The Application of Digital Cameras in Monitoring Dynamic Deformation of Steel Shelf

2013 ◽  
Vol 405-408 ◽  
pp. 873-877 ◽  
Author(s):  
Cheng Xin Yu ◽  
Xin Hua Ding ◽  
Ming Zhi Chen ◽  
Peng Xiao
Keyword(s):  
Dynamic Stress ◽  
Dynamic Deformation ◽  
High Accuracy ◽  
Digital Cameras ◽  
Instantaneous Deformation ◽  
Rapid Reaction ◽  
The Moment ◽  
Normal Work

Steel shelves are widely used in logistics and warehousing, however, steel shelves often occur instability and other accidents in applications. Many of the destruction are instantaneous. [ Therefore, how to timely monitor the deformation of the shelf, especially the deformation of the shelves on the dynamic stress in the moment to ensure the safe of the shelves is very important. This article describes the method of using digital cameras to monitor dynamic and instantaneous deformation of shelf, which has the characteristics that easy to use, high accuracy, rapid reaction, and observing multi-point once, all-weather use, does not affect the normal work.

Telemetri Flowmeter Menggunakan RF Modul 433MHz

2017 ◽  
Vol 1 (1) ◽  
pp. 8
Author(s):  
Frima Setyawan Nur Rohman ◽  
Ahmadan Ainul Fikri ◽  
Ahmad nur Fuad ◽  
Rahmat Rohim ◽  
Rifki Firmansyah
Keyword(s):  
20Th Century ◽  
Data Transmission ◽  
High Accuracy ◽  
Water Current ◽  
Average Error ◽  
Effective Distance ◽  
Long Distance ◽  
Flow Measurements ◽  
Measuring Device ◽  
The Moment

Abstract - In the 20th century this distance is still a constraint in efforts to measure and retrieve data. In an efficiency effort, a long distance measuring device is required. One method to measure from a distance is to use the Telemetry method. Telemetry is a method for measuring a variable in which monitoring is done remotely. The use of telemetry can be used to transmit data from the flowmeter sensor to be received by the receiver. This study discusses the effect of obstacles on transmitter work to send data to the receiver and test the accuracy of the flowmeter sensor. From this study it can be concluded that the effective distance of data transmission depends on the obstacle, the farthest distance is the moment without obstacles, then decreases when there is a hitch, and will decrease again when one receiver or transmitter is placed in a closed room. And for the accuracy of the sensor, the percentage of accuracy is low at the time of the slow water current, and vice versa high accuracy is obtained when the water current is fast. Based on the research we poured in this journal, water flow measurements using RF Arduino-based 433MHz Modules can measure the flow of water at a distance of up to 35meter with an average error of only 4.1%.

The Application and Comparison of Digital Ground Photogrammetry Technology for Bridge Safety Monitoring

2012 ◽  
Vol 170-173 ◽  
pp. 2979-2986
Author(s):  
Ming Zhi Chen
Keyword(s):  
System Reliability ◽  
Civil Engineering ◽  
Dynamic Deformation ◽  
Large Data ◽  
Safety Monitoring ◽  
Digital Cameras ◽  
Bridge Safety ◽  
Laser Scanners ◽  
Close Range ◽  
Strong System

For needs of transportation, it is more and more obvious of the bridge unsafe, and the study of bridge safety monitor will become more important at the area of civil engineering. In this paper we discuss the methods of digital ground photogrammetry for bridge safety monitoring and the application of those, we took digital cameras and 3-D laser scanners as the tools for close-range photogrammetry, and adopted 3D Time Baseline Parallax combined with Kalman Variance Filters as the theories for monitoring dynamic deformation, then developed software to deal with data, which can draw curves of dynamic deformation automatically, we can monitor the deformation regularity by these curves effectively, then we can monitor and analysis the safety of bridges by this way. The method we designed is very simple and economical, and we also did a lot of experiments to verify availability of this system, and we happy to say that the system has the characteristics of high automation degree, large data collection capacity and strong system reliability, etc. It will be practical value at the area of civil engineering.

Full-field dynamic deformation and strain measurements using high-speed digital cameras

2005 ◽  
Author(s):  
Timothy E. Schmidt ◽  
John Tyson ◽  
Konstantin Galanulis ◽  
Duane M. Revilock ◽  
Matthew E. Melis
Keyword(s):  
High Speed ◽  
Dynamic Deformation ◽  
Digital Cameras ◽  
Full Field ◽  
Strain Measurements ◽  
Field Dynamic

Intervallic Coiflets for Numerical Calculation of Dynamic Stress Intensity Factor

2012 ◽  
Vol 562-564 ◽  
pp. 668-671
Author(s):  
Jian Ping Xuan ◽  
Yuan Feng Liu ◽  
Tie Lin Shi
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Integral Equations ◽  
Dynamic Stress ◽  
Dynamic Stress Intensity Factor ◽  
High Accuracy ◽  
Fredholm Integral Equations ◽  
Wavelet Expansion ◽  
Dual Integral Equations

There are lots of practical problems which are related to the solution of Fredholm integral equations of the second kind. The present work proposes intervallic Coiflets for solving the equations. Illustrative problem involving dynamic stress and electric fields of a cracked piezoelectric excited by anti-plane shear wave is addressed. Permeable boundary condition has been used to obtain a pair of dual integral equations of the symmetric and antisymmetric parts which can be reduced to the solutions of two Fredholm integral equations of the second kind. The dynamic stress intensity factor is expressed in terms of the right-end values of two unknown functions in Fredholm integral equations. The two unknown functions are solved by intervallic Coiflets which have less the endpoints error. And intervallic Coiflets have low calculation cost and high accuracy due to the wavelet expansion coefficients are exactly obtained without calculating the wavelet integrations. The calculation results agree well with the existing method, which show the high accuracy of the estimation and demonstrate validity and applicability of the method.

A method to increase the dynamic deformation of a dielectric elastomer minimum energy structures rotary joint without increase of the voltage amplitude

2019 ◽  
Vol 30 (14) ◽  
pp. 2091-2098
Author(s):  
Shu Wang ◽  
Bo Huang ◽  
David McCoul ◽  
Xinbo Wang ◽  
Jianwen Zhao
Keyword(s):  
Duty Cycle ◽  
Applied Voltage ◽  
Dynamic Deformation ◽  
Minimum Energy ◽  
Dielectric Elastomer ◽  
Voltage Amplitude ◽  
Rotary Joint ◽  
Optimization Principle ◽  
Key Factor ◽  
The Moment

The traditional method to increase the dynamic deformation of a dielectric elastomer actuator is to increase the voltage applied on the dielectric elastomer. Based on the characteristics of dielectric elastomer minimum energy structures, a method to increase the deformation is proposed, which does not increase the applied voltage amplitude. We found that the frequency and duty cycle of the applied voltage will influence the range of deformation strongly, and the moment the power is switched off, [Formula: see text] is a key factor to the deformation range; therefore, the frequency and duty cycle can be optimized to obtain the largest deformation range with an expected vibrational frequency. Two groups of experiments were compared to validate this optimization principle, and the range of deformation with optimized parameters was found to be 1.67 times larger on average than with normal parameters.

Thermal Shock in a Hollow Sphere Caused by Rapid Uniform Heating

1991 ◽  
Vol 58 (1) ◽  
pp. 64-69 ◽  
Author(s):  
Toshiaki Hata
Keyword(s):  
Hollow Sphere ◽  
Dynamic Stress ◽  
Internal Surface ◽  
Displacement Potential ◽  
Stress Problem ◽  
Homogeneous Form ◽  
Stress Functions ◽  
The Moment ◽  
Dynamic Stress Distribution ◽  
Thermoelastic Displacement

This paper is concerned with a method for calculating the dynamic stress distribution in a hollow sphere. Adopting the Goodier’s concept, the dynamic thermoelastic problem in a sphere is decomposed into a particular form of dynamic stress problem corresponding to the thermoelastic displacement potential and the homogeneous form of dynamic stress problem corresponding to the stress functions. Applying the ray theory to the homogeneous form, we obtain the general solution for transient waves induced by sudden heating. When a hollow sphere is subjected suddenly to a uniform temperature rise throughout the sphere, stress waves occur at the internal and external surfaces the moment thermal impact is applied. During instantaneous heating, the interfering effects of these waves can cause a very high dynamic stress at the internal surface of a sphere. The numerical results show that, as the ratio of the internal radius to the external one increases, the tangential stress on the internal surface becomes higher.

scholarly journals Dynamic response of an icosahedral quasi-crystalline medium with a Griffith crack under mechanical loadings

2017 ◽  
Vol 9 (2) ◽  
pp. 168781401668885
Author(s):  
Liangping Qiao ◽  
Li Wu ◽  
Tianyou Fan
Keyword(s):  
Plane Problem ◽  
Dynamic Stress ◽  
Dynamic Deformation ◽  
Coupling Effect ◽  
Dynamic Stress Intensity Factor ◽  
Three Dimensional ◽  
Dynamic Deformation Behavior ◽  
Important Position ◽  
Quasi Crystals ◽  
Crystalline Medium

Elastodynamic response of three-dimensional icosahedral quasi-crystals under mechanical loadings is presented in this article. Two kinds of cases are considered here, in which the plane problem and anti-plane problem are included. The phonon and phason elastic fundamental fields along with their coupling effect in crack analysis are explicitly presented in terms of the theoretical and numerical analyses. Using the finite difference method, some numerical results of stresses, displacements, and normalized dynamic stress intensity factor are obtained. By comparing the results of quasi-crystals, this article reveals the influence of phonon and phason elastic fundamental fields, which occupy an important position in dynamic deformation behavior of quasi-crystals. Of course, phonon–phason coupling effect also should not be neglected.

scholarly journals THE IMPROVING OF THE ACCURACY OF ENGINEERING AND GEODETIC WORKS IN THE CONSTRUCTION AND CONTROL OF THE GEOMETRIC PARAMETERS OF HIGH-RISE BUILDINGS

2020 ◽  
Vol 6 (444) ◽  
pp. 162-168
Author(s):  
T. M. Malik ◽  
◽  
V. G. Burachek ◽  
Ya. P. Bryk ◽  
S. D. Kryachok ◽  
...  
Keyword(s):  
High Accuracy ◽  
Measurement Precision ◽  
Geometric Parameters ◽  
Distance Measurements ◽  
Engineering Structures ◽  
High Rise ◽  
Double Frequency ◽  
Geodetic Coordinates ◽  
The Moment ◽  
And Control

. In the article, the authors had done a brief analysis of existing modern, traditional methods and tools that allow to determine the planned coordinates of geodetic signs, located on the last tier of super-high engineering structures, paid special attention to the disadvantages and concluded that it’s necessary to develop a method and device for determining the geodetic coordinates on ultra-high engineering structures with high accuracy to provide engineering and geodetic works during the construction and operation of high-rise structures. In the article, the authors propose their method and device for determining the planar coordinates of the upper geodetic sign of the line of vertical design on ultra-high engineering structures with high accuracy, which is based on the method of the straight linear resection by the light distance meter. The result of the proposed method is the enhancing of the accuracy of engineering and geodetic works during the construction and control of geometric parameters of high-rise structures. This method of distance measurements allows getting the enhancing of the accuracy of the engineering and geodetic measurements by fixing the moment of occurrence of the double frequency with root mean square error (RMSE) above 0.5 mm, thus eliminating the need to measure the phase difference between direct and reflected pulses. A particular advantage of the proposed method is that the accuracy of the measurements depends on the comparison of the radiated f and double fg frequencies, which makes the measurement precision.

scholarly journals Instrument of determination and prediction of public opinion using IPTV statistic data

2015 ◽  
Vol 3 ◽  
pp. 43
Author(s):  
Vjačeslavs Dubovskis
Keyword(s):  
Public Opinion ◽  
High Accuracy ◽  
The State ◽  
Government Agencies ◽  
Research Organizations ◽  
New Instrument ◽  
Hybrid War ◽  
The Moment

Recent tendencies show an increase of information pressure on Latvia. At the moment, Latvian political figures and government persons have recognized that the country takes a hybrid war. There is a need for a new instrument of determination and prediction of public opinion. The new instrument should allow: profiling audience by identification and prediction of the rate of dissemination of information, forecasting the depth of information, forecasting how public opinion is formed, identifying and previse the adoption of the reported information. The results of the work will create a tool that a variety of institutions will be able to apply it. These institutions may be television channels, government agencies, research organizations, and others. The tool will not only accurately determine the current picture of situation, but also with high accuracy to make forecasts about the state of public opinion

scholarly journals Application of non-metric digital cameras to control the volume of soil displaced when performing earthworks

2020 ◽  
Vol 164 ◽  
pp. 02025
Author(s):  
Nina Rogova
Keyword(s):  
High Frequency ◽  
Digital Technologies ◽  
High Accuracy ◽  
Construction Site ◽  
Digital Cameras ◽  
Main Indicator ◽  
Field Works ◽  
The Cost ◽  
And Control

Moving soil during earthworks at a construction site requires its accounting and control. For this, expensive geodetic methods are widely used, while accounting and control must be performed with high accuracy and frequency. In practice, the use of terrestrial stereophotogrammetric survey can provide a high frequency and accuracy of the results obtained. The traditional stereophotogrammetric survey at this stage undergoes significant changes with the introduction of digital technologies, which allow it to be used more widely. It is proposed to use non-metric digital cameras when performing terrestrial stereophotogrammetric surveys, which will let to reduce the cost of performing the measurement works, as well as to increase the efficiency of field works. The main indicator of the possibility of using the non-metric digital cameras is their resolution, which allows ensuring the accuracy of definitions and acceptable parameters for their calibration.

Sign in / Sign up

Export Citation Format

Share Document