岛礁舰机艇保障配电方舱电机适能动态控制

在岛礁舰机艇装备保障中,通过对电力方舱运的性控制,提高方舱电机能量输出稳定性,提出基于稳态工况参数寻优的岛礁舰机艇保障的电机方舱适能配置和控制方法。根据电机动态参数进行直流配电系统的配电约束指标模型参数设计,构建方舱电力电子装置耐受适应性分配控制律,进行运动稳定特征分析,统计适能配置技术的运行特征,采用适能动态匹配寻优方法实现对直流配电系统的功率点因素融合处理,以输电释放容量和电机输出的稳态信号振幅为控制变量,采用间歇性的断性故功率平抑方法实现方舱电机的融合暂态参数调节和动态调度,通过模糊理论融合的方法实现发电功率的波段动态管理,实现舰机艇保障配电方舱的电机适能你给他控制。实验结果表明,采用该方法进行岛礁舰机艇保障配电方舱电机适能动态控制能力较好,输出功率因素较高,有较强的适应性和配电稳定水平。

浅议舰艇指挥算法中的数学建模问题

本文首先介绍作战指挥的概念、研究状况、功能和作用。然后以大量篇幅介绍舰艇作战指挥算法的数学建模问题,包括建模的特点、方法、建模顺序及软件支持,并给出两个例子说明建模方法的具体应用。最后给出结论和建议。

舰外有源诱饵——现代海战中电子战的热点

通过对舰外反导诱饵的相关研究 ,阐述了在现代海战中发展舰外有源诱饵的热点问题 。

调距桨轴系内孔清洗工艺开发及应用

针对舰艇调距桨轴系的金属碎屑,为避免发生机械故障的情况,采用专用清洗剂配合专用喷淋、真空回收装置对轴孔清洗的方法进行了详述,为行业在该类设备的清洗提供了新的思路。

Trajectory planning and tracking control for underactuated unmanned surface vessels

The trajectory planning and tracking control for an underactuated unmanned surface vessel(USV) were addressed.The reference trajectory was generated by a virtual USV,and the error equation of trajectory tracking for underactuated USV was obtained,which transformed the tracking and stabilization problem of underactuated USV into the stabilization problem of the trajectory tracking error equation.A nonlinear state feedback controller was proposed based on backstepping technique and Lyapunov's direct method.By means of Lyapunov analysis,it is proved that the proposed controller ensures that the solutions of closed loop system have the ultimate boundedness property.Numerical simulation results are presented to validate the effectiveness and robustness of the proposed controller.

Radar Cross Section Prediction and Reduction for Naval Ships

Radar cross section（RCS） is the measurement of the reflective strength of a target.Reducing the RCS of a naval ship enables its late detection,which is useful for capitalizing on elements of surprise and initiative.Thus,the RCS of a naval ship has become a very important design factor for achieving surprise,initiative,and survivability.Consequently,accurate RCS determination and RCS reduction are of extreme importance for a naval ship.The purpose of this paper is to provide an understanding of the theoretical background and engineering approach to deal with RCS prediction and reduction for naval ships.The importance of RCS,radar fundamentals,RCS basics,RCS prediction methods,and RCS reduction methods for naval ships is also discussed.

Global Robust and Adaptive Output Feedback Dynamic Positioning of Surface Ships

A constructive method was presented to design a global robust and adaptive output feedback controller for dynamic positioning of surface ships under environmental disturbances induced by waves, wind, and ocean currents. The ship's parameters were not required to be known. An adaptive observer was first designed to estimate the ship's velocities and parameters. The ship position measurements were also passed through the adaptive observer to reduce high frequency measurement noise from entering the control system. Using these estimate signals, the control was then designed based on Lyapunov's direct method to force the ship's position and orientation to globally asymptotically converge to desired values. Simulation results illustrate the effectiveness of the proposed control system. In conclusion, the paper presented a new method to design an effective control system for dynamic positioning of surface ships.

Robust Adaptive Path Following for Underactuated Surface Vessels with Uncertain Dynamics

A robust adaptive control strategy was developed to force an underactuated surface vessel to follow a reference path,despite the presence of uncertain parameters and unstructured uncertainties including exogenous disturbances and measurement noise.The reference path can be a curve or a straight line.The proposed controller was designed by using Lyapunov’s direct method and sliding mode control and backstepping techniques.Because the sway axis of the vessel was not directly actuated,two sliding surfaces were introduced,the first one in terms of the surge motion tracking errors and the second one for the yaw motion tracking errors.The adaptive control law guaranteed the uniform ultimate boundedness of the tracking errors.Numerical simulation results were provided to validate the effectiveness of the proposed controller for path following of underactuated surface vessels.

舰(艇)体的海水腐蚀与防护分析

分析舰(艇)体的海水腐蚀的因素,提出防止海水腐蚀防护的方法。

Numerical simulation of three interior double-layer bulkhead structures

When anti-ship missiles penetrate into the ship armor, fragments and shock waves caused by explosion will severely destroy the personnel and equipment on the ships. In this study, three double-layer bulkheads with different interior sandwich structures were investigated, including X and hexagonal combined sandwich structure, cross-type honeycomb sandwich struc-ture and cell growth type honeycomb sandwich structure. The penetration processes of three different bulkhead structures were simulated by software ANSYS/LS-DYNA. The simulation shows that the double-layer bulkhead with cross-type honeycomb sandwich structure is the most suitable. Finally, the dynamic response characteristics of the cross-type sandwich bulkhead structure are analyzed.

Path Following Control of Underactuated Ships Based on Unscented Kalman Filter

A path following controller is proposed to force an underactuated surface ship which is suffering from disturbance to follow a predefined path.The controller is based on analytic model predictive control and unscented Kalman filter(UKF) techniques.The analytic model predictive control provides a systematic method to get appropriate controller parameters to guarantee the stability of the closed-loop system,and the well-defined relative degree is guaranteed by introducing output-redefinition.The UKF is used to estimate the states and uncertain parameters due to time-varying added mass matrices.With help of the proposed UKF-based controller,the underactuated ship with time-varying parameters can follow a desired straight path.Simulation results are presented to demonstrate the effectiveness of the proposed controller.