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Simple decision-making model for orchard air-assisted spraying airflow

International Journal of Agricultural and Biological Engineering 2023年第2期16卷 23-29页

作者： Xiang Wang Yuru Feng Wei Fu Jiangtao Qi Jianli Song Center for Chemicals Application Technology(CCAT) College of ScienceChina Agricultural UniversityBeijing 100193China College of Mechanical and Electrical Engineering Hainan UniversityHaikou 570100China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130022China

Airflow speed is one of the three factors of air-assisted *** the matching model between airflow speed and target canopy characteristics is an effective way to improve the orchard precision spraying technology,as airflow can significantly affect droplet deposition and drift loss.A simple model of airflow speed was established in this ***,air-assisted spraying experiments were carried out on a standard simulation canopy to study the airflow speed depended on canopy width,leaf area index,and porosity ***,determined by Ribbon Method and verified by droplet drift data,the airflow speed through the canopy was between 0.5 m/s and 0.7 m/***,multiple tests were carried out under standard simulation canopy with different characteristics,and the airflow speed model was established ultimately:with a fixed leaf area index(LAI),the relationship between canopy upwind boundary airflow speed and canopy width satisfied the exponential model(y=ae^(bx)),and the coefficients a and b are well related to the density of branches and leaves in the *** LAI=3.456,y=2.036e^(1.5887x),R^(2)=0.994;LAI=1.728,y=1.639e^(1.445x),R^(2)=*** growers can acquire needed airflow speed through this simple model,it is quick and precise and appropriate to most growth periods of a variety of fruit trees,such as apples,pears,and vines.

关键词： airflow speed canopy width porosity rate LAI air-assisted spraying

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Macroscopic Frost Heave Model Based on Segregation Potential Theory

引用

Transactions of Tianjin University 2010年第4期16卷 304-308页

作者：吉植强徐学燕于琳琳 State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology School of Civil Engineering Harbin Institute of Technology

A macroscopic frost heave model with more clear parameters was established. Based on a porosity rate frost heave model and segregation potential theory, a porosity rate function was deduced and introduced into the stress-strain relationship. Numerical simulation was conducted and verified by frost heave tests. Results show that the porosity rate within the frozen fringe is proportional to the square of temperature gradient and current porosity, and is also proportional to the exponential function of applied pressure. The relative errors between the calculated and measured results of frost depth and frost heave are within 3% and 15% respectively, demonstrating that the temperature gradient, applied pressure and current porosity are the main influencing factors, while temperature is just the constraint of frozen fringe. The improved model have meaningful and accessible parameters, which can be used in engineering with good accuracy.

关键词： frost heave model porosity rate segregation potential frost heave test temperature gradient

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