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国家自然科学基金(50805110)

作品数:6 被引量:44H指数:3
相关作者:郭永献贾建援张大兴韩琪陈贵敏更多>>
相关机构:西安电子科技大学东南大学空军航空大学更多>>
发文基金:国家自然科学基金教育部科学技术研究重点项目中国博士后科学基金更多>>
相关领域:理学机械工程自动化与计算机技术建筑科学更多>>

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6 条 记 录,以下是 1-6
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考虑磁芯磁阻的微型磁器件吸合特性分析被引量:1
2009年
分析了不同类型电磁驱动微器件的吸合特性,将所得结果与前人的结果进行比较并讨论.结果表明:在磁动势控制模型中,竖直式结构和点式旋转式结构电磁驱动微器件具有相同的吸合特性.当磁芯磁阻与初始气隙磁阻之比m由0增大到2时,上述两类器件执行部分的吸合位移与气隙初始间距之比r由1/3线性增加到1;当m由0逐渐增大到12时,面式旋转式电磁驱动微器件的吸合角度与系统最大转角之比r1由0.4404逐渐增大到约0.6910,并且r1存在极限值约为0.7106;磁通控制情况下,磁芯磁阻对两类微型磁器件的吸合特性都无影响,其中竖直式和点式旋转式结构不存在吸合特性,而面式旋转式结构的r1始终不变,约为0.7106.
郭永献贾建援张大兴赵剑
关键词:电磁驱动
A 3-DOF Pseudo-Rigid-Body Model for Tension-Based Compliant Bistable Mechanisms被引量:1
2010年
Compliant bistable mechanisms, devices with two distinct stable equilibrium positions, are used in a variety of applications, such as switches, clasps, and valves. Many kinds of compliant bistable mechanisms were proposed and studied during the past decade. Among them, tension-based compliant bistable mechanisms, that incorporate tension pivots as their flexible members, feature in short travel distance and low power consuming. So far, the design of this kind of bistable mechanisms is done using finite element method through trial and error, thus is time-consuming. By treating the tension pivots as fixed-guided segments and their elongation as a spring, we developed a novel three degree-of-freedom (3-DOF) pseudo-rigid-body model (PRBM) for this kind of bistable mechanisms. The principle of virtual work is used to derive the force-deflection relationship of the PRBM model. The comparison between the PRBM results and the experimental results of the force-deflection characteristics shows that the PRBM can predict not only the bistable behavior of the tension-based bistable mechanisms, but also their soft spring-like post-bistable behavior and the spring-like force-deflection characteristics when pulling in the reverse direction from the as-fabricated position, which is called reverse behavior. The 3-DOF PRBM can be used to design and identify tension-based bistable mechanisms. Using the PRBM instead of the trial-and-error method can greatly reduce the development time of this kind of bistable mechanisms.
CHEN Guimin GAO Hongwei JIA Jianyuan
相关极值的重力匹配辅助导航被引量:6
2009年
对惯性、重力匹配组合导航算法进行了描述和分析,提出了一种新的基于相关极值的重力匹配辅助导航算法。该算法对数字重力图进行细化,运用约束条件在重力图寻值过程中有效地剔除了大量的干扰数据,改进并优化了基于相关极值的传统重力匹配算法。仿真结果表明,该算法将惯导数据误差由10^-2减小了1~3个数量级,较好地抑制了重力数据误差的影响并提高了匹配精度;将高达10^15的计算量减少到了10^7,大大提高了重力匹配的速度,达到了实时导航的目的;同时也有效地消除了厄缶(Eotvos)效应对重力匹配的影响,更适合于水下导航的实际需要。
夏冰王浩
关键词:组合导航
深切口椭圆柔性铰链被引量:27
2009年
提出了一类椭圆柔性铰链——深切口椭圆柔性铰链,其切口的宽度为椭圆的短半轴,而切口的深度为椭圆的长半轴。基于材料力学中的变截面梁的弯曲理论,通过引入离心角作为积分变量,推导出了这类柔性铰链的转角、转动精度和最大应力的解析计算公式。这些公式简洁、规范,可用于工程设计中的计算和分析。用有限元分析软件ANSYS分析了多个不同尺寸的椭圆柔性铰链,分析结果与解析计算公式的计算结果吻合得很好。其中转角的最大误差不超过4%,最大应力的最大误差不超过5%,转动精度的最大误差不超过7%,说明了这些解析计算公式的正确性。分析结果也表明,这类铰链非常适合于要求高精度传动的应用场合。
陈贵敏韩琪
关键词:柔度有限元法
Structural Synthesis of Compliant Metamorphic Mechanisms Based on Adjacency Matrix Operations被引量:9
2011年
A compliant metamorphic mechanism attributes to a new type of metamorphic mechanisms evolved from rigid metamorphic mechanisms. The structural characteristics and representations of a compliant metamorphic mechanism are different from its rigid counterparts, so does the structural synthesis method. In order to carry out its structural synthesis, a constraint graph representation for topological structure of compliant metamorphic mechanisms is introduced, which can not only represent the structure of a compliant metamorphic mechanism, but also describe the characteristics of its links and kinematic pairs. An adjacency matrix representation of the link relationships in a compliant metamorphic mechanism is presented according to the constraint graph. Then, a method for structural synthesis of compliant metamorphic mechanisms is proposed based on the adjacency matrix operations. The operation rules and the operation procedures of adjacency matrices are described through synthesis of the initial configurations composed of s+1 links from an s-link mechanism (the final configuration). The method is demonstrated by synthesizing all the possible four-link compliant metamorphic mechanisms that can transform into a three-link mechanism through combining two of its links. Sixty-five adjacency matrices are obtained in the synthesis, each of which corresponds to a compliant metamorphic mechanism having four links. Therefore, the effectiveness of the method is validated by a specific compliant metamorphic mechanism corresponding to one of the sixty-five adjacency matrices. The structural synthesis method is put into practice as a fully compliant metamorphic hand is presented based on the synthesis results. The synthesis method has the advantages of simple operation rules, clear geometric meanings, ease of programming with matrix operation, and provides an effective method for structural synthesis of compliant metamorphic mechanisms and can be used in the design of new compliant metamorphic mechanisms.
LI DuanlingZHANG ZhonghaiCHEN Guimin
电磁驱动微器件动态吸合特性分析
2009年
电磁驱动微型器件的吸合特性一般是基于准静态假设进行分析,所建立的模型与实际开关工作过程有偏差,因此建立更接近其实际工作情况的动态吸合模型,有助于指导开关器件的设计与控制.在忽略阻尼且考虑磁芯磁阻的情况下,以能量法为基础分析了阶跃磁动势驱动时两种器件的动态吸合特性.结果表明:竖直式结构的动态临界吸合位移值是准静态值的1.5倍,其产生动态吸合现象所需的阶跃磁动势幅值为准静态模型的91.9%;旋转式结构的动态临界吸合角度值比准静态模型值大29%到46%(随磁芯磁阻减小而增大),所需的临界阶跃磁动势幅值为准静态模型的91.2%.
郭永献贾建援张大兴
关键词:电磁驱动微驱动器吸合
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