火箭弹抗强电磁脉冲的防护包装研究

在分析强电磁脉冲及其对火箭弹破坏机理的基础上，提出了两种防强电磁脉冲的火箭弹防护包装措施。     

出口包装质量控制方法的探讨与研究

针对我国出口包装生产企业的质量管理情况进行回顾与分析，并由此提出控制出口包装质量的根本方法在于过程控制而不是事后检验把关的观点，改变以往主要部门重检验轻管理的现状，在此参照目前国际流行的质量管理模式－－ＩＳＯ９０００系列标准，结合我国包装企业的特点，提出一套对出口包装企业产品质量控制方法，供出口包装企业及其主管部门参考。     

电磁屏蔽材料在火箭弹包装中的应用

在分析火箭弹意外发火,瞎火原因的基础上,提出了利用屏蔽材料对火箭弹包装进行改进的相关技术。     

基于WWW环境下包装产品数据库的设计

详细介绍了运用ASP动态网页技术结合Access、FrontPages等软件建立包装产品动态数据库方法和步骤，阐述了该包装产品数据库工作原理，并给出了将该数据库应用于包装产品商业网站的总体设计框架，为电子商务应用服务的发展作了准备。     

面向对象的制造系统过程建模方法的研究

在分析了面向对象Ｏ－Ｏ技术在过程建模中的优点的基础上,采用Ｏ－Ｏ技术定义了企业过程对象类结构,并在此基础上建立了面向对象的企业过程模型结构２,这一模型结构通过企业过程对象将企业的组织,活动和资源全面集成。     

面向对象的神经网络类库

提出一种面向对象的神经网络类库的构造方法。该类库采用面向对象的方法，集成了当前比较成熟的人工神经网络模型，充分利用了ＯＯＰ方法的继承性、封装性和多态性，便于在现有基础上派生出新的神经网络模型。该类库将被用于实现一种最新的同步振荡神经网络－ＬＥＧＩＯＮ网络。由于系统的结构性和代码的可重用性，既有利于科研工作者进行神经网络的研究，也便于工程人员的神经网络应用。     

某新型弹药空投系统设计

分析了空投装备对现代军事物流的意义,重点介绍了某新型火箭弹空投系统中降落伞的设计和缓冲包装的设计,初步确定了空投装备的设计模式.     

ERT模型的面向对象分析

实体－关系时态（ＥＲＴ）模型是非常实用的模型，它具有图形表示、分析容易、抽象性好、易读和表达能力强等优点，并且还具备面向对象模型所具有的很多性质。本文对ＥＲＴ模型做了进一步的改进，并讨论ＥＲＴ模型与面向对象模型的共性，从而提出ＯＯ－ＥＲＴ模型及其实现方法。     

演绎的面向对象数据库(DOOD)研究

介绍了在演绎库（ＫＢＡＳＥ－Ｐ）与对象库（ＦＯＯＤＢ）基础上实现的一个演绎的面向对象数据库系统（ＤＯＯＤ），系统支持对象的递归查询等操作，还引入了ＩＯＤＢ与ＤＯＤＢ等概念，用于演绎对象的生成。系统采用Ｏ－ＤＡＴＡＬＯＧ语言，用于实现对象间的演绎，并继承了演绎库的优化策略。     

出口商品包装生产企业实施ISO9000系列标准的思考

出口商品包装生产企业实施ＩＳＯ９０００系列标准的思考甘肃商检局王冬祥为了适应国际经济合作发展和进出口贸易的需要，协调各国的质量保证标准，国际标准化组织于１９８７年发布了ＩＳＯ９０００质量管理和质量保证标准。由于ＩＳＯ９０００系列标准总结、吸取了各国质...     

基于柔性多体动力学的瓦楞成型系统建模与仿真研究

针对某型号瓦楞机的瓦楞成型系统,基于自主研发的多体动力学求解程序,建立其刚柔耦合动力学模型。其中张力辊、瓦楞辊等主要支撑辊简化为刚体模型;传送带由36自由度绝对节点坐标四边形壳单元划分网格,并考虑其树脂材料的正交各向异性特征;此外,传送带与支撑辊之间的接触采用赫兹碰撞模型和点-面检测方法描述。利用该模型,计算了传送带的偏心位移,传送带表层应力场等动响应。仿真表明:基于绝对节点坐标法建立的瓦楞成型系统的多体动力学模型,可为瓦楞机传送带的动力学行为和控制研究提供一种新的分析方法。     

Finite element analysis of closed-cell aluminium foam under quasi-static loading

Closed-cell aluminium foam was represented with a new type of repeating unit-cell (RUC) constructed from the tetrakaidecahedra structure. After that the thin shell geometrical parameters and material properties of aluminium foam were assigned to this unit-cell. Finite element studies were then conducted to evaluate the stiffness and mechanical response of this model under large strain. Our results are compared to cruciform-pyramidal and cubic-spherical unit-cell foam models that describe the load and global deformation response in-terms of unit-cell structure. We demonstrate that the plateau phase stress–strain characteristics of our model are more representative of real aluminium foam. It was also found that the crushing resistance and energy absorption capability of tetrakaidecahedral foam was higher than the cruciform-pyramidal and cubic-spherical foam models.     

压电集成碳纳米管CNT增强功能梯度结构非线性建模与仿真

将碳纳米管(carbon nanotube,CNT)以梯度形式分布与基体材料结合,形成功能梯度(functionally graded,FG)结构。为了实现FG-CNT增强复合板在发生大变形时的准确计算,考虑四种典型的CNT分布形式,均匀分布、V型分布、O型分布和X型分布,建立基于Reissner-Mindlin板壳假设的大变形几何非线性有限元模型。该模型不仅包含了几何全非线性应变位移关系,还考虑了薄板结构法向发生大转角的情形。该研究与文献结果进行比较,验证模型的准确性;对FG-CNT增强复合板进行几何大变形非线性计算,分析CNT分布形式、CNT增强角度等因素对FG-CNT增强复合板刚度的影响。研究结果表明,CNT分布形式及增强角度对FG-CNT复合板的力学特征有显著的影响。     

Analysis of cylindrical shell panels. A meshless solution

The Meshless Analog Equation Method, a purely meshless method, is applied to the static analysis of cylindrical shell panels. The method is based on the concept of the analog equation of Katsikadelis, which converts the three governing partial differential equations in terms of displacements into three substitute equations, two of second order and one fourth order, under fictitious sources. The fictitious sources are represented by series of radial basis functions of multiquadric type. Thus the substitute equations can be directly integrated. This integration allows the representation of the sought solution by new radial basis functions, which approximate accurately not only the displacements but also their derivatives involved in the governing equations. This permits a strong formulation of the problem. Thus, inserting the approximate solution in the differential equations and in the associated boundary conditions and collocating at a predefined set of mesh-free nodal points, a system of linear equations is obtained, which gives the expansion coefficients of radial basis functions series that represent the solution. The minimization of the total potential of the shell results in the optimal choice of the shape parameter of the radial basis functions. The method is illustrated by analyzing several shell panels. The studied examples demonstrate the efficiency and the accuracy of the presented method.     

Vibration damping characteristics of carbon nanotubes-based thin hybrid composite spherical shell structures

The present work deals with the evaluation of elastic properties and dynamic analyses of thin hybrid composite shell structures, which consist of conventional carbon fiber as the reinforcing phase and multiwalled carbon nanotubes-based polymer as the matrix phase. The Mori-Tanaka and strength of material method has been implemented to determine the elastic properties of such hybrid composite structures without and with considering agglomerations. An eight-noded shell element, which considers stress resultant-type Koiter's shell theory and transverse shear effect as per Mindlin's hypothesis having five degrees of freedom at each node, has been utilized for discretizing and analysis of such hybrid shell structures. The Rayleigh damping model has been implemented in order to study the effect of carbon nanotubes (CNTs) on damping capacity of such hybrid composite shell structures. Different types of spherical shell panels have been analyzed in order to study the time and frequency responses. Results show that the elastic properties as well as damping properties of such hybrid composite structures improved with the addition of CNTs as compared to conventional carbon fiber reinforced composites laminates; effects of some important parameters on the vibration characteristic of such hybrid composite shell structures have also been presented. The effects of agglomeration parameters on the elastic properties and their influences on the dynamic responses considering different layers and stacking sequences have also been investigated.     

半球谐振陀螺一种测角速率的方法

本文介绍了基于英国科学家G.H.Bryan的理论而工作的新型半球谐振陀螺仪(HRG)的工作原理。描述了半球谐振陀螺的测角过程。当陀螺壳体绕中心轴旋转时,由于哥氏效应(coriolis effect),谐振子振型相对壳体产生进动,通过控制双点激励力的幅值比,可实现振型对壳体转动角的跟踪,从而形成一种半球谐振陀螺检测角速率的方法。     

Multiscale modeling of the impact of textile fabrics based on hybrid element analysis

In this work, a multi scale modeling approach has been developed to simulate the impact of woven fabrics using a finite element (FE) analysis. A yarn level of resolution is used in the model. This approach, referred to as the hybrid element analysis (HEA) is based on decreasing the complexity of the finite element model with distance away from the impact zone based on the multiscale nature of the fabric architecture and the physics of the impact event. Solid elements are used to discretize the yarns around the impact region, which transition to shell elements in the surrounding region. A new method for modeling the shell yarns is incorporated that more accurately represents the contours of the yarn cross section. Impedances have been matched across the solid–shell interface to prevent interfacial reflections of the longitudinal strain wave. The HEA method is validated by first applying it to the FE model of a single yarn for which an analytical solution is known. The HEA method is then applied to a woven fabric model and validated by comparing it against a baseline model consisting of yarns discretized using only solid elements.     

A Continuum Based Thick Shell Element for Large Deformation Analysis of Layered Composites

A new continuum based thick shell model is presented for modeling orthotropic laminated shell structures undergoing large elastic deformations. An equivalent single-layer model involving seven nodal degrees of freedom is used. In that layered model, there are no restrictions on the number of layers, their thickness and their stacking sequence. The shell model accounts explicitly for the thickness change in the shell, as well as the normal stress and strain states through its thickness. Shear locking is avoided using an assumed natural strain formulation, while thickness locking is avoided using modified displacement interpolation functions. The performance of the layered shell element is tested using several linear and non-linear composite plate and shell problems involving anisotropic, angle and cross-ply laminates, cylindrical and spherical shells.     

The transient response of a two-layered elastic cylindrical shell impinged by an underwater shock wave

The governing equations of a two-layered circular cylindrical shell have been derived. A recently developed theoretical approximation, the reflected-afterflow-virtual-source (RAVS) model was applied to determine the fluid–structure interaction. Cases of two-layered infinitive length elastic cylindrical shell impinged by planar shock waves were investigated by using finite difference method. Results by using this model were compared to those by using the software USA/LSDYNA3D, and they are in good agreement. Some parametric studies were done to study the effect of the Young's modulus E_i and thickness h_i of the structure on the transient responses of the shell.     

Resonant Energy Transfer can Trigger Multiexciton Recombination in Dense Quantum Dot Ensembles

Core/shell quantum dots/quantum rods are nanocrystals with typical application scenarios as ensembles. Resonance energy transfer is a possible process between adjacent nanocrystals. Highly excited nanocrystals can also relax energy by multiexciton recombination, competing against the energy transfer. The two processes have different dependencies and can be convolved, resulting in collective properties different from the superposition of the individual nanocrystals. A platform to study the interplay of energy transfer and multiexciton recombination is presented. CdSe/CdS quantum dot/quantum rods encapsulated in amphiphilic micelles with an interparticle distance control by spacer ligands are used for time‐resolved photoluminescence and transient absorption experiments. At exciton populations around one, the ensemble starts to be in a state where energy transfer can trigger multiexciton Auger recombination, altering the collective dynamics.