相关实验视频
Updated: May 8, 2026
14:57
Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
Published on: January 30, 2019
灵活的太阳能阵列的非线性稳定性和振动在半阴影阶段在热诱导的动下
Omid Motaharifard1, Kamran Daneshjou1, Majid Bakhtiari2
1Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, Tehran, 16844, Iran.
Scientific reports
|February 19, 2026
概括
这项研究模拟了带有灵活太阳能阵列的航天器,以了解热和自我激发的振荡. 它揭示了在轨道热变化期间,极限周期振荡和内部共振如何影响航天器动态.
科学领域:
- 太空飞船动力学和控制
- 结构动力学 结构动力学
- 航空航天工程 航空航天工程
背景情况:
- 具有灵活太阳能阵列的航天器由于热梯度而经历复杂的振动.
- 轨道机动期间的短暂的热条件,如半阴影阶段,可以诱导自我激发的振荡.
- 非线性现象,如极限周期振荡 (LCOs) 和内部共振对于航天器的稳定性至关重要.
研究的目的:
- 为具有灵活太阳能阵列的航天器开发非线性分析模型.
- 调查热模式下的振动现象,重点关注半阴影阶段.
- 分析灵活空间结构中的极限周期振荡 (LCOs) 和内部共振.
主要方法:
- 开发一种非线性分析模型,捕捉合的曲-曲-扭曲运动.
- 纳入短暂的热梯度和结构灵活性效应.
- 应用非线性动态建模,时间域模拟和模型缩小来导出非线性普通微分方程.
- 使用多个尺度 (MMS) 方法分析识别内部共振条件.
- 采用相位图,庞卡雷截面和分叉图来进行动态行为评估.
主要成果:
- 该模型成功捕捉了复杂的振动现象,包括LCO和内部共振.
- 通过分析识别了内部共振条件,澄清了模态能量交换.
- 分叉分析阐明了在不同的热条件下LCOs的出现和演变.
- 这项研究提供了对像哈勃太空望远镜这样的灵活空间结构特有的热力学不稳定性的见解.
结论:
- 开发的非线性模型为灵活的航天器的合热力学不稳定性提供了关键的见解.
- 了解LCO和内部共振对于设计强大的航天器系统至关重要.
- 这些发现有助于改进用于动态热环境的航天器设计,并提高任务可靠性.
相关概念视频
01:20Bending and Torsional Moments
Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
01:13Stability of Equilibrium Configuration: Problem Solving
The stability of equilibrium configurations is an important concept in physics, engineering, and other related fields. In simple terms, it refers to the tendency of an object or system to return to its equilibrium position after being disturbed. The stability of an equilibrium configuration can be analyzed by considering the potential energy function of the system and examining its behavior near the equilibrium point.
Problem-solving in the context of the stability of equilibrium configuration...
Problem-solving in the context of the stability of equilibrium configuration...
01:16Flexural Stress
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
01:14Stability of structures
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
01:24Pole and System Stability
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's response.
01:28Stability
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...