TOP JOINT STUDY ON TEMPERATURE STRESS FOR SUPER-LONG SLAB-COLUMN STRUCTURE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5643-5648
Author(s):  
MINGHAI DONG ◽  
LI SONG ◽  
YING SHAO
Keyword(s):  
Temperature Stress ◽  
Temperature Difference ◽  
Engineering Problem ◽  
Column Structure ◽  
Practical Engineering ◽  
Stress And Deformation ◽  
Bottom To Top ◽  
Practical Engineering Problem ◽  
Joint Method ◽  
Temperature Crack

In this paper, top joint method is proposed to solve a practical engineering problem of temperature stress and temperature crack of super-long slab-column structure bearing temperature difference. From the study, it is shown that as for super-long slab-column structure undergoing temperature difference of inside and outside, joint located in bottom stories nearly has no influence on temperature stress and deformation while joint in top stories can significantly reduce temperature stress and deformation of super-long slab-column structures. In addition, comparison of joints located in top one story, top several stories and from bottom to top stories indicates that influences of them on temperature stress and deformation are similar. As for top joint method, among which cantilever plate method, double column method and corbel method are discussed and results indicate that influence effects of these methods on structures are similar.

Contact Stress Analysis of Gear of Crane Gearbox

2007 ◽  
Author(s):  
Zhonglai Wang ◽  
Bo Yang ◽  
Hong-Zhong Huang ◽  
Qiang Miao ◽  
Dan Ling
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Contact Stress ◽  
Optimization Method ◽  
Probability Of Failure ◽  
Engineering Problem ◽  
Gear Transmission ◽  
Practical Engineering ◽  
Practical Engineering Problem

Gears are widely used in many practical engineering to transmit torque. In the process of meshing, contact stress will be produced which causes pitting. Shock becomes more and more serious with the increase of pitting and the probability of failure of meshing gears increases. Contact stress analysis is necessary and important to increase the reliability of gear transmission. In this paper, a fuzzy Hertz approximate optimization method and finite element method are used to deal with a practical engineering problem.

Meso-Scale Oriented Physical Simulation Model for Complex Product Maintenance in Virtual Environment

2013 ◽  
Vol 706-708 ◽  
pp. 1954-1957
Author(s):  
Gao Liang Peng ◽  
Hong Liang ◽  
Xin Li
Keyword(s):  
Physical Simulation ◽  
Significant Loss ◽  
Engineering Problem ◽  
Large Component ◽  
Operation Process ◽  
Simulation Strategy ◽  
Practical Engineering ◽  
Surface Visualization ◽  
Practical Engineering Problem ◽  
Important Significance

Large component disassembly is complex tasks, the collision during the operation process often cause component damage and deform, even bring safe accident and result in significant loss. This paper proposes to use Meso-dimential oriented physical simulation strategy to research the collision effect simulation and damage surface visualization of large component during disassembly operation. Meso-collide behavior of multi-particles is adapted to simulate the macro-collision of large component. The method has important significance for expanding the mechanical simulation theory and solving the complex practical engineering problem.

scholarly journals Fuzzy Reliability Theory Based on Membership Function

2016 ◽  
Vol 1 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Shshank Chaube ◽  
S. B. Singh
Keyword(s):  
Membership Function ◽  
Real Life ◽  
Reliability Theory ◽  
Engineering Problem ◽  
Point Of View ◽  
Fuzzy Reliability ◽  
Reliability Parameters ◽  
Problem Method ◽  
Practical Engineering ◽  
Practical Engineering Problem

In this study, it is considered that the shape of membership function and the values of parameters are arbitrary, hence reliability parameters will be arbitrary, and some data are even absurd from the point of view of real life practice. An applied fuzzy reliability theory is applied to practical engineering problem. Method of fuzzy reliability evaluation are developed.

scholarly journals Hopfield Neural Network Method for Problem of Telescoping Path Optimization of Single-Cylinder Pin-Type Multisection Boom

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Yan Mao ◽  
Kai Cheng
Keyword(s):  
Neural Network ◽  
Mathematic Model ◽  
Hopfield Neural Network ◽  
Engineering Problem ◽  
Efficiency Factor ◽  
Path Optimization ◽  
Single Cylinder ◽  
Practical Engineering ◽  
Practical Engineering Problem ◽  
Term Data

Telescoping path optimization (TPO) of single-cylinder pin-type multisection boom (SPMB) is a practical engineering problem that is valuable to investigate. This article studies the TPO problem and finds the key of TPO is to obtain the maximum retraction backmost combination. A mathematic model on the basis of the quadratic penalty function of a Hopfield neural network (HNN) is constructed. Two strategies are presented to improve the performance of TPO model: one is proportional integral derivative (PID) strategy that adaptively adjusts the parameter λ of the constrained term and the parameter γ of the optimization objective term by controlling the value of constraint violation gk and the other is efficiency factor strategy that an efficiency factor is introduced in model for prioritizing the constrained term over the objective term. Data test shows that compared with the path of boom length changing before optimization, both the number of sections that need to be moved and the total travels of cylinder can be reduced by 10%-30% after optimization. Both the PID strategy and the efficiency factor strategy achieve good optimization effects. The efficiency factor strategy is excellent at moderating the conflicts between the constrained term and the objective term; thus the generations of the valid and the optimal solutions get well improved.

Idealized Methods for Nonlinear Welding Mechanics

2016 ◽  
Author(s):  
Hidekazu Murakawa
Keyword(s):  
Large Scale ◽  
Engineering Problem ◽  
Welding Distortion ◽  
Powerful Method ◽  
Deformation Method ◽  
Large Structures ◽  
Computational Welding Mechanics ◽  
Practical Engineering ◽  
Inherent Deformation ◽  
Practical Engineering Problem

Computational Welding Mechanics is established by Prof. Yukio Ueda and it has become an indispensable and powerful method for understanding complex mechanical phenomena in welding. To tackle practical engineering problem, large scale transient nonlinear problem must be solved. For this, various “Idealized Methods” for welding mechanics were proposed. Among them, Iterative Substructure Method for transient nonlinear welding problem and Inherent Deformation Method for prediction of welding distortion of large structures are presented together with their application to practical problems.

Research and Design of Simple Numerical Control System of Valve Block Processing

2013 ◽  
Vol 364 ◽  
pp. 280-284
Author(s):  
En Tao Zhou ◽  
Jun Zhe Lin ◽  
Lin Tao ◽  
Xiao Liang Chen ◽  
Chen Song
Keyword(s):  
Control System ◽  
Engineering Problem ◽  
Numerical Control ◽  
Numerical Control System ◽  
Plc Control ◽  
Practical Engineering ◽  
Design And Manufacture ◽  
Automatic Positioning ◽  
Research And Design ◽  
Valve Block

During the design and manufacture of hydraulic system, valve block of processing is time-consuming and labor-intensive, and its easy to make a mistake. In this paper, a simple numerical control system based on PLC control to solve the practical engineering problem is studied. An automatic positioning based on parameters of holes which are drawn by AutoCAD and an automatic machining of holes can be realized by the control system. Its also discussed that the method and process of the design of software and hardware.

Model Validation Methods for Multiple Correlated Responses via Covariance-Overlap Based Distance

2019 ◽  
Vol 142 (4) ◽  
Author(s):  
Jiexiang Hu ◽  
Ping Jiang ◽  
Qi Zhou ◽  
Austin McKeand ◽  
Seung-Kyum Choi
Keyword(s):  
Engineering Design ◽  
Model Validation ◽  
Computational Models ◽  
Engineering Problem ◽  
Cumulative Probability ◽  
Global Evaluation ◽  
Correlated Responses ◽  
Validation Methods ◽  
Engineering Design Problems ◽  
Practical Engineering

Abstract Model validation methods have been widely used in engineering design to provide a quantified assessment of the agreement between simulation predictions and experimental observations. For the validation of simulation models with multiple correlated outputs, not only the uncertainty of the responses but also the correlation between them needs to be considered. Most of the existing validation methods for multiple correlated responses focus on the area metric, which only compares the overall area difference between the two cumulative probability distribution curves. The differences in the distributions of the data sets are not fully utilized. In this paper, two covariance-overlap based model validation (COMV) methods are proposed for the validation of multiple correlated responses. The COMV method is used for a single validation site, while the covariance-overlap pooling based model validation (COPMV) method can pool the evidence from different validation sites into a scalar measure to give a global evaluation about the candidate model. The effectiveness and merits of the proposed methods are demonstrated by comparing with three different existing validation methods on three numerical examples and a practical engineering problem of a turbine blade validation example. The influence of sample size and the number of partitions in the proposed methods are also discussed. Results show that the proposed method shows better performance on the uncertainty estimation of different computational models, which is useful for practical engineering design problems with multiple correlated responses.

Contact Stress FEM Analysis of Deep Groove Ball Bearing Based on ANSYS Workbench

2014 ◽  
Vol 574 ◽  
pp. 21-26 ◽  
Author(s):  
Hua Rong Xin ◽  
Lin Zhu
Keyword(s):  
Contact Stress ◽  
Ball Bearing ◽  
Fem Analysis ◽  
Bearing Contact ◽  
Deep Groove ◽  
Deep Groove Ball Bearing ◽  
Rolling Elements ◽  
Practical Engineering ◽  
Stress And Deformation ◽  
Ansys Workbench

The 3D nonlinear contact model of a deep groove ball bearing was established in ANSYS Workbench software. With the reasonable setting of the boundary conditions,the contact stress and deformation are calculated in Static Structural (ANSYS) by using the finite element method,and the contact stress and deformation of the inner ring, the outer ring and the rolling elements were obtained. Furthermore, the computational values are consistent with the Hertz values. The results show that solving the bearing contact problem with ANSYS Workbench software is feasible and it coincides with the stress and deformation of the actual situation. The FEM results provide reference for the design,optimization and failure analysis of rolling bearings and have practical engineering value.

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