基于DirectX技术的飞机飞行过程再现

分析了飞行过程再现的技术要求，研究了如何使用DirectX的Direct3D、DirectDraw、DirectSound等技术再现飞行过程。讨论了飞机离散点航迹误差的修正、插值算法以及时间同步播放控制问题。采用Visual C 6．0编程语言，开发了可在普通PC机上运行的飞机飞行过程再现软件，获得了满意的视觉放果。     

16通道数字视频录像机的设计与实现

研究了16通道数字视频录像机的设计与实现。数字视频录像机是针对安防行业的特点而设计的替代传统磁带录像机的数字产品，利用PCI-捕捉编码卡完成16路视频图像的采集和编码，采用先进的视频编码标准H-264对图像进行压缩，在使用8块120GB的硬盘的环境下，录像时间可达到15天，并可随时对录像资料进行监视和回放。满足了安防行业的要求。     

冲击波作用下薄壁结构机弹相容性研究

对轻型直升机薄壁结构尾梁在发射空地导弹所产生的冲击波作用下的振动响应进行了有限元分析．根据计算结果提出了两种结构改进设计方案用于试验验证。试验使用的导弹模拟发射器产生的冲击波与实际导弹一致，用一个1：1的尾梁试验件实现了两种不同的结构改进方案，在不同的改进方案、导弹布置位置组合下，发射了60枚模拟导弹。试验表明对于轻型直升机薄壁无长桁主承力结构，只要以极小的重量代价改进结构设计，就能够满足机弹相容性要求。     

PGG隔震器性能试验与分析

本文根据研制的普通钢丝绳鼓型隔震器(简称PGG隔震器)的静力试验，建立了PGG隔震器水平向和垂直向的非线性刚度模型。经冲击台动力试验和理论计算分析，表明PGG隔震器具有优良的爆炸冲击震动隔震性能。     

多排钢管冲击波压扁行为研究

多排钢管吸能元件在冲击波作用下的大变形问题，对于抗爆结构的吸能装置设计具有重要意义。在单个钢管的动力压扁过程清楚的基础上，根据实验分析了多排钢管受径向冲击塑性行为，建立了八塑性铰机构，描述了钢管压扁位移速度场。给出了塑性铰附近的塑性弯矩值计算方法。     

带限位器的浮筏隔振系统的冲击响应分析

研究带限位器浮筏隔振系统力学模型及在基础冲击激励下的响应,应用多刚体系统动力学理论,首先给出了带有限位器的浮筏隔振系统在局部坐标系下刚度矩阵表达式,然后在总体坐标系下建立了浮筏隔振系统的运动方程,采用纽马克直接积分法计算带限位器的浮筏隔振系统在基础冲击激励下的运动响应,并结合工算例进行讨论,得到了有意义的结论.     

筏体和基础弹性对设备冲击响应影响的有限元分析

带有限位器的浮筏隔振系统是非线性系统,利用ANSYS建立了这一非线性系统的有限元模型,计算了带有限位器的浮筏隔振系统模型的冲击响应,分析了筏体弹性、基础弹性和限位器参数对冲击响应的影响.计算结果表明筏体弹性和基础弹性对系统的冲击响应均有一定程度的影响,它们使得机组的最大加速度响应减小,筏体和机组的最大位移响应增大.对于刚性浮筏隔振系统和弹性浮筏隔振系统,限位器间隙与冲击响应之间的关系是相同的,即随着限位器间隙的减小,筏体和机组的最大加速度响应增大,而最大位移响应都减小.     

A spectral‐element method for modelling cavitation in transient fluid–structure interaction

In an underwater‐shock environment, cavitation (boiling) occurs as a result of reflection of the shock wave from the free surface and/or wetted structure causing the pressure in the water to fall below its vapour pressure. If the explosion is sufficiently distant from the structure, the motion of the fluid surrounding the structure may be assumed small, which allows linearization of the governing fluid equations. In 1984, Felippa and DeRuntz developed the cavitating acoustic finite‐element (CAFE) method for modelling this phenomenon. While their approach is robust, it is too expensive for realistic 3D simulations. In the work reported here, the efficiency and flexibility of the CAFE approach has been substantially improved by: (i) separating the total field into equilibrium, incident, and scattered components, (ii) replacing the bilinear CAFE basis functions with high‐order Legendre‐polynomial basis functions, which produces a cavitating acoustic spectral element (CASE) formulation, (iii) employing a simple, non‐conformal coupling method for the structure and fluid finite‐element models, and (iv) introducing structure–fluid time‐step subcycling. Field separation provides flexibility, as it admits non‐acoustic incident fields that propagate without numerical dispersion. The use of CASE affords a significant reduction in the number of fluid degrees of freedom required to reach a given level of accuracy. The combined use of subcycling and non‐conformal coupling affords order‐of‐magnitude savings in computational effort. These benefits are illustrated with 1D and 3D canonical underwatershock problems. Copyright © 2004 John Wiley & Sons, Ltd.     

不同冲击波强度下流体界面运动变化的数值模拟

采用数值模拟的方法对不同冲击波强度条件下界面的运动变化进行了数值模拟，探讨了冲击波强度对界面运动变化的影响，该研究为提高不同流体间的混合效果提供了依据。     

Radial explosion strain and its fracture effect from confined explosion with charge of cyclonite

Instrumented experiments were conducted in concrete models to study the explosion-induced radial strain and fracture effect of rock-like media under confined explosion with a charge of cyclonite. As a charge was exploded,two different radial strain waves were sequentially recorded by a strain gage at a distance of 80 mm from the center of charge. Through the attenuation formula of the maximum compressive strain(εrmax), the distribution of εrmax and its strain rate(ε) between the charge and gage were obtained. The effect of the two waves propagating outwards on the radial fracture of surrounding media was discussed. The results show that the two waves are pertinent to the loading of shock energy (Es) and bubble energy (Eb) against concrete surrounding charge, respectively. The former wave lasts for much shorter time than the latter. The peak values of εrmax and ε of the former are higher than those of the latter, respectively.