新型高效水雾喷洒车喷洒系统设计与研究

为有效改善城市路面近空区域空气质量,该文基于水雾除尘理论和新形势下国家对环境净化新要求。通过对传统喷洒装置进行优劣势分析,并以降低城市路面近空区域固体颗粒物含量为目标,重点解决了新型高效水雾喷洒车喷洒系统的总体结构设计、管路系统设计和作业动作执行表设计等问题。实验结果表明,该新型水雾喷洒系统在城市路面近空区域空气质量净化方面,具有可降低近路面区域空气中固体颗粒物含量和避免喷洒作业时弄脏行人及车辆等显著优势,为后续同类产品的开发与设计提供了一定技术支持。     

全自动抑尘剂喷洒系统的研制

研制了铁路运煤车全自动抑尘剂喷洒系统,向车厢内的煤层表面均匀喷洒一层抑尘剂,极大降低了煤炭运输过程中的煤损耗问题。喷洒系统根据运煤车的型号、运行速度自动调节喷管高度及喷洒速度,并控制喷嘴滚筒旋转以防止抑尘剂喷洒到车厢连接空档处,并克服了车厢前部喷洒不足而尾部过量喷洒的问题,降低了抑尘剂喷洒成本,减少了操作人员。该系统已成功应用于实际生产中,运行状况表明:该系统喷洒效果稳定可靠,操作方便,具有良好的推广价值。     

一种新型农药喷洒机的原理与设计

介绍一种新型农业生产机械的原理与设计方案。运用直流电机和普通蓄电池作为动力源,利用多个机械离合器分别驱动行进机构、搅拌机构和喷洒机构。该产品用于解决农药喷洒过程中能耗高、效率低下、人机不隔离等问题,实现了喷药过程的安全性、无害化、高效率操作。     

一种多功能绿化养护装置的设计

多功能绿化养护装置以电动四轮小车为平台,由杂草清理机构、草坪修剪机构、绿篱修剪机构、农药喷洒机构等部分组成。可实现杂草及低矮灌木丛清理、草坪修剪、绿篱造型修剪、自动配比农药并自动喷洒等功能。控制系统以ATmega16单片机为主控芯片,搭载外围电路可实现该装置的简便、灵敏操控,同时该装置具有人工驾驶和无线遥控两种操作模式。该装置的模块化设计丰富了绿化养护装置的功能,可在一定条件下提高绿化养护工作效率、降低作业时产生的噪音,因此具有一定的应用价值。     

分布式层压机控制系统的设计与实现

结合太阳电池组件的封装层压工艺过程,研制出一种与太阳能电池组件封装新工艺相适合的分布式控制系统.该控制系统通过工控机实现全自动化的工艺过程监控,以适应太阳能电池组件的封装作业.该系统操作简单方便,运行稳定可靠.     

运煤车智能全自动防冻液喷洒系统

详细介绍了智能全自动防冻液喷洒系统的设计理念、组成结构、功能、优越性和应用情况.该系统能向车箱内的煤中均匀喷洒防冻液,解决了冬季运煤冻车问题.系统根据气温变化自动调节防冻液喷洒量,车头和车箱间空档经过喷洒区时停止喷洒,节约了防冻液,减少了操作人员.     

可移动双喷头喷雾系统植保无人机研究

针对市场上植保无人机存在农药喷洒量单一,喷洒范围小,适用农作物单一,喷洒效率低,经济成本高等问题,设计出可移动双喷头喷雾系统。该套喷雾系统包括可喷施不同雾化程度药液的多个喷头。此设计的有益效果为:通过设置可喷施不同雾化程度药液的喷洒系统,满足不同类别的农作物对于农药的雾化需求、相同类别的农作物在不同生长周期对农药的雾化需求,以及不同种植密度的农作物对农药的雾化需求。确保药物喷施的针对性,目的性明确,喷施效率高效,同时也意味着植保无人机在不同环境下作业的适应性强。一架植保无人机可以解决过去多架植保无人机合力解决的问题,生产成本降低的同时,也显著降低了企业或个人的经济负担。     

移动式高压气源喷射器研制

为了在狭窄空间实现核污染去污液的高效喷洒作业,通过对移动式高压气源喷射器的工作原理分析、关键部件选型、结构优化设计、功能性样机加工,研制出了适用于核污染去污液喷洒作业喷射器。移动式高压气源喷射器具有结构紧凑、作业稳定性高、无废气、无污染、噪声低、操作方便等优点。通过对喷射器喷嘴的雾化特性分析,得出喷射器工作时雾化效果良好的气液比,并在该气液比条件下,通过实验对喷射器喷洒范围和均匀性进行了检测,现场试验结果表明:该喷射器能够在狭小空间有效用于核污染去污液喷洒作业,具有较高实用价值。     

基于大数据处理的精准喷洒系统设计

基于现代农业高效,环保的要求,无人机大面积喷洒已成为农业植保的重点发展方向.为解决植保机大面积粗放喷洒作业中施药不精准、不环保,现设计基于大数据处理的精准喷洒系统.根据光谱和雷达系统获取实时数据,经过计算机对数据分块处理后,由两级调节喷洒系统进行喷洒农药.     

102G气相色谱仪的改进

102G气相色谱仪是上海分析仪器厂的早期产品,价格便宜,操作方便,比较适合中小型工厂用于生产中间控制分析.但用于农药成品生产控制分析则有欠缺之处.农药分析常需要较高的柱温、汽化温度和氢焰温度,而该色谱仪的汽化室及其分析系统又都是不锈钢材质,因此农药在其中极易产生分解,使分析结果偏离     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.