Study on Dynamic Characteristics of High-speed Train Rolling Bearing with Pedestal Looseness

2016 ◽  
Vol 52 (21) ◽  
pp. 87
Author(s):  
Qingsong CAO
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Rolling Bearing ◽  
High Speed Train

The Double Pendulum Model and Nonlinear Dynamic Characteristics of the Pantograph of High-Speed Train

2013 ◽  
Vol 275-277 ◽  
pp. 767-770
Author(s):  
Hua Li ◽  
Shu Qian Cao
Keyword(s):  
Numerical Simulation ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Lagrange Equation ◽  
Variable Stiffness ◽  
Nonlinear Damping ◽  
Double Pendulum ◽  
High Speed Train ◽  
Pendulum Model ◽  
Damping Torque

In this paper, the double pendulum model of the pantograph was developed, in which a square angular velocity damping torque was used to describe the nonlinear damping torque of the hydraulic vibration damper, and the catenary was described as a variable stiffness spring. Considering the nonlinear factors caused by hydraulic damping and the interaction between the catenary and the pantograph, the motion differential equations based on the double pendulum model were established in Lagrange equation, and then were simplified. The dynamic characteristics were analyzed through numerical simulation. The result of numerical simulation shows that there are quasi-periodic motion and chaos in the system, which are both affected by the pendulum length ratio. The results are helpful to research the dynamic characteristics of the pantograph of high-speed train.

Influence of Pocket Wear on the Dynamic Characteristics of High-Speed Ball Bearing Cage

2019 ◽  
Author(s):  
Hui Li ◽  
Chen Li ◽  
Yuan Li ◽  
Shemiao Qi ◽  
Yi Liu ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Dynamic Characteristics ◽  
High Speed ◽  
Ball Bearing ◽  
Rolling Bearing ◽  
Outer Ring ◽  
Wear Loss ◽  
Vibration Modes ◽  
Mass Center ◽  
Fluctuation Amplitude

Abstract Aiming at the problem of wear on the cage-pocket during the operation of high speed rolling bearing, a dynamic model of high-speed ball bearing was established considering the wear loss of the ball-pocket, and the simulation was carried out to research on the interaction among the balls, the inner ring, the outer ring and the cage with different wear loss of the ball-pocket. The effect of the pocket wear on the trajectory of the cage’s mass center and the skidding ratio of cage was obtained. It was found out that the mass-center trajectory of the cage presents two vibration modes with different amplitudes which emerges alternatively. Moreover, the wear loss of the ball-pocket has little effect on the average skidding ratio of the cage, however, the fluctuation amplitude would become larger as the wear increase. This study can provide theoretical guidance for the design of bearing cage pocket size.

System Design of Spindle on High-Precise CNC

2012 ◽  
Vol 151 ◽  
pp. 463-468 ◽  
Author(s):  
Jun Feng Wang ◽  
Xian Feng Du ◽  
Qing Ming Hu ◽  
Shi Gang Wang
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Rapid Development ◽  
Rolling Bearing ◽  
Spindle Motor ◽  
Production Equipment ◽  
Direct Drive ◽  
Static And Dynamic Characteristics ◽  
Radial Bearing ◽  
Accuracy And Stability

With the rapid development of science and technology, Lathe will be sure to develop in the direction of high speed, high precision and high stability as the most basic and important production equipment in industry. The spindle is the one of important component in the lathe, of which static and dynamic characteristics is directly related to the machining precision and machining stability, and the performance of spindle system directly affects the overall machine specifications. Through the analysis of the characteristics of spindle, the ways and means of the spindle analysis are studied. For the requirements of static and dynamic characteristics analysis in the process of spindle design on high-precise CNC lathes hydrostatic, direct-drive spindle motor mode is used. Three-supporting structure is adapted in the layout of spindle bearing in order to improve the accuracy and stability of the spindle drive. The rolling bearing is used in auxiliary support, the front and rear radial bearing is used in master hydrostatic bearing. Thrust bearings are located on both sides of the former type of radial bearing to complete the selection of the spindle material and the design of the structural primary dimensions. It is meaningful to improve the specifications of CNC lathes, guide the design, generation and modification of the high precise CNC lathe and enhance static dynamic characteristics of the spindle and improve accuracy and stability of the machine tool processing.

scholarly journals Response of short span bridges under mooving high-speed train

2019 ◽  
Vol 2019 (11) ◽  
pp. 12-19
Author(s):  
Monika Podworna
Keyword(s):  
Dynamic Characteristics ◽  
High Speed ◽  
Steel Structure ◽  
Dynamic Responses ◽  
High Speed Train ◽  
Load Model ◽  
Load Models ◽  
Concentrated Forces ◽  
Concentrated Masses ◽  
Short Span

The paper presents a comparison of dynamic responses of bridges with different dynamic characteristics to a quasi-real mobile load. Different bridge – track – train (moving at high speed) systems were analyzed. The system is ballasted monotrack. The model of the bridge is a 15-meter beam simple-supported with a steel structure. The load model is represented by the Shinkansen train. The results are compared with very simplified load models, such as streams of concentrated forces, concentrated masses, one-mass oscillators and two-mass oscillators.

An Investigation on Dynamic Characteristics of a High Speed Rotor With Complex Structure for Microturbine Test Rig

2008 ◽  
Author(s):  
Di Zhang ◽  
Yonghui Xie ◽  
Zhenping Feng
Keyword(s):  
Temperature Field ◽  
Numerical Model ◽  
Dynamic Characteristics ◽  
Torsional Vibration ◽  
High Speed ◽  
Complex Structure ◽  
Rolling Bearing ◽  
Lateral Vibration ◽  
Test Rig ◽  
Turbine Impeller

During the research and development of 100kW class microturbine, a test rig with complex structure rotor for turbine impeller was constructed. Due to the limitation of test rig, the test rotor has to adopt cantilever configuration, which consists of shaft, connect disk with cool air holes, turbine impeller, and tie bar that joints the previous three components together. Because the rotor has a high rotational speed of 30000rpm, the ceramic rolling bearing is adopted for the test rig. In order to understand the dynamic characteristics of the rotor, a numerical model for temperature field has been developed using three dimensional finite element method firstly; then a numerical model to analyze the dynamic characteristics of high-speed ceramic rolling bearing and a numerical model to analyze the dynamic characteristics of the rotor considering the effect of temperature, shear deflection and gyroscopics have been developed too. At last, the temperature field and the dynamic characteristics of the test rig rotor were investigated in detail, some numerical results such as the critical speeds of lateral and torsional vibration, imbalance response, accelerate transient response were obtained. The numerical result of the first critical speed of lateral vibration shows good agreement with the experimental data, so the numerical model can provide accurate results for rotor dynamic analysis of such kind of rotor. Meanwhile, the critical speeds of lateral vibration and torsional vibration are far away from the operation speed of the rotor, and the response values are also very small, so that the rotor can operate reliably.

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