Influence and analysis of structure design and optimization on the performance of a pit drip irrigation emitter *

2020 ◽  
Vol 69 (4) ◽  
pp. 633-645
Author(s):  
Tianyu Xu ◽  
Lixiang Zhang
Keyword(s):  
Drip Irrigation ◽  
Structure Design ◽  
Design And Optimization ◽  
Drip Irrigation Emitter

Analysis of Thermal Properties of Power Multifinger HEMT Devices

2018 ◽  
Author(s):  
Aleš Chvála ◽  
Robert Szobolovszký ◽  
Jaroslav Kováč ◽  
Martin Florovič ◽  
Juraj Marek ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Thermal Management ◽  
High Electron Mobility Transistor ◽  
Structure Design ◽  
High Electron ◽  
Design And Optimization ◽  
Chip Temperature ◽  
Materials Used ◽  
On Chip ◽  
Measurement Approach

In this paper, several methods suitable for real time on-chip temperature measurements of power AlGaN/GaN based high-electron mobility transistor (HEMT) grown on SiC substrate are presented. The measurement of temperature distribution on HEMT surface using Raman spectroscopy is presented. We have deployed a temperature measurement approach utilizing electrical I-V characteristics of the neighboring Schottky diode under different dissipated power of the transistor heat source. These methods are verified by measurements with micro thermistors. The results show that these methods have a potential for HEMT analysis in thermal management. The features and limitations of the proposed methods are discussed. The thermal parameters of materials used in the device are extracted from temperature distribution in the structure with the support of 3-D device thermal simulation. The thermal analysis of the multifinger power HEMT is performed. The effects of the structure design and fabrication processes from semiconductor layers, metallization, and packaging up to cooling solutions are investigated. The analysis of thermal behavior can help during design and optimization of power HEMT.

Strength Analysis of Parallel Grooved Drum

2013 ◽  
Vol 387 ◽  
pp. 115-119
Author(s):  
Qing Zhang ◽  
Kun Zhao ◽  
Ying Yue Xiao ◽  
Xian Rong Qin ◽  
Yuan Tao Sun ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Wall Thickness ◽  
Structure Design ◽  
Strength Analysis ◽  
Design And Optimization ◽  
Simulation Results

Only the basic wall thickness of drum is taken under consideration in traditional parallel grooved drum strength analysis, which is quite conservative for ignoring the thickness of the groove. So in this paper, it is aimed at comparing the strength simulation results for two drum models with and without the thickness of the groove and analyzing the stress distribution of the drum structure, which provides reference for the structure design and optimization of the drum.

scholarly journals Modeling the future of irrigation: A parametric description of pressure compensating drip irrigation emitter performance

PLoS ONE ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. e0175241 ◽  
Author(s):  
Pulkit Shamshery ◽  
Ruo-Qian Wang ◽  
Davis V. Tran ◽  
Amos G. Winter V
Keyword(s):  
Drip Irrigation ◽  
The Future ◽  
Parametric Description ◽  
Drip Irrigation Emitter

Structure design and optimization of high heat load absorbers in SSRF front-end

2016 ◽  
Vol 24 (7) ◽  
pp. 1640-1646 ◽  
Author(s):  
李勇军 LI Yong-jun ◽  
张 敏 ZHANG Min ◽  
薛 松 XUE Song ◽  
贾丹丹 JIA Dan-dan ◽  
金利民 JIN Li-min
Keyword(s):  
Heat Load ◽  
High Heat ◽  
Structure Design ◽  
Design And Optimization ◽  
Front End ◽  
High Heat Load

Natural Ventilation Design and Optimization of Large-Scale Industrial Workshop

2014 ◽  
Vol 1065-1069 ◽  
pp. 2137-2140
Author(s):  
Xiao Hu Yang ◽  
Yan Long ◽  
Ling Zhao Meng ◽  
Yu Hui Jin
Keyword(s):  
Large Scale ◽  
Natural Ventilation ◽  
Thermal Environment ◽  
Orthogonal Experiment ◽  
Structure Design ◽  
Iron And Steel ◽  
Design And Optimization ◽  
Experiment Method ◽  
Orthogonal Experiment Method ◽  
Computational Fluid Dynamics Cfd

In this paper, we used orthogonal experiment method and Computational Fluid Dynamics (CFD) technology to simulate the thermal environment of the iron and steel workshop. By comparing and analyzing the temperature distribution and air flow of workshops with different window structures, we obtained an optimization of natural ventilation design for industrial workshop. The research results can be used for the structure design or reformation of industrial workshops as reference.

Research for the Resonator Structure Process Technology of Resonant Pressure Sensors

2014 ◽  
Vol 609-610 ◽  
pp. 1020-1022
Author(s):  
Zheng Yuan Zhang ◽  
Yang Cao ◽  
Yong Mei ◽  
Jian Gen Li ◽  
Zhi Cheng Feng
Keyword(s):  
Surface Roughness ◽  
High Precision ◽  
Silicon Substrate ◽  
Pressure Sensors ◽  
Structure Design ◽  
Process Technology ◽  
Design And Optimization ◽  
Resonator Structure ◽  
Etch Stop ◽  
Koh Etching

The fabrication of butterfly-shape resonator is key for high precision resonator, for requiring suspend on the silicon substrate. This paper is focused on the technology of making butterfly-shape resonator. the variety of structure design can be used to make butterfly-shape resonator have been analyzed, the structure of butterfly-shape resonator is obtained, and for reducing the etch surface roughness, KOH etching conditions, such as composition, concentration, and temperature of etch solution, have been done. Combining with above testing results, the structure design and optimization KOH etching technology are obtained ,based on the technology, using the boron etch stop technique , the silicon butterfly-shape resonator has been done, it can be used effectively in the fabrication of the silicon resonant sensor.

Numerical Calculation of Triangle Circulation Drip Irrigation Emitters

2010 ◽  
Author(s):  
Xinkun Wang ◽  
Junhong Li
Keyword(s):  
Flow Rate ◽  
Drip Irrigation ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Structure Design ◽  
Flow Channel ◽  
Channel Structure ◽  
Sudden Expansion ◽  
Flow Index ◽  
Circulation Flow

Based on the hydraulic characteristics of triangle circulation, sudden-expansion pipe and sudden contraction pipe, Construct a drip irrigation emitter with strong turbulent flow, large over-current cross-section and strong anti-clogging ability. Triangular circulation flow path emitters for the key structural parameters for the factors, application of computer numerical fluid dynamics CFD software FLUENT6.3, simulate triangular circulation flow channel structure, analyze the influence of various structural parameters on hydraulic performance of emitters, flow index, flow rate and the anti-clogging ability. The results show that increase unit cusp, unit chamfer, the flow index increased, but the effect to varying degrees; inlet dimension increase, flow index reduced; flow channel depth and flow channel width increases, the discharge increases. Increase unit cusp, unit chamfered, can improve the anti-clogging performance of emitters. Based on the above results, to design an emitter structure with good performance, and its numerical simulation analysis, the flow index, flow rate and anti-clogging ability have met the requirements of drip irrigation. Provide a theoretical basis for the triangle circulation emitter structure design and quantitative analysis. The research has a positive meaning for energy conservation.

Investigation of Dynamic Photoelasticity Based on a Three-Dimensional Model

2011 ◽  
Vol 83 ◽  
pp. 261-266
Author(s):  
Bin Li ◽  
Guo Biao Yang ◽  
Fan Ni ◽  
Qi Rong Zhu
Keyword(s):  
Boundary Conditions ◽  
High Speed ◽  
Three Dimensional ◽  
Green Laser ◽  
Structure Design ◽  
Dynamic Photoelasticity ◽  
Three Dimensional Model ◽  
Design And Optimization ◽  
True Value ◽  
Dimensional Models

Dynamic photoelasticity has been widely utilized to investigate the phenomena generated by impact loading. The dynamic parameters of structures, such as propagation of stress wave and stress concentration, are obtained through this method, which provide guidelines for structure design and optimization. In the previous studies, two-dimensional models are wildly used by researchers. In these models, the inaccuracy of the boundary conditions leads to error amplification during the conversion of the tested results into real ones. In this study of dynamic photoelasticity, three-dimensional models are used. An improved digital dynamic photoelastic system is also adopted to calculate elastic wave propagation in the medium, where the diode-pumped solid-state green laser and high-speed CCD are used as light source luminaries and recording system respectively. Based on these models, where the boundary conditions approach to true value, the resulting data are higher in resolution than is possible with other experimental techniques. This method has been adopted and tested successfully by generating better results with less amplification of errors.

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