从点云对薄壁结构的外模型重建,用于现有钢桥的有限元模型建模
Tomoya Nakamizo1, Mayuko Nishio2
1Department of Engineering Mechanics and Energy, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 3058573, Japan.
Sensors (Basel, Switzerland)
|July 12, 2025
概括
本研究介绍了一种方法,可以从点云数据中创建外元素有限元素 (FE) 模型,用于像桥梁这样的薄壁结构. 该方法确保了准确的结构分析和维护评估.
科学领域:
- 土木工程 土木工程是指土木工程.
- 计算力学 计算力学 计算力学
- 地理空间数据分析.
背景情况:
- 使用点云数据的数字双胞胎模型对于桥梁维护和性能评估至关重要.
- 现有的方法往往侧重于固体元素,限制其应用到复杂的结构,如需要梁和外元素的桥梁等.
- 需要系统的方法来从薄壁建筑的点云数据中生成外元素有限元素 (FE) 模型.
研究的目的:
- 提出一个系统的方法来构建外元素FE模型从薄壁结构成员的点云数据.
- 通过实验和比较分析来验证生成的FE模型的准确性.
- 评估点云数据质量对FE模型几何和分析结果的影响.
主要方法:
- 使用k-means集群的点云细分.
- 通过主要组件分析估计中性平面.
- 使用边缘检测基于正常向量变化的几何结构确定.
主要成果:
- 验证实验显示,一个钢角样本的尺寸误差高达5毫米,角度误差高达6度.
- 静态负载分析的准确性很好,最大位移误差在3.8%内,最大应力误差在7.7%内.
- 点云数据质量显著影响FE模型的准确性,密度变化降低中性平面估计精度.
结论:
- 拟议的方法提供了一个系统的方法,用于从点云数据生成外元素FE模型.
- 该研究建立了由点云数据衍生的FE模型的验证框架,确保结构分析的适当抽象.
- 调查结果强调了数据质量评估对于桥梁工程中可靠的数字双胞胎应用的重要性.
相关概念视频
Unsymmetric Loading of Thin-Walled Members: Problem Solving
171
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
171
Unsymmetric Loading of Thin-Walled Members
150
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
The concept of the shear center is crucial in countering the...
150
Thin-Walled Hollow Shafts
247
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
247
Design of Prismatic Beams for Bending
376
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
376
Typical Model Studies
443
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
443
Internal Loadings in Structural Members: Problem Solving
1.4K
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
1.4K


