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温室内轨道式喷灌装置设计
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作者 吴志东 潘迪 +1 位作者 冯宇琛 韩承津 《节水灌溉》 北大核心 2020年第6期91-96,共6页
为达到温室内灌溉节约用水的目的,设计可沿轨道运动的三自由度倒挂机械臂喷灌装置,同时,可保障作物生长在最佳湿度土壤中,以提高作物产量。本文提出一种基于势函数、电势场理论的土壤湿度传感器均匀性布点方法,可精确采集区域内土壤湿度... 为达到温室内灌溉节约用水的目的,设计可沿轨道运动的三自由度倒挂机械臂喷灌装置,同时,可保障作物生长在最佳湿度土壤中,以提高作物产量。本文提出一种基于势函数、电势场理论的土壤湿度传感器均匀性布点方法,可精确采集区域内土壤湿度;采用模糊控制更加精确地控制土壤湿度;为快速响应控制指令,采用PI方法对各关节电机进行控制。计算、分析及仿真结果表明:PI控制可使装置快速响应指令进行运动,响应时间小于1 s;传感器均匀布点方法与土壤湿度模糊控制方法相结合,可精确控制电磁阀开闭时间,模糊控制响应时间小于1 s。装置整体结构模型搭建完成,响应速度快,运动路径及动作可按设定执行。 展开更多
关键词 轨道式喷灌装置 传感器均匀性布点方法 倒挂式机械臂 模糊控制 势函数 电势场理论
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Magnetic-structure coupling dynamic model of a ferromagnetic plate parallel moving in air-gap magnetic field 被引量:1
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作者 Yuda Hu Tianxiao Cao Mengxue Xie 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第10期145-155,共11页
Aiming at the air-gap magnetic field excited by wall armatures,Laplace’s partial differential equation of air-gap magnetic potential is achieved by means of the electromagnetic field theory.According to the magnetic ... Aiming at the air-gap magnetic field excited by wall armatures,Laplace’s partial differential equation of air-gap magnetic potential is achieved by means of the electromagnetic field theory.According to the magnetic boundary conditions and the method of separation of variables,the magnetic potential of the air-gap magnetic field is obtained.Based on the magnetization force model and Lorentz force of ferromagnetic thin-walled structures,and introducing the electromagnetic constitutive relations and boundary conditions,the calculation model of electromagnetic force of the soft ferromagnetic thin plate moving in air-gap magnetic field is established.Considering geometric nonlinearity,expressions of strain energy and kinetic energy of the elastic thin plate and the work of forces are given,respectively.The magnetic-structure coupling nonlinear vibration equations of ferromagnetic thin plate parallel moving in the air-gap magnetic field excited by armatures are obtained by using the Hamilton principle,which can be of the characterization of the system dynamics model with electro-magneto-velocity-mechanical interaction.Through numerical examples,primary resonance characteristics of the strip thin plate under the action of air-gap magnetic force are obtained.The results show that the two stable amplitude values will increase as amplitude of magnetic potential increases and thickness of air-gap decreases,and the amplitude’s multi-valued region will change due to the varieties of magnetic potential,air-gap and velocity.The model established in this paper is a theoretical reference for investigation on the multi-field coupling dynamic behaviors of structures moving in complex electromagnetic fields. 展开更多
关键词 Ferromagnetic thin plate Magnetic-structure coupling dynamics Air-gap magnetic field In-plane motion Magnetic potential equation
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