共查询到19条相似文献,搜索用时 156 毫秒
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《邢台职业技术学院学报》2015,(3):79-82
本文介绍了马铃薯收获机的类型及特点,简述了国内外马铃薯收获机械的研究状况,分析了我国马铃薯收获机械发展中存在的主要问题,提出了发展对策及建议,为我国马铃薯收获机械的研究与发展提供参考。 相似文献
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王柄根 《阅读与作文(高中版)》2011,(2):45
以农牧机械研究、生产为主业的新疆机械研究院股份有限公司(下称:新研股份代码300159)即将登陆资本市场。新研股份主要产品包括系列玉米收获机械、青贮饲草料收获机械、动力旋转耙等,已形成了农牧业收获机械、耕作机械和农副产品加工及林果机械三大类产品。 相似文献
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为了便于监测甘蔗农田的土壤水分含量,利用无线传感器网络Zigbee技术,设计了一套甘蔗土壤水分远程监测系统.本系统由上位机程序、汇聚节点、路由节点和采集节点四部分组成.利用采集节点上的土壤水分传感器FDR-100实时采集农田信息,通过上位机管理软件储存和显示甘蔗农田中的土壤水分数据,为研究甘蔗的需水规律和甘蔗农田灌溉提供了重要的数据依据.经测试表明本监测系统具有安装简便、测量精度高等优点. 相似文献
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甘凤祝 《读与写:教育教学刊》2015,(2)
当前我国甘蔗生产的机械化水平很低,主要是由于甘蔗联合收割机研发技术水平低,无法解决实际生产中遇到的技术难题,限制了甘蔗生产的发展,本文分析了现有的甘蔗联合收割机存在的技术难题,并提出新的设计思路和技术措施。 相似文献
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汪超 《武汉工程职业技术学院学报》2012,(2):81
在湖北省第五届大学生机械创新设计大赛中,我院机电工程系学生参赛的"自动避雨晒衣架"和"甘蔗榨汁机"两项作品因设计巧妙、制作精巧、使用方便、答辩精彩,博得评委好评。其中"自动避雨晒衣架"名列第23位荣获一等奖,另一作品"甘蔗榨汁机"荣获二等奖。 相似文献
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徐善伟 《历史教学(高校版)》1998,(10)
甘蔗的原产地是印度或东南亚,也有人认为中国的南方也是甘蔗的重要原产地,而制糖术应当是印度人的发明,尔后传到世界其他地区.关于印度制糖术向中国的传播,季羡林先生已作了出色的研究,本文则主要论述甘蔗种植及制糖技术的西传. 相似文献
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HU Ying-chun LI Shang-ping 《重庆大学学报(英文版)》2007,6(3):187-191
A three-dimensional model of the uplift device of a sugarcane harvester was built up in Pro/Engineer. Simulation and evaluation of its motional and dynamic performance were performed with the automatic dynamic analysis of mechanical system (ADAMS). ANSYS program was applied to the structural analysis of the model. A finite element analytic model was built up with the bottom-up methodology and was meshed. The default Block Lanczos method was used to work out the native frequency. The results indicate that the five lower modes-the transpotaion wheel, the left holding device, the right holding device, the left cutter disk, and the right cutter disk- and displacement of vibratory type only slightly affect the process of sugarcane harvester and harvesting quality. So it is advisable that the optimization of the static intensity other than the dynamic stiffness of uplift device be executed. 相似文献
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对履带式小型甘蔗收割机断尾机构前置的形式进行了物流仿真和布局分析,通过物流仿真确定了耙轮、输送辊、喂入辊、剥叶装置、输出辊的相对合理位置,通过驾驶室和发动机的不同位置对比,分析了不同重心位置情况下的履带式小型甘蔗收割机的各种倾翻角.为整机的整体设计做了一定的前期准备工作. 相似文献
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研究目的:对一种两自由度的压电-电磁复合能量收集器进行发电性能研究。创新要点:建立了一种两自由度压电-电磁复合能量收集器发电性能的数学模型,该数学模型可以评估两自由度压电-电磁复合能量收集器中压电元件、电磁元件以及系统总输出功率。研究方法:对一种两自由度的压电-电磁复合能量收集器进行数学建模,并实验验证数学模型的正确性。基于实验测试得到的系统参数值,理论研究压电元件和电磁元件的机电耦合系数对不同能量收集器发电性能的影响关系,并对几种能量收集器的发电能力进行对比分析。重要结论:对于非强耦合(弱或中间耦合)的两自由度机电转换器,复合能量收集器(压电+电磁)具有比单一能量收集器(压电或电磁)更高的发电能力。 相似文献
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结合花生收获机捡拾装置特点及存在的问题,设计了一种牵引型分段式花生收获机自动捡拾装置,并详细地介绍了该装置的结构和工作原理。 相似文献
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This paper presents a type of vibration energy harvester combining a piezoelectric cantilever and a single degree of freedom (SDOF) elastic system. The main function of the additional SDOF elastic system is to magnify vibration displacement of the piezoelectric cantilever to improve the power output. A mathematical model of the energy harvester is developed based on Hamilton??s principle and Rayleigh-Ritz method. Furthermore, the effects of the structural parameters of the SDOF elastic system on the electromechanical outputs of the energy harvester are analyzed numerically. The accuracy of the output performance in the numerical solution is identified from the finite element method (FEM). A good agreement is found between the numerical results and FEM results. The results show that the power output can be increased and the frequency bandwidth can be improved when the SDOF elastic system has a larger lumped mass and a smaller damping ratio. The numerical results also indicate that a matching load resistance under the short circuit resonance condition can obtain a higher current output, and so is more suitable for application to the piezoelectric energy harvester. 相似文献
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A new energy harvester using a piezoelectric and suspension electromagnetic mechanism 总被引:1,自引:0,他引:1
This study presents a new design of a piezoelectric-electromagnetic energy harvester to enlarge the frequency bandwidth and obtain a larger energy output. This harvester consists of a primary piezoelectric energy harvesting device, in which a suspension electromagnetic component is added. A coupling mathematical model of the two independent energy harvesting techniques was established. Numerical results show that the piezoelectric-electromagnetic energy harvester has three times the bandwidth and higher power output in comparison with the corresponding stand-alone, single harvesting mode devices. The finite element models of the piezoelectric and electromagnetic systems were developed, respectively. A finite element analysis was performed. Experiments were carried out to verify the validity of the numerical simulation and the finite element results. It shows that the power output and the peak frequency obtained from the numerical analysis and the finite element simulation are in good agreement with the experimental results. This study provides a promising method to broaden the frequency bandwidth and in- crease the energy harvesting power output for energy harvesters. 相似文献
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为适应浙江省田块和地形条件,采用联合收割机总体设计原则,设计中、小型联合收割机,对4LZ-1.0型全喂入轴流式收获机的割幅、作业速度、生产率、功率、比压等主要参数进行分析和计算确定。 相似文献
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魏胜 《深圳职业技术学院学报》2012,11(3):7-12
研究了双层压电悬臂梁的工作原理及其有效机电耦合系数,借助ANSYS软件并选用Solid5(压电材料),Solid45(中间金属层),Circu94(电阻)3种元素类型建立压电换能器的有限元模型,通过谐振仿真分别求出压电装置的短路和开路谐振频率,得到其有效机电耦合系数.仿真结果表明,压电装置的有效机电耦合系数要小于压电材料的耦合系数,且与理论计算结果基本一致,仿真方法可有效地评价压电换能器的工作性能,并为后续实验提供理论指导. 相似文献