scholarly journals Catalogue of Vibration Reduction Index Formulas for Heavy Junctions Based on Numerical Simulations

2017 ◽  
Vol 103 (4) ◽  
pp. 624-638 ◽  
Author(s):  
Jordi Poblet-Puig ◽  
Catherine Guigou-Carter
Keyword(s):  
Numerical Simulations ◽  
Vibration Reduction ◽  
Index Formulas ◽  
Reduction Index

In situ evaluation of the vibration reduction index Kij

2008 ◽  
Vol 123 (5) ◽  
pp. 3615-3615
Author(s):  
Arianna Astolfi ◽  
Alessandro Schiavi ◽  
Cristiana Taricco ◽  
Simone Geroso ◽  
Fabrizio Bronuzzi ◽  
...  
Keyword(s):  
Vibration Reduction ◽  
Reduction Index

The Vibration Reduction Index Kij: Laboratory Measurements for Rigid Junctions and for Junctions with Flexible Interlayers

2006 ◽  
Vol 13 (2) ◽  
pp. 99-111 ◽  
Author(s):  
Charlotte Crispin ◽  
Bart Ingelaere ◽  
Manuel Van Damme ◽  
Debby Wuyts
Keyword(s):  
Vibration Reduction ◽  
Laboratory Measurements ◽  
Reduction Index

Vibration Reduction Index of a T-Junction With a Flexible Interlayer

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
J. Alba ◽  
E. Escuder ◽  
J. Ramis ◽  
R. Del Rey ◽  
E.G. Segovia
Keyword(s):  
Near Field ◽  
Vibration Reduction ◽  
Scale Model ◽  
Reliable Prediction ◽  
The Cost ◽  
Elastic Layers ◽  
Sound Reduction ◽  
Predictive Formulas ◽  
Expression Of Uncertainty ◽  
Reduction Index

This paper describes the procedure followed to evaluate the vibration reduction index for T-junctions with inserted flexible elements and proposes new equations to complement the standard EN 12354-1:2000. The experiment described in this work is based on a 1:3 scale model of a T-junction with a flexible interlayer. It was used to obtain a significant reduction in the cost of the configurations under study. We chose to carry out vibration measurements by near-field acoustic holography (NAH) in order to avoid the risk of accelerometer interference. Flanking transmission was determined for different elastic layers with the objective of quantifying the effect of the flexible interlayer and to compare the results obtained with predictive formulas. The results enabled us to propose new equations to complement EN 12354-1:2000 for the reliable prediction of the apparent sound reduction index. The uncertainty associated with the different average velocity levels is determined according to the Guide for the Expression of Uncertainty of Measurement (GUM).

Vibration Reduction and Isolation by On-Off Control of Friction Force at Spring Support

1997 ◽  
Author(s):  
Hideya Yamaguchi ◽  
Masahito Yashima ◽  
Yoshinori Hirayama
Keyword(s):  
Energy Dissipation ◽  
Control Theory ◽  
Numerical Simulations ◽  
Friction Force ◽  
Transient Response ◽  
Vibration Reduction ◽  
Variable Structure ◽  
Variable Structure Systems ◽  
Switching Law ◽  
Spring Support

Abstract This paper presents a new method of on-off control for the spring support to reduce and isolate vibration transmitted to machines or structures. The procedure utilizes the auxiliary spring whose end is designed to control the clamping friction force with the brake mechanism. The clamping friction force is varied according to the switching law that is deduced from the variable structure systems (VSS) control theory taking into account the energy dissipation due to friction. The experiments and numerical simulations confirmed the effectiveness of the proposed method by investigating the transient response and the displacement transmissibility.

scholarly journals Numerical Evaluation of the Vibration Reduction Index for Structural Joints

2012 ◽  
Vol 37 (2) ◽  
Author(s):  
Jaime Ramis ◽  
Enrique Segovia ◽  
Jesús Alba ◽  
Jesús Carbajo ◽  
Luís Godinho
Keyword(s):  
Numerical Evaluation ◽  
Vibration Reduction ◽  
Structural Joints ◽  
Reduction Index

scholarly journals Vibration reduction for structures: distributed schemes over directed graphs

2019 ◽  
Vol 25 (14) ◽  
pp. 2025-2042 ◽  
Author(s):  
Xueji Zhang ◽  
Goele Pipeleers ◽  
Kristian Hengster-Movrić ◽  
Cassio Faria
Keyword(s):  
Computational Complexity ◽  
Numerical Simulations ◽  
Directed Graphs ◽  
Vibration Reduction ◽  
Flexible Structures ◽  
Communication Overhead ◽  
Communication Graph ◽  
Traditional Methods ◽  
Control Engineering ◽  
Graph Topology

This paper aims to bridge the gap between control engineering and vibration engineering. We developed three distributed schemes over directed communication graph topology, specifically for vibration reduction of flexible structures. Under the distributed schemes, vibrations are attenuated through agents consisting of distributed observers and controllers. Compared to traditional methods, the developed approaches can reduce the communication overhead and the computational complexity when a large number of actuators and sensors are deployed. Moreover, two of the developed schemes enjoy the flexibility in reconfiguration of communication graph topology and integration of redundant agents. Furthermore, numerical simulations are presented to demonstrate the effectiveness of the developed schemes in vibration reduction of flexible structures.

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