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Direction analysis on Contactless Power Transmission System 总被引：1，自引：0，他引：1
After analysis on the direction relationship betueen primary side and secondary side of existing contactless power transmission system, a random rotatable pick-up is proposed. Two connecting modes of three orthogonal wound coils are studied. Based on analysis and mathematical calculation, instantaneous output voltage and its ratio to the maximal and minimal value when the pick-up rotate in three-dimensional space is given. All the calculation is verified by experiment results. 相似文献
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土壤钾离子非接触电导检测装置设计与试验 总被引：1，自引：0，他引：1
为确保土壤钾离子检测的时效性和准确性,设计了非接触电导检测装置。首先,设计与毛细管配套的非接触式电导检测池,以金属圆筒结合导电银胶构建激励电极、屏蔽电极和接收电极。其次,构建非接触式电导检测器,包括激励信号发生电路、前置放大电路及检波放大电路,搭建了一个板级的激励信号发生电路,该电路采用考毕兹振荡器电路匹配高频变压器的方案。前置放大电路采用跨阻放大拓扑,检波放大电路将前置放大电路输出的毫伏级交流电压信号,通过整流、调零、程控放大,得到一个固定范围的直流电压,用于上位机采集。通过电导率的变化波形可以分析出土壤溶液中的钾离子含量。最后,采用设计的非接触式电导检测装置对6种标准土样的钾离子含量进行初步检测分析。结果表明,6种土壤样品的钾离子含量测试结果与标准值的趋势一致,说明此套非接触式电导检测装置能够完成土壤样品的初步检测,并与标准值存在相关关系。 相似文献
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When contactless power transmission (CPT) systems are operating normally, load variation will cause the system operating frequency to drift and the resonance frequency scope to deviate from the desired level. These fluctuations in turn cause the system to vary substantially and affect its normal operation. Considering the slip road track of the primary circuit and the phase angle change between the front of the sub network rectifier circuit current and the voltage, we employ different circuit models to analyze the nature and size of the load for the two types of anti perceptual situations. An algorithm is derived to calculate the junior circuit parameters with the load on the rails. Simulation analysis for the load identification under two different load conditions is conducted, and the expected results achieved. 相似文献
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基于图像的肉羊生长参数实时无接触监测方法 总被引：1，自引：1，他引：0
针对基于体尺、体质量的肉羊实时生长监测中体尺、体质量需要人工测量的不足,论文提出基于结构化限位装置及机器视觉技术的无接触肉羊生长参数测量方法,并讨论无接触方法获取的体尺数据与羊只生长特性的关系。首先,基于自主研发的无应激形态参数采集系统实时采集60只小尾寒羊的俯视图和侧视图,应用图像处理技术对所得到的图像进行分析,提取体高、臀高、体长、胸深、胸宽、臀宽3类6种体尺参数;无接触生长参数采集系统同时记录对应羊只的体质量。对无接触方法获取的体尺、体质量数据相关关系进行研究,并分别利用单因素线性回归、单因素非线性回归、多元线性回归、偏最小二乘回归、RBF网络拟合、SVM回归方法建立体尺与体质量关系模型。试验表明:体高、臀高、体长、胸深、胸宽、臀宽的最大相对误差分别为4.73%、2.55%、2.50%、3.95%、3.80%和2.90%;无接触方法获取的体高、体长、胸宽与体质量相关性大于0.8;在基于单因素的生长监测中可选择体长参数;多体尺能够较全面地表达羊只的生长状态,其中胸深、胸宽、体长是重要的监测参数;多因素非线性模型可以更全面、精准的体现羊只生长特性。论文提出的无接触方法可有效提升工作效率,节约50%的人工投入。同时,也可减少羊只的应激反应,是长期、实时监测羊只生长的实用方法,对推动精准、福利化养羊具有重要意义。 相似文献
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基于深度图像的猪体尺检测系统 总被引：9，自引：0，他引：9
为实现生猪饲养过程中体尺无接触检测,设计了一套基于双目视觉原理的猪体尺检测系统。针对色彩图像提取猪体轮廓易受污物和光照干扰的问题,提出基于深度图像的猪体轮廓提取算法。使用双目视觉系统获得猪体深度图像,利用帧差法提取猪只高度信息,并基于高度信息二值化图像,获得猪体轮廓;结合优化的基于凹陷结构的拐点提取算法,筛选体尺检测关键点,计算体长、体宽、体高、臀宽、臀高5个体尺,编写了基于以上算法的猪体尺检测程序。双目视觉系统三维检测的实验室验证表明:在2 m物距范围内,系统三维检测相对误差均小于1%;系统在实际猪场对32组猪体尺检测结果表明:与手工测量猪体尺相比,本系统检测的体尺平均相对误差在2%左右,平均误差小于2 cm。试验证明基于深度图像的猪体尺检测系统不容易受到脏污和光照干扰,能够实现生猪饲养过程中猪体尺的无接触检测。 相似文献
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A new type AC DC AC converter which can work in Buck or Boost mode is proposed in order to overcome the deficiencies of the primary circuit of the traditional contactless power transfer system. Through switching this two modes and turning the duty cycles of the switches, not only the resonant current amplitude of the primary resonant current can be controlled to be constant against a wide range variation of input voltage, but also the problems, such as surge current, high cost, complex control etc., caused by the DC filter and DC/DC converter in a traditional CPT system are effectively eliminated. The topology and operation principle of the proposed converter have been analyzed. The corresponding control strategy has been presented and verified by simulation results. 相似文献
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For the drawback of the power regulation in the existing current fed CPT system, a novel circuit topology and control method is presented, which can realize either Buck or Boost mode and can extend the power regulation scope. The improved topology is modeled, while the relations between the duty cycle and the output power for the two modes are derived for system analysis and design. Simulink and PLECS are used to simulate the PP type CPT system. The simulation results prove the theory analysis. 相似文献
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