Development of a compact tomography camera system using a multianode photomultiplier tube for compact torus experiments

A compact tomography camera system consisting of a photomultiplier tube, a multislit optical system, and a band-pass interference filter has been developed. The viewing area and spatial resolution can be configured by the arrangement of the slit system. The camera system has been specially designed for self-organized compact torus experiments having strong magnetohydrodynamics events with a submicrosecond time-scale. The developed system has been tested on a field-reversed configuration formed by the field-reversed theta-pinch. Performance evaluation of the system has been performed by comparison to the former optical system.     

基于ADAMS及ANSYS的柔性机器人动力学仿真系统

针对 ANSYS不适于机械动力学分析 ,而 ADAMS不适于有限元分析的状况 ,本文首次将 ADAMS及 AN-SYS结合 ,建立了柔性机器人动力学仿真系统。它通过模态中性文件结合 ADAMS及 ANSYS。按功能将此系统分成模块进行二次开发 ,省去复杂的建模及自己编程工作 ,提供了统一的仿真标准。文中通过两个三臂机器人协调操作的算例验证了此系统的有效性和优越性。此系统有较广泛的应用范围 ,能成为 CAD和 CAM的基础     

基于DSP和USB2.0的声音信号采集系统设计

针对声音信号采集系统中单片机作处理器而使系统速度慢及数学运算能力差的问题,构建了基于DSP和USB2.0的高速度,高精度数据采集系统。系统由TLC320AD50C为AD转换器,TMS320VC5402为DSP核心处理器,CY7C68013为USB2.0接口芯片组成。详细阐述了系统的软硬件结构及总体结构设计方案。经测试该设计是一种非常有效的声音信号采集方式,系统具有较高的处理速度和精度以及良好的实时性和扩展性。本系统具有很好的应用前景。     

Phylogeny of the vomeronasal system and of receptor cell types in the olfactory and vomeronasal epithelia of vertebrates.

In this paper, the evolutionary origin of the vomeronasal system as a discrete sensory system separate from olfaction is examined. The presence of a discrete vomeronasal system appears to be a derived character in tetrapods, and its presence in larval amphibians indicates that the system did not arise as a terrestrial adaptation. The vomeronasal system has been lost independently in several taxa, including crocodilians, some bats, cetaceans, and some primates. The presence of microvillar receptor cells in the vomeronasal epithelium appears to be the ancestral condition for tetrapods, and alternative hypotheses concerning the ancestral condition for receptor cell types in the vertebrate olfactory epithelium are discussed. Finally, the possibility that the vomeronasal system is present in some fishes in a form that has not been recognized is discussed in relation to the phylogenetic distribution of receptor cell types in vertebrates.     

MICROCONTROLLER-BASED,LOW-COST DATA-ACQUISITION SYSTEM WITH A DOUBLE ADAPTIVE POLAROGRAPHIC ELECTRODE FOR MEASURING DISSOLVED OXYGEN IN WINE

A microcontroller-based, low-cost data-acquisition system has been developed to measure dissolved oxygen in fluids, applied to wine, using polarographic electrodes in a Clark cell. The prototype consists of a sophisticated adaptation system to amplify correctly the low current that this type of sensor provides. The system compensates for the temperature effect in the measurement. This measurement system supports any type of polarographic electrode sensor because of its adaptive capabilities. It controls the time course of dissolved oxygen and stores the data for subsequent treatment. Furthermore, this system provides information in real time concerning the dissolved oxygen and electrolyte reserves, whereby the value can be recorded and controlled with the proper system of dosage/reduction of gas; also, the user is alerted to replenish the electrolyte when necessary. The system has been tested in real processes, and the results have been quite good.     

内燃机缸套活塞环系统的摩擦学设计

本文在系统思想的指导下,采用理论分析与润滑计算相结合,对内燃机摩擦副缸套一活塞环系统在正常工作时的摩擦,润滑、磨损等摩擦学行为进行了探讨,并根据研究结果。以桶面环为对象,以Ｓ１９５单缸紫机机的参数为例,编掉了通用内燃机摩这设计软件,以实现对内燃机缸套一活塞环系统的摩擦学设计和使用效果的预测。     

Analysis of the robotic disc grinding process

Two major aspects of the robotic rigid disc grinding process, namely, disc wear and grinding forces have been examined in the present study. The disc wear is observed to be nonuniform, being greatest at the outer edge of the disc. A simple wear model has been developed by assuming that the amount of wear can be approximated as having a triangular cross section. The dynamic grinding force model developed includes the effects of disc wear and nonlinear stiffness of the robot system. Experiments have been conducted on an actual robotic grinding system to verify the validity of these system models. Several practical issues which should be considered during robotic grinding are discussed.     

基于MCS-96单片机控制系统的程序失控防范

单片机实时控制系统中，程序失控是经常遇到的问题。通过分析程序失控的原因，提出了防范措施和方法，应用这些措施，可有效提高系统运行的可靠性，使系统具有程序失控自恢复能力。     

滚动轴承振动信号的微机采集和分析系统

本文以286微机为主体建立了振动信号采集和分析系统.系统由信号测量,数据采集,预处理和信号分析几部分组成,能实现幅值域,时域和频域分析.系统的软件有良好的人机界面,使用十分方便.该系统成功地应用于滚动轴承振动信号的采集和统计特性分析,还可以推广应用于其它机械振动信号的采集和分析.     

一种新型气候参数智能模拟系统

文章介绍了一种气候参数智能模拟系统。它除具有普通气候模拟系统的模拟设定值功能外,还可以提前采集气候参数并将参数长期保存于非易失性数据存储器DS1220中,等到需要时再将保存的气候参数再现出来。该系统实现了数据的智能采集和处理。避免了从键盘输入参数,简化了硬件电路。     

A friction drive system for accurate positioning

A transmission system for positioning a conventional moving table has been constructed. The gearbox which has been inserted between the lead screw and the driving stepping motor is of the friction type. The resolution of the system has been measured to be less than 0.01 μm     

弹性梁式构件的运动稳定性分析

结构－控制耦合系统是一种机械负载与驱动控制器相互作用的动态反馈系统。将机械系统和控制系统统一考虑,将驱动机械负载的驱动力也看成是结构－控制耦合系统的内力,则可采用处理力学上保守系统的方法使建模和分析大大简化。采用能量方法对无重力状态下弹性梁运动的相对平衡状态进行分析,得出了系统相对平衡的稳定条件。以此稳定条件作为系统运动的控制参数,有利于使弹性梁的动能转化为驱动－控制系统的电磁势能,这样一方面会加速驱动系统的制动,另一方面会迅速衰减弹性梁的振动。研究工作的结果是为弹性梁提供了一种非常简单有效的实时控制方法,该方法已在多种弹性梁试验系统上得到证实。     

基于SolidWorks二次开发的智能装配技术研究

对机械产品的参数化设计和智能装配技术进行了研究,利用Delphi技术对SolidWorks进行了二次开发,采用Delphi+Access 2003+SolidWorks API的技术方案,开发了某润滑站油箱的参数化设计和智能装配系统.系统采用参数化设计方法,通过数据库将设计参数关联,自动生成所需规格的零部件,使用智能装配技术将零部件装配,提高了设计效率和质量,缩短了设计周期.     

机床加工误差补偿信号的实时测量系统

机床加工误差补偿是提高加工精度的重要途径.正确测量机床主轴误差运动是实现加工误差补偿的前提.然而,这一测试问题一直未得到很好解决.本文提出的用差动传感器直接相对主轴表面测量的系统比较简单,容易实现,且为实时测量.该方法已用于车削加工误差实时补偿系统之中,取得了较好的效果.     

面向对象的模块化柔性生产线并行设计研究

针对模块化柔性生产线方案设计系统的复杂性,研究了面向对象的并行设计系统。通过把设计过程分解为对系统若干对象的设计,提出了面向对象的模块化柔性生产线并行设计过程模型。在此基础上建立统一的全局数据模型,开发了箱体类零件柔性生产线并行设计原型系统,以支持加工对象的特征设计、工艺规划、系统配置结构设计、模块化机床、刀具等设计的并行运行,并进行了实例验证。     

COMBINE HARVESTER INSTRUMENTATION SYSTEM FOR USE IN PRECISION AGRICULTURE

A crop yield and field performance mapping system for New Holland TC-56 rice combine harvester (RCH) for precision agriculture applications has been developed using LabVIEW. A Dewe-2010 PC data acquisition system has been used as a core unit to collect and store the real time field data from different sensors and a differential global positioning system to determine the exact latitude, longitude, and altitude of RCH. Modular software allows programming flexibility in developed hardware. The spatial information has been measured and recorded in real time field testing. Sensors have been calibrated in a laboratory under specific conditions, and excellent measurement linearity has been obtained for most of parameters. The crop and yield performance maps have been obtained in real time from the field tests conducted in Malaysia. These maps will be used in precision agriculture to improve areas of low yield and to improve productivity of rice.     

基于RAM共享的嵌入式多CPU系统研究

嵌入式系统的出现,极大地增强了控制系统的灵活性与多样性,并迅速应用到机械、电子、医疗等领域.但是,随着人们对控制系统的要求不断升级,嵌入式系统不仅要求能够自主运行,还需要能够实现多中央处理单元(CPU)协同作业,并且能够与其他系统进行信息交换.基于随机存取存储器(RAM)共享的嵌入式多CPU系统正是在这样的背景和要求下产生的.经过实际使用证明,该系统能够提高系统的数据、信息处理速度和处理能力.     

一种实用机器人定位系统的研究、实现与改进

在机器人定位技术和光电编码器原理的基础上,研究并实现了仅由光电编码器组成的航位推算（Dead Reckoning,简称DR）定位系统,并通过一系列的实验对这种方案进行了验证。最后通过分析对方案进行了进一步的改进,实现了“基于数据融合技术的光电编码器和陀螺仪DR导航系统”,实测结果表明定位精度有较大改善。     

PTA装置中重型压力离心机监控系统设计

针对重型压力离心机,给出了监控系统设计方案,提出了重型压力离心机数据采集和联锁保护的新方法.上位机选用DELL PC机,基于WindowsXP系统进行工程组态和工艺操作,下位机采用西门子PLC系统实现联锁控制,并成功应用在PTA装置上.     

有挤压油膜阻尼器支承的多故障转子系统的非线性特性研究

研究了有挤压油膜阻尼器、转子与静子碰摩和转轴上的横向裂纹等多种非线性因素作用下的转子系统的非线性响应特征。数值研究发现 ,这类转子系统具有丰富的非线性特性 ,三条通向混沌的道路都存在 ,即阵发性通向混沌、倍周期分叉通向混沌和拟周期通向混沌的道路。系统响应的最大振幅曲线包含了大量的跳跃现象 ,发生这些跳跃所对应的参数点与周期解分叉的参数点相重合 (以前已经发现了这种跳跃现象 ,但没有发现与周期解分叉有关系 )。保持不平衡参数在一个小区间内能够使系统抑制多种故障引起的振幅 ,并使系统能够保持稳定的周期一解。较大的挤压油膜阻尼器参数对系统的振动有明显的抑制作用。当裂纹正方向与不平衡方向成反方向时 ,系统具有最小的振动幅度。