A Method for Detecting Abnormal Changes in the Temperature Field of Grain Bulk Based on HSV Features of Cloud Maps

2020 ◽  
Vol 63 (5) ◽  
pp. 1181-1191
Author(s):  
Cui Hongwei ◽  
Wenfu Wu ◽  
Zidan Wu ◽  
Feng Han
Keyword(s):  
Temperature Field ◽  
Temperature Data ◽  
Bulk Temperature ◽  
List Type ◽  
Improved Method ◽  
Temperature Changes ◽  
Feature Similarity ◽  
Grain Bulk ◽  
Normal Storage ◽  
Grain Temperature

HighlightsAbnormal grain temperature changes were detected by calculating the similarity of HSV features in cloud maps.The F-measures were higher for the improved method than for methods based on HSV and LBP feature similarity.The improved method can detect abnormal heating of grain due to mold activity or spoilage and the fluctuation in grain temperature caused by aeration.The temperature field of the grain bulk in adjacent time periods has high similarity during normal storage.Abstract. Analyses of grain temperature data are time-consuming and labor-intensive, and thorough analyses are difficult to perform. This article proposes an improved method based on the hue, saturation, and value (HSV) color feature similarity of temperature field cloud maps to detect abnormal changes in grain temperature. Historical grain temperature data are preprocessed to generate temperature field cloud maps. The improved method based on HSV feature similarity is used to calculate the similarity of temperature field cloud maps for two successive days during normal storage, and a similarity threshold is set. Five types of grain bulk temperature anomalies are then simulated. Additionally, a comparative experiment is carried out that considers traditional methods based on HSV feature similarity and local binary pattern (LBP) feature similarity. The results show that the average recall rates of the F-measures of the improved method, the traditional method based on HSV feature similarity, and the method based on LBP feature similarity are 96.2%, 89.3%, and 95.4%, respectively, and the processing speeds are 340, 300, and 690 ms per group, respectively. Finally, an abnormal grain temperature experiment is carried out. The experimental results show that the improved method can detect sudden changes in the temperature field due to mold activity or spoilage and the fluctuations in grain temperature caused by aeration. Keywords: Grain storage, HSV feature, LBP feature, Similarity, Temperature.

An Improved Method for Calculating the Freezing/Thawing Index Using Monthly and Annual Temperature Data

2021 ◽  
Author(s):  
Chang Liu ◽  
Song Feng ◽  
Wei Huang
Keyword(s):  
Temperature Data ◽  
Improved Method

scholarly journals Procedure for determining the thermoelastic state of a reinforced concrete bridge beam strengthened with methyl methacrylate

2021 ◽  
Vol 4 (7(112)) ◽  
pp. 26-33
Author(s):  
Vitalii Kovalchuk ◽  
Yuliya Sobolevska ◽  
Artur Onyshchenko ◽  
Olexandr Fedorenko ◽  
Oleksndr Tokin ◽  
...  
Keyword(s):  
Temperature Field ◽  
Reinforced Concrete ◽  
Methyl Methacrylate ◽  
Concrete Beam ◽  
Vertical Direction ◽  
Reinforced Concrete Beam ◽  
Temperature Stresses ◽  
Temperature Changes ◽  
Structural Reinforcement ◽  
Elasticity Module

This paper reports the analysis of methods for determining temperature stresses and deformations in bridge structures under the influence of climatic temperature changes in the environment. A one-dimensional model has been applied to determine the temperature field and thermoelastic state in order to practically estimate the temperature fields and stresses of strengthened beams taking into consideration temperature changes in the environment. The temperature field distribution has been determined in the vertical direction of a reinforced concrete beam depending on the thickness of the structural reinforcement with methyl methacrylate. It was established that there is a change in the temperature gradient in a contact between the reinforced concrete beam and reinforcement. The distribution of temperature stresses in the vertical direction of a strengthened reinforced concrete beam has been defined, taking into consideration the thickness of the reinforcement with methyl methacrylate and the value of its elasticity module. It was established that the thickness of the reinforcement does not have a significant impact on increasing stresses while increasing the elasticity module of the structural reinforcement leads to an increase in temperature stresses. The difference in the derived stress values for a beam with methyl methacrylate reinforcement with a thickness of 10 mm and 20 mm, at elasticity module E=15,000 MPa, is up to 3 % at positive and negative temperatures. It has been found that there is a change in the nature of the distribution of temperature stresses across the height of the beam at the contact surface of the reinforced concrete beam and methyl methacrylate reinforcement. The value of temperature stresses in the beam with methyl methacrylate reinforcement and exposed to the positive and negative ambient temperatures increases by three times. It was established that the value of temperature stresses is affected by a difference in the temperature of the reinforced concrete beam and reinforcement, as well as the physical and mechanical parameters of the investigated structural materials of the beam and the structural reinforcement with methyl methacrylate

scholarly journals Density-thermal dependence of sedimentary associations calls to reinterpreting detailed gravity surveys

2015 ◽  
Vol 58 ◽  
Author(s):  
Vagif G. Gadirov ◽  
Lev V. Eppelbaum
Keyword(s):  
Gravity Field ◽  
Underground Water ◽  
Temperature Data ◽  
Field Analysis ◽  
Thermal Dependence ◽  
Temperature Changes ◽  
Buried Objects ◽  
Gravity Effects ◽  
Hydrocarbon Deposits ◽  
Hydrocarbon Deposit

<p>The modern gravimetric equipment allows to register very small effects of gravity field changes and can be applied solving different geological, geophysical and environmental problems. However, sometimes insufficient calculation of various kinds of geological noise complicates effective application of detailed gravity field analysis. One of such factors is the temperature regime over and outside different buried objects of investigation. In this paper temperature changes in a subvertical zone over a hydrocarbon deposit and outside its contour are analyzed. The integrated density change and corresponding gravity effects are calculated for the Muradkhanly oil deposit situated within the south-east part of the Middle Kura Depression (central Azerbaijan). Calculation of these effects on the basis of density- temperature data correlation analysis could significantly improve the microgravity field examination over the hydrocarbon deposits. The similar correction procedure may be applied also over underground water horizons and some environmental targets.</p>

Analytic Methods of Main Cable Initial Curve Calculation in Variable Temperature Field

2010 ◽  
Vol 163-167 ◽  
pp. 307-312
Author(s):  
Xiang Ren
Keyword(s):  
Temperature Field ◽  
Variable Temperature ◽  
Suspension Bridge ◽  
Horizontal Component ◽  
Length Variation ◽  
Calculation Methods ◽  
Initial Curve ◽  
Temperature Changes ◽  
Main Cable ◽  
Cable Forces

In order to study temperature effect on initial curve of main cable, three different temperature models were built about temperature changes of main cable along span direction, and iteration calculation methods to find initial curve of main cable in variable temperature field was proposed based on the theory that the length of non-stress wire strand is persistence in unloaded cable station and construction completion station. The catenary equation in variable temperature field was deduced and the suspender length variation as well as horizontal component of cable forces were calculated based on the catenary equation. Taking some suspension bridge for an example, suspender length variation, horizontal component of the cable forces and node coordinate under three different temperature models were calculated by iteration calculation methods.

Influence of bulk temperature field on heavy-load gears

2016 ◽  
Author(s):  
Yan-Qin Zhang ◽  
Xin-Yang Qiu ◽  
Ming-Shuang Li ◽  
Jin-Lei Zhang
Keyword(s):  
Temperature Field ◽  
Bulk Temperature ◽  
Heavy Load

Numerical Analysis of Lining Temperature Field of Hydraulic Tunnel under the Highway

2010 ◽  
Vol 163-167 ◽  
pp. 1505-1509
Author(s):  
Xiao Yun Jia ◽  
Bao Long Lin
Keyword(s):  
Temperature Field ◽  
Numerical Analysis ◽  
Structural Characteristics ◽  
Crack Control ◽  
Temperature Changes ◽  
Finite Element Software ◽  
Concrete Crack ◽  
Geological Conditions ◽  
North Water ◽  
The Difference

Based on the geological conditions of culvert of the South to North Water Transfer Project, lining temperature field of hydraulic tunnel for crack control is simulated by finite element software—ANSYS. According to numerical analysis results of lining temperature field, considering terrain condition, structural characteristics and climate, some engineering measures are taken during construction. Internal temperature of concrete is controlled effectively, concrete crack caused by temperature changes is solved successfully, and construction quality is assured. The difference of measuring data in-situ and calculating data is very small, which illustrate that calculated model is correct and parameters are reasonable. The results can act as reference for the design and construction of similar projects later.

Temperature Effect Analysis of the Twin Towers Concrete Cable-Stayed Bridge for Construction Control

2013 ◽  
Vol 671-674 ◽  
pp. 1055-1063
Author(s):  
Gui Zhen Wang ◽  
Ying Min Li
Keyword(s):  
Temperature Field ◽  
Temperature Effect ◽  
Great Influence ◽  
Internal Force ◽  
Construction Control ◽  
Effect Analysis ◽  
Temperature Changes ◽  
Distribution Rule ◽  
Cable Force ◽  
Main Girder

It exists a great influence on deformation and internal force of large span bridge when temperature changes, the influence of the temperature must be considered and try to avoid in the process of construction control. Under monitoring to the construction process of Tieluoping super-large bridge on the scene, the influence law on internal force of Tieluoping Bridge is analyzed considering temperature effect, and the influence considering the sunshine temperature difference on cable tower deviation and stress is obtained, and the size of influence of main girder elevation, cable force and strain because of temperature field and distribution rule internal temperature field are clear. It provides powerful help for the smooth construction.

scholarly journals New subsurface temperature maps for the Tertiary Lower Rhine Basin and the adjacent Variscan Basement - Germany, The Netherlands, Belgium

2004 ◽  
Vol 83 (2) ◽  
pp. 135-146 ◽  
Author(s):  
H. Karg ◽  
C. Bücker ◽  
R. Schellschmidt
Keyword(s):  
Temperature Field ◽  
Coal Mine ◽  
Temperature Data ◽  
Depth Interval ◽  
Subsurface Temperature ◽  
Rhine Basin ◽  
Lower Rhine Basin ◽  
Temperature Maps ◽  
Variscan Basement ◽  
Lower Rhine

AbstractThe regional subsurface temperature field at the transition between the Palaeozoic Variscan Basement and the Cenozoic Lower Rhine Basin in Dutch, German and Belgium territories was mapped up to a depth of 1000 m. Temperature data from 66 wells and 11 coal mine subcrops were available. In 46 wells, temperature logs, covering a cumulative depth interval of 6600 m, were measured for this study.

Influence factors on bulk temperature field of gear

2016 ◽  
Vol 231 (8) ◽  
pp. 953-964 ◽  
Author(s):  
Biao Luo ◽  
Wei Li
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Convective Heat Transfer Coefficient ◽  
Influence Factors ◽  
Practical Method ◽  
Lubricating Oil ◽  
Bulk Temperature ◽  
Curvature Radius ◽  
Ultimate Cause ◽  
Tooth Surfaces

The convective heat transfer coefficient of different tooth surfaces and the friction heat flux were identified based on the theory of tribology, heat transfer, and gear meshing theory. A more accurate parametric model of finite element thermal analysis of a single tooth was established by using APDL and the more accurate bulk temperature field of the gear was obtained. The factors that affect the bulk temperature field of gears were also analyzed, and the influence mechanism of each factor was carried out. The results show that high-pressure angle and tooth profile modification cannot only effectively reduce the bulk temperature of the gear, but also benefits the distribution of the bulk temperature. Long-addendum gear is beneficial to the distribution of the bulk temperature. The bulk temperature is proportional to the initial temperature of the lubricating oil. The variations of the equivalent curvature radius, the stiffness and the load sharing ratio of the meshing point are the ultimate cause of the change of the bulk temperature. The results of this paper can provide a more accurate and practical method for obtaining the bulk temperature of the gear, and it also can provide a theoretical basis and method to improve the thermal behavior of gears.

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