Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"operational modal analysis"”.
-
Operational modal analysis and model updating with a cyclostationary input
… thesis addresses the problem of identifying the modal properties of a system based only on measurements of the system responses. This situation is frequently encountered in structural dynamics and is particularly relevant for systems where the in-service excitation is not artificially …
-
Automatic operational modal analysis: challenges and applications to historic structures and infrastructures
… the work turns around the capability to automate Operational Modal Analysis methods for permanent dynamic monitoring systems. In general, the application of OMA methods requires an experienced engineer in experimental dynamics and modal analysis; in addition, a lot of time is usually spent in …
-
Operational Modal Analysis of Rolling Tire: A Tire Cavity Accelerometer Mediated Approach
… date, there is no direct procedure available for modal analysis of rolling tires with tread patterns under realistic operating conditions. The present start-of-art laser vibrometer based non-contact measurements are limited to tread vibration measurement of smooth tires only in a lab environment. …
-
Stress estimation for fatigue monitoring: determination through numerical models and operational modal analysis.
… concretamente utilizando superposición modal y la expansión de modos de vibración.
-
MATLAB implementation of an operational modal analysis technique for vibration-based structural health monitoring
… in vibration-based SHM require knowledge of the modal properties of the structure under evaluation in its current state. The technique of operational modal analysis allows for these modal properties to be obtained by using the structure's dynamic response to ambient excitation. Using MATLAB, a …
-
Full Field Reconstruction Enhanced With Operational Modal Analysis and Compressed Sensing for General Dynamic Loading
… structure. Among all the analytical methods, the modal expansion method is computationally efficient and thus more suitable for real time expansion of measured data. In this method, the full-field response is approximated by the linear combination of mode shapes. In previous studies, the modal …
-
Análise modal operacional de uma bomba centrífuga submersa utilizando a decomposição melhorada no domínio da frequência
The identification of modal parameters of electrical submersible pumps (ESP) is part of the process of increasing the reliability of this equipment, which is installed in places that are inaccessible, from a maintenance point of view, for oil exploitation, such as offshore oil wells and seabed, so …
-
A Comparison and Evaluation of Different Dynamic Characterization Approaches for Bridges
… a minimum. The three dynamic field test included Operational Modal Analysis, or ambient vibration testing, and controlled input vibration testing using an instrumented impact hammer and an electro-dynamic mass shaker. The two bridge specimens tested were a Parker pony truss structure and a …
-
Dynamic behaviour of curved cable-stayed bridges
… We discuss the different structure shapes and analysis the dynamic ability. These require in-depth analysis concerning unlikely predictable behavior often necessary FE model's simplification. Thus arose the necessity for structural engineers to develop solid experimental tools able to identify …
-
High-Resolution, High-Frequency Modal Analysis for Instrumented Buildings
… including highly variable environmental and operational conditions, complex construction and materials, and the sheer size of these structures. Often, the mitigation strategy is visual inspection and regular maintenance, which can be time-consuming and may not address root causes of failure. …
-
Accuracy Improvement in Robotic Milling Through Data-Driven Modelling and Control
… Process Regression (GPR) of data acquired from modal impact hammer experiments to predict the modal parameters of a 6-dof industrial robot as a function of its arm configuration is presented. The GPR model is found to be capable of predicting the robot’s dominant natural frequency of vibration, …
-
Towards a Better Understanding of the Fundamental Period of Metal Building Systems
Metal buildings account for over 40% of low-rise construction in the US. Despite this, predictive fundamental period equations that were obtained empirically for mid-rise construction are used in seismic design. Analytical modeling of metal building frames implied that these equations significantly …
-
Extraction of Structural Component Geometries in Point Clouds of Metal Buildings
Digital models are essential to quantifying the behavior of structural systems. In many cases, the creation of these models involves manual measurements taken in the field, followed by a manual creation of this model using these measurements. Both of these steps are time consuming and prohibitively …
-
Consideraciones respecto a los sistemas provisionales de protección de borde
… utilizando la técnica de Análisis Modal Operacional (OMA), obteniendo los modos de vibración y sus frecuencias asociadas. Mediante ultrasonidos se han obtenido las características mecánicas de las tablas en cada una de sus tres dimensiones principales. Con estos valores se han …