基于FIX和中泰数据采集控制卡机舱过程监控

介绍了浅海海底电缆检测与维修装置机舱过程实时监控系统的基本功能和组成结构,采用中泰公司数据采集控制卡构成系统硬件,采用FIX、Fixtools 和VBA对其进行软件开发,实现了机舱过程的实时监控、系统自检和操作仿真培训等功能.     

基于FIX和中泰数据采集控制卡机舱过程监控系统的实现

介绍了浅海海底电缆检测与维修装置机舱过程实时监控系统的基本功能和组成结构,采用中泰公司数据采集控制卡构成系统硬件,采用FIX,Fixtools和VBA对其进行软件开发,实现了机舱过程的实时监控,系统自检和操作仿真培训等功能。     

实时多波束海底地形数据三维瀑布图绘制方法

针对深水多波束测深数据的特点和实时显控的需求,提出了一种通过内存缓存技术以队列方式有效组织多Ping海底测深数据,采用局部更新技术提高数据更新效率,利用查表方法减少顶点高程赋色计算代价,进而结合VBO技术加速渲染过程的实时多波束海底地形探测数据三维瀑布图快速绘制方法,并在三维瀑布图实时绘制过程中实现了支持平移、旋转和缩放等交互操作。对实际多波束海底地形探测数据实时绘制的实验结果表明,该方法高效、稳定、光照效果佳,能很好地满足多波束海底地形探测数据的实时显控需求。     

基于改进YOLO和迁移学习的水下鱼类目标实时检测

为了实现非限制环境中水下机器人基于视频图像的水下鱼类目标快速检测,提出基于改进YOLO和迁移学习的水下鱼类目标实时检测算法.针对YOLO网络的不足,设计适合水下机器人嵌入式系统计算能力的精简YOLO网络(Underwater-YOLO).利用迁移学习方法训练Underwater-YOLO网络,克服海底鱼类已知样本集有限的限制.利用基于限制对比度自适应直方图均衡化的水下图像增强预处理算法,克服水下图像的降质问题.利用基于帧间图像结构相似度的选择性网络前向计算策略,提高视频帧检测速率.实验表明,文中算法能实现在非限制环境下海底鱼类目标的实时检测.相比YOLO,文中算法对海底鱼类小目标和重叠目标具有更好的检测性能.     

基于DSP和FPGA的海底地形匹配辅助导航系统设计

针对海底地形匹配辅助导航系统中需要多路数据同步接收、匹配结果实时回传的特点,设计了基于DSP和FPGA的多通道实时地形匹配辅助导航系统。该系统通过高性能通用DSP芯片实现实时海底地形匹配算法,通过基于FP-GA的SOPC技术实现多通道数据通信接口和数据流控制,具有电路结构简单、对外接口灵活、功能易于扩展、系统结构可重配置的优点。软件仿真和现场试验结果表明,该系统能够良好的满足水下潜器对于海底地形匹配导航系统的实时性、稳定性、扩展性和体积功耗等方面的要求,具有良好的工程应用前景。     

真实感海底场景的实时绘制

海底场景的仿真对于动画游戏、海洋勘测、航海驾驶、灾害救援等有着重要的应用意义。由于涉及更加复杂的海水与光线、地形等的交互,海底场景中的复杂刻蚀、光束、散射等效果是实时绘制海底场景的难点。基于海底环境的物理机理,首先提出基于线框绘制模式结合高斯滤波的方法来模拟精细的刻蚀效果,采用贴近真实的散射相位函数计算海底散射来模拟水下海水颜色,采用柱面组织的光束算法来模拟海底光线效果,并进一步给出一种基于空间划分的海底场景绘制优化方案,最后基于GPU加速技术实现了不同情况下的真实感海底场景的实时绘制。     

视频桩考仪中的图像处理技术

设计了一种不需使用特定考车、可由计算机自动判定考试成绩的汽车驾驶员视频桩考仪。采用CCD摄像机和带有红外探测器的标志杆对考场进行实时监测。通过图像去噪、滤波的图像预处理、运动目标检测、目标跟踪算法、运动目标轨迹描述等图像处理技术,实现了由计算机实时对考车序列图像进行运动轨迹跟踪、桩考汽车的路线、方向、停车和中途停车等信息实时检测和考试人员的操作是否正确的自动判断,保证了考试的公平性和合理性。     

视频桩考仪中的图像处理技术

设计了一种不需使用特定考车、可由计算机自动判定考试成绩的汽车驾驶员视频桩考仪.采用CCD摄像机和带有红外探测器的标志杆对考场进行实时监测.通过图像去噪、滤波的图像预处理、运动目标检测、目标跟踪算法、运动目标轨迹描述等图像处理技术,实现了由计算机实时对考车序列图像进行运动轨迹跟踪、桩考汽车的路线、方向、停车和中途停车等信息实时检测和考试人员的操作是否正确的自动判断,保证了考试的公平性和合理性.     

矿井提升机闸瓦间隙在线智能检测仪设计

阐述了煤矿大设备之一提升机制动系统盘形闸的闸瓦间隙、制动盘偏摆、空动时间监测智能化、实时在线检测仪的设计。通过对矿井提升机煤安规程要求和指标入手,实现了对提升机设备运行时制动系统盘形闸关键参数"闸瓦同隙"的实时、自主检测,同时对发生异常故障情况时进行语音报警,达到人机对话、人机互动,及时发现问题、解决问题。     

海底观测网控制系统设计

海底观测网通过光电复合缆为运行于海底的各种物理、化学、地质、生物等传感器提供连续电能和数据带宽,是近几年海洋科学研究的新的重要手段。介绍了中国科学院重大科技基础设施预先研究项目——南海海底观测示范网控制系统的整体结构、硬件及软件系统设计。经过水池试验表明:研究的控制系统能够实现视频、控制命令等信息通过光纤以太网的实时双向传输,能够实现对电能质量指标和绝缘、漏水等安全指标的实时监控,能够实现故障的智能处理,满足设计要求。     

Experimental study on high viscosity fluid micro-droplet jetting system

Fluid dispensing is a method by which fluid materials(such as epoxy,adhesive,and encapsulant) are delivered in a controlled manner in electronics packaging.Fluid jetting,derived from inkjet technology,is a noncontact,data-driven fluid dispensing technology.But ideal fluid materials for packaging are usually high viscous,which is difficult to realize by traditional inkjet technology.In this paper,a mechanical micro-droplet jetting system for high viscosity fluid was proposed.It consists of dispensing valve,m...     

Effects of trapped air bubbles on frequency responses of the piezo-driven inkjet printheads and visualization of the bubbles using synchrotron X-ray

The reliability of drop formation is one of the key factors for the successful commercialization of inkjet printing applications. However, when the air bubble is entrapped from the nozzle exit, it leads to stop jetting of the droplets immediately. It has been known that the trapped air bubbles inside the chamber prevent a printhead from stable jetting. In this study the synchrotron X-ray has been used to visualize the air bubbles in the flow field inside of the printhead undergoing the standard jetting with the firing frequency of 1–20 kHz. An air pocket of bubble was formed repeatedly and reproduced well through the tested printheads at a certain jetting condition. To see the effects of the bubbles on the dynamic characteristics of the piezoelectric printheads, the piezoelectric velocity on the top of the pressure chamber was measured with a laser vibrometer. When the bubble was trapped at the nozzle exit orifice, the piezo velocity signals showed significantly different frequency peaks appearing in the spectrum and the high frequency components were identified with the frequency response measurements.     

Bond-graph model of a piezostack driven jetting dispenser

Micro liquid jetting technology is widely used in the field of electronic packaging. This paper presents a bond-graph model of a piezostack driven jetting dispenser that can dispense adhesive fluids accurately, rapidly, and flexibly. After describing the structural components and operating principles of the dispenser, the bond-graph model for the system is derived by integrating the electromechanical model with the fluid model. In the bond-graph model, the lumped parameter method is employed to obtain the conceptual bond-graph elements of the adhesive in the channels. Based on the proposed model, the jetting dispenser is designed and manufactured, and its performance is then evaluated through both computer simulations and experiments. Further simulation studies about the working properties based on the bond-graph model is carried out.     

Simple fabrication of high focal number micro-lenses based on a microfluid pulse jetting method

Microsystem Technologies - In this paper, we demonstrate a simple and rapid high focal number (F # ) micro-lens (ML) fabrication method using a simple microfluid pulse jetting technology. The...     

一种便携式桩基测量仪的研制与实现

便携式桩基测量仪采用工控机STD5081、CPU板、STD总线、DMA高速数据采集技术,用大屏幕点阵液晶显示器SED1330作为显示窗口,用小应变动测桩法测量桩的桩长和承载力,体积小,便于携带。     

Performance improvement of a drop-on-demand inkjet printhead using an optimization-based feedforward control method

The printing quality delivered by a drop-on-demand (DoD) inkjet printhead is limited due to the residual oscillations in the ink channel. The maximal jetting frequency of a DoD inkjet printhead can be increased by quickly damping the residual oscillations and by bringing in this way the ink channel to rest after jetting the ink drop. This paper proposes an optimization-based method to design the input actuation waveform for the piezo actuator in order to improve the damping of the residual oscillations. A discrete-time transfer function derived from the narrow-gap model is used to predict the response of the ink channel under the application of the piezo input. Simulation and experimental results are presented to show the applicability of the proposed method.     

Control of high-resolution electrohydrodynamic jet printing

This paper discusses the development of a sensing and feedback-feedforward control system for Electrohydrodynamic jet (E-jet) printing. E-jet printing is a nano-manufacturing process that uses electric field induced fluid jet printing through nano-scale nozzles for achieving better control and resolution than traditional jet printing processes. The printing process is controlled by changing the voltage potential between the nozzle and the substrate. However, it is difficult to maintain constant operating conditions such as standoff height during a run of the printing process. The change in operating conditions results in fluctuating jet frequency and droplet diameter. For stabilizing the jetting frequency across a single run, a two degree of freedom (2 DOF) control algorithm is implemented. The feedforward voltage signal is used to compensate for repeatable changes in the operating conditions and is obtained using an Iterative Learning Control (ILC) algorithm. The feedback controller compensates for uncertainty in jetting operating conditions. The jetting frequency is determined in real time by recording electric current pulses when ink droplets are released from the nozzle. This frequency measurement is then used to control the voltage profile across a run to compensate for changing operating conditions. Experimental results are presented to validate the proposed control method.     

水蒸汽喷射式真空泵的CAD

该文介绍了水蒸汽喷射式真空泵CAD软件的体系结构,着重论述了喷射式真空泵参数优化、参数化绘图及两维零件图自动装配的实现方法。     

粉料生产计算机监控系统的研究

介绍一种应用于工业粉料生产的计算机监控系统的工作原理及软硬件设计方法 ,它不仅能完成日常生产管理 ,还能对喷吹量及补料速度进行全程监测和控制     

Droplet generation in co-flow microfluidic channels with vibration

We quantitatively characterize the perturbed droplet generation in co-flow microfluidics with mechanical vibration by estimating the fluctuations in the flow rate of inner fluid. We show the variation of generation frequency and uniformity of droplets as the frequency and amplitude of vibration. Synchronized droplet generation occurs in certain range of the vibration frequency that is predicted by our model. Besides, we scale the droplet size by incorporating the effects of vibration, inner and outer flows. The vibration is found to be capable of promoting the dripping, suppressing the jetting and even shifting the jetting into the dripping when the jet length is sufficiently short. The delayed dripping–jetting transition is characterized in a phase diagram by taking vibration into consideration. Our results unveil the mechanism of mechanically perturbed droplet generation and provide valuable guidelines for practical applications of vibration-enhanced droplet generation.