Effect of Wheel Pressure on Vibration of Straddle Monorail Transit Vehicle-Bridge System

2014 ◽  
Vol 919-921 ◽  
pp. 542-546
Author(s):  
Guo Liu ◽  
Bo Jang ◽  
Zhi Hui Zhou ◽  
Qing Yuan Zeng
Keyword(s):  
Steering Wheel ◽  
Transit System ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Lateral Response ◽  
Vibration Model ◽  
System Vibration ◽  
Bridge System

The monorail beam (Z206-25) of Chongqing straddle monorail transit system was selected as the research object. The spatial coupling vibration model of vehicle-bridge system was established and corresponding procedure was compiled. The effect of travelling, steering and stabilizing wheel pressure respectively and typical combined wheel pressure on the system vibration was studied. The results show that the change of wheel pressure has great effect on the response of the system. The vertical response value increases with travelling wheel pressure increasing. The lateral response value increases with steering wheel pressure increasing, while the effect of stabilizing wheel pressure on the response is irregular. The effect of steering wheel pressure is greater than that of stabilizing wheel pressure on lateral responses. The effect of all of travelling and steering wheel pressure is greater than that of unilateral wheel pressure on the response. The effect tendency of stabilizing wheel pressure on the response is opposite to that of unilateral wheel pressure.

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.

Spatial Coupling Vibration of Vehicle-Track-Bridge System due to Different Track Irregularities

2011 ◽  
Vol 255-260 ◽  
pp. 1735-1739
Author(s):  
Yuan Zhang
Keyword(s):  
Power Spectrum Density ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Spectrum Density ◽  
Exciting Source ◽  
Vibration Responses ◽  
Track Irregularity ◽  
Track Bridge ◽  
Track Irregularities ◽  
Bridge System

Track irregularity is one of the most important factors that induce vehicle-track-bridge coupling vibration. In this paper, spatial model of vehicle- track-bridge system is established. The track irregularity sample in time domain are established by power spectrum density and taken as the exciting source to analyze the spatial coupling vibration of vehicle-track-bridge system. By comparing the vibration responses of the model excited by vertical profile irregularity and the model excited by four different irregularities, the change of track irregularities have mostly influence on the vibration of the parts above the rail and nearly no influence on the parts under the rail and bridge.

Analysis of Vehicle Lateral Response During Regenerative Braking in a Turn

2016 ◽  
Author(s):  
C. S. Nanda Kumar ◽  
Shankar C. Subramanian
Keyword(s):  
Rear Wheel ◽  
Front Wheel ◽  
Lateral Acceleration ◽  
Regenerative Braking ◽  
Steering Wheel ◽  
Slip Angle ◽  
Lateral Response ◽  
Wheel Drive ◽  
Reference Track ◽  
The Impact

Regenerative braking is applied only at the driven wheels in electric and hybrid vehicles. The presence of brake force only at the driven wheels reduces the lateral traction limit of the corresponding tires. This impacts the vehicle lateral response, particularly while applying the regenerative brake in a turn. In this paper, a detailed study was made on the impact of regenerative brake on the vehicle lateral response in front wheel drive and rear wheel drive configurations on dry and wet asphalt road surfaces. Simulations were done considering a typical set of vehicle parameters with the IPG CarMaker® software for different drive conditions and braking configurations along the same reference track. The steering wheel angle, yaw rate, lateral acceleration, vehicle slip angle, and tire forces were obtained. Further, they were compared against the conventional all wheel friction brake configuration. The regenerative braking configuration that had the most impact on vehicle lateral response was analyzed and response variations were quantified.

Wheel-Set Hunting Movement and its Contribution to Coupling Vibration of Vehicle-Bridge System

2013 ◽  
Vol 16 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Q. Cheng ◽  
N. Zhang ◽  
H. Xia ◽  
T. Zhang ◽  
X.T. Du
Keyword(s):  
Coupling Vibration ◽  
Bridge System

Investigation of a Vibration Reduction System for Vehicle Seats by a Vibration Model Consisting of a Vehicle, Seat, and Human Body

2013 ◽  
Author(s):  
S. Ota ◽  
S. Nishiyama ◽  
T. Nakamori
Keyword(s):  
Mechanical Properties ◽  
Human Body ◽  
Vibration Reduction ◽  
Steering Wheel ◽  
The Road ◽  
Reduction System ◽  
Vibration Model ◽  
Comparison Results ◽  
Vertical Vibrations ◽  
Calculation System

This paper describes a vibration reduction system that can minimize the vertical vibrations of the human body in a vehicle. This system can control the mechanical properties of the seat cushions, such as the spring constants and damping coefficients. To examine the feasibility of this vibration reduction system, we design a vibration model of both an occupant–seat–steering wheel–pedals–vehicle system and a calculation system. Further, we carry out a numerical analysis to calculate the magnitude of vibrations transmitted from the road surface to the human body based on ISO7096-EM6. Comparison results of the frequency response between the analysis and the experiment indicate the feasibilities of both the vibration model and the analysis method. Furthermore, vibration of the head was reduced 60.1% by controlling the mechanical properties of the seat from 1/5 to 5 times. In summary, the in-vehicle vibration reduction system successfully reduces vibrations from the seat to the human body.

scholarly journals A coupling vibration model of multi-stage pump rotor system based on FEM

Mechanika ◽  
2016 ◽  
Vol 22 (1) ◽  
Author(s):  
Leqin Wang ◽  
Wenjie Zhou ◽  
Xuesong Wei ◽  
Lulu Zhai ◽  
Guangkuan Wu
Keyword(s):  
Rotor System ◽  
Coupling Vibration ◽  
Pump Rotor ◽  
Multi Stage ◽  
Vibration Model

The Research of Hydraulic System Anti-Vibration and Noise Reduction

2011 ◽  
Vol 308-310 ◽  
pp. 1492-1496
Author(s):  
Zhi Yong He ◽  
Qing Hua He ◽  
Shang Hong He
Keyword(s):  
Differential Equation ◽  
Resonance Frequency ◽  
Hydraulic System ◽  
Frequency Conversion ◽  
Pipeline System ◽  
Pulsation Frequency ◽  
Hydraulic Pump ◽  
Coupling Vibration ◽  
System Pressure ◽  
System Vibration

In this paper, the hazards of hydraulic pipeline system vibration and noise were introduced, the causes of vibration and noise of hydraulic pump circuit were analyzed and its frequency components were discussed. A wave filter of structure resonator based on Fluid-structure coupling vibration is designed and manufactured according to the principle of gas muffler. The differential equation of rectangular plate transverse free vibration characteristics was established, the coupling vibration resonance frequency of filter structure vibration body was obtained about 218Hz by solving differential equation according to the Rayleigh - Ritz method. The hydraulic pump flow pulsation frequency was adjusted respectively 215.55 Hz and 197.4 Hz through frequency conversion motor adjustment, and then comparative experiments were tested on the hydraulic system pressure fluctuation test experimental platform. Experiments show that, when the inherent resonance frequency of filter structural vibration body was approached the hydraulic system frequency, system pulse energy would be effectively attenuated, system pressure fluctuations would be greatly reduced and pulse rate was dropped from 3.65％to 0.28％. The attenuation of the effects of pressure pulsations was validated through experimental research, but also its defects that the filter has frequency selectivity and band narrow were founded The later research direction was put forward and new technology for hydraulic system vibration control was provided.

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