Status of the laser ion source at IMP

A laser (Nd:YAG laser, 3 J, 1064 nm, 8-10 ns) ion source has been built and under development at IMP to provide pulsed high-charge-state heavy ion beams to a radio frequency quadrupole (RFQ) for upgrading the IMP accelerators with a new low-energy beam injector. The laser ion source currently operates in a direct plasma injection scheme to inject the high charge state ions produced from a solid target into the RFQ. The maximum power density on the target was about 8.4 × 10(12) W∕cm(2). The preliminary experimental results will be presented and discussed in this paper.     

基于键合图的含移动铰机电耦合系统动力学建模与仿真

针对含有移动铰的机电耦合系统动力学建模与仿真问题,提出了相应的键合图法.基于平面移动铰的运动约束条件,阐述了建立平面移动铰键合图模型的一般方法及其动力学原理.在考虑混合因果关系情况下,推导出便于计算机自动生成的系统状态方程及运动副约束反力方程的统一公式,实现了含移动铰机电耦合系统一体化建模与仿真,通过实例说明本文方法的有效性.     

基于PXI总线的飞机自主式液压舵机试验台设计

提出基于PXI总线的飞机自主式液压舵机试验台设计,给出了液压舵机试验台的硬件组成,设计了相对应的信号适配器,设计了调试校准软件和测试软件。试验证明该测试系统具有效率高、误差小和自动化程度高等特点,具有良好的推广应用前景。     

Effect of forces on dynamic metal transfer behavior of cable-type welding wire gas metal arc welding

A cable-type welding wire (CWW) gas metal arc welding (GMAW) method was proposed as a novel approach, using CWW for the consumable electrode. Droplet transfer influences the welding process, and the forces on the droplet were analyzed to elucidate the metal transfer phenomenon observed during the welding process. The effects of the arc pressure, rotating force, and welding parameters were analyzed to understand the metal transfer. The special structure of the CWW affected the arc characteristics and forces during metal transfer as part of the welding process. The droplet formed by droplets from each thin wire, the arc, and electromagnetic forces on droplet formation and the coupling process were analyzed. The arc pressure and rotating forces are beneficial to metal transfer and increase the droplet transfer frequency. The droplet size decreases with increasing welding parameters.     

Optimized bending angle distribution function of contour plate roll forming

Regarding the roll forming of contour plates, traditional roll forming techniques often result in peak longitudinal strain during the forming process, which causes defects such as longitudinal bowing and springback. The bending angle, sheet thickness, and the number of forming passes are all important process parameters that cause the aforementioned problems. This study proposes quantifying the projection track regarding the edge of the profile section in the horizontal plane that follows a cubic curve and uses the curve function to reasonably distribute the bending angle to study the maximum forming strain and the average strain for all passes of the sheet between the forming passes. Simultaneously, the influence law of the sheet thickness and number of forming passes was studied. Based on theoretical simulation and experimental verification, the optimal bending angle distribution function is A1: y?=?x³?+?x²?+?x. When the thickness of the sheet is 1.5 mm, both the maximum forming strain between the passes during roll forming and the average strain of all passes are the smallest, which are 3.91 and 0.609%, respectively. Moreover, with the increase in the number of passes, the longitudinal bowing and springback decrease to varying degrees.     

基于磁通门技术的方位传感器设计

磁通门技术是一种非电量磁测法，它利用由高磁导率、低矫顽力的软磁材料作成的铁芯在激磁作用下，感应线圈出现随环境磁场强度而变的偶次谐波分量电势的特征，然后通过高性能的滤波器测量偶次谐波分量。文中介绍了以磁通门技术为工作原理的方位传感器设计，主要包括磁通门的工作原理、铁芯的热处理工艺、二轴磁通门传感器的结构设计及电路原理。     

粮食水分在线检测控制系统

介绍了一种用于颗粒状粮食水分在线检测控制系统。该系统将圆柱型结构的粮食水分检测传感器置于干燥设备的出口、入口处，粮食水分变化导致传感器电容量变化，经过精密的信号采集、转换与处理，完成粮食水分的在线实时检测。该传感器还借助微处理器对测量信号的非线性与温度漂移进行了数字化的修正和补偿。反馈信号输出控制变频器，从而实现控制排粮机构运行转速。根据需要，该系统可以增加打印干燥机的多个工作参量，实现对料位及热风温度的控制等辅助功能以及自动报警功能。     

易燃易爆环境下激光液位监测系统的研究与实现

本文采用激光测距仪DISTO和V仃转换器AD421，设计出一种能在易燃易爆环境中工作、符合国家本质安全的激光液位监测系统。该系统是一种新型的非接触式智能液位测量仪表，具有成本低、操作方便、精度高等优点，可取代目前这些领域中广泛使用的二次仪表，具有广泛的应用前景。     

LEM电流传感器在电力设备介电特性在线监测中的应用

介绍了LEM电流传感器在进行变电站高电压设备绝缘性能在线监测中的应用,对传感器的特性,标准电压信号的选取,误差往返来源及其分析,测量电路的构成,在线测量系统还存在的问题进行了讨论。     

基于超微马达的医用内窥监视系统研究

文中在对传统内窥镜系统工作机理分析的基础上,针对医学临床应用的实际需要,设计开发了基于1mm直径的电磁型微马达的硬管内窥镜全视角监控系统。