scholarly journals Effect of the coupled oscillatory system on impact oscillations between a pantograph and a rigid conductor line

2020 ◽  
Vol 86 (881) ◽  
pp. 19-00251-19-00251
Author(s):  
Naoto NISHIYAMA ◽  
Kiyotaka YAMASHITA
Keyword(s):  
Oscillatory System ◽  
Conductor Line ◽  
Impact Oscillations

Numerical Bifurcation Analysis of Multimode Impact Oscillations Between a Pantograph and a Rigid Conductor Line

2012 ◽  
Author(s):  
Kiyotaka Yamashita ◽  
Tomoaki Nakayama ◽  
Toshihiko Sugiura ◽  
Hiroshi Yabuno
Keyword(s):  
Bifurcation Analysis ◽  
Numerical Technique ◽  
Single Mode ◽  
Current Collection ◽  
Conductor Line ◽  
Mode Solution ◽  
Numerical Bifurcation ◽  
The Impact ◽  
Impact Oscillations ◽  
Numerical Bifurcation Analysis

This paper deals with the numerical bifurcation analysis of the contact loss between a pantograph and an overhead rigid conductor line in a railway current collection system. In the previous study, we modeled this problem as impact oscillations of an intermediate spring-supported beam excited by an oscillating plate. We have already derived the modal interaction relationship equations that describe the velocities immediately after an impact as functions of the velocities before impact for each vibration mode. A numerical calculation using these relationship equations was performed to clarify the impact oscillations with multiple vibration modes. In this paper, we propose a numerical technique based on maps that transform the state of the system at the impact to the subsequent state at the next impact. This numerical method produces stability analyses of the fixed points of the map that describes an impact oscillation with multiple modes. These results can differ surprisingly from the expectations based on a single-mode solution. These results are compared with experiments undertaken in our laboratory, utilizing a thin stainless steel beam. The typical features of impact oscillations, which were theoretically predicted, were confirmed qualitatively.

scholarly journals Oscillation modes of vibrating feeders with vibro-impact adaptive drive at the output of reflacted ore from chambers of wining blocks

2019 ◽  
Vol 109 ◽  
pp. 00087
Author(s):  
Heorhii Shevchenko ◽  
Oleksandr Sushchenko ◽  
Halyna Zozulia
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Oscillatory System ◽  
Oscillation Modes ◽  
Efficiency And Productivity ◽  
Impact Oscillations ◽  
Vibrating Feeders ◽  
Elastic Elements ◽  
Increasing Load

The oscillation modes of vibrating feeders with vibro-impact adaptive drive are researched, which are intended for output and loading of reflacted ore from chambers of wining blocks at underground mining, or other bulk media from bunkers and so on, under complicated vibration conditions. The resonant polyfrequency oscillations of the impactor of the vibro-impact drive of feeders with such drive in vibro-impact modes are excited, which through one-side elastic elements are transmitted to the feeder tray, and in the pillar of the reflacted ore in the chamber above the tray. With increasing load from the ore on the tray there is an increase in the intensity of the impactor vibration of the feeder vibro-impact drive with accelerations in hundreds m/s2. Such oscillations increase the depth of dissemination of vibrational effects in a pillar of reflacted ore above the tray, which increases the efficiency and productivity of vibration output. Depending on the feeders parameters in its oscillatory system, various modes of vibro-impact oscillations are excited. The task of choosing the mode of variation of the feeder is to choose such parameters, which would ensure efficient vibration output of the rock mass and reliability of its operation.

Impact oscillations with multiple modes between a pantograph and an overhead rigid conductor line in a railway current collection system

2010 ◽  
Vol 18 (4) ◽  
pp. 499-508 ◽  
Author(s):  
Kiyotaka Yamashita ◽  
Kotaro Kitajo ◽  
Shou Wada ◽  
Toshihiko Sugiura ◽  
Hiroshi Yabuno
Keyword(s):  
Collection System ◽  
Multiple Modes ◽  
Current Collection ◽  
Conductor Line ◽  
Impact Oscillations

Fundamental Study on Impact Oscillations Between a Pantograph and an Overhead Rigid Conductor Line in a Railway Current Collection System

2008 ◽  
Author(s):  
Kotaro Kitajo ◽  
Masatsugu Yoshizawa ◽  
Satoshi Kawamura
Keyword(s):  
Contact Problems ◽  
The State ◽  
Fundamental Study ◽  
Current Collection ◽  
Railway System ◽  
Conductor Line ◽  
Impact Problems ◽  
The One ◽  
Relationship Of ◽  
Impact Oscillations

The contact problems between the rigid conductor line and the pantograph in a current railway system are studied from the viewpoint of nonlinear dynamics. It is assumed that there are impact oscillations between the rigid conductor line and the pantograph under the state of contact loss. The rigid conductor line pantograph system is modeled with a spring-supported beam excited by an oscillating body. First, we approached as an impact problem and theoretically examined by using this model. As a result, periodical impact oscillations were shown in low moving velocities of body. Second, we employed the method of mapping to clarify impact problems, and we obtained the relationship of the state of the system at the arbitrary impact to that at the next impact. Finally, the experiments are conducted with the simple experimental model using dimensionless parameters which are equal to the one of the analytical model.

Preliminary Investigations of Machine Frame Vibration Damping Using Eddy Current Principle

2016 ◽  
Vol 821 ◽  
pp. 288-294 ◽  
Author(s):  
George Juraj Stein ◽  
Peter Tobolka ◽  
Rudolf Chmúrny
Keyword(s):  
Mathematical Model ◽  
Natural Frequency ◽  
Eddy Current ◽  
Asynchronous Motor ◽  
Oscillatory System ◽  
Vibration Damping ◽  
Combined Effects ◽  
Magnetic Forces ◽  
Novel Approach ◽  
Vibration Attenuation

A novel approach to vibration attenuation, based on the eddy current principle, is described. The combined effects of all magnetic forces acting in the oscillatory system attenuate frame vibrations and, concurrently, decrease the damped natural frequency. A mathematical model of the forces balance in the oscillatory system was derived before. Some experimental results from a mock-up machine frame excited by an asynchronous motor are presented.

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