共查询到20条相似文献，搜索用时 156 毫秒
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介电弹性体是一种典型的智能软材料,具有高的介电常数,且具有重量轻、韧性好、形变大、高弹性能密度以及机电效率高等诸多优点.由介电弹性体制作而成的智能驱动器是通过具有柔性电极的弹性体在电场作用下产生的应变响应进行驱动变形的,在软体机器人、航空航天等许多方面展现出潜在的应用价值.然而,利用介电弹性体制备的抓取结构驱动力较小,将介电弹性体和形状记忆聚合物的变刚度特性相结合,可增加抓取结构的驱动力,并且在抓取和释放过程中无需持续通电即可固定形状.利用介电弹性体的电致变形特性和形状记忆聚合物的形状记忆及变刚度特性,设计了一种智能多稳态抓取结构.建立了驱动器的理论模型,确定结构参数,基于有限元软件对驱动结构的弯曲和恢复过程进行数值模拟,并对其进行弯曲和恢复试验,测试出恢复角度,基于理论和仿真对驱动器结构进行优化设计,基于优化后的驱动器制备了多稳态抓取结构,测试了抓取结构的性能. 相似文献
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李小聪 《牡丹江教育学院学报》2020,(1):38-40
“一体三翼九驱动”是以“实践创新能力”为体,以“思想品德立人、创新实践立业、知识技能立身”驱动目标,以“三级竞赛体系、三级课程体系、创新实践工作坊”驱动发展,以“多元实践师资、创新实践基地、考核激励体系”驱动资源,实现“目标价值—发展路径—资源保障”创新实践人才培养闭环体系。“一体三翼九驱动”型创新实践能力培养体系,是提高创新实践型人才培养质量、推动国家创新驱动发展战略的重要举措。 相似文献
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致电伸缩材料驱动智能气囊排气装置特征 总被引：3，自引：0，他引：3
本利用层叠电致伸缩驱动器设计了智能气囊排气装置，分析了其动态响应特性与缓冲驱动特性，并结合应用的需要进行了控制特性仿真。研究结果表明，该排气装置具有良好的驱动性能，可以满足智能气囊的排气控制要求。 相似文献
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提出利用数字散斑相关方法测量材料的电致伸缩性能的新方法.通过数字散斑相关方法得到面内位移,从而由几何三角关系得到离面位移,实现电致伸缩应变的测量.采用该方法对高电场作用下钛酸钡/聚氨酯复合高分子材料的电致伸缩性能进行了测量.在高电场作用下,对重复加电放电过程进行分析,得到电致伸缩应变,从而获取材料的电致伸缩系数.实验中采用双线性插值方法获取亚象素灰度值,以提高测量精度,并将结果与曲面拟合算法的计算结果进行了比较.结果表明:钛酸钡的加入提高了聚氨酯材料的电致伸缩性能;数字散斑相关方法可以有效地实现材料的电致伸缩系数的测量.该方法为电致伸缩性能的研究提供了一种有效的工具. 相似文献
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武子裕 《中阿科技论坛(中英文)》2024,(3):104-110
旋转驱动器在航天器上应用广泛。由于简单的驱动需求不需要结构过于复杂的驱动器,因此结构简单、性能可靠的旋转驱动器成为研究的热点。形状记忆合金（Shape Memory Alloy,SMA）驱动器结构简单紧凑、能量密度大、可靠性高、噪声低,拥有传统电机驱动器和液压驱动器所不具备的优势,是一种非常适合用于空间环境的驱动器。文章对一种非缠绕式轴向布置SMA丝的驱动器设计方案进行了设计与试验,分析了驱动器内部SMA丝的变形与受力情况,探讨了提升驱动器输出扭矩与行程的方法,并通过试验进行了验证;基于此设计了一种可以充当主动铰链的旋转驱动器,并通过试验验证了其驱动能力。 相似文献
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超磁致伸缩材料的热效应严重影响其控制精度.文章分析了超磁致伸缩器系统的热源,采用试验的方法确定了一定条件下的热应变和磁应变;设计了适合超磁致伸缩器的冷却子系统;基于热应变和磁应变试验曲线提出了软件向上补偿方法. 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献