A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defec...A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects.展开更多
Circularly polarized microstrip antenna is frequently realized by cutting the slot inside the patch and feeding it along the diagonal axis. In the reported literature, procedure to design them at any given frequency i...Circularly polarized microstrip antenna is frequently realized by cutting the slot inside the patch and feeding it along the diagonal axis. In the reported literature, procedure to design them at any given frequency is not available. In proposed work, circularly polarized slot cut circular microstrip antenna at 900 MHz is discussed. By studying the surface current distributions at two orthogonal modes, formulations in their resonant length are proposed. The frequencies calculated using them closely agree with simulated results. Using proposed formulation, procedure to design circular polarized antennas at different frequencies is presented that gives circular polarized response. Thus, proposed work will be helpful to design similar circular polarized circular microstrip antenna at any desired frequency.展开更多
为预估和延长双圆弧谐波减速器刚轮插齿刀有效长度,论文建立了双圆弧刚轮齿廓数学模型,根据运动学法,建立了插刀加工数学仿真模型;根据齿廓法线法,建立了砂轮磨削加工数学模型,推导了刃磨后插刀的等效齿形与加工误差,确定了插刀的有效...为预估和延长双圆弧谐波减速器刚轮插齿刀有效长度,论文建立了双圆弧刚轮齿廓数学模型,根据运动学法,建立了插刀加工数学仿真模型;根据齿廓法线法,建立了砂轮磨削加工数学模型,推导了刃磨后插刀的等效齿形与加工误差,确定了插刀的有效长度。在此基础上,论文通过优化砂轮齿形与插刀齿数,延长了插刀有效长度。结果表明:优化前55齿插刀有效长度为2.1 mm, 0截面插刀加工出刚轮齿形误差为2μm;优化后0截面插刀加工出刚轮齿形误差的最大值为0.14μm。优化后插刀齿数越多,插刀有效长度越长;优化后42齿、55齿、68插刀有效长度分别增加了4.8%、52%、81%。展开更多
为提高射频识别(Radio frequency identification,RFID)标签的识别效率,本文针对RFID动态帧时隙ALOHA防冲突系统,提出了新的标签估计方法和帧长确定方案.标签估计中采用了不同的贝叶斯代价函数,提出了几种贝叶斯标签估计方法,它们的估...为提高射频识别(Radio frequency identification,RFID)标签的识别效率,本文针对RFID动态帧时隙ALOHA防冲突系统,提出了新的标签估计方法和帧长确定方案.标签估计中采用了不同的贝叶斯代价函数,提出了几种贝叶斯标签估计方法,它们的估计结果准确,而且通过减小标签数取值范围可使计算复杂度得到降低.随后,推导出一种根据标签数确定最优帧长的方案,它能使系统达到最大的信道利用率,该最大信道利用率要大于帧的时隙数等于标签数时所能达到的最大利用率.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grant No.50001006,50305017)China Postdoctoral Science Foundation.
文摘A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects.
文摘Circularly polarized microstrip antenna is frequently realized by cutting the slot inside the patch and feeding it along the diagonal axis. In the reported literature, procedure to design them at any given frequency is not available. In proposed work, circularly polarized slot cut circular microstrip antenna at 900 MHz is discussed. By studying the surface current distributions at two orthogonal modes, formulations in their resonant length are proposed. The frequencies calculated using them closely agree with simulated results. Using proposed formulation, procedure to design circular polarized antennas at different frequencies is presented that gives circular polarized response. Thus, proposed work will be helpful to design similar circular polarized circular microstrip antenna at any desired frequency.
文摘为预估和延长双圆弧谐波减速器刚轮插齿刀有效长度,论文建立了双圆弧刚轮齿廓数学模型,根据运动学法,建立了插刀加工数学仿真模型;根据齿廓法线法,建立了砂轮磨削加工数学模型,推导了刃磨后插刀的等效齿形与加工误差,确定了插刀的有效长度。在此基础上,论文通过优化砂轮齿形与插刀齿数,延长了插刀有效长度。结果表明:优化前55齿插刀有效长度为2.1 mm, 0截面插刀加工出刚轮齿形误差为2μm;优化后0截面插刀加工出刚轮齿形误差的最大值为0.14μm。优化后插刀齿数越多,插刀有效长度越长;优化后42齿、55齿、68插刀有效长度分别增加了4.8%、52%、81%。
文摘为提高射频识别(Radio frequency identification,RFID)标签的识别效率,本文针对RFID动态帧时隙ALOHA防冲突系统,提出了新的标签估计方法和帧长确定方案.标签估计中采用了不同的贝叶斯代价函数,提出了几种贝叶斯标签估计方法,它们的估计结果准确,而且通过减小标签数取值范围可使计算复杂度得到降低.随后,推导出一种根据标签数确定最优帧长的方案,它能使系统达到最大的信道利用率,该最大信道利用率要大于帧的时隙数等于标签数时所能达到的最大利用率.
