针对锂电池剩余容量预测精度无法满足当前工程应用的问题,结合双向长短时记忆网络(bi-directional long short-term memory,BiLSTM)与滑动时间窗口(sliding time window,STW)算法的优点,提出一种电池剩余容量预测方法。首先分析BILSTM...针对锂电池剩余容量预测精度无法满足当前工程应用的问题,结合双向长短时记忆网络(bi-directional long short-term memory,BiLSTM)与滑动时间窗口(sliding time window,STW)算法的优点,提出一种电池剩余容量预测方法。首先分析BILSTM神经网络和STW算法原理,构建了BiLSTM-STW神经网络模型,采用自适应矩优化算法(adaptive moment estimation,Adam)对模型超参数进行优化,实现模型修正;然后选取美国国家航空航天局(National Aeronautics Space and Administration,NASA)埃姆斯研究中心锂电池数据,对数据进行处理并选取容量衰减特征数据作为神经网络的预测输入量;最后利用构建的神经网络对NASA锂电池数据集进行剩余容量预测实验。实验结果表明,所构建的神经网络模型能够精确预测锂电池的剩余容量,相比LSTM神经网络模型有更好的精确度。展开更多
Railway seat inventory control strategies play a crucial role in the growth of profit and train load factor. The railway passenger seat inventory control problem in China was addressed. Chinese passenger railway opera...Railway seat inventory control strategies play a crucial role in the growth of profit and train load factor. The railway passenger seat inventory control problem in China was addressed. Chinese passenger railway operation features and seat inventory control practice were analyzed firstly. A dynamic demand forecasting method was introduced to forecast the coming demand in a ticket booking period. By clustering, passengers' historical ticket bookings were used to forecast the demand to come in a ticket booking period with least squares support vector machine. Three seat inventory control methods: non-nested booking limits, nested booking limits and bid-price control, were modeled under a single-fare class. Different seat inventory control methods were compared with the same demand based on ticket booking data of Train T15 from Beijing West to Guangzhou. The result shows that the dynamic non-nested booking limits control method performs the best, which gives railway operators evidence to adjust the remaining capacity in a ticket booking period.展开更多
文摘针对锂电池剩余容量预测精度无法满足当前工程应用的问题,结合双向长短时记忆网络(bi-directional long short-term memory,BiLSTM)与滑动时间窗口(sliding time window,STW)算法的优点,提出一种电池剩余容量预测方法。首先分析BILSTM神经网络和STW算法原理,构建了BiLSTM-STW神经网络模型,采用自适应矩优化算法(adaptive moment estimation,Adam)对模型超参数进行优化,实现模型修正;然后选取美国国家航空航天局(National Aeronautics Space and Administration,NASA)埃姆斯研究中心锂电池数据,对数据进行处理并选取容量衰减特征数据作为神经网络的预测输入量;最后利用构建的神经网络对NASA锂电池数据集进行剩余容量预测实验。实验结果表明,所构建的神经网络模型能够精确预测锂电池的剩余容量,相比LSTM神经网络模型有更好的精确度。
基金Project(2009BAG12A10)supported by the State Technical Support Program of ChinaProject(71201009)supported by National Natural Science Foundation of ChinaProject(RCS2009ZT009)supported by the State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,China
文摘Railway seat inventory control strategies play a crucial role in the growth of profit and train load factor. The railway passenger seat inventory control problem in China was addressed. Chinese passenger railway operation features and seat inventory control practice were analyzed firstly. A dynamic demand forecasting method was introduced to forecast the coming demand in a ticket booking period. By clustering, passengers' historical ticket bookings were used to forecast the demand to come in a ticket booking period with least squares support vector machine. Three seat inventory control methods: non-nested booking limits, nested booking limits and bid-price control, were modeled under a single-fare class. Different seat inventory control methods were compared with the same demand based on ticket booking data of Train T15 from Beijing West to Guangzhou. The result shows that the dynamic non-nested booking limits control method performs the best, which gives railway operators evidence to adjust the remaining capacity in a ticket booking period.
