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飞机供电适应性测试电源的程控设计与实现
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作者 王赛 王雨龙 +2 位作者 司剑飞 袁龙 孟欣 《计量与测试技术》 2023年第4期49-52,共4页
本文针对目前飞机供电适应性测试电源研究存在的标准不清晰、需求不明确、使用不方便、方法不高效的问题,通过分析飞机供电特性和供电适应性标准,对供电适应性测试电源需求进行梳理,并对测试电源进行程控设计和实验验证,解决了测试电源... 本文针对目前飞机供电适应性测试电源研究存在的标准不清晰、需求不明确、使用不方便、方法不高效的问题,通过分析飞机供电特性和供电适应性标准,对供电适应性测试电源需求进行梳理,并对测试电源进行程控设计和实验验证,解决了测试电源效率低、准确性差等问题,推动了飞机供电适应性测试的科学高效开展。 展开更多
关键词 飞机供电特性 供电适应性测试电源 程控设计
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FY-3A太阳辐射监测仪的程控设计与实现 被引量:10
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作者 弓成虎 方伟 《光学精密工程》 EI CAS CSCD 北大核心 2010年第7期1476-1482,共7页
介绍了载于FY-3A气象卫星用来监测太阳辐照度变化的太阳辐射监测仪(SIM)的工作原理,描述了该监测仪的系统组成和工作模式。SIM由3台相同的太阳辐照绝对辐射计(SIAR)按一定角度排列构成测量三通道,3个通道可单独或同时进行测量,对获得的... 介绍了载于FY-3A气象卫星用来监测太阳辐照度变化的太阳辐射监测仪(SIM)的工作原理,描述了该监测仪的系统组成和工作模式。SIM由3台相同的太阳辐照绝对辐射计(SIAR)按一定角度排列构成测量三通道,3个通道可单独或同时进行测量,对获得的数据进行对比、查验和校正。分别介绍了太阳辐射监测仪的3种工作模式,即通道自测模式、太阳辐射测量模式和冷空间测量模式,在此基础上对其执行的在轨运行任务进行了分析说明。讨论了程控设计要点与实现,给出了SIM采用各测量模式获得的遥感数据。FY-3A太阳辐射监测仪从2008年6月开始执行在轨测量,得到的实验结果表明,设计的测量模式合理,运控参数有效,全部软件功能均已实现,测量得到的太阳辐照度与同国际同期卫星SORCE/TIM的测量数据在0.2%以内相符。 展开更多
关键词 FY-3A卫星 太阳辐射监测仪 太阳辐照绝对辐射计 程控设计
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基于SFC的输煤系统程控设计 被引量:1
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作者 刘燕平 《电力科学与工程》 2003年第2期68-69,共2页
介绍顺序功能图SFC(顺序功能图)法的原理及应用,列举该方法的一些典型应用,给出了所设计系统的控制要求、状态转移图和梯形图,并对它们各自的优点和不足进行比较。最后采用F1系列的可编程序控制器实现输煤系统皮带运输机的编程设计,对P... 介绍顺序功能图SFC(顺序功能图)法的原理及应用,列举该方法的一些典型应用,给出了所设计系统的控制要求、状态转移图和梯形图,并对它们各自的优点和不足进行比较。最后采用F1系列的可编程序控制器实现输煤系统皮带运输机的编程设计,对PLC(可编程序控制器)控制系统的设计有一定的指导意义。 展开更多
关键词 输煤系统 程控设计 SFC 顺序功能图 可编程序控制器 火力发电厂 热电厂
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化学水程控设计中的迂回回路分析
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作者 许继刚 《华北电力技术》 CAS 北大核心 1993年第4期48-49,58,共3页
1 回路简介某燃煤电厂化学补给水处理系统为一级除盐加混床。一期工程安装两列,扩建时安装一列,整个系统的运行和控制方式为:一级除盐部分采用程序控制,澄清池采用就地控制,混床及其它均采用远方操作。一期工程两台混床并联运行。
关键词 化学补给水 程控设计 迂回回路
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某热电厂水网程控设计
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作者 林建勇 《电力学报》 2006年第4期470-472,476,共4页
详细介绍了蒙南热电厂2×60MW机组水网程控采用PLC完成控制功能的设计方案,以及本工程的工艺系统概述、控制系统结构特点、设备选型原则等,并对在设计、施工过程中出现的问题提出了解决建议,总结了本工程的设计、施工经验。
关键词 热电厂 水网 程控设计 PLC
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程控设计中易犯的典型错误
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作者 张益民 田兴东 《工程建设与设计》 2012年第4期187-189,共3页
分析了PLC程序设计中常见的常开触点与常闭触点分不清、使用不当的问题。并介绍了如何避免这一问题的办法,对解决类似问题提出了启示。
关键词 PLC程控设计 常开触点 常闭触点
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数控机床程控多工位自适应夹具的开发及应用分析
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作者 唐亚华 《中国设备工程》 2016年第13期86-86,88,共2页
在数控机床成孔设计中,技术人员应该从机床设备的配套设计出发,确保夹具装备与机床完整配套.使用三爪卡盘夹具装备进行车床设备的固定配置,能够提高数控机床的稳定性.为了提高数控机床夹具的自适应性,技术人员应该采取综合误差补偿技术... 在数控机床成孔设计中,技术人员应该从机床设备的配套设计出发,确保夹具装备与机床完整配套.使用三爪卡盘夹具装备进行车床设备的固定配置,能够提高数控机床的稳定性.为了提高数控机床夹具的自适应性,技术人员应该采取综合误差补偿技术,提高机床生产效率.在数控机床功能性开发的过程中,技术人员应该积极引进先进的生产技术,本文提出几点有利于夹具适应效果提高的可行性措施. 展开更多
关键词 数控机床 程控设计 自适应 夹具应用
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PLC装置在电厂输煤监控系统中的应用 被引量:2
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作者 李雪珍 李波勇 艾贤成 《长沙电力学院学报(自然科学版)》 2004年第1期47-50,共4页
将SIEMENSS7-200型PLC装置应用于湖南鲤鱼江电厂输煤系统的联锁程控设计中,能够可靠、准确地完成输煤控制操作,实时监测和记录输煤过程运行状况,并能对现场出现的各种突发事件及时做出响应,效果良好.
关键词 PLC装置 电厂 煤炭输送 监控系统 联锁程控设计 可编程控制器
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Implementation of a new PC based controller for a PUMA robot 被引量:2
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作者 FAROOQ M. 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第12期1962-1970,共9页
This paper describes the replacement of a controller for a programmable universal machine for assembly (PUMA) 512 robot with a newly designed PC based (open architecture) controller employing a real-time direct contro... This paper describes the replacement of a controller for a programmable universal machine for assembly (PUMA) 512 robot with a newly designed PC based (open architecture) controller employing a real-time direct control of six joints. The original structure of the PUMA robot is retained. The hardware of the new controller includes such in-house designed parts as pulse width modulation (PWM) amplifiers, digital and analog controllers, I/O cards, signal conditioner cards, and 16-bit A/D and D/A boards. An Intel Pentium IV industrial computer is used as the central controller. The control software is implemented using VC++ programming language. The trajectory tracking performance of all six joints is tested at varying velocities. Experimental results show that it is feasible to implement the suggested open architecture platform for PUMA 500 series robots through the software routines running on a PC. By assembling controller from off-the-shell hardware and software components, the benefits of reduced and improved robustness have been realized. 展开更多
关键词 Programmable universal machine for assembly (PUMA) robot Computed torque control (CTC) Pulse width modulation (PWM) amplifier Graphical user interface (GUI)
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Design of Remote Control Nuclear Radiation Detector 被引量:1
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作者 郭银景 李瑾 丁晓明 《Journal of Measurement Science and Instrumentation》 CAS 2011年第4期390-393,共4页
For the issue of nuclear radiation detection,this paper designs a remote control nuclear radiation detector which can trace a pre-determined route,avoid obstacles effectively,and can be controlled remotely by users wi... For the issue of nuclear radiation detection,this paper designs a remote control nuclear radiation detector which can trace a pre-determined route,avoid obstacles effectively,and can be controlled remotely by users wirelessly or through voice command.It can effectively replace manual probing due to convenience,flexibility and safety.The system mainly consists of a nuclear detection module,a voice control module,a route tracing module,an obstacle avoidance module,a data transmission module,storage and a display module,and a D.C.machine.An MSP430 microcontroller is used as a control chip to control the motor and the system uses infrared technology and ultrasonic sensors to achieve intelligent tracing and obstacle avoidance.Moreover,it applies a voice module and data transmission module to remotely controlling the device.The radiation data is shown on an LCD screen. 展开更多
关键词 nuclear detection voice remote control wirelessremote control tracing and obstacle avoidance
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Cascade control based on minimum sensitivity in outer loop for processes with time delay 被引量:6
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作者 尹成强 惠鸿忠 +2 位作者 岳继光 高洁 郑丽萍 《Journal of Central South University》 SCIE EI CAS 2012年第9期2689-2696,共8页
A new cascade control program was proposed based on modified internal model control to handle stable,unstable and integrating processes with time delay.The program had totally four controllers of which the secondary l... A new cascade control program was proposed based on modified internal model control to handle stable,unstable and integrating processes with time delay.The program had totally four controllers of which the secondary loop had two controllers and the primary loop had two controllers.The two secondary loop controllers were designed using IMC technique.They were decoupled completely and could be adjusted independently,which avoided the undesirable influence on performance of the primary controllers.The main controller in the primary loop was devised as a PID using the method of minimum sensitivity,which could guarantee not only the nominal performance but also the robust stability of the system.A setpoint filter was added in the primary loop to improve the tracking performance.All the controllers of the two closed-loops were designed analytically,and could be adjusted and optimized by single parameter respectively.Simulations were carried out on three various processes with time delay,and the results show that the proposed method can provide a better performance of both set-point tracking and disturbance rejection and robustness against parameters perturbation. 展开更多
关键词 cascade control time delay H∞ performance specification modified internal mode control multiple degrees of freedom
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Partially Decentralized Controller Design via Model Predictive Control 被引量:1
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作者 郝玉春 李强 +1 位作者 谭文 李东海 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2012年第6期1094-1101,共8页
An expansion procedure to design partially decentralized controllers via model predictive control is proposed in this paper. Partially decentralized control is a control structure that lies between a fully decentraliz... An expansion procedure to design partially decentralized controllers via model predictive control is proposed in this paper. Partially decentralized control is a control structure that lies between a fully decentralized structure and a fully centralized one, and has the advantage of achieving comparable performance as a fully centralized controller but with simpler structure. The proposed method follows the expansion method proposed in a previous paper where internal model control (IMC) was used to design controllers for non-square subsystems. The method requires computing the pseudo-inverse of a non-square matrix via pseudo-inverse factors. Instead, the proposed method uses dynamic matrix control (DMC) to design PID controllers for non-square subsystems without using additional factors. The effectiveness of the proposed method is demonstrated on several chemical examples. Simulation results show that the proposed method is simple and can achieve better performance. 展开更多
关键词 partially decentralized control non-square system model predictive control internal model control
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An ECN-based Optimal Flow Control Algorithm for the Internet
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作者 张敬辕 XieJianying 《High Technology Letters》 EI CAS 2002年第2期87-91,共5页
According to the Wide Area Network model, we formulate Internet flow control as a constrained convex programming problem, where the objective is to maximize the total utility of all sources over their transmission rat... According to the Wide Area Network model, we formulate Internet flow control as a constrained convex programming problem, where the objective is to maximize the total utility of all sources over their transmission rates. Based on this formulation, flow control can be converted to a normal unconstrained optimization problem through the barrier function method, so that it can be solved by means of a gradient projection algorithm with properly rate iterations. We prove that the algorithm converges to the global optimal point, which is also a stable proportional fair rate allocation point, provided that the step size is properly chosen. The main difficulty facing the realization of iteration algorithm is the distributed computation of congestion measure. Fortunately, Explicit Congestion Notification (ECN) is likely to be used to improve the performance of TCP in the near future. By using ECN, it is possible to realize the iteration algorithm in IP networks. Our algorithm is divided into two parts, algorithms in the router and in the source. The router marks the ECN bit with a probability that varies as its buffer occupancy varies, so that the congestion measure of links can be communicated to the source when the marked ECN bits are reflected back from its destination. Source rates are then updated by all sessions according to the received congestion measure. The main advantage of our scheme is its fast convergence ability and robustness; it can also provide the network with zero packet loss by properly choosing the queue threshold and provide differentiated service to users by applying different utility functions. 展开更多
关键词 flow control Explicit Congestion Notification convex programming INTERNET
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Stone Columns and Tensioned Anchors to Completely Eliminate Tunnels Trough Settlements
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作者 Ampeglio Diego Garini 《Journal of Civil Engineering and Architecture》 2015年第10期1202-1209,共8页
The complex tunnelling constructive environment in urban area in similar green field situations is faced through analytical evaluations in order to control the design calculation process and subsequently manage the in... The complex tunnelling constructive environment in urban area in similar green field situations is faced through analytical evaluations in order to control the design calculation process and subsequently manage the interventions techniques with the aim of totally reducing the typical settlements trough above the tunnel either during the construction stage or during the serviceability stage. Recently, the author has proposed an operative and mathematical method by an opportune choice of tensioned anchors to control the tunnel lining settlements. In order to completely eliminate the remainder typical soft soil trough which is normal to the line of the tunnel, it is here proposed to use and properly calculate the interventions of stone columns by the SAVE (silent, advanced, vibration-erasing) Compozer method, in combination with the anchorages. 展开更多
关键词 ANCHORAGES SAVE Compozer method stone columns tunnel lining tunnel trough.
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Team-oriented programming for multiple mobile robots
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作者 孙波 Chen Weidong Xi Yugeng 《High Technology Letters》 EI CAS 2005年第4期410-414,共5页
This paper presnts a team-oriented programming method specially designed for multiple mobile robots. The team, which is a typical constitution structure in multi-robot system, forms after the user selects suitable rob... This paper presnts a team-oriented programming method specially designed for multiple mobile robots. The team, which is a typical constitution structure in multi-robot system, forms after the user selects suitable robots, assigns their roles and sets related parameters. Team behavior module are introduced for the team-level behavior description and the temporal chain of these modules, realized by finite state automata, partitions the team tasks into discrete operating states and triggers. A graphical programming tool is designed for the team task description with visual diagrams. The real robots experiment of adaptive formation shows the system's usability and effectivity. 展开更多
关键词 MULTI-ROBOT mobile robots team-oriented programming
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Horizontal roof gap of backfill hydraulic support 被引量:4
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作者 张强 张吉雄 +2 位作者 邰阳 方坤 殷伟 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3544-3555,共12页
For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body&#... For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body's compression ratio. Horizontal roof gap, as a key parameter of backfilling characteristics, may impact the backfilling effect from the aspects of control of roof subsidence in advance, support stress, backfilling process and the support design. Firstly, the reason why horizontal roof gap exists was analyzed and its definition, causes and connotation were introduced, then adopting the Pro/E 3D simulation software, three typical 3D entity models of backfill hydraulic supports were built, based on the influence of horizontal roof gap on backfilling effect, and influence rules of four factors, i.e. support height, suspension height, suspension angle and tamping angle, were emphatically analyzed on horizontal roof gap. The results indicate that, the four factors all have significant impacts on horizontal roof gap, but show differences in influence trend and degree, showing negative linear correlation, positive linear correlation, positive semi-parabolic correlation and negative semi-parabolic correlation, respectively. Four legs type is the most adaptive to the four factors, while six legs(II) type has the poorest adaptability, and the horizontal roof gap is small under large support height, small suspension height, small suspension angle and large tamping angle situation. By means of optimizing structure components and their positional relation and suspension height of backfill scrape conveyor in the process of support design and through controlling working face deployment, roof subsidence in advance, mining height and backfilling during engineering application, the horizontal roof gap is optimized. The research results can be served as theoretical basis for support design and guidance for backfill support to have better performance in backfilling. 展开更多
关键词 horizontal roof gap backfill hydraulic support support height suspension height suspension angle tamping angle
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Design and Analysis of Integrated Predictive Iterative Learning Control for Batch Process Based on Two-dimensional System Theory 被引量:3
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作者 陈宸 熊智华 钟宜生 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第7期762-768,共7页
Based on the two-dimensional (2D) system theory, an integrated predictive iterative learning control (2D-IPILC) strategy for batch processes is presented. First, the output response and the error transition model ... Based on the two-dimensional (2D) system theory, an integrated predictive iterative learning control (2D-IPILC) strategy for batch processes is presented. First, the output response and the error transition model predictions along the batch index can be calculated analytically due to the 2D Roesser model of the batch process. Then, an integrated framework of combining iterative learning control (ILC) and model predictive control (MPC) is formed reasonably. The output of feedforward ILC is estimated on the basis of the predefined process 2D model. By min- imizing a quadratic objective function, the feedback MPC is introduced to obtain better control performance for tracking problem of batch processes. Simulations on a typical batch reactor demonstrate that the satisfactory tracking performance as well as faster convergence speed can be achieved than traditional proportion type (P- t-we) ILC despite the model error and disturbances. 展开更多
关键词 lterative learning control Model predictive control Integrated control Batch process Two-dimensional systems
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Robust Non-fragile PID Controller Design for the Stroke Regulation of Metering Pumps 被引量:3
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作者 余世明 吴江江 张端 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2011年第1期83-88,共6页
This job focuses on the stroke regulation of a class of high-precision metering pumps.A parametertuning method of robust non-fragile PID(proportional-integral-derivative)controllers is proposed with the assumption t... This job focuses on the stroke regulation of a class of high-precision metering pumps.A parametertuning method of robust non-fragile PID(proportional-integral-derivative)controllers is proposed with the assumption that a PID controller has additive gain perturbations.An H-infinite robust PID controller can be obtained by solving a linear matrix inequality.This approach can guarantee that the closed-loop control systems is asymptotically stable and the H-infinite norm of the transfer function from the disturbance to the output of a controlled system is less than a given constant to attenuate disturbances.The simulation case shows that the control performance of the proposed strategy is significantly better than the traditional PID approach in the situation with perturbations of controller parameters. 展开更多
关键词 metering pump stroke regulation H-infinite robust control PID control NON-FRAGILE
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Evolution of Building Envelopes through Creating Living Characteristics
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作者 Elaheh Najafi Mohsen Faizi 《Journal of Civil Engineering and Architecture》 2017年第12期1086-1102,共17页
Building envelopes include facades and roof, which have the most interaction and exchange with outside and natural environment. In the future, meeting buildings various complicated needs with new technological advance... Building envelopes include facades and roof, which have the most interaction and exchange with outside and natural environment. In the future, meeting buildings various complicated needs with new technological advances necessitates a change and evolution in building envelopes. Controlling the energy consumption of the buildings is mostly through controlling the energy performance of the building envelopes. New technologies lead to the intelligent facades and envelopes. The envelope can be designed to be a part of the whole building's metabolism (energy production, storage and consumption) and morphology. The envelope would be a controlled part of the building which is managed through the central control system of the building, which connects it to other parts. It caused building envelope design to be changed fundamentally, so that there is a need to interact with engineering disciplines including computer engineering, mechanical engineering, material engineering and so on. All of these caused building envelope to get closer to biological and living systems. The physical restrictions which affect buildings system and living systems are the same. So they cause the same forces to shape the structure and form of the systems and the same rules to interact with the environment. The restrictions of material and energy resources caused living systems to be energy efficient and consuming less material. But the most important difference between living systems and building systems is in maximum use of different resources. As living systems use information maximally, the building system technology is based on using maximum energy. Now, there are many reasons and restrictions that building envelopes cannot act like living systems. But technological developments and contributing more disciplines in design and construction of building envelopes caused the future way of these envelopes get close to living systems for their energy efficiency. Some of living systems characteristics which the future building envelopes would have partially or benefit for the design process or construction are self-organization, evolution principles, hierarchical levels, processing energy, reaction to environmental stimuli and self-adjustment. Self-organization is achieved in some design software and in building material production for creating formal patterns. Evolution principles provide infrastructure for soft wares for optimization purposes and form creation. Hierarchical levels refer to giving hierarchical structure to the building envelopes through layering and designing different scales. Processing energy (metabolism) would be achieved through photovoltaic and solar collectors to produce energy and in passive systems for energy storage and distribution. Controlling solar radiation absorption and transmittance would help energy transfer from outside to building and vice versa. Reaction to environmental stimuli which is one of the most important characteristics of future building envelopes would use different types of active and passive sensors to create envelope mechanical reactions through material properties or collect data for processing in the control center to determine the right reaction. The reaction would be through different strategies such as changing properties and moving. Reaction could be passive or active. Self-adjustment can be achieved by control systems and processing units. All of these mean intelligent envelopes are essential parts of future buildings. Though it is now started with new design soft wares based on biological principles to optimize different parameters affecting the envelope function or to create the most efficient form. 展开更多
关键词 Intelligent envelopes living systems new technologies environmentally respondent energy consumption.
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Simulation and Design of Fuzzy Sliding-mode Controller for Ship Heading-tracking 被引量:3
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作者 袁雷 吴汉松 《Journal of Marine Science and Application》 2011年第1期76-81,共6页
In considering the characteristic of a rudder,the maneuvers of a ship were described by an unmatched uncertain nonlinear mathematic model with unknown virtual control coefficient and parameter uncertainties.In order t... In considering the characteristic of a rudder,the maneuvers of a ship were described by an unmatched uncertain nonlinear mathematic model with unknown virtual control coefficient and parameter uncertainties.In order to solve the uncertainties in the ship heading control,specifically the controller singular and paramount re-estimation problem,a new multiple sliding-mode adaptive fuzzy control algorithm was proposed by combining Nussbaum gain technology,the approximation property of fuzzy logic systems,and a multiple sliding-mode control algorithm.Based on the Lyapunov function,it was proven in theory that the controller made all signals in the nonlinear system of unmatched uncertain ship motion uniformly bounded,with tracking errors converging to zero.Simulation results show that the demonstrated controller design can track a desired course fast and accurately.It also exhibits strong robustness peculiarity in relation to system uncertainties and disturbances. 展开更多
关键词 ship autopilot nonlinear system unmatched uncertainty multiple sliding mode control fuzzy control
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