Hybrid Probabilistic and Non-Probabilistic Dynamic Analysis of Vehicle-Bridge Interaction System with Uncertainties

2014 ◽  
Vol 553 ◽  
pp. 545-550
Author(s):  
Neng Guang Liu ◽  
Wei Gao ◽  
Chong Ming Song ◽  
Nong Zhang
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Random Variables ◽  
Element Model ◽  
Simulation Method ◽  
Mean Value ◽  
Element Analysis ◽  
Moving Vehicle ◽  
Interaction System ◽  
Interval Variables

A hybrid probabilistic interval dynamic analysis of vehicle-bridge interaction system with a mixture of random and interval properties is studied based on finite element analysis framework. A half car model is used to represent a moving vehicle and the bridge is modeled as a simply supported Euler-Bernoulli beam. The vehicle’s parameters are considered as interval variables and the bridge’s parameters are treated as random variables. The mathematical model of vehicle-bridge interaction system is established based on the finite element model. By introducing the random interval perturbation method into the dynamic analysis of vehicle-bride interaction system, the expressions for the mean value and variance of the bridge dynamic response are developed. Examples are used to illustrate the effectiveness of the presented method. The accuracy and effectiveness of the numerical results are verified by a hybrid simulation method combining direct simulations for interval variables and Monte-Carlo simulations for random variables.

Hybrid probabilistic interval dynamic analysis of vehicle–bridge interaction system with uncertainties

2014 ◽  
Vol 14 (03) ◽  
pp. 1350069 ◽  
Author(s):  
N. Liu ◽  
W. Gao ◽  
C. Song ◽  
N. Zhang
Keyword(s):  
Dynamic Analysis ◽  
Random Variables ◽  
Simulation Method ◽  
Mean Value ◽  
Random Interval ◽  
Moving Vehicle ◽  
Interaction System ◽  
Individual System ◽  
Interval Variables ◽  
Interval Width

This paper presents the hybrid probabilistic interval dynamic analysis of vehicle–bridge interaction system with a mixture of random and interval properties. The vehicle's parameters are considered as interval variables and the bridge's parameters are treated as random variables. A half car model is used to represent a moving vehicle and the bridge is modeled as a simply supported Euler–Bernoulli beam. By introducing the random interval moment method (RIMM) into the dynamic analysis of vehicle–bride interaction system, the expressions for the mean value and standard deviation of the random interval bridge dynamic response are developed. The midpoint and interval width of the first two statistical moments are then determined. Examples are used to illustrate the effectiveness of the presented method. A hybrid simulation method combining direct simulations for interval variables and Monte Carlo simulations for random variables is implemented to validate the computational results. The effects of individual system parameters on bridge response are also investigated.

Investigation of Broken Cut Spikes on Elastic Fastener Tie Plates Using an Integrated Simulation Method

2018 ◽  
Author(s):  
Yin Gao ◽  
Mike McHenry ◽  
Brad Kerchof
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Simulation Method ◽  
Operating Conditions ◽  
Analysis Model ◽  
Element Analysis ◽  
Integrated Simulation ◽  
Multibody Model ◽  
Track System ◽  
High Degree

Cut spike fasteners, used with conventional AREMA rolled tie plates and solid sawn timber ties, are the most common tie and fastener system used on North American freight railroads. Cut spikes are also used to restrain tie plates that incorporate an elastic rail fastener — that is, an elastic clip that fastens the rail to the tie plate. Elastic fasteners have been shown to reduce gage widening and decrease the potential for rail roll compared to cut spike-only systems. For this reason, elastic fastener systems have been installed in high degree curves on many railroads. Recent observations on one Class I railroad have noted broken cut spikes when used with these types of tie plates in mountainous, high degree curve territory. Broken screw spikes and drive spikes on similar style plates have also been observed. In this paper, a simulation method that integrates a vehicle-track system dynamics model, NUCARS®, with a finite element analysis model is used to investigate the root causes of the broken spikes. The NUCARS model consists of a detailed multibody train, wheel-rail contact parameters, and track model that can estimate the dynamic loading environment of the fastening system. For operating conditions in tangent and curve track, this loading environment is then replicated in a finite element model of the track structure — ties, tie plates, and cut spikes. The stress contours of the cut spikes generated in these simulations are compared to how cut spikes have failed in revenue service. The tuning and characterization of both the vehicle dynamics multibody model and the finite element models are presented. Additionally, the application of this approach to other types of fastening systems and spike types is discussed. Preliminary results have identified a mechanism involving the dynamic unloading of the tie plate-to-tie interface due to rail uplift ahead of the wheel and the resulting transfer of net longitudinal and lateral forces into the cut spikes. Continued analysis will attempt to confirm this mechanism and will focus on the severity of these stresses, the effect of increased grade, longitudinal train dynamics, braking forces, and curvature.

Identification of Bolt Connection Parameters for Vertical Grinding Machine in CAD/CAE Environment

2011 ◽  
Vol 697-698 ◽  
pp. 97-101
Author(s):  
Chao Hao Wang ◽  
Yong Liang Chen ◽  
Jin Ping Pang ◽  
Da Wei Zhang ◽  
G.X. Pan
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Element Model ◽  
Joint Surface ◽  
Element Analysis ◽  
Modal Test ◽  
Integrated Environment ◽  
Grinding Machine ◽  
Bolt Connection ◽  
The Mathematical Model

Dynamic analysis and modal test were conducted on a vertical grinding machine. The mathematical model of joint surface parameter identification between the bed and the column was established in CAD/CAE integrated environment. Based on the results of dynamic analysis and modal test, the parameters of joint surface were identified and the finite element model was accurately created. Then, the weak bodies of the original machine were improved. According to the finite element analysis of the improved machine, the performances of the new machine were better than the original machine.

Transient Dynamic Analysis of Maglev Linear Feed Unit

2011 ◽  
Vol 317-319 ◽  
pp. 405-409
Author(s):  
An Dong Jiang ◽  
Jiang Jin ◽  
Su Yang Ma ◽  
Zheng Peng Xia ◽  
Ping Liao
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Magnetic Levitation ◽  
Element Model ◽  
Design Stage ◽  
Transient Dynamic Analysis ◽  
Element Analysis ◽  
Forecast Performance ◽  
Transient Dynamic ◽  
Feed Unit

Abstract. The magnetic levitation linear feed unit is a new type of machine features. In machining, the tool and workpiece interaction force will be delivered to the table and make the deformation, resulting in processing errors of machine tools, machining of precision and surface quality. In this paper we established three-dimensional finite element model of the table of feed unit, use the finite element analysis software ANSYS to analysis of the transient dynamic analysis of the pre-designed table and improve the structure of the table at the design stage and forecast performance of the table and provide a theoretical basis for structure optimization.

Comparison of frequency- and time-domain analyses for guyed masts in turbulent winds

2006 ◽  
Vol 33 (2) ◽  
pp. 169-182 ◽  
Author(s):  
B F Sparling ◽  
L D Wegner
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Dynamic Analysis ◽  
Frequency Domain ◽  
Time Domain ◽  
Element Model ◽  
Mode Shapes ◽  
Nonlinear Behaviour ◽  
Element Analysis ◽  
Guyed Mast

Both frequency- and time-domain methods have been employed in the dynamic analysis of guyed telecommunication masts subjected to turbulent winds. Although the probabilistic frequency-domain approach offers some advantages in terms of its relative ease of implementation and in the statistical reliability of wind load descriptions, the deterministic time-domain method permits a more realistic treatment of system nonlinearities. In this study, a numerical investigation was undertaken to compare frequency- and time-domain dynamic response predictions for a selected guyed mast in gusty winds. Two different analysis techniques were employed, with the frequency-domain calculations performed using response influence lines and the time-domain analyses carried out using a stiffness-based finite element model. Good agreement was observed in root-mean-square and peak dynamic response estimates after compensation was included for differences in turbulence intensity levels assumed in the two models. In general, natural frequencies and mode shapes were also similar.Key words: guyed mast, dynamic analysis, wind, turbulence, nonlinear behaviour, finite element analysis, cables, frequency domain, time domain.

Numerical Analysis on Adjacent Highrise and Multistoried Buildings-Pile-Soil Dynamic Interaction

2012 ◽  
Vol 446-449 ◽  
pp. 2299-2304 ◽  
Author(s):  
Pei Zhen Li ◽  
Peng Xu ◽  
Zhao Hui Pan ◽  
Xi Lin Lu
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Element Model ◽  
Dynamic Interaction ◽  
Soil Parameters ◽  
Analysis Program ◽  
Element Analysis ◽  
Interaction System ◽  
Single Structure ◽  
Soil Dynamic

In this paper, the general finite element analysis program ANSYS is adopted to analyze the 3D finite element model of adjacent highrise and multistoried buildings-pile-soil dynamic interaction system. In the model, the soil parameters are based on the characteristics of Shanghai soft soil, and the adjacent upper structures are two frame structures, which had 12 stories and 5 stories respectively. Through comparing the simulation results of this particular dynamic cross interaction system with those of single structure and two identical structures, some useful conclusions were obtained.

Initial Imperfection Models for Segments of Line Pipe

2005 ◽  
Vol 128 (4) ◽  
pp. 322-329 ◽  
Author(s):  
Alfred B. Dorey ◽  
David W. Murray ◽  
J. J. Roger Cheng
Keyword(s):  
Finite Element ◽  
Initial Imperfection ◽  
Bending Moment ◽  
Element Model ◽  
Mean Value ◽  
Analytical Models ◽  
Element Analysis ◽  
Line Pipe ◽  
Initial Imperfections ◽  
Experimental Behavior

Initial imperfections have long been acknowledged as having an effect on the behavior of shell structures, affecting both the global and local behavior. Yet, despite their significance, initial imperfections are rarely included in analytical models for pipelines. This is usually because of the complicated nature of initial imperfections, the difficulty in measuring them, and the small amount of available literature that describes their geometry. Some recent investigations at the University of Alberta in Edmonton have focused on the effect of initial imperfections on the behavior of segments of line pipe. Imperfections measured across the inside surface of pipe test specimens were incorporated into a finite element model that was developed to predict the experimental behavior of the specimens tested under combined loads of internal pressure, axial load and bending moment. Test-to-predicted ratios for the load carrying capacity of the test specimens had a mean value of 1.035 with a coefficient of variation of 0.047. The improvements in the accuracy of the finite element analysis models that include the initial imperfection pattern indicate their importance in modeling the experimental behavior. Once the importance of initial imperfections was established, idealized patterns were developed to simplify numerical modeling. This paper presents the results of different patterns investigated for both plain and girth-welded segments of line pipe and provides recommended simplified assumed initial imperfection patterns.

Strength Evaluation of Polymer Composite Spur Gear by Finite Element Analysis

2008 ◽  
Author(s):  
Mohammad Robiul Hossan ◽  
Zhong Hu
Keyword(s):  
Finite Element ◽  
Polymer Composite ◽  
Volume Fraction ◽  
Gear Tooth ◽  
Axial Stress ◽  
High Stress ◽  
Element Model ◽  
Simulation Method ◽  
Spur Gear ◽  
Element Analysis

Modern advanced polymer composite materials have opened a new level of noiseless, lubricant free, high resilience and precision gearing in power and motion transmission. The proper understanding and evaluation of gear strength and performance is an important prerequisite for any reliable application. In this paper, a 20% short glass fiber reinforced nylon66 spur gear fabricated by injection molding has been carefully investigated. A three-dimensional finite element model was used to simulate the multi-axial stress-strain behaviors of a gear tooth under the dynamic load for a complete working cycle with a special geometry, operating condition, fiber orientation and volume fraction. The strength of composite gears has been compared with isotropic un-reinforced nylon66 and steel gears. The tooth root region of a gear which usually experiences high stress and potential to failure has been carefully investigated. This computer simulation method can be used as a useful tool for evaluating strength and predicting failure of the polymer composite gears.

Finite Element Analysis of Bridge-Vehicle System with Randomness

2013 ◽  
Vol 479-480 ◽  
pp. 254-258
Author(s):  
Tai Ping Chang
Keyword(s):  
Finite Element ◽  
Mass Density ◽  
Element Model ◽  
Mean Value ◽  
Moving Loads ◽  
Element Analysis ◽  
Vehicle System ◽  
Statistical Dynamic ◽  
The Mathematical Model ◽  
Interaction Problem

This paper investigates the statistical dynamic behavior on the bridge-vehicle interaction problem with randomness in material properties and moving loads. The bridge is modeled as a beam with Gaussian random elastic modulus and mass density of material with random moving forces on top. The mathematical model of the bridge-vehicle system is established based on the finite element model in which the Gaussian random processes are represented by the Karhunen-Loéve expansion. Some statistical response such as the mean value and standard deviation of the deflections of the beam are obtained and checked by Monte Carlo simulation.

scholarly journals Dynamic Analysis of Gear and Rack Transmission System

2014 ◽  
Vol 8 (1) ◽  
pp. 662-667
Author(s):  
Xiao Yanjun ◽  
He Lihu ◽  
Zhu Jiayu ◽  
Xiao Yanchun
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Bending Strength ◽  
Natural Frequencies ◽  
Equivalent Stress ◽  
Element Model ◽  
Transmission System ◽  
Transient Dynamic Analysis ◽  
Element Analysis ◽  
Transient Dynamic

This paper firstly established a three-dimensional modal of gear and rack transmission system. By using finite element analysis software the model is analyzed and the first six natural frequencies of the gear and rack transmission system are acquired. According to the natural frequencies, actual working speed can be adjusted to avoid resonance. In light of the modal analysis, the transient dynamic finite element model of the gear and rack transmission system is established for the transient dynamic analysis. According to the equivalent stress contour of the gear and rack in contact progress at various times and based on transient dynamic analysis, contact strength and bending strength of the gear are verified and the maximum equivalent stress position is found, providing a theoretical basis for the optimization of the gear and rack.

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