火箭助飞声诱饵对抗鱼雷的舰艇规避优化模型及其生存概率分析

基于非线性规划理论,建立了使用助飞声诱饵对抗声自导鱼雷的舰艇规避机动模型及声诱饵的最优发射参数模型,并使用该模型对舰艇的生存概率进行了仿真计算和分析,最后得出了使用助飞声诱饵的几点结论,可解决水面舰船使用助飞声诱饵对抗声自导鱼雷的问题,对推动装备的作战使用和提高舰艇生存概率具有重要意义。

助飞声诱饵对抗声自导鱼雷数学模型及其仿真

如何使用某型助飞声诱饵对抗声自导鱼雷是水面舰艇水下防御作战中的重要问题之一。首先建立了使用某型助飞声诱饵对抗声自导鱼雷的数学模型,即舰艇的规避机动及声诱饵的发射参数模型,然后对声诱饵的发射参数和舰艇的生存概率进行了仿真计算,并对仿真结果进行了分析,最后得出有关作战使用的几点结论,对装备的作战使用具有重要意义。

护航编队使用火箭助飞声诱饵对抗声自导鱼雷仿真分析

以水面舰艇护航编队对抗声自导鱼雷为背景,分析了单舰艇使用火箭助飞声诱饵对抗来袭鱼雷,建立了声自导鱼雷攻击水面舰艇编队和火箭助飞声诱饵对鱼雷实施诱骗的数学模型,并对声自导鱼雷攻击水面舰艇编队的追踪弹道进行仿真,分析了不同护航舰艇使用火箭助飞声诱饵对抗声自导鱼雷的过程,得出了鱼雷能够成功命中编队舰艇的几种态势,并求取了一种典型态势下火箭助飞声诱饵能够有效保护编队舰艇的最佳投放位置,为编队合理使用火箭助飞声诱饵提供参考。

龙笛凤箫争雅韵--评《谁家玉笛暗飞声--中国笛萧艺术研究》

中国笛箫艺术的内涵博大精深,乐曲美不胜收,同时历代留下了众多传世名曲。李敬民先生所著新书《谁家玉笛暗飞声——中国笛萧艺术研究》有意结合了考古学、文献资料系统梳理了中国笛箫艺术发展的历程。该著作在笛萧的产生、流派的形成、文化的生成等方面详实介绍了我国笛箫艺术的发展历程。

谁家玉笛暗飞声

在灯红酒绿、物欲横流的社会中，或许只有梦，才能带给人最原始、最直接的慰藉。从垂髫孩童到花样年华，在似水流年中，在我的每一个梦中，都似乎有一支玉笛，吹出的音律跨越时空长河向我走来，笛声悠扬，

火箭助飞式声干扰器和悬浮式深弹协同对抗线导鱼雷建模与仿真

提出了使用火箭助飞式声干扰器和悬浮式深弹组合协同防御潜射线导鱼雷战术，根据线导鱼雷射击原理，仿真估算了导引艇的舷角，建立了火箭助飞式声干扰器和悬浮式深弹这一软硬反鱼雷武器组合协同防御潜射线导鱼雷的数学模型，利用运筹学中的优化方法确定了两型武器的布放策略及舰艇的规避航向，并对使用软硬武器协同对抗与单一软对抗的对抗成功概率进行了仿真比较，结果表明，使用软硬武器协同对抗效果显著，较单一使用软对抗线导鱼雷的成功概率提高了20％～36％。

谁家玉笛暗飞声

在灯红酒绿、物欲横流的社会中，或许只有梦，才能带给人最原始、最直接的慰藉。从垂髫孩童到花样年华，在似水流年中，在我的每一个梦中，都似乎有一支玉笛，吹出的音律跨越时空长河向我走来，

谁家玉笛暗飞声

在灯红酒绿、物欲横流的社会中，或许只有梦，才能带给人最原始．最直接的慰藉。从垂鬓孩童到花样年华，在似水流年中，在我的每一个梦中，都似乎有一支玉笛，吹出的音律跨越时空长河向我走来，笛声悠扬，把我带到那像在一层薄纱后神秘微笑的峥嵘岁月。

从微博传播特性看音乐类选秀节目的微博运营——以广西卫视《一声所爱·大地飞歌》官方微博为例

中国选秀类节目自2004年起至今,已经走过了近十年的历程。十年间,传播技术的进步使得选秀类节目能够通过技术手段与受众做更多的互动,从而对节目进行更好的推广和营销,微博即利用最为广泛、接触人群最广的新媒体之一。本文从传播学视角出发,分析微博具有信息整合与汇聚、开放性的信息传播以及构成受众之间"弱连带"关系的传播特性,并根据广西卫视《一声所爱·大地飞歌》官方微博的实际运营情况,提出其官方微博运营应着力于打造内容推广平台、话题制造平台、传受互动平台以及价值传递平台。

传统主持人在真人秀节目中的功能转向——以广西卫视《一声所爱·大地飞歌》为例

近年来,各省级卫视力推表演选秀型真人秀节目,不少节目纷纷出现了传统主持人角色弱化的现象,甚至出现"去主持人化"的趋势。本文以选秀型真人秀节目中的传统主持人为主要研究对象,以广西卫视的新民歌选秀节目《一声所爱·大地飞歌》为例,通过分析传统主持人的现状特点,阐释其功能作用的不可或缺。

Trigonometric Regularization and Continuation Method Based Time-Optimal Control of Hypersonic Vehicles

Aiming at the time-optimal control problem of hypersonic vehicles(HSV)in ascending stage,a trigonometric regularization method(TRM)is introduced based on the indirect method of optimal control.This method avoids analyzing the switching function and distinguishing between singular control and bang-bang control,where the singular control problem is more complicated.While in bang-bang control,the costate variables are unsmooth due to the control jumping,resulting in difficulty in solving the two-point boundary value problem(TPBVP)induced by the indirect method.Aiming at the easy divergence when solving the TPBVP,the continuation method is introduced.This method uses the solution of the simplified problem as the initial value of the iteration.Then through solving a series of TPBVP,it approximates to the solution of the original complex problem.The calculation results show that through the above two methods,the time-optimal control problem of HSV in ascending stage under the complex model can be solved conveniently.

基于方位信息的编队多诱饵协同水声对抗方法

在有距离信息的编队协同水声对抗基础上,重点研究了基于方位信息条件下舰艇编队多声诱饵协同对抗声自导鱼雷模型。提出了与编队机动规避相结合的保持来袭鱼雷航迹的多诱饵诱骗样式,给出了编队对抗条件下基于方位信息的多条诱饵诱骗轨迹中各诱饵位置的确定方法,并对典型对抗态势下的对抗效果进行了仿真分析。结果表明,与编队纯机动规避声自导鱼雷相比,基于方位信息的编队多诱饵协同对抗方法能有效提高舰艇编队在水下防御中的生存能力。提出的编队多声诱饵协同水声对抗模型可为编队水下防御作战提供决策参考。

水面舰艇鱼雷防御作战过程仿真研究

拖曳声诱饵和火箭助飞声诱饵是水面舰艇对抗来袭鱼雷的常用手段,但是由于声诱饵使用不当会将鱼雷引向舰艇,导致在鱼雷防御中的运用存在较多争议和不确定性,而且很难通过数学计算和运筹学方法得出最优化的使用方法。针对上述情况,必须从作战的实际需求出发,运用数学建模和仿真分析的方法,研究拖曳声诱饵和火箭助飞声诱饵协同对抗来袭鱼雷的过程,通过对鱼雷在运动中捕获、追踪舰艇和声诱饵的仿真,得出诱饵能够有效保护舰艇几种态势,并分析不能有效保护舰艇的原因,进一步得出拖曳声诱饵和火箭助飞声诱饵配合对抗来袭鱼雷的作战使用方法。

ADRC FRACTIONAL ORDER PID CONTROLLER DESIGN OF HYPERSONIC FLIGHT VEHICLE

Active disturbance rejection controller（ADRC）uses tracking-differentiator（TD）to solve the contradiction between the overshoot and the rapid nature.Fractional order proportion integral derivative（PID）controller improves the control quality and expands the stable region of the system parameters.ADRC fractional order（ADRFO）PID controller is designed by combining ADRC with the fractional order PID and applied to reentry attitude control of hypersonic vehicle.Simulation results show that ADRFO PID controller has better control effect and greater stable region for the strong nonlinear model of hypersonic flight vehicle under the influence of external disturbance,and has stronger robustness against the perturbation in system parameters.

Experimental Research on Enhanced Cyclone Separation of Acoustic Agglomerated Particles

To test the particles solidity and to verify the separating efficiency at normal atmospheric temperature, the experimental research was made on the enhanced cyclone separation of acoustic agglomerated fly ash particles. The separating efficiency has increased by 3%-4% in a sound field with 150 dB pressure level compared with that obtained without acoustic wave processing. The enhanced cyclone separation test study for acoustic agglomerated particles has provided a technical basis for pressurized fluid bed combustion(PFBC) application.

Research on Aircraft Noise Evaluation System

The evaluation system of aircraft noise and environment noise should be integrated, because aircraft noise belongs to environment noise. At the same time, there should be some difference in the evaluation system of aircraft noise. For solving this contradiction, this article puts forward a new evaluation system of aircraft noise. This new system unifies the evaluation of aircraft noise and other environment noise effectively, and adds a new evaluation index single event noise exposure level. The system not only considers the characteristics of aircraft noise, which is different from other traffic noise, but also adds aircraft noise to other traffic noise, which can reflect sound environment around airport really. This system has practical worthiness and theory significance.

Application of high temperature heat pipe in hypersonic vehicles thermal protection

In order to develop further the application of high temperature heat pipe in hypersonic vehicles thermal protection, the principles and characteristics of high temperature heat pipe used in hypersonic vehicles thermal protection were introduced. The methods of numerical simulation, theory analysis and experiment research were utilized to analyze the frozen start-up and steady state characteristic of the heat pipe as well as the machining improvement for fabricating irregularly shaped heat pipe which is suitable for leading edge of hypersonic vehicles. The results indicate that the frozen start-up time of heat pipe is long （10 min） and there exists large temperature difference along the heat pipe （47 ℃/cm）, but the heat pipe can reduce the temperature in stagnation area of hypersonic vehicles from 1 926 to 982 ℃ and work normally during 1 000-1 200℃. How to improve the maximum heat transfer capability and reduce the time needed for start-up from frozen state of the heat pipe by optimizing thermostructure such as designing of a novel wick with high performance is the key point in hypersonic vehicles thermal protection of heat pipe.

Robust tracking control design for a flexible air-breathing hypersonic vehicle

A nonlinear robust controller was presented to improve the tracking control performance of a flexible air-breathing hypersonic vehicle(AHV) which is subjected to system parametric uncertainties and unknown additive time-varying disturbances.The longitudinal dynamic model for the flexible AHV was used for the control development.High-gain observers were designed to compensate for the system uncertainties and additive disturbances.Small gain theorem and Lyapunov based stability analysis were utilized to prove the stability of the closed loop system.Locally uniformly ultimately bounded tracking of the vehicle's velocity,altitude and attack angle were achieved under aeroelastic effects,system parametric uncertainties and unknown additive disturbances.Matlab/Simulink simulation results were provided to validate the robustness of the proposed control design.The simulation results demonstrate that the tracking errors stay in a small region around zero.

FPGA-based High-precision Measurement Algorithm for the Ultrasonic Echo Time of Flight

Based on the evaluation of advantages and disadvantages of high-precision digital time interval measuring algorithms, and combined with the principle of the typical time-difference ultrasonic flow measurement, the requirements for the measurement of echo time of flight put forward by the ultrasonic flow measurement are analyzed. A new high-precision time interval measurement algorithm is presented, which combines the pulse counting method with the phase delay interpolation. The pulse counting method is used to ensure a large dynamic measuring range, and a double-edge triggering counter is designed to improve the accuracy and reduce the counting quantization error. The phase delay interpolation is used to reduce the quantization error of pulse counting for further improving the time measurement resolution. Test data show that the systexn for the measurement of the ultrasonic echo time of flight based on this algorithm and implemented on an Field Programmable Gate Army（FleA） needs a relatively short time for measurement, and has a measurement error of less than 105 ps.

Characterization and Performance Evaluation of Turbulent Plasma Sheath Channel

Radio waves are highly attenuated and distorted by turbulent plasma sheath around hypersonic vehicles in near space, leading to communication blackout. The purpose of the paper is to investigate the plasma channel characteristics and the communication performances over the channel. We treat the turbulent plasma medium as a fast fading wireless channel. The coherence time and the spectrum spread of the plasma sheath channel are obtained in terms of root-meansquare(RMS). Baseband simulation scheme is proposed based on a stratified model of the plasma flow field. Results indicate that the coherence time is on the order of milliseconds and decreases rapidly with the increasing electron density turbulence. The spectrum spread due to plasma turbulence is also significant. Extensive simulations have been carried out to make communication performance evaluations. Quantitative results show that error floor takes place for PSK and QAM, while FSK with noncoherent detection is a promising method to mitigate the blackout problem.