Design and Process Optimization of a New Reaction Cavity for High-Temperature MOCVD AlGaN Growth

NANO ◽  
2021 ◽  
pp. 2150084
Author(s):  
Jiadai an ◽  
Xianying Dai ◽  
Lansheng Feng ◽  
Zhiming Li ◽  
Jieming Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Electronic Devices ◽  
Matrix Analysis ◽  
Element Analysis ◽  
Mocvd Growth ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
Field Velocity ◽  
Uv Luminescence ◽  
Luminescence Detectors

AlGaN offers new opportunities for the development of the solid-state ultraviolet (UV) luminescence, detectors and high-power electronic devices, however, problems such as low growth rate and poor crystallization quality are common in the growing process of AlGaN material. In this paper, a new reaction cavity for high-temperature MOCVD AlGaN growth was carried out through the research of resistance heated, and the thermal field of high-temperature MOCVD growth was numerically simulated. Based on the high-temperature MOCVD reaction cavity, an orthogonal experimental method was used to simulate the process parameters, and the range, variance and matrix analysis were conducted on the calculation results. The finite element analysis was conducted on the temperature field, pressure field, velocity field, and the high-temperature MOCVD AlGaN growth model was established.

The Mechanical Mechanism Analysis for Mortar Arch Framework Slope Protection Structure

2013 ◽  
Vol 859 ◽  
pp. 143-148
Author(s):  
Yang Xu ◽  
Ding Ling Li ◽  
Li Peng ◽  
Yan Xiao ◽  
Yi Hua Nie
Keyword(s):  
Finite Element Analysis ◽  
Mechanism Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Vertical Loading ◽  
Total Displacement ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
Real Scale

The finite element analysis model was built as the real scale for mortar arch framework slope protection, and the displacement and strain at different points were collected by vertical loading pressure. So the mechanical mechanism can be studied, and the analysis was done between calculation results and testing results of solid miniature model. The studying results show that the point on the arch foot is the worst stress place for each arch, and the total displacement increase nonlinear as the distance from the slope top increases, and the bump phenomenon exists in the bottom of slope, the points are likely to be broken.

Design and Comprehensive Performance Analysis of IS-LEJ Hinges

2018 ◽  
Author(s):  
Yanlin Li ◽  
Lifang Qiu ◽  
Jinglin Wang ◽  
Zhongtian Xie
Keyword(s):  
Theoretical Formula ◽  
Performance Parameters ◽  
Design Requirement ◽  
Bending Properties ◽  
Element Analysis ◽  
Movement Performance ◽  
The Finite Element Analysis ◽  
Comprehensive Performance ◽  
Calculation Results ◽  
Tension And Compression

The lamina emergent torsional (LET) joint is one of the most important components in lamina emergent mechanisms (LEMs), which can play a key role in its movement performance. This paper summarizes the existing hinges and compares their performance. Based on this, eight new flexure hinges are designed and the finite element analysis (FEA) models are created. Their bending properties, tension and compression resistant properties are analyzed respectively. In order to achieve the preliminary judgment of flexible hinge properties, comprehensive performance parameters q1 and q2 are proposed. The comprehensive performance of the eight hinges is compared according to the calculation results of q1 and q2. The theoretical formula of hinge with best performance is deduced and verified. Finally, the effect of length on the comprehensive performance of the eight hinges are analyzed. The result shows that the structure meets the design requirement of lifting comprehensive performance of hinges.

The Finite Element Analysis and Optimization of Subway Steel Structure Work Platform Based on Workbench and Pro/E in a Subway

2012 ◽  
Vol 538-541 ◽  
pp. 2953-2956
Author(s):  
Ya Li ◽  
Guang Sheng Ren
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Characteristics ◽  
Steel Structure ◽  
Strength Analysis ◽  
Element Analysis ◽  
Maximum Deformation ◽  
Software Model ◽  
The Finite Element Analysis ◽  
Calculation Results

The static and stability analysis of steel structure were taken according to steel structure work platform’s requirements and structural characteristics in a subway parking space by using the software model which is established by Pro/E software and implanted into the finite element analysis software ANSYS Workbench. The maximum deformation and stress in design load of the steel structure were calculated and the linear stress strength analysis of the key parts was carried out, also both the analysis and testing of the supporting pillar’s stability were performed. The results show that the structure model established by Pro/E and the calculation method are reasonable. Moreover, the calculation results are of high accuracy. The profile size is properly chosen and the structure bearing capacity and deformation meet the design requirements.

Nonlinear Analysis of Reinforced Concrete Beam by ANSYS

2013 ◽  
Vol 438-439 ◽  
pp. 663-666
Author(s):  
Xin Zhong Zhang ◽  
Lei Lei Liu ◽  
Ke Dong Tang
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Analysis ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Experimental Results ◽  
Analysis Software ◽  
Element Analysis ◽  
Ansys Analysis ◽  
The Finite Element Analysis ◽  
Calculation Results

This paper mainly uses ANSYS, the finite element analysis software, to make nonlinear analysis of reinforced concrete beam. The model simulating the test process was established, the calculation results of ANSYS are compared with the experimental results. The comparison shows that ANSYS analysis results are similar to experimental results, which indicates ANSYS analysis software can be used to simulate the mechanical property of reinforced concrete structures.

The Design and Calculation of 500 Kv Transmission Line RPC Double Pole Based on the ANSYS

2014 ◽  
Vol 986-987 ◽  
pp. 971-974
Author(s):  
Long Shi Wang ◽  
Xu Li ◽  
Xiao Bing Song
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Double Pole ◽  
Analysis Software ◽  
Great Strength ◽  
Element Analysis ◽  
Ansys Analysis ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
Reactive Powder

Reactive Powder Concrete (RPC) material has good performances such as great strength, good durability and good stability,Therefore it has higher application value.In this paper, We design and calculate theoretically for the transmission lines of RPC door type double pole , and use the finite element analysis software ANSYS analysis the RPC double pole. Then we compare the results of numerical calculation we have get with the theoretical calculation results .It turned out that the RPC pole in the 500 kv transmission line designed application is feasible.

Effect of Radius of Curvature on Seismic Response of Curved Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1261-1265 ◽  
Author(s):  
Bo Wang ◽  
Yu Xiang Liu
Keyword(s):  
Seismic Response ◽  
Numerical Models ◽  
Response Spectrum ◽  
Radius Of Curvature ◽  
Element Analysis ◽  
Curved Bridge ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
Girder Bridge ◽  
Main Girder

A four span curved HcontinuousH HboxH-girder bridge is used as an engineering example to investigate the effect of radius of curvature on the seismic response of curved bridge. Numerical models with different radii of curvature are created using the finite element analysis program Midas/Civil. The calculation results obtained from response spectrum method show that radius of curvature is an important parameter to curved bridge. When the radius of curvature is large enough, the relationship between seismic response of main girder and radius is approximately linearity, while nonlinear variation is obtained when theradius is not too large. Finally, conclusions are made that seismic design of Hstraight bridgeH unHfoldHed from curved bridge which radius of curvature is specified could Hsatisfy the engineering Hrequirement.

Collision Response of Bridge Girder with Shearkeys Subjected to Seismic Loads

2011 ◽  
Vol 90-93 ◽  
pp. 1539-1542
Author(s):  
Bo Wang ◽  
Yu Xiang Liu
Keyword(s):  
Seismic Loads ◽  
Analysis Program ◽  
Collision System ◽  
Element Analysis ◽  
Motion Feature ◽  
Rubber Bearing ◽  
Collision Response ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
Bridge Girder

In return for the collision response of bridge girder with shearkey subjected to seismic loads, a simplified dynamic model has been built by using the finite element analysis program Ansys/Ls-dyna. Based on the analysis of calculation results, the motion feature of this model is unfolded. Also, the stress response and characteristic at the bottom of shearkeys are analyzed, which are the most important parameters reflecting the cracking of shearkeys. Furthermore, the deformation of rubber bearing is elaborated to illustrate the collision of bridge girder with shearkeys. Finally, other key properties about the bridge girder of this collision system are addressed.

The Structure Design and Numerical Simulation of Internal Flow Field with High Efficiency Low Resistance Cyclone

2014 ◽  
Vol 1046 ◽  
pp. 209-212
Author(s):  
Liang Li
Keyword(s):  
Flow Field ◽  
Gas Flow ◽  
High Efficiency ◽  
Internal Flow ◽  
Structure Design ◽  
Field Calculation ◽  
Element Analysis ◽  
Low Resistance ◽  
Calculation Results ◽  
Field Velocity

Introduces the structure and main characteristics of high efficiency low resistance cyclone dust removal, the use of fluid finite element analysis software for the internal flow field is simulated. It can be concluded that gas flow in the cyclone separator, pressure field, velocity field, such as distribution, and on the basis of the flow field calculation results for the structure design about analyzed and discussed.

scholarly journals Analysis on mechanical characteristics of brake wheel and brake shoe of elevator traction machine

2021 ◽  
Vol 2125 (1) ◽  
pp. 012046
Author(s):  
Tao Jiang ◽  
Ziwei Wang ◽  
Zhaolin Ren ◽  
Guangjun Liu ◽  
Facai Ren
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Characteristics ◽  
Element Analysis ◽  
Brake Shoe ◽  
Emergency Braking ◽  
The Finite Element Analysis ◽  
Calculation Results ◽  
The Moment ◽  
The Impact

Abstract This paper analyzes the change of brake torque during normal stop and emergency braking of elevator. Taking the permanent magnet synchronous elevator traction machine as an example, the mechanical characteristics of the brake wheel and brake shoe on the brake under emergency braking are analyzed. According to the finite element analysis and calculation results, the impact and stress of the elevator are the largest at the moment of emergency braking, reaching 270.3MPa, and the strain increases gradually. The analysis results can provide reference for the design and verification of brake wheel and brake shoe of elevator traction machine.

scholarly journals Simulation of Temperature Effects on Concrete Residual Strength of the Slab-Column Connections

2019 ◽  
Vol 2 (4) ◽  
pp. 15 ◽  
Author(s):  
Wenchen Ma
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Good Accuracy ◽  
Column Height ◽  
Loading Capacity ◽  
Element Analysis ◽  
Plate Structures ◽  
Nonlinear Part ◽  
The Finite Element Analysis ◽  
Very High

Finite element simulations were conducted to explore the effects of high temperatures on the loading capacity of slab-column connection for the concrete flat-plate structures by the finite element analysis software ABAQUS. The structure used for the simulation is a slab which thickness is 150 mm with a 300 mm square column in the middle of slab, the column height is 450mm. The size of this slab is the same as experiments conducted by previous paper [1]. Based on the results of simulation, the punching capacity of this structure not experienced high temperature can be predicted with very good accuracy. But the result from simulations underestimated the loading capacity of the this structure after it has been cooled by around 10%. This phenomenon is a little bit conflicts with the known experimental results, however, it can be adjusted by modify the material parameters built-in the software. This article is focus on how to best simulate the concrete behavior for both linear and nonlinear part under the room temperature and cooling after experience a very high temperature.

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