太安的降静电表面处理

介绍了用表面活性剂处理太安的方法，对处理后的太安进行了静电性能测试和分析，得出最佳抗静电用表面活性剂的种类及使用浓度。实验结果表明。太安炸药经过表面活性剂处理后，其静电得到大幅度降低，有利于导爆索生产工艺与质量。     

Application of Piezoelectric Materials in a Novel Linear Ultrasonic Motor based on Shear-induced Vibration Mode

A novel linear ultrasonic motor based on d15 effect of piezoelectric materials was presented. The design idea aimed at the direct utilization of the shear-induced vibration modes of piezoelectric material. Firstly, the inherent electromechanical coupling mechanism of piezoelectric material was investigated, and shear vibration modes of a piezoelectric shear block was specially designed. A driving point's elliptical trajectory induced by shear vibration modes was discussed. Then a dynamic model for the piezoelectric shear stator was established with finite element(FE) method to conduct the parametric optimal design. Finally, a prototype based on d15 converse piezoelectric effect is manufactured, and the modal experiment of piezoelectric stator was conducted with laser doppler vibrometer. The experimental results show that the calculated shear-induced vibration modes can be excited completely, and the new linear ultrasonic motor reaches a speed 118 mm/s at noload, and maximal thrust 12.8 N.     

起爆索的概念及其特性

本文采用了新的导爆索芯药,得到了一种具有起爆特性的索,称之为起爆索。它能够被常规的电点火头、非电导爆管或延期体点火,并很快形成爆轰输出,对工业炸药实现引爆,因而具备工程雷管的功能。经过对起爆索爆速、殉爆距离、点火感度、起爆能力、轴向威力等的测定,反映出爆速与芯药线密度有关,其殉爆距离是普通导爆索的4倍多,对常规的电、非电导爆管和延期体点火方式则有较好的感度响应,爆速接近5 000 m/s时能够对粉状炸药、乳化炸药或水胶炸药实施引爆,而起爆索的轴向威力只达到2 mm厚铅板炸孔的合格水平。     

一种新型导爆管下药系统的研究?

当前导爆药下药工艺普遍依靠药剂自重完成,存在管体药剂分布不均、爆速波动较大的问题。针对此问题,设计了依靠下药游标精确控制下药量的一种新型下药系统。下药游标采用变频电机驱动,设计了定容药槽,可根据不同的拉制速度调整游标转速,精确且方便地控制下药量;另通过一种新的检测方法(失重法),实时测量导爆管每米的药量,从而提高导爆管质量。     

Adaptive discrete neural observer design for nonlinear systems with unknown time‐delay

This paper focuses on the adaptive observer design for nonlinear discrete‐time MIMO systems with unknown time‐delay and nonlinear dynamics. The delayed states involved in the system are arguments of a nonlinear function and only the estimated delay is utilized. By constructing an appropriate Lyapunov–Krasovskii function, the delay estimation error is considered in the observer parameter design. The proposed method is then extended to the system with a nonlinear output measurement equation and the delayed dynamics. With the help of a high‐order neural network (HONN), the requirement for a precise system model, the linear‐in‐the‐parameters (LIP) assumption of the delayed states, the Lipschitz or norm‐boundedness assumption of unknown nonlinearities are removed. A novel converse Lyapunov technical lemma is also developed and used to prove the uniform ultimate boundedness of the proposed observer. The effectiveness of the proposed results is verified by simulations. Copyright © 2010 John Wiley & Sons, Ltd.     

用厚度阈值法改善深拉延冲压件坯料形状预测精度

将作者首次提出的厚度阈值法应用到基于逆有限元原理的坯料形状预测算法中,有效地改进了深拉延冲压件坯料形状预测的精度,并以某汽车油底壳拉延件为实际算例,分别用改进前和改进后的算法,对其坯料形状进行预测,预测结果与实际坯料形状的对比结果验证了本文方法的有效性。     

压电陶瓷选针机构及其驱动电路的设计

介绍了压电陶瓷电子提花机的特点和设计制造中的难点。在阐明压电陶瓷特性的基础上．结合电子提花机的实际要求．设计了压电陶瓷片作制动元件的选针机构。通过对驱动电路的工作原理的论证，完成相适应的驱动电路设计。设计原理和结构的可靠性已通过样机试运行证实。     

基于制导引信一体化的自适应起爆控制

引信与导引头一体化( GIF)设计是提高引战配合效率的有效途径.结合一般雷达导引头,首先介绍一种波控引信与硬件一体化引信进行设计,提出一体化引信起爆控制的逻辑算法流程;然后建立基于GIF信息条件下和基于引信自身信息条件下的两种弹目交会模型,并推导了最佳起爆角、起爆延时的数学表达式;最后分析计算几种弹目交会条件下,多普勒...     

《材料力学》课程教学的改革与实践

本文分析了对土木工程等专业本、专科生开设“材料力学”课程的必要性及存在的问题;并结合多年教学实践,从教学内容和教学方法上开展课程教学改革。实践表明,采用从实际到理论的逆向思路,选择与本学科相关的实例开展材料力学理论的教学,可以激发学生的学习积极性,使教学效果得到明显的提高。     

基于重复检测的多摘要消重方法

针对目前Web信息挖掘中存在大量页面重复的问题,从Web信息的组织角度对其中的一些关键问题进行深入分析,提出了基于关键词的部分相似页面消重算法——Web多摘要消重方法（multi abstractremoverepeat,MARR）。MARR方法对传统基于词表和倒排文件的Web信息数据库进行改装,增加一个字段用于记录关键词所对应的摘要块号,采用文本摘要算法,按倒排文件方式索引,根据内容基于查询词目的相似程度,在检索过程中过滤或标识与查询词目相关的部分内部重复现象,以获得更合理的检索结果组织形式。MARR方法还将传统按PageRank值顺序排列改成树型组织方式,以方便用户信息发现的需要。该方法在基于三明钢铁集团MES智能信息代理的原型化Web检索系统中得到应用。