Ouput-only vibration analysis of buildings in operational conditions

运行条件下建筑物的仅输出振动分析

• 批准号: 491593-2015
• 负责人: Legrand, Mathias
• 金额: $ 1.82万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=586982
• 关键词: Ouput; only; vibration; analysis; buildings

Currently, owing to advances in sensing techniques and analysing procedures, the most popular experimental modal test for large structures is ambient vibration testing. Ambient vibration analysis leads to the essential structural characteristic of buildings called modal properties: mode shapes, natural frequencies and damping ratios. These information are essential to keep track of future changes in the integrity of a structure, serve as its baseline and help monitoring health of structures. Ambient vibration test is performed during normal operation of the structure, therefore there are different source of vibrations: wind, micro-tremors, human activities. Existence of these numbers of vibration sources requires very careful analysis of the recorded weak signals to be able to accurately derive modal properties. Current existing frequency and time domain methods have shortcomings with regard to analysis of noisy signals, closely space modes and damping ratios. They are complex to be used by engineers, and also their advantages and disadvantages are not clearly specified. The goal of the proposed project is to develop a new mix frequency / time domain method to improve the modal identification process. The goals of this project are summarized as follow: i) Detailed literature review of exiting methods to clearly identify their pros and cons. ii) To develop new algorithm that can deal with ambient signals with higher noise, allowing to use less sensitive low-cost sensors. iii) The developed algorithm should be able to handle the closely-spaced modes more efficiently. iv) To develop a simple method for on-site verification of time records so that the technician can re-conduct the test if a problem is detected. This technology transfer is essential for Sensequake Company and engineering community around the world.

目前，由于传感技术和分析程序的进步， 大型结构的模态试验是环境振动试验。环境振动分析导致的基本 建筑物的结构特性称为模态特性：振型、固有频率和阻尼 比率。这些信息对于跟踪结构完整性的未来变化至关重要， 基线和帮助监测结构的健康。在正常运行期间进行环境振动试验 因此，有不同的振动源：风，微震动，人类活动。 这些数量的振动源的存在需要非常仔细地分析所记录的弱信号， 能够准确地导出模态特性。当前现有的频域和时域方法具有 在分析噪声信号、紧密间隔模式和阻尼比方面存在缺点。他们是 工程师使用起来很复杂，而且它们的优点和缺点也没有明确说明。的 拟议项目的目标是开发一种新的混合频域/时域方法来改进模型 识别过程。该项目的目标概述如下： i）对现有方法进行详细的文献审查，以明确其利弊。 ii）开发新的算法，可以处理具有较高噪声的环境信号，允许使用更少的 低成本传感器。 iii）所开发的算法应该能够更有效地处理密集模式。 iv）制定一个简单的方法，在现场核实时间记录，以便技术人员能够重新进行 测试是否检测到问题。 这项技术转让对Sensequake公司和世界各地的工程界至关重要。