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Robust Stabilization for Networked control Systems With Nonlinear Perturbation

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Robust Stabilization for Networked Control Systems With Nonl...

第三十届中国控制会议

作者： GAO Jinfeng~(1,2),ZHAO Xinlong~1,BAI Jianjun~2,SU Hongye~2 1.Institute of Automation,zhejiang Sci-Tech university,hangzhou 310018,P.R.china 2.state key laboratory of industrial control technology,zhejiang university,Yuquan Campus,hangzhou 31.02.,P.R.china

＜正＞This note discusses the problem of stabilization for a class of uncertain networked control systems（NCSs） with nonlinear *** introducing a new model of NCSs with parameter uncertainty,network-induced delay,nonlinearity and data packet dropout in the transmission,a strict linear matrix inequality（LMI） criterion is presented for robust stabilization the uncertain nonlinear NCSs based on the Lyapunov stability *** maximum upper bound of the allowable delay can be obtained by solving the convex optimization problem of the corresponding *** example is provided to demonstrate the applicability and feasibility of the proposed algorithm.

关键词： Networked control systems(NCSs) Robust control Nonlinearity Linear matrix inequality

PRESSURE BUCK SWITCHMODE HYDRAULIC POWER SUPPLY WITH RETURN PRESSURE

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PRESSURE BUCK SWITCHMODE HYDRAULIC POWER SUPPLY WITH RETURN ...

第四届流体传动国际会议

作者： Zhang Xiaofeng, Gu Linyi The state key laboratory of Fluid Power Transmission and control, zhejiang university, 31.02. hangzhou,china

Switchmode hydraulic power supply is a new kind of energy-saving pressure convert device. In this paper, a new type of pressure buck switchmode hydraulic power supply is put forward, in which a return pressure is introduced to increase its instantaneous efficiency. Simulations show that the total efficiency is increased considerably although the introduction of throttle lost in the return-to-tank pipe.

关键词： switchmode hydraulic power supply pressure buck hydraulic inductor hydraulic capacitor dynamic efficiency instantaneous efficiency

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电脉冲消除45钢淬火件的残余应力

浙江大学学报（工学版） 2012年第8期46卷 1407-1411页

作者：郑建毅何闻施彦彬浙江大学流体传动及控制国家重点实验室浙江省先进制造技术重点实验室现代制造工程研究所浙江杭州310027 厦门大学机电工程系福建厦门361005

为了研究电脉冲消除金属材料内部残余应力的效果,通过储能电容器放电产生高能电脉冲,对淬火后的45优质碳素结构钢冷轧薄板件进行放电处理,采用小孔法测定电脉冲处理前后试样内残余应力的变化规律.用于电脉冲处理的脉冲电流为指数衰减的... 详细信息

为了研究电脉冲消除金属材料内部残余应力的效果,通过储能电容器放电产生高能电脉冲,对淬火后的45优质碳素结构钢冷轧薄板件进行放电处理,采用小孔法测定电脉冲处理前后试样内残余应力的变化规律.用于电脉冲处理的脉冲电流为指数衰减的振荡波形,同时满足第一个主峰的电流密度为12.2kA/mm2,单次处理的振荡脉冲持续时间小于0.8ms.试验结果表明,经过电脉冲处理后,45钢淬火件中2个主方向残余应力的幅值均出现较为显著的降低,且两者都出现均化效果.

关键词：电脉冲 45钢残余应力小孔法

Evaluation of Heart state Variation and Neural control Parameters with Animal Models

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Chinese Journal of Biomedical Engineering(English Edition) 2002年第4期11卷 143-165页

作者： GE Ji guang 1, GE Yao zheng 2, CHEN Hang 1,XU Zheng 1 Department of Biological Science and technology of zhejiang university, hangzhou 31.02.,china 2.state key Lab of FPTC zhejiang university,hangzhou 31.02.,china

Heart state information and neural control expounded by multiple parameters are useful for early diagnosis of heart diseases. The purpose of this article is to investigate the effectiveness of multiple parameters for express heart state variation and neural control. We have studied three kinds of parameters global, local and dynamic ones with different confirmation method to extract concealed physiological and pathological heart information with animal models. Pathological notch on QRS complex of electrocardiogram (ECG) is defined as a local parameter which is one of the high frequency components (HFCs). The poincare dispersed dot plot (PDDP) is defined as a nonlinear global parameter. Pathological notching information on the QRS complex is related to myocardial injuries. We have been working on man made myocardial infarction models to simulate cardiac abnormalities. Thirty eight percent (38%) formalin was used to produce acute myocardial injury and several branches of coronary anterior descending branch near apex and part of blunt edge branch were ligatured for creating chronic pathological changes in order to form small injurious areas at left ventricular side wall. And we found that both myocardial injury approaches could produce good idiosyncratic relationship between injury area model and man made pathological condition. A large number of repetitive experiments of animal model indicated that the thresholds of pathological notching are about 84 μV in amplitude and 3.8 ms in width. The PDDP was a good parameter of heart nonlinear state and heart rate variability (HRV). It has thresholds of about 26000 ms 2 in area and 420 ms in long axis for human being and 600 ms 2 in area and 85 ms in long axis for dogs. Both parameters exhibit sensitive and early response to heart states pathological variation and also have dynamic characteristics.

关键词： High Frequency ECG Notch Slur Poincare dispersed plot Nonlinear dynamics

Genetic Algorithm for Scheduling Problem of Chemical Batch Process with Due Date Constraints

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厦门大学学报（自然科学版） 2002年第S1期41卷 147-页

作者： SONG Jie-wei, RONG Gang (National key laboratory of industrial control technology, zhejiang U niversity, hangzhou 31.02., china)

The intense competition in the current marketplace ha s forced firms to reexamine their methods of doing business, using superior manu facturing practices in the form of just-in-time (JIT), production with JIT pra ctices pursue completion on time and zero inventory, which is often instruct ed according to the custom’s demand or the sale contract. Earliness and tardine ss are undesirable because both of them will bring the extra cost, cost will als o be increased by some factors such as operation condition, intermediate storage , clean method, etc, to minimize the total cost is often the main scheduling objective, but sometime it is most important for factories to eliminate the tar diness cost in order to maintain the commercial credit and to avoid penalty, the refore, minimum of tardiness cost becomes the first objective. It is more import ant to select a reasonable objective by the actual condition during scheduli ng. In this paper scheduling problem of chemical batch process with due date is studied, two different intermediate storage policies and two different productio n modes are also discussed, production scheduling with different intermediate st orage policy and different production mode is proposed and the result is compare d. In order to complete all products within the due date, not only earliness and tardiness but also holding problem is considered, the objective is to selec t a proper intermediate storage policy and production mode and to minimize the c ost resulted by the earliness and tardiness, even the cost result by the interme diate storage. Scheduling with multiple stage and multiple machine is known as a NP-hard problem, mathematical program (MP) method, such as branch-and-bound (BAB), mixed integer linear program (MILP), etc, is often used to solve the sche duling problem. But as is well known, MP method is not good for combination opti mization, especially for large scale and complex optimal problem, whereas geneti c algorithm (GA) can overcome

关键词： batch process earliness and tardiness genetic a lgorithms hold cost intermediate storage JIT scheduling

一类多输入多输出系统的预测PID控制算法仿真

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系统仿真学报 2004年第3期16卷 495-498,503页

作者：李林欢苏宏业褚健工业控制技术国家重点实验室

研究了一类参数未知的多变量系统的广义预测PID参数整定问题。基于广义预测控制(GPC)的思想和gGPC与PID的相互关系,提出了一种新的离散多变量系统PID参数整定方法,其中性能指标包含了稳态误差加权项。PID参数通过gGPC与PID的相互关系递... 详细信息

研究了一类参数未知的多变量系统的广义预测PID参数整定问题。基于广义预测控制(GPC)的思想和gGPC与PID的相互关系,提出了一种新的离散多变量系统PID参数整定方法,其中性能指标包含了稳态误差加权项。PID参数通过gGPC与PID的相互关系递推计算得到。仿真例子说明了该方法的有效性和可行性。

关键词：多变量系统 PID参数整定广义预测控制(GPC) 稳态误差

Multi-PID control of Hammerstein Systems with Input Multiplicity

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Multi-PID Control of Hammerstein Systems with Input Multipli...

第三十届中国控制会议

作者： DU Jingjing~1,ZHANG Xinliang~1,SONG Chunyue~2 1.School of Electrical Engineering and Automation,Henan Polytechnic university,Jiaozuo 454000,P.R.china 2.state key Lab.of industrial control technology,Institute of industrial Process control, zhejiang university,hangzhou 31.02.,P.R.china

＜正＞Hammerstem models are popular in describing nonlinear chemical *** general control strategy for Hammerstem models is the nonlinearity inversion method,which is unfortunately inapplicable to Hammerstem systems with input *** overcome this difficulty,a Multi-PID control approach is ***,a complex control problem is solved by a conventional and

关键词： Hammerstein system Nonlinearity inversion method Input multiplicity Multi-PID

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基于拼装参数优化的盾构机管片拼装节能技术

浙江大学学报（工学版） 2012年第12期46卷 2259-2267页

作者：王林涛龚国芳施虎浙江大学流体动力与机电系统国家重点实验室浙江杭州310027

地铁隧道通常由成千上万的环管片拼接而成,为减少盾构机在管片拼装过程中的能量消耗,提出基于运动参数优化的管片拼装节能技术.以Ф3.2m试验盾构为研究对象,在分析管片定位时管片拼装机构各自由度运动与受力状况的基础上,建立管片拼装... 详细信息

地铁隧道通常由成千上万的环管片拼接而成,为减少盾构机在管片拼装过程中的能量消耗,提出基于运动参数优化的管片拼装节能技术.以Ф3.2m试验盾构为研究对象,在分析管片定位时管片拼装机构各自由度运动与受力状况的基础上,建立管片拼装机在完成同一环不同位置管片的定位工作过程中系统做功与能量分布的数学模型,通过解决以消耗能量为目标函数、管片目标位置为约束条件的优化问题,得到在实现最小能量消耗的拼装过程中各执行器运动参数确定原则与求解方法.通过对比计算3种不同拼装路径下拼装机消耗能量情况表明,使用参数优化选择方法确定的拼装路径最高可达到4%的节能效果,在实际隧道掘进中累计节能效果将更加明显.

关键词：盾构机管片拼装参数优化节能

Soft Sensor for Distillation Column Feeds

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Soft Sensor for Distillation Column Feeds

2009中国控制与决策会议

作者： Lingyu Zhu~(1,2),Xi Chen~(1*),Zhijiang Shao~1,Jixin Qian~1 1.state key laboratory of industrial control technology,Department of control Science & Engineering, zhejiang university,hangzhou,31.02. 2.College of Chemical Engineering and Materials Science,zhejiang university of technology,hangzhou,310014

＜正＞Distillation columns are normally controlled at a pre-designed condition,which is the optimal for a specified feed *** reality,however,the feeds may vary in their flow rates,temperatures,or compositions,which results in the distillation process operating at non-optimal ***,it is ideal to optimally adjust the operations in conjunction with the real feed *** online hardware measurement of the feed status,however,is basically impossible for most columns.A method using the temperature measurements along the distillation column to detect the feed variations is proposed in this *** is conducted through simulations under different *** derivative-based and derivative-free optimization methods are discussed for the soft-sensor establishment.

关键词： distillation column optimal operation feed variation temperature distribution soft-sensor.