液压支架立柱压力预测是回采工艺决策的重要依据,也是确保围岩稳定的基础信息之一。然而,液压支架立柱压力虽然具有一定的规律性,却无法用简单的数学模型进行预测;且在回采过程中,支架不接顶、顶板破碎、传感器检测误差等带来大量的随机噪声,使得压力数据劣化为非平稳时间序列,给压力的预测带来的很大的困难。本文在Transformer基础上,提出一种差分非平稳Transformer模型,在Transformer的编码器和解码器中分别引入差分归一化和反归一化操作,以提升序列的平稳性。同时,在Transformer中采用去平稳注意力机制,计算序列元素之间的关联关系,以增强模型的预测能力。在真实的煤矿支架立柱数据集上的对比实验表明,本文提出的差分非平稳Transformer的预测效果达到0.674,表现明显优于LSTM、Transformer和非平稳Transformer模型。

本文内容主要包括应用单片机构成的心电信号的采集系统和心电图QRS波检测及心率测定、分析系统。硬件设计采用胸部双导联输入，用89C51作为处理器，包括模拟和数字两部分。软件设计采用差分阈值算法来检测QRS波并测得心率，该算法以斜率和幅度为基础。

A new type of differential double-stator swing hydraulic motor,based on double stator structure,was introduced.Compared with the traditional swing hydraulic motors,it could provide various kinds of rotational speeds and torques under the same conditions of input flow rate and pressure.The operating principle and graphic symbols were described.The output speed and torque characters in multifarious connection modes were analyzed through single-acting differential double-stator swing hydraulic multi-motors.Then the differential connection modes and differential principles of differential double-stator swing hydraulic multi-motors were stated.Furthermore,the output speed and torque characters of doubleacting and triple-acting ones in multifarious connection modes were gotten.The interaction between output torque and the displacement ratio was studied.Finally,the internal leakage that influenced the volumetric efficiency was researched.The theoretical and experimental researches show that t...