,并采用动态运动基元(dynamic movement primitives, DMP)将人体数据映射到半人形机器人的机械臂和末端灵巧手来进行配网作业。测试结果表明:所设计的半人形机器人系统能够稳定跟踪人体演示细节。在模拟配电网线路中可以完成多种作业功能,作业实验成功率可达88.9%。
文摘基于Solid Works Motion软件对螺旋面土肥混合装置进行了运动仿真研究。采用不考虑颗粒相互作用的单颗粒与螺旋面接触的简化模型通过运动仿真分析颗粒运动轨迹和运动速度与螺旋搅拌轴转速、螺距及颗粒位置之间的关系。仿真实验结果表明:颗粒运动轨迹受螺旋搅拌轴转速影响较大,颗粒x/y方向速度随搅拌轴转速基本成线性增大关系,受位置和螺距影响相对较小;颗粒z方向速度主要受螺距的影响,随着螺距增大,z方向最大速度明显增大。
文摘The model of effective segregation coefficient(Keff) of solute atoms has been developed by considering the effect of environment work on barrier potential of atom motion at solid/liquid interface.It was found that not only the amount but also the type of environ ment work strongly affected the Keff in addition to the growth velocity R.
文摘In the cotton factories ginning process bales of raw cotton in cotton tube transporting through the air has written in the article. As a result, cotton with cotton in the air separated by a separator device with air traffic, has an important theoretical study. First of all, the air flow that affects the dynamic pressure and laws is based on the model established in this study and the results are obtained.
