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Development of single-action,two-step clinching system using finite element analysis

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中国有色金属学会会刊：英文版 2009年第B09期19卷 266-270页

作者： Seong-Wook LEE Tae-Hyung KIM Geun-Jo HAN Power & industrial systems R&D Center Hyosung Corporation Department of Mechanical engineering Department of Mechanical engineering Dong-A University

Traditional manufacturing processes for bending and combining the upper and lower heat insulation plates for a car catalytic converter need two kinds of bending dies. This study was carried out to develop a single-action, two-step clinching system for clinching heat insulation plates. To design the operating mechanism for this clinching system, finite element analysis was used to estimate the bending load needed and to predict the bent shape of the heat insulation plate. Then a recovery and cushioning system was designed for the bending die. It is expected that this new process will improve the manufacturing quality of heat insulation plates and will reduce manufacturing cost. And a higher value-added technique for mold and pressing systems was introduced.

关键词：缓冲系统有限元分析开发汽车催化转化器单动模具技术隔热板板弯曲

A CASE STUDY FOR ADVANCED PLANNING AND SCHEDULING (APS)

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Journal of systems Science and systems engineering 2011年第4期20卷 460-474页

作者： Kejia CHEN Ping Jl Qing WANG School of Management Fuzhou University Fuzhou 350108 China Department of industrial and systems engineering The Hong Kong Polytechnic University Hong Kong Department of systems engineering Northeastern University Shenyang 110819 China

This paper presents a case study for the advanced planning and scheduling （APS） problem encountered in a light source manufacturer. The APS problem explicitly considers due dates of products, operation sequences among items, and capacity constraints of the manufacturing system. The objective of the problem is to seek the minimum cost of both production idle time and tardiness or earliness penalty of an order. An intelligent heuristic is applied to the problem, and the results demonstrate that significant production performances can be achieved while ensuring customer satisfaction as opposed to normal oractices followed in the company relying on human expertise.

关键词： Advanced planning and scheduling case study intelligent heuristic

Signal difference-based deadband H_∞ control approach for networked control systems with limited resources

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Journal of systems engineering and Electronics 2015年第3期26卷 573-583页

作者： Yingying Liu Weiwei Che Yunkai Chu School of Information engineering Shenyang University Key Laboratory of manufacturing industrial Integrated Automation Shenyang University Shenyang Institute of Automation Chinese Academy of Sciences

This paper investigates a signal difference-based dead- band H∞ control approach for networked control systems （NCSs） with limited resources. The effects of variable network-induced de- lays, sampling intervals and data transmitting deadbands are con- sidered simultaneously and the model of the NCS is presented. A Lyapunov functional is adopted, which makes full use of the network characteristic information including the bounds of net- work delay （BND）, the bounds of sampling interval （BSI） and the bounds of transmission deadband （BTD）. In the meanwhile, the new H∞ performance analysis and controller design conditions for the NCSs are proposed, which describe the relationship of BND, BSI, BTD and the system＇s performance. Three examples are used to illustrate the advantages of the proposed methods. The results have shown that the proposed method not only effectively reduces the data traffic, but also guarantees the system asymptotically sta- ble and achieves the prescribed H∞ disturbance attenuation level.

关键词： networked control system (NCS) H∞ control vari-able network-induced delay variable sampling interval transmission deadband.

A comprehensive review of dwell time optimization methods in computer-controlled optical surfacing

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Light(Advanced manufacturing) 2024年第3期5卷 142-171页

作者： Tianyi Wang Xiaolong Ke Lei Huang Qingqing Cui Zili Zhang Chunjin Wang Hyukmo Kang Weslin Pullen Heejoo Choi Daewook Kim Vipender Negi Qian Kemao Yi Zhu Stefano Giorgio Philip Boccabella Nathalie Bouet Corey Austin Mourad Idir National Synchrotron Light Source II(NSLS-II) Brookhaven National LaboratoryP.O.Box 5000UptonNY 11973USA School of Mechanical and Automotive engineering Xiamen University of TechnologyXiamen 361024China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial Systems and EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina James C.Wyant College of Optical Sciences University of Arizona1630 E.University Blvd.P.O.Box 210094TucsonAZ 85721-0094USA Large Binocular Telescope Observatory University of ArizonaTucsonAZ 85721USA Department of Astronomy and Steward Observatory University of Arizona933 N.Cherry Ave.TucsonAZ85721USA Indian Institute of Technology Delhi Hauz KhasNew Delhi 110016India School of Computer Science and engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798

Dwell time plays a vital role in determining the accuracy and convergence of the computer-controlled optical surfacing ***,optimizing dwell time presents a challenge due to its ill-posed nature,resulting in non-unique *** address this issue,several well-known methods have emerged,including the iterative,Bayesian,Fourier transform,and matrix-form *** their independent development,these methods share common objectives,such as minimizing residual errors,ensuring dwell time's positivity and smoothness,minimizing total processing time,and enabling flexible dwell *** paper aims to comprehensively review the existing dwell time optimization methods,explore their interrelationships,provide insights for their effective implementations,evaluate their performances,and ultimately propose a unified dwell time optimization methodology.

关键词： Dwell time optimization Computer-controlled optical surfacing Finishing Polishing Optical fabrication

Network design for local agriculture using robust optimization

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Information Processing in Agriculture 2021年第3期8卷 469-483页

作者： Ashish Kambli Ronald G.McGarvey Department of industrial and manufacturing systems engineering University of MissouriColumbiaMO 65211United States Harry S Truman School of Public Affairs University of MissouriColumbiaMO 65211United States

For small farmers wishing to sell their products under the “local agriculture”marketing con-cept,connecting with consumers can be *** approach to mitigating this discon-nect between where production occurs and where consumers reside is through a network of regional consolidation *** this study,we utilize optimization models to assist the Mis-souri Coalition of Environment(MCE)in helping farmers from Missouri and Illinois route products from their farms to a central hub in *** aim of this study was to minimize the ton-miles traveled by farmers and MCE vehicles in delivering agricultural products from farms to regional hubs to the central *** historical data about variability of plant and animal production in the Greater Plains region,a robust optimization approach was incorpo-rated to increase the likelihood that the network can accommodate uncertainty in agricul-tural ***/CPLEX was used to solve the model under different configurations and identify potential locations for regional *** testing determined that the capacity of hubs plays a key role in the optimal assignments:given the assumed model constraint that farmers can travel only to their nearest regional hub,solutions may sacrifice a better objective function value in order to accommodate farmers’travel requirements.

关键词： Optimization Robustness and sensitivity analysis Supply chain management

Ultrasonic-Vibration-Assisted Pelleting of Switchgrass:Effects of Ultrasonic Vibration

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Transactions of Tianjin University 2011年第5期17卷 313-319页

作者：丛威龙裴志坚张鹏飞秦娜 DEINES T W 林彬 Department of industrial and manufacturing systems engineering Kansas State University Manhattan KS 66506 USA Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China

Biofuels produced from cellulosic biomass can be used to replace petroleum-based transportation fuels. However, the manufacturing cost of cellulosic biofuels is still high, partly due to the low density of cellulosic feed-stocks. Pelleting of cellulosic feedstocks can increase their density, making their transportation and storage as well as biofuel conversion more efficient and, therefore, reducing the overall cost of biofuel manufacturing. It has been shown that ultrasonic-vibration-assisted (UV-A) pelleting, without using high-temperature steam and binder materials, can produce pellets with density comparable to that produced by conventional pelleting methods. Furthermore, the sugar yield of biomass (wheat straw) processed with UV-A pelleting is 20% higher than that of biomass pelleted without ultrasonic vibration. This paper reports an experimental investigation of UV-A pelleting of switchgrass. The influences of ultrasonic vibration on pellet density, stability, durability, and pelleting force are discussed. It is concluded that pellets processed with ultrasonic vibration had higher density and stability than those processed without ultrasonic vibration, they were more durable than those processed without ultrasonic vibration, and pelleting force with ultrasonic vibration was lower than that without ultrasonic vibration.

关键词： biofuel cellulosic biomass pelleting switchgrass ultrasonic vibration

Dynamic appointment scheduling for outpatient clinics with multiple physicians and patient choice

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Journal of Management Science and engineering 2022年第1期7卷 19-35页

作者： Chongjun Yan George G.Q.Huang Yong-Hong Kuo Jiafu Tang College of Management Science and engineering Dongbei University of Finance and EconomicsDalian116025China Department of industrial and manufacturing systems engineering The University of Hong KongHong KongChina

Mitigating the adverse effects of uncertainty in appointment systems,arising from heterogeneous patient needs and preferences,is critical to the effective use of scarce medical resources and patient *** study addresses an online scheduling problem with multiple servers and consideration of patient preference for physicians and their appointment *** receptionist immediately determines whether a request should be accommodated and offers an appointment time slot for each accepted patient *** patient may reject an undesirable appointment time slot with a certain probability,or may accept it,but the no-show probability will be higher.A stochastic overbooking model is formulated to maximize the expected profit,which is defined as the revenue generated from accepted requests minus the cost incurred by patients waiting and physicians’overtime.A myopic scheduling policy is developed based on certain structural properties of the objective *** study advances the study of appointment systems by generating a non-unimodal profit ***,both the decision of accommodating more requests for certain slots and the scheduling of appointments depend on the patient choice rather than the patient ***,computational experiments and analysis offer valuable insights into performance improvement in outpatient clinics.

关键词： Applications in healthcare systems Dynamic scheduling Stochastic models Patient choice Multiple physicians

Critical transitions in the shape morphing of kirigami metallic glass

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Journal of Materials Science & Technology 2021年第2期61卷 204-212页

作者： D.X.Han L.Zhao S.H.Chen G.Wang K.C.Chan Advanced manufacturing Technology Research Center Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HornKowloonHong KongChina School of Mechanical engineering Hefei University of TechnologyHefei230009China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai200444China

Kirigami, the ancient Japanese paper cutting technique, has been applied to achieve high stretchability and low energy loss of designed metallic glass. Despite the exploration of the underlying deformation mechanism of kirigami-inspired structures from the energy point of view, the morphable responses of the kirigami patterns and the origin of the kirigami response are yet to be fully understood. This study reveals the mechanical driven-forms of the kirigami structure with the corresponding deformation stages. Based on the beam deflection theory, the elastic buckling behavior of kirigami metallic glass is manifested and a critical force prediction model is developed. Moreover, a force concentration parameter is introduced in the rigid-plastic deformation stage, predicting the nominal ultimate force. The kirigami-inspired facture force is firstly proposed. The findings of these models are in good agreement with the experimental sizedependent kirigami responses, and expected to provide significant insights into the understanding of the deformation behavior and the design of kirigami metallic glasses.

关键词： Metamaterial Kirigami metallic glass Critical load Size effect Beam deflection

An Improvement to Multiple Criteria ABC Inventory Classification Using Shannon Entropy

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Journal of systems Science & Complexity 2017年第4期30卷 857-865页

作者： ZHENG Shanshan FU Yelin LAI Kin Keung LIANG Liang School of Public Affairs University of Science and Technology of China Department of industrial and manufacturing systems engineering University of Hong Kong School of Finance Jiangxi University of Finance and Economics International Business School Shaanxi Normal University School of Management Hefei University of Technology

This paper extends the Ng-model [Ng, 2007] for multiple criteria ABC inventory classification based upon Shannon entropy. The proposed approach determines the common weights associated with all criteria importance rankings, and provides a comprehensive scoring scheme by aggregating all rankings of the criteria importance. A numerical illustration is presented to compare the model with previous studies.

关键词： Inventory multiple criteria analysis Shannon entropy.