Resonant Vibration
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Vibration control device for steel tubular towers of Horizontal Axis Wind Turbines
Abstract This paper presents and discusses the design of a vibration control device for a 120 m high steel tubular tower of onshore Horizontal Axis Wind Turbine (HAWT). The tower is modeled using beam (own code), and shell and solid finite elements (via ANSYS). The Dynamic Vibration Absorber (DVA) is designed to be attached to the tower top, aiming to analyz
Lat. Am. j. solids struct.. Publicado em: 10/07/2019
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2. Dynamic analysis of a concrete chimney considering the aerodynamic damping
Resumo Tradicionalmente, estruturas submetidas ao vento são avaliadas através de análises estáticas com carregamentos equivalentes, onde a influência da resposta flutuante é levada em conta por meio do fator de rajada. Essa metodologia é aplicável a estruturas suficientemente rígidas para não apresentarem resposta dinâmica ponderável [ ]. Estrutu
Rev. IBRACON Estrut. Mater.. Publicado em: 20/05/2019
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3. Passive vibration control using a metaconcrete thin plate
Abstract We investigated the band structure of flexural waves propagating in a metaconcrete thin plate, consisting of a concrete matrix reinforced by steel inclusions coated by rubber in square and triangular lattices. We considered the classical Kirchhoff-Love thin plate theory. We also studied the influence of inclusion geometry - circular, square and rota
Cerâmica. Publicado em: 2019-01
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4. Vibration Analysis of a Cylindrical Sandwich Panel with Flexible Core Using an Improved Higher-Order Theory
Abstract This paper deals with free vibration analysis of thick cylindrical composite sandwich panels with simply supported boundary conditions based on a new improved higher-order sandwich panel theory. The formulation used the third-order polynomial description for the displacement fields of thick composite face sheets and for the displacement fields in th
Lat. Am. j. solids struct.. Publicado em: 2017-03
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5. An Analytical Solution for Free Vibration of Elastically Restrained Timoshenko Beam on an Arbitrary Variable Winkler Foundation and Under Axial Load
Abstract Natural frequencies are important dynamic characteristics of a structure where they are required for the forced vibration analysis and solution of resonant response. Therefore, the exact solution to free vibration of elastically restrained Timoshenko beam on an arbitrary variable elastic foundation using Green Function is presented in this paper. An
Lat. Am. j. solids struct.. Publicado em: 2015
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6. Improved high order free vibration analysis of thick double curved sandwich panels with transversely flexible cores
This paper dealt with free vibration analysis of thick double curved composite sandwich panels with simply supported or fully clamped boundary conditions based on a new improved higher order sandwich panel theory. The formulation used the first order shear deformation theory for composite face sheets and polynomial description for the displacement field in t
Lat. Am. j. solids struct.. Publicado em: 2014
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7. Self-Tuning Multimodal Piezoelectric Shunt Damping
Piezoelectric shunt damping is a well known structural vibration control technique that consists in connecting an electrical circuit to a piezoelectric transducer attached to the structure. In the case of a resonant shunt, the network consisting of an inductor-resistor network when combined with the capacitive nature of the piezoelectric transducer impedance
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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8. Structural vibration control using extension and shear active-passive piezoelectric networks including sensitivity to electrical uncertainties
Active-Passive Piezoelectric Networks (APPN) integrate active voltage sources with passive resistance-inductance shunt circuits to a piezoelectric patch. This technique allows to simultaneously passively dissipate vibratory energy through the shunt circuit and actively control the structural vibrations. This work presents an analysis of active-passive dampin
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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9. Analysis of 1-3 piezocomposite and homogeneous piezoelectric rings for power ultrasonic transducers
Some power ultrasonic transducers, such as Tonpilz transducers, require high-power transmitting capability as well as broadband performance. Optimized vibrational modes can achieve these requirements. This work compares the resonant characteristics and the surface vibration modes between a homogeneous piezoelectric ring and a 1-3 piezocomposite ring, both us
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-12
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10. Novo sensor de vazão de fluidos com foco em aplicações biomedicas / New fluid flow sensor aimed at biomedical applications
Spirometer is a device that evaluates pulmonary ventilation. This paper presents a preliminary study of a new electromechanical sensor, focused on the biomedical application of spirometry. The sensor is composed of a bluff body positioned inside a tube trough a hole, being a part of the body inside and another part outside of the tube, and an accelerometer p
Publicado em: 2009
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11. Modeling and optimization of piezoelectric shunts apply to passive vibration control / Modelagem numérica e otimização de shunts piezelétricos aplicados ao controle passivo de vibrações
Due to the development of new technologies, industrial structures are now made of lighter materials and work at higher operation speeds producing an increasing vibration and noise level generation. As a result, different techniques of active and passive control have been developed and are continuously being improved. Among the passive control techniques, the
Publicado em: 2007
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12. Multimodal vibration damping through piezoelectric patches and optimal resonant shunt circuits
Piezoelectric elements connected to shunt circuits and bonded to a mechanical structure form a dissipation device that can be designed to add damping to the mechanical system. Due to the piezoelectric effect, part of the vibration energy is transformed into electrical energy that can be conveniently dissipated. Therefore, by using appropriate electrical circ
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-09