scholarly journals PREDICTION METHOD OF LOAD-DISPLACEMENT RELATIONSHIP OF HPFRCC RESPONSE CONTROL ELEMENT, CONSIDERING THE ADDITIONAL AXIAL FORCE DUE TO RESTRAINT EFFECT OF AXIAL DEFORMATION CAUSED BY THE ELEMENTAL ROTATION

2003 ◽  
Vol 68 (574) ◽  
pp. 173-180 ◽  
Author(s):  
Akiyoshi FUKUDA ◽  
Haruhiko SUWADA ◽  
Hiroshi FUKUYAMA ◽  
Masaomi TESHIGAWARA
Keyword(s):  
Axial Force ◽  
Prediction Method ◽  
Control Element ◽  
Axial Deformation ◽  
Response Control ◽  
Load Displacement ◽  
Relationship Of

Study on Prediction of the Peasants’ Income Based on SVM

2014 ◽  
Vol 687-691 ◽  
pp. 5169-5172
Author(s):  
Li Na Zhang ◽  
Bo Yang
Keyword(s):  
Social Factors ◽  
Index System ◽  
Statistical Data ◽  
Influence Factors ◽  
Prediction Method ◽  
Svm Model ◽  
The Index System ◽  
Relationship Of ◽  
System Designs ◽  
Computing Speed

China is a big agricultural country, effective prediction of peasants’ income is very important. This study mainly uses the SVM theory to predict the peasants’ income. By analyzing the influence factors of peasants’ income, establishes the index system, that is corresponding relationship of peasants’ income and factors of social influence, According to this index system, designs the prediction method of peasants’ income based on SVM. Bases on the statistical data of social factors and peasants’ income between 1990-2012 in china, to train the SVM model, at the same time, the kernel function and parameters of SVM used were setting and compared. The experimental results show that the accuracy of RBF function is 90.7%, the time is 98ms, has higher accuracy and faster computing speed.

CALCULATION OF ADDITIONAL AXIAL FORCE OF ANGULAR-CONTACT BALL BEARINGS IN ROTOR SYSTEM

2016 ◽  
Vol 40 (4) ◽  
pp. 585-596
Author(s):  
Zhenhuan Ye ◽  
Zhansheng Liu ◽  
Liqin Wang
Keyword(s):  
Axial Force ◽  
Dynamic Properties ◽  
Descent Method ◽  
Rotor System ◽  
Ball Bearings ◽  
Rolling Bearings ◽  
System A ◽  
Calculation Results ◽  
Relationship Of ◽  
Raphson Method

Based on a loading-deformation relationship of bearing elements and the coordination of displacement between bearings in the rotor system, a model for calculating the additional axial force of angular-contact ball bearings in a single-rotor system is established. Nonlinear equations of this model are solved through the Rapid Descent method and Newton-Raphson method. The simulation results which are based on Gupta’s example verify that both the model and solving methods in this paper are reliable. A pair of 276927NK1W1(H) angular-contact ball bearings in symmetry in the single-rotor system is used as the example, calculation results of the additional axial force of bearings from the model in this paper and from the ISO method are compared and the influence of bearing geometry parameters and working conditions on the additional axial force is further studied. This model and its conclusions could provide the basic data and reference for analyzing the carrying ability and dynamic properties of rolling bearings.

A personalized programming exercise recommendation algorithm based on knowledge structure tree

2021 ◽  
pp. 1-12
Author(s):  
Wei Zheng ◽  
Qing Du ◽  
Yongjian Fan ◽  
Lijuan Tan ◽  
Chuanlin Xia ◽  
...  
Keyword(s):  
Prediction Method ◽  
Knowledge Structure ◽  
Learning Objective ◽  
Cognitive Level ◽  
Real World Data ◽  
Recommendation Algorithm ◽  
Related Data ◽  
Structure Tree ◽  
Learning Programming ◽  
Relationship Of

Personalized exercise recommendation is an important research project in the field of online learning, which can explore students’ strengths and weaknesses and tailor exercises for them. However, programming exercises differs from other disciplines or types of exercises due to the comprehensive of the exercises and the specificity of program debugging. In order to assist students in learning programming, this paper proposes a programming exercise recommendation algorithm based on knowledge structure tree (KSTER). Firstly, the algorithm provides a calculation method for quantifying students’ cognitive level to obtain their knowledge needs through individual learning-related data. Secondly, a knowledge structure tree is constructed based on the association relationship of knowledge points, and a learning objective prediction method is proposed by combining the knowledge needs and the knowledge structure tree to represent and update the learning objective. Finally, KSTER imports a matching operator that calculates cognitive level and exercise difficulty based on learning objectives, and makes top-η recommendation for exercises. Experiments show that the proposed algorithm significantly outperforms the other algorithms in both precision and recall. The comparison experiments with real-world data demonstrate that KSTER effectively improves students’ learning efficiency.

Numerical Method of the Axial Force Moment Curvature on RC Section

2014 ◽  
Vol 610 ◽  
pp. 35-39
Author(s):  
Kai Cheng Yao ◽  
Dong Hua Zhou ◽  
Wen Yuan Liao ◽  
Long Qi Li ◽  
Guo Fei Li ◽  
...  
Keyword(s):  
Numerical Method ◽  
Axial Force ◽  
Analytical Method ◽  
Constitutive Relations ◽  
Plane Section ◽  
Secant Stiffness ◽  
Force Moment ◽  
Relationship Of ◽  
The Relationship ◽  
Good Agreement

Based on the assumption of plane section, ideal elastic-plastic model of steel and the constitutive relations of concrete in Chinese Code for Design of Concrete Structures, numerical method is used to analyze the relationship of the axial force-moment-curvature on RC section. After dividing the normal section into strips, we adopt the secant stiffness iteration method (according to the results of each iteration, modify the secant stiffness through changing the elastic modulus of materials) to compile computer program. The results of the paper show a good agreement with those of the analytical method. Comparing with the analytical method, the numerical method of the paper can be wildly used in the application.

Feasibility Analysis of Reverse Sealed Testing String in HPHT Wells

2014 ◽  
Vol 556-562 ◽  
pp. 2761-2764
Author(s):  
Bao Kui Gao ◽  
Wei Wang ◽  
Xing Qin
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Axial Force ◽  
New Technology ◽  
Feasibility Analysis ◽  
Well Testing ◽  
Axial Deformation ◽  
High Pressure High Temperature ◽  
Key Factor ◽  
Testing Design

To solve problems met in an offshore High-Pressure High-Temperature (HPHT) well testing, a new technology is put forward—placing seal bore extension above permanent packer, and the upper landing tools being connected with seal bore extension through shear pins. This method gives a reverse position of seal bore extension compared with conventional way in which seal bore extension is below permanent packer. So, the feasibility must be considered. Two technological procedures, testing before cutting pins and testing after cutting pins, are discussed, and the highlight is on axial force and deformation of testing string at crucial moments. Results indicate that this new technology is feasible. Of the two technological procedures, axial force is the key factor when testing before cutting pins and axial deformation is the key factor when testing after cutting pins. Conclusions have been used in an offshore HPHT well testing design.

scholarly journals Study on Prediction Method for Postconstruction Settlement of Loess Fill Foundation in Northern Shaanxi, China

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Kui Liu ◽  
Kangze Yuan ◽  
Boyi Shi
Keyword(s):  
Evaluation Criteria ◽  
Prediction Method ◽  
Summation Method ◽  
Power Functions ◽  
Stress Strain ◽  
Creep Equation ◽  
Test Analysis ◽  
Northern Shaanxi ◽  
The Stability ◽  
Relationship Of

In order to solve the problem of shortage of construction land in the loess hilly and gully area of northern Shaanxi, the local people usually adopted the method of excavating and filling. The postconstruction settlement was an important index to evaluate the stability of the loess fill foundation. Through laboratory test analysis, the stress-strain and the strain-time relationship of compacted loess were obtained. It showed that the stress-strain curves varied as power functions, and the relationship between strain and time was hyperbolic. Based on the layerwise summation method, a creep equation to predict the postconstruction settlement of loess fill foundation was established. The field monitoring data show that the fitting effect is better. Using this equation, the postconstruction settlement of loess fill foundation with different compaction coefficients and thickness was predicted. Finally, the stability evaluation criteria of loess fill foundation with various thickness and compaction coefficient were proposed. This method provided a new idea to solve the problem of postconstruction settlement of loess fill foundation.

Establishment of Stress-Strain Relationships of Tailor-Welded Tubes via DIC Method Based on Uniaxial Tensile Tests

2014 ◽  
Vol 611-612 ◽  
pp. 475-482 ◽  
Author(s):  
Hui Ji Jia ◽  
Lian Fa Yang ◽  
Jian Wei Liu
Keyword(s):  
Image Correlation ◽  
Uniaxial Tensile ◽  
Displacement Curve ◽  
Stress Strain ◽  
Material Parameters ◽  
Rule Of Mixtures ◽  
Strain Relationship ◽  
Load Displacement ◽  
Relationship Of ◽  
Strain Method

Tailor-welded tubes are widespread in aircraft and automotive industries due to their advantages of low cost, reduction in part weight and flexibility in mass production. It is necessary to obtain the stress-strain relationship of tailor-welded tubes to study deformation behaviors of tubes and simulate deformation tests of tubes. Then a method via digital image correlation (DIC) method based on uniaxial tensile test (UTT) is proposed in this paper to establish stress-strain relationship of tailor-welded tubes. Material parameters of tailor-welded tubes obtained from three methods, i.e. the method based on UTT, the iso-strain method based on a rule of mixtures and the proposed method, were compared in this paper. To assess the accuracy of material parameters obtained from these three methods, UTTs were simulated, and load-displacement curves and maximal loads obtained from simulations were compared with those obtained from UTTs. In simulations of UTTs, finite element models of specimens of sole parent metal and mixed specimens were established, respectively. The results show that: When HAZ included in the specimen has large proportion of the specimen, the proposed method is more reliable than the iso-strain method based on a rule of mixtures on determining the material parameters of the weld; load-displacement curve and maximal load obtained from the proposed method are more close to those obtained from UTT than those obtained from the method based on UTT.

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