To solve the existing problems of imperfect sealing and the inaccurate measurement of gas pressure in traditional sealing,the present study builds a new model of capsule-slime sealing device based on wireless pressure...To solve the existing problems of imperfect sealing and the inaccurate measurement of gas pressure in traditional sealing,the present study builds a new model of capsule-slime sealing device based on wireless pressure gauge.The new sealing device is mainly composed of two sets of capsules,a capsule connecting piece and a slime part,measures the pressure through the wireless communication technology,and seals through chemical reaction in the capsule,which generates gas to expand the capsule and extrude the pre-stored slime.Two methods of extruding pre-stored slime are proposed:in the first method,transverse force is generated by the expansion of the capsules at both ends,pushing the capsules toward the middle through the chute and squeezing the pre-stored slime out;in the second,high-pressure gas generated in the capsules is led into the expansion tube,which is inserted into the storage tube,squeezing it and letting the slime out to complete the sealing process.Then the research studies the effect of sealing under the condition of drilling with the structure of slime storage tube.The results indicate that the maximum standing time of slime wrapped in metal net is 2 h,instead of the expected 10 d,failing to meet the sealing requirements.When the slime viscosity is 1200–3000 m Paás in the structure of slime storage tube,the best viscosity of slime is achieved and can simulate sealing the drilling hole(5–4,4–2.36,2.36–1.18,1.18–0.15 mm in diameter),as well as the gap caused by mixed sand accumulation.展开更多
为研究高空低气压、低温环境下的电晕放电特性,研制了由气压泵、气压计、温控箱、密闭气罐、高压静电源、动态电位测试仪等组成的低气压、低温环境电晕放电模拟试验系统。该系统可实现10-2 Pa^100 k Pa范围内的气压调节和-60~20℃范围...为研究高空低气压、低温环境下的电晕放电特性,研制了由气压泵、气压计、温控箱、密闭气罐、高压静电源、动态电位测试仪等组成的低气压、低温环境电晕放电模拟试验系统。该系统可实现10-2 Pa^100 k Pa范围内的气压调节和-60~20℃范围内的温度调节,满足试验所需的气压和温度要求。并利用此系统进行了不同气压下的电晕放电试验,初步得到了电流波形随气压的变化规律。试验结果表明:在10~100 k Pa气压范围内,当温度、湿度等其他环境因素基本不变时,随着气压的降低,电晕放电电流脉冲上升沿及放电形成所需要的时间增加,而放电电流脉冲下降沿和持续时间基本不变,分别约为320 ns和600 ns。展开更多
针对当前精密压力表标准装置检定教学中存在的理论教学过于抽象、多媒体视频教学缺少互动、实验教学设备昂贵的问题,设计了一种精密压力表标准装置检定仿真教学系统。使用3DMAX建模软件创建精密压力表标准装置检定设备模型,Photoshop软...针对当前精密压力表标准装置检定教学中存在的理论教学过于抽象、多媒体视频教学缺少互动、实验教学设备昂贵的问题,设计了一种精密压力表标准装置检定仿真教学系统。使用3DMAX建模软件创建精密压力表标准装置检定设备模型,Photoshop软件处理设备贴图,Adobe After Effects软件制作教学视频,然后利用Unity3 D虚拟仿真引擎搭建虚拟仿真教学系统。系统包括结构原理展示、视频动画教学和虚拟仿真实操三种教学方式,实现了精密压力表标准装置检定仿真教学的功能,交互式设计能够增加学生的学习热情和效率,弥补了传统教学方式的不足。测试表明,系统具有开发成本低、沉浸性强和教学效果好的特点。展开更多
基金the support from the National Key Research and Development Program of China (No. 2017YFC0805201)the Fundamental Research Funds for the Central Universities of China (No. 2017CXNL02)+1 种基金the program for Innovative Research Team in University of Ministry of Education of China (No. IRT13098)the Priority Academic Program Development of Jiangsu Higher Education Institutions of China (PAPD)
文摘To solve the existing problems of imperfect sealing and the inaccurate measurement of gas pressure in traditional sealing,the present study builds a new model of capsule-slime sealing device based on wireless pressure gauge.The new sealing device is mainly composed of two sets of capsules,a capsule connecting piece and a slime part,measures the pressure through the wireless communication technology,and seals through chemical reaction in the capsule,which generates gas to expand the capsule and extrude the pre-stored slime.Two methods of extruding pre-stored slime are proposed:in the first method,transverse force is generated by the expansion of the capsules at both ends,pushing the capsules toward the middle through the chute and squeezing the pre-stored slime out;in the second,high-pressure gas generated in the capsules is led into the expansion tube,which is inserted into the storage tube,squeezing it and letting the slime out to complete the sealing process.Then the research studies the effect of sealing under the condition of drilling with the structure of slime storage tube.The results indicate that the maximum standing time of slime wrapped in metal net is 2 h,instead of the expected 10 d,failing to meet the sealing requirements.When the slime viscosity is 1200–3000 m Paás in the structure of slime storage tube,the best viscosity of slime is achieved and can simulate sealing the drilling hole(5–4,4–2.36,2.36–1.18,1.18–0.15 mm in diameter),as well as the gap caused by mixed sand accumulation.
文摘为研究高空低气压、低温环境下的电晕放电特性,研制了由气压泵、气压计、温控箱、密闭气罐、高压静电源、动态电位测试仪等组成的低气压、低温环境电晕放电模拟试验系统。该系统可实现10-2 Pa^100 k Pa范围内的气压调节和-60~20℃范围内的温度调节,满足试验所需的气压和温度要求。并利用此系统进行了不同气压下的电晕放电试验,初步得到了电流波形随气压的变化规律。试验结果表明:在10~100 k Pa气压范围内,当温度、湿度等其他环境因素基本不变时,随着气压的降低,电晕放电电流脉冲上升沿及放电形成所需要的时间增加,而放电电流脉冲下降沿和持续时间基本不变,分别约为320 ns和600 ns。
文摘针对当前精密压力表标准装置检定教学中存在的理论教学过于抽象、多媒体视频教学缺少互动、实验教学设备昂贵的问题,设计了一种精密压力表标准装置检定仿真教学系统。使用3DMAX建模软件创建精密压力表标准装置检定设备模型,Photoshop软件处理设备贴图,Adobe After Effects软件制作教学视频,然后利用Unity3 D虚拟仿真引擎搭建虚拟仿真教学系统。系统包括结构原理展示、视频动画教学和虚拟仿真实操三种教学方式,实现了精密压力表标准装置检定仿真教学的功能,交互式设计能够增加学生的学习热情和效率,弥补了传统教学方式的不足。测试表明,系统具有开发成本低、沉浸性强和教学效果好的特点。
