高向前的推力 metasurface 梁骑帆帆.
Optics express
|February 1, 2024
概括
本研究分析了用于激光驱动太空推进的-二氧化 (Si-SiO2) 转化. 优化了稳定的光束骑行,设计平衡推力和稳定性,用于没有杆的激光帆.
科学领域:
- 光学是什么?光学是什么?光学是什么?
- 材料科学 材料科学 材料科学
- 航空航天工程 航空航天工程
背景情况:
- 激光驱动推进为太空探索提供了化学火箭的潜在替代方案.
- 超材料为操纵光提供了新的方法,使轻帆等新应用成为可能.
- 通过轻压推进的航天器的稳定控制对于任务的成功至关重要.
研究的目的:
- 在一个一维的Si-SiO2高对比度二进制元格上分析辐射压力力和扭矩.
- 为了优化用于稳定的光束骑行的metagrating,使用具有扩展高斯辐射分布的高功率激光.
- 为了研究前进推力和空间中激光驱动帆的稳定性之间的权衡.
主要方法:
- 使用一个由Si-SiO2高对比度二进制元格组成的单维双格.
- 同时优化二进制元级结构,以实现高前进推力和校正恢复力/扭矩.
- 使用有限差异时间域 (FDTD) 和有限元素 (FE) 数值方法来验证发现.
主要成果:
- 证明了稳定性可以以牺牲前进推力的代价来提高.
- 展示了无稳定杆的激光驱动帆设计,以减少质量和增强加速.
- 通过FDTD和FE数值方法之间的协议,证实了超材料发现的有效性.
结论:
- 优化的Si-SiO2转化显示出稳定,无弹的激光驱动太空推进的前景.
- 该研究强调了激光帆设计中推力和稳定性之间的关键平衡.
- 数字方法协议验证了拟议的超材料设计用于太空应用.
相关概念视频
Deflection of a Beam
264
Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
Singularity functions, described in an earlier lesson, are powerful mathematical tools that represent discontinuities within a function commonly encountered in structural loading...
264
Shear on the Horizontal Face of a Beam Element
175
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
175
Beams with Symmetric Loadings
190
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
The M/EI...
190
Impact Loading on a Cantilever Beam
393
The analysis of a cantilever beam with a circular cross-section subjected to impact loading at its free end illustrates the conversion of potential energy from a dropped object into kinetic energy, which is then absorbed by the beam as strain energy. This process is crucial for understanding how materials behave under dynamic loads, which is important in fields such as construction and aerospace.
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
When an object is dropped onto the free end of a cantilever, its potential energy due to gravity is...
393
Beams with Unsymmetric Loadings
121
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
121
Hydrostatic Pressure Force on a Plane Surface
334
When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
334


