改进条形和链模型的质量凝聚和刚度参数,以获得准确的原木结构模态动力学
Anandaroop Lahiri1, Phanisri Pradeep Pratapa1
1Department of Civil Engineering, Indian Institute of Technology Madras , Chennai 600036, India.
概括
这项研究增强了原始元材料的条形和链模型,提高了模态分析的准确性. 新的参数预测自然频率的误差小于5%,明显优于现有方法.
科学领域:
- 材料机械学 材料机械学
- 计算力学 计算力学 计算力学
- 超材料科学科学 超材料科学
背景情况:
- 条和链框架为原木结构建模提供了一种有效的方法,特别适用于复杂的原木元材料.
- 传统的有限元素方法 (FEM) 由于其重复的几何形状和高自由度,对原始元材料来说在计算上昂贵.
- 之前的研究还没有广泛探索结构动态的条形和链模型,特别是小变形下的模态分析.
研究的目的:
- 在结构动态和原木结构的模态分析的背景下,提出和验证条和链模型的改进参数.
- 为了识别准确地捕获了条和链框架的低频变形模式 (折叠和面板曲).
- 通过使用精致的条形和链模型,提高对原木结构自然频率的预测准确度.
主要方法:
- 使用保存定律,推导条和链参数,包括一次性质量和旋转弹刚度.
- 通过对原木结构的有限元素 (FE) 测试进行验证.
- 识别适用于棒和链框架分析的低频模式.
主要成果:
- 改进的杆子和链模型准确地捕捉了低频原木折叠和面板曲模式.
- 精细的模型预测自然频率的最大误差为10%,通常小于5%.
- 与现有的条条和链方案相比,准确度的提高是三倍以上.
结论:
- 增强的条形和链模型提供了一个非常准确和高效的工具,用于对原木结构和元材料的模态分析.
- 拟议的参数改进大大促进了该框架在结构动态中的应用.
- 这项工作奠定了进一步调查原创灵感结构及其动态行为的基础.
相关概念视频
01:08Bending of Members Made of Several Materials
143
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
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01:20Bending and Torsional Moments
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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...
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01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
253
01:18Deformations in a Symmetric Member in Bending
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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
163
01:18Residual Stresses in Bending
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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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01:18Indeterminate Structure
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Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium. Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
507