浅谈水雷产品总体包装箱设计

分析了国内水雷产品的总体包装箱现状及当前存在的主要问题,针对目前我国水雷武器装备对包装保障设备新的需求,提出了水雷产品总体包装箱设计应遵循的设计要求、注重的设计创新环节以及相关计算分析和试验验证项目要求,对水雷产品的总体包装箱设计具有一定的理论与实践指导意义。     

数字式、智能型定量包装秤的设计与误差分析

本文从数字式、智能型定量包装秤的组成与特点,数字式称重传感器的选择,智能称重控制仪的设计,气动控制系统设计以及误差分析等方面进行了探讨。     

A Granular motion simulation by discrete element method

A granular system is defined as a group of tiny particles; they interact with each other by collisions and elastic force. To analyze granular dynamics, conventional methods based on continuum mechanics are not applicable, so new simulation methods are needed. Recently, thanks to improvement in computing technology, the discrete element method (DEM) is being focused on, in which equations of motion are built on each particle and the behavior of all particles is analyzed by solving those equations. In this paper, a computer program has been developed to analyze particle dynamics by using the discrete element method. As examples, the particle packing process and mono-component non-contact development process in a laser printer are simulated. It is seen that the particle motions in the processes are well described by the program.     

3-D Optical Interference Microscopy at the Lateral Resolution

For applications in micro- and nanotechnologies the lateral resolution of optical 3-D microscopes becomes an issue of increasing relevance. However, lateral resolution of 3-D microscopes is hard to define in a satisfying way. Therefore, we first study the measurement capabilities of a highly resolving white-light interference (WLI) microscope close to the limit of lateral resolution. Results of measurements and simulations demonstrate that better lateral resolution seems to be achievable based on the envelope evaluation of a WLI signal. Unfortunately, close to the lateral resolution limit errors in the measured amplitude of micro-structures appear. On the other hand, results of interferometric phase evaluation seem to be strongly low-pass filtered in this case.

Furthermore, the instrument transfer characteristics and the lateral resolution capabilities of WLI instruments are also affected by polarization. TM polarized light is less sensitive to edge diffraction and thus systematic errors can be avoided. However, apart from ghost steps due to fringe order errors, the results of phase evaluation seem to be closer to the real surface topography if TE polarized light is used. The lateral resolution can be further improved by combining WLI and structured illumination microscopy. Since the measured height of rectangular profiles close to the lateral resolution limit is generally too small compared to the real height, we introduce a method based on phase evaluation which characterizes the heights of barely laterally resolved rectangular gratings correctly.     

高压往复泵填料泄漏分析及改造

针对高压往复泵在生产运行中存在的泄漏问题,分析了填料泄漏的特点,找出了填料泄漏的原因,通过改进填料函和填料结构,选择新填料,有效地延长了填料的使用寿命.     

高压高水基棉麻动密封软填料的泄漏分析

采用柱塞式乳化液泵台架试验测定棉麻动密封软填料的泄漏滴数和第一个工作周期的时间,电子显微镜观察分析摩擦界面上微观通道的产生与连通.在高压高水基动密封工况下,这种新型软填料允许泄漏期间的泄漏形式为粘附泄漏,粘附泄漏是高水基工作介质依靠金属表面微观波谷作为载体实现的.     

一种基于线结构光的表面形貌测量方法

本文介绍了一种非接触测量方法,通过建立线结构光测量解析几何模型和视觉透视投影模型对该方法进行分析,确立实际物点与探测像点的数值关系,并搭建应用平台进行实际测量试验,取得了理想的效果。     

一种光电式烟支检测系统的设计

设计了一种包装机组烟支质置的实时检测系统,系统利用红外传感器光电转换特性。采用微处理器对检测信号进行处理。介绍了系统的组成及性能特点．阐述了系统软硬件设计方法。     

腈纶长丝装箱运动的物理仿真模型研究

腈纶长丝的装箱质量是腈纶丝装箱时需要考虑的主要问题。为达到较好的丝束装箱效果,需要对电机的运动参数进行控制,现场的控制参数是通过试验的手段来进行整定的。鉴于丝束的运动状态对装箱质量有较大影响,为了解丝束的运动状态,结合基于平纹织物物理特性的建模方法,将丝束的运动细化为丝束簇的运动。根据丝束的特性,建立了一种新的物理模型,研究了模型的受力情况及其求解过程,期望对相关的研究工作有所裨益。     

基于结构光辅助的网格候选点三维测量方法

光学三维测量技术是计算机视觉领域中最为活跃的研究主题之一.针对双目立体视觉三维测量方法中无纹理物体表面测量误差较大的问题,提出一种基于结构光投影辅助的网格候选点三维测量方法.设计灰度单调变化的锯齿波图案投射在被测场景中,有助于使三维网格候选点投影像点间的灰度差异最大化,依此提高系统的测量精度,实现了主动测量方法和被动测量方法的有效结合.通过3DS MAX和MATLAB软件平台下的仿真实验,验证了结构光辅助的网格候选点测量方法在计算精度上具有明显优势,且不会增加系统的复杂度,扩展了网格候选点三维测量方法的适用范围.