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交通事故再现碰撞模型抗扰力的分析方法 被引量:2
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作者 张健 景宪光 +2 位作者 刘段清 蒙彦宇 杨帆 《北华大学学报(自然科学版)》 CAS 2007年第4期355-361,共7页
基于摄动理论,应用3种常用的数学方法对汽车碰撞事故再现模型的抗扰力进行了分析.结果表明:对于特定模型在复杂的扰动条件下,采用不同的数学方法处理效果截然不同.通过理论分析,给出了解决此类问题的方法,给出了数学表达式.
关键词 抗扰力分析方法 汽车碰撞事故模型 条件数
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火电厂给煤机变频器电压暂降抗扰力 被引量:8
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作者 邵文权 王龙 +2 位作者 王建波 吴波 杨亚鹏 《电力建设》 北大核心 2015年第3期88-93,共6页
随着火电厂辅机系统变频器的大规模使用,电网电压暂降引起大量火电机组跳闸的问题凸显。结合陕西电网典型火电机组给煤机变频器低电压穿越特性试验现场试验数据,系统地分析了电压暂降主要因素对变频器输出特性的影响,提出采用动态电压... 随着火电厂辅机系统变频器的大规模使用,电网电压暂降引起大量火电机组跳闸的问题凸显。结合陕西电网典型火电机组给煤机变频器低电压穿越特性试验现场试验数据,系统地分析了电压暂降主要因素对变频器输出特性的影响,提出采用动态电压恢复器(dynamic voltage restorer,DVR)进行电压暂降快速补偿的方案。电网电压暂降深度、电压暂降持续时间、负载大小、电压暂降类型等因素对火电机组给煤机变频器工作特性影响较大,导致电压敏感设备变频器直流工作电压降低超限甚至失压,进而引发变频器工作回路动作跳闸退出运行。利用PSCAD/EMTDC搭建典型的变频器电压暂降实验及补偿模型,结果表明采用动态电压恢复器能够很好的稳定变频器直流工作电压,有利于提高变频器电压暂降抗扰能力。 展开更多
关键词 电压暂降 变频器 抗扰力 动态电压恢复器(DVR)
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一种具有抗干扰能力的 Smith 预估控制系统
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作者 彭宇宁 《工业仪表与自动化装置》 1998年第4期17-20,共4页
本文针对Smith预估控制系统抗干扰能力差的问题,探讨运用前馈控制与Smith预估控制结合的方法,提高系统的抗扰力,改善控制品质。
关键词 抗扰力 SMITH预估控制 前馈控制 控制系统
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论数字控制系统中采样频率的选定 被引量:4
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作者 吕小云 崔作龙 +2 位作者 王军 杜晓东 杨国仁 《甘肃科学学报》 2001年第3期83-87,共5页
合理选择采样频率是设计实时数字控制系统遇到的实际问题。而采样频率的选定是实现高精度、良好指标和具备较强抗扰力控制的关键所在 。
关键词 数字控制系统 采样频率 香农采样定理 系统字长 动态期望性能 抗扰力控制
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Tension Active Disturbance Rejection Control of Automatic Yarn Splicing Robots for Ring Spinning
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作者 WANG Lisu CAI Yun +1 位作者 JI Cheng WANG Junliang 《Journal of Donghua University(English Edition)》 CAS 2024年第5期505-512,共8页
Automatic splicing of interrupted yarns in ring spinning has always been a problem in the industry.Factors such as low yarn strengths and environmental influence on yarn tensions make it difficult to control the yarn ... Automatic splicing of interrupted yarns in ring spinning has always been a problem in the industry.Factors such as low yarn strengths and environmental influence on yarn tensions make it difficult to control the yarn tension during the robotic splicing process.The purpose of this research is to design active disturbance rejection control(ADRC)for a third-order nonlinear tension system subject to external disturbances.Firstly,a third-order extended state observer(ESO)is designed to achieve the suppression and the compensation of the internal modeling error and the external disturbances of the system.Secondly,the adaptive gain error feedback control and the filtering process are designed to reduce the influence of sensor noise on the disturbance observation.Finally,the tension control during the splicing process is simulated and experimented,and the experiments show that the method has good robustness in the tension tracking task under a dynamic environment,which verifies the effectiveness of the method. 展开更多
关键词 yarn splicing robot tension control active disturbance rejection control(ADRC) extended state observer(ESO)
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Application of pseudo-random frequency domain electromagnetic method in mining areas with strong interferences 被引量:7
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作者 Yan-fang HU Di-quan LI +2 位作者 Bo YUAN Guang-yun SUO Zi-jie LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期774-788,共15页
Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagneti... Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagnetic method(WFEM),in which the pseudo-random signal is taken as the transmitter source,can extract high quality resistivity data in areas with sever interference by only measuring the electric field component.We use the WFEM to extract the resistivity information of the Dongguashan mine in southeast China.Compared with the audio magnetotelluric(AMT)method,and the controlled source audio-frequency magnetotelluric(CSAMT) method,the WFEM can obtain data with higher quality and simpler operations.The inversion results indicate that the WFEM can accurately identify the location of the main ore-body,which can be used for deep mine exploration in areas with strong interference. 展开更多
关键词 pseudo-random signal frequency domain electromagnetic method wide field electromagnetic method(WFEM) strong interference anti-interference capability Dongguashan copper deposit
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In vitro resistance to interferon of hepatitis B virus with precore mutation 被引量:10
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作者 YanWang LaiWei DongJiang XuCong RanFei JiangXiao YuWang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2005年第5期649-655,共7页
AIM: Chronic hepatitis B virus (HBV) infection is predominantly treated with interferon alpha (IFN-α), which results in an efficient reduction of the viral load only in 20-40% of treated patients. Mutations at HBV pr... AIM: Chronic hepatitis B virus (HBV) infection is predominantly treated with interferon alpha (IFN-α), which results in an efficient reduction of the viral load only in 20-40% of treated patients. Mutations at HBV precore prevail in different clinical status of HBV infection. The roles of precore mutation in the progression of chronic hepatitis and interferon sensitivity are still unknown. The aim of this study was to explore if there was any relationship between HBV precore mutation and sensitivity to interferon in vitro. METHODS: HBV replication-competent recombinant constructs with different patterns of precore mutations were developed. Then the recombinants were transiently transfected into hepatoma cell line (Huh7) by calcium phosphate transfection method. With or without IFN, viral products in culture medium were collected and quantified 3 d after transfection. RESULTS: We obtained 4 recombinant constructs by orientation-cloning 1.2-fold-overlength HBV genome into pUC18 vector via the EcoRI and Hind lll and PCR mediated site-directed mutagenesis method. All the recombinants contained mutations within precore region. Huh7 cells transfected with recombinants secreted HBsAg and HBV particles into the cell culture medium, indicating that all the recombinants were replication-competent. By comparing the amount of HBV DNA in the medium, we found that HBV DNA in medium reflecting HBV replication efficiency was different in different recombinants. Recombinants containing precore mutation had fewer HBV DNAs in culture medium than wild type. This result: showed that recombinants containing precore mutation had lower replication efficiency than wild type. HBV DNA was decreased in pUC18-HBV1.2-WT recombinants after IFN was added while others with precore mutations were not, indicating that HBV harboring precore mutation was less sensitive to IFN in cell culture system. CONCLUSION: These data indicate that HBV harboring precore mutation may be resistant to IFN in vitro. 展开更多
关键词 Hepatitis B virus MUTATION INTERFERON Viral resistance
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A new PMSM speed modulation system with sliding mode based on active-disturbance-rejection control 被引量:12
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作者 荣智林 黄庆 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第6期1406-1415,共10页
A sliding mode and active disturbance rejection control(SM-ADRC)was employed to regulate the speed of a permanent magnet synchronous motor(PMSM).The major advantages of the proposed control scheme are that it can main... A sliding mode and active disturbance rejection control(SM-ADRC)was employed to regulate the speed of a permanent magnet synchronous motor(PMSM).The major advantages of the proposed control scheme are that it can maintain the original features of ADRC and make the parameters of ADRC transition smoothly.The proposed control scheme also ensures speed control accuracy and improves the robustness and anti-load disturbance ability of the system.Moreover,through the analysis of a d-axis current output equation,a novel current-loop SM-ADRC is presented to improve the system’s dynamic performance and inner ability of anti-load disturbance.Results of a simulation and experiments show that the improved sliding-mode ADRC system has the advantages of fast response,small overshoot,small steady-state error,wide speed range and high control accuracy.It shows that the system has strong anti-interference ability to reduce the influence of variations in rotational inertia,load and internal parameters. 展开更多
关键词 disturbance rejection auto tuning permanent magnet synchronous motor speed modulation system
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Technology of load-sensitivity used in the hydraulic system of an all-hydraulic core rig 被引量:6
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作者 XIN De-zhong CHEN Song-ling WANG Qing-feng 《Journal of Coal Science & Engineering(China)》 2009年第3期318-323,共6页
The existing hydraulic system always have problems of temperature rise,runningstability and anti-interference of the implementation components,reliability of hydrauliccomponents,maintenance difficulties,and other issu... The existing hydraulic system always have problems of temperature rise,runningstability and anti-interference of the implementation components,reliability of hydrauliccomponents,maintenance difficulties,and other issues.With high efficiency,energysaving,reliability,easy operating,stable running,anti-interference ability,and other advantages,the load-sensitive hydraulic system is more suitable for coal mine all-hydrauliccore rig.Therefore,for the technical development of the coal mine all-hydraulic core rig,the load-sensitive technology employed by the rig should be of great significance. 展开更多
关键词 all-hydraulic core rig load-sensitivity pressure constant contro
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Dynamic Positioning System Based on Active Disturbance Rejection Technology 被引量:3
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作者 LEI Zhengling GUO Chen FAN Yunsheng 《Journal of Ocean University of China》 SCIE CAS 2015年第4期636-644,共9页
A dynamically positioned vessel, by the International Maritime Organization (IMO) and the certifying class societies (DNV, ABS, LR, etc.), is defined as a vessel that maintains its position and heading (fixed loc... A dynamically positioned vessel, by the International Maritime Organization (IMO) and the certifying class societies (DNV, ABS, LR, etc.), is defined as a vessel that maintains its position and heading (fixed location or pre-determined track) exclu- sively by means of active thrusters. The development of control technology promotes the upgrading of dynamic positioning (DP) systems. Today there are two different DP systems solutions available on the market: DP system based on PID regulator and that based on model-based control. Both systems have limited disturbance rejection capability due to their design principle. In this paper, a new DP system solution is proposed based on Active Dis^n'bance Rejection Control (ADRC) technology. This technology is com- posed of Tracking-Differentiator (TD), Extended State Observer (ESO) and Nonlinear Feedback Combination. On one hand, both TD and ESO can act as filters and can be used in place of conventional filters; on the other hand, the total disturbance of the system can be estimated and compensated by ESO, which therefore enhances the system's disturbance rejection capability. This technology's advantages over other methods lie in two aspects: 1) This method itself can not only achieve control objectives but also filter noisy measurements without other specialized filters; 2) This method offers a new useful approach to suppress the ocean disturbance. The simulation results demonstrate the effectiveness of the proposed method. 展开更多
关键词 DP ADRC TD ESO disturbance rejection
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Adaptive PID control system for an autonomous underwater vehicle 被引量:5
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作者 王波 Su Yumin Wan Lei Sun Yushan 《High Technology Letters》 EI CAS 2011年第1期7-12,共6页
The control system of an autonomous underwater vehicle (AUV) is introduced. According to control requirements of the AUV, a simple but practical adaptive PID control method is designed The semi-physical simulation ... The control system of an autonomous underwater vehicle (AUV) is introduced. According to control requirements of the AUV, a simple but practical adaptive PID control method is designed The semi-physical simulation is done to test the feasibility of the control system. The neural network idea and the structure of PID controller are referred to design the adaptive PID controller. An intelligent integral is introduced to improve control precision. Compaed with traditional PID con- trollers, the adaptive PID controller has simple structure, good online adjusting ability, fast convergence and good robustness. The simulation experiments also show that the adaptive PID control system has high precision and fine antijamming ability. 展开更多
关键词 autonomous underwater vehicle AUV) control system adaptive PID control semi-physical simulation
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Design and Simulation of Single Neuron Adaptive PID Controller 被引量:3
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作者 徐振宇 孔维娜 《Journal of Measurement Science and Instrumentation》 CAS 2011年第2期188-190,共3页
The purpose of this paper is to design a neuron adaptive PID controller based on the theory of intelligent control of the extens- ive research on the characteristics of neuronss, neurons and PID controller. Artificial... The purpose of this paper is to design a neuron adaptive PID controller based on the theory of intelligent control of the extens- ive research on the characteristics of neuronss, neurons and PID controller. Artificial neurons have the adaptive, parallel processing, selflearning learning, and mare fault-tolerant characteristics. When the artificial neurons are used to control the process, the syste^n will enabled to en-sure that the accused has strong anti-interference capability and ro. bustness. 展开更多
关键词 PID control NEURON SELF-ADAPTATION
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A shaped annular beam tri-heterodyne confocal microscope with good anti-environmental interference capability 被引量:2
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作者 赵维谦 冯政德 邱丽荣 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第6期1624-1631,共8页
annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-fo... annular beam tri-heterodyne confocal microscope has been proposed to improve the anti-environmental interference capability and the resolution of a eonfoeal microscope. It simultaneously detects far-, on-, and near-focus signals with given phase differences by dividing the measured light path of the eonfoeal microscope into three sub-paths (signals). Pair-wise real-time heterodyne subtraction of the three signals is used to improve the anti-environmental interference capability, axial resolution, and linearity; and a shaped annular beam super-resolution technique is used to improve lateral resolution. Theoretical analyses and preliminary experiments indicate that an axial resolution of about 1 nm can be achieved with a shaped annular beam tri-heterodyne confoeal microscope and its lateral resolution can be better than 0.2 um for A = 632.8 nm, the numerical aperture of the lens of the microscope is NA = 0.85, and the normalized radius e = 0.5. 展开更多
关键词 confocal microscopy SUPER-RESOLUTION surface measurements
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Design of a modern automatic control system for the activated sludge process in wastewater treatment 被引量:2
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作者 Alexandros D.Kotzapetros Panayotis A.Paraskevas Athanasios S.Stasinakis 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第8期1340-1349,共10页
The Activated Sludge Process(ASP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times i... The Activated Sludge Process(ASP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times is a challenging matter. The proposed control method is an I-P modi fied controller automatic control system with state variable feedback and control canonical form simulation diagram for the process. A more stable response is achieved with this type of modern control. Settling times of 0.48 days are achieved for the concentration of microorganisms,(reference value step increase of 50 mg·L-1) and 0.01 days for the concentration of oxygen(reference value step increase of 0.1 mg·L-1). Fluctuations of concentrations of oxygen and microorganisms after an inlet disturbance of5 × 103m3·d-1are small. Changes in the reference values of oxygen and microorganisms(increases by 10%, 20% and 30%) show satisfactory response of the system in all cases. Changes in the value of inlet wastewater flow rate disturbance(increases by 10%, 25%, 50% and 100%) are stabilized by the control system in short time. Maximum percent overshoot is also taken in consideration in all cases and the largest value is 25% which is acceptable. The proposed method with I-P controller is better for disturbance rejection and process settling times compared to the same method using PI controller. This method can substitute optimal control systems in ASP. 展开更多
关键词 Activated sludge Modern automatic control PID controllers Root locus Waste treatment
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SOME BLIND FRESH EQUALIZATION ALGORITHMS WITH ANTI-INTERFERENCE CAPABILITIES
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作者 Zhou Ke Cao Shike Song Rongfang Zhang Lijun 《Journal of Electronics(China)》 2008年第6期768-773,共6页
Some novel blind FREquency-SHift (FRESH) equalizer algorithms are proposed for the equalization of Finite Impulse Response (FIR) single channel with anti-interference capabilities. These algorithms based on FRESH filt... Some novel blind FREquency-SHift (FRESH) equalizer algorithms are proposed for the equalization of Finite Impulse Response (FIR) single channel with anti-interference capabilities. These algorithms based on FRESH filter can work well without any training sequence. Simulation results show that the equalizer algorithms can effectively reject many types of interferences and the performances of these new equalizer algorithms are superior to the conventional equalizer algorithms. 展开更多
关键词 Blind equalization CYCLOSTATIONARITY FREquency-SHift (FRESH) filter
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Disturbance rejection control for Raymond mill grinding system based on disturbance observer
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作者 牛丹 陈夕松 +1 位作者 杨俊 周杏鹏 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第9期2019-2027,共9页
In the Raymond mill grinding processes,high-accuracy control for the current of Raymond mill is vital to enhance the product quality and production efficiency as well as cut down the consumption of spare parts.However... In the Raymond mill grinding processes,high-accuracy control for the current of Raymond mill is vital to enhance the product quality and production efficiency as well as cut down the consumption of spare parts.However,strong external disturbances,such as variations of ore hardness and ore size,always exist.It is not easy to make the current of Raymond mill constant due to these strong disturbances.Several control strategies have been proposed to control the grinding processes.However,most of them(such as PID and MPC)reject disturbances merely through feedback regulation and do not deal with the disturbances directly,which may lead to poor control performance when strong disturbances occur.To improve disturbance rejection performance,a control scheme based on PI and disturbance observer is proposed in this work.The scheme combines a feedforward compensation part based on disturbance observer and a feedback regulation part using PI.The test results illustrate that the proposed method can obtain remarkable superiority in disturbance rejection compared with PI method in the Raymond mill grinding processes. 展开更多
关键词 disturbance observer proportional integral-disturbance observer (PI-DOB) disturbance rejection Raymond mill grinding process
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Depth control for a deep-sea self-holding intelligent buoy system based on active disturbance rejection control method 被引量:1
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作者 QIU Zu-rong WANG Qiang +2 位作者 YANG Shao-bo LI Hong-yu LI Xing-fei 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第4期307-316,共10页
The net buoyancy of the deep-sea self-holding intelligent buoy(DSIB)will change with depth due to pressure hull deformation in the deep submergence process.The net buoyancy changes will affect the hovering performance... The net buoyancy of the deep-sea self-holding intelligent buoy(DSIB)will change with depth due to pressure hull deformation in the deep submergence process.The net buoyancy changes will affect the hovering performance of the DSIB.To make the DSIB have better resistance to the external disturbances caused by the net buoyancy and water resistance,a depth controller was designed to improve the depth positioning based on the active disturbance rejection control(ADRC).Firstly,a dynamic model was established based on the motion analysis of the DSIB.In addition,the extended state observer(ESO)and nonlinear state error feedback controller were designed based on the Lyapunov stability principle.Finally,semi-physical simulations for the depth control process were made by using the ADRC depth controller and traditional PID depth controller,respectively.The results of the semi-physical simulations indicate that the depth controller based on the ADRC can achieve the predefined depth control under the external disturbances.Compared with the traditional PID depth controller,the overshoot of the ADRC depth controller is 1.74%,and the depth error is within 0.5%.It not only has a better control capability to restrain the overshoot and shock caused by the external disturbances,but also can improve intelligence of the DSIB under the depth tracking task. 展开更多
关键词 deep-sea self-holding intelligent buoy(DSIB) active disturbance rejection control(ADRC) depth control buoyancy change pressure hull deformation
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Optimization design and analysis of Si-^(63)Ni betavoltaic battery 被引量:11
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作者 TANG XiaoBin DING Ding +1 位作者 LIU YunPeng CHEN Da 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第4期990-996,共7页
Among the various micro-powers being investigated, betavoltaic batteries are very attractive for numerous applications because of their advantages of high energy density, long life, strong anti-interference, and so on... Among the various micro-powers being investigated, betavoltaic batteries are very attractive for numerous applications because of their advantages of high energy density, long life, strong anti-interference, and so on. Based on the basic principle of the betavoltaic effect, the current paper adopted the Monte Carlo N-Particle code to simulate the transport processes of β particles in semiconductor materials and to establish the calculation formulas for nuclear radiation-generated current, open circuit voltage, and so on. By discussing the effect of minority carrier diffusion length, doping concentration, and junction depth on the property of batteries, the present work concluded that the best parameters for batteries are the use of silicon and the radioisotope Ni-63, i.e., Ni-63 with a mass thickness of 1 mg/cm2, Na=1×1019 cm-3, Nd=3.16×1016 cm-3, junction area of 1 cm2, junction depth of 0.3 μm, and so on. Under these parameters the short-circuit current, open circuit voltage, output power, and conversion efficiency are 573.3 nA, 0.253 V, 99.85 nW, and 4.94%, respectively. Such parameters are valuable for micro-power fields, such as micro-electromechanical systems and pacemakers, among others. 展开更多
关键词 betavoltaic semiconductor material radioisotope battery
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Navigation signal structure based on complex carrier modulation 被引量:3
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作者 XU Ying YUAN Hong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第6期1035-1045,共11页
Signal structure design is an important part of satellite navigation system research,which directly affects navigation performance.Signal performance parameters are analyzed and performances of BPSK modulated signals ... Signal structure design is an important part of satellite navigation system research,which directly affects navigation performance.Signal performance parameters are analyzed and performances of BPSK modulated signals and BOC modulated signals are compared.Aiming at requirements of high navigation precision and high anti-jamming ability,a new navigation signal structure based on complex carrier modulation is proposed and performances of the signal are researched with different parameters.A synchronization algorithm is put forward according to the signal characteristics,and the synchronization performance is qualitatively analyzed.Next,the applications of the complex carrier modulated signal are discussed,which include anti-jamming,navigation enhancement,power combing and so on.Simulations and analysis show that the proposed navigation signal structure based on complex carrier modulation has good navigation capabilities and anti-jamming abilities,which deserves further study. 展开更多
关键词 complex carrier modulation BPSK BOC root mean square bandwidth
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Optimization design of GaN betavoltaic microbattery 被引量:5
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作者 TANG XiaoBin LIU YunPeng +1 位作者 DING Ding CHEN Da 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第3期659-664,共6页
Betavoltaic radioisotope microbatteries have gradually become the research direction of micro-power sources because of their several advantages,including small scale,stable output performance,long service life,high en... Betavoltaic radioisotope microbatteries have gradually become the research direction of micro-power sources because of their several advantages,including small scale,stable output performance,long service life,high energy density,strong anti-jamming capability,and so on.Based on the theory of semiconductor physics,the current paper presented a design scheme of isotope microbattery with wide-gap semiconductor material GaN and isotope 147Pm.In consideration of the isotope's self-absorption effect,the current paper studied and analyzed the optimization thickness of semiconductor and isotope source,junction depth,depletion region thickness,doping concentration,and the generation and collection of electron hole pairs with simulation of transport process of beta particles in semiconductor material using Monte Carlo simulation program MCNP.In the proposed design scheme,for a single decay,an average energy of 28.2 keV was deposited in the GaN,and the short circuit current density,open circuit voltage,and efficiency of a single device were 1.636 μA/cm2,3.16 V,and 13.4%,respectively. 展开更多
关键词 GAN SEMICONDUCTOR isotope battery
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