基于AHP的舰船大风浪中航行安全评价

舰船在大风浪中航行的风险是一个比较重要的研究领域,其风险程度很难用量化进行评估.为了更好地方便研究,并为以后的研究奠定理论基础,采用了层次分析法,建立舰船在大风浪中航行的安全评价体系,同时构造了判断矩阵,并进行了层次单排序一致性检验,求出了每个影响舰船航行安全因素的权重,并通过实例进行解算,得出结果和实际情况相比大致相似.此方法可以较好地对舰船在大风浪中航行的安全进行直观的描述,可供舰船长用来掌握舰船航行的风险情况,进而进行有效的风险决策.     

舰艇编队舰机协同反潜警戒模型研究

反潜作战是联合机动编队的主要作战任务之一, 舰机协同反潜研究有着十分广阔的应用前景。根据舰机协同反潜行动的特点,给出了联合机动编队警戒范围的数学模型,以直升机吊放声纳和舰艇拖曳声纳为主要因素,重点研究联合机动编队及其舰载反潜直升机协同反潜作战过程中的建模与仿真问题,建立了单机和双机联合舰艇编队反潜模型。     

我国舰船配套动员能力现状、问题与对策 ——基于供应链视角的研究

舰船配套动员能力是现代化条件下海上作战能力的重要基础和根本保障。从供应链视角看,我国舰船配套动员能力仍存在诸多不足,亟待提升。本文对我国舰船配套动员能力现状进行初步评价,重点分析当前我国舰船配套动员面临的若干突出问题,如产业集中度较低、部分关键零部件可替代性差、服务保障体系不完善、供应链体系整体安全缺乏有效保障等,结合我国船舶工业发展现状,提出提升舰船配套动员能力的方向与策略,如系统提升动员供给能力、逐步实现全面自主可控、切实保障动员快速响应、着力抓好民船改装征用、有效扩展社会动员基础、确保战时生产正常稳定、健全维修服务保障体系等,并给出完善舰船配套动员工作机制、强化舰船配套动员能力建设、提高舰船配套供应链管理水平、加强舰船配套动员人才培养等相关政策建议。     

Experimental and numerical study of the blast wave decrease using sandwich panel by granular materials core

Among the intrinsic properties of some materials, e.g., foams, porous materials, and granular materials, are their ability to mitigate shock waves. This paper investigated shock wave mitigation by a sandwich panel with a granular core. Numerical simulations and experimental tests were performed using Autodyn hydro-code software and a shock tube, respectively. The smoothed particle hydrodynamics (SPH) method was used to model granular materials. Sawdust and pumice, whose properties were determined by several compression tests, were used as granular materials in the sandwich panel core. These granular materials possess many mechanisms, including compacting (e.g., sawdust) and crushing (e.g., pumice) that mitigate shock/blast wave. The results indicated the ineffectiveness of using a core with low thickness, yet it was demonstrated to be effective with high thickness. Low-thickness pumice yielded better results for wave mitigation. The use of these materials with a core with appropriate core reduces up to 88% of the shock wave. The results of the experiments and numerical simulations were compared, suggesting a good agreement between the two. This indicates the accuracy of simulation and the ability of the SPH method to modeling granular material under shock loading. The effects of grain size and the coefficient of friction between grains have also been investigated using simulation, implying that increasing the grain size and coefficient of friction between grains both reduce overpressure.     

双浮体波浪能转换装置中重心布置对波浪能吸收影响分析

提出一种基于横摇运动的双浮体波浪能转换装置,利用水面浮体与水下浮体之间的相对横摇运动实现对波浪能的吸收。在保持水下浮体稳定的前提下,水面浮体的横摇运动决定了整个装置对波浪能吸收情况。水面浮体的横摇运动受其横摇固有频率的影响,主要是重心布置。为了合理选择水面浮体的重心位置,采用数值分析的方法对箱型浮体在长峰不规则波下的工作情况进行分析,讨论重心布置对波浪能吸收的影响以及对PTO参数选择的影响。结果表明,重心的布置可改变波浪能吸收的频段,重心布置越低,可吸收的波浪能频段越广,越有利于波浪能的吸收。     

箔条干扰条件下舰空导弹单发杀伤概率计算

目前,对导弹抗干扰能力的要求越来越高,干扰条件下的导弹单发命中概率已成为评定导弹性能的重要指标.针对箔条干扰条件下舰空导弹单发杀伤概率评定,建立了雷达导引头接收端信干比模型、舰空导弹圆目标落入概率模型以及抗干扰改善因子模型,从而构建了箔条干扰条件下舰空导弹单发命中概率模型,计算出真实有效的单发命中概率.     

基于AHP与熵权的舰艇编队信息作战能力模糊综合评估

在确立了舰艇编队信息作战能力评估指标体系的基础上,运用AHP和熵权法,得到评价指标的综合权重.通过模糊综合评判,得出综合评判总分.以舰艇编队的信息侦察处理能力为例进行综合评估.最后通过进一步研究分析,构建了一种数学模型,用于找出影响舰艇编队信息作战能力的薄弱指标.     

漂浮式微型波力发电装置传动系统的速度分析与调节

针对边防驻岛官兵用电难的问题,结合海洋波浪能特点,提出了一种新型漂浮式微型波力发电装置。基于装置结构模型,分析了其结构特征和工作原理;建立了传动系统的运动学模型,分析了其运动特性和速度调节性能;进行算例分析,验证了理论模型的正确性。研究表明：双侧传动轮系输入系统优于单侧传动轮系输入系统;改变飞轮的转动惯量,可以调节速度的波动。分析结果为该装置的后续试验研究提供了理论依据。     

Study of simple plane wave generator with an air-metal barrier

Plane wave generators (PWGs) are used to accelerate flyer plates to high velocities with their generated plane waves, which are widely used in the test of dynamic properties of materials. The traditional PWG is composed of two explosives with different detonation velocities. It is difficult to implement the related fabrication processes and control the generated waves due to its complicated structures. A simple plane wave generator is presented in this paper, which is composed of two identical cylindrical high explosive (HE) charges and an air-metal barrier. A theoretical model was established based on two different paths of the propagation of detonation waves, based on which the size of air-metal barrier was calculated for a given charge. The corresponding numerical simulations were also carried out by AUTODYN-2D^® based on the calculated results, which were used to compare with the theoretical calculations. A detonation wave with a flatness of 0.039 μs within the range of 70-percent diameter of the main charge was obtained through the simulations.     

高超声速飞行器中若干气动难题的实验研究

回顾了近几年本研究团队在高超声速飞行器若干气动难题方面的实验研究进展。在边界层转捩方面,测量了边界层转捩现象,研究了攻角效应对圆锥边界层转捩的影响,获得了边界层转捩的脉动特性以其对飞行器表面热流和摩阻的影响。在激波-边界层干扰方面,分析了突起物形状变化对流动特性的影响,研究了复杂外形的流动特性。