内能源转管武器变射频技术研究

提出了活塞式内能源转管武器旋塞式射频变换的具体结构,该结构是通过调节导气孔最小横断面积来实现变射频的;建立了导气装置的结构参数对武器气室压力和射频影响的数值计算模型;给出了3组导气孔孔径值不同时所对应的气室压力和射频曲线,由3组导气孔孔径数据得到了高、中、低3个射频,为变射频结构设计提供了必要的理论支持。     

转管武器启动过程中的问题研究

简单分析了转管武器由静止状态加速到稳定射速这一加速度大、射速高的启动过程,以及启动时间的长短对可射时间、射击精度和持续射击的影响,并对转管武器启动时出现的问题提出几点改进措施。     

某超高射速武器身管设计方法

超高射速武器是一种新概念武器,其显著特点是射速高。身管是其关键部件,直接制约着武器效能的发挥。为了设计合理可用的身管,首先使用matlab软件进行数值模拟,得出了在给定条件下身管的受力情况。再对各种强度理论进行分析,在此基础上,采用平均压力法来设计身管。给出了某超高射速武器身管结构尺寸的设计结果。该技术研究可为超高射速武器结构设计提供一定理论参考。     

基于龙格—库塔法的转管武器射速验算

转管武器是作战形式不断发展的产物。针对转管武器射速验算问题,提出了一种基于龙格—库塔法的方法。通过定性分析和定量计算,验证了模型的有效性和合理性。本结果为转管武器设计提供了参考。     

气室装置对变威力发射影响分析

身管开孔泄气可以有效地调节弹丸初速实现变威力发射,身管开孔后通常加装气室装置对火药气体进行密闭或者通过气室装置引导火药气体排入大气。针对气室装置结构的不同,根据经典内弹道理论及气体动力学原理,建立了变威力发射过程的数学模型,通过数值仿真分析比较了两种不同变威力发射方案调速效果,得出了不同泄气孔面积对气室压力的影响规律,并研究了气室孔面积大小对初速的影响,研究结果对外置气室装置式变威力发射武器研制具有重要的指导意义。     

基于复合形法的转管武器驱动机构优化设计

曲柄连杆机构是内能源转管武器的重要驱动机构。以曲柄连杆机构参数为优化变量建立了优化设计数学模型。运用复合形法,经过优化计算求得的曲柄连杆机构参数提高了内能源转管自动机运动的平稳性。该方法对研究曲柄连杆机构的结构参数设计具有较普遍的适用性。     

回转式气缸与导气装置的改进

我厂四车间的老师傅们,根据车床上使用的迴转式气缸在工作中的缺点,从实际出发,进行了改进。通常用的迴转式气缸有许多毛病,气缸迴转,惯性力大,对主轴运转有影响,导气装置结构复杂,工作可靠性差,寿命短,易发热,操作不安全,结构复杂和体积大等。往往在实际工作中,希望将迥转部分改为固定式结构。改进的迴转式气缸与导气装置如图所示。它去除了导气装置,固定了气     

某种转管武器的缓冲器设计

通过缓冲器的结构和参数设计,以减小转管机枪的后坐阻力。利用Matlab工具进行优化设计,获得了缓冲装置优化后的结构参数和其全枪动力学曲线。结果表明文中所述弹簧-气体缓冲器是降低转管机枪后座阻力的可行途径。     

车床回转式气缸的改进

车床上广泛使用的回转式气缸(如图1所示),是以气缸缸体20的内螺纹与车床主轴尾部联接,活塞杆与夹具拉杆联接。主轴旋转时,缸体和活塞随主轴同步旋转。气缸左右气室与导气轴8相通,运转时通过一整套导气装置使活塞工作。由此可见,回转式气缸有惯性力大、增加车床振动和降低切削     

车床回转式气缸的改进

车床上广泛使用的回转式气缸(如图1所示),是以气缸缸体20的内螺纹与车床主轴尾部联接,活塞杆与夹具拉杆联接。主轴旋转时,缸体和活塞随主轴同步旋转。气缸左右气室与导气轴8相通,运转时通过一整套导气装置使活塞工作。由此可见,回转式气缸有惯性力大、增加车床振动和降低切削     

An initial investigation of the damped resonant behaviour of gas-operated pressure balances

The aim of this investigation into the damped resonant behaviour of the piston of gas-operated pressure balances is to provide insights into ways of improving the short-term performance of gas-operated pressure balances. Initial measurement results are reported for the damped resonant behaviour of two different pressure balances as a function of system volume. The pressure balances are operated using air in absolute mode at 100 kPa and the system volume is varied from about 10 mL to 250 mL. Values for the period, the logarithmic decrement λ and the Q of the oscillation are obtained by fitting the measured damped oscillatory motion of the piston height to a classical damped oscillator model. Results show that the damping is dominated by non-adiabatic pressure variations in the system volume and not by viscous damping of the vertical motion of the piston in the cylinder. The settling time for the oscillations to damp out is primarily determined by the period of oscillation with a lesser influence from variations in λ. Implications for improving pressure balance performance are discussed.     

基于CFDesign的导气孔流量系数的数值仿真

借助计算流体力学分析软件CFDesign，以导气管式武器为例仿真得到了导气孔流量系数，为动力学分析计算提供了依据。     

低散热压燃点火天然气发动机的设计与试验

为实现单一燃料天然气的压燃着火，针对天然气自燃温度高的特点，设计了具有低散热结构的分隔式燃烧宣，同时设置了进气管空气加热装置和分隔室内陶瓷电热塞加热装置。实验研究了分隔宣通道尺寸、进气管空气加热温度、燃烧室陶瓷隔热涂层对天然气压燃着火过程的相关影响。     

随机服务系统理论在威胁估计中的应用

利用防空武器与空袭目标的对抗过程分析武器系统的作战效能,对武器系统的设计和使用者来说都是不可缺少的环节.随机服务系统理论或称排队论是一种解析分析计算武器系统作战效能的有效工具.用随机服务系统理论方法建立评价武器系统的作战效能的线性解析模型,通过线性解析模型计算空袭目标的突防概率,从而得到用于对敌空袭目标威胁估计的重要参数,根据突防概率可以提供敌空袭目标对我保卫目标或区域所构成的威胁等级,从而使指挥员做出快速、准确的应对措施.     

消防炮自适应炮头射流系统自由振动分析

消防炮自适应炮头可根据流体压力和流量变化自动调整炮口开度,从而提高消防炮的射流性能,快速高效地扑灭大型火灾。但炮头末端的自适应机构使射流系统具有流固耦合特性,在高速高压作用下,射流系统可能会发生振动乃至共振,进而影响灭火效率。考虑射流系统中流体域和固体域间的流固耦合效应以及炮头内连续体芯杆和端盖与其他离散结构间的连续离散耦合效应,通过集中质量法确定了芯杆和端盖结构的刚度矩阵,采用集中参数法建立了消防炮自适应炮头射流系统的动力学模型及方程。对射流系统进行了自由振动分析,确定了系统各阶固有频率及模态振型,分析了流体初始体积含气量和流体压力对系统固有频率的影响规律。由样机模态试验可知,理论与试验确定的一阶固有频率偏差仅为0.51%,验证了消防炮自适应炮头射流系统动力学模型的准确性。本项研究可为消防炮自适应炮头射流系统的动力学优化提供理论依据。     

Unsteady air flow measurement method based on adaptive tracking differentiator for pneumatic system

When using a flowmeter to measure unsteady air flow in the pneumatic control system, problems such as high cost and pressure loss are often encountered. It is an available method to measure the unsteady flow rate using isothermal chamber through direct differentiation of pressure signal with a traditional fixed parameter differentiator, but the adaptability of this method is insufficient due to its narrow dynamic range. To this end, an improved adaptive tracking differentiator which can adaptively adjust the control parameters according to the changes of pressure signal and pressure tracking error was proposed for unsteady air flow measurement. The algorithm structure of the adaptive tracking differentiator was designed. Moreover, theoretical simulation and flow measurement experiments under multiple working conditions were carried out. The simulation and experiment results showed that the flow measurement method based on improved adaptive tracking differentiator effectively measured the unsteady flow in a wide dynamic range, and had the advantages of more simplified process and lower cost than traditional method.     

带附加气室空气弹簧性能试验系统的搭建与试验研究

针对主、附气室通过管路连接的空气弹簧工作过程复杂性及其特殊的非线性,搭建带附加气室空气弹簧特性试验系统,进行不同附加气室容积和不同连接管路直径的空气弹簧特性试验研究;设计出基于LabView的测试软件,通过数据采集系统测得弹簧作用力、弹簧位移和弹簧内部气体压力;针对四种容积的附加气室、四种内径的连接管路和四种初始气压在0.5～10.0 Hz激振频率范围内对空气弹簧特性进行台架试验,试验分析各影响因素对弹簧特性的影响规律,并探讨各因素的影响机理。试验结果表明,试验的可变因素对空气弹簧特性具有不同程度的影响:附加气室容积和连接管路管径的增大会降低空气弹簧的动刚度,但附加气室容积对动刚度的影响程度还受主附气室容积比的影响;弹簧内初始气压和激振频率的增加会增大弹簧动刚度,台架试验可以为带附加气室空气弹簧的设计及应用提供依据。     

Experimental studies on the flow characteristics in an oscillating water column device

A fixed type oscillating water column (OWC) device was designed and tested in a 2-D wave channel. The air chamber was converged to its minimum area at the turbine section to obtain the maximum kinetic energy. The variations in the height of water in the water column and in the static pressure of the air caused by the oscillating waves were studied in detail. The airflow in the entire air chamber was documented with particle image velocimetry measurements. No turbine was installed in the device. The experiments were performed by varying the water depth and the wave frequency. It was found that the air velocities in the turbine chamber during the upward motion of water in the column are always larger than during the downward motion. While the airflow was strong most of the time, very low air velocities were recorded during the transition between the upward and downward flows indicating the need of an airflow regulator before the turbine to get a constant flow rate of air. The well-directed flow obtained at the turbine section can be used to drive a Savonius rotor, which is the most appropriate turbine for rectangular cross-section of the chamber.