Noise and structural characteristics of high-T c superconductor films and the numerical simulation of bolometers based on such films

2007 ◽  
Vol 33 (7) ◽  
pp. 548-551
Author(s):  
D. A. Khokhlov ◽  
I. A. Khrebtov ◽  
S. V. Baryshev ◽  
A. V. Bobyl ◽  
A. A. Ivanov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Structural Characteristics ◽  
Superconductor Films

scholarly journals Key Aspects of the Proper Formulation of the Model in Numerical Analysis of the Influence of Mining Exploitation on Buildings

2015 ◽  
Vol 36 (2) ◽  
pp. 17-28
Author(s):  
Lucyna Florkowska ◽  
Jan Walaszczyk
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Numerical Modelling ◽  
Underground Mining ◽  
Structural Characteristics ◽  
Number Of Factors ◽  
Proper Formulation ◽  
Key Aspects ◽  
The Impact ◽  
Complex Matter

Abstract Numerical modelling is an important tool used to analyse various aspects of the impact of underground mining on existing and planned buildings. The interaction between the building and the soil is a complex matter and in many cases a numerical simulation is the only way of making calculations which will take into consideration the co–existence of a number of factors which have a significant influence on the solution. The complexity of the matter also makes it a difficult task to elaborate a proper mathematical model – it requires both a thorough knowledge of geologic conditions of the subsoil and the structural characteristics of the building. This paper discusses the most important problems related to the construction of a mathematical model of a building-mining subsoil system. These problems have been collected on the basis of many years of experience the authors have in observing the surveying and tensometric deformations of the rock–mass and buildings as well as in mathematical and numerical modelling of the observed processes.

Numerical Simulation and Optimal Design Investigation on Air Duct of Floor Standing Air-Conditioner

2011 ◽  
Vol 308-310 ◽  
pp. 563-567
Author(s):  
Zhong Min Wan ◽  
Zu Yi Zheng ◽  
Huan Xin Chen ◽  
Jun Liu ◽  
Ting Xiang Jin
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Aerodynamic Characteristic ◽  
Volume Flow Rate ◽  
Structural Characteristics ◽  
Flow Characteristics ◽  
Volume Flow ◽  
Numerical Results ◽  
Air Conditioner ◽  
Duct Flow

According to the structural characteristics of floor standing air-conditioner，three dimensional numerical model of air duct system for a certain floor standing air-conditioner is developed to simulate aerodynamic characteristic of the air duct. Flow characteristics and deficiency of air duct for original floor standing air-conditioner are analyzed, and the optimal schemes of air duct are raised and numerical simulation has been carried on to obtain aerodynamic characteristic of the new air duct. The numerical results show that the volume flow rate of air-conditioner with new air duct is increased by 6.1%. The experimental results of air-conditioner with new air duct show the volume flow rate of new air duct is promoted by 5.6% at the same approximate noise level. The numerical results agree well with the previous experiment.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

Computational Simulation for Static and Dynamic Load of Rectangular Plate in Elastic Region for Analysis of Impact Resilient Structure

2012 ◽  
Vol 225 ◽  
pp. 150-157 ◽  
Author(s):  
Harijono Djojodihardjo ◽  
Hamed Jamali ◽  
Alireza Shokrani ◽  
Faizal Mustapha ◽  
Rizal Zahari ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Parametric Study ◽  
Computational Algorithm ◽  
Structural Characteristics ◽  
Computational Simulation ◽  
Elastic Region ◽  
Numerical Code ◽  
Response Analysis ◽  
Generic Structure ◽  
Static And Dynamic Analysis

Impact resilient structures are of great interest in many engineering applications varying from civil, land vehicle, aircraft and space structures, to mention a few examples. To design such structure, one has to resort fundamental principles and take into account progress in analytical and computational approaches as well as in material science and technology. With such perspective, the first objective of this work is to develop a computational algorithm to analyze flat plate as a generic structure subjected to impact loading for numerical simulation and parametric study without considering the surface impact effect. The analysis is carried out from first principles for static and dynamic analysis; the latter is based on dynamic response analysis in the elastic region. The second objective is to utilize the computational algorithm for direct numerical simulation, and as a parallel scheme, commercial off-the shelf numerical code is utilized for parametric study, optimization and synthesis. Through such analysis and numerical simulation, effort is devoted to arrive at optimum configuration in terms of loading, structural dimensions, and material properties, among others. The codes developed are validated for generic cases. Further simulations are carried out using commercial codes for some sample applications to explore impact resilient structural characteristics in the elastic region.

ACSR Strands Stress Numerical Simulation

2012 ◽  
Vol 256-259 ◽  
pp. 710-713
Author(s):  
Li Qin ◽  
Jun Kuo Li ◽  
Qiang Fu
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Principal Part ◽  
Concentration Level ◽  
Structural Characteristics ◽  
Stress And Strain ◽  
Electricity Power ◽  
Distribution Of Stress

As an important carrier of electricity power, ACSR is a principal part of power system and is directly related to the transmission line reliability and safety. ACSR strands stress analysis is the foundation of studying ACSR mechanical properties. In this paper, finite element method is used to analysis the Acsr strands stress. The structural characteristics of Acsr is considered and the complete Acsr model is created by ansys to simulate the distribution of stress and strain under appropriate boundary conditions. The Conclusions are drawn that both the state of strands stress and the stress concentration level are related with its structural properties. The strands of out layers bears more stress and firstly comes into plastic strain. The results of the research is helpful to the further study of ACSR strength and conductor fatigue life.

Thermo-Structural Coupling Numerical Analysis of Rectangular Vessel

2014 ◽  
Vol 620 ◽  
pp. 14-17
Author(s):  
Chun Lai Tian ◽  
Shan Zhou ◽  
Li Yong Han
Keyword(s):  
Numerical Simulation ◽  
Contact Surface ◽  
Thermal Condition ◽  
Maximum Stress ◽  
Structural Model ◽  
Structural Characteristics ◽  
Structural Response ◽  
Maximum Displacement ◽  
Structural Coupling ◽  
Contact Surfaces

A rectangular vessel has two contact surfaces with different materials, iron and copper. In order to investigate thermo-structural characteristics of the vessel, the structural model is developed. The structural analysis is coupled with the thermal condition. The numerical simulation model with hex eight-node thermally coupled brick elements is established and solved by finite element method. The results show that the maximum stress with 112.5 MPa is distributed on the contact surface between the different materials. Because of the different materials’ expansions, there is stress concentration on the contact surface. The maximum displacement is 0.27 mm, almost the same at different pressure loads. The maximum stress increased to about 300 MPa as the temperature increase. The structural response caused by thermal expansion is important for the vessel design.

Electrical characteristics of semiconductor bridge initiator-automobile airbag igniters

2017 ◽  
Vol 31 (19-21) ◽  
pp. 1740018
Author(s):  
Mingfang Liu ◽  
Lin Yu ◽  
Xia Han
Keyword(s):  
Numerical Simulation ◽  
Melting Point ◽  
Energy Input ◽  
Structural Characteristics ◽  
Electrical Characteristics ◽  
Working Process ◽  
Oxide Layers ◽  
Current Trends ◽  
Different Dimensions ◽  
Ignition Characteristics

To study the ignition characteristics of semiconductor bridges (SCB) for automobile airbag igniters, a model was proposed to compute the electrical characteristics of SCB based on the structural characteristics, resistance properties, and the working process of the bridge. Numerical simulation was conducted to analyze the voltage and current trends at two ends of bridges with various geometric dimensions and those with identical geometric dimensions and oxide layers of different thicknesses. Voltage–current curves for bridges of three different dimensions were obtained through numerical simulation. Bridges of larger geometric dimensions were found to require higher voltage to reach the melting point, which means higher energy input is required.

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Actuator

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wenchuan Zhao ◽  
Yu Zhang ◽  
Ning Wang
Keyword(s):  
Numerical Simulation ◽  
Silica Gel ◽  
Dynamic Characteristics ◽  
Design Method ◽  
Structural Characteristics ◽  
Simulation Method ◽  
Structure Design ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Nonlinear Hyperelasticity

The design of a pneumatic soft-bodied bionic actuator derives from the structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel, which can improve the mobility and environmental adaptability of soft-bodied bionic robots. Based on Yeoh’s second-order constitutive model of silica gel, the deformation analysis model of the actuator is established, and the rationality of the structure design and motion forms of the actuator and the accuracy of the deformation analysis model are verified by using the numerical simulation algorithm. According to the physical model of the pneumatic soft-bodied bionic actuator, the motion and dynamic characteristics of the actuator are tested and analyzed, the curves of motion and dynamic characteristics of the actuator are obtained, and the empirical formula of the bending angle and driving torque of the actuator is fitted out. The results show that the deformation analysis model and numerical simulation method are accurate, and the pneumatic soft-bodied bionic actuator is feasible and effective, which can provide a design method and reference basis for the research and implementation of soft-bodied bionic robot actuator.

Study on Model Experiment of Long-Span Steel Truss Arch Bridge

2012 ◽  
Vol 226-228 ◽  
pp. 1604-1608
Author(s):  
Xiang Lin Jiang ◽  
Dong Bing Zhang ◽  
Han Bin Yi
Keyword(s):  
Numerical Simulation ◽  
Structural Characteristics ◽  
Test Point ◽  
Scale Model ◽  
Test Model ◽  
Thin Wall ◽  
Static Test ◽  
Long Span ◽  
Steel Truss ◽  
Distorted Model

This paper based on the structural characteristics of thin-wall steel truss of JiuJiang Yangtze River Bridge, designs a distorted model that thickness ratio is 1/10 and the length ratio is 1/40.Through the static test model, the cross-section stress of hangers chord, diagonal and the deflection of corresponding test point is tested, and the result is compared with numerical simulation result. It shows that the result of the test and numerical simulation satisfy the similar relations, thus verifying that the design of scale model is reasonable and correct.

Study Of Electrical, Chemical And Structural Characteristics Of Superconductor Thin Film Obtained By Polymeric Precursors Method

2004 ◽  
Vol 848 ◽  
Author(s):  
C.L. Carvalho ◽  
R.O. Peruzzi ◽  
D.R. Junior
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Electrical Transport ◽  
Structural Characteristics ◽  
Dip Coating ◽  
Electrical Transport Properties ◽  
Lapse Time ◽  
Bscco System ◽  
Superconductor Films ◽  
Superconductor Thin Films

ABSTRACTSuperconductor films of the BSCCO system have been grown by dip coating technique with good success. The chemical method allows us to grow high temperature superconductor thin films to get better control of stoichiometry, large areas and is cheaper than other methods. There is a great technological interest in growth oriented superconductor films due anisotropic characteristics of superconductor materials of high critical temperature, specifically the cuprates, as we know that the orientation may increase the electrical transport properties. Based on this, the polymeric precursor method has been used to obtain thin films of the BSCCO system. In this work we have applied that method together with the deposition technique known as dip coating to obtain Bi-based superconductor thin films, specifically, Bi1.6Pb0.4Sr2.0Ca2.0Cu3.0Ox+δ, also known as 2223 phase with a critical temperature around 110 K. The films with multilayers have been grown on crystalline substrates of LaAlO3 and orientated (100) after being heat treated around 790°C - 820°C in lapse time of 1 hour in a controlled atmosphere. XRD measurements have shown the presence of a crystalline phase 2212 with a critical temperature around 85 K with (001) orientation, as well as a small fraction of 2223 phase. SEM has shown a low uniformity and some cracks that maybe related to the applied heat treatment. WDS has also been used to study the films composition. Different heat treatments have been used with the aim to increase the percentage of 2223 phase. Measurements of resistivity confirmed the presence of at least two crystalline phases, 2212 and 2223, with Tc around 85 K and 110 K, respectively.

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