Development and Analysis of Methods for the Identification of Correlated Parameters in Multifield Problems

多场问题中相关参数识别方法的开发和分析

基本信息

批准号：
264166740
负责人：
Professor Dr.-Ing. Carsten Könke
金额：
--
依托单位：
Institut für Strukturmechanik (ISM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2014
资助国家：
德国
起止时间：
2013-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/264166740?language=en
关键词：
Development Analysis Methods Identification Correlated

项目摘要

The evaluation of the safety of buildings, which suffer from hydrological, temperature and mechanical loads, e.g., dams, is a highly demanding problem due to the interaction effects of the different fields.The estimation of the lifetime of such building is often linked to the question of the current state of damage.For existing structures the question arises, how existent cracks or damages can be identified with a high precision in a model-based approach. A possible scenario might be, that for a newly constructed building a validated and calibrated model has been derived. After some years of usage, and in particular after extreme events like earthquakes, cracks or damages might have occurred inside the structures.Those shall be identified by measurements of a relatively short time interval (e.g. one month) and the comparison with the existing model. The goal of the proposed project is the develop and analyze methods, which can consider during identification procedures possible correlations of main parameters (e.g. those to model damage) in a multi-field system. For example, in case of a damage in a dam one can expect in parallel a local increase of the hydraulic permeability and a local reduction of the mechanical stiffness.Such correlations can be considered explicitly during an inverse analysis, in order to improve the confidence in the detected quantities. For the proposed problem, the damage identification, cracks and damages will be described with the eXtended Finite Element Methode (XFEM). XFEM has established as a useful tool, in particular for inverse problems, as during the identification routines no re-meshing of the domain is necessary.The method to develop is of general character and might be applied to several multi-field identification problems in engineering and natural sciences, where correlations between the input parameters are known or can at least be estimated, e.g. piezoelectricity, magneto-electronics or thermo-mechanics. The proposed research project includes the development and analysis of mathematical models for the identification of parameters in a multi-field context and the validation of the derived methods with existing measurements of real buildings.

由于不同场的相互作用，对承受水文、温度和机械载荷的建筑物（例如水坝）的安全性评估是一个要求很高的问题。此类建筑物的寿命估计通常与当前损坏状态的问题。对于现有结构，出现的问题是如何通过基于模型的方法高精度识别现有的裂缝或损坏。一种可能的情况是，对于新建的建筑，已经导出了经过验证和校准的模型。经过几年的使用，特别是在地震等极端事件之后，结构内部可能会出现裂缝或损坏。这些应通过相对较短的时间间隔（例如一个月）的测量并与现有模型进行比较来识别。所提议项目的目标是开发和分析方法，该方法可以在识别过程中考虑多场系统中主要参数（例如用于建模损坏的参数）的可能相关性。例如，在大坝损坏的情况下，可以预期水力渗透性的局部增加和机械刚度的局部降低同时发生。在逆分析过程中可以明确考虑这种相关性，以提高预测的置信度。检测到的数量。对于所提出的问题，将使用扩展有限元法（XFEM）来描述损伤识别、裂纹和损伤。 XFEM 已成为一种有用的工具，特别是对于反问题，因为在识别例程期间无需重新划分域网格。所开发的方法具有通用性，可应用于工程中的多个多领域识别问题和自然科学，其中输入参数之间的相关性是已知的或至少可以估计，例如压电、磁电子学或热力学。拟议的研究项目包括开发和分析用于在多领域环境中识别参数的数学模型，以及使用真实建筑物的现有测量来验证派生方法。