Modal Testing: A Practitioner's Guide

Avitabile, Peter

doi:10.1002/9781119222989

Cited by 87 publications

(112 citation statements)

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“…The modal reconstruction is realized with help of PolyMax module [13] of the LMS software developed by Siemens. By analyzing the relative position and motion of the accelerometers installed on tank wall, we are able to reconstruct the experimental modal analysis [14].…”

Section: Experimental Methods and Data Acquisitionmentioning

confidence: 99%

Experimental testing of pre-stressed granular assemblies as a surrogate material for the dynamic analysis of launcher cryogenic tanks

Nguyen

Chiambaretto

Charlotte

et al. 2019

Engineering Structures

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A B S T R A C TThis paper focuses on the experimental validation of a new methodology for substitution of Liquid Hydrogen (LH2) on a simplified model of launcher cryogenic tank in vibration analysis by using pre-stressed grains as surrogate materials. The objective of the experiments presented here is to analyze the modal behavior of the (Tank and Granular materials) system during pre-stress procedure. In these experimental tests, a cylindrical tank is fully filled with granular materials and vibrated under swept sine and random excitations. Then, the natural frequency of each vibration mode is measured at different levels of pre-stress. The results obtained from the tests show the evolution of each flexural mode as a function of applied pre-stress. Nonlinear behavior of the analyzed system during vibration was also observed. These experimental values carried out with Tank-Granular material system (TGM) are compared with numerical and analytical results to prove the potential of the new methodology. Finally, based on obtained experimental results, some solutions are proposed in order to improve the new methodology for vibration analysis of cryogenic tank which is an important thematic in aerospace engineering.

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Section: Experimental Methods and Data Acquisitionmentioning

confidence: 99%

Experimental testing of pre-stressed granular assemblies as a surrogate material for the dynamic analysis of launcher cryogenic tanks

Nguyen

Chiambaretto

Charlotte

et al. 2019

Engineering Structures

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“…When using the impulse excitation method to extract the modal parameters of the object to be measured, the entire system needs to meet four major assumptions [36]:…”

Section: Experimental Modal Analysis Theorymentioning

confidence: 99%

“…where s is the Laplace variable, and the system transfer function can be obtained in fraction form, as follows [36]:…”

Section: + [C]mentioning

confidence: 99%

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Experimental and Simulation Modal Analysis of a Prismatic Battery Module

Xia

Liu

et al. 2020

Energies

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The battery pack is the core component of a new energy vehicle (NEV), and reducing the impact of vibration induced resonance from the ground is a prerequisite for the safety of an NEV. For a high-performance battery pack design, a clear understanding of the structural dynamics of the key part of battery pack, such as the battery module, is of great significance. Additionally, a proper computational model for simulations of battery module also plays a key role in correctly predicting the dynamic response of battery packs. In this paper, an experimental modal analysis (EMA) was performed on a typical commercial battery module, composed of twelve 37Ah lithium nickel manganese cobalt oxide (NMC) prismatic cells, to obtain modal parameters such as mode shapes and natural frequencies. Additionally, three modeling methods for a prismatic battery module were established for the simulation modal analysis. The method of simplifying the prismatic cell to homogenous isotropic material had a better performance than the detailed modeling method, in predicting the modal parameters. Simultaneously, a novel method that can quickly obtain the equivalent parameters of the cell was proposed. The experimental results indicated that the fundamental frequency of battery module was higher than the excitation frequency range (0–150 Hz) from the ground. The mode shapes of the simulation results were in good agreement with the experimental results, and the average error of the natural frequency was below 10%, which verified the validity of the numerical model.

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“…Primer y segundo modo de una viga empotrada a partir de las FRF obtenidas en tres puntos. (Avitabile, 2018) Las formas modales se relacionan con los residuos mediante los vectores modales, de forma que el residuo para un modo particular es proporcional al producto del desplazamiento modal en el punto de respuesta i y del desplazamiento modal en el punto de excitación j.…”

Section: Introducción Al Emaunclassified

Control de vibraciones en estructuras flexibles mediante amortiguadores de masa pasivos, adaptativos, semiactivos y activos

Sánchez¹,

Mariano²

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A María, Lucas y MatíasGracias por vuestro amor, alegría y apoyo.ii iii Agradecimientos La consecución de esta tesis ha sido el final de un camino de idas y venidas que inicié cuando empecé a trabajar en CARTIF. A lo largo de estos años, he compartido estudios, pruebas de campo, discusiones y también momentos de ocio con compañeros de trabajo y colegas de la Universidad de Valladolid en un tema que en muchos momentos nos ha apasionado. Mediante estas líneas, quiero expresar mi más sincero agradecimiento a todas las personas que me brindaron su apoyo y ayuda durante estos años.A mis directores de tesis, el Dr. Antolín Lorenzana y el Dr. Iván M. Díaz. Sin vuestro apoyo, conocimientos y empuje, habría sido muy difícil haber llegado hasta aquí A mis compañeros y excompañeros de CARTIF. En especial a Jesús de Sebastián, mi brazo derecho en la mayoría de las pruebas de campo. Gracias por tu paciencia en los problemas del día a día.A CARTIF y a su Director D. José Ramón Perán González, que nunca dejó de confiar en que llevaría adelante la tesis. Gracias por los medios y el tiempo que puso a mi disposición para su realización.A Alfonso V. Poncela. Gracias por darme la oportunidad de conocer este apasionante tema. Y por último, y no menos importante, a mi familia, mis padres y hermanos. Gracias por haberme dado tanto.iv v Preámbulo De acuerdo con la normativa vigente del procedimiento para la presentación y defensa de la tesis doctoral en la Universidad de Valladolid (RESOLUCIÓN de 8 de junio de 2016, del Rectorado de la Universidad de Valladolid, por la que se ordena la publicación del Acuerdo del Consejo de Gobierno de 3 de junio de 2016), esta Tesis Doctoral se presenta en la modalidad ordinaria. Además de la publicación que acredita la calidad de la tesis, también se incluyen otras publicaciones con índice de impacto, comunicaciones a congresos y una patente realizados en el marco de esta línea de investigación La publicación con factor de impacto para la acreditación de la calidad de la tesis es la siguiente: (Anexo 1)  Casado CM, Díaz IM, de Sebastián J, Poncela AV, Lorenzana A.

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Modal Testing: A Practitioner's Guide

Cited by 87 publications

References 0 publications

Experimental testing of pre-stressed granular assemblies as a surrogate material for the dynamic analysis of launcher cryogenic tanks

Experimental testing of pre-stressed granular assemblies as a surrogate material for the dynamic analysis of launcher cryogenic tanks

Experimental and Simulation Modal Analysis of a Prismatic Battery Module

Control de vibraciones en estructuras flexibles mediante amortiguadores de masa pasivos, adaptativos, semiactivos y activos

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