权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Collaborative Research: Flying snakes: fluid mechanics of deforming articulated bodies

合作研究：飞蛇：关节体变形的流体力学

基本信息

批准号：
2027523
负责人：
Shane Ross
金额：
$ 31.99万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2024-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2027523&HistoricalAwards=false
关键词：
Collaborative Research Flying snakes fluid

项目摘要

There are numerous forms of flight ranging from the natural flapping of insect wings to engineered multi-rotor helicopters. Among the diversity of systems for producing flight forces, the flying snake embodies a highly unexpected and non-intuitive solution for aerial locomotion. With a cylindrical body, the snake has no extendable surfaces to create or control flight forces. Despite these limitations, the Asian arboreal species known as ‘flying’ snakes possess a surprisingly sophisticated ability to glide. These snakes jump from trees, flatten their body, and undulate in the air in a complex three-dimensional pattern to produce aerial locomotion. Most surprisingly, the snakes can actively maneuver in the air, capable of turning in mid-air under their own volition. Understanding how flying snakes achieve such feats is the first step toward duplicating this behavior in engineered devices, which could significantly advance design of robots in complex environments, with important applications to surveillance, search-and-rescue, and disaster monitoring. The aerial interaction physics of flying snakes - the strong coupling between the translational and rotational degrees of freedom of the snake as an articulated body - is largely unknown. This project will test the hypothesis that translational-rotational coupling is achieved through feedback between self-deformations (driven by undulation) and unsteady fluid mechanics. The research will use a combination of animal observations, experimental fluid mechanics, and computational fluid dynamics to reveal the fluid mechanics of deforming articulated bodies, of which the flying snake (genus Chrysopelea) is the prime example. The application of adaptive mesh refinement-based immersed boundary method to study fluid flows produced by gliding snakes will enable more efficient investigations on other complex fluids problems with dynamically moving objects across a wide range of Reynolds numbers. The proposed experimental and computational framework can potentially re-define the form and function of locomotion in fluid media for aerial and underwater robotic systems with enhanced mobility. The project involves a broad participation plan that will benefit a diverse range of groups. The principal investigators will engage under-represented students through programmatic connections to regional HBCUs, for summer undergraduate research as well as recruiting of graduate research assistants, at the three collaborating universities. Flying snakes excite the imagination of both students and the public, and the results of the experiments and computations will be disseminated both professionally and publicly, to media outlets and also directly to the public through social media.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

飞行的形式有很多种，从昆虫翅膀的自然拍动到工程设计的多旋翼直升机。在产生飞行力量的多种系统中，飞蛇体现了一种非常出乎意料且非直观的空中运动解决方案。由于蛇的身体呈圆柱形，因此没有可伸展的表面来产生或控制飞行力。尽管存在这些限制，被称为“飞蛇”的亚洲树栖物种却拥有令人惊讶的复杂滑行能力。这些蛇从树上跳下来，将身体压平，并以复杂的三维模式在空中波动，以产生空中运动。最令人惊奇的是，蛇可以在空中主动机动，能够根据自己的意志在半空中转弯。了解飞蛇如何实现此类壮举是在工程设备中复制这种行为的第一步，这可以显着推进复杂环境中机器人的设计，在监视、搜索和救援以及灾害监测方面具有重要应用。飞蛇的空中相互作用物理学——蛇作为铰接体的平移自由度和旋转自由度之间的强耦合——在很大程度上是未知的。该项目将测试以下假设：平移-旋转耦合是通过自变形（由波动驱动）和非定常流体力学之间的反馈来实现的。该研究将结合动物观察、实验流体力学和计算流体动力学来揭示铰接体变形的流体力学，其中飞蛇（金蛇属）就是最好的例子。应用基于自适应网格细化的浸没边界方法来研究滑行蛇产生的流体流动，将能够更有效地研究在各种雷诺数范围内动态移动物体的其他复杂流体问题。所提出的实验和计算框架有可能重新定义具有增强机动性的空中和水下机器人系统在流体介质中运动的形式和功能。该项目涉及广泛的参与计划，将使不同群体受益。主要研究人员将通过与地区 HBCU 的计划联系，吸引代表性不足的学生，在三所合作大学进行暑期本科生研究以及招聘研究生研究助理。飞蛇激发了学生和公众的想象力，实验和计算的结果将通过专业和公开的方式向媒体传播，也可以通过社交媒体直接向公众传播。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。