scholarly journals Numerical calculation of wing-bending moment with real-time strain monitoring by FBG modulation

2017 ◽  
Vol 14 ◽  
pp. 374-378
Author(s):  
Bo Jin ◽  
Weifang Zhang ◽  
Wei Wei ◽  
Xiaobei Liang ◽  
Meng Zhang
Keyword(s):  
Numerical Calculation ◽  
Real Time ◽  
Bending Moment ◽  
Strain Monitoring

scholarly journals Calculation of a beam on an inhomogeneous basis

2018 ◽  
Vol 251 ◽  
pp. 04023
Author(s):  
Nikolaj Atarov
Keyword(s):  
Numerical Calculation ◽  
Power Law ◽  
Modulus Of Elasticity ◽  
Strain Energy ◽  
Deformation Modulus ◽  
Bending Moment ◽  
System Of Differential Equations ◽  
Total Potential ◽  
Modulus Of Deformation ◽  
Symmetric Load

The questions of analytical calculating the beam on the base with the modulus of deformation (modulus of elasticity), which is changed by thickness of the layer by power law, was deals in the article. The purpose of work was receiving finite expressions for reactive pressure of the basе on a beam and internal efforts in a beam when using model of the base with two characteristics (coefficient of subgrade resistance). A system of differential equations second-order with respect to the displacements of points the surface of a layer with a continuously changing modulus of elasticity was obtained based on the minimum of the total potential strain energy. The calculation of the rigid beam on the base on the action of the symmetric load was performed and the formulas for the reactive pressures of the base were got. Numerical calculation is executed and the analysis of influence of change of the module of deformation of a layer by the amount of reactive pressure and the bending moment in a beam was given. It is shown that with increase in the module of deformation on layer thickness the basе with two characteristics on nature of work is approaching vinklerovsky.

scholarly journals Using XFEM to Predict the Damage with Temperature of the Steel Pipe Elbows under Bending and Pressure loading

2020 ◽  
Vol 15 (55) ◽  
pp. 345-359
Author(s):  
Nourddine Hammadi ◽  
Moahmed Mokhtari ◽  
Habib Benzaama ◽  
Kouider Madani ◽  
Abdelkader Brakna ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Calculation ◽  
Internal Pressure ◽  
Structural Damage ◽  
Bending Moment ◽  
Pressure Loading ◽  
Tube System ◽  
Moment Stress ◽  
Calculation Code

The pipes, during their service, are subjected to accumulated loads such as internal pressure and that of the soil. The latter considerably accelerate their damage. In this work, the bending moment stress of API 5L X70 category steel elbows under thermo-mechanical behavior and in the presence of pressure were studied. We used FEM (finite element method) through the numerical calculation code ABAQUS and the XFEM technique for structural damage while using solid elements as a structure. Our objective is to evaluate the response and resistance capacity of the steel elbow by its location in the tube–elbow-tube system under a mixed loading of pressure and moment for all scenarios. It is based on a single standardized dimensioning of the elbow (diameter and thickness). The effect of several parameters has been studied such as the type of loading and the pressure levels, which are clearly conditioned by the level of damage. Numerical damage results are presented by moment-rotation curves. They illustrate the variation in damage as a function of these effects which act simultaneously.

scholarly journals Roof Stability of Rectangle Coal Roadway: In Light of Calculation of Compressive Bar Stability

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ma Shou-Long ◽  
Gao Linsheng ◽  
Yang Yue ◽  
Peng Rui ◽  
Zhao Qifeng
Keyword(s):  
Numerical Calculation ◽  
Critical Pressure ◽  
Bending Moment ◽  
Friction Angle ◽  
Horizontal Stress ◽  
Coal Roadway ◽  
Roadway Stability ◽  
Cohesion Force ◽  
Rock Interface ◽  
Roof Stability

The roadway roof is a key factor to the roadway stability. The analysis of roof stability is mainly based on numerical calculation and on-site observation, while the basic theory of the bearing mechanism is relatively weak. We have founded a critical pressure calculation model, on the theory of compressive bar, for the rectangle coal roadway stability. The model has been tested and verified on accuracy and feasibility while applied on a roadway case. The critical pressure for roof stability and roof bending moment and deflection under combined axial and lateral load was deduced using the theory of compressive bar stability. The numerical calculation verified the feasibility of numerical modeling of stability of compressive bar using FLAC3D, and the influence of the background ambient horizontal stress and the parameters of the contact surface to the roof stability were further studied. The result turns out that some factors lead to a higher instability tendency, including higher horizontal stress, higher cohesion force, and larger internal friction angle on the coal-rock interface and lower cohesion force and smaller friction angle on the rock-rock interface. The results contribute to bearing mechanisms of roadway roof stability, ground pressure and strata control theory and application, and design of bolting support.

Real-Time Strain Monitoring of a Navy Vessel During Open Water Transit

2010 ◽  
Vol 54 (04) ◽  
pp. 225-230
Author(s):  
J. M. Nichols ◽  
M. Seaver ◽  
S. T. Trickey ◽  
E. Aktas ◽  
K. Scandell ◽  
...  
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Fiber Optic ◽  
Primary Source ◽  
Open Water ◽  
Dynamic Strain ◽  
Ship Maneuvers ◽  
Strain Monitoring ◽  
Deck Plate ◽  
Critical Components

In this work we describe the installation of a real-time, fiber-optic strain monitoring system aboard a US Navy vessel undergoing sea trials. The system is lightweight, unintrusive, corrosion resistant, and provides dynamic strain response measurements from direct current (DC) up to 360 Hz. Also described are the data acquisition and subsequent analysis. The goals of the study were to demonstrate a fiber-optic strain monitoring system under real world conditions and to better understand the source of deck cracking above an area housing mission-critical components. The results of the two-day trial indicate that there exist large stresses in the deck plate during normal ship operation. Based on the results, it is clear that ship maneuvers, slewing of the radar located on the deck plate, and insolation-related effects are not the primary source of the observed stress.

Teaching Systems and Control Using Matlab

1992 ◽  
Vol 29 (3) ◽  
pp. 235-242 ◽  
Author(s):  
J. L. Rodgerson ◽  
J. H. Anderson
Keyword(s):  
Numerical Calculation ◽  
Real Time ◽  
Software Package ◽  
Laboratory Work ◽  
Real Time Control ◽  
Laboratory Environment ◽  
Time Control ◽  
Systems And Control ◽  
The University ◽  
And Control

Teaching systems and control using MATLAB The paper describes how the software package MATLAB has been used to remove the burden of numerical calculation from tutorial and laboratory work in the Systems and Control courses at the University of Natal. The package has been enhanced through the addition of two simple commands to enable it to be used to implement real-time control in a laboratory environment.

Real-Time Strain Monitoring of Sand-Control Completions

2010 ◽  
Author(s):  
Denise M. Earles ◽  
Carl W. Stoesz ◽  
Anderson Da Silva Amaral ◽  
Jeremiah Glen Pearce ◽  
Hans DeJongh ◽  
...  
Keyword(s):  
Real Time ◽  
Strain Monitoring ◽  
Sand Control

Real-time monitoring of the longitudinal strain of Continuous Welded Rail for safety improvement

2019 ◽  
Vol 234 (10) ◽  
pp. 1238-1252 ◽  
Author(s):  
A Consilvio ◽  
M Iorani ◽  
V Iovane ◽  
M Sciutto ◽  
G Sciutto
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Human Error ◽  
Calibration Procedure ◽  
Monitoring Systems ◽  
Strain Monitoring ◽  
Safety Improvement ◽  
Continuous Welded Rail ◽  
Rail Inspection ◽  
Human Error Probability

Continuous welded rail maintenance plays a significant role in ensuring high levels of rail traffic and safety. Temperature variations, excessive alignment defects, decreased fastening system resistance and train braking (always in the same stretches and in the same direction) may result in rail buckling or rail breaks. The current traditional monitoring systems and procedures for continuous welded rail consist of programmed discontinuous diagnostic surveys that require personnel intervention on site. Moreover, these traditional systems often imply destructive and invasive operations on the track that may lead to interruption of railway operations. This paper proposes a Rail Strain Monitoring System (RSMS) that performs a real-time rail strain monitoring and allows rail inspection without personnel on site. Using strain gauges and temperature sensors, placed on the rail in specific measurement points, the proposed Rail Strain Monitoring System performs a multi-parameter check by measuring, at the same time, the temperature, the rail strain and the neutral temperature of the rail. The paper describes the mode of operation of the Rail Strain Monitoring System, the calibration procedure and the results from the field, and highlights the advantages of this system in comparison to other traditional monitoring systems. The safety improvement that can be achieved with the application of the Rail Strain Monitoring System is analysed. In particular, the reliability of the system is evaluated and compared to the human error probability in the traditional manual inspections. Finally, the reduction of derailment risk and related economic damages is estimated.

OSG-Based Modeling of the Flexural Deformation of the Crane’s Main Arm

2012 ◽  
Vol 190-191 ◽  
pp. 139-142
Author(s):  
Qian Wang Deng ◽  
Ze Wu Wu ◽  
Qing Fan ◽  
Yu Ru Hu
Keyword(s):  
Numerical Calculation ◽  
Real Time ◽  
Large Deflection ◽  
Practical Significance ◽  
Deformation Model ◽  
Practical Situation ◽  
Advantages And Disadvantages ◽  
Wire Frame ◽  
Time Shape ◽  
Frame Method

Because of the large deflection deformation of crane’s main arm, it is difficult to display the real-time shape of the crane’s main arm and also is necessary to display the deformed main arm to increase the realism of the system in the development of a system platform to simulate crane operation in practical situation. There is a few research in this area, therefore the study of the flexural deflection of the main arm of crane modeling method has important practical significance for engineering. This paper first briefly introduces the main arm of crane's deflection numerical calculation theory, then explores the application of OSG through three different ways to establish the occurrence of deformation model of the crane’s main arm, then compares their advantages and disadvantages, and finally finds that the display effect by the wire frame method to establish the occurrence of flexural deformation model of the crane’s main arm is the best, and gives a simple example to illustrate that.

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