BIM-coupled vibroacoustic simulations

本研究项目的目标是利用有限元方法评估木结构的建筑声学。该程序应顺利嵌入计算机化规划过程，并提供准确的答案。尺寸缩小的板壳结构不适合用于此目的，因为它们不能以足够的精度模拟过渡区。因此，需要一种严格的体积导向方法，即有限元方法的p-版本。它允许精确和有效地表示薄壁和体积结构。这些计算的几何和物理基础是三维建筑信息模型。从这些信息中，推导出相关的拓扑和几何信息，然后为每个建筑组件分别生成一个体积网格。与整个建筑模型的所有一致性网格生成相比，组件明智的方法允许更大的灵活性，更接近真实的施工过程。但是，结点处的网格不一致，必须采用砂浆法进行适当的连接。在本项目的过程中，将进一步发展砂浆法，使声学弱缝的建模具有足够的精度。此外，在与项目伙伴的密切合作下，将研究p-FEM如何从能量流分析（efa）中获益，以关闭众所周知的“中频间隙”。最后，参数化建筑信息模型的使用将允许对建筑变体进行快速有效的研究，从而更快地产生针对建筑声学优化的变体。这些模型将通过实验进行详细验证。预计这种方法将在计算机化的规划过程中导致建筑声学评估的新质量。

The goal of the submitted research project is to evaluate building acoustics of timber structures by means of the finite element method. The procedure shall be embedded smoothly into the computerized planning process and provide accurate answers. Dimensionally reduced plate and shell structures are not appropriate for this purpose as they are not able to model transition zones with sufficient accuracy. Therefore, a strictly volume oriented approach by means of the p-version of the finite element method is aspired. It allows for an accurate and efficient representation of both, thin-walled and volumetric structures. The geometrical and physical basis for these computations are three-dimensional building information models. From these, the relevant topological and geometric information is derived and a volumetric mesh is then generated separately for each building component. By contrast to an all-conforming mesh generation of the entire model of the building, a component-wise approach allows for much more flexibility and is closer to the real construction process. However, the meshes will be non-conforming at the joints and have to be connected appropriately by means of the Mortar-method. In the course of this project, the mortar method will be further developed, such that acoustically weak joints can be modeled with sufficient accuracy. Furthermore, and in close cooperation with the project partners, it will be investigated how the p-FEM can profit from the energy flow analysis (efa) to close the well know ¿mid-frequency-gap¿. Finally, the usage of parameterized building information models will allow for a fast and efficient study of construction variants to yield variants optimized for building acoustics more rapidly. The models will be validated in detail by experiments. It is expected that this approach will lead to a new quality of the evaluation of building acoustics in a computerized planning process.