This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person t...This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person theorem. The splendid selection of switching manifold for each subsystem makes the design relatively straightforward and can be easily realized. An illustrate example is given.展开更多
This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utiliz...This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utilizing an engineering case from a gold mine in Dandong, China, a laboratory-based similar test is conducted to extract the actual roof characteristic curve. This test continues until the mining stope collapses due to a U-shaped failure. Concurrently, a semi-theoretical method for obtaining the roof characteristic curve is proposed and verified against the actual curve. The semi-theoretical method calculated that the support force and vertical displacement at the demarcation point between the elastic and plastic zones of the roof characteristic curve are 5.0 MPa and 8.20 mm, respectively, corroborating well with the laboratory-based similar test results of 0.22 MPa and 0.730 mm. The weakening factor for the plastic zone in the roof characteristic curve was semi-theoretically estimated to be 0.75. The intersection between the actual roof characteristic curve and the support characteristic curves of expandable props, natural pillars, and concrete props indicates that the expandable prop is the most effective “yielding support” for the stope roof in room-and-pillar mining. That is, the deformation and failure of the stope roof can be effectively controlled with proper release of roof stress. This study provides practical insights for optimizing support strategies in room-and-pillar mining, enhancing the safety and efficiency of mining operations.展开更多
大型复杂机电设备在航空航天、遥感测绘和智能制造行业的应用越来越广。针对复杂机电设备在仓储和运输过程中的状态信息实时测量问题,特别是测量过程中的复杂测量任务调度难题,提出了一种基于改进麻雀搜索算法(improving the sparrow se...大型复杂机电设备在航空航天、遥感测绘和智能制造行业的应用越来越广。针对复杂机电设备在仓储和运输过程中的状态信息实时测量问题,特别是测量过程中的复杂测量任务调度难题,提出了一种基于改进麻雀搜索算法(improving the sparrow search algorithm,ISSA)的复杂测量任务实时调度方法。该方法首先通过tent混沌映射并结合反向学习初始化麻雀种群,提升算法初始解质量;随后引入灰狼优化算法信息交换机制改进发现者搜索策略,提升算法全局搜索能力;最后将正余弦机制与跟随者位置更新相结合,并在迭代完成后对发现者个体进行变邻域搜索,提高调度算法收敛速度,防止算法陷入局部最优。为验证调度方法的综合调度性能,对其进行了大量对比实验分析。实验结果表明,该方法将系统调度算法的计算时间缩减了14.3%,最大完成时间也较传统方法优化了46.6%,充分验证了其在复杂测量任务调度中的有效性和稳定性。展开更多
文摘This paper, at the first time, considers the problem of decentralized variable structure control of complex giant singular uncertainty systems by using the property of diagonally dominant matrix and Frobenius-Person theorem. The splendid selection of switching manifold for each subsystem makes the design relatively straightforward and can be easily realized. An illustrate example is given.
基金Project(2022YFC2903801) supported by the National Key Research and Development Program of ChinaProjects(52374117, 52274115) supported by the National Natural Science Foundation of China。
文摘This study is to determine the support mechanism of pre-stressed expandable props for the stope roof in room- and-pillar mining, which is crucial for maintaining stability and preventing roof collapse in mines. Utilizing an engineering case from a gold mine in Dandong, China, a laboratory-based similar test is conducted to extract the actual roof characteristic curve. This test continues until the mining stope collapses due to a U-shaped failure. Concurrently, a semi-theoretical method for obtaining the roof characteristic curve is proposed and verified against the actual curve. The semi-theoretical method calculated that the support force and vertical displacement at the demarcation point between the elastic and plastic zones of the roof characteristic curve are 5.0 MPa and 8.20 mm, respectively, corroborating well with the laboratory-based similar test results of 0.22 MPa and 0.730 mm. The weakening factor for the plastic zone in the roof characteristic curve was semi-theoretically estimated to be 0.75. The intersection between the actual roof characteristic curve and the support characteristic curves of expandable props, natural pillars, and concrete props indicates that the expandable prop is the most effective “yielding support” for the stope roof in room-and-pillar mining. That is, the deformation and failure of the stope roof can be effectively controlled with proper release of roof stress. This study provides practical insights for optimizing support strategies in room-and-pillar mining, enhancing the safety and efficiency of mining operations.
文摘大型复杂机电设备在航空航天、遥感测绘和智能制造行业的应用越来越广。针对复杂机电设备在仓储和运输过程中的状态信息实时测量问题,特别是测量过程中的复杂测量任务调度难题,提出了一种基于改进麻雀搜索算法(improving the sparrow search algorithm,ISSA)的复杂测量任务实时调度方法。该方法首先通过tent混沌映射并结合反向学习初始化麻雀种群,提升算法初始解质量;随后引入灰狼优化算法信息交换机制改进发现者搜索策略,提升算法全局搜索能力;最后将正余弦机制与跟随者位置更新相结合,并在迭代完成后对发现者个体进行变邻域搜索,提高调度算法收敛速度,防止算法陷入局部最优。为验证调度方法的综合调度性能,对其进行了大量对比实验分析。实验结果表明,该方法将系统调度算法的计算时间缩减了14.3%,最大完成时间也较传统方法优化了46.6%,充分验证了其在复杂测量任务调度中的有效性和稳定性。
