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Comparison of the Satellite Attitude Control System Design using the H∞ Method and H∞/MLI with Pole Allocation Considering the Parametric Uncertainty 考虑参数不确定性的H∞方法与H∞/MLI极点配置卫星姿态控制系统设计比较
Pub Date : 2021-06-28 DOI: 10.37394/23201.2021.20.12
A. Souza, L. Souza
This paper presents the comparison of the Attitude Control System (ACS) design for a rigid-flexible satellite with two vibrations mode, using the traditional H∞method and the H∞/LMI with pole allocation considering the parametric uncertainty. In the ACS design is important take into account the influence of thestructure’s flexibility, since they can interact with the satellite rigid motion, mainly, during translational and/or rotational manoeuvrer, damaging the ACS. Usually the mathematics model obtained from the linearization and/or reduction of the rigid flexible model loses information about the flexible dynamical behaviour and introduces some uncertainty. The satellite model is represented by a flexible beam connected to a central rigid hub considering a setof parametric uncertainties. Simulations results have shown that the control law designed by the H∞/LMI method has better performance and it is more robust than H∞method since the first was able to support the action of the uncertainty perturbation and to control the rigid flexible satellite attitude and suppressing vibrations.
本文比较了考虑参数不确定性的刚柔卫星两种振动模式下,采用传统H∞方法和考虑极点配置的H∞/LMI方法进行姿态控制系统设计。在ACS设计中,考虑到结构灵活性的影响是很重要的,因为它们可以与卫星刚性运动相互作用,主要是在平移和/或旋转机动期间,破坏ACS。通常,通过对刚柔模型进行线性化或约简得到的数学模型会丢失有关柔性动力学行为的信息,并引入一些不确定性。考虑了一系列参数的不确定性,将卫星模型表示为连接在中心刚性轮毂上的柔性梁。仿真结果表明,采用H∞/LMI方法设计的控制律具有更好的性能,并且比H∞方法具有更强的鲁棒性,因为前者能够支持不确定性摄动的作用,能够控制刚柔卫星姿态并抑制振动。
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引用次数: 2
Random Access in IoT Using Naïve Bayes Classification 使用Naïve贝叶斯分类的物联网随机访问
Pub Date : 2021-05-28 DOI: 10.37394/23201.2021.20.10
Alhusein Almahjoub, D. Qiu
This paper deals with the random access procedure in next-generation networks and presents the solution to reduce total service time (TST) which is one of the most important performance metrics in current and future internet of things (IoT) based networks. The proposed solution focuses on the calculation of optimal transmission probability which maximizes the success probability and reduces TST. It uses the information of several idle preambles in every time slot, and based on it, it estimates the number of backlogged IoT devices using Naïve Bayes estimation which is a type of supervised learning in the machine learning domain. The estimation of backlogged devices is necessary since optimal transmission probability depends on it and the eNodeB does not have information about it. The simulations are carried out in MATLAB which verify that the proposed solution gives excellent performance.
本文研究了下一代网络中的随机访问过程,并提出了减少总服务时间(TST)的解决方案,TST是当前和未来基于物联网(IoT)的网络中最重要的性能指标之一。该方案侧重于计算最优传输概率,使传输成功率最大化,并降低TST。它使用每个时隙中几个空闲序数的信息,并在此基础上使用Naïve贝叶斯估计来估计积压的物联网设备的数量,这是机器学习领域中的一种监督学习。对积压设备的估计是必要的,因为最优传输概率取决于它,而eNodeB没有关于它的信息。在MATLAB中进行了仿真,验证了该方案具有良好的性能。
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引用次数: 0
CMOS Realization of Fully Electronically Tunable Single Resistance Control Mixed Mode Biquad Filter Employing Single VDTA at ± 0.6V 采用±0.6V单VDTA的全电子可调谐单电阻控制混合模式双滤波器的CMOS实现
Pub Date : 2021-04-26 DOI: 10.37394/23201.2021.20.6
Ghanshyam Singh, Hameed Pasha, H. C. Hadimani, Shafiqul Abidin, Zuleka Tabbusm
This paper presents a single VDTA based Mixed Mode type Biquad filter. The proposed Transadmittance Mode (TAM) type Biquad filter configuration employed single voltage differencing transconductance amplifier (VDTA) as an active building block, three passive element namely one grounded resistor, one grounded capacitor and one floating capacitor. The proposed transadmittance Mode multifunction Biquad filter configuration is presenting transadmittance mode type four basic standard filter functions low pass, high pass, band pass, band reject or band stop or band eliminate filter responses. These four type filter responses are realizing simultaneously with the selection of single input voltage signal. The proposed Transadmittance Mode multifunction Biquad filter configuration has more advantageous features such as low active and passive sensitivities, low power supply voltage, low power consumption, low quality factor, very low power consumption, more electronic tunability, higher linearity and required small area of the chip. The performance of the proposed configuration has been verified through PSPICE simulation using 0.18μm CMOS Technology process parameters.
提出了一种基于单VDTA的混合模式双路滤波器。所提出的跨导纳模式(TAM)型双路滤波器配置采用单电压差跨导放大器(VDTA)作为有源模块,三个无源元件,即一个接地电阻,一个接地电容器和一个浮动电容器。所提出的跨导纳模式多功能双路滤波器配置呈现跨导纳模式四种基本标准滤波器功能低通、高通、带通、带阻或带阻或带消滤波器响应。这四种滤波器响应与单输入电压信号的选择同时实现。所提出的跨导纳模式多功能双路滤波器配置具有低有源和无源灵敏度、低电源电压、低功耗、低品质因数、极低功耗、更强的电子可调性、更高的线性度和所需的芯片面积小等优势。采用0.18μm CMOS工艺参数,通过PSPICE仿真验证了该结构的性能。
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引用次数: 0
Cascade PI-Fuzzy Based Position Optimization of Nonal Switched UPQC with DG for Power Quality Enhancement in IEEE 14 Bus System 基于级联pi模糊的带DG的非开关UPQC在IEEE 14总线系统中的位置优化
Pub Date : 2021-04-08 DOI: 10.37394/23201.2021.20.5
H. R. Sukhesh, U Senthil Vadivu
An Unified Power Quality Conditioner (UPQC), owning the composition of shunt and series Active Power Filter (APF), has become a standard accepted solution in the area of current and voltage harmonics mitigation of a power system network. This paper furnishes a novel approach of nonal switched UPQC topology, supported with Distributed Generation (DG), aiming at the power quality enhancement and position optimization, placed at different locations in a standard IEEE 14 bus system. In addition to this, behaviour of the proposed topology is analysed using novel Cascade Proportional Integral (PI) - Fuzzy and Space Vector Pulse Width Modulation (SVPWM) as control algorithms and the outcomes are compared with the historical twelve switch UPQC topology. Simulation results of the proposal modelled in MATLAB/SIMULINK reveals the superiority of nonal switched UPQC and the optimal position of the proposed conditioner, for mitigating the harmonic issues in the standard IEEE 14 bus system.
统一电能质量调节器(UPQC)由并联型有源滤波器(APF)和串联型有源滤波器(APF)组成,已成为电网电流和电压谐波缓解领域公认的标准解决方案。本文提出了一种基于分布式发电(DG)的非切换UPQC拓扑结构的新方法,旨在提高电能质量和优化放置在标准IEEE 14总线系统中不同位置的位置。除此之外,使用新型级联比例积分(PI) -模糊和空间矢量脉宽调制(SVPWM)作为控制算法分析了所提出拓扑的行为,并将结果与历史上的12开关UPQC拓扑进行了比较。在MATLAB/SIMULINK中对该方案进行了仿真,结果表明非开关UPQC的优越性以及所提出的调节器的最佳位置,能够有效地缓解标准IEEE 14总线系统中的谐波问题。
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引用次数: 1
Controller Design for Descriptor-type Systems with Distributed Timedelay Using Extension 基于扩展的分布式时滞描述符系统控制器设计
Pub Date : 2021-03-30 DOI: 10.37394/23201.2021.20.3
A. Iftar
Controller design using extension is considered for descriptor-type systems with distributed time-delay. The approach is useful in decentralized controller design using overlapping decompositions. In this approach, a given largescale system is decomposed overlappingly into a number of subsystems and expanded such that the overlapping parts appear as disjoint. Since the subsystems appear as disjoint for the expanded system, it is easier to design a descentralized controller for the expanded system. This controller is then contracted for implementation on the original system. In the present paper, it is shown how to contract such a controller to guarantee stability and desired performance for the original system
针对具有分布时滞的描述符型系统,研究了基于扩展的控制器设计。该方法适用于使用重叠分解的分散控制器设计。在这种方法中,一个给定的大型系统被重叠地分解成许多子系统,并展开,使得重叠的部分看起来不相交。由于子系统在扩展系统中表现为不相交,因此更容易为扩展系统设计分散控制器。然后,该控制器被压缩以在原始系统上实现。在本文中,展示了如何收缩这样的控制器以保证原系统的稳定性和期望的性能
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引用次数: 2
PSO-Backstepping Design for Sharing Active and Reactive Power in Grid Connected DFIG Based Wind Turbine 风电并网DFIG有功无功共享的pso反演设计
Pub Date : 2021-03-30 DOI: 10.37394/23201.2021.20.4
S. Hassan, Badri Abdelmajid, Zegrari Mourad, S. Aicha, Bagudad Abdenaceur
An optimal backstepping controller is developed for doubly fed induction generator based wind turbine (DFIG). The objective is the control of active and reactive power exchanged between the generator and electrical grid in presence of uncertainty and reduce transient loads. The backstepping controller is coupled with an artificial bee colony aeroturbine algorithm in order to extract the maximum energy. Particle swarm optimization is used to select optimal value of backstepping’s parameters. The simulation is carried out on 2.4 MW DFIG based wind turbine system. The optimized performance of the proposed control technique under uncertainty parameters and transient load is established by simulation results. Key-Words: Nonlinear Backstepping Controller; DFIG; PSO; reduction transient loads. Received: February 26, 2021. Revised: March 15, 2021. Accepted: March 22, 2021. Published: March 30, 2021.
针对双馈感应发电机风力发电机组(DFIG),设计了一种最优反步控制器。目标是在不确定的情况下控制发电机和电网之间的有功和无功功率交换,减少暂态负荷。为了提取最大能量,将反步控制器与人工蜂群航空涡轮算法相结合。采用粒子群算法选择反演参数的最优值。对2.4 MW DFIG型风力发电机组系统进行了仿真。仿真结果验证了该控制方法在不确定参数和暂态负荷下的优化性能。关键词:非线性反演控制器;DFIG;算法;减少瞬态负荷。收稿日期:2021年2月26日。修订日期:2021年3月15日。录用日期:2021年3月22日。发布日期:2021年3月30日。
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引用次数: 4
Uninterruptible DC-powered boost differential inverter with a Sensorless Changeover System 具有无传感器转换系统的不间断直流升压差动逆变器
Pub Date : 2021-03-19 DOI: 10.37394/23201.2021.20.2
C. Eya, Ayodeji Olalekan Salau, Se Oti
This paper presents the design and implementation of an Uninterruptible DC-powered boost differential inverter with a sensor-less Changeover system. The systems design was developed using solar panels, bidirectional converter current linked battery banks, and a single-staged DC/AC Converter. The system was designed, modeled, and simulated using MATLAB/Simulink software before its implementation. The properties exhibited by the system include: Single stage input voltage transformation and amplification without a power transformer, lightweight sensor-less and relay-less automatic changeover, and a simplified feedback system. The simulation results show that the system gives a pure sine voltage and current waveforms, total harmonic distortion (THD) of 1.25%, efficiency of 94.4%, relatively fast dynamic response and 1 kilowatt power rating. The specific target areas of applications are: in medical paraphernalia where pure sine waveforms are needed, homes, and medium scale industries. Key-Words: Boost differential, Bidirectional Converter, Uninterruptible DC-power, Single stage, Sensor-less, pure sinewave, relay-less automatic, total harmonic distortion. Received: February 2, 2021. Revised: March 10, 2021. Accepted: March 12, 2021. Published: March 18, 2021.
本文介绍了一种具有无传感器转换系统的不间断直流升压差动逆变器的设计与实现。该系统的设计采用了太阳能电池板、双向变换器电流连接电池组和单级DC/AC变换器。在系统实现之前,使用MATLAB/Simulink软件对系统进行了设计、建模和仿真。该系统的特点是:单级输入电压变换和放大,无需电源变压器;轻量的无传感器和无继电器的自动转换;简化的反馈系统。仿真结果表明,该系统具有纯正弦电压和电流波形,总谐波失真(THD)为1.25%,效率为94.4%,动态响应速度较快,额定功率为1千瓦。具体的目标应用领域是:需要纯正弦波形的医疗设备,家庭和中等规模的工业。关键词:升压差动,双向变换器,不间断直流电源,单级,无传感器,纯正弦波,无继电器自动,总谐波失真收稿日期:2021年2月2日。修订日期:2021年3月10日。录用日期:2021年3月12日。发布日期:2021年3月18日。
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引用次数: 4
Novel Formulation for Line of Sight Guidance and Obstacle Avoidance for Under-actuated Ships 欠驱动船舶视线引导与避障新方法
Pub Date : 2021-03-16 DOI: 10.37394/23201.2021.20.1
N. Khaled, R. Alkhatib
Automatic control of under-actuated ships is a challenging task due to the external factors and limited actuators onboard a ship. It is even more so when the controller needs to seamlessly integrate with a guidance system and obstacle avoidance for the purpose of autonimity. In this paper, line of sight guidance system for marine surface vessels is augmented to include obstacle avoidance. The process of directing the ship movement to avoid a stationary and moving obstacles is tackled by introducing an iterative mathematical formulation for the circle of avoidance algorithm. Unlike learning based guidance system, the proposed formulation has an explicit solution that is updated at each instant in time. Three simulations are conducted to assess the performance of the overall guidance and avoidance system. The developed algorithm is validated through simulation results of a 6-degree of freedom model of a ship. The simulation results prove the effectiveness of the developed technique to converge the ship to the desired trajectory autonomously while avoiding obstacles along the path. Key-Words: Ship guidance system, trajectory planning, Line-of-Sight (LOS), Circle-of-Avoidance (COA) and obstacle avoidance. Received: January 15, 2021. Revised: February 25, 2021. Accepted: March 8, 2021. Published: March 16, 2021.
欠驱动船舶的自动控制是一项具有挑战性的任务,由于外部因素和船上有限的执行器。当控制器需要与引导系统和避障系统无缝集成以实现自主性时更是如此。本文对水面舰艇的视线制导系统进行了扩充,增加了避障功能。通过引入避障圈算法的迭代数学公式,解决了引导船舶运动避开静止和移动障碍物的过程。与基于学习的制导系统不同,所提出的公式具有在每个瞬间更新的显式解。通过三次仿真来评估整体制导与避碰系统的性能。通过船舶六自由度模型的仿真结果验证了该算法的有效性。仿真结果证明了该方法的有效性,该方法可以使船舶在避开障碍物的情况下自动收敛到目标轨迹。关键词:船舶制导系统,弹道规划,视距,避障圈,避障。收稿日期:2021年1月15日。修订日期:2021年2月25日。录用日期:2021年3月8日。发布日期:2021年3月16日。
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引用次数: 0
Intelligent Diagnosis Technology of Wind Turbine Drive System based on Neural Network 基于神经网络的风力机驱动系统智能诊断技术
Pub Date : 2021-02-24 DOI: 10.37394/23201.2020.19.31
Wei Yang, Yi Chai, Jie Zheng, Jie Liu
The seriousness of air pollution appears to be the importance of wind energy as a non-polluting energy source. Today, the use of wind power has become a trend for new countries to develop new energy sources. Wind turbines are the key equipment for converting wind energy into electrical energy, the quality of the state directly affects the efficiency of wind power generation. Therefore, how to effectively diagnose the wind turbine drive system is the guarantee of wind power generation. This paper establishes a fault diagnosis method for wind turbine drive based on vibration characteristics, by wavelet packet decomposition of vibration signals. The feature extraction is carried out and back propagation neural network is used for classification research. Finally, the simulation results show that the recognition rate is over 90%, which verify effectiveness of the proposed method.
空气污染的严重性显示出风能作为一种无污染能源的重要性。如今,利用风力发电已成为新兴国家开发新能源的一种趋势。风力发电机组是将风能转化为电能的关键设备,其状态的好坏直接影响到风力发电的效率。因此,如何对风力发电机组驱动系统进行有效的诊断是风力发电的保证。本文通过对振动信号进行小波包分解,建立了一种基于振动特征的风力发电机组故障诊断方法。进行特征提取,并利用反向传播神经网络进行分类研究。仿真结果表明,该方法的识别率达到90%以上,验证了该方法的有效性。
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引用次数: 5
FPGA implementation of elliptic curve cryptography engine for personal communication systems 用于个人通信系统的椭圆曲线密码引擎的FPGA实现
Pub Date : 2011-11-30 DOI: 10.5897/sre11.1727
M. Reaz, J. Jalil, H. Husian, F. H. Hashim
Elliptic Curve Cryptography (ECC), which allows smaller key length as compared to conventional public key cryptosystems, has become a very attractive choice in wireless mobile communication technology and personal communication systems. In this research, the ECC encryption engine has been implemented in Field Programmable Gate Arrays (FPGA) for two different key sizes, which are 131 bits and 163 bits. The cryptosystem, which has been implemented on Altera’s EPF10K200SBC600-1, has taken 5945 and 6913 logic cells out of 9984 for the key sizes of 131 bits and 163 bits respectively with an operating frequency 43 MHz, and performs point multiplication operation in 11.3 ms and 14.9 ms for 131 bits and 163 bits implementation respectively. In terms of speed, the cryptosystem implemented on FPGA is 8 times faster than the software implementation of the same system. . Key-Words: Encryption, ECC, FPGA, Synthesis, Hardware
椭圆曲线密码技术(ECC)与传统的公钥密码系统相比,其密钥长度更短,已成为无线移动通信技术和个人通信系统中非常有吸引力的选择。在本研究中,ECC加密引擎已在现场可编程门阵列(FPGA)中实现,用于两种不同的密钥大小,即131位和163位。该密码系统已在Altera公司的EPF10K200SBC600-1上实现,在工作频率为43 MHz的情况下,对131位和163位的密钥大小分别采用9984个逻辑单元中的5945个和6913个,并分别在11.3 ms和14.9 ms内执行131位和163位的点乘法运算。在速度方面,在FPGA上实现的密码系统比相同系统的软件实现快8倍。关键词:加密,ECC, FPGA,综合,硬件
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引用次数: 7
期刊
WSEAS Transactions on Circuits and Systems archive
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