| 苜蓿调制试验台测控系统设计与试验 |
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| 引用本文： | 宋占华,邢书仑,王征,田富洋,王锋德,李法德.苜蓿调制试验台测控系统设计与试验[J].农业机械学报,2021,52(2):122-134. |
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| 作者姓名： | 宋占华 邢书仑 王征 田富洋 王锋德 李法德 |
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| 作者单位： | 山东农业大学；山东省园艺机械与装备重点实验室;中国农业机械化科学研究院 |
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| 基金项目： | 国家重点研发计划项目（2016YFD0701701) |
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| 摘 要： | 为研究调制辊工作参数对苜蓿调制性能的影响,在已有苜蓿调制试验台的基础上,利用LabVIEW软件设计了一套试验台测控系统。该测控系统主要由电动机控制系统、数据采集系统、调制辊间隙调节系统和上位机系统4部分组成,实现了调制辊转速在350~1350 r/min之间的连续可调和调制辊间隙在2~4 mm之间的精确控制,数据采样速率最高可达1 kHz,并在测控系统显示界面上实时显示与保存试验台工作过程中固定辊与传动轴之间的扭矩和转速曲线、电动机功率曲线以及浮动辊轴承座与间隙调节液压缸之间的压力曲线。利用配备测控系统的试验台,以紫花苜蓿为试验对象,采用Box-Behnken试验设计方法进行了三因素三水平响应面试验,结果表明,该测控系统能够实现试验台精确控制与数据实时精准采集。分别建立了单位能耗、苜蓿压扁率和压扁损失率与试验因素的二次回归模型,得到了试验条件下调制工作参数的最优解分别为:调制辊转速775 r/min、调制辊间隙3.3 mm、调制辊单位工作长度喂入量2.77 kg/(m·s);同时,得到了苜蓿调制试验目标值的最优解分别为:单位能耗909.25 J/kg、苜蓿压扁率96.67%、压扁损失率1.67%。利用紫花苜蓿进行了验证试验,结果表明,在最优工作参数组合条件下,单位能耗、苜蓿压扁率、压扁损失率分别为931.42 J/kg、94.33%、1.65%,与模型优化值的相对误差均小于3%。该测控系统为苜蓿的调制试验提供了可靠的技术支撑,也为苜蓿调制机构的设计及工作参数的选择提供了数据参考和理论依据。
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| 关 键 词： | 苜蓿 调制 测控系统 单位能耗 响应面试验 |
| 收稿时间： | 2020/10/3 0:00:00 |
Design and Experiment of Measurement and Control System for Alfalfa Conditioning Test Bench |
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| SONG Zhanhu,XING Shulun,WANG Zheng,TIAN Fuyang,WANG Fengde,LI Fade.Design and Experiment of Measurement and Control System for Alfalfa Conditioning Test Bench[J].Transactions of the Chinese Society of Agricultural Machinery,2021,52(2):122-134. |
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| Authors: | SONG Zhanhu XING Shulun WANG Zheng TIAN Fuyang WANG Fengde LI Fade |
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| Institution: | (College of Mechanical and Electronic Engineering,Shandong Agricultural University,Taian 271018,China;Shandong Key Laboratory of Horticultural Machinery and Equipment,Taian 271018,China;Shandong Engineering Laboratory of Agricultural Equipment Intelligence,Taian 271018,China;Chinese Academy of Agricultural Mechanization Sciences,Beijing 100083,China) |
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| Abstract: | In order to study the influence of various factors on the alfalfa conditioning performance,a set of the measurement and control system for alfalfa conditioning test bench was built with the LabVIEW software on the basis of the existing alfalfa conditioning test bench.The measurement and control system was mainly composed of four parts,including a motor control and monitoring system,a data acquisition system,a conditioning gap regulating system and a PC system.By the measurement and control system with the data acquisition frequency of 1 kHz,the conditioning rotate speed can be adjusted continuously in the range from 350 r/min to 1350 r/min,and the conditioning gap between both rubber rollers can be controlled accurately between 2 mm and 4 mm.The curves,such as the torque and the speed of the fixed roller,the power of the motor,the pressure of the hydraulic cylinder used for regulating the gap between the rollers,were displayed and saved in real time on the front panel of the measurement and control system.A three-factor three-level response surface test with the Box-Behnken test method was carried out using alfalfa with the alfalfa conditioning test bench equipped with a measurement and control system.The results showed that the measurement and control system could achieve precise control of the alfalfa conditioning test bench and real-time accurate data collection.By the analysis of the test data,the quadratic regression models of the unit energy consumption,the alfalfa flattening rate and the flattening loss rate were established,respectively,the optimal solution of the working parameters of the alfalfa conditioning test bench were achieved,that was,the rotate speed of the conditioning rollers was 775 r/min,and the gap of conditioning rollers was 3.3 mm,and the feeding rate of the per unit working length of the conditioning rollers was 2.77 kg/(m·s).Meanwhile,the optimal solutions of the conditioning qualities of alfalfa under the optimal working parameters conditions were achieved,respectively,that was,the unit energy consumption was 909.25 J/kg,the flattening rate of alfalfa was 96.67%,and the flattening loss rate was 1.67%.The working parameters of the alfalfa conditioning test bench were set as the optimal solution parameters of the models listed above,the confirmation tests with the alfalfa were carried out.The results showed that the measurement values of the conditioning quality parameters of the alfalfa under the optimal working parameters conditions were consistent with the optimization results,that was,the unit energy consumption,the flattening rate and the flattening loss rate of alfalfa were 931.42 J/kg,94.33%and 1.65%,respectively,and the relative errors between the solution optimization values of the models and the measured values of the confirmation tests were less than 3%.The results showed that the measurement and control system provided a reliable technical support for the alfalfa conditioning test,and provided a data reference and theoretical basis for the design of alfalfa conditioning mechanism and the selection of working parameters. |
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| Keywords: | alfalfa conditioning measurement and control system power consumption of unit mass response surface test |
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