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Design concepts of an aircraft wing: composite and morphing airfoil with auxetic structures
P R BUDARAPU,Sudhir Sastry Y B,R NATARAJAN
《结构与土木工程前沿(英文)》 2016年 第10卷 第4期 页码 394-408 doi: 10.1007/s11709-016-0352-z
关键词: wing design aerodynamic loads morphing airfoil auxetic structures negative Poisson’s ratio
Deformation analysis of shape memory polymer for morphing wing skin under airflow
Weilong YIN, Jingcang LIU, Jinsong LENG,
《机械工程前沿(英文)》 2009年 第4卷 第4期 页码 447-449 doi: 10.1007/s11465-009-0062-5
关键词: aircraft morphing skin shape memory polymer (SMP) deformation pre-strain
Kinematical synthesis of an inversion of the double linked fourbar for morphing wing applications
J. AGUIRREBEITIA, R. AVILéS, I. FERNáNDEZ, M. ABASOLO
《机械工程前沿(英文)》 2013年 第8卷 第1期 页码 17-32 doi: 10.1007/s11465-013-0364-5
This paper presents the kinematical features of an inversion of the double linked fourbar for morphing wing purposes. The structure of the mechanism is obtained using structural synthesis concepts, from an initial conceptual schematic. Then, kinematic characteristics as instant center of rotation, lock positions, dead point positions and uncertainty positions are derived for this mechanism in order to face the last step, the dimensional synthesis; in this sense, two kinds of dimensional synthesis are arranged to guide the wing along two positions, and to fulfill with the second one some aerodynamic and minimum actuation energy related issues.
关键词: morphing wing structural synthesis dimensional synthesis geometrical kinematics
Structural design of morphing trailing edge actuated by SMA
Qi WANG, Zhiwei XU, Qian ZHU
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 268-275 doi: 10.1007/s11465-013-0261-y
In this paper, the morphing trailing edge is designed to achieve the up and down deflection under the aerodynamic load. After a detailed and accurate computational analysis to determine the SMA specifications and layout programs, a solid model is created in CATIA and the structures of the morphing wing trailing edge are produced by CNC machining. A set of DSP measurement and control system is designed to accomplish the controlling experiment of the morphing wing trailing edge. At last, via the force analysis, the trailing edge is fabricated with four sections of aluminum alloy, and the arrangement scheme of SMA wires is determined. Experiment of precise control integral has been performed to survey the control effect. The experiment consists of deflection angle tests of the third joint and the integral structure. Primarily, the ultimate deflection angle is tested in these two experiments. Therefore, the controlling experiment of different angles could be performed within this range. The results show that the deflection error is less than 4% and response time is less than 6.7 s, the precise controlling of the morphing trailing edge is preliminary realized.
关键词: morphing wing trailing edge shape memory alloy digital signal processor PID algorithm
Design and applications of morphing aircraft and their structures
《机械工程前沿(英文)》 2023年 第18卷 第3期 doi: 10.1007/s11465-023-0750-6
关键词: morphing aircraft additive manufacturing lattice structure smart material flexible structure flexible skin
Investigations on color variations of
Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI
《机械工程前沿(英文)》 2012年 第7卷 第4期 页码 394-400 doi: 10.1007/s11465-012-0347-y
Experiments and simulations are carried out to investigate the optical properties of butterfly wing scales. The upper surface of a male butterfly wing presents a single-layer of scales, the microstructures of which are responsible for the brilliant blue color. The color varies from cyan blue to yellow green and soon afterwards returns back to cyan blue when some ethanol is dropped on the upper surface. At the start of the ethanol volatilization process, the reflection spectrum remains stable. As the ethanol further volatilizes, the peak reflectance decreases slightly, then increases dramatically. Meanwhile, the peak wavelength keeps approximately constant, then decreases, and keeps almost stable at the end of the process. Therefore, the optical properties depend strongly on the varying ambient conditions, including the refractive index and the thickness of the packing medium. Moreover, the possible causes for the scales in dark green region after several dropping ethanol experiments are clarified. This research benefits our understanding of the color variation mechanisms of the wing scales, and provides inspiration for further studies and applications.
关键词:
Deformation characteristics of corrugated composites for morphing wings
Ruijun GE, Bangfeng WANG, Changwei MOU, Yong ZHOU,
《机械工程前沿(英文)》 2010年 第5卷 第1期 页码 73-78 doi: 10.1007/s11465-009-0063-4
关键词: corrugated composites deformation characteristic numerical analysis experiment
Module-based method for design and analysis of reconfigurable parallel robots
Fengfeng XI, Yuwen LI, Hongbo WANG
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 151-159 doi: 10.1007/s11465-011-0121-6
This paper presents a method for the design and analysis of reconfigurable parallel robots. The inherent modularity in a parallel robot lends itself as a natural candidate for reconfiguration. By taking the branches as building blocks, many modular parallel robots can be constructed, from which a reconfigurable parallel robot can be realized. Among three types of reconfigurations, namely, geometry morphing, topology morphing, and group morphing, the method presented here is for the last two reconfigurations, thereby advancing the current research that is mainly limited to geometry morphing. It is shown that the module-based method not only provides a systematic way of designing a reconfigurable parallel robot, but also offers a unified modeling for robot analysis. Two examples are provided, one showing the topology morphing and the other showing the group morphing.
关键词: reconfigurable parallel robot topology morphing group morphing
Modeling process-structure-property relationships for additive manufacturing
WAGNER, Wing Kam LIU
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 482-492 doi: 10.1007/s11465-018-0505-y
This paper presents our latest work on comprehensive modeling of process-structure-property relationships for additive manufacturing (AM) materials, including using data-mining techniques to close the cycle of design-predict-optimize. To illustrate the process-structure relationship, the multi-scale multi-physics process modeling starts from the micro-scale to establish a mechanistic heat source model, to the meso-scale models of individual powder particle evolution, and finally to the macro-scale model to simulate the fabrication process of a complex product. To link structure and properties, a high-efficiency mechanistic model, self-consistent clustering analyses, is developed to capture a variety of material response. The model incorporates factors such as voids, phase composition, inclusions, and grain structures, which are the differentiating features of AM metals. Furthermore, we propose data-mining as an effective solution for novel rapid design and optimization, which is motivated by the numerous influencing factors in the AM process. We believe this paper will provide a roadmap to advance AM fundamental understanding and guide the monitoring and advanced diagnostics of AM processing.
关键词: additive manufacturing thermal fluid flow data mining material modeling
恽良,邬成杰,谢佑农
《中国工程科学》 2000年 第2卷 第4期 页码 48-52
文章简要阐述了动力气垫地效翼船的空气-流体动力设计特点和难点,及“天鹅”号地效翼船的试验研究。由于采取一系列措施,使艇在静垫升性、两栖性、耐波性与气动力配平和运动稳定性等方面,在船模与实船上均取得令人满意的结果。
基于自组织映射的增材制造中数据驱动式微观组织和显微硬度设计 Article
Wagner, 曹简, Wing Kam Liu
《工程(英文)》 2019年 第5卷 第4期 页码 730-735 doi: 10.1016/j.eng.2019.03.014
为了在镍基高温合金的增材制造(AM)中设计微观组织和显微硬度,本研究提出了一种新的数据驱动方法,该方法结合了物理模型、实验测量和数据挖掘方法。该模拟基于计算热流体动力学(CtFD)模型,可以获得热行为、凝固参数(如冷却速度)和凝固层的稀释率。根据计算出的热信息, 可利用经过充分测试的力学模型估算枝晶臂间距和显微硬度。通过实验测定试样的微观结构和显微硬度,与模拟值进行比较验证。为了实现过程-组织-性能(PSP)关系的可视化,模拟及实验数据集被输入到数据挖掘模型——自组织映射(SOM)中。在多目标下,工艺参数的设计窗口可以从可视化映射中得到。这种被提出的方法可用于AM和其他数据密集型工艺过程。过程、组织和性能之间的数据驱动联系可能会有利于在线过程监控控制,从而获得理想的微观组织和力学性能。
高层建筑抗风智能幕墙 Article
丁菲, Ahsan Kareem
《工程(英文)》 2020年 第6卷 第12期 页码 1443-1453 doi: 10.1016/j.eng.2020.07.020
世界各地城市高层建筑的蓬勃发展使人们对其抗风性能提出了新要求。这涉及选择建筑外形使其风荷载最小化和有效传递荷载的结构拓扑形式。现行方法通常是在设计中寻找最优外形,但是会将其限定在静态或固定的建筑形式下。以台北101和哈利法塔的外形设计为例,气动外形修正通过修改建筑物的外观设计在减小风荷载和风致建筑物响应方面有很好的应用前景。在这些建筑物设计中,引入了横截面的倒角调整和锥度设计。除此之外,另一种引人注目的方案是设计一个能适应城市高楼林立复杂风环境变化的建筑,即设计动态立面。建筑形状的自主动态变形超越了传统静态形状优化设计,通过将传感、计算、传动装置和工程信息学融合在一起的信息物理系统而实现,并在本研究中进行了论证。新提出的方法将使建筑物能够智能地改变其轮廓,最大限度减弱动态风荷载激励,并有望通过利用计算设计的迅速发展,推动高层建筑设计从传统的静态立面转变为动态立面。
无人机仿射编队跟踪控制研究 Research Articles
李慧铭,陈浩,王祥科
《信息与电子工程前沿(英文)》 2022年 第23卷 第6期 页码 909-919 doi: 10.1631/FITEE.2100109
本文聚焦固定翼无人机集群仿射编队跟踪控制问题,其中固定翼无人机被建模为具有非对称速度约束的独轮车。无人机集群控制目标是生成并跟踪一个由名义编队仿射变换得到的时变目标编队。针对这一目标,在领航跟随者编队控制框架下,提出一种基于应力矩阵的分布式编队控制策略,并从理论上证明,跟随者在跟踪不同飞行轨迹的同时,能够收敛到由领航者位置决定的期望位置,实现编队队形的仿射变换。进一步,为满足固定翼无人机飞行速度约束,提出一种基于饱和函数的控制策略。数值仿真结果证实,所提仿射编队控制策略能有效提高机动性。
关键词: 仿射编队;固定翼无人机;多智能体系统
一种系统性制造3D打印患者匹配式颅颌面重建植入物的方法 Article
杜如虚, 苏宇雄, 颜瑜, 蔡颖珊, 杨伟发, 张春雨, 陈贤帅, Justin Paul Curtin, 欧阳江林, 张碧涛
《工程(英文)》 2020年 第6卷 第11期 页码 1291-1301 doi: 10.1016/j.eng.2020.02.019
通常,在头颈部外科中广泛应用的颅颌面重建植入物都被制造为标准样式。在手术过程中,医生必须手工弯折颅颌面重建植入物以匹配不同患者的骨骼解剖结构。弯曲植入物的过程非常耗时,尤其是对于一些缺乏经验的外科医生来说,很难操作。此外,反复的弯折可能会使得植入物内应力集中,在咀嚼载荷作用下易发生疲劳,最终导致植入物疲劳断裂、螺钉松动、骨吸收等并发症。目前已有一些关于3D打印颅颌面重建患者匹配式植入物的报道,但很少有人考虑到植入物的质量问题。在本文中,我们提出了一种制作颅颌面重建3D打印手术植入物的系统性方法。这一方法包括三个部分的内容:首先,我们基于SolidWorks®软件开发出一个容易使用的设计模块,该模块可帮助外科医生设计手术用颅颌面重建植入物及其辅助工具;设计工程师可以在此基础上进行更详细的设计,并借助有限元模拟来优化设计。接着,制造过程可分为三个步骤进行:第一步检测原材料粉末,第二步设置适当参数进行3D打印,第三步对3D打印产品进行后处理(即热处理和表面处理)以保证植入物的质量和性能。最后,对植入物进行成品检测和消毒后用于颅颌面重建手术中,术后再使用患者信息追踪软件辅助术后康复随访。采用这种方法,目前我们已成功完成了41例手术。3D打印患者匹配式植入物有很多优点,能减少手术时间,加快患者恢复。此外,本文提出的方法也有助于保证植入物的质量安全。
标题 作者 时间 类型 操作
Design concepts of an aircraft wing: composite and morphing airfoil with auxetic structures
P R BUDARAPU,Sudhir Sastry Y B,R NATARAJAN
期刊论文
Deformation analysis of shape memory polymer for morphing wing skin under airflow
Weilong YIN, Jingcang LIU, Jinsong LENG,
期刊论文
Kinematical synthesis of an inversion of the double linked fourbar for morphing wing applications
J. AGUIRREBEITIA, R. AVILéS, I. FERNáNDEZ, M. ABASOLO
期刊论文
Investigations on color variations of
Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI
期刊论文
Deformation characteristics of corrugated composites for morphing wings
Ruijun GE, Bangfeng WANG, Changwei MOU, Yong ZHOU,
期刊论文
Module-based method for design and analysis of reconfigurable parallel robots
Fengfeng XI, Yuwen LI, Hongbo WANG
期刊论文
Modeling process-structure-property relationships for additive manufacturing
WAGNER, Wing Kam LIU
期刊论文