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discharge rate consistency of each channel for UAV-based pneumatic granular fertilizer spreader

International Journal of Agricultural and Biological Engineering 2023年第4期16卷 20-28页

作者： Xunwei Wang Rui Jiang Zhiyan Zhou Cancan Song Xiwen Luo Ruifeng Bao Zichen Lyu Junhao Huang Jianqin Lin College of Engineering South China Agricultural University and Guangdong Laboratory for Lingnan Modern AgricultureGuangzhou 510642China Guangdong Provincial Key Laboratory of Agricultural Artificial Intelligence(GDKL-AAI) Guangzhou 510642China Guangdong Engineering Research Center for Agricultural Aviation Application(ERCAAA) Guangzhou 510642China Key Laboratory of Key Technology on Agricultural Machine and Equipment(South China Agricultural University) Ministry of EducationGuangzhou 510642China College of Agricultural Engineering and Food Science Shandong University of TechnologyZibo 255000China

Unmanned aerial vehicles(UAVs)are widely being used to spread granular fertilizer in *** fertilizer spreaders equipped with UAVs are mainly centrifugal disc-type and *** multichannel pneumatic granular fertilizer spreaders(MPGFSs)have a banded fertilizer deposition distribution pattern,which are more suitable for variable rate fertilization with high precision requirement than the circular deposition distribution pattern of disc-type granular fertilizer spreaders(DGFSs).However,the existing MPGFS has the disadvantage of inconsistent discharge rate of each channel,which affects the uniformity of *** order to explore the causes of inconsistent discharge rate of each channel,the discrete element method(DEM)and bench test were performed to analysis the discharge process of the fluted roller fertilizing apparatus and distribution of fertilizer in axial direction of fluted *** computational fluid dynamics(CFD)was used to simulate the airflow field of pneumatic system to analyze the influence of airflow on the movement of fertilizer *** simulation results of the discharge process of the fluted roller fertilizing apparatus showed that the filling velocity at the axial ends of the fluted roller fertilizing apparatus was lower than that of the *** reason was that the filling capacity was weak near the *** simulated results of the airflow field without partitions showed that the airflow provided by the axial flow fan was rotational,and this caused the particles to move irregularly in the throat,resulting in inconsistency discharge rate of each *** on the analysis of reasons of inconsistent discharge rate of each channel,a MPGFS with partitions in the throat was *** discharge rate bench tests were carried out to optimize the partition spacing parameters,and fertilization test was performed to test the performance of the improved *** discharge rate test results showed better consistency with

关键词： UAV discharge rate fertilizer spreader DEM CFD

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Battery Voltage discharge rate Prediction and Video Content Adaptation in Mobile Devices on 3G Access Networks

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ZTE Communications 2013年第1期11卷 44-50页

作者： Is-Haka Mkwawa Lingfen Sun School of Computing and Mathematics University of PlymouthPlymouthPL4 8AAUK

According to Cisco, mobile multimedia services now account for more than half the total amount of Internet traffic. This trend is burdening mobile devices in terms of power consumption, and as a result, more effort is needed to devise a range of pow- er-saving techniques. While most power-saving techniques are based on sleep scheduling of network interfaces, little has been done to devise multimedia content adaptation techniques. In this paper, we propose a multiple linear regression model that predicts the battery voltage discharge rate for several video send bit rates in a VoIP application. The battery voltage dis- charge rate needs to be accurately estimated in order to esti- mate battery life in critical VoIP contexts, such as emergency communication. In our proposed model, the range of video send bitrates is carefully chosen in order to maintain an acceptable VoIP quality of experience. From extensive profiling, the empir- ical resuhs show that the model effectively saves power and pro- longs real-time VoIP sessions when deployed in power-driven adaptation schemes.

关键词： QoE power mobile devices quality adaptation discharge rate

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Experimental investigation on the gravity driven discharge of cohesive particles from a silo with two outlets

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Particuology 2024年第6期89卷 11-21页

作者： Li Dai Zhulin Yuan Fengxian Fan Conghui Gu School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China

An experimental study on the gravity driven discharge of cohesive particles from a silo with two outlets was *** discharge behaviors under the conditions that a single outlet was open and two outlets were open were investigated by varying the moisture content of the particles and the filling height of the particles in the *** results show that the discharge rate of the cohesive particles increases gradually at the beginning,then almost keeps constant,and finally drops *** discharge rate in case of two openings is around 1.1–1.6 times that in case of a single *** filling height leads to lower discharge rate in case of a single opening but results in higher discharge rate in case of two ***,the avalanche dynamics in case of a single opening was examined,and the mixing behavior of the cohesive particles was *** is observed that the discharge flow is promoted by the avalanche phenomenon in the silo,generating a general trend that the normalized mass of discharge increases with the filling height at higher moisture *** case of a single opening,the transition from mass flow to funnel flow favors the particle mixing,resulting in an increasing mixing index as the moisture content *** general,a better performance of mixing can be achieved in case of a single opening compared with in case of two *** study provides vital information for fundamental understanding of the gravity driven discharge of cohesive particles from the silo with multiple outlets.

关键词： Cohesive particles Moisture content discharge rate Avalanche Mixing

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Discrete and continuum modeling of granular flow in silo discharge

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Particuology 2018年第1期16卷 127-138页

作者： Tian Tian Jinglin Su Jinhui Zhan Shujun Geng Guangwen Xu Xiaoxing Liu State Key Laboratory of Multi-Phase Complex System Institute of Process Engineering Chinese Academy of Science Beijing 100190 China University of Chinese Academy ofSdences Beijing 100049 China Sino-Danish Center for Education and Research Beijing 100190 China

Granular material discharge from a flat-bottomed silo has been simulated by using continuum modeling and a three-dimensional discrete-element method （DEM）. The predictive abilities of three commonly used frictional viscosity models （Schaeffer, S-S, and μ（I）） were evaluated by comparing them with the DEM data. The funnel-flow pattern （type C） and the semi-mass-flow pattern （type B） that was predicted by DEM simulations can be represented when the Schaeffer orμ（I） model is used, whereas the S-S model gives a consistent type-B flow pattern. All three models over-estimate the discharge rate compared with the DEM. The profiles of the solids volume fraction and the vertical velocity above the outlet show that the larger discharge rates given by the Schaeffer and μ（I） model result from an over-estimation of volume fraction, whereas the deviation in the S-S model stems from the failure to predict a solid vertical velocity and a volume fraction.

关键词： Silo Flow pattern discharge rate Discrete-element model Frictional viscosity model

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Analysis of the Thermal Behavior of a Lithium Cell Undergoing Thermal Runaway

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Fluid Dynamics & Materials Processing 2021年第5期17卷 887-898页

作者： Qifei Du Zhigang Fang National Demonstration Center for Experimental Engineering Training Education Tiangong UniversityTianjin300387China School of Automotive Engineering Wuhan University of TechnologyWuhanChina Hubei Key Laboratory of Advanced Technology of Automotive Components Wuhan University of TechnologyWuhanChina

This study examines the thermal runaway of a lithium ion battery caused by poor heat dissipation *** heat transfer process is analyzed on the basis of standard theoretical *** mist additives are considered as a tool to suppress the thermal runaway *** ensuing behaviour of the battery in terms of surface temperature and heat generation is analyzed for different charge and discharge *** is found that when the remaining charge is 100%,the heat generation rate of the battery is the lowest,and the surface temperature with a 2C charge rate is higher than that obtained for a 0.5C charge *** experimental results show that when the additive concentration is 20%NaCl,its ability to inhibit the thermal runaway is the strongest.

关键词： Lithium ion battery thermal runaway discharge rate heat generating rate water mist

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