基于ADuC845的嵌入式配料称重系统设计与实现

对具有CAN总线接口的称重仪表为核心的配料称重系统进行了研究.介绍了配料称重系统的组成、称重仪表软硬件电路设计与实现,重点以ADU0845单片机为微控制器,通过CAN总线接口和嵌入式操作系统RTX51 Tiny实现了现场各配料皮带秤与远程上位机的通信.实际运行表明,该系统工作稳定可靠,通信实时,具有一定的实用价值.     

基天RTX51嵌入式实时操作系统的智能称重仪表的研究

本文率先在SOC片上采用RTX51嵌入式实时操作系统开发智能称重仪表,采用先进的∑-△数据转换技术和数字滤波算法达到精度及实时性的要求.重点阐述了如何在RTX51操作系统下进行软件任务的划分,并介绍了本系统相关的硬件设计.     

基于RTX51嵌入式实时操作系统的智能称重仪表的研究

本文率先在SOC片上采用RTX51嵌入式实时操作系统开发智能称重仪表，采用先进的∑-△数据转换技术和数字滤波算法达到精度及实时性的要求。重点阐述了如何在RTX51操作系统下进行软件任务的划分，并介绍了本系统相关的硬件设计。     

智能称重仪表的设计及应用

传统称重仪表受制于硬件性能与价格因素等的影响,发展已经到了瓶颈期,智能称重仪表逐渐成为趋势。本文针对智能称重仪表的选型、开发和功能,采取分类对比、功能需求分析等方法,对智能称重仪表的设计提出了一种解决思路。     

称重仪表输入信号浅析

本文针对电子称重仪表检测过程中出现的问题,进行了分析,提出称重仪表输入信号提法比输入信号电压合适,并对检测称重仪表使用的传感器模拟器提出了要求,提出了制订称重仪表检测规范的必要性。     

用触摸屏大字号实时显示称重仪表的数据

为满足工厂远距离实时直观地看到称重仪表上的称重信息,该文开发设计了用触摸屏大字号实时显示称重仪表上的数据的系统。系统由触摸屏、称重仪表、称重传感器、220 V交流电源、24 V直流电源以及通信线组成,无需使用PLC设备,通过对触摸屏编写程序,能够实现称重仪表数据信息经过触摸屏加工处理、转换后在触摸屏上以大字号实时显示,实现与称重仪表数据的同步。实际应用表明系统具有同步性好、稳定可靠、使用方便的特点。     

称重测力及仪表学术讨论会和展览会

中国仪器仪表学会过程检测控制仪表学会将于1985年10月下旬召开称重测力及仪表学术讨论会和展览会。征集论文的范围如下:(1)称重测力及仪表的基础理论,(2)称重测力传感器及仪表的研究、开发和应用,(3)新型称重仪表(动态电子皮带秤,轨道衡,料斗秤,平     

称重仪表在球团工序中的应用

全面论述了冶金行业称重仪表的分类、选型依据、安装要求以及标定方法等。详细介绍了各种称重仪表在钢铁厂球团工序中的应用,并阐述了当前称重仪表的应用现状和技术瓶颈,预测了其未来发展的趋势。     

国内称重仪表的应用现状及发展趋势

称重仪表是多种技术的集合。在现阶段,我国的称重仪表水平与国外还有较大差距。随着相关技术的日新月异,称重仪表展现出高稳定性、智能化、网络化、微型化和模块化的发展趋势。     

基于PROFIBUS-DP称重仪表的设计

本文阐述了基于PROFIBUS-DP通信称重仪表的设计方法,通过SPC3集成电路使称重仪表实现了与主站的通信,完成通信协议的转换。     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.