Impact Analysis of the Flexural Rigidity on the Frequency and Tension of the Stay Cable

2013 ◽  
Vol 540 ◽  
pp. 153-163
Author(s):  
Yong Ming Sun ◽  
Hang Sun
Keyword(s):  
Finite Element ◽  
Impact Analysis ◽  
Flexural Rigidity ◽  
Force Measurement ◽  
Element Model ◽  
Stay Cable ◽  
Frequency Method ◽  
Actual Measurement ◽  
Cable Force ◽  
Balance Curve

Research and practice show that frequency method is still the most practical and accurate method among all kinds of cable force measurements. Based on the classical string vibration theory, the finite element model of stay cable was created, and a method of iteratively computing stay cable balance curve considering with flexural rigidity was proposed. How dose the flexural rigidity affects the balance curve of stay cable was discussed, and the changing curves of the distance-to-sagging ratio following the pull-to-bend ratio were plotted, which indicated the bigger flexural rigidity, the smaller sagging. 25 pairs cable modality of Xichang cable stayed bridge were accurately analyzed, mode crossover was testified by finite element method, changing curves of frequency and mode shape following the cable force were separately plotted, and changing rule was induced, practical cable force computing method was given. Frequency difference is suitable to judge the rank of actual measurement frequency, and the second frequency is recommended to compute cable force. Engineering instance analysis testified, the method of practical cable force measurement could rule out errors by mode crossover, and be applied to cable with any lengths and any force.

Study on Cable Forces in Cable-Stayed Bridges Based on Forward Simulation Method

2014 ◽  
Vol 1020 ◽  
pp. 130-136
Author(s):  
Chuan Tian ◽  
Jun Dong ◽  
Tian Liang
Keyword(s):  
Finite Element ◽  
Calculation Method ◽  
Element Model ◽  
Simulation Method ◽  
Tension Force ◽  
Frequency Method ◽  
Cable Tension ◽  
Finite Element Software ◽  
Cable Force ◽  
Forward Calculation

According to cable tension calculation of cable-stayed bridge on construction, and combining with the example of Xinzao Pearl River Grand Bridge, this work proposes forward-calculation method to analyze cable tension force on construction and establishes geometric calculation simulation model to compare measured cable tension with theoretical cable tension. This paper introduces some kinds of methods calculating cable tension force on construction. It importantly discusses the principle and method of forward-calculation and the practical application in the actual project. Spacial finite element model is established for analysis based on finite element software MIDAS and the application of forward-analysis iterative method is considered to analyze the cable tension on construction , then the method of determining cable force on construction is explored. Finally the result shows that the cable tension based on forward-calculation method is usually accurate, the measured value is approximately equal to the theoretical value and the error is in the extent permitted. The correctness and reliability of the frequency method is effectively confirmed and the cable tension calculation of the similar bridge on construction is compatibly applied.

scholarly journals Evaluation of Cable Force Changes Effects on Cable Stayed Bridge

2020 ◽  
Vol 6 (11) ◽  
pp. 2159-2174
Author(s):  
Theint Theint Thu Soe ◽  
San Yu Khaing
Keyword(s):  
Finite Element ◽  
Force Measurement ◽  
Research Work ◽  
Tension Stress ◽  
Percentage Increase ◽  
Stay Cable ◽  
The Real ◽  
Finite Element Software ◽  
Cable Stayed Bridge ◽  
Cable Force

The proposed bridge, which is cable stayed bridge crosses the Hlaing River that flows through Western Yangon. It was completed in 2000 and is currently used to connect Insein Township with Hlaing Tharyar Township. It has the 20 years’ service life. It requires the inspection and the evaluation of the real condition of the structure. As cable element plays an important role in cable structures, evaluation of the real state of the stay cable is one of the main focuses of the cable stayed bridge. Firstly, in the research work all cables are inspected to evaluate the current condition of the cables with included visual inspection and vibration-based cable force measurement method. With the help of static and moving load analysis, the effect of force change cables in which the successive force changes are considered, and the possible cable loss effect on the structural behavior of the bridge are also investigated. The finite element model of the cable stayed bridge is developed based on the geometric shape and material properties from MOC and is modelled with finite element software MIDAS Civil. The tension forces obtained by inspection over years (2000 to 2018) using vibration-based measurements method are compared with the measured intact cable forces. According to the results of the data analysis, it is observed that the cables force variations of the seven cables are abnormal conditions. In order to evaluate the condition of a bridge effected by cable force variation, the two parameters are considered; percentage increase in tension stress of all cables and percentage increase in deflection of the deck. The present study describes the structural response of the bridge in order to evaluate the actual safety of the bridge with abnormal force change cables, and also examines the consequences of one cable failure. Doi: 10.28991/cej-2020-03091609 Full Text: PDF

Impact Analysis of an Oxygen Mask Locking Panel of Aircraft Using Finite Element Modelling

2014 ◽  
Vol 657 ◽  
pp. 735-739 ◽  
Author(s):  
Emilian Ionut Croitoru ◽  
Gheorghe Oancea
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Impact Analysis ◽  
Element Model ◽  
Composite Panel ◽  
Cad Model ◽  
Stress Variation ◽  
Element Modelling ◽  
Oxygen Mask ◽  
The Impact

This paper presents a method of finite element modelling used for the impact analysis of a composite panel. In this research, the composite panel consists of an oxygen mask locking panel of an aircraft. This panel is loaded with one concentrated abuse loading and three uniform distributed abuse loading cases and the stress variation within the composite panel for each load case is determined. In order to assess the impact analysis on the oxygen mask panel of the aircraft, a finite element model is created using Patran as the main application for pre/post-processing and Nastran as the main processor. The paper also presents a comparison between results obtained using the same finite element modelling of the composite panel CAD model of the panel with four load cases with different material types. The results are used to determine the most capable material stresswise.

The Research on Cable Force Measurement Based on Degenerated Element with Frequency Method

2013 ◽  
Vol 405-408 ◽  
pp. 1709-1715
Author(s):  
Xin Cui ◽  
Yong Jiang ◽  
Li Wen Fu ◽  
Jin Feng Wang
Keyword(s):  
Numerical Method ◽  
Theoretical Basis ◽  
Force Measurement ◽  
Beam Element ◽  
Testing System ◽  
Frequency Method ◽  
Operation Procedure ◽  
Cable Force ◽  
Cable Force Measurement ◽  
The Given

At present, among the methods of cable force measurement, the frequency method is applied extensively for its mature theory and rapid and repeated operation procedure. Based on the theory of frequency method measurement, it generally uses the numerical method with beam element to analysis the parameters of cables under the given conditions. However, the conventional beam element is not able to simulate the bending stiffness in beams section. Therefore, it turns to degenerated beam element to simulate cables and the results agree well with the results based on beam element and formulas calculation, and it provides theoretical basis for the later cable force testing system.

Landing impact analysis of sports shoes using 3-D coupled foot-shoe finite element model

2009 ◽  
Vol 23 (10) ◽  
pp. 2583-2591 ◽  
Author(s):  
Jin-Rae Cho ◽  
Seung-Bum Park ◽  
Sung-Hyun Ryu ◽  
Sung-Ho Kim ◽  
Shi-Bok Lee
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Analysis ◽  
Element Model ◽  
Landing Impact ◽  
Sports Shoes

scholarly journals Influences of shaker armature dynamics on periodic force measurement

ACTA IMEKO ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 42
Author(s):  
Saher R. Hassan ◽  
Christian Schlegel ◽  
Rolf Kumme
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Measurement Uncertainty ◽  
Dynamic Behaviour ◽  
Force Measurement ◽  
Element Model ◽  
Periodic Force ◽  
Mechanical Structure ◽  
Harmonic Analyses

In this article, we investigate the influence of the shaker armature’s mechanical structure on periodic force measurement, with particular emphasis on measurement uncertainty. In order to perform modal and harmonic analyses of the measurement setup, a finite element model was iteratively developed. The model was validated by measurements with a scanning vibrometer. The results show that the dynamic behaviour of the shaker armature should be taken into consideration before carrying out a periodic force measurement.

Impact Analysis of a Full Model Doublet-Type Spacer Grid in the Fuel Assembly of a PWR

2004 ◽  
Author(s):  
K. J. Park ◽  
Y. D. Kwon ◽  
G. J. Park ◽  
K. N. Song ◽  
K. H. Yoon
Keyword(s):  
Finite Element ◽  
Fuel Assembly ◽  
Impact Analysis ◽  
Impact Load ◽  
Element Model ◽  
Full Model ◽  
Spacer Grid ◽  
Element Analysis ◽  
Partial Model ◽  
External Impact

A spacer grid is one of the main structural components in the fuel assembly of a Pressurized Light Water Reactor (PWR). It supports fuel rods and maintains geometry from external impact loads. In ICONE10, a paper was published for impact analysis of a partial model spacer grid. A five by five grid model was established and the analysis results were discussed. At this moment, a full model with a sixteen by sixteen grid is analyzed for impact analysis. This grid has a new doublet-type shape. The finite element model with 16×16 grid cells is established for nonlinear analysis. It is composed of inner straps, outer straps, guide thimbles, etc. The model is considered the aspects of welding and the contacts between the components. The critical impact load that leads to plastic deformation is identified. Nonlinear finite element analysis is carried out by a software system called ABAQUS/EXPLICIT. The results are discussed in the context of the previous results from the partial model and incorporation of the analysis results into the design change is discussed.

scholarly journals Bayesian Prediction of Pre-Stressed Concrete Bridge Deflection Using Finite Element Analysis

Sensors ◽  
2019 ◽  
Vol 19 (22) ◽  
pp. 4956
Author(s):  
Jaebeom Lee ◽  
Kyoung-Chan Lee ◽  
Sung-Han Sim ◽  
Junhwa Lee ◽  
Young-Joo Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Prediction Models ◽  
Measurement Data ◽  
Element Model ◽  
Time Dependent ◽  
Probabilistic Prediction ◽  
Element Analysis ◽  
Actual Measurement ◽  
Railway Bridges

Vertical deflection has been emphasized as an important safety indicator in the management of railway bridges. Therefore, various standards and studies have suggested physics-based models for predicting the time-dependent deflection of railway bridges. However, these approaches may be limited by model errors caused by uncertainties in various factors, such as material properties, creep coefficient, and temperature. This study proposes a new Bayesian method that employs both a finite element model and actual measurement data. To overcome the limitations of an imperfect finite element model and a shortage of data, Gaussian process regression is introduced and modified to consider both, the finite element analysis results and actual measurement data. In addition, the probabilistic prediction model can be updated whenever additional measurement data is available. In this manner, a probabilistic prediction model, that is customized to a target bridge, can be obtained. The proposed method is applied to a pre-stressed concrete railway bridge in the construction stage in the Republic of Korea, as an example of a bridge for which accurate time-dependent deflection is difficult to predict, and measurement data are insufficient. Probabilistic prediction models are successfully derived by applying the proposed method, and the corresponding prediction results agree with the actual measurements, even though the bridge experienced large downward deflections during the construction stage. In addition, the practical uses of the prediction models are discussed.

Ballistic Impact Analysis of the Human Thorax With a Protective Body Armor

2000 ◽  
Author(s):  
Y. W. Kwon ◽  
J. E. Jolly ◽  
T. A. Hughes
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Impact Analysis ◽  
Element Model ◽  
The Body ◽  
Body Armor ◽  
Element Analysis ◽  
Essential Components ◽  
Human Thorax ◽  
Armor System

Abstract The biomechanical response of a finite element model of the human thorax and a protective body armor system was studied under impact loading from a projectile. The objective of the study was to create a viable finite element model of the human thorax. The model was validated by comparing the results of tests of body armor systems conducted on cadavers to results obtained from finite element analysis. A parametric study was undertaken to determine the essential components of the model. The results from this investigation determined that the path of force propagation from a body armor system to the thorax upon bullet impact is directly through the vest to the sternum and then through the skeleton to the rest of the body. Thus, any parameters that affect the components in this pathway were essential to the model. This included the muscles, their geometries, material properties, and viscosity, as well as the Young’s modulus of the sternochondral cartilage and the bones themselves.

Singular Perturbation Method for Solving Non-Linear Vibration of Stay Cable (II) - Engineering Application

2011 ◽  
Vol 147 ◽  
pp. 117-121
Author(s):  
Zhi Hong Ran ◽  
Jun Tong Qu ◽  
Fei He ◽  
Sheng Miao
Keyword(s):  
Singular Perturbation ◽  
Perturbation Method ◽  
Engineering Application ◽  
Stay Cable ◽  
Singular Perturbation Method ◽  
Frequency Method ◽  
Measuring Techniques ◽  
Non Linear ◽  
Cable Force ◽  
Set Up

According to vibration characteristic of cable in cable-stayed bridges, the non-linear dynamic model of cables was set up. The vibration differential equation is deduced using the singular perturbation method. The stiffness and coupling boundary conditions of simple and fixed are introduced in the cable force analysis. The useful formulation of measuring techniques for cable force using frequency method is advanced. Results of analyses indicate that the formulation is high in accuracy and convenient in practice. The formulation was used to the cable-stayed construction control of Nanjing Yangtze River No.3 Bridge. The cable force was calculated with test data of vibration, and compared to cable force of design and pressure sensor. The method can be widely used for field of measurement during the construction of cable system structures.

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