回转体气层减阻降噪模型试验研究

在拖曳水池及大型循环水槽中,分别开展了中尺度及大尺度回转体模型喷气减阻试验研究,初步探讨了喷气方式、气流量、喷孔尺度变化对减阻率、推进性能及辐射噪声的影响规律.结果表明:回转体首部喷气能有效抑制辐射噪声、降低总阻力,但会引起推进性能的下降,推进性能下降率接近于减阻率.首部单独喷气的减阻效果优于首部、中部联合喷气的减阻效...     

一种陀螺与星敏感器组合定姿算法

提出了一种利用陀螺与星敏感器进行组合定姿的方案.为了避免状态及量测向量选取不当而造成的误差,首先采用四元数法对卫星的姿态进行描述;接着分析了陀螺与星敏感器系统的误差源,选取误差四元数及陀螺的系统误差作为组合系统的状态,获得了系统状态方程;同时采用星敏感器的量测作为系统量测,并利用新的数学变换构得到更为准确的量测方程;最...     

调炮精度检测中双经纬仪优化布站方法

针对“双经纬仪法”检测调炮精度中随机布站使测量系统达不到最佳测量精度的问题,提出了一种优化布站方法.根据火炮调炮范围确定了调炮精度检测中的测量区域,推导出了双经纬仪测量系统对于该测量区域的平均测量不确定度公式.结合某型火炮设计了基于遗传算法的具体优化过程,对测量系统的3个位置参数进行优化,得到最佳测量布局,并通过仿真试...     

Numerical simulation study on penetration performance of depleted Uranium (DU) alloy fragments

Due to its high strength, high density, high hardness and good penetration capabilities, Depleted ura-nium alloys have already shined in armor-piercing projectiles. There should also be a lot of room for improvement in the application of fragment killing elements. Therefore, regarding the performance of the depleted uranium alloy to penetrate the target plate, further investigation is needed to analyze its advantages and disadvantages compared to tungsten alloy. To study the difference in penetration per-formance between depleted uranium alloy and tungsten alloy fragments,firstly, a theoretical analysis of the adiabatic shear sensitivity of DU and tungsten alloys was given from the perspective of material constitutive model. Then, taking the cylindrical fragment penetration target as the research object, the penetration process and velocity characteristics of the steel target plates penetrated by DU alloy frag-ment and tungsten alloy fragment were compared and analyzed, by using finite element software ANSYS/LS-DYNA and Lagrange algorithm. Lastly, the influence of different postures when impacting target and different fragment shapes on the penetration results is carried out in the research. The results show that in the penetration process of the DU and tungsten alloy fragments, the self-sharpening properties of the DU alloy can make the fragment head sharper and the penetrating ability enhance. Under the same conditions, the penetration capability of cylindrical fragment impacting target in vertical posture is better than that in horizontal posture, and the penetration capability of the spherical fragment is slightly better than that of cylindrical fragment.     

Study on energy release characteristics of reactive material casings under explosive loading

Reactive Materials (RMs), a new material with structural and energy release characteristics under shock-induced chemical reactions, are promising in extensive applications in national defense and military fields. They can increase the lethality of warheads due to their dual functionality. This paper focuses on the energy release characteristics of RM casings prepared by alloy melting and casting process under explosive loading. Explosion experiments of RM and conventional 2A12 aluminum alloy casings were conducted in free field to capture the explosive fireballs, temperature distribution, peak overpressure of the air shock wave and the fracture morphology of fragments of reactive material (RM) warhead casings by using high-speed camera, infrared thermal imager temperature and peak overpressure testing and scanning electron microscope. Results showed that an increase of both the fireball temperature and air shock wave were observed in all RM casings compared to conventional 2A12 aluminum ally casings. The RM casings can improve the peak overpressure of the air shock wave under explosion loading, though the results are different with different charge ratios. According to the energy release characteristics of the RM, increasing the thickness of RM casings will increase the peak overpressure of the near-field air shock wave, while reducing the thickness will increase the peak overpressure of the far-field air shock wave.     

基于信号的自动测试系统软件研究

分析了ATLAS 2K语言和IVI-S ignal Interface标准的系统模型和异同点,结合二者,给出了基于信号的自动测试系统软件设计方法,该方案为通用自动测试系统软件设计提供了技术实现途径。     

射频识别系统的多目标识别-反碰撞算法

对多目标识别技术的二进制搜索算法、时隙ALOHA算法进行了剖析,并对ALOHA算法用概率论和数理统计的方法进行了深入的理论分析,得出要根据所设计的射频识别系统的特点合理采用各种算法方可得到良好的效果.该算法的实现对提高高速公路上自动收费系统、人员和物流管理等各领域的工作效率具有一定的指导意义.     

高等数学与后续相关课程的成绩统计及数理分析

高等数学是大学教育中的主要基础课,与后续课程有密切联系。通过成绩统计和相关性分析,说明高等数学与其后续相关课程之间的关系和影响,提出数学教学的想法。     

从档案看李烈钧与湖口反袁起义

1913年7月12日爆发的江西湖口反袁起义,打响了二次革命战争。革命党人李烈钧充当了反袁急先锋。但当李烈钧由上海回到湖口准备起兵之际,因江西要塞司令陈廷训叛变投敌,北洋精锐第6师李纯部已在九江至沙河一线布防。这样,李烈钧所率领的讨袁军只能仓卒地投入战斗。旅长、左翼司令林虎首先发起攻击,于战斗失利后,旅长、右翼司令方声涛才率部进攻金鸡炮台。因此,李纯得以从容调集兵力,先后击败了讨袁军的左右两翼部队。其时,江西护军使、江西第1师师长欧阳武并不赞同起兵反袁,且加消极抵制,江西第2师师长刘世均更是动摇不定,脚踏双船,加以北洋军又策反一部分江西军队倒戈,这一切严重削弱了讨袁军的战斗力。不久,敌方援军第2师王占元部开抵江西,袁世凯任命的第1军军长段芝贵全权指挥陆军,在海军次长汤芗铭所率海军的配合下攻占了湖口。此后,讨袁军在李烈钧的指挥下,作有序的撤退。瑞昌、德安、南康等地相继陷敌。最后,李烈钧不得不于8月16日撤离,由省城南昌往长沙,辗转赴沪,再赴日本流亡于海外。湖口反袁起义宣告失败。     

牢固树立科学人才观——学习胡锦涛主席关于科学人才观的重要论述

科学人才观是做好人才工作,落实人才强军战略的思想基础。全面理解和践行科学人才观,一要牢固树立人才资源是第一资源、人人都可以成才、以人为本的观念;二要始终坚持党管人才原则,加强各级党委对人才工作的领导;三要构建与科学人才观相适应的军事人才激励机制。