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刘军,谢守勇,陈翀,谢丹,杨明金.硬件在环秸秆切割仿真试验平台初步设计[J].农业工程学报,2018,34(19):46-53.DOI:10.11975/j.issn.1002-6819.2018.19.006
硬件在环秸秆切割仿真试验平台初步设计
投稿时间:2018-03-27  修订日期:2018-04-16
中文关键词:  农业机械  设计  仿真  秸秆  硬件在环
基金项目:“十三五”国家重点研发计划智能农业装备专项“农田提质工程技术和装备研发”(2017YFD0701100);重庆市科委社会事业和民生保障科技创新专项重点研发计划(cstc2017shms-zdyfx0006);重庆市重点产业共性关键技术创新专项项目(cstc2015zdcy-ztzx8002)
作者单位
刘军 1.西南大学工程技术学院重庆 400715 2.丘陵山区农业装备重庆市重点实验室重庆 400715 
谢守勇 1.西南大学工程技术学院重庆 400715 2.丘陵山区农业装备重庆市重点实验室重庆 400715 
陈翀 1.西南大学工程技术学院重庆 400715 
谢丹 1.西南大学工程技术学院重庆 400715 
杨明金 1.西南大学工程技术学院重庆 400715 2.丘陵山区农业装备重庆市重点实验室重庆 400715 
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中文摘要:为在实验室条件下,仿真模拟收获机械在田间工作的收割和行进工作环境,该文基于硬件在环技术搭建了秸秆类切割仿真及试验平台,提出一种螺旋绞龙供料系统,实现了物料的连续供给,并利用离散单元法对其进行物料的碰撞、运动方向及箱内分布仿真分析,根据仿真结果优化了螺旋绞龙供料系统结构并验证了设计的合理性和可行性。根据车辆行进道路模拟试验理论,设计了一种模拟收获机械田间行走的振动台,采用PLC编程软件Gxworks2、触摸屏编程软件SKWorkshopV5.0.2和组态软件kingview6.60SP1进行上位机编程,利用加速度、转矩传感器及上位机仿真模拟,检测和给定试验过程中所需的控制与反馈信号。试验结果表明:当螺旋绞龙转速维持在450~500?r/min范围内且保持振动台振动频率为4.12 Hz时,割刀输出平均转矩近似为田间收获秸秆时的输出转矩,即割刀实际工作情况接近田间收获机械工况。该研究可以为收获机械设计提供试验参考数据,为农业机械模拟可靠性测试标准制定提供技术参考。
Liu Jun,Xie Shouyong,Chen Chong,Xie Dan,Yang Mingjin.Preliminary design of straw cutting simulation test platform based on hardware-in-loop[J].Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2018,34(19):46-53.DOI:10.11975/j.issn.1002-6819.2018.19.006
Preliminary design of straw cutting simulation test platform based on hardware-in-loop
Author NameAffiliation
Liu Jun 1. School of Engineering and Technology, Southwest University Chongqing 400715, China2. Chongqing Key Laboratory of Agriculture Equipment for Hilly and Mountainous Regions, Chongqing 400715, China 
Xie Shouyong 1. School of Engineering and Technology, Southwest University Chongqing 400715, China2. Chongqing Key Laboratory of Agriculture Equipment for Hilly and Mountainous Regions, Chongqing 400715, China 
Chen Chong 1. School of Engineering and Technology, Southwest University Chongqing 400715, China 
Xie Dan 1. School of Engineering and Technology, Southwest University Chongqing 400715, China 
Yang Mingjin 1. School of Engineering and Technology, Southwest University Chongqing 400715, China2. Chongqing Key Laboratory of Agriculture Equipment for Hilly and Mountainous Regions, Chongqing 400715, China 
Key words:agricultural machinery  design  simulation  straw  hardware -in- loop
Abstract: Straw cutting is an important process for harvesting machinery during harvest time, and the cutting performance directly determines the harvest efficiency and the maintenance cost of the machines. However, subject to the influences of the harvest time and the field terrain differences, some problems, such as nonrepeatability, poor data continuity, high difficulty, and low accuracy, exist when obtaining the cutting parameters of the harvesting machinery during experiments. Prior research has designed some experiment platforms to reduce such problems. However, these platforms require excessive consumption of the straw, and need to continuously add the experimental straw manually. This is difficult to verify the reliability of the harvesting machinery’s continuous working condition. Therefore, drawing upon these problems, an innovative spiral auger feeding system was proposed to achieve the continuous supply of materials, and a simulation analysis of material collision, movement direction and distribution inside the box was conducted using the discrete element method. Meantime, a simulation physical experimental platform was built up by combining the simulation vibration platform that simulates the field terrain differences and the vibration of the harvesting machinery and by using the hardware-in-the-loop technique. The simulation results revealed that: 1) Adding a fan-shaped blade in the bottom of the spiral auger could increase the load and perturbation area of the spiral, thus increasing the whirlpool intensity formed by materials and then facilitating the formation of continuous flow of materials. 2) The velocity of rod-shaped particles increased along with the increase in the rotation speed of the spiral auger. However, when the rotation speed of the spiral auger reaching 600 r/min, the velocity of rod-shaped particles increased sharply and unstably, which was the no-load high-speed operation situation and was inconsistent with the actual cutting process of the harvesting machinery. When the rotation speed of the spiral auger lowering 300r/min, the velocity of rod-shaped particles has not yet reached the running velocity of the harvesting machinery, which was the low-speed turning operation condition. As a result, for ideal straw feeding system, the rotation speed of the spiral auger should keep during 400-500 r/min in order to marching the harvesting machinery’s actual operation status in the field. Following these simulation results, the structure of the proposed spiral auger feeding system was optimized, and the rationality and feasibility of the design idea was also verified. In addition, according to the general vehicle traveling process simulation theory, a shaking table that simulates the walking of the harvesting machinery in the field was designed. The PLC programming software Gxworks2, the touch screen programming software SKWorkshopV5.0.2 and the configuration software kingview6.60SP1 were used for upper computer programming, and to detect and give the control and feedback signals required during the experiment. The results showed that when the speed of the spiral auger reaching 450-500 r/min and the vibration frequency of vibration table keeping 4.12?Hz, the average output torque was approximate to the actual output torque of the straw harvest in the field. That is, the working condition of the cutter was close to the real working environment of the harvesting machinery. This research can provide experimental data for the harvesting machinery design, and can also provide technical support for the current lack of agricultural machinery simulation reliability testing standards.
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