Effect of Track Measuring Beam on the Dynamic Properties of Rail Inspection Car

2013 ◽  
Vol 321-324 ◽  
pp. 27-32
Author(s):  
Long Fa Wu ◽  
Hao Dong
Keyword(s):  
Dynamic Model ◽  
Critical Velocity ◽  
Vibration Mode ◽  
Dynamic Properties ◽  
Ride Quality ◽  
Vibration Acceleration ◽  
Bogie Frame ◽  
Negotiation Performance ◽  
Rail Inspection ◽  
Curve Negotiation

The track measuring beam is installed in the bogie frame to measure the geometry parameters of the rail. In this paper, the dynamic model of the inspection car was established in order to compare the dynamic properties of the vehicle with and without track measuring beam installation. The motion stability, ride quality, vibration acceleration and curve negotiation performance of the vehicle after the track measuring beam installed were investigated. The results show that after the track measuring beam installation the critical velocity of the inspection car decreases, but the running at speed of 120km/h can be guaranteed. The track measuring beam has no influence on the ride quality and curve negotiation performance and the effect of it on vibration mode is little.

Influence of Curve Geometric Parameters on the Curve Negotiation Performance of Hot-Metal-Car

2013 ◽  
Vol 385-386 ◽  
pp. 105-108
Author(s):  
Guo Sheng Feng ◽  
Huai Yin Liu ◽  
Su Mei Jia ◽  
Chao Wang
Keyword(s):  
Dynamic Model ◽  
Theoretical Foundation ◽  
Geometric Parameters ◽  
Moment Of Inertia ◽  
Analysis Model ◽  
Hot Metal ◽  
Open Type ◽  
Negotiation Performance ◽  
The Moment ◽  
Curve Negotiation

To meet the need of an open type of 140t hot-metal-car for improving design, the analysis model of the main parts was built up by using Pro/E software, and the moment of inertia of each component was calculated.Then the Pro/E model was imported into ADAMS/Rail for assembling to finish a hot-metal-car dynamic model. The possibility of derailment and the wheel/rail abrading were simulated and analyzed on the hot-metal-car. The result of analysis provides theoretical foundation for improvement design.

Improvement on Curve Negotiation Performance of Suspended Monorail Vehicle Considering Flexible Guideway

2020 ◽  
Vol 20 (05) ◽  
pp. 2050057
Author(s):  
Qinglie He ◽  
Chengbiao Cai ◽  
Shengyang Zhu ◽  
Kaiyun Wang ◽  
Yongzhi Jiang ◽  
...  
Keyword(s):  
Interaction Model ◽  
Dynamic Responses ◽  
Secondary Development ◽  
Design Parameters ◽  
Lateral Vibration ◽  
Vibration Level ◽  
Radial Stiffness ◽  
Negotiation Performance ◽  
Lateral Displacements ◽  
Curve Negotiation

This work presents the investigation and improvement on curve negotiation performance of suspended monorail vehicle considering a flexible guideway. First, a spatial train–guideway interaction model of suspended monorail system (SMS) is established based on the secondary development of ANSYS software. Then, the dynamic analysis of the train over the flexible curved guideway is conducted, and the curve negotiation performance of the vehicle and the guideway vibration feature are revealed. Subsequently, several crucial design parameters that significantly influence the curve negotiation performance of the vehicle are found, and their influences on the train–guideway dynamic responses are systematically investigated. Finally, by comprehensively considering the dynamic indexes of the vehicle–guideway system, the optimal ranges of these crucial design parameters are obtained. Results show that decreasing the radial stiffness of guiding tyre can effectively reduce the lateral vibration levels of vehicle and guideway, but it would increase the lateral displacements of the bogie and hanging beam; and the radial stiffness is finally suggested to be around 1[Formula: see text]kN/mm by comprehensively considering all dynamic indexes. Increasing the initial compression displacement of guiding tyre can well limit the lateral displacements of the bogie and the hanging beam, thus enhancing the train running safety; however, it would intensify the vehicle-guideway lateral vibration level; especially, the optimal initial compression displacement of guiding tyre is related to its radial stiffness characteristics. To ensure a good curve negotiation performance of vehicle and guideway vibration level, the stiffness of the anti-roll torsion bar and the initial gradient angle of the installed trapezoid four-link suspended device are suggested to be 1.0[Formula: see text]MNm/rad and 65–[Formula: see text], respectively.

scholarly journals Computer aided structural analysis of newly developed railway bogie frame

2018 ◽  
Vol 157 ◽  
pp. 02051 ◽  
Author(s):  
Pavol Šťastniak ◽  
Marián Moravčík ◽  
Peter Baran ◽  
Lukáš Smetanka
Keyword(s):  
Structural Analysis ◽  
Research And Development ◽  
Simulation Model ◽  
Dynamic Properties ◽  
Structure Design ◽  
Bogie Frame ◽  
Structural Funds ◽  
Innovative Research ◽  
Computer Aided ◽  
Computational Procedures

The paper is part of the publication series, which describe the most significant and innovative research and development design solutions and computational procedures as part of European structural funds project. The object of this article is strength conditions assessment of new structure of rail bogie frame, which is characterized mainly by better dynamic properties while driving on the track, good operational properties and higher safety against derailment. For validation of the new structure design, there has been created a substitute simulation model. Results of calculations and prototype tests prove, that new structure of the bogie frame satisfies strength assessments.

Novel Precision PZT-Driven Micropositioning Stage with Large Travel Range

2009 ◽  
Vol 407-408 ◽  
pp. 159-162
Author(s):  
Hua Wei Chen ◽  
Ichiro Hagiwara
Keyword(s):  
Dynamic Model ◽  
Piezoelectric Actuator ◽  
Dynamic Properties ◽  
Flexure Hinge ◽  
Slip Model ◽  
Stick Slip ◽  
Friction Effect ◽  
Simulation Results

One novel long-travel piezoelectric-driven linear micropositioning stage capable of moving in a stepping mode is developed. The stick-slip friction effect between flexure hinge actuation tips with a sliding stage is used to drive the stage step-by-step through an enlarged displacement of piezoelectric actuator. In order to enlarge the travel range, magnifying mechanism is optimally designed by use of flexure hinge and lever beam. Moreover, dynamic model of such stage is proposed by consideration of reset integrator stick-slip model. The simulation results show that the stage has considerable good dynamic properties.

scholarly journals Modeling and Dynamic Analysis of Cutterhead Driving System in Tunnel Boring Machine

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Wei Sun ◽  
Honghui Ma ◽  
Xueguan Song ◽  
Lintao Wang ◽  
Xin Ding
Keyword(s):  
Dynamic Model ◽  
Vibration Mode ◽  
Tunnel Boring Machine ◽  
Torque Ripple ◽  
Transmission System ◽  
Gear Transmission ◽  
Driving System ◽  
Tunnel Boring ◽  
Gear Transmission System ◽  
Driving Torque

Failure of cutterhead driving system (CDS) of tunnel boring machine (TBM) often occurs under shock and vibration conditions. To investigate the dynamic characteristics and reduce system vibration further, an electromechanical coupling model of CDS is established which includes the model of direct torque control (DTC) system for three-phase asynchronous motor and purely torsional dynamic model of multistage gear transmission system. The proposed DTC model can provide driving torque just as the practical inverter motor operates so that the influence of motor operating behavior will not be erroneously estimated. Moreover, nonlinear gear meshing factors, such as time-variant mesh stiffness and transmission error, are involved in the dynamic model. Based on the established nonlinear model of CDS, vibration modes can be classified into three types, that is, rigid motion mode, rotational vibration mode, and planet vibration mode. Moreover, dynamic responses under actual driving torque and idealized equivalent torque are compared, which reveals that the ripple of actual driving torque would aggravate vibration of gear transmission system. Influence index of torque ripple is proposed to show that vibration of system increases with torque ripple. This study provides useful guideline for antivibration design and motor control of CDS in TBM.

Establishment of Mathematical Model of Buried Pipeline on Nonlinear Soil Dynamic Model

2012 ◽  
Vol 452-453 ◽  
pp. 334-338 ◽  
Author(s):  
Ting Yue Hao
Keyword(s):  
Dynamic Model ◽  
Vibration Mode ◽  
Beam Model ◽  
Viscoelastic Foundation ◽  
Buried Pipeline ◽  
Critical Flow Velocity ◽  
Pipe Model ◽  
Foundation Model ◽  
Soil Dynamic ◽  
Elastic Foundation Beam

The pipe model is simplified as elastic foundation beam model of Euler-Bernoulli in the paper, the supported form of pin rocker bearing in the analysis of transverse vibration. Kelvin viscoelastic foundation model is adopted and the dynamic model of soil spring is regarded as nonlinearity. Applying the principle of Hamilton, the differential equation of vibration is deduced. By utilization of the first three-order modal and the orthogoality of main vibration mode, the equations are discreted and transformed into state formulas. The critical flow velocity is obtained using the Matlab software in a typical numerical example.

scholarly journals Simulation of Nose Landing Gear Shimmy with Flexible Airframe Considered

2018 ◽  
Vol 36 (2) ◽  
pp. 388-395
Author(s):  
Yi Chen ◽  
Rongyao Cui ◽  
Rongbo Ju ◽  
Qingbo Dou
Keyword(s):  
Critical Velocity ◽  
Dynamic Characteristics ◽  
Vibration Mode ◽  
Landing Gear ◽  
Stable Region ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Tire Stiffness ◽  
Passenger Aircraft ◽  
Critical Damping

Shimmy stability of the nose landing gear of an aircraft is studied in this paper. Firstly, Shimmy model was built considering the dynamic characteristics of the airframe. Then the critical damping, critical velocity and frequency range of the shimmy are obtained by introducing relevant parameters into the shimmy model. The research shows that the problem of shimmy is a tire type shimmy caused by insufficient damping of dampers and brings coupled resonance with the vibration mode of the airframe, which can be avoided by increasing the damping of the shimmy. At the same time, the influence of airframe dynamics and tire stiffness on the shimmy characteristics of the landing gear is also studied. With the increase of tire torsion and lateral stiffness, the critical velocity, maximum critical damping value and shimmy frequency of the landing gear increase. However, the elasticity of the airframe makes the frequency of the aircraft landing gear lower and the stable region of the shimmy smaller, so that the phenomenon of shimmy is more likely to occur. Therefore, the influence of airframe dynamic characteristics can not be ignored when studying the shimmy stability of the landing gear of a modern large passenger aircraft.

Experimental and numerical investigations on longitudinal vibration of suspended monorail trains induced by bogie pitching motion

2021 ◽  
pp. 095440972110236
Author(s):  
Lai Wei ◽  
Jing Zeng ◽  
Caihong Huang ◽  
Qunsheng Wang ◽  
Wenlin Shen
Keyword(s):  
Longitudinal Vibration ◽  
Damping Ratio ◽  
Field Tests ◽  
Ride Quality ◽  
Longitudinal Vibrations ◽  
Bogie Frame ◽  
Pitch Motion ◽  
Harmonic Vibrations ◽  
Multibody Dynamic ◽  
Secondary Suspension

The longitudinal harmonic vibrations found in the suspended monorail train (SMT) seriously affected the ride quality and dynamic behaviour. In this work, the experimental and simulated analyses are carried out to reveal the essential phenomenon, occurring mechanism and possible solutions to this issue. Firstly, the ride quality and vibration transmission of the tested SMT system are investigated. It is found that the longitudinal vibrations with the frequency of 2.7Hz occur to the carbody, bogie frame and suspension of the train system. Due to the secondary suspension is lower than the gravity center of the bogie frame, the bogie pitch motion with low damping ratio can be easily excited. The longitudinal components of the bogie pitch motion will transfer to the carbody and wheelset through traction rod and primary suspension, respectively. After that, the multibody dynamic model of a suspended monorail train is developed. Based on the numerical model, some parametric simulations, e.g. rubber stiffness, traction rod height and secondary damping, etc., are carried out to propose solutions to relieve the longitudinal vibrations. Finally, the field tests for the SMT arranging the longitudinal dampers are conducted to verify its improvement to longitudinal vibrations.

Light Weight Freight Rolling Stock Bogie Frame: Design Methodology Validated with Field Oscillation Trials

2017 ◽  
Vol 9 (4) ◽  
Author(s):  
S. Shukla ◽  
U. Kumar ◽  
S.K. Sharma ◽  
P. Gupta ◽  
A. Kumar
Keyword(s):  
Weight Ratio ◽  
International Standards ◽  
Railway Track ◽  
Rolling Stock ◽  
Ride Quality ◽  
Element Analysis ◽  
Bogie Frame ◽  
Frame Design ◽  
Goodman Diagram ◽  
Indian Railway

Indian railway has improved the laden to tare weight ratio by producing lighter as well as higher strength bogie frame of freight rolling stock. Bogie frame is the crucial component of the rail vehicle which carries static load in the form of gross weight and dynamic loads arising from various track and wheel irregularities. The three piece freight vehicle bogie frame comprises two side frames and one bolster. The side frame; fitted with three piece bogie frame and responsible for the ride quality of the freight vehicle, is considered in present study. The locations suitable for weight reduction are found by finite element analysis (FEA), using side frame solid model in MSC FEA environment. International standards of the association of American railroad (AAR specification M-203) [1] load cases and boundary conditions are deployed for analysis in the context of the operating scenario of Indian railways. Typical Indian railway track signatures are used as input for transient analysis. Time dependent stresses at critical speeds are used for fatigue strength evaluation as per Goodman diagram. The modified design is approx. 13.90% lighter and sustains 25.00 ton axle load in comparison of earlier 22.00 ton. Suggested topological changes have been compared by using frequencies of the initial and modified designs. Further, based on Indian railways running conditions, actual assessment and trial of the modified design bogie frame prototype has been carried out by Research Designs and Standards Organisation (RDSO) [2]. The results of the trial are found to be satisfactory and within the prescribed range.

Example of Internal Redundancy to Improve the Dynamics Performance of Parallel Manipulators

2012 ◽  
Author(s):  
Soheil S. Parsa ◽  
Juan A. Carretero ◽  
Roger Boudreau
Keyword(s):  
Dynamic Model ◽  
Dynamic Properties ◽  
Center Of Mass ◽  
Parallel Manipulators ◽  
Redundant Manipulators ◽  
Serial Manipulators ◽  
Numerical Example ◽  
Kinematic Singularities ◽  
First Time

In recent years, redundancy in parallel manipulators has been discussed for the cases of kinematic, actuation and branch redundancy. Some advantages of these redundant manipulators include the reduction or elimination of some types of kinematic singularities and/or an increase of their reachable and dexterous workspaces, to name a few. Internal redundancy, first introduced for serial manipulators, refers to the concept of adding movable masses to some links so as to allow to control the center of mass and other dynamic properties of some links. In this paper, the concept of internal redundancy is investigated for the first time in the context of parallel manipulators. More specifically, the 3-RRR planar manipulator, where a movable mass has been added to the distal link, is analysed. The manipulator’s dynamic model is briefly introduced and then is used to track a simple trajectory. A numerical example is shown to support the idea.

Sign in / Sign up

Export Citation Format

Share Document