scholarly journals Wind-Induced Vibration Response of an Inspection Vehicle for Main Cables Based on Computer Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Lu Zhang ◽  
Shaohua Wang ◽  
Peng Guo ◽  
Qunsheng Wang
Keyword(s):  
Finite Element ◽  
Wind Speed ◽  
Ride Comfort ◽  
Suspension Bridge ◽  
Vibration Response ◽  
Fe Model ◽  
Main Cable ◽  
Main Cables ◽  
Wind Induced Vibration ◽  
Wind Induced Vibration Response

This paper presents a simulation approach based on the finite element method (FEM) to analyze the wind-induced vibration response of an inspection vehicle for main cables. First, two finite element (FE) models of a suspension bridge and a main cable-inspection vehicle coupled system are established using MIDAS Civil software and ANSYS software, respectively. Second, the mean wind speed distribution characteristics at a bridge site are analyzed, and the wind field is simulated based on the spectral representation method (SRM). Third, a modal analysis and a wind-induced vibration response transient analysis of the suspension bridge FE model are completed. Fourth, the vibration characteristics of the inspection vehicle are analyzed by applying fluctuating wind conditions and main cable vibration displacements in the main cable-inspection vehicle coupled FE model. Finally, based on the ISO2631-1-1997 standard, a vehicle ride comfort evaluation is performed. The results of the suspension bridge FE modal analysis are in good accordance with those of the experimental modal test. The effects of the working height, number of nonworking compressing wheels, and number of nonworking driving wheels during driving are discussed. When the average wind speed is less than 13.3 m/s, the maximum total weighted root mean square acceleration (av) is 0.1646 m/s2 and the vehicle ride comfort level is classified as “not uncomfortable.” This approach provides a foundation for the design and application of inspection vehicles.

Study on Wind-Induced Vibration Response of Aerial Working Arm

2012 ◽  
Vol 510 ◽  
pp. 292-297
Author(s):  
Hong Qi Jiang ◽  
Xian Biao Mao ◽  
Shun Cai Li ◽  
Yu Liu
Keyword(s):  
Finite Element ◽  
Wind Speed ◽  
Random Vibration ◽  
Random Excitation ◽  
Vibration Response ◽  
Analysis Method ◽  
Complex Dynamic ◽  
Pseudo Excitation ◽  
Wind Induced Vibration ◽  
Wind Induced Vibration Response

Since boom-type aerial equipment has complex dynamic characteristic under the action of random wind loads, traditional methods are hard to reflect its dynamic response. We put forward an analysis method for wind-induced random vibration response of aerial working arms based on finite element and pseudo-excitation methods. In this analysis, the pulse-wind-load-induced vibration was regarded as a random vibration under multi-point coherent steady random excitation, and Davenport wind speed spectra invariant with height were adopted with consideration of multi-point wind excitation correlation. We analyzed the wind-induced random vibration of the working arm of a folding-arm-type aerial operation vehicle. The analysis results confirm the reliability of the analysis method, so as to offer a feasible way for analyzing the dynamic wind-induced vibration response of large boom-type aerial equipment.

scholarly journals A Novel Shape Finding Method for the Main Cable of Suspension Bridge Using Nonlinear Finite Element Approach

2021 ◽  
Vol 11 (10) ◽  
pp. 4644
Author(s):  
Weiliang Zhu ◽  
Yaojun Ge ◽  
Genshen Fang ◽  
Jinxin Cao
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Suspension Bridge ◽  
Nonlinear Finite Element ◽  
Finite Element Approach ◽  
Main Cable ◽  
Element Approach ◽  
Lagrangian Coordinate ◽  
Main Cables ◽  
Finding Method

The determination of the final cable shape under the self-weight of the suspension bridge enables its safe construction and operation. Most existing studies solve the cable shape segment-by-segment in the Lagrangian coordinate system. This paper develops a novel shape finding method for the main cable of suspension bridge using nonlinear finite element approach with Eulerian description. The governing differential equations for a three-dimensional spatial main cable is developed before a one-dimensional linear shape function is introduced to solve the cable shape utilizing the Newton iteration method. The proposed method can be readily reduced to solve the two-dimensional parallel cable shape. Two iteration layers are required for the proposed method. The shape finding process has no need for the information of the cable material or cross section using the present technique. The commonly used segmental catenary method is compared with the present method using three cases study, i.e., a 1666-m-main-span earth-anchored suspension bridge with 2D parallel and 3D spatial main cables as well as a 300-m-main-span self-anchored suspension bridge with 3D spatial main cables. Numerical studies and iteration results show that the proposed shape finding technique is sufficiently accurate and operationally convenient to achieve the target configuration of the main cable.

Simulation of Bus Ride Comfort under the Excitation of Road Irregularity

2012 ◽  
Vol 510 ◽  
pp. 249-254 ◽  
Author(s):  
Jin Feng ◽  
Yuan Hua Chen
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Ride Comfort ◽  
Temporal Frequency ◽  
Vertical Vibration ◽  
Fe Model ◽  
Analysis Method ◽  
The Road ◽  
Power Spectral ◽  
Bus Structure

Bus vibration is studied by the finite element method (FEM) base on bus structure model. The bus mathematical model of vertical vibration is established and the vibration response variables were deduced with the modal analysis method. The finite element (FE) model is established and decoupled. The transformational relation between spatial frequency displacement power spectral density (PSD) and temporal frequency displacement PSD and the sampling characteristics of the road irregularity PSD in numerical computation are discussed. Road irregularity load is modeled in software. The FE model is solved using modal analysis method and the acceleration PSD of each keypoint can be gained. Finally, a road test experiment is carried on to verify the simulation results. The example indicated that study on vehicle ride comford by FEM has instructive meaning.

Application of Exact Element-Method on Calculation of Form-Finding and Unstressed Length of Cable

2013 ◽  
Vol 405-408 ◽  
pp. 1699-1708
Author(s):  
Zhou Li ◽  
Yuan Cheng Wei ◽  
Rong Hui Wang ◽  
Jia Lun Li ◽  
Peng Zhang
Keyword(s):  
Finite Element ◽  
Solution Process ◽  
Suspension Bridge ◽  
Equilibrium Relation ◽  
Form Finding ◽  
Finite Element Software ◽  
Main Cable ◽  
Computational Procedures ◽  
Shape Curve ◽  
Element Method

The problem of form-finding for the suspended cable is actually the problem of determining all key points coordinates on main cable, which are by equilibrium relation on the horizontal force, main cable sagitta and lifting point force under the precondition of determining the endpoints boundary conditions of cable segment. According from the static equilibrium relationship of cable element, based on the analysis of its analytical solution process, in this paper, the cable elements are divided into two types in accordance withthe vertical distribution load along the arc length and along the string length , the corresponding shape curve of cable element is the parabola and the catenary, and with parabolic results as its initial value for the iteration of nonlinear solution, then cable element eventually converge for the catenary. And based on the exact coordinates results ,the calculation method of the length without stress is presented,and compiled corresponding computational procedures. By comparing the results of form-finding and the cable-length in non-stress according to program compiled and the results from the finite element software and the measured value of Aizhai suspension bridge, compared with the nonlinear finite element method,it confirmed the method requireing smaller dividing element density, the convergence speed is quicker and the results can ensure the precision.

scholarly journals Parametric Study on Responses of a Self-Anchored Suspension Bridge to Sudden Breakage of a Hanger

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Wenliang Qiu ◽  
Meng Jiang ◽  
Cailiang Huang
Keyword(s):  
Suspension Bridge ◽  
Element Model ◽  
Dynamic Responses ◽  
Flexural Stiffness ◽  
Static And Dynamic Analysis ◽  
Main Cable ◽  
Reaction Forces ◽  
Internal Forces ◽  
Torsion Stiffness ◽  
Main Cables

The girder of self-anchored suspension bridge is subjected to large compression force applied by main cables. So, serious damage of the girder due to breakage of hangers may cause the collapse of the whole bridge. With the time increasing, the hangers may break suddenly for their resistance capacities decrease due to corrosion. Using nonlinear static and dynamic analysis methods and adopting 3D finite element model, the responses of an actual self-anchored suspension bridge to sudden breakage of hangers are studied in this paper. The results show that the sudden breakage of a hanger causes violent vibration and large changes in internal forces of the bridge. In the process of the vibration, the maximum tension of hanger produced by breakage of a hanger exceeds 2.22 times its initial value, and the reaction forces of the bearings increase by more than 1.86 times the tension of the broken hanger. Based on the actual bridge, the influences of some factors including flexural stiffness of girder, torsion stiffness of girder, flexural stiffness of main cable, weight of girder, weight of main cable, span to sag ratio of main cable, distance of hangers, span length, and breakage time of hanger on the dynamic responses are studied in detail, and the influencing extent of the factors is presented.

A Iterative Computation Method for Main Cable Shape Calculation of Self-Anchored Suspension Bridge

2013 ◽  
Vol 477-478 ◽  
pp. 666-670
Author(s):  
Xu Ming Song
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculation ◽  
Suspension Bridge ◽  
Internal Force ◽  
Computation Method ◽  
The Real ◽  
Iterative Computation ◽  
Calculating Method ◽  
Main Cable

Both finite element method and cable numerical calculation have their limitations in calculation of main cable shape for self-anchored suspension bridge. This paper combined the characteristics of the two methods, and worked out the cable shape and internal force of self-anchored suspension bridge though iterative computation. Sanchaji Bridge, a self-anchored suspension bridge in Changsha city, its main cable shape was calculated by this method. Calculating results show that the real shape of main cable fit the results well and we should carefully calculate the length of girder compression which influences the unstressed length of main cable and the position of hangers. The calculating method adopted in Sanchaji Bridge offered a reference for design and construction for similar bridges.

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