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Development and test of hydraulic driven remote transporter

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International Journal of Agricultural and Biological Engineering 2021年第2期14卷 72-80页

作者： Jiaxue Li Shanjun Li Yanlin Zhang Mingdi Liu Zhiyuan Gao College of Engineering Huazhong Agricultural UniversityWuhan 430070China Guangdong Polytechnic college Zhaoqing 526000GuangdongChina China Agriculture(Citrus)Research System Wuhan 430070China Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River Ministry of Agriculture and Rural AffairsWuhan 430070China Citrus Mechanization Research Base Ministry of Agriculture and Rural AffairsWuhan 430070China National R&D Center for Citrus Preservation Wuhan 430070China

To solve the problems of the traditional orchard conveyor,such as inflexible steering,a complex structure,poor stability and no power grid coverage,a remote-controlled rail conveyor powered by hydraulic pressure for mountainous orchards was designed and *** stress analysis was carried out on a full-load trailer to obtain the maximum traction force,which met the requirement of the climbing slope of the transport *** key components of the conveyor were developed,such as the hydraulic transmission,the control system,safety protection devices,limiting devices,the throttle and decompression actuator,the counterweight tension and the *** the theoretical calculations of key components,an orchard conveyor powered by diesel and hydraulic pressure was ***,the working performance of the transporter was tested through functionality,driving speed,system pressure and remote-controlled *** test results showed that the climbing angle of the transporter can reach 50°,the uphill load can reach 840 kg,the downhill load can reach 1100 kg,and the average running speed is 0.77 m/s;the driving speed ranges from 0.29 m/s to 1.08 m/s,and the system pressure ranges from 3.2 MPa to 10 *** driving speed and system pressure are significantly affected by the load,and the remote control distance can reach 455 *** technical specifications of the transporter meet all the design requirements,and the problem of stable operation of the transporter without power grid coverage has been *** research results can well meet the practical application requirements of mountain orchard transportation without power grid coverage and provide theoretical reference for the design of key components of mountain orchard transportation machinery.

关键词： mountain orchard conveyor hydraulic drive remote control

Systematic Synthesis for Multiple-Feedback Filter Using OTAs and CCCIIs

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Wuhan University Journal of Natural Sciences 2020年第1期25卷 71-77页

作者： LI Yongan CHEN Bo School of Information Engineering Shaanxi Institute of International Trade&CommerceXi’an 712046ShaanxiChina School of Physics and Electronic Engineering Xianyang Normal UniversityXianyang 712000ShaanxiChina

In order to obtain the multiple-feedback filter with simpler structure and electronic control,this paper first derives nodal admittance matrix(NAM)equation of the multiple-feedback ***,in accordance with the pathological models of the operational transconductance amplifier(OTA)and second generation current-controlled conveyor(CCCII),the multiplefeedback filter based on OTAs and CCCIIs are respectively synthesized by the NAM expansion *** filter employing three OTAs has eight equivalent realizations and the filter employing three CCCIIs has 16 equivalent realizations.24 different forms of the current-mode filters are synthesized in *** and Q of the synthesized filters can be tuned by tuning bias currents of the active *** hand analysis and computer analysis are included to support the method to be utilized.

关键词： current-mode filter current controlled conveyor operational transconductance amplifier(OAT) nodal admittance matrix expansion

Research on the soft start-up performance of hydro-viscous drive

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Journal of Coal Science & Engineering(China) 2004年第1期10卷 70-72页

作者：魏建华陈宁 State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China Zhejiang University of Science and Technology Hangzhou 310027 China

The principle and structure of hydro-viscous drive(HVD) set is introduced. Through theoretical analysis of the HVD set start-up steadiness, the conclusions were obtained that the non-linearity of the pressure performance curve and dynamic pressure instability of the pilot-operated electro-hydraulic pressure relief valve, which is used for the HVD speed regulating purpose and usually works within micro flow-rate and low oil pressure state, are the main causes of the poor start-up steadiness. So a special speed regulating valve for HVD set is developed, with which the start-up steadiness of HVD set is much improved.

关键词： soft start-up steadiness HVD special speed regulating valve oil film conveyor

Systematic Synthesis for Electronic-Control Colpitts Oscillator Using CCCIIs

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Wuhan University Journal of Natural Sciences 2019年第3期24卷 251-256页

作者： LI Yongan CHEN Bo School of Physics and Electronic Engineering Xianyang Normal University

By the aid of nullor-mirror models of the second-generation current-controlled conveyor(CCCII) and applying the nodal admittance matrix(NAM) expansion method, the family of current-mode Colpitts oscillators employing four CCCIIs and three grounded capacitors is synthesized. Thirty-two Colpitts oscillators using CCCIIs are obtained in all. By using canonical number of components, the circuits can be easily integrated and the oscillation criterion and the oscillation frequency can be independently and electronically tuned by tuning bias currents of the CCCIIs. The paper-and-pencil analysis and Pspice simulation results have been included to support the synthesis method.

关键词： Colpitts oscillator electronic control current-controlled conveyor nodal admittance matrix expansion

Studying the Law of the Movement of Cotton Particle on a Saw Cylinder and the Interaction with Saw Teeth

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Engineering（科研） 2019年第10期11卷 717-725页

作者： Jamoliddin Ergashev Khamid Akhmedhodjaev Abdusamat Karimov Juramirza Kayumov Rashida Ergasheva Shohruxmirzo Mahsudov Namangan Institute of Engineering and Technology Namangan Uzbekistan

This article investigates the movement trajectory of the cotton particle from Point D of belt transporter of the saw gin camera to Point B of the saw cylinder. In other words, the forces acting on the cotton particle and the equations of their interactions are developed, where, the differential equation of the law of movement of the cotton particle “belt + saw” is made according to the d’Alembert principle. Arc-BD of cotton particle gives the length of the arc of their fall on the saw teeth. The maximum separation of fibers and the quality of separation of fiber from seeds, as well as the time (t) of rapid separation of fiber from seeds, depend on the length of the arc-BD, because the critical length of the arc-BD makes it possible to reduce the multi-layering of the falling cotton particle on the saw teeth. In this scientific research work, patented by the new working camera of the saw gin, the trajectories of the movement of the cotton particles along the arc-DB, as well as the trajectory of the move in the direction of the grate are studied. The results of the study show that the number of fibers increases along the height of the teeth of the saw with one touch. This leads to a decrease in the average stay of seeds in the working chamber of the gin. As a result, the efficiency of the saw gin is increased.

关键词： Cotton Particle Belt conveyor Saw Cylinder Grate Cotton Seeds Cotton Fiber Net Surface

A New Voltage-Mode Universal Biquadratic Filter Using Single UVC

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Circuits and Systems 2017年第12期8卷 275-284页

作者： Kanhaiya Lal Pushkar Kavya Gupta Pinky Vivek Department of Electronics and Communication Engineering Maharaja Agrasen Institute of Technology Rohini New Delhi India Electronics and Communication Engineering Cell Radiance EdutechTM DDA Market Paschim Vihar Delhi India Department of Electronics and Communication Engineering Al-Falah University Faridabad India

The paper presents a new universal biquadratic filter using single universal voltage conveyor (UVC), two resistors and two capacitors. The offered structure has three inputs and one output and can realise all the five basic biquadratic filters: high-pass (HP), low-pass (LP), band-reject (BR), band-pass (BP) and all-pass (AP) from the same circuit topology. The proposed universal filter also provides following advantageous features, not available simultaneously in any UVC based universal biquadratic filter so far: (i) low active and passive sensitivities, (ii) independent control of natural frequency (ω0) and bandwidth (BW) and (iii) no requirement of any component matching condition and inversion of input signal(s) (as needed in most of the earlier reported structures). The workability of proposed structure has been presented by SPICE (Version 16.5) simulation using 0.18 μm TSMC technology.

关键词： Analog Circuit Universal Voltage conveyor Voltage-Mode Filters

The Study of the Movement of Cotton Particles and Mathematical Modeling of the Impact of It at the Ginning Point

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Engineering（科研） 2019年第11期11卷 768-776页

作者： Jamoliddin Ergashev Khamid Akhmedhodjaev Abdusamat Karimov Juramirza Kayumov Rashida Ergasheva Namangan Institute of Engineering and Technology Namangan Uzbekistan

This article studied the principles of movements in the horizontal part of the newly constructed ginning camera, which is created by the authors, of the cotton particles. During the movement, the cotton particles get affected by pressing to various surface and forceful turbulent and horizontal movements of the surface. Some foreign mixtures and additional unnecessary objects get separated by the turbulence of the various surfaces and movement of the paneled stripes. Ginning efficiency and the quality of the cotton will be improved as the defects of the cotton particles are removed. “Cotton particle + net surface” movement principle of the Cartesian coordinate system was examined based on the rows of Cartesian coordinate system, by dividing all sides of the system by m weight and has the following second ordered multiple gender differential formula.

关键词： Cotton Particle Ginning Process Ginning Camera Saw Cylinder Belt conveyor Plank

An Experimental Investigation on the Quasi-Static Flotation Transport of a Glass Substrate Using Vortex Bearing Elements

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Journal of Flow Control, Measurement & Visualization 2013年第1期1卷 6-12页

作者： Xin Li Yoshihiro Nakamura Mikio Horie Toshiharu Kagawa Department of Mechano-Micro Engineering Tokyo Institute of Technology Yokohama Japan Precision and Intelligence Laboratory Tokyo Institute of Technology Yokohama Japan

In this paper, we build an air conveyor with newly developed vortex bearing elements, and study the flotation precision of the front-end of the substrate in quasi-static flotation transport. We experimentally discuss the three influential factors: air supply pressure, thickness of the substrates and installing direction of the vortex bearing element. We find that during the process of transport the movement of the substrate leads to the variation of flotation height. The amplitude of variation (e.g. flotation precision) is dependent upon the bearing stiffness and the suction force of the vortex bearing elements. Increasing air supply pressure properly can improve the flotation precision, but an excess pressure can cause over-suction due to high negative pressure and result in a poor flotation precision. We also know that the flotation precision of thin and light substrates are easily affected by the suction force of vortex flow because they float with a high flotation height and are more susceptible to deformation. Finally, we investigate four installing directions of the vortex bearing element. Different installing direction can lead to different variation of flotation height.

关键词： Flotation Transport Air conveyor Vortex Bearing Element Vortex Flow Suction Force

THE DESIGN OF ACTIVE CURRENT-MODE FILTER WITH STATE VARIABLE METHOD

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Journal of Electronics(China) 2000年第4期17卷 376-381页

作者： Yuan Shiwen Jing Jun (Yanshan University, Qinhuangdao 066004, China)Yutaka Fukui(Tottori University, Koyama, Tottori, 680 Japan)

Basing on the state variable method, a block diagram of the current-mode biquad active circuit was proposed, whose integrators were realized using three kinds of active elements such as operational amplifier, second generation current conveyors and operational transconduc-tance amplifiers-electric capacity. The characteristics of each circuit were analyzed.

关键词： Current-mode filter Operational amplifier Operational transconductance amplifier Current conveyor