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第26届中国过程控制会议（CPCC2015）

作者： Wang Jishuai Gu De Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences State Key Lab.of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Institute of Automation Jiangnan University

In this paper, a discrete mathematical approach to solve scheduling of multi-pipeline systems for petroleum products under demand uncertainty is presented. To deal with the uncertainty, the conditional value-at-risk(CVAR) analysis is adopted as a risk measure. Firstly an improved scheduling approach is proposed to model the multi-pipeline system with the consideration of different pipeline segment sizes. The improved formulation is computationally intractable when pipeline segments have distinct capacities. Then the model takes a scenario-based approach to cope with uncertainty in a CVAR framework. Computational results are presented to demonstrate the effectiveness of the proposed approach. All the instances are implemented using CPLEX.

关键词： Multiproduct pipeline Scheduling MILP formulation Pump

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A Novel Adaptive Rejection control Approach for Multiple Narrow-band Disturbances in Nano-manipulating Systems

A Novel Adaptive Rejection Control Approach for Multiple Nar...

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The Society of Instrument and control Engineers Annual Conference 2015

作者： Zeshan Lyu Peng Yan Zhen Zhang School of Automation Science and Electrical Engineering Beihang University Key Laboratory of High-efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical EngineeringShandong University Department of Mechanical Engineering Tsinghua University Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua University

This paper presents an innovative method for rejecting multiple narrow-band disturbances in nano-manipulating servo systems. The proposed control scheme consists of a robust controller and a multiple optimal phase filter structure. The baseline robust controller is synthesized with mixed sensitivity optimization for the purpose of robust stability and servo performance.A novel adaptive digital multiple optimal phase filter structure is then developed with a parallel connection, such that online estimation and suppression of the narrow-band disturbances with unknown or time-varying frequencies can be achieved without sacrificing the stability robustness of the closed-loop systems. The proposed control scheme is evaluated via simulations and implemented on a piezoelectric-actuator driven nanopositioner, where high precision positioning is demonstrated in the presence of both unmodeled dynamics and multiple disturbances.

关键词： multiple narrow-band disturbance rejection,piezoelectric-actuator driven nanopositioning,mixed sensitivity optimization

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Spatial S-R compatibility effect with head rotation

Spatial S-R compatibility effect with head rotation

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International MultiConference of Engineers and Computer Scientists, IMECS 2014

作者： Tsang, Steve N.H. Kang, Stefanie X.Q. Chan, Alan H.S. Department of Systems Engineering and Engineering Management City University of Hong Kong Kowloon Tong Kowloon Hong Kong School of Management Xi'an Jiao Tong University State Key Lab. for Manufacturing Key Lab. of the Ministry of Education for Process Control and Efficiency Projects Xi'an710049 China

ISBN: (纸本)9789881925336

The effects of signal modality (visual and auditory), hand condition (crossed and uncrossed), and head orientation (upright, right-90, left-90, and left back) on response performance were e xamined in this study. The results showed all the factors significantly affected the reaction time of participants and there was an interaction effect between signal modality and head orientation. Responses for visual signals were significantly faster than those for auditory signals, and responses made with uncrossed hand were superior to those with crossed hand. On head orientation, upright orientation produced the fastest reaction time, while reaction time for head rotated 90° right (right-90) was significantly faster than that for head rotated 90° left (left-90) and rotated left backward (left back). Regarding the significant interaction effect between signal modality and head orientation, processing time for visual signals was always faster than that for auditory signals. Such modality superiority increased to a larger extent under the left 90 and left back head orientations. The findings in this experiment provide some practical ergonomics recommendations for improving control console design in terms of signal-response layout, stimulus-hand arrangement, head orientation, and methods of presenting visual and auditory signals.

关键词： Ergonomics

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Analysis of the bullwhip effect in two parallel supply chains with interacting price-sensitive demands

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European Journal of Operational Research 2015年第3期243卷 815-825页

作者： Yungao Ma Nengmin Wang Zhengwen He Jizhou Lu Huigang Liang School of Management Xi'an Jiaotong University Xianning Road Xian Shaanxi 710049 No. 28 China The Key Lab of the Ministry of Education for Process Control & Efficiency Engineering Xianning Road Xian Shaanxi 710049 No. 28 China State Grid Energy Research Institute Changping District 102209 Beijing China Department of Management Information Systems College of Business East Carolina University Greenville NC 27858 USA

This paper offers insights into how the bullwhip effect in two parallel supply chains with interacting price-sensitive demands is affected in contrast to the situation of a single product in a serial supply chain. In particular, this research studies two parallel supply chains, each consisting of a manufacturer and a retailer, and the external demand for a single product depends on its price and the other's price in a situation in which each price follows a first-order autoregressive process. In this paper, we propose an analytical framework that incorporates two parallel supply chains, and we explore their interactions to determine the bullwhip effect. We identify the conditions under which the bullwhip effect is amplified or lessened with interacting price-sensitive demands relative to the situation without interaction.

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The mean free path of gas molecules in confined nano-porous structures 15

The mean free path of gas molecules in confined nano-porous ...

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15th International Heat Transfer Conference, IHTC 2014

作者： Wei, Gaosheng Wang, Lixin Du, Xiaoze Yang, Yongping School of Energy Power and Mechanical Engineering Key Lab. of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University Beijing102206 China

Based on the Zeng's model and in combination with simplified unit cell structure of cubic array of nano-spheres, the influencing factors, mechanism, and variation process of mean free path in confined nano-porous structures are analyzed in this paper. The results show that the nano-porous structure features of nano-porous materials are directly related with specific surface area and density. The mean free path of gas molecules in confined nanoporous structures decreases apparently with the rising of specific surface area and density. The nano-porous materials with a relative higher specific surface area and a larger density are more favorable for confining the gaseous conductivity in nano pores. It is shown that p=104 Pa and p=4×105 Pa are two inflection pressures at ambient temperatures. When p4 Pa, the mean free path of gas molecules almost does not change with vary of pressure due to the restriction effect of nano-porous structures. When p>4×105 Pa, the limiting effect of nanoporous structures on movement of gas molecules can be ignored, the mean free path of gas molecules in nanoporous materials approach to the mean free path of gas molecules in free space. With the increase of temperature, the mean free path of gas molecules in nano-porous space is increasing, while, the increasing rate decreases gradually.

关键词： Specific surface area

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Multiple-disturbance rejection for high precision positioning of a VCM servo gantry 19

Multiple-disturbance rejection for high precision positionin...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Lyu, Zeshan Yan, Peng Zhang, Zhen Guo, Lei School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Key Laboratory of High-Efficiency and Clean Mechanical Manufacturing Ministry of Education School of Mechanical Engineering Shandong University Jinan Shandong250061 China Beijing Key Lab. of Precision/Ultra-Precision Manufacturing Equipment and Control Department of Mechanical Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9783902823625

This paper presents an multiple disturbance rejection approach for rejecting narrow-band disturbances as well as norm-bounded random disturbances, with applications to high precision positioning of a Voice Coil Motor (VCM) actuated servo stage. An adaptive optimal phase filter design method is proposed for the rejection of frequency-varying narrow-band disturbances at unknown frequency range. With a parallel connection of the proposed adaptive filter, a robust H∞ controller can be synthesized with mixed sensitivity optimization for the purpose of both robust stability and rejection of norm-bounded random disturbances. The proposed control architecture is implemented to a VCM servo gantry to achieve high precision positioning in the presence of various disturbances. © IFAC.

关键词： Disturbance rejection

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Discrete time-varying internal model-based control of a novel parallel kinematics multi-axis servo gantry 19

Discrete time-varying internal model-based control of a nove...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Zhang, Zhen Yan, Peng Wang, Peng Department of Mechanical Engineering Tsinghua University Beijing100084 China Beijing Key Lab. of Precision Ultra-Precision Manufacturing Equipment and Control Tsinghua University 100084 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Key Laboratory of High-Efficiency and Clean Mechanical Manufacturing Ministry of Education School of Mechanical Engineering Shandong University Jinan Shandong250061 China

ISBN: (纸本)9783902823625

This paper presents an internal model-based approach for trajectory tracking in the discrete time-varying setting. A newly designed parallel kinematics servo gantry is well suited for high precision contouring at high speed ranges. The discrete time-varying internal model-based control is developed for controlling the servo gantry system to track complicated trajectories generated by linear time-varying systems. Based on a novel parallel time-varying internal model structure, a low order robust discrete time-varying stabilizer is synthesized. The proposed tracking control architecture is deployed on the novel parallel kinematics servo gantry system to achieve high precision contour tracking performance for frequency-varying signals generated by high order time-varying autonomous system. © IFAC.

关键词： Time varying control systems

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High-efficiency, broad-band and wide-angle optical absorption in ultra-thin organic photovoltaic devices

High-efficiency, broad-band and wide-angle optical absorptio...

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作者： Wang, Wenyan Hao, Yuying Cui, Yanxia Tian, Ximin Zhang, Ye Wang, Hua Shi, Fang Wei, Bin Huang, Wei Key Lab. of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Yanchang Road 149 Shanghai 200072 China Nanjing 210046 China

Metal nanogratings as one of the promising architectures for effective light trapping in organic photovoltaics (OPVs) have been actively studied over the past decade. Here we designed a novel metal nanowall grating with ultra-small period and ultra-high aspect-ratio as the back electrode of the OPV device. Such grating results in the strong hot spot effect in-between the neighboring nanowalls and the localized surface plasmon effect at the corners of nanowalls. These combined effects make the integrated absorption efficiency of light over the wavelength range from 400 to 650 nm in the active layer for the proposed structure, with respect to the equivalent planar structure, increases by 102% at TM polarization and by 36.5% at the TM/TE hybrid polarization, respectively. Moreover, it is noted that the hot spot effect in the proposed structure is more effective for ultra-thin active layers, which is very favorable for the exciton dissociation and charge collection. Therefore such a nanowall grating is expected to improve the overall performance of OPV devices. © 2014 Optical Society of America.

关键词： Light absorption

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Integrated inventory routing problem with quality time windows and loading cost for deteriorating items under discrete time

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Mathematical Problems in engineering 2014年第1期2014卷

作者： Jia, Tao Li, Xiaofan Wang, Nengmin Li, Ran School of Management Xi'An JiaoTong University No. 28 Xianning Road Xi'an Shaanxi 710049 China Key Lab of the Ministry of Education for Process Control and Efficiency Engineering No. 28 Xianning Road Xi'an Shaanxi 710049 China

We investigate an integrated inventory routing problem (IRP) in which one supplier with limited production capacity distributes a single item to a set of retailers using homogeneous vehicles. In the objective function we consider a loading cost which is often neglected in previous research. Considering the deterioration in the products, we set a soft time window during the transportation stage and a hard time window during the sales stage, and to prevent jams and waiting cost, the time interval of two successive vehicles returning to the supplier's facilities is required not to be overly short. Combining all of these factors, a two-echelon supply chain mixed integer programming model under discrete time is proposed, and a two-phase algorithm is developed. The first phase uses tabu search to obtain the retailers' ordering matrix. The second phase is to generate production scheduling and distribution routing, adopting a saving algorithm and a neighbourhood search, respectively. Computational experiments are conducted to illustrate the effectiveness of the proposed model and algorithm. © 2014 Tao Jia et al.

关键词： Costs

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The optimal promised quality defect model for service guarantees

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Computer Modelling and New Technologies 2014年第7期18卷 147-158页

作者： Wang, Wenlong Liu, Xinmei Zhang, Xiaojie School of Management Xi'an Jiaotong University 28 Xiannin Road Xi'an Shaanxi China The key lab of the Ministry of Education for Process Control and Efficiency Engineering 28 Xiannin Road Xian Shaanxi China

Service quality guarantee is an important tool for firms to boost demands, put up prices, and enhance profits. However, when promised quality defect is too high or low, the impact on the organization and the customer is usually negative. Therefore, determining the level of promised quality defect is of critical strategic and tactical importance in businesses. Yet, systematic quantitative methods aren't found to help managers determine promised quality defect. We propose a simple but powerful model in finding the optimal promised service quality defect. The model makes trade-offs between benefits and costs of service defect guarantees. Firstly, the decision of promised quality defect is analysed when service price is exogenous. We secondly investigated when service price is endogenous, how can a service provider make decisions on service price and promised quality defect simultaneously to maximize its profit. Thirdly, comprehensive analysis of how service providers promise the optimal quality defect from two aspects of demand and supply is given. Numerical analysis is conducted to illustrate the interactive effect of endogenous service price and affected service supply. In the end, we conclude the paper and suggest areas for future research. With only definitional changes, the model can be applied to other guarantee contexts.

关键词： Profitability

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