PCM-3718HG采样板在调容式消弧线圈自动跟踪补偿装置中的应用

PCM 3718HG采样板具有模拟信号采集和数字信号控制功能,能够方便地实现采样计算和对外部设备的控制,是调容式消弧线圈自动跟踪补偿装置的重要纽带。介绍了装置的结构与功能,以及电容电流的跟踪测量方法。并结合自动装置,重点阐述了PCM 3718HG采样板在其中的实际应用。通过实际运行证明,装置很好地实现了精确跟踪和快速补偿功能。     

一种Hawk仪器输出地震数据转储的方法

本文提出一种在Hawk仪器Transcriber系统中,外接安装有地震数据转储专用软件的计算机,在一定程度上能够提高和改善Hawk仪器Transcriber系统的数据转储效率,对Hawk仪器在大规模的数据采集应用时有一定的参考价值。     

核电站堆外核测量系统的原理及工程实践

介绍了堆外核测量系统的原理和组成,比较了AP1000与二代加改进型压水堆核电站堆外核测量系统的异同,分析了各自的优缺点,并提出了堆外核测量系统的一个发展方向。     

Generalized eigenvalue minimization for uncertain first-order plus time-delay processes

This paper shows how to apply generalized eigenvalue minimization to processes that can be described by a first-order plus time-delay model with uncertain gain, time constant and delay. An algorithm to transform the uncertain first-order plus time delay model into a state-space model with uncertainty polyhedron is firstly described. The accuracy of the transformation is studied using numerical examples. Then, the uncertainty polyhedron is rewritten as a linear-matrix-inequality constraint and generalized eigenvalue minimization is adopted to calculate a feedback control law. Case studies show that even if uncertainties associated with the first-order plus time delay model are significant, a stable feedback control law can be found. The proposed control is tested by comparing with a robust internal model control. It is also tested by applying it to the temperature control of air-handing units.     

Hydrogen production potential from agricultural biomass in Punjab province of Pakistan

Depleting resources and popping environmental concerns instigate the development of sustainable and clean energy solutions. Amongst others, Hydrogen (H₂) is an imperious alternative due to the lowest emissions, higher calorific value, and usability. It has great relevance in Pakistan due to sequester Agricultural biomass potential that can be used as feedstock for H₂ production. So, this study estimates the H₂ production potential from agricultural biomass (rice, sugarcane, cotton, wheat, and maize) of Punjab, Pakistan. In doing so, simulations are performed using Aspen Plus under various conditions to derive an optimal value of H₂ output. The results indicate significant heterogeneity across districts and crop residues types. Therefore, the Geographic Information System (GIS) is used to draw the spatial distribution of optimal H₂ production across crops and districts. The simulated results reveal that Punjab province has the potential to produce 2619.90 × 10³ Metric tons (MT)/year H_2, and the highest potential derives from sugarcane trash (1012.77 × 10³ MT/year), followed by maize straw (433.67 × 10³ MT/year). The estimated H₂ potential (2.62 million MT/year) can be used in industries, transportation, and urea production as a sustainable alternative in Pakistan.     

Comparison study on different ITM‐integrated MCFC hybrid systems with CO2 recovery using sweep gas

Previous study shows the ITM (oxygen ion transfer membrane)‐integrated MCFC (molten carbonate fuel cell) hybrid system with CO₂ recovery can maintain high efficiency; however, the oxygen partial pressure on the ITM permeate side is usually 1 atm, which requires a very high pressure ratio of the ITM air compressor in order to separate the oxygen; using the sweep gas can solve this problem. In this paper the ITM‐integrated MCFC hybrid systems with CO₂ recovery using different sweep gases are studied. With the Aspen plus software, two systems with different sweep gases are established, and their performances are compared with the benchmark system without sweep gas; the effects of key parameters on the optimum system performance are also investigated. Results show that compared with the benchmark system, the efficiencies of the systems with sweep gases are increased and the pressure ratios of the air compressors are decreased; the system using pure CO₂ as sweep gas can improve the system efficiency by 1.25%, which is superior to the system using the mixture gas of CO₂ and H₂O as sweep gas. Achievements from this paper will provide a valuable reference for CO₂ recovery from the MCFC hybrid power system with lower energy consumption. Copyright © 2016 John Wiley & Sons, Ltd.     

Predictive IP controller for robust position control of linear servo system

Position control is a typical application of linear servo system. In this paper, to reduce the system overshoot, an integral plus proportional (IP) controller is used in the position control implementation. To further improve the control performance, a gain-tuning IP controller based on a generalized predictive control (GPC) law is proposed. Firstly, to represent the dynamics of the position loop, a second-order linear model is used and its model parameters are estimated on-line by using a recursive least squares method. Secondly, based on the GPC law, an optimal control sequence is obtained by using receding horizon, then directly supplies the IP controller with the corresponding control parameters in the real operations. Finally, simulation and experimental results are presented to show the efficiency of proposed scheme.     

一种应用于列车信息画面实时重建的快速绘图方法

在许多视频应用中,画面重建是一个重要的课题。提出一种应用于列车信息实时分析重建系统的快速绘图方法使用双缓存技术在内存空间申请指定大小的位图,通过图形设备接口在该位图上进行图形绘制。绘图模块对基本绘图单元进行封装,各绘图元素单元具有相似的设置接口。采用了双缓冲技术避免闪烁,同时采用部分绘制方法,提高绘制速度。该绘图模块具有很好的可扩展性、实时性和灵活性。所提出的快速绘图方法在列车信息实时分析重建系统中得到很好的应用。     

浅析建筑工程不同计价合同的风险分担

本文对工程建设合同的类型进行了简单的描述,阐述了工程合同进行风险管理的依据,通过合同类型的定义对固定总价合同、单价合同和成本加酬金合同进行了辨析,得出在三种不同的计价合同下业主和承包商的风险分担,并在风险承担者、对工程的管理、工程变更的可能性、对工程结算的难易等方面对固定总价和、单价合同和成本加酬金合同三种计价合同进行阐述并给出了各自的应用范围。     

基于双控制器的一类积分纯滞后系统的研究

针对一类积分加纯滞后系统,在常规Smith预估控制器的基础上采取了一种双控制器结构,实现了系统的目标值跟踪特性和干扰抑制特性分离.这种控制器结构简单,可调参数少,参数的调节方便,直观.仿真结果表明:在干扰和模型失配的情况下,此类控制器仍然具有良好的控制性能和鲁棒稳定性能.