CAREER: Origami-Inspired Reconfigurable Surfaces that Enable Controllable Radiative Properties

现代电信、天文发现和国家安全都依赖于天基物体（如卫星、探测器、航天器、望远镜等）。在极端的热辐射条件下工作。 这个CAREER项目的目标是提供一种通过改变表面形状来控制空间物体表面辐射热量的方法。热能辐射影响表面温度。太阳的运动（如轨道或每日太阳活动周期）导致了各种各样的辐射条件。这项工作将为表面或组件提供一种方法，以响应太阳位置的变化，并实现所需的加热或冷却速率。该项目科学目标的教育伙伴是为本科研究人员的发展而实施的扩大科学和技术本科教育（BURST）方案。参与杨百翰大学航天器小组的本科生的教育发展活动将以参与BURST项目（本科生研究）为高潮，以帮助学生追求研究生教育，并提供探索研究项目的机制。与航天器组的学生一起开展的活动包括通过帮助大学准备来接触代表性不足的少数民族高中生，与低收入学校开展K-12 STEM活动，以及创建一个网站以获取数据和教学工具。这个CAREER项目的目标是使用折纸启发的表面提供辐射表面特性的动态控制。折纸的致动可以使得能够控制表面形貌和对应的腔几何形状，以响应于辐射环境的变化来调节净辐射热传递。固有的辐射表面特性是静态的，因此不能适应不断变化的热环境。通过控制辐射特性来动态地控制净辐射热通量将使得能够对其中辐射是与环境进行热交换的主要模式的表面进行热管理。由镶嵌（由一个或多个几何形状组成的平铺平面）组成的折纸启发的表面能够提供可适应的表面形貌以修改表观辐射表面行为。当包括未折叠表面的棋盘格在折叠期间彼此塌陷时，由于腔的高纵横比而形成深凹槽，其捕获辐射能量。通过机械致动控制腔角度导致对类黑行为程度的控制。为了实现通过可控的辐射特性提供热管理的目标，在折纸启发的表面的研究中的以下目标（例如改进的V形槽、Miura-ori和Baretto Mars）将追求：1）量化和模拟热辐射的排放; 2）量化和模拟热辐射的吸收; 3）预测和验证这些表面处的净传热率;以及4）通过培训活动建立本科生的研究准备，最终在研究经验。这项工作开发的工具和分析方法将使设计通过简单的驱动方法的辐射热管理，并提供预测关系的辐射行为的角topographies.This奖项反映了NSF的法定使命，并已被认为是值得通过评估使用基金会的智力价值和更广泛的影响审查标准的支持。

Modern telecommunications, astronomical discovery, and national security rely on space-based objects (e.g. satellites, probes, spacecraft, telescopes, etc.) that operate in extreme thermal radiation conditions. The goal of this CAREER project is to provide a way to control the amount of heat the surface of a space object radiates by changing the surface shape. Radiation of thermal energy affects surface temperature. Sun motion (e.g. orbit or daily solar cycles) results in a wide range of radiation conditions. This work will provide a way for a surface or component to respond to changes in the sun location and achieve a desired heating or cooling rate. An educational companion to the scientific objectives of this project is the creation of the Broadening Undergraduate Education in Science and Technology (BURST) Program to be implemented for the development of undergraduate researchers. Educational development activities for undergraduate classmen participating in the Spacecraft Group at BYU will culminate in the participation of BURST projects (undergraduate research) to assist students in the pursuit of a graduate education and provide a mechanism to explore the research project. Activities performed with students in the Spacecraft Group include outreach to underrepresented minority high school students by assisting with college preparation, K-12 STEM activities with low-income schools, and the creation of a website for access to data and instructional tools.The goal of this CAREER project is to provide dynamic control of radiative surface properties using origami-inspired surfaces. Actuation of origami can enable control of surface topography and corresponding cavity geometries to regulate net radiative heat transfer in response to changes in the radiative environment. Intrinsic radiative surface properties are static and therefore unable to adapt to changing thermal environments. Dynamically controlling the net radiative heat flux by controlling radiative properties would enable thermal management of surfaces where radiation is a dominant mode of heat exchange with the environment. Origami-inspired surfaces, comprised of tessellations (a tiled plane comprised of one or more geometric shapes), are able to provide an adaptable surface topography to modify the apparent radiative surface behavior. As the tessellations that comprise the unfolded surface collapse on each other during folding, deep grooves are formed which trap radiative energy due to the high-aspect ratio of the cavity. Controlling the cavity angle through mechanical actuation results in control of the degree of black-like behavior. To achieve the goal of providing thermal management through controllable radiative properties, the following objectives in the study of origami-inspired surfaces (e.g. Modified V-groove, Miura-ori, and Baretto Mars) will be pursued: 1) quantify and model emission of thermal radiation; 2) quantify and model absorption of thermal radiation; 3) predict and validate the net heat transfer rate at these surfaces; and 4) establish undergraduate research preparation through training activities that culminate in a research experience. Tools and analysis methods developed by this work will enable design for radiative thermal management through simple actuation methods and provide predictive relations for radiative behavior of angular topographies.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.