Vibration Analysis of a Rail Operating Vehicle

2013 ◽  
Vol 662 ◽  
pp. 591-594
Author(s):  
Wei Guo ◽  
Qian Ding
Keyword(s):  
Vibration Analysis ◽  
Reference Value ◽  
Dynamical Model ◽  
Dynamical Response ◽  
Euler Beam ◽  
Bogie Frame ◽  
Dynamic Design ◽  
Flexible Coupling ◽  
Car Body ◽  
Operating Vehicle

A simplified rigid-flexible coupling dynamical model of the rail operating vehicle, including bogie frame and car body, was built. The car body is modeled as a flexible uniform Euler beam. The dynamical response of the vehicle under the irregularity dynamic action between wheel and rail was numerically calculated and analyzed by the fast stability algorithms. Influences of the suspension on vibration and stability of the vehicle are analyzed. The results have a certain reference value on the dynamic design of multi-functional track operating vehicle.

CALCULATION-EXPERIMENTAL METHOD FOR DEFINITION OF LOWEST FREQUENCY IN BENDING VIBRATIONS OF COACH CAR BODY IN VERTICAL PLANE BASED ON IDENTIFICATION OF ITS BENDING STIFFNESS

2020 ◽  
Vol 2020 (9) ◽  
pp. 35-46
Author(s):  
Aleksandr Skachkov ◽  
Viktor Vasilevskiy ◽  
Aleksey Yuhnevskiy
Keyword(s):  
Least Squares Method ◽  
Vertical Plane ◽  
Bending Stiffness ◽  
Dimensional Problem ◽  
Euler Beam ◽  
Bending Vibrations ◽  
Car Body ◽  
Variable Function ◽  
Experimental Values ◽  
Definition Of

The consideration of existing methods for a modal analysis has shown a possibility for the lowest frequency definition of bending vibrations in a coach car body in a vertical plane based on an indirect method reduced to the assessment of the bending stiffness of the one-dimensional model as a Bernoulli-Euler beam with fragment-constant parameters. The assessment mentioned can be obtained by means of the comparison of model deflections (rated) and a prototype (measured experimentally upon a natural body) with the use of the least-squares method that results in the necessity of the solution of the multi-dimensional problem with the reverse coefficient. The introduction of the hypothesis on ratability of real bending stiffness of the prototype and easily calculated geometrical stiffness of a model reduces a multi-dimensional problem incorrect according to Adamar to the simplest search of the extremum of one variable function. The procedure offered for the indirect assessment of bending stiffness was checked through the solution of model problems. The values obtained are offered to use for the assessment of the lowest frequency of bending vibrations with the aid of Ritz and Grammel methods. In case of rigid poles it results in formulae for frequencies into which there are included directly the experimental values of deflections.

Dynamical Modeling of Gear Transmission Considering Gearbox Casing

2018 ◽  
Author(s):  
Yang Luo ◽  
Natalie Baddour ◽  
Ming Liang
Keyword(s):  
Dynamic Models ◽  
Signal Propagation ◽  
Gear Transmission ◽  
Gear System ◽  
Dynamical Model ◽  
Contact Friction ◽  
Dynamical Response ◽  
Dynamic Simulations ◽  
Friction Forces ◽  
Frequency Domains

Much research has been carried out to investigate the dynamical response of a gear system because of its importance on vibration feature analysis. It is well known that the gearbox casing is one of the most important components of the gear system and plays an important role in signal propagation. However, its effects have widely been neglected within the dynamic simulations and few dynamic models have considered the gearbox casing when modeling a gear transmission. This paper proposes a gear transmission dynamical model with the consideration of the effects of gearbox casing. The proposed dynamical model incorporates TVMS, a time-varying load sharing ratio, as well as dynamic tooth contact friction forces, friction moments and dynamic mesh damping coefficients. The proposed gear dynamical model is validated by comparison with responses obtained from experimental test rigs under different speed conditions. Comparisons indicate that the responses of the proposed dynamical model are consistent with experimental results, in both time and frequency domains under different rotation speeds.

scholarly journals Vibration Analysis of Rotor - Coupling - Bearing System With Misaligned Shafts

1996 ◽  
Author(s):  
A. Sreenivasa Rao ◽  
A. S. Sekhar
Keyword(s):  
Theoretical Model ◽  
Finite Elements ◽  
Vibration Analysis ◽  
Rotating Machinery ◽  
Value Analysis ◽  
Flexible Coupling ◽  
Eigen Value ◽  
Shaft Misalignment ◽  
Reaction Forces ◽  
Bearing System

The shaft misalignment, even being a common fault in rotating machinery, is not sufficiently studied. The present work addresses effects of misalignment in rotating machinery. An attempt to give a theoretical model for a rotor-coupling-bearing system has been done. The rotor-bearing system including the flexible coupling is modelled using the finite elements. The reaction forces and moments developed due to flexible coupling misalignment both for parallel and angular are derived and introduced in the model. Vibration analyses such as eigen value analysis and unbalance response are carried out for the rotor system with misaligned shafts.

A Simple Vibration Analysis for Running Boards and Other Attached Components

2004 ◽  
Author(s):  
Shaun Richmond
Keyword(s):  
Vibration Analysis ◽  
Spring Model ◽  
Analysis Method ◽  
Simple Analysis ◽  
Car Body ◽  
Mass Spring Model ◽  
Frequency Components ◽  
Simple Mass ◽  
Wheel Flat ◽  
Mass Spring

Vibration of attached components such as running boards, hand grabs, brake components, etc. has become a serious problem. This paper sets out a simple analysis method for ensuring the survival of these components. A simple mass spring model is used to develop a transfer function into the car body. The frequency components of a wheel flat and 39/33 foot jointed track are then established and the excitation amplitudes for components attached to the car body calculated. The response of these components at their natural frequency is then used to calculate their resulting stress levels. Simple methods for performing this analysis are described

Study on Geometry Filtering Phenomenon and Flexible Car Body Resonant Vibration of Articulated Trains

2013 ◽  
Vol 787 ◽  
pp. 542-547 ◽  
Author(s):  
Dao Gong ◽  
Yue Jia Gu ◽  
Jin Song Zhou
Keyword(s):  
Low Frequency ◽  
Ride Quality ◽  
Green Functions ◽  
Resonant Vibration ◽  
Flexible Coupling ◽  
Car Body ◽  
Articulated Vehicles ◽  
Coupling Dynamic ◽  
Track Irregularity ◽  
Coupling Dynamic Model

A vertical rigid-flexible coupling dynamic model of three articulated vehicles with car body flexibility is established, Green functions are utilized to solve the partial differential equation of each car body, and the mechanism of car body flexible resonance is analyzed. Results show that geometry filtering phenomenon exists in articulated train, when the car body first vertical bending frequency coincides with the frequencies which have the peak values of car body bounce acceleration transmissibility, resonant vibration of flexible car body will happen; The energy of track irregularity decreases rapidly with the increasing frequency, so it is important to avoid the car body resonance at low frequency; If the first vertical bending frequency of car body is greater than a certain value, the flexible resonance will have little effect on the ride quality.

Vibration Modal Analysis of Involve Gear with Asymmetric Tooth Profile and Double Pressure Angles

2011 ◽  
Vol 418-420 ◽  
pp. 1748-1751
Author(s):  
Wei Li ◽  
Ning Liu ◽  
Ning Li ◽  
Yan Jun Liu ◽  
Liang Ma
Keyword(s):  
Modal Analysis ◽  
3D Model ◽  
Natural Frequencies ◽  
Reference Value ◽  
Tooth Profile ◽  
Mode Shapes ◽  
Ansys Software ◽  
Dynamic Design ◽  
Dynamic Performances ◽  
Vibration Modal

The 3D model of gear with asymmetric profile and double pressure angles is built by the autodesk inventor software. It is imported and analyzed by the ANSYS software. Then each order natural frequencies and mode shapes are obtained. So resonance and harmful mode shapes can be avoided, and dynamic performances of gear with asymmetric profile and double pressure angles is improved. This paper has a certain reference value for the dynamic design of other types of gears.

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