In this paper,consensus seeking of second-order systems without leaders is investigated under possibly switching directed graphs.Two consensus algorithms using different cooperative schemes are proposed and some infor...In this paper,consensus seeking of second-order systems without leaders is investigated under possibly switching directed graphs.Two consensus algorithms using different cooperative schemes are proposed and some information topology-independent criteria are obtained.For the first one,an eigenvalue-based analysis is taken to attain a sufficient and necessary condition for consensus seeking under fixed directed graph.For the second one,consensus can be achieved as long as the union of the switching graphs has a directed spanning tree frequently enough.Convergence analysis is presented,which is facilitated by an equivalent model transformation into a cascaded system.A novel sufficient and necessary condition for consensus seeking under switching undirected graph is also obtained using the same strategy.Moreover,robustness of both the algorithms to time-delays is studied under fixed directed graph.Illustrative examples are also provided to show the effectiveness of the theoretical results.展开更多
Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good dem...Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good demodulation effects. As carrier is not needed in this system, the frequency range of input signal is diminished so as to decrease the sampling frequency of accelerometer. This makes for the system on programmable chip(SOPC) design of digital demodulating system. The upper limit of accelerometer working frequency can reach 3 500 Hz. But affected by the inherent frequency of sensitive components, its working frequency is 10 Hz^1 000 Hz, and the sensitivity is 8.718 0 V/(m·s-2). This accelerometer can detect the dynamic range of acceleration signal real-timely, steadily and accurately, solving the dissymmetrical problem of light path caused by circumstances and the complexity of process.展开更多
机动车保有量增加引发的环境污染与交通拥堵日趋严重,人们对于缓解交通拥堵的交通流预测方法研究逐渐重视.本文对厦门市城市道路的RFID(Radio frequency identification)数据预处理后进行相似性分析,选取相似性系数和不稳定系数为指标...机动车保有量增加引发的环境污染与交通拥堵日趋严重,人们对于缓解交通拥堵的交通流预测方法研究逐渐重视.本文对厦门市城市道路的RFID(Radio frequency identification)数据预处理后进行相似性分析,选取相似性系数和不稳定系数为指标来表征路段交通流的相似度,并判断阈值以及对应交通状态下的路段交通转移量,最终以数据相似性为基础,建立交通流预测模型.选取10条城市道路RFID数据验证,其平均绝对误差为0.061,证明本文提出模型的可行性.展开更多
基金Supported by National Natural Science Foundation of China(60904051)Royal Academy of Engineering-Research Exchanges with China and India Awards
文摘In this paper,consensus seeking of second-order systems without leaders is investigated under possibly switching directed graphs.Two consensus algorithms using different cooperative schemes are proposed and some information topology-independent criteria are obtained.For the first one,an eigenvalue-based analysis is taken to attain a sufficient and necessary condition for consensus seeking under fixed directed graph.For the second one,consensus can be achieved as long as the union of the switching graphs has a directed spanning tree frequently enough.Convergence analysis is presented,which is facilitated by an equivalent model transformation into a cascaded system.A novel sufficient and necessary condition for consensus seeking under switching undirected graph is also obtained using the same strategy.Moreover,robustness of both the algorithms to time-delays is studied under fixed directed graph.Illustrative examples are also provided to show the effectiveness of the theoretical results.
基金Supported by National Natural Science Foundation of China(60904051)the Innovative Team Program of the National Natural Science Foundation of China(61021002)the Royal Academy of Engineering-Research Exchanges with China and India Awards
文摘Without adding feedback to modulate light path system, the dissymmetrical 3×3 coupled optical accelerometer reduces the complexity of the design of light path system. Experiments prove that it can attain good demodulation effects. As carrier is not needed in this system, the frequency range of input signal is diminished so as to decrease the sampling frequency of accelerometer. This makes for the system on programmable chip(SOPC) design of digital demodulating system. The upper limit of accelerometer working frequency can reach 3 500 Hz. But affected by the inherent frequency of sensitive components, its working frequency is 10 Hz^1 000 Hz, and the sensitivity is 8.718 0 V/(m·s-2). This accelerometer can detect the dynamic range of acceleration signal real-timely, steadily and accurately, solving the dissymmetrical problem of light path caused by circumstances and the complexity of process.
文摘机动车保有量增加引发的环境污染与交通拥堵日趋严重,人们对于缓解交通拥堵的交通流预测方法研究逐渐重视.本文对厦门市城市道路的RFID(Radio frequency identification)数据预处理后进行相似性分析,选取相似性系数和不稳定系数为指标来表征路段交通流的相似度,并判断阈值以及对应交通状态下的路段交通转移量,最终以数据相似性为基础,建立交通流预测模型.选取10条城市道路RFID数据验证,其平均绝对误差为0.061,证明本文提出模型的可行性.
