Vertical Vibration Model for the Track Structure and the Vehicle

2021 ◽  
pp. 149-179
Author(s):  
Xiaoyan Lei
Keyword(s):  
Vertical Vibration ◽  
Track Structure ◽  
Vibration Model

Comparison of Vertical Model and Spatial Model for Vehicle-Track-Bridge Coupling Vibration System

2011 ◽  
Vol 243-249 ◽  
pp. 4307-4310
Author(s):  
Yuan Zhang ◽  
Wei Lin ◽  
Ze Ming Wang
Keyword(s):  
Vertical Vibration ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Advantages And Disadvantages ◽  
Vibration Model ◽  
Spectrum Density ◽  
Exciting Source ◽  
Vibration Responses ◽  
Track Bridge ◽  
Bridge System

In this paper, models for vertical and spatial coupling vibration of vehicle-track-bridge system are established separately. The track vertical irregularity sample in time domain is established by power spectrum density and taken as the exciting source to analyze the coupling vibration of vehicle-track-bridge system of two models. The advantages and disadvantages and applicability of the vertical vibration model and the spatial vibration model are analyzed by comparing the vertical vibration responses of the two models under excitation with same level of track vertical irregularity.

Study of Dynamic Analysis Model on Subway Vehicle-Tunnel Vertical Coupled System

2012 ◽  
Vol 170-173 ◽  
pp. 1497-1503
Author(s):  
Bo Liang ◽  
Hong Luo ◽  
Wei Qing
Keyword(s):  
Dynamic Analysis ◽  
Coupled System ◽  
Coupling Model ◽  
Vertical Vibration ◽  
The Body ◽  
Analysis Model ◽  
Vibration Equation ◽  
Vibration Model ◽  
Dynamic Coupling Model ◽  
Tunnel System

In this paper, vehicle systems and track-tunnel system are regarded as an interactional, mutual coupling overall system and the interaction between wheel and rail is regarded as the “ligament” of these two subsystems. The vehicle vibration model and vibration equation are established by considering the body vertical vibration, a suspension of vertical vibration and wheelset vertical vibration. By the displacement compatibility condition of the vehicle and track, integrating the vehicle equations and discretized track-tunnel vibration equation, the dynamic coupling model and the equations that reflect the vehicle-track systematicness is constituted. It provides a reference for the further research of the dynamic analysis of vehicle-tunnel coupled system.

Resistance of Soil to a Vertically Vibrating Pile

2013 ◽  
Vol 712-715 ◽  
pp. 979-983
Author(s):  
Zhan Shi Gao ◽  
Qing Ren
Keyword(s):  
Slenderness Ratio ◽  
Damping Ratio ◽  
Large Diameter ◽  
Three Dimensional ◽  
Horizontal Displacement ◽  
Vertical Vibration ◽  
Vibration Model ◽  
Couple Effect ◽  
Soil Dynamic ◽  
Strain Model

Based on the plane strain model, a three-dimensional vibration model was setup for soil dynamic response of soil surrounding large diameter pile. An accurate analytical solution was got by considering the couple effect of vertical and horizontal displacement of soil. Through the discussion parameters slenderness ratio (L/d), hysteretic damping ratio (Ds,Dv) and soil Poisson's ratio (ν),it is concluded that they are very important for the vertical vibration propproperties of soil impedance.

Control and Simulation on Vertical Vibration of Subway Rail via Magnetorheological Isolators

2012 ◽  
Vol 482-484 ◽  
pp. 1313-1316
Author(s):  
Rui Li ◽  
Li Min He ◽  
Xue Qin Li ◽  
Ke Long Chen
Keyword(s):  
Low Frequency ◽  
Vertical Vibration ◽  
Vibration System ◽  
Medium Frequency ◽  
Slab Track ◽  
Vibration Model ◽  
Active Vibration ◽  
Force Transmissibility ◽  
Stiffness Characteristics ◽  
Isolation Performance

A semi-active vibration system via magnetorheological (MR) isolators can contribute to enhance isolation performance. In this study, a vertical vibration model of subway rail via MR isolators was proposed. The adjustable damping and stiffness characteristics of isolator were also analyzed. Based on a floating slab track (FST) isolation model, a variable domain fuzzy control system was proposed to decrease the vertical vibration force. The results simulated in MATLAB indicate that compared with passive isolators, FST system via MR isolators decease vertical vibration force transmissibility ratio to 40% at low frequency (15Hz) and to 31% at medium frequency (30Hz).

scholarly journals Vertical Vibration Model for Unsteady Lubrication in Rolls-Strip Interface of Cold Rolling Mills

2012 ◽  
Vol 4 ◽  
pp. 734510 ◽  
Author(s):  
Xu Yang ◽  
Qing Li ◽  
Chao-nan Tong ◽  
Qi-han Liu
Keyword(s):  
Cold Rolling ◽  
Vertical Vibration ◽  
Rolling Mills ◽  
Vibration Model ◽  
Cold Rolling Mills

scholarly journals Path Transmissibility Analysis Considering Two Types of Correlations in Hydropower Stations

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Baoping Zhi ◽  
Zhenyue Ma
Keyword(s):  
Perturbation Method ◽  
Synthesis Method ◽  
Stochastic Perturbation ◽  
Vertical Vibration ◽  
Complex Situation ◽  
Transfer Path ◽  
Vibration Model ◽  
Head Cover ◽  
Stochastic Perturbation Method ◽  
Hydropower Stations

A new vibration model is built by introducing the head-cover vibration transfer path based on a previous analysis of the vertical vibration model for hydropower station units and powerhouses. This research focuses on disturbance- and parameter-related transfer paths in a practical situation. In a complex situation, the application of the stochastic perturbation method is expanded using an algebra synthesis method the Hadamard product, and theoretical analyses, and numerical simulations of transfer paths in the new vibration model are carried out through the expanded perturbation method. The path transfer force, the path transmissibility, and the path disturbance ranges in the frequency domain are provided. The results indicate that the methods proposed in this study can efficiently reduce the disturbance range and can accurately analyze the transfer paths of hydraulic-source vertical vibration in hydropower stations.

scholarly journals Behavior and Control of the Ballastless Track-Subgrade Vibration Induced by High-Speed Trains Moving on the Subgrade Bed with Mud Pumping

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Junjie Huang ◽  
Qian Su ◽  
Ting Liu ◽  
Wei Wang
Keyword(s):  
High Speed ◽  
Visual Observation ◽  
Vertical Vibration ◽  
Track Structure ◽  
Test Results ◽  
Low Viscosity ◽  
Ballastless Track ◽  
High Speed Trains ◽  
Mud Pumping ◽  
And Control

This paper investigates behavior and control of the ballastless track-subgrade vibration induced by high-speed trains under mud pumping occurring in the subgrade bed. The characteristics of mud pumping occurring in the subgrade bed under the ballastless track structure are analyzed by visual observation and nondestructive testing. Then, based on the injection of the low-viscosity epoxy resin (LVER), the repair procedures for the mud pumping are proposed. A variety of on-site tests are performed on the ballastless track-subgrade with and without mud pumping and also after mud pumping reinforcement to analyze the vibration of the ballastless track-subgrade under the high-speed trains. The test results show that mud pumping can significantly increase the vertical vibration acceleration and displacement of the ballastless track structure and slightly decrease the vibration of subgrade surface. After mud pumping reinforcement, the abnormal vibration of the ballastless track-subgrade can be effectively controlled to make the vibration close to normal. In addition, the vibration ratio of the subgrade surface to the concrete base is proposed as a way to evaluate the effectiveness of the reinforcement of the mud pumping using the LVER, based on the vibration attenuation feature of the ballastless track-subgrade.

Research on Six DOF Vertical Vibration Model of a Four Roller Hot Strip Rolling Mill Stand

2011 ◽  
Vol 279 ◽  
pp. 301-306
Author(s):  
Wei Jin Ma ◽  
Jun Yuan Wang ◽  
Feng Lan Li ◽  
Zhi Qiang Zeng ◽  
Deng Hong Xiao ◽  
...  
Keyword(s):  
Rolling Mill ◽  
Vertical Vibration ◽  
Hot Strip Rolling ◽  
Lumped Mass ◽  
Strip Rolling ◽  
Hot Strip ◽  
Vibration Model ◽  
Excited Vibration ◽  
Mill Stand ◽  
Six Dof

A lumped mass model with six degrees of freedom for the vertical vibration of four roller hot strip rolling mill stand was proposed, while its natural frequencies were calculated by MATLAB software. The numerical calculation results were proved more accurate through field vibration test. This vertical vibration model can be applied for dynamic simulation and structural dynamic modification with important theoretical and practical significance in mastering the vibration characteristics of four-roll mill, avoiding vertical self-excited vibration and improving production efficiency.

Research on the vibration model and vibration performance of cold orbital forging machines

2021 ◽  
pp. 095440542110450
Author(s):  
Lin Hua ◽  
Mingzhang Chen ◽  
Xinghui Han ◽  
Xuancheng Zhang ◽  
Fangyan Zheng ◽  
...  
Keyword(s):  
Dynamic Models ◽  
Vertical Vibration ◽  
Absolute Difference ◽  
Equivalent Stiffness ◽  
External Excitation ◽  
Horizontal Vibration ◽  
Equivalent Damping ◽  
Vibration Model ◽  
Vibration Performance ◽  
Orbital Forging

The vibration of cold orbital forging (COF) machines is a major issue for the quality of forging parts. It is therefore necessary to investigate the vibration of COF machines and provide some effective methods for reducing the vibration. In this paper, horizontal and vertical dynamic models of COF machines are established. These dynamic models are then effectively verified by conducting experiments. By using dynamic models of the COF machine, the vibration performance of the COF machine is investigated. To investigate methods for reducing the vibration of the COF machine, the effects of some key parameters on the vibration of the COF machine are studied, which include the eccentricities and rotation angular speeds of the inner eccentricity ring and the outer eccentricity ring, the amplitude and frequency of external excitation, and the equivalent stiffness and equivalent damping between swing shaft and bearing. Investigative conclusions can be drawn: During the COF process, vertical vibration is more drastic than horizontal vibration. A larger absolute difference between the eccentricities of the inner eccentricity ring and the outer eccentricity ring contributes to reducing the horizontal vibration of the COF machine. A larger equivalent stiffness and a larger equivalent damping between the swing shaft and bearing, a smaller amplitude and a smaller frequency of the external excitation contribute to reducing the vertical vibration of the COF machine.

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