scholarly journals Reduction of flexural vibration of railway vehicle carbody by using elastic torus (Validation of vibration reduction effect using actual railway vehicle and numerical investigations on the vibration reduction mechanism)

2017 ◽  
Vol 83 (846) ◽  
pp. 16-00342-16-00342 ◽  
Author(s):  
Takahiro TOMIOKA ◽  
Satoshi TACHIKAWA ◽  
Yuki AKIYAMA ◽  
Ken-Ichiro AIDA
Keyword(s):  
Vibration Reduction ◽  
Flexural Vibration ◽  
Railway Vehicle ◽  
Reduction Mechanism ◽  
Numerical Investigations ◽  
Reduction Effect

scholarly journals Multimodal Reduction of Elastic Vibrations in Plate Structure using Super Absorbent Polymer Beads

2020 ◽  
Vol 3 (1) ◽  
pp. 21-29
Author(s):  
Takahiro Tomioka ◽  
Karen Minamisawa
Keyword(s):  
Vibration Reduction ◽  
Basic Mechanism ◽  
Vibration Measurement ◽  
Scale Model ◽  
Railway Vehicle ◽  
Polymer Beads ◽  
Super Absorbent Polymer ◽  
Elastic Vibrations ◽  
Reduction Effect ◽  
Absorbent Polymer

This paper deals with multimodal reduction of structural elastic vibrations. Super absorbent polymer beads (SAP beads) have been introduced as a simple damping device inspired by the multimodal vibration reduction effect by passengers on railway vehicles. A series of vibration measurement tests using a 1:10 scale model of railway vehicle floor structure (model underframe) was carried out. The SAP beads which are sold commonly as water retention agent were stacked in a container and applied to the model underframe. From the experiments, multimodal vibration reduction effects have been demonstrated. A drastic difference has been observed when water was added together with SAP beads. To investigate the basic mechanism of the damping effect obtained by the experiments, an analytical model, which consists of multiple masses that are supported at an angle to each other, and its simplified model was proposed and numerical studies were conducted. Some specific combinations of the mass, spring, and damping elements in the model could express the experimental results well, and it has been estimated from the numerical results that each SAP layer act as an un-uniform subsystem.

Research on Vibration Reduction Mechanism for Robot Joints by Imitating the Owl Surface Characteristics

2014 ◽  
Vol 539 ◽  
pp. 13-17
Author(s):  
Shao Ming Sun ◽  
Dong Sen Ye ◽  
Xuan Wu
Keyword(s):  
Vibration Reduction ◽  
Surface Characteristics ◽  
Structure And Function ◽  
Reduction Mechanism ◽  
Element Analysis ◽  
Vibration Problems ◽  
Reduction Effect ◽  
Solid Works ◽  
Joint Vibration ◽  
And Function

On the base of bionics and mechanics of vibration, the mechanism of the structure and function of robot joint vibration reduction was researched for more and more prominent vibration problems in the design of the robot. Drawing the model by Solid works and making finite element analysis (FEA) by Abaqus, vibration frequency was analyzed on different condition, exploring the influence of vibration of robot joint with and without package coatings as well as with and without holes in the package coatings. The experiment and simulation result showed that vibration reduction effect was obvious in robot joint covering package coatings with high punching rate.

scholarly journals Experimental Study on the Vibration Control Effect of Long Elastic Sleeper Track in Subways

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaopei Cai ◽  
Dacheng Li ◽  
Yanrong Zhang ◽  
Qian Miao ◽  
Rixin Cui
Keyword(s):  
Vibration Reduction ◽  
Field Tests ◽  
Urban Rail Transit ◽  
Control Effect ◽  
Tunnel Wall ◽  
Vibration Effect ◽  
Urban Rail ◽  
Vertical Displacements ◽  
Curved Track ◽  
Reduction Effect

The vibration effect of urban rail transit has gained attention from both academia and the industry sector. Long Elastic Sleeper Track (LEST) is a new structure for vibration reduction which has recently been designed and applied to Chinese subways. However, little research has been devoted to its vibration reduction effect. In this study, field tests were conducted during peak transit hours on Beijing Subway Line 15 to examine the vibration reduction effects of the common ballastless track and LEST on both straight and curved sections. The results demonstrate that although LEST increases the wheel-rail vertical forces, rail vertical displacements, and rail accelerations to some extent, these effects do not threaten subway operational safety, and vibrations of track bed and tunnel wall are positively mitigated. LEST has an obvious vibration reduction effect at frequencies above 40 Hz. In straight track, the vibration of bottom of the tunnel wall measured in one-third octave bands is reduced by 10.52 dB, while the vibration at point on the tunnel wall at 1.5 m height is reduced by 9.60 dB. For the curved track, the vibrations at those two points are reduced by 9.35 dB and 8.44 dB, respectively. This indicates that LEST reduces vibrations slightly more for the straight track than for the curved track.

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