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Experimental Study on the Dam-Break Hydrographs at the gate location

Journal of Ocean University of China 2017年第4期16卷 697-702页

作者： LIU Hui LIU Haijiang GUO Liheng LU Senxun Ocean College Zhejiang University Hangzhou 310058 P R. China College of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 P R. China

When studying the dam-break flow phenomenon,the basic hydrodynamic features of the dam-break flow at the gate location should be verified *** this study,laboratory experiments were performed in a rectangular and horizontal flume with the same initial water head setting on the dry and wet downstream bed *** surface elevation was extracted through image analysis and validated by comparing with the data measured using a wave *** variation of the water surface elevation at the gate location,quantified in terms of high-speed video recorded images,can be divided into three stages,the sharp decreasing stage,the relatively steady stage,and the gradually decreasing *** of several classic analytical solutions of the dam-break problem at the gate location was validated using present experimental ***'s solution is effective for the dry bed condition while Stoker's solution could be applied to the wet bed case,and both are only applicable during the steady ***' solution reproduces the gate-site hydrographs well during both the relatively steady and the gradually decreasing stages,especially for the condition under which the down-upstream water depth ratio is smaller than 0.138.

关键词： dam-break experiment hydrograph gate location image analysis three stages

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Single gate optimization for plastic injection mold

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1077-1083页

作者： LI Ji-quan LI De-qun GUO Zhi-ying LV Hai-yuan Department of Plasticity Technology Shanghai Jiao Tong University Shanghai 200030 China

This paper deals with a methodology for single gate location optimization for plastic injection mold. The objective of the gate optimization is to minimize the warpage of injection molded parts, because warpage is a crucial quality issue for most injection molded parts while it is influenced greatly by the gate location. Feature warpage is defined as the ratio of maximum displacement on the feature surface to the projected length of the feature surface to describe part warpage. The optimization is combined with the numerical simulation technology to find the optimal gate location, in which the simulated annealing algorithm is used to search for the optimum. Finally, an example is discussed in the paper and it can be concluded that the proposed method is effective.

关键词： Injection mold gate location Optimization Feature warpage

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维普期刊数据库

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Study of Asymmetric Polling System with Two Message Classes

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Journal of Beijing Institute of Technology 2007年第2期16卷 182-186页

作者：曹春生张卫东 Department of Automation Shanghai Jiaotong University

A novel mixed polling system with multiple stations is considered. Each station produces two classes of messages served with different disciplines. The real time message served with exhaustive service discipline and the unreal time message served with gated service discipline. Using an iterative method, the exact mean waiting times for both message classes are derived. The influence of the gate location of the message class served by the gated service discipline on the mean waiting time is also analyzed. The analytical results are verified with simulation method and agree well with simulation results.

关键词： mean waiting time message class gate location polling system

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