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Dissertations / Theses on the topic 'Nonlinear vibration Absorber'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Hsu, Yungsheng. "The performance of a nonlinear dynamic vibration absorber." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/364273/.

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This project investigated the physical behaviour and the effectiveness of a nonlinear dynamic vibration absorber (NDVA), which was designed to possess hardening stiffness characteristics. Two types of external force excitation were considered (harmonic and random input) applied to a primary system, with attached NDVA, and the response compared. For harmonic excitation, the governing equations of motion for the entire vibrating system and the expressions for the solution were derived using the Harmonic Balance Method (HBM). Mathematical expressions for the frequency response curves of the struc

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2

Lavazec, Déborah. "Experimental evaluation and modeling of a nonlinear absorber for vibration attenuation : design, identification, and analysis." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1217/document.

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En raison de leurs grandes longueurs d'onde, les vibrations mécaniques en basses fréquences ne peuvent être facilement réduites dans les structures par l'utilisation de matériaux dissipatifs. Malgré ces difficultés, l'atténuation des vibrations en basses fréquences reste un enjeu important. Pour résoudre ce problème, différents axes de recherche ont été étudiés et ont été mis en application pour stocker et dissiper l'énergie vibratoire comme l'utilisation d'oscillateurs linéaires, composés d'une masse, d'un ressort et d'un amortisseur. Leur fréquence de résonance doit coïncider avec la fréquen

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3

Ashour, Osama Naim. "Nonlinear Control of Plate Vibrations." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26266.

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A nonlinear active vibration absorber to control the vibrations of plates is investigated. The absorber is based on the saturation phenomenon associated with dynamical systems with quadratic nonlinearities and a two-to-one internal resonance. The technique is implemented by coupling a second-order controller with the plate's response through a sensor and an actuator. Energy is exchanged between the primary structure and the controller and, near resonance, the plate's response saturates to a small value. Numerical as well as experimental results are presented for a cantilever rectangular pl

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4

Djemal, Fathi. "Analyse et optimisation des batteurs dynamiques non linéaires." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2015. http://www.theses.fr/2015ECAP0007/document.

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Les vibrations qui sont en général source de dérangement, d’usure et même destruction des machines et structures mécaniques doivent être contrôlées ou éliminées. Pour cette raison, la lutte contre les vibrations est devenue depuis des années un enjeu majeur pour les chercheurs de laboratoire et de développement dans l’industrie afin de développer des solutions efficaces contre ces problèmes. De nombreuses technologies ont donc été développées. Parmi ces technologies, les absorbeurs de vibration non linéaires présentent des performances importantes dans l’atténuation de vibration sur une large

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5

石田, 幸男, Yukio ISHIDA, 剛志井上 та Tsuyoshi INOUE. "動吸振器を用いた非線形回転軸系の制振". 日本機械学会, 2002. http://hdl.handle.net/2237/9050.

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6

Yan, Zhimiao. "Modeling of Nonlinear Unsteady Aerodynamics, Dynamics and Fluid Structure Interactions." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/71824.

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We model different nonlinear systems, analyze their nonlinear aspects and discuss their applications. First, we present a semi-analytical, geometrically-exact, unsteady potential flow model is developed for airfoils undergoing large amplitude maneuvers. Towards this objective, the classical unsteady theory of Theodorsen is revisited by relaxing some of the major assumptions such as (1) flat wake, (2) small angle of attack, (3) small disturbances to the mean flow components, and (4) time-invariant free-stream. The kinematics of the wake vortices is simulated numerically while the wake and

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7

Pratt, Jon Robert Jr. "Vibration Control for Chatter Suppression with Application to Boring Bars." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29344.

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A mechatronic system of actuators, sensors, and analog circuits is demonstrated to control the self-excited oscillations known as chatter that occur when single-point turning a rigid workpiece with a flexible tool. The nature of this manufacturing process, its complex geometry, harsh operating environment, and poorly understood physics, present considerable challenges to the control system designer. The actuators and sensors must be rugged and of exceptionally high bandwidth and the control must be robust in the presence of unmodeled dynamics. In this regard, the qualitative characterization

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8

Oueini, Shafic Sami. "Techniques for Controlling Structural Vibrations." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/27176.

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We tackle the problem of suppressing high-amplitude vibrations of cantilever beams when subjected to either primary external or principal parametric resonances. Guided by results of previous investigations into the nonlinear dynamics of single- and multi-degree-of-freedom structures, we design mechatronic systems of sensors, actuators, and electronic devices and implement nonlinear active feedback control. In the case of external excitation, we devise two vibration absorbers based on either quadratic or cubic feedback. We conduct theoretical analyses and demonstrate that when a two-to-on

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9

Godoy, Willians Roberto Alves de. "Projeto, análise e otimização de um absorvedor dinâmico de vibrações não linear." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-06112017-140840/.

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Absorvedores de vibração são comumente usados em aplicações com intuito de reduzir indesejadas amplitudes de vibração de estruturas e maquinas vibrantes. O conceito de um absorvedor de vibração linear consiste na ideia de projetar um subsistema com frequência de ressonância coincidente com uma dada frequência de interesse, tal que a amplitude de vibração do sistema primário e significativamente reduzida quando comparada a situação original, sem o absorvedor de vibração. Porem, uma deficiência dos absorvedores de vibração lineares típicos e sua estreita faixa de frequência de operação. Para sup

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10

Schottmüller, Martin [Verfasser], and A. [Akademischer Betreuer] Albers. "Ein Ansatz zur dynamischen Charakterisierung und Bewertung von nichtlinearen Schwingungssystemen anhand des Beispiels Fliehkraftpendel = An approach for dynamic characterization and evaluation of nonlinear vibration systems using the example of a centrifugal pendulum absorber / Martin Schottmüller ; Betreuer: A. Albers." Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1240314515/34.

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11

Agnes, Gregory Stephen. "Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30740.

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Linear vibration absorbers are a valuable tool used to suppress vibrations due to harmonic excitation in structural systems. Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this work to vibration absorbers in their three major physical implementations: the mechanical vibration absorber, the inductive-resistive shunted piezoelectric vibration absorber, and the electronic vibration absorber (also denoted a positive position feedback controller). A single, consistent, physically

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12

Iurasov, Volodymyr. "Contrôle passif en vibroacoustique avec absorbeur dynamique bistable." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0034.

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Le travail présenté dans cette thèse est dédié à l’étude d’un absorbeur bistable continu basé sur le principe du "Nonlinear Energy Sink" (NES) et son utilisation pour l’atténuation des vibrations d’un système mécanique à plusieurs degrés de liberté sous excitation acoustique. Le modèle analytique du comportement linéaire de l’absorbeur ainsi que le modèle numérique complet ont été présentés, analysés et validés par des séries d’expériences. Le complexité du transfert énergétique ciblé ("Targeted Energy Transfer" ou TET) entre l'absorbeur et le système primaire à contrôler n’a pas permis une de

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13

Grenat, Clément. "Nonlinear Normal Modes and multi-parametric continuation of bifurcations : Application to vibration absorbers and architectured MEMS sensors for mass detection." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI078/document.

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Un des buts de cette thèse est d’approfondir la compréhension de la dynamique non-linéaire, notamment celle des MEMS, en proposant de nouvelles méthodes d’analyse paramétrique et de calcul de modes normaux non-linéaires. Dans une première partie, les méthodes de détection, de localisation et de suivi de points de bifurcation selon un unique paramètre sont rappelées. Ensuite, une nouvelle méthode d’analyse multiparamétrique basée sur la continuation récursive d’extremums est présentée. Cette méthode est ensuite appliquée à un absorbeur de vibration non-linéaire afin de repousser l’apparition de

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14

Snoun, Cherif. "Contrôle passif des vibrations des systèmes mécaniques à l’aide d’absorbeurs dynamiques non linéaires avec prise en compte des incertitudes." Thesis, Tours, 2020. http://www.theses.fr/2020TOUR4001.

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Face à l’augmentation des exigences à la fois économiques et de santé publique, les industriels sont dans la nécessité de concevoir des systèmes mécaniques de plus en plus performants et respectant un certain niveau de confort acoustique. En mécanique ou en acoustique, le contrôle de vibrations est un champ de recherche très actif. Trois grands types de technologie sont majoritairement utilisées dans l’industrie : le contrôle passif par dissipation, le contrôle passif à l’aide d’absorbeurs linéaires accordées et le contrôle actif, chacune de ses techniques possédant ses avantages et ses inconv

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15

Pafume, Coelho João Flavio. "Contrôle Passif Nonlinéaire du Phénomène de Résonance Sol des Hélicoptères." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0012/document.

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Le phénomène de résonance sol (PRS) est une instabilité pouvant survenir lorsque l’hélicoptère est au sol et le rotor est en marche ; elle peut vite aboutir à la destruction de l’appareil. L’origine de l’instabilité est un couplage entre les mouvements de roulis du fuselage posée sur le train d’atterrissage et le mouvement asymétrique de l’ensemble des pales dans le plan du rotor principal. Etudier théoriquement des alternatives de stabilisation par des absorbeurs de vibration linéaires (tuned mass dampers - TMD) et non linéaires (nonlinear energy sinks - NES) c’est le sujet de ce travail de t

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16

Lu, Hsueh-Chi, and 呂學奇. "Vibration Mitigation of a dynamic vibration absorber on a nonlinear simple beam." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/99179458478616969909.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>102<br>Beam vibration has always been a concern for researchers and engineers and vibration within nonlinear systems is particularly problematic. This study considered a slender hinged-hinged nonlinear elastic beam with suspension cables simulated using nonlinear cubic springs and linear dampers to allow greater amplitude in the transverse direction. The model in this study could be applied to the engineering of structures with nonlinear suspension systems. In addition, inverting the system, we could simulate the beam placing on a Winkler-type elastic foundation. T

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17

Chen, Hsin-Hung, and 陳信宏. "The Study of a Frequency-adjustable Nonlinear Micro-vibration Absorber." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/94037570102740049611.

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碩士<br>國立臺北科技大學<br>製造科技研究所<br>91<br>With the advancing technology, manufacture-production and measure-technique are getting more and more important, particularly nano and Micro-Electro Mechanical Systems (MEMS). External vibrations are very sensitive to nano instruments such as Atomic Force Microscopy (AFM). The mechanical Perturbation is especially harmful to AFM and distorts the quality of AFM images. The main purpose of the present study is to design an appropriate, practical and novel vibration suppressing system for precision instruments. The work is accomplished by adopting a nonlinear el

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18

Kuo, Ting-Hung, and 郭庭宏. "Effects of a Dynamic Vibration Absorber On Nonlinear Hinged-free Beam." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/73974459826840102931.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>102<br>This study considered a slender hinged-free nonlinear beam embedded in a Winkler type elastic foundation simulated using nonlinear cubic springs. This also created multiple possibilities for mode coupling and internal resonance. The objective of this study was to avoid internal resonance within this system and achieve effective vibration damping. We added a time-dependent boundary dynamic vibration absorber (TDB DVA) that was suspended at the free end of the beam to reduce vibration and prevent internal resonance. The Mindlin-Goodman method was used to analy

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19

Wu, Li-Ping, and 吳莉平. "Effect of Dynamic Vibration Absorber on Fixed-Fixed 3D Nonlinear String Embedded in Elastic Foundation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/65531683626929031315.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>103<br>This study examined the vibrations of a fixed-fixed nonlinear 3D string placed on a nonlinear elastic foundation. We found that specific combinations of elastic modulus in the elastic foundation resulted in 1:3 internal resonances in the 1st and 4nd modes of the string. This prompted us to add a tuned mass damper (TMD) on the string in order to prevent internal resonance and suppress vibrations. In general, the idea of TMD can be applied on the vibration reduction of any string-like structures resting on elastic foundations, for example, the device of TMD ca

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20

Tu, Shu-Chien, and 塗舒茜. "Effect of Dynamic Vibration Absorber on Fixed-free 3D Nonlinear Beam Embedded in Elastic Foundation." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/00046122032054958533.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>103<br>Vibration has long played a crucial role in engineering due to its effects on structural stability, metal fatigue, and structural damage to materials. Beams are used in a wide range of engineering problems and the internal resonance of nonlinear beam vibrations is a popular research topic. Internal resonance is unique to nonlinear systems in which integer relationships exist among the natural frequencies with various modes. This study examined the vibrations of a 3D fixed-free nonlinear beam placed on a nonlinear elastic foundation. We found that specific co

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21

Chang, Chia-Man, and 張家嫚. "The Study of A Nonlinear Suspension Elastic Beam with An End Point Dynamic Vibration Absorber." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/71955259940263791315.

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碩士<br>淡江大學<br>航空太空工程學系碩士班<br>101<br>This study investigated the performance of a mass-spring dynamic vibration absorber (DVA) at the free end of a hinged-free elastic beam under simple harmonic excitation. This beam system was suspended by suspension cables. These cables were simulated by cubic nonlinear springs to examine the nonlinear characteristics of this system. The combination of mass and spring constant of the tip-attached dynamic vibration absorber (DVA) were investigated. This time-dependent non-homogeneous boundary condition problem was solved by Mindlin-Goodman method. By using the

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22

Eason, Richard. "High amplitude response behavior of a linear oscillator-nonlinear absorber system: Identification, analysis, and attenuation by using a semi-active absorber in series." Thesis, 2013. http://hdl.handle.net/1911/71949.

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Auxiliary absorbers provide an effective means to attenuate the vibrations of a structural or mechanical system (the "primary structure"). The simplest auxiliary absorber, a tuned mass damper (TMD), provides reliable narrow-band attenuation but is not robust to the effects of detuning. Strongly nonlinear tuned mass dampers (NTMDs) are capable of wide-band, irreversible energy transfer known as "energy pumping" but can also exhibit high amplitude solutions which significantly amplify the response of the primary structure. Semi-active tuned mass dampers (STMDs) incorporate an actuating elemen

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