The Experts below are selected from a list of 57780 Experts worldwide ranked by ideXlab platform
Chunchuan Liu - One of the best experts on this subject based on the ideXlab platform.
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Band stop vibration suppression using a passive X-shape Structured lever-type isolation system
Mechanical Systems and Signal Processing, 2016Co-Authors: Chunchuan Liu, Xingjian Jing, Zhaobo ChenAbstract:In the paper, band-stop vibration suppression property using a novel X-shape Structured lever-type isolation system is studied. The geometrical nonlinear property of an X-shape Supporting Structure is used to improve the band-stop characteristics in the low frequency range of the lever-type vibration isolator. With the dynamics modeling of this hybrid structural system, it is shown that the proposed hybrid vibration system has very beneficial nonlinear stiffness and damping properties which are helpful to achieve much wider stop bandwidth. Theoretical results demonstrate that the anti-resonant frequencies, width and magnitude of the stop band can all be flexibly designed with structural parameters, and the parameters of the X-shape Supporting Structure are very critical for designing the band-stop frequency to achieve excellent low-frequency isolation performance. The results in the study provide a new approach to the design of the passive vibration suppression system in the low frequency region.
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Vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure
International Journal of Mechanical Sciences, 2015Co-Authors: Chunchuan Liu, Xingjian Jing, Fengming LiAbstract:This study presents some novel results about analysis and design of low-frequency or broadband-frequency vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure in passive or semi-active control manners. It is shown that the system has inherent nonlinear stiffness and damping properties due to Structure geometrical nonlinearity. Theoretical analysis reveals that the hybrid isolation system can achieve very good ultra-low-frequency isolation through a significantly-improved anti-resonance frequency band (by designing Structure parameters). Noticeably, the system can realize a uniformly-low broadband vibration transmissibility, which has never been reported before. Cases studies show that the system can work very well with good isolation performance subject to multi-tone and random excitations. The results provide a new innovative approach to passive or semi-active vibration control (e.g., via a simple linear stiffness control) for many engineering problems with better ultra-low/broadband-frequency vibration suppression.
E. P. Okabe - One of the best experts on this subject based on the ideXlab platform.
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An investigation on the influence of the Supporting Structure on the dynamics of the rotor system
Mechanical Systems and Signal Processing, 2005Co-Authors: Katia Lucchesi Cavalca, P. F. Cavalcante, E. P. OkabeAbstract:This work presents a methodology to analyse the influence of the foundation or Supporting Structure on the rotor-bearings system. The mathematical procedure applies a modal approach using modal parameters of generalised mass, damping ratio and natural frequencies. The Finite Elements Method is used to model the rotor. The linear model of the foundation is obtained by FEM and a modal approach is applied to reduce the degree of freedom order of the foundation model. The modal parameters of the foundation are estimated using the frequency response functions and their respective Fourier Transforms, obtained experimentally. An analysis of the frequency response of the complete system is accomplished considering physical co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. Convergence of the presented methodology is verified and the effect of the flexible foundation on the complete system response is analysed. © 2004 Elsevier Ltd. All rights reserved.
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an investigation on the influence of the Supporting Structure on the dynamics of the rotor system
Mechanical Systems and Signal Processing, 2005Co-Authors: Katia Lucchesi Cavalca, P. F. Cavalcante, E. P. OkabeAbstract:This work presents a methodology to analyse the influence of the foundation or Supporting Structure on the rotor-bearings system. The mathematical procedure applies a modal approach using modal parameters of generalised mass, damping ratio and natural frequencies. The Finite Elements Method is used to model the rotor. The linear model of the foundation is obtained by FEM and a modal approach is applied to reduce the degree of freedom order of the foundation model. The modal parameters of the foundation are estimated using the frequency response functions and their respective Fourier Transforms, obtained experimentally. An analysis of the frequency response of the complete system is accomplished considering physical co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. Convergence of the presented methodology is verified and the effect of the flexible foundation on the complete system response is analysed.
Fengming Li - One of the best experts on this subject based on the ideXlab platform.
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Vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure
International Journal of Mechanical Sciences, 2015Co-Authors: Chunchuan Liu, Xingjian Jing, Fengming LiAbstract:This study presents some novel results about analysis and design of low-frequency or broadband-frequency vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure in passive or semi-active control manners. It is shown that the system has inherent nonlinear stiffness and damping properties due to Structure geometrical nonlinearity. Theoretical analysis reveals that the hybrid isolation system can achieve very good ultra-low-frequency isolation through a significantly-improved anti-resonance frequency band (by designing Structure parameters). Noticeably, the system can realize a uniformly-low broadband vibration transmissibility, which has never been reported before. Cases studies show that the system can work very well with good isolation performance subject to multi-tone and random excitations. The results provide a new innovative approach to passive or semi-active vibration control (e.g., via a simple linear stiffness control) for many engineering problems with better ultra-low/broadband-frequency vibration suppression.
Xingjian Jing - One of the best experts on this subject based on the ideXlab platform.
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Band stop vibration suppression using a passive X-shape Structured lever-type isolation system
Mechanical Systems and Signal Processing, 2016Co-Authors: Chunchuan Liu, Xingjian Jing, Zhaobo ChenAbstract:In the paper, band-stop vibration suppression property using a novel X-shape Structured lever-type isolation system is studied. The geometrical nonlinear property of an X-shape Supporting Structure is used to improve the band-stop characteristics in the low frequency range of the lever-type vibration isolator. With the dynamics modeling of this hybrid structural system, it is shown that the proposed hybrid vibration system has very beneficial nonlinear stiffness and damping properties which are helpful to achieve much wider stop bandwidth. Theoretical results demonstrate that the anti-resonant frequencies, width and magnitude of the stop band can all be flexibly designed with structural parameters, and the parameters of the X-shape Supporting Structure are very critical for designing the band-stop frequency to achieve excellent low-frequency isolation performance. The results in the study provide a new approach to the design of the passive vibration suppression system in the low frequency region.
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Vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure
International Journal of Mechanical Sciences, 2015Co-Authors: Chunchuan Liu, Xingjian Jing, Fengming LiAbstract:This study presents some novel results about analysis and design of low-frequency or broadband-frequency vibration isolation using a hybrid lever-type isolation system with an X-shape Supporting Structure in passive or semi-active control manners. It is shown that the system has inherent nonlinear stiffness and damping properties due to Structure geometrical nonlinearity. Theoretical analysis reveals that the hybrid isolation system can achieve very good ultra-low-frequency isolation through a significantly-improved anti-resonance frequency band (by designing Structure parameters). Noticeably, the system can realize a uniformly-low broadband vibration transmissibility, which has never been reported before. Cases studies show that the system can work very well with good isolation performance subject to multi-tone and random excitations. The results provide a new innovative approach to passive or semi-active vibration control (e.g., via a simple linear stiffness control) for many engineering problems with better ultra-low/broadband-frequency vibration suppression.
Katia Lucchesi Cavalca - One of the best experts on this subject based on the ideXlab platform.
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an investigation on the influence of the Supporting Structure on the dynamics of the rotor system
Mechanical Systems and Signal Processing, 2005Co-Authors: Katia Lucchesi Cavalca, P. F. Cavalcante, E. P. OkabeAbstract:This work presents a methodology to analyse the influence of the foundation or Supporting Structure on the rotor-bearings system. The mathematical procedure applies a modal approach using modal parameters of generalised mass, damping ratio and natural frequencies. The Finite Elements Method is used to model the rotor. The linear model of the foundation is obtained by FEM and a modal approach is applied to reduce the degree of freedom order of the foundation model. The modal parameters of the foundation are estimated using the frequency response functions and their respective Fourier Transforms, obtained experimentally. An analysis of the frequency response of the complete system is accomplished considering physical co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. Convergence of the presented methodology is verified and the effect of the flexible foundation on the complete system response is analysed.
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An investigation on the influence of the Supporting Structure on the dynamics of the rotor system
Mechanical Systems and Signal Processing, 2005Co-Authors: Katia Lucchesi Cavalca, P. F. Cavalcante, E. P. OkabeAbstract:This work presents a methodology to analyse the influence of the foundation or Supporting Structure on the rotor-bearings system. The mathematical procedure applies a modal approach using modal parameters of generalised mass, damping ratio and natural frequencies. The Finite Elements Method is used to model the rotor. The linear model of the foundation is obtained by FEM and a modal approach is applied to reduce the degree of freedom order of the foundation model. The modal parameters of the foundation are estimated using the frequency response functions and their respective Fourier Transforms, obtained experimentally. An analysis of the frequency response of the complete system is accomplished considering physical co-ordinates for the rotor-bearings system and principal co-ordinates for the foundation. Convergence of the presented methodology is verified and the effect of the flexible foundation on the complete system response is analysed. © 2004 Elsevier Ltd. All rights reserved.
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Dynamical behaviour analysis of rotor Structure systems by a modal truncation method
Proceedings of the International Modal Analysis Conference - IMAC, 1991Co-Authors: Federico Cheli, Franco Giuseppe F.g. Dedini, Katia Lucchesi Cavalca, Andrea VaniaAbstract:This paper shows a mathematical method that allows the evaluation\nof the dynamic behavior of rotomachinery (considering the effects\nof the Supporting Structure). The vibrational response of the foundation\nat the rotor supports is calculated on the basis of its modal parameters.\nTherefore, the rotor vibrations are evaluated using physical coordinates,\nwhile the dynamic behavior of the Supporting Structure is evaluated\nin terms of modal coordinates. This method allows the consideration\nof a number of normal modes of the foundation lower than the number\nof the degree of freedom associated with connecting nodes between\nthe rotor and the foundation itself.
