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91.
A dispatching method is suggested for automated guided vehicles by using an auction algorithm. The dispatching method in
this study is different from traditional dispatching rules in that it looks into the future for an efficient assignment of
delivery tasks to vehicles and also in that multiple tasks are matched with multiple vehicles. The dispatching method in this
study is distributed in the sense that the dispatching decisions are made through communication among related vehicles and
machines. The theoretical rationale behind the distributed dispatching method is also discussed. Through a simulation study,
the performance of the method is compared with that of a popular dispatching rule.
RID="*"
ID="*" The research was financially supported by the Sasakawa Scientific Research Grant from The Japan Science Society. The
original version of the simulation program is provided by Professor Jae Yeon Kim at Dong Yang University, Korea.
Correspondence to: J. K. Lim 相似文献
92.
Malay Ganai Praveen Yalagandula Adnan Aziz Andreas Kuehlmann Vigyan Singhal 《Journal of Electronic Testing》2001,17(1):11-27
We introduce SImulation Verification with Augmentation (SIVA), a tool for coverage-directed state space search on digital hardware designs. SIVA tightly integrates simulation with symbolic techniques for efficient state space search. Specifically, the core algorithm uses a combination of ATPG and BDDs to generate directed input vectors, i.e., inputs which cover behavior not excited by simulation. We also present approaches to automatically generate lighthouses that guide the search towards hard-to-reach coverage goals. Experiments demonstrate that our approach is capable of achieving significantly greater coverage than either simulation or symbolic techniques in isolation. 相似文献
93.
In real transportation environments for semi-conductor manufacturing, unexpected disturbances such as motion delays and/or sudden requests for transportation may cause collisions among AGVs increasing total transportation time. It is required to generate a collision-free routing for multiple automated guided vehicles (AGVs) within a few seconds. In this paper, we propose a distributed routing method under motion delay disturbance for multiple AGVs. The proposed method features a characteristic that each AGV subsystem derives its optimal route to minimize the sum of the transportation time and the penalties with respect to collision probability with other AGVs. The penalties reflect the collision probability distribution function for motion delay disturbances. The proposed method is applied to a routing problem for transportation in the semiconductor fabrication bay with 143 nodes and 20 AGVs. The computational results show that the total transportation time obtained by the proposed method is shorter than that of the conventional method. For dynamic transportation environments, an optimal timing for re-routing multiple AGVs under motion delay disturbance is systematically determined by the tradeoff relationship between the total computation time to derive a solution and the uncertainties for re-routings. Markov chain is used to represent uncertainty distribution for re-routings. The proposed method is implemented in an experimental transportation system with 51 nodes and 5 AGVs. The experimental results demonstrate that the proposed method is applicable to real transportation environments. 相似文献
94.
We consider an automated storage/retrieval system in which cargo moves between the storage/retrieval machines and the system
entrance/exit stations through a single automated vehicle loop. Past studies indicated that the cargo waiting time in the
loop is affected by the dispatching rules, which govern the sequence of the cargo to be handled. In this paper, we show that
the loop configuration, which has received little research attention, also has a big impact on the cargo waiting time. When
the first-come-first-served dispatching rule is used, we derive the relationship between the number of stations and the ratio
of the average cargo retrieval time to the average cargo storage time. When the first-encountered-first-served dispatching
rule is used, we show that even the arrangement of the input channel and the output channel of a station can have significant
impact on the cargo waiting time. Furthermore, we derive a formula for the vehicle visit rate for each station under heavy
traffic conditions. This formula helps to explain the phenomenon that the waiting times at different stations can be very
different even when the loop is symmetrically designed and the cargo arrival rates to the stations are similar. In addition
to analytical models, we use simulations to evaluate the performance of different loop configurations. Our research suggests
that a substantial improvement can be achieved by making proper adjustments to the loop configuration. 相似文献
95.
降低第三、四代精确制导武器由研制向生产过渡的风险,按期向用户交付优质合格的产品,及早装备部队,形成战斗力,是国内多数军工企业面临的共同挑战。机载精确制导武器装备型号研制的成功并不意味着生产的成功。本文通过研究并识别影响研制向生产过渡过程中存在的十种风险因素,找出相应的八种解决方法及对策,探索了降低研制向生产过渡风险的有效途径。 相似文献
96.
激光末制导炮弹故障分析 总被引:1,自引:0,他引:1
激光末制导炮弹属精确打击弹药,越来越受到重视。文中对激光末制导炮弹的主要故障现象进行了系统分析、定位,梳理故障发生的机理和原因及改进方向,为进一步提高激光末制导炮弹的质量水平和战斗效能提供了指导。 相似文献
97.
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100.
连接结构是大型复合材料结构的关键环节,对保证复合材料结构的完整性具有重要作用。由于复合材料连接结构存在复杂的非线性耦合因素,使得复合材料连接结构的强度和破坏模式分析十分困难,因此,必须对复合材料连接结构的健康状态进行监测、诊断、评价和预测,通过在线监测获得的信息实时掌握结构的健康状况与对外界载荷的响应,并在此基础上对未来可能发生的缺陷和故障进行预报,以便能在合适时间段内采取措施,以保证复合材料结构的安全服役并取得最大的经济效益。以飞行器复合材料连接结构为背景,首先简要分析了复合材料胶接连接、机械连接和混合连接形式的损伤和失效模式,然后重点介绍了基于波传播法、阻抗法、智能涂层监测法、真空比较监测法、光纤传感监测法和混合集成监测法的复合材料连接结构健康监测(SHM)技术的研究进展,最后讨论了飞行器复合材料连接结构健康监测技术的发展趋势和面临的挑战。 相似文献