鱼雷攻击中“潜艇占位射击可行域”分析

深入剖析了现行潜艇占位射击可行域的图示求解过程,探讨了该方法产生错误的症结所在;通过在该方法求解出的可行域中选择个别阵位点做例子,对其占位射击的不可行性予以分析说明;指出以该提法寻求到的区域事实上无法在选择假定阵位点之前先期确定。     

层次模糊评价法在码头前沿回旋水域方案比选中的运用

为解决码头前沿回旋水域方案比选的不确定性问题,将模糊层次分析法运用到对回旋水域方案比选评价中,采用层次分析法确定回旋水域方案各评价指标的权重,建立回旋水域方案比选的模糊综合评价模型,最终给出各方案的优劣顺序.以广东珠海LNG项目一期工程船舶靠离泊操纵回旋水域为例进行分析验证,其结果较为满意.     

PMSM用逆变器单环矢量调制策略

分析了目前永磁同步电机（PMSM）常用控制方法的优点与不足,结合正弦波脉宽调制（SPWM）技术与转子磁场定向控制（FOC）技术,提出了一种PMSM用逆变器的单闭环空间矢量调制（SL—SVPWM）方法。以PMSM模型为基础,在Matlab仿真软件的Simulink环境下结合S函数构建了基于SL—SVPWM的PMSM伺服系统仿真模型。通过试验比较了SPWM与SL-SVPWM控制方式下绕组相电流波形,分析了SL—SVPWM驱动下电机的动态响应性能。由仿真与试验结果可见,SL-SVPWM与SPWM相比PMSM的控制性能更为优越,与FOC相比控制系统结构、算法大为简化。     

一种新型自动舵控制策略研究

本文基于预测控制的基本思想,利用神经网络技术,提出了一种新型自动舵控制策略。仿真结果表明了其优良性能。     

联合机动编队兵力配置冲突消解

联合机动编队兵力配置是攻防作战的前提,众多兵力同时配置产生的冲突制约编队战斗力的发挥。着眼于联合机动编队整体作战效益,对联合机动编队兵力配置中的冲突消解问题展开研究。在分析联合机动编队兵力配置冲突产生原因的基础上,确定消解冲突的原则,针对联合机动编队兵力配置中的典型冲突问题提出消解方法,为解决联合机动编队兵力配置中的冲突问题提供思路。     

The effects of on‐street parking on the service rate of nearby intersections

An on‐street parking maneuver can often start a temporary bottleneck, leading to additional delay endured by the following vehicles. If the maneuver occurs near a signalized intersection, the service rate of the intersection might be reduced. In this paper, a model is built to analyze the effects of parking maneuvers on the intersection service rate. Based on the hydrodynamic theory of traffic flow, the perturbation caused by the parking maneuver is analyzed. Using dimensional analysis, we illustrate the relation between the background conditions, the distance from the parking area to the intersection, and the intersection service rate. Based on this relation, one can compute the service rate reduction caused by existing on‐street parking areas. A minimum distance between the parking area and the intersection to avoid such reduction can be accordingly found. Numerical examples based on empirical data from the city of Zurich, Switzerland, are provided to illustrate the practical applications. Although the analysis is based on streets with a single lane per direction, the findings can provide some insights regarding different situations. We hope such findings can be used as a basis for developing on‐street parking design guidelines. Copyright © 2015 John Wiley & Sons, Ltd.     

Analysis on maneuvering motion characteristics of submarine under static moment in vertical plane北大核心CSCD

[Objectives]Aiming at the problem of poor depth-changing ability of the stern rudder of submarine at low speed, and the problem of reversing the movement trend is difficult when the stern rudder is stuck and encountering abrupt changes of seawater density in the vertical steering maneuver. This paper conducts the mechanism research of static moment maneuver. [Methods]First, it is proved through theoretical analysis that the static moment maneuver can eliminate the reversed velocity phenomenon of the stern rudder. Then, the surfacing process under the static moment maneuver and the rudder hydrodynamic control is numerically simulated. [Results]The simulation results show that the static moment maneuver can make the submarine maintain good vertical plane maneuverability at low speed, eliminate the reversed velocity phenomenon of the stern rudder, and avoid excessive trim angle of the submarine at high speed. At the same time, the recovery effect of the two emergency situations of rudder jamming and falling deep has been improved. [Conclusions]The static moment maneuver is beneficial to the maneuverability and safety of the submarine. The research in this article can provide a reference for the maneuverability design of submarine. © 2023 The Author(s).