scholarly journals Dynamic Analysis of Lumped Parameter Bridge Model Subjected to Earthquake Considering Soil Deformation

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Le Huu Dat ◽  
Bui Phuong Anh
Keyword(s):  
Dynamic Analysis ◽  
Soil Deformation ◽  
Bridge Model ◽  
Lumped Parameter

Dynamic Analysis of the Crank Train in a Single Cylinder Diesel Engine Using a Lumped Parameter Method

2016 ◽  
Author(s):  
X. Y. Zhang ◽  
J. Guo ◽  
Zhang Wenping
Keyword(s):  
Diesel Engine ◽  
Dynamic Analysis ◽  
Internal Force ◽  
Parameter Method ◽  
Cylinder Pressure ◽  
Connecting Rod ◽  
Single Cylinder ◽  
Rotating Speed ◽  
Lumped Parameter ◽  
Lumped Parameter Method

The kinematic and dynamic behaviors of the crank train in a single cylinder diesel engine are analyzed in the paper. The crank train mechanism consists of four parts: a crank without counterweight, a connecting rod, a piston associated with a cylinder and two stops at both ends of a stroke. The dynamic model is developed using a lumped parameter method. The inertia of mass or moment are considered by an equivalent treatment in the centers of the piston pin, the crank pin, the main journal, respectively. The longitudinal deformations of the connecting rod are simulated by spring-damping elements, as well as the angular and bending deformations of the crank. As a result, it was possible to predict the effects of the component inertia of mass or moment and stiffness on the internal force and rotating speed of the crank under the cylinder pressure.

scholarly journals Grillage Modeling Approach Applied to Simple-span Slab-girder Skewed Bridges for Dynamic Analysis

2018 ◽  
Vol 2 (3) ◽  
pp. 53-65
Author(s):  
Miriam Guadalupe López Chávez ◽  
António Arêde ◽  
José Manuel Jara Guerrero ◽  
Pedro Delgado ◽  
Humberto Varum
Keyword(s):  
Dynamic Analysis ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Modeling Technique ◽  
Computational Time ◽  
Vibration Modes ◽  
Skew Angle ◽  
Skewed Bridges ◽  
Good Ability ◽  
Bridge Model

This study involves the applicability of a simplified modeling technique to simple-span slab-girder skewed bridges for dynamic analysis, based on grillage modeling strategies. To evaluate the applicability of this technique, skew angles ranging from 0° to 60° are studied. The ability to capture vibration modes of grillage models is compared with three-dimensional (3-D) finite element (FE) models, using shell and frame elements. The effect of the skew angle in the grillage modeling technique of the bridge's deck and the grillage model accuracy associated with the orientation of the transverse grillage members (TGMs) are studied. The grillage modeling technique eliminates shell elements to model the slab, reducing the number of degrees of freedom and the computational time in the bridge model, but, although its simplicity, demonstrates good ability to capture the vibration modes.

A Meta-Modeling Procedure for Updating the Finite Element Model of an Arch Bridge Model

2013 ◽  
Vol 540 ◽  
pp. 79-86
Author(s):  
De Jun Wang ◽  
Yang Liu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Analysis ◽  
Large Scale ◽  
Model Updating ◽  
Element Model ◽  
Fe Model ◽  
Large Scale Structures ◽  
Bridge Model ◽  
Scale Structures

Finite element (FE) model updating of structures using vibration test data has received considerable attentions in recent years due to its crucial role in fields ranging from establishing a reality-consistent structural model for dynamic analysis and control, to providing baseline model for damage identification in structural health monitoring. Model updating is to correct the analytical finite element model using test data to produce a refined one that better predict the dynamic behavior of structure. However, for real complex structures, conventional updating methods is difficult to be utilized to update the FE model of structures due to the heavy computational burden for the dynamic analysis. Meta-model is an effective surrogate model for dynamic analysis of large-scale structures. An updating method based on the combination between meta-model and component mode synthesis (CMS) is proposed to improve the efficiency of model updating of large-scale structures. The effectiveness of the proposed method is then validated by updating a scaled suspender arch bridge model using the simulated data.

Non-linear Dynamic Analysis on a Continuum Suspension Bridge Model with Spatial Layout of Main Cables

2021 ◽  
Author(s):  
Liang Xu ◽  
Yi Hui ◽  
Ke Li
Keyword(s):  
Time Series ◽  
Dynamic Analysis ◽  
Primary Resonance ◽  
System Response ◽  
Fe Model ◽  
Linear Dynamic ◽  
Modal Properties ◽  
Bridge Model ◽  
Proposed Model ◽  
Non Linear

This study proposes an approach to set up a continuum full bridge model with spatially inclined cables based on the Hamilton principle. The dynamic governing functions, considering the geometric non-linearities of cables and deck, represent simultaneously the vertical motion of deck and vertical–horizontal motion of cable. With the comparison of the modal properties obtained from the model to those from the accurate model, results show that the proposed model is capable of accurately simulating the modal properties. The primary resonance responses and corresponding frequency-response curves are obtained through the multiple-scale-method. A finite element (FE) model is established, and the corresponding non-linear dynamic analysis in time domain is conducted. Comparing the results from two models, it can be checked that the proposed model is reliable. According to the results of the proposed model, it is found that the second-order shape functions (SOSFs) play a significant role in the system response. Once the non-linear vibration of the bridge becomes significant only considering the excited mode with using the classical Galerkin decomposition cannot correctly predict the structure response. The SOSFs can be classified into stationary and vibrating components. The vibrating component can deviate the time-series of response from the harmonic wave, and the stationary component directly determines the mean value of the time-series.

scholarly journals The influence of deck flexibility on the dynamic response of road bridges

2017 ◽  
Vol 10 (3) ◽  
pp. 706-743
Author(s):  
E. P. SCHMIDT ◽  
C. E. N. MAZZILLI
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Structural Model ◽  
Dynamic Models ◽  
Centre Of Mass ◽  
Box Girder ◽  
Interaction Forces ◽  
Curved Bridge ◽  
Bridge Model ◽  
Support Excitation

ABSTRACT A simplified methodology is proposed for the dynamic analysis of curved road bridges under the effect of a 3C class heavy vehicle. The dynamic models of both vehicle and bridge are considered to be uncoupled, being bound by the interaction forces. These forces come from the vehicle dynamic analysis, initially under rigid deck, subjected to a support excitation caused by the pavement geometric irregularities. Such forces are statically condensed in the vehicle centre of mass and applied to a simplified structural model (‘unifilar’) of a curved bridge with box girder section, considering the bridge super elevation. The influence of the rigid deck hypothesis on the dynamic response is assessed by an iterative procedure, in which the deck displacements are added to the pavement irregularities, to obtain an “equivalent irregularity” function. The new interaction forces are re-applied to the bridge model to determine new displacements, repeating the procedure until the results converge.

Dynamic Analysis of Long-Travel, High-Efficiency Shock Absorbers in Freight Cars

1970 ◽  
Vol 92 (3) ◽  
pp. 581-588
Author(s):  
F. Freudenstein
Keyword(s):  
Dynamic Analysis ◽  
High Efficiency ◽  
Sliding Friction ◽  
Classical Mechanics ◽  
Parameter Analysis ◽  
Design Parameters ◽  
Shock Absorbers ◽  
Closure Time ◽  
Lumped Parameter ◽  
Principal Design

A dynamic analysis is presented relating the principal design parameters of a constant force type, dissipative shock absorber to the forces experienced by a resilient lading. The analysis, which correlates the effects of coupler force, lading force, cushion travel, closure time, impact speed, and friction, represents an application of classical mechanics to a dynamical system with sliding friction (Coulomb damping). Although a lumped-parameter analysis forms the basis of the derivation, a procedure is described which takes into account the mass- and compliance distribution within the lading.

Dynamic Analysis of Combined Gear Drive

2011 ◽  
Vol 86 ◽  
pp. 256-259
Author(s):  
Ying Wang ◽  
Hai Xia Liu ◽  
San Min Wang
Keyword(s):  
Dynamic Analysis ◽  
Degrees Of Freedom ◽  
Time History ◽  
Forced Response ◽  
Parameter Method ◽  
Nonlinear Dynamic Model ◽  
Gear Drive ◽  
Lumped Parameter ◽  
Drive Systems ◽  
Fourier Transform Spectra

Combined gear drive is a common transmission form for high power drive systems. In order to study its behaviors of redundant drive, which improve the system reliability but lead to a problem of inter-excitation of vibrations, dynamic analysis becomes very necessary. First, considering the influences of gear meshing errors, backlashes and time-varying meshing stiffness, a nonlinear dynamic model of sixteen degrees of freedom is developed by using lumped parameter method. Then a nonlinear differential equation set is derived for calculating the steady-state forced response to the internal sinusoidal excitation. After that, time history wave of displacement responses, phase graphs, Poincaré maps and FFT (Fast Fourier Transform) spectra are analyzed. Finally, some useful conclusions are obtained.

Development of a Lumped-Parameter Model for the Dynamic Analysis of Valve Train Systems

2004 ◽  
Author(s):  
Francesco Frendo ◽  
Emilio Vitale ◽  
Luca Carmignani ◽  
David Gagliardi ◽  
Luigi Matteucci
Keyword(s):  
Dynamic Analysis ◽  
Valve Train ◽  
Lumped Parameter Model ◽  
Lumped Parameter
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