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2016 2nd International Conference on Control Science and Systems Engineering (ICCSSE)最新文献

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Coordinated control system modeling of supercritical unit based on improved firefly algorithm 基于改进萤火虫算法的超临界机组协调控制系统建模
Song M. Jiao
With the development of power industry, ultra-supercritical unit becomes main thermal power-generate unit. If we grasp the characteristics of the unit's coordinated control system, control quality of the whole system can be improved. Furthermore, the economy and safety of power generation can be increased. Firefly algorithm is an excellent optimization algorithm and is suitable for modeling. But there exist some problems in its application such as local extreme and low optimization precision. Be aimed at these problems, random search and some new variable coefficient strategy are designed to improve original algorithm. Simulation results show that the improved firefly algorithm has better performance in optimization precision, convergence speed and ability of eliminating local extreme. The improve algorithm is used to set up a three-input-three-output coupled coordinated control system's mathematic model. Results showed that these models have excellent similarity with actual objects.
随着电力工业的发展,超超临界机组已成为火力发电的主力机组。掌握机组协调控制系统的特点,可以提高整个系统的控制质量。进一步提高了发电的经济性和安全性。萤火虫算法是一种优秀的优化算法,适合于建模。但在实际应用中存在局部极值和优化精度低等问题。针对这些问题,设计了随机搜索和一些新的变系数策略来改进原算法。仿真结果表明,改进后的萤火虫算法在优化精度、收敛速度和局部极值消除能力等方面具有更好的性能。利用改进算法建立了三输入三输出耦合协调控制系统的数学模型。结果表明,这些模型与实际物体具有很好的相似性。
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引用次数: 2
Adaptive nonsingular terminal sliding mode control strategy for PMSC PMSC自适应非奇异终端滑模控制策略
X. Gong, Haobin Jiang, G. Geng, Bin Tang
The structure and principle of permanent magnet slip clutch (PMSC) which was the important component of P-ECHPS was introduced, and the speed adjustment model of PMSC was set up too. PMSC output speed what is equivalent to steering pump speed should have the performance with great response agility and it has many uncertainties in the process of steering for heavy-duty vehicles. To tackle these problems, nonsingular terminal sliding mode (NTSM) control strategy combined with adaptive control was adopted. The simulation results indicate that adaptive NTSM control strategy is highly effective and accurate, and it has better anti-interference ability. The tracking performance of adaptive NTSM is greater than sliding mode control (SMC) and PID control, and the convergence rate increased by 48% than SMC.
介绍了p - ecps的重要部件——永磁滑移离合器的结构和工作原理,建立了永磁滑移离合器的调速模型。PMSC输出转速相当于转向泵转速,在重型车辆转向过程中具有很大的响应敏捷性和不确定性。针对这些问题,采用非奇异终端滑模(NTSM)控制策略与自适应控制相结合。仿真结果表明,自适应NTSM控制策略高效、准确,具有较好的抗干扰能力。自适应NTSM的跟踪性能优于滑模控制(SMC)和PID控制,收敛速度比SMC提高48%。
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引用次数: 2
Orbital three-player differential game using semi-direct collocation with nonlinear programming 半直接搭配非线性规划的轨道三人微分对策
Yifang Liu, Renfu Li, Shuquan Wang
An orbital three-player differential game among Target spacecraft, Pursuer spacecraft and Evader spacecraft is studied in this work. It is assumed that Target spacecraft runs in its orbit without the ability of maneuver, while Pursuer spacecraft and Evader spacecraft have continuous maneuverability. There are opposing objectives between Pursuer spacecraft and Evader spacecraft. The objective of Pursuer spacecraft is to keep Evader spacecraft far away from Target spacecraft while Evader spacecraft tries its best to shorten the distance from it to Target spacecraft prior to being intercepted. The orbital three-player differential game terminates when Evader spacecraft performs successful interception of Target spacecraft or it is intercepted by Pursuer spacecraft. The semi-direct collocation with nonlinear programming incorporated with NSGA-II algorithm which provides the initial guess is employed to solve the current three-player differential game. Numerical simulation was provided to verify the availability of the algorithm in finding the optimal solution of the orbital three-player differential game presented in this paper, and the results show that this work will be useful to some practical applications.
本文研究了目标航天器、追踪航天器和逃避航天器之间的轨道三人微分博弈问题。假设目标航天器在其轨道上无机动能力运行,而追赶航天器和逃避航天器具有连续机动能力。追击者飞船和逃避者飞船之间有对立的目标。追赶者航天器的目标是使逃避者航天器远离目标航天器,而逃避者航天器在被拦截前尽量缩短与目标航天器的距离。当逃避者航天器成功拦截目标航天器或被追踪者航天器拦截时,轨道三人微分博弈终止。将非线性规划的半直接配置与提供初始猜测的NSGA-II算法相结合,求解了当前的三人微分对策。通过数值模拟验证了该算法在求解轨道三人微分对策最优解中的有效性,结果表明该算法具有一定的实际应用价值。
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引用次数: 6
Minimally invasive spinal surgical robot velocity control method 微创脊柱手术机器人速度控制方法
G. Song, Yiwen Zhao, Jianda Han, Zheng Wang, Huibin Du
Vertebral pedicle screw placement is an important part of spine surgery, surgreons hand screw placement turnover rate was higher. With the development of surgical robot and the robot navigation technology, robot surgery applied in surgery became reality. Currently, the main purpose of surgical robot is assisting the doctor to establish trajectory of pedicle screw. These could not exert the high performance of robot on precision and speedy. Compared to conventional industrial robots, the complexity and uncertainty in the surgical environment and security needs of surgery will restrict the robot to complete the operation automatically. This paper establishes velocity field in operative space, completed the simulation and experimental of surgical robot automatic inserting pedicle screw. The simulation results show the velocity field of the control algorithm advantages of minimally invasive spine surgery procedure that can guarantee the integrity of the contour under disturbance conditions and to avoid damage to the nerve root.
椎弓根螺钉置入是脊柱外科手术的重要环节,外科医生手置螺钉的周转率较高。随着手术机器人和机器人导航技术的发展,机器人手术在外科手术中的应用成为现实。目前,手术机器人的主要目的是协助医生建立椎弓根螺钉的运动轨迹。这些都不能发挥机器人在精度和速度上的高性能。与传统工业机器人相比,手术环境的复杂性和不确定性以及手术的安全性需求将限制机器人自动完成手术。建立手术空间的速度场,完成手术机器人自动置入椎弓根螺钉的仿真与实验。仿真结果表明,该速度场控制算法具有微创脊柱外科手术的优点,能够在干扰条件下保证轮廓的完整性,避免损伤神经根。
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引用次数: 0
Dynamic traffic light timing optimization model using bat algorithm 基于bat算法的动态红绿灯配时优化模型
K. Jintamuttha, B. Watanapa, Nipon Charoenkitkarn
Nowadays, traffic congestion is a crucial issue for many urban or even suburban areas. A potential but manageable cause of this effect is the inefficient control of traffic light timing cycle that is not proactively respond to the characteristics of the considering intersection and time-dependent condition of the traffic. In this paper, we propose a finite-interval model that finds effective green time for each of the four phases light timing in each cycle. The objective is to acquire satisficing solution, by means of Bat algorithm (BA) to minimize spoilage time at an intersection. The effectiveness of model was validated using a simulation experiment on a crowded intersection in Bangkok that has imbalanced numbers of accommodated lanes and formless urbanism. The traffic condition is simulated by the microscopic traffic simulator called `Simulation of Urban Mobility' (SUMO). The experimental result confirmed the effective improvement when compared with the traditional fix-time operational control.
如今,交通拥堵是许多城市甚至郊区的一个重要问题。造成这种影响的一个潜在但可控的原因是对交通灯定时周期的低效控制,它没有主动响应所考虑的交叉口的特征和交通的时间依赖条件。在本文中,我们提出了一个有限区间模型,该模型可以在每个周期的四个阶段中找到每个阶段的有效绿灯时间。目标是利用蝙蝠算法(Bat algorithm, BA)求得交叉口的满意解,使交叉口的破损时间最小。在曼谷一个拥挤的十字路口进行了模拟实验,验证了模型的有效性,该十字路口的可容纳车道数量不平衡,城市主义形式化。交通状况由微观交通模拟器模拟,称为“城市交通模拟”(SUMO)。实验结果表明,与传统的固定时间操作控制相比,该控制方法得到了有效的改进。
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引用次数: 7
Coordinated optimization control strategy for hybrid energy storage system based on real-time online analysis of power spectrum 基于功率谱实时在线分析的混合储能系统协调优化控制策略
Tang Chenghong, Wang Jinsong, Y. Zhihong, Jin Peng
To prevent the distribution network from being effected by the output power fluctuation of photovoltaic, wind and other renewable energy generation, this paper presents a coordinated optimization control strategy for hybrid energy storage system based on real-time online analysis of power spectrum. Compared with the smoothing method used nowadays, it solves the existing problem that the smoothing objective could not be satisfied in an extreme power fluctuate scenario; The developed device has been applied in a number of engineering projects and both the simulation and practical applications prove the effectiveness of the strategy to improve the power quality and realize a smooth access for renewable energy.
为防止配电网受到光伏、风能等可再生能源发电输出功率波动的影响,提出了一种基于实时在线功率谱分析的混合储能系统协调优化控制策略。与现有的平滑方法相比,该方法解决了功率极端波动情况下无法满足平滑目标的问题;该装置已在多个工程项目中得到应用,仿真和实际应用均证明了该策略在改善电能质量、实现可再生能源顺利接入方面的有效性。
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引用次数: 2
A novel autocorrelation approach for frequency estimation of a sinusoid 一种新的正弦信号频率估计自相关方法
Chao H. Huang, Jidong Suo, T. Liu
Based on the linear prediction (LP) property of sinusoidal signals, a novel autocorrelation approach for a single-tone sinusoidal signal emerged in Gaussian white noise is proposed. Firstly, a new closed-form autocorrelation expression is derived that it contributes more to frequency estimation than conventional autocorrelation expressions, then, inspired by RIM estimator, we propose a novel estimator using multiple autocorrelation lags. Computer simulations show that the accuracy of the proposed approach is closer to the Cramer-Rao bound(CRB) especially for lower signal noise radio(SNR) and has lower computation complexity via comparing with several autocorrelation-based estimators.
基于正弦信号的线性预测特性,提出了一种针对高斯白噪声中单音正弦信号的自相关方法。首先,推导了一种新的封闭自相关表达式,它比传统的自相关表达式对频率估计的贡献更大;然后,受RIM估计器的启发,我们提出了一种新的利用多个自相关滞后的估计器。计算机仿真结果表明,与几种基于自相关的估计方法相比,该方法在较低信噪比下精度更接近于Cramer-Rao界(CRB),并且具有较低的计算复杂度。
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引用次数: 1
Considering higher terms of description function for limit cycle generated by friction 考虑由摩擦产生的极限环的更高项描述函数
Sulan Li, Yu Jin
In servo systems, there are various nonlinear factors, including friction, backlash and saturation, which will affect the system accuracy, even produce limit cycles. Therefore, the study of the nonlinearity in the system has important theoretical and engineering value. And limit-cycle caused by friction, including its generation and avoiding are focused on. Firstly, the description function for coulomb and viscosity friction model is derived, respectively. Secondly, the effect of numbers of frequency terms considered in description function is discussed. The feature of the phase and amplitude of limit-cycle is studied. Thirdly, a servo system with friction nonlinearity is taken as an example. The simulation results show the correctness of the theoretical deduction.
在伺服系统中,摩擦、间隙、饱和等非线性因素会影响系统精度,甚至产生极限环。因此,对系统非线性的研究具有重要的理论和工程价值。并重点讨论了摩擦引起的极限环,包括其产生和避免。首先推导了库仑摩擦模型和黏度摩擦模型的描述函数。其次,讨论了描述函数中频率项个数的影响。研究了极限环的相位和幅值特征。第三,以具有摩擦非线性的伺服系统为例。仿真结果验证了理论推导的正确性。
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引用次数: 0
A gait recognition based on link model of infrared thermal imaging 基于红外热成像链路模型的步态识别
Zhan-ying Lu, Yichen Xu, Zuoxiao Dai, Bei Ma
In the environment of complex background, load and night, the correct gait recognition rate is greatly affected in visible image, in order to solve this problem, this paper use thermal infrared imager to capture image in different body, different scene and different angle, then image threshold, frame-difference and contour auto adjustment method are used to extract human body outline, the feature vector of each joints are extracted by modified five link model, after that the extracted feature vector of each joint is passed to the SVM classifier to identify the characters. Leave-one-out method is used to calculate the correct rate of recognition, the final recognition correct rate is between 71-92%, in the night, load and other complex background scenes, the correct recognition rate is much better than visible light.
在复杂的背景、负载和夜间环境下,可见光图像中步态的正确识别率受到很大影响,为了解决这一问题,本文利用热红外成像仪采集不同身体、不同场景和不同角度的图像,然后采用图像阈值、帧差和轮廓自动调整的方法提取人体轮廓,通过改进的五连杆模型提取各关节的特征向量。然后将提取的每个关节的特征向量传递给SVM分类器进行特征识别。采用留一法计算识别正确率,最终识别正确率在71-92%之间,在夜间、负载等复杂背景场景下,正确识别率远优于可见光。
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引用次数: 5
Measure of invulnerability for command and control network based on network invulnerability entropy 基于网络不脆弱性熵的指挥控制网络不脆弱性测度
Yun-ming Wang, Duoping Zhang, Chengsheng Pan, Bo Chen
The factors such as hardware malfunction and invasion, can lead to the nodes and edges failure of Command and Control (C2) network, which divide the original connected network topology, even result in global network damage. To assess the invulnerability of the C2 network dynamically, this study has proposed a measurement of invulnerability for C2 network based on network invulnerability entropy, established an invulnerability entropy model based on the degree of network invulnerability, and put forward node criticality based on Level Flow Betweenness (LFB) and edge criticality based on information transfer efficiency, respectively. Simulation results showed that this measurement of invulnerability is highly sensitive and accurate, able to better reflects the invulnerability and provide a theoretical basis for design and optimization the structure of C2 network.
硬件故障、入侵等因素会导致C2网络的节点和边缘失效,使原有的连通网络拓扑结构发生分裂,甚至造成全局网络破坏。为动态评估C2网络的不脆弱性,本文提出了基于网络不脆弱性熵的C2网络不脆弱性度量方法,建立了基于网络不脆弱性程度的不脆弱性熵模型,并分别提出了基于水平流间度(Level Flow betweness, LFB)的节点临界性和基于信息传递效率的边缘临界性。仿真结果表明,该测量方法具有较高的灵敏度和准确性,能够较好地反映网络的抗毁性,为C2网络结构的设计和优化提供理论依据。
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引用次数: 2
期刊
2016 2nd International Conference on Control Science and Systems Engineering (ICCSSE)
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