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1.
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   

2.
磁控形状记忆合金(MSMA)是一种新型智能材料。该类材料具有磁控形状记忆效应(MSME)、变形率和力能密度大、动态响应速度快、线性度好以及易于控制等优点。针对MSMA输入/输出的非线性特点,论述了磁场诱发的磁控形状记忆效应、应力诱发的伪弹性效应以及温度诱发的形状记忆效应。总结了块体、薄膜MSMA在微位移执行器领域的国内外研究及应用现状,并对MS-MA微位移执行器的未来应用趋势进行了分析。研究结果表明,MSMA驱动器是微位移执行器领域中最为重要的驱动方式之一。  相似文献   

3.
磁控形状记忆合金(MSMA)固有的磁滞非线性特性严重影响了MSMA驱动器定位精度,以Ni2MnGa磁控形状记忆合金为研究对象,利用MSMA多场耦合系统进行实验,控制实验温度和磁场强度,记录外加应力、温度、磁场强度及MSMA应变等实验数据。在Ansys Maxwell软件中进行MSMA驱动装置模型磁路的电磁场仿真,得到最佳的耦合磁场强度。结合实验数据,运用能量守恒定律和热力学理论,构建MSMA多场耦合模型,预测了多场耦合变量曲线,得到MSMA驱动器工作的最佳耦合条件,为MSMA驱动器高精度定位提供了理论依据。  相似文献   

4.
提出了一种新型结构形式的形状记忆合金驱动器——内嵌式形状记忆合金驱动器。该驱动器将U形回复形状记忆合金丝嵌入弹性硅胶棒内,通过温控方式实现驱动器的往复可逆弯曲运动,对外稳定输出力和位移。研究了驱动器运行机理,探讨了基于形状记忆合金电阻反馈的变结构滑模控制策略,进行了仿真和实验研究。  相似文献   

5.
王家海  刘睿智 《机电一体化》2009,15(5):96-97,101
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   

6.
为了消除或减小磁滞非线性特性对磁控形状记忆合金驱动器定位精度的影响,应用BP神经网络建立了磁控形状记忆合金驱动器磁滞模型。针对BP网络算法存在的不足,以及网络结构、初始连接权值和阈值的选择对BP网络训练的影响很大等问题,提出一种混合遗传算法对神经网络磁滞模型的权值和阈值进行优化。将优化后的参数赋值给BP神经网络重新训练,结果表明,优化后的磁滞模型训练误差绝对值由25nm减小到5nm,有较好的收敛性。  相似文献   

7.
图仕捷  孙海谛 《机电一体化》2010,16(4):55-57,91
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   

8.
基于磁控形状记忆合金(MSMA)直线执行器的研究,提出了基本式和差动式两种类型的MSMA旋转执行器。分别介绍了两种执行器的工作原理、结构和控制策略,推导了执行器的位移和转速公式,绘制出了MSMA元件的相对磁导率与磁通密度的关系曲线。在磁场有限元分析的基础上设计并研制了旋转执行器样机,比较了不同结构和不同控制策略下样机的实验速度曲线。样机的实验结果验证了MSMA旋转执行器工作机理的正确性和设计方法的可行性。  相似文献   

9.
杨凯  辜承林 《机械科学与技术》2001,20(3):359-360,363
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   

10.
分析了微机械变形镜MEMS驱动器的种类及其特点,并在磁致伸缩薄膜具有低磁场下的大形变、低功耗、高响应速度等特性基础上,提出了超磁致伸缩薄膜MEMS驱动器的原理.由于TbFe磁致伸缩薄膜在外加磁场作用下,微桥将在水平方向上产生伸长变形,从而引起微桥在垂直方向上发生位移.根据这一原理,设计了一种用于微机械变形镜MEMS驱动器的超磁致伸缩薄膜驱动结构,同时提出制作磁致伸缩薄膜连续式微机械变形镜的工艺流程.  相似文献   

11.
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   

12.
远距离水位智能监控系统的研究与实现   总被引:7,自引:0,他引:7  
介绍一种基于单片机 AT89C2 0 5 1和调制解调器 MSM75 12 B的远距离智能水位监控系统。该系统以普通电话线为通信线路 ,实现了相距 11km的蓄水池与水库泵站间水位数据的实时传输、数字显示和自动控制。  相似文献   

13.
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   

14.
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   

15.
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   

16.
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   

17.
Fixed-quantity dynamic lot sizing using simulated annealing   总被引:1,自引:1,他引:0  
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   

18.
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   

19.
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   

20.
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   

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