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形状记忆合金是一种新型智能材料,具有大的磁致应变、驱动迅速、驱动力大、能够精确控制等优点,有望成为新一代驱动与传感材料。主要类比了传统温控形状记忆合金和新型磁控形状记忆合金的区别,综述了它们的工作原理及在驱动器方面的应用,对它们在驱动器方面的研究进行了总结和展望。 相似文献
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探讨了形状记忆合金在驱动器上的应用现状,阐述了形状记忆合金的疲劳概念,并分析了常见的形状记忆效应驱动器的工作机制及疲劳机理;对设计所需的TiNi形状记忆合金丝进行了相关的疲劳行为实验,为进一步的驱动器设计提供了理论指导。 相似文献
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以实例为模型分析了基于形状记忆合金驱动器的原理,以及各主要功能环节的实现方式。研究探讨了旋转驱动器的实现可能,并设计了基于三缸曲柄滑块机构的形状记忆合金旋转驱动器,拓宽了基于形状记忆合金驱动器的发展潜力和应用前景。 相似文献
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介绍了一种新型的形状记忆合金 (SMA)纤维驱动器 ,这一驱动器由预压缩弹簧连接的若干圆盘构成 ,圆盘周围对称编织多根 SMA纤维。依靠 SMA纤维的相变回复力与压缩弹簧的弹力完成驱动器的往复动作。这一结构有效地克服了 SMA的主要缺点 :形变较小 ,使驱动器的力与位移之间的转换更加高效。还给出了一种仿真模型 ,可以评价一给定驱动器的特性 ,同时也可在给定驱动器的力、位移、速度等条件下决定该驱动器的几何结构。最后 ,对单个驱动器与差动排列的驱动器对的实验和仿真结果进行了分析 相似文献
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人与机器人实现动态耦合的重要接口 总被引:2,自引:0,他引:2
介绍了最近研制的由两个RRRRRR型机械臂构成的具有12个自由度的主机械手的基本和之构成了五套遥操作实验系统,对其性能进行了测试。在实验的基础上,对这种主机械手作为一种重要的人机接口的应用范围进行了探讨。 相似文献
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基于多模-单模-多模结构和光纤布拉格光栅同时测量温度和折射率 总被引:4,自引:1,他引:3
利用单模光纤(SMF)中的包层模与纤芯导模之间的干涉,提出了一种基于多模-单模-多模(MSM)结构与布拉格光栅(FBG)级联可同时测量温度和折射率的传感器.基于MSM结构的干涉谱和FBG的透射峰对温度和折射率具有不同响应灵敏度的特点,利用敏感矩阵实现了对温度和折射率的同时测量.实验测得MSM结构和FBG的温度灵敏度分别为0.055 2 nm/℃和0.015 8 nm/℃,MSM结构的折射率灵敏度为109.702 nm/RIU,而FBG对折射率变化不敏感.温度和折射率的测量精度分别为士0.32℃和士0.002 3.实验显示提出的MSM结构的温度灵敏度比单模-多模-单模(SMS)结构传感器提高了5倍,同时由于SMF中的包层模对外界环境的变化较敏感,该MSM结构也可应用于其他传感领域. 相似文献
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Shing-Ko Liang Chia-Nan Wang 《The International Journal of Advanced Manufacturing Technology》2005,26(5-6):645-652
The more accurate the forecast is to lot delivery time, the more effective it is in fab scheduling. In fab operations, scheduling is the major impact factor of tools capacity allocation, tools utilization control and bottleneck management. However, there is no effective method to estimate delivery time in 300 mm automatic material handling systems (AMHS) operation. Computer simulations are authentic, but they are either too complex to model fab operations as well as the whole AMHS, or too time-consuming to simulate with a full-scaled fab model. This paper proposes an analytic methodology to estimate the loop-to-loop delivery time for differentiated lots in a 300 mm AMHS environment. Combining simulation and statistics techniques, we develop a modularized simulation method (MSM) for delivery time forecast of priority lots. Numerical experiments based on data from a local 300 mm manufacturing fab are conducted. Simulation demonstrates that the MSM has credible results in estimating lot delivery times. The time differences between MSM and simulation for both priority lots and regular lots are 0.2 s and 0.1 s, respectively. Using the MSM method to forecast AMHS delivery time is a great contribution for streamlining shop floor operations, such as scheduling and dispatching, for eliminating time delays in the 300 mm automatic environment. 相似文献
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Shing-Ko Liang Chia-Nan Wang 《The International Journal of Advanced Manufacturing Technology》2005,26(5):645-652
The more accurate the forecast is to lot delivery time, the more effective it is in fab scheduling. In fab operations, scheduling is the major impact factor of tools capacity allocation, tools utilization control and bottleneck management. However, there is no effective method to estimate delivery time in 300 mm automatic material handling systems (AMHS) operation. Computer simulations are authentic, but they are either too complex to model fab operations as well as the whole AMHS, or too time-consuming to simulate with a full-scaled fab model. This paper proposes an analytic methodology to estimate the loop-to-loop delivery time for differentiated lots in a 300 mm AMHS environment. Combining simulation and statistics techniques, we develop a modularized simulation method (MSM) for delivery time forecast of priority lots. Numerical experiments based on data from a local 300 mm manufacturing fab are conducted. Simulation demonstrates that the MSM has credible results in estimating lot delivery times. The time differences between MSM and simulation for both priority lots and regular lots are 0.2 s and 0.1 s, respectively. Using the MSM method to forecast AMHS delivery time is a great contribution for streamlining shop floor operations, such as scheduling and dispatching, for eliminating time delays in the 300 mm automatic environment. 相似文献
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A study of the flexible job shop scheduling problem with parallel machines and reentrant process 总被引:3,自引:3,他引:0
J. C. Chen K. H. Chen J. J. Wu C. W. Chen 《The International Journal of Advanced Manufacturing Technology》2008,39(3-4):344-354
This paper develops a scheduling algorithm for the job shop scheduling problem with parallel machines and reentrant process. This algorithm includes two major modules: the machine selection module (MSM) and the operation scheduling module (OSM). An order has several jobs and each job has several operations in a hierarchical structure. The MSM helps an operation to select one of the parallel machines to process it. The OSM is then used to schedule the sequences and the timing of all operations assigned to each machine. A real-life weapons production factory is used as a case study to evaluate the performance of the proposed algorithm. Due to the high penalty of delays in military orders, the on-time delivery rate is the most important performance measure and then makespan is the next most important measure. Well-known performance measures in the scheduling literature, such as maximum lateness and average tardiness, are also evaluated. The simulation results demonstrate that the MSM and OSM using the combination of earliest due date (EDD), the operations’ lowest level code (LLC) of the bill of materials (BOM), and the longest processing time (LPT) outperforms the other scheduling methods. 相似文献
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Fixed-quantity dynamic lot sizing using simulated annealing 总被引:1,自引:1,他引:0
Lotfi K. Gaafar Ashraf O. Nassef Ahmed I. Aly 《The International Journal of Advanced Manufacturing Technology》2009,41(1-2):122-131
In this paper, simulated annealing (SA) is applied to the deterministic dynamic lot-sizing problem with batch ordering and backorders. Batch ordering requires orders that are integer multiples of a fixed quantity that is larger than 1. The performance of the developed SA heuristic is compared to that of a genetic algorithm (GA) and a modified silver-meal (MSM) heuristic developed in the literature, based on the frequency of obtaining the optimum solution and the percentage average deviation from the optimum solution. In addition, the effects of three factors on the performance of the SA, GA, and the MSM are investigated in a 23 factorial experiment. The investigated factors are the demand pattern, the batch size, and the length of the planning horizon. Results indicate that the SA heuristic has the best performance, followed by GA, in terms of the frequency of obtaining the optimum solution and the average deviation from the optimum solution. SA is also the most robust of the investigated heuristics as its performance is only affected by the length of the planning horizon. 相似文献
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Didik Yu. I. Korzunin G. S. Didik M. Yu. 《Russian Journal of Nondestructive Testing》2001,37(7):453-462
The modern technological level and trends of the development of magnetic techniques for measuring properties of magnetically soft materials (MSM) used in setups in whose cores magnetization is reversed in the pulsed regime have briefly been reviewed. A setup for measuring magnetic properties of MSM in a pulsed remagnetization regime for the pulse duration of 1–100 s and the magnetic flux of 10–8–10–5 Wb is described. 相似文献
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输入排队调度算法就是通过获得路由器输入输出端口的最大匹配从而达到提高吞吐量的目的。在调度算法理论研究中可以采用二部图最大匹配的MSM和MWM算法作为各种调度算法性能的评价标准。匈牙利算法是二部图匹配的经典算法,将匈牙利算法应用到输入排队调度算法中,得出了典型算法MSM和MWM的性能仿真曲线,为未来高性能路由器的设计提供了依据。 相似文献
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基于PSTN的远程智能终端的设计 总被引:1,自引:0,他引:1
介绍了一种基于公用交换电话网(PSTN)的远程智能终端的结构和工作原理,提出了由单片Modem MSM7512B和双音多频(DTMF)MT8888建立远程数据通信的方法,实现了对现场设备运行状态的检测、控制和远程管理等功能。 相似文献