When designing a solar power plant, it is much more important to avoid the shadow on the PV Panels. As the shadow falls on the PV Panels;it significantly reduces the generation of required power as planned and designe...When designing a solar power plant, it is much more important to avoid the shadow on the PV Panels. As the shadow falls on the PV Panels;it significantly reduces the generation of required power as planned and designed. This research paper and case study will help a lot to avoid shadow, especially when selecting inter-row spacing between the strings of solar power plants.展开更多
In view of the difficulties in weeding and plant protection in the middle and late period of maize planting,this paper proposed a self-propelled thermal fogger chassis.According to the theoretical calculation and agro...In view of the difficulties in weeding and plant protection in the middle and late period of maize planting,this paper proposed a self-propelled thermal fogger chassis.According to the theoretical calculation and agronomic requirements for maize planting,the structure and working principles of the self-propelled thermal fogger chassis were introduced.On this basis,the multi-body dynamics model of chassis structure was established,and the chassis traction,steering and obstacle surmounting performances were also analyzed.Then the rationality and the feasibility of the design were verified through the furrow running test and test equipped with thermal fogger.Test results showed that,the traction performance improves with the decrease of soil deformation index and increase of cohesion,and when track pre-tensioning force was about 1000 N,the machine had a good traction performance;with the decrease of the soil deformation index and the increase of cohesive force,the stability of the single side brake turn of the chassis becomes better;on the contrary,with the increase of the tightness of the crawler,the steering radius turns smaller and the steering stability becomes worse.Under heavy clay,with the pre-tensioning of 1000 N,the machine has better steering stability and smaller turning radius.The obstacle-surmounting simulation result shows that on sandy soil road,the maximum climbing angle for the chassis is 42°,the height of vertical obstacle crossing is 170 mm and the trench width is 440 mm.The study provides a reference for the design of plant protection machinery in the middle and late stages of maize planting.展开更多
针对传统郁闭果园空间狭小、枝干遮挡严重,现有割草机株间除草效率低,转场困难等问题,该研究设计了一种适用于丘陵山地的纯电驱动行间与株间避障除草机器人。基于果园作业环境与割草农艺需求,提出机器人总体结构方案,包括底盘驱动系统...针对传统郁闭果园空间狭小、枝干遮挡严重,现有割草机株间除草效率低,转场困难等问题,该研究设计了一种适用于丘陵山地的纯电驱动行间与株间避障除草机器人。基于果园作业环境与割草农艺需求,提出机器人总体结构方案,包括底盘驱动系统、电动推杆割草高度调节系统、转轴弹簧株间被动避障系统以及隔离型DCDC(direct current to direct current converter)高低压系统。为提高运动控制性能,设计了底盘驱动系统模糊PID控制器,并提出一种改进的麻雀搜索算法,融合混沌种群初始化、自适应动态步长及反向学习策略,优化模糊PID的量化因子与比例因子。仿真结果表明,ISSA-FuzzyPID(improved sparrow search algorithm-FuzzyPID)在阶跃信号下的稳态误差较SSA-FuzzyPID(sparrow search algorithm-FuzzyPID)和PID分别降低0.25、1.88 r/min,超调量分别减少6.19%和13.42%,表现出更高的鲁棒性。田间试验显示,机器人在满载除草作业下的平均速度为0.7811 m/s,平均转弯圆直径为984 mm,爬坡角度不低于16.8°,航向角偏差在±3°以内,行间平均除草率达91.97%,平均避障成功率为95.58%,割茬稳定性系数大于85%,割幅利用系数大于90%,各项作业指标均满足设计要求,能够有效实现果园行间与株间除草作业。研究结果可为丘陵山地郁闭果园除草机器人的设计与运动控制提供理论依据。展开更多
文摘When designing a solar power plant, it is much more important to avoid the shadow on the PV Panels. As the shadow falls on the PV Panels;it significantly reduces the generation of required power as planned and designed. This research paper and case study will help a lot to avoid shadow, especially when selecting inter-row spacing between the strings of solar power plants.
基金This research was financially supported by the Special Fund of Ministry of Agriculture of China for Public Welfare Projects(No.201503136)Natural Science Fund Project in Anhui Province(No.1708085ME135)Natural Science Major Project in Anhui Province(No.KJ2018ZD016).
文摘In view of the difficulties in weeding and plant protection in the middle and late period of maize planting,this paper proposed a self-propelled thermal fogger chassis.According to the theoretical calculation and agronomic requirements for maize planting,the structure and working principles of the self-propelled thermal fogger chassis were introduced.On this basis,the multi-body dynamics model of chassis structure was established,and the chassis traction,steering and obstacle surmounting performances were also analyzed.Then the rationality and the feasibility of the design were verified through the furrow running test and test equipped with thermal fogger.Test results showed that,the traction performance improves with the decrease of soil deformation index and increase of cohesion,and when track pre-tensioning force was about 1000 N,the machine had a good traction performance;with the decrease of the soil deformation index and the increase of cohesive force,the stability of the single side brake turn of the chassis becomes better;on the contrary,with the increase of the tightness of the crawler,the steering radius turns smaller and the steering stability becomes worse.Under heavy clay,with the pre-tensioning of 1000 N,the machine has better steering stability and smaller turning radius.The obstacle-surmounting simulation result shows that on sandy soil road,the maximum climbing angle for the chassis is 42°,the height of vertical obstacle crossing is 170 mm and the trench width is 440 mm.The study provides a reference for the design of plant protection machinery in the middle and late stages of maize planting.
文摘针对传统郁闭果园空间狭小、枝干遮挡严重,现有割草机株间除草效率低,转场困难等问题,该研究设计了一种适用于丘陵山地的纯电驱动行间与株间避障除草机器人。基于果园作业环境与割草农艺需求,提出机器人总体结构方案,包括底盘驱动系统、电动推杆割草高度调节系统、转轴弹簧株间被动避障系统以及隔离型DCDC(direct current to direct current converter)高低压系统。为提高运动控制性能,设计了底盘驱动系统模糊PID控制器,并提出一种改进的麻雀搜索算法,融合混沌种群初始化、自适应动态步长及反向学习策略,优化模糊PID的量化因子与比例因子。仿真结果表明,ISSA-FuzzyPID(improved sparrow search algorithm-FuzzyPID)在阶跃信号下的稳态误差较SSA-FuzzyPID(sparrow search algorithm-FuzzyPID)和PID分别降低0.25、1.88 r/min,超调量分别减少6.19%和13.42%,表现出更高的鲁棒性。田间试验显示,机器人在满载除草作业下的平均速度为0.7811 m/s,平均转弯圆直径为984 mm,爬坡角度不低于16.8°,航向角偏差在±3°以内,行间平均除草率达91.97%,平均避障成功率为95.58%,割茬稳定性系数大于85%,割幅利用系数大于90%,各项作业指标均满足设计要求,能够有效实现果园行间与株间除草作业。研究结果可为丘陵山地郁闭果园除草机器人的设计与运动控制提供理论依据。
