针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble ...针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble Empirical Mode Decomposition with Adaptive Noise,CEEMDAN)将故障电弧电流分解为不同本征模态函数分量并对其提取多尺度模糊熵、时域、频域组合特征。最后设计秃鹰搜索-随机森林算法(Bald Eagle Search and Random Forest,BES-RF)进行电弧故障检测,结果表明:检测准确率达98.05%,相比传统分解方法与检测算法准确率提高3.5%、4.7%,验证该方法的有效性。展开更多
An RF-UCard system is a contactless smartcard system with multiple chip operating systems and multiple applications. A multi-card collision occurs when more than one card within the reader’s read field and thus lower...An RF-UCard system is a contactless smartcard system with multiple chip operating systems and multiple applications. A multi-card collision occurs when more than one card within the reader’s read field and thus lowers the efficiency of the system. This paper presents a novel and enhanced algorithm to solve the multi-card collision problems in an RF-UCard system. The algorithm was originally inspired from framed ALOHA-based anti-collision algorithms applied in RFID systems. To maximize the system efficiency, a synchronous dynamic adjusting (SDA) scheme that adjusts both the frame size in the reader and the response probability in cards is developed and evaluated. Based on some mathematical results derived from the Poisson process and the occupancy problem, the algorithm takes the estimated card quantity and the new arriving cards in the current read cycle into consideration to adjust the frame size for the next read cycle. Also it changes the card response probability according to the request commands sent from the reader. Simulation results show that SDA outperforms other ALOHA-based anti-collision algorithms applied in RFID systems.展开更多
文摘针对航空电缆电弧故障因特征隐蔽性和危害性强引发的飞行安全隐患等问题提出一种新型检测方法。首先参考行业标准模拟飞行环境搭建试验平台完成数据采集。再采用北方苍鹰算法优化自适应噪声完备集合经验模态分解方法(Complete Ensemble Empirical Mode Decomposition with Adaptive Noise,CEEMDAN)将故障电弧电流分解为不同本征模态函数分量并对其提取多尺度模糊熵、时域、频域组合特征。最后设计秃鹰搜索-随机森林算法(Bald Eagle Search and Random Forest,BES-RF)进行电弧故障检测,结果表明:检测准确率达98.05%,相比传统分解方法与检测算法准确率提高3.5%、4.7%,验证该方法的有效性。
文摘An RF-UCard system is a contactless smartcard system with multiple chip operating systems and multiple applications. A multi-card collision occurs when more than one card within the reader’s read field and thus lowers the efficiency of the system. This paper presents a novel and enhanced algorithm to solve the multi-card collision problems in an RF-UCard system. The algorithm was originally inspired from framed ALOHA-based anti-collision algorithms applied in RFID systems. To maximize the system efficiency, a synchronous dynamic adjusting (SDA) scheme that adjusts both the frame size in the reader and the response probability in cards is developed and evaluated. Based on some mathematical results derived from the Poisson process and the occupancy problem, the algorithm takes the estimated card quantity and the new arriving cards in the current read cycle into consideration to adjust the frame size for the next read cycle. Also it changes the card response probability according to the request commands sent from the reader. Simulation results show that SDA outperforms other ALOHA-based anti-collision algorithms applied in RFID systems.
