潜伏浇口型腔板-推杆二级推件薄圆盘注塑模

设计了一种特殊的潜伏浇口型腔板-推杆二级推件薄圆盘注塑模，论述了模具结构特点和工作原理。该模具采用潜伏浇口型腔板-推杆二级脱模机构。推出塑件时，先依靠与塑件接触面积大的型腔板推动塑件，使塑件先与型芯分离，然后推杆将塑件推出型腔。模具结构简单紧凑，工作可靠，操作方便，成型塑件质量好。     

Prediction of dispersed phase holdup in a modified multi‐stage bubble column scrubber

This paper reports on the experimental investigation carried out to evaluate fractional dispersed phase holdup for a gas‐liquid mixture in a modified multi‐stage bubble column (with contraction and expansion disks), which has been conceived, designed and fabricated as a wet scrubber for control of air pollution; in addition it has versatile use as a gas‐liquid contactor in chemical process industries. A correlation developed for predicting fractional dispersed phase holdup has been found to be encouraging and highly significant from statistical analysis.     

气浮塔处理含油废水的研究

在实验研究的基础上，结合单级气浮技术和多级板式塔理论，开发出两级气浮塔处理含油废水的新工艺，实现了塔釜一次曝气、多级气浮的分离。实验研究了气浮塔板的流体力学性能、布气性能及操作条件对废水处理效率的影响，结果表明二级气浮塔处理效果很好，是一种具有良好应用前景的新型含油废水处理装置。     

面向数字舞台表演的海龟机器人系统研制

针对所创作的机器人戏剧剧本,研制一套用于数字舞台表演的大型海龟机器人系统.该机器人由机械系统和控制系统组成,机械部分由4条3DOF模块化轻型腿、一套具有连续曲率的柔性脖子、龟壳开合装置和碳纤维框架组成,所有电机、电路板等机电部件安装于躯干中,通过同步带将电机的运动传递到外端,降低了悬臂部分的尺寸和质量,减轻了电机的负载.系统的控制部分由上位机及嵌入式控制器组成,分别提供顶层的人机交互和底层的关节实时控制功能.采用重心自调整的方法规划运动步态,确保多足运动的稳定性.经大量实验,研制、开发了样机,完成了机器人戏剧的公演,所研制的机器人可以完美地演绎戏剧角色,外形美观,惹人喜爱,表演效果极佳.     

Optimization of Waste Gate Drive Circuit of Two-Stage Turbocharging System

A two stage turbocharging control system was proposed, in which the pressure regulator valve with a close-loop pressure adjusting function instead of a high speed on-off solenoid valve, is used as a driving mechanism of waste gate. A digital-analog (DA)conversion circuit based on pulse width modulation (PWM) generates one analog voltage signal required by the pressure regulating valve control. The principle of the DA conversion circuit was analyzed, meanwhile, the performance of the conversion circuit was improved by adopting a speed-up capacitor, which helps to increase the stability and responsiveness of the control voltage generated by the conversion circuit; the structure parameters of the circuit was optimized by simulation. After the optimization, the ripple wave of circuit output voltage was kept within 16.mV under the 12.bit conversion accuracy, the conversion time of the circuit could be reduced to 4.ms. The engine bench test show that the turbocharging boost pressure control system which adopted the circuit had a rather good stable control accuracy(the steady state within 0.8%) and dynamic response(the regulation time is less than 4.s).     

基于塑性损伤模型的管片接头阶段分析

基于上海地铁13号线管片接头足尺加载实验,结合ABAQUS中混凝土塑性损伤模型和混凝土结构设计规范,对混凝土CDP模型的参数进行标定,并建立盾构管片接头塑性损伤三维有限元模型,研究管片接头在弯矩和轴力共同作用下的损伤破坏的全过程,对破坏过程中四个阶段的弯矩、裂缝张开量、挠度和损伤之间的关系进行详细分析。结果表明:塑性损伤模型计算得到的挠度-荷载曲线和试验曲线吻合较好,管片接头经历全截面受压阶段、小变形阶段、大变形阶段和接头接触挤压破坏阶段。以裂缝张开量为基础,结合管片接头挠度、弯矩和拉伸损伤带的损伤平均值,提出盾构管片接头损伤破坏的健康评价指标。     

超空泡航行体加速段控制设计

为研究超空泡航行体在加速阶段动力学建模及稳定控制设计问题,根据空泡截面独立膨胀原理研究了空泡形态及其轴线的偏移,并考虑了空泡记忆效应、重力、空化器定向效应及航行体攻角的影响.采用细长体理论计算了超空泡航行体各区域的流体动力,建立超空泡航行体加速段纵平面内运动数学模型,设计了基于输入输出精确线性化的深度跟踪控制器,并对此进行数学仿真.仿真结果表明:控制器跟踪效果良好;滑行力在极短时间内变为零,有利于提高航行体的稳定性及减小部分沾湿区的摩擦阻力.     

基于中国团餐发展阶段的供需状况及趋势研究

随着经济的发展和人民生活的提高,餐饮社会化发展态势良好,其中团餐的发展获得了良好的发展机遇。文章以中国团餐发展的五个阶段为基础,从供需两个方面对团餐的经营模式与市场结构进行分析,提出中国团餐发展的市场化、竞合化、产业化、集约化、品牌化、信息化、科学化、安全化、美感化、人才化等十个方面的趋势。     

基于 IP 网络的舞台视频监督与调度系统研究

针对目前国内舞台数字视频监控系统数据存储调用不灵活、可靠性差以及难以与其他系统兼容等问题,提出了以网络摄像机、流媒体服务器和IP存储区域网络（ IP SAN）为基础的网络化的舞台视频监督与调度系统,并对系统进行了结构设计。分析了系统的主要功能以及各主要单元的性能,结果表明,基于IP网络的舞台视频监督与调度系统能够满足现代舞台演出效果呈现与监控的要求,可显著提高整个舞台监督调度的效率。     

Estimation and correction method for the two-dimensional positionerrors of a planar XY stage based on motion error measurements

This paper describes an estimation and correction method for the two-dimensional (2D) position errors of a planar XY stage that is driven along the Y-axis by two linear motors. The 2D position errors of the stage were estimated and corrected based on measured motion errors from a conventional laser interferometer system. To compensate for the planar XY stage 2D position errors, corrections were introduced for the yaw, perpendicular, straightness and 1D position errors along each axis, which are predominantly caused by linear scale, yaw, and pitching motion errors. The effect of the motion error corrections was evaluated by diagonal measurements based on the ISO230-6 standard and six different 1D position error measurements along the X and Y-axes. By applying error motion corrections, the diagonal systematic deviation at the center point was improved from 499.7 μm to 1.16 μm, and the estimated maximum 2D position errors were improved to −0.263 and 0.530 μm in the X and Y directions, respectively. The diagonal systematic deviation at a corner point was 1.23 μm and the estimated maximum difference between the corner and center points improved from −2.603 and 2.603 μm to −0.05 and 0.12 μm in the X and Y directions respectively.