一种双足驱动直线超声波电动机的设计

设计了一种单边双足驱动的面内振动直线超声波电动机，其定子采用了一片铜板和八片压电陶瓷构成的复合结构，压电点陶瓷沿着厚度方向极化，对称安装在矩形铜板的两个表面上。建立了该电机的机电耦合动力学模型，通过仿真确定了驱动足的位置，并试验研究了电机的特性。     

多功能弹性管接头的研制

为了改善现有弹性管接头伸缩量小、压力损失大等严重缺陷,研制了一种新型多功能弹性管接头,介绍了多功能弹性管接头的结构设计与制造工艺,并举例说明了样品的设计和制作。样品检测结果表明:该多功能弹性管接头具有弹性伸缩量可调、压力损失小等性能特点,满足使用要求,具有一定的推广价值。     

爆炸冲击的激光多普勒远距离测量技术的研究

利用激光多普勒效应和数字信号处理方法,获取爆炸冲击过程中的高速变形参数,以此作为对爆炸强度分析的依据。根据爆炸变形的特点,设计了外差式纵向激光多普勒测量系统,提出了相应的数字滤波和频谱分析的信号处理方法,实现了爆炸变形的动态测量。系统测量的位移量程为±30mm,速度量程为-10~+20m/s,测量距离为4.5m。与振动台的试验对比,位移测量相对误差小于1%。给出了圆筒钢制爆炸容器在300gTNT当量炸药爆炸过程中弹性变形的测量结果。     

双参数弹性地基板的动力问题

针对目前带自由边的双参数弹性地基板的边界条件及基本方程在使用上的混乱情况,为了板与地基动力相互作用理论的严密性和计算的可靠性,将板和地基作为一个总系统,利用H am ilton动力变分原理,重新系统地审视了双参数弹性地基上板动力问题的基本理论,给出了地基附加质量影响的明确计算公式,建立了考虑地基附加质量影响的基本方程和边界条件,并对边界条件的简化进行了讨论.所得的结果还可推广到位于层状地基上的板的分析.     

磁弹性板的精化理论

将Cheng精化理论推广到磁弹性板的研究中,对磁弹性板进行了精确的分析。从Huang和Wang给出的线性软磁材料的位移通解出发,利用中面上位移及其沿板厚方向的梯度,将板内的位移表示出来,并获得板内应力张量。利用Pao和Yeh给出的线性边界条件和Lur’e算子方法,给出磁弹性板的精化理论。其中挠度方程略去高阶项后,与磁弹性薄板的挠度方程一致。     

人脸识别技术

人脸图像的易取性和人脸变化的多样性使人脸识别研究更富有挑战性.按照人脸检测、特征提取和识别3个关键过程,分别对基于二维和三维人脸信息的人脸识别技术和方法进行了详细的阐述;展望了人脸识别研究的趋势,并提出了可能取得突破性研究进展的研究途径.     

旧料生产锡磷青铜带材急冷破鳞开裂原因及其探讨

阐述了在实际生产过程中，因大量使用镀白旧料生产锡磷青铜带材，在急冷破鳞时易出现开裂现象及其产生的原因。根据其特有的生产工艺及特点提出了相应的解决方法。     

沉桩效应的差异分析

运用Crisp程序, 对饱和砂土中的打桩效应进行有限元分析。采取线弹性、理想弹塑性两种本构关系以及应力边界条件法、圆柱孔扩张理论两种沉桩过程模拟方式分别进行组合计算, 并对三种计算组合由于不同的本构关系和沉桩过程模拟方式所引起的超孔隙水压力、径向有效应力增量、地面隆起以及桩周土径向位移等沉桩效应的差异进行讨论, 得出一些初步结论。     

Conformal analysis of fundamental frequency of vibration of simple-supported elastic ellipse-plates with concentrated substance

Aimed at calculating the fundamental frequency of vibration of special-shaped, simple-supported elasticplates, Conformal Mapping theory is applied, and the mathematical method of trigonometric interpolation with interpolation points mutual iterative between odd and even sequences in boundary region is provided, as well as the conformal mapping function which can be described by real number region between complicated region and unit dish region is carried out. Furthermore, in the in-plane state of constant stress, vibrating function is completed by unit dish region method for simple-supported elastic plates with concentrated substance of complicated vibrating region, and the coefficient of fundamental frequency of the plate is analyzed. Meanwhile, taking simple-supported elastic ellipseplates as an example, the effects on fundamental frequency caused by eccentric ratio, the coefficient of constant inplane stress, as well as the concentrated substance mass and positions are analyzed respectively.     

Optimum Design of Welded Steel Plate Girder Bridges Using a Genetic Algorithm with Elitism

The genetic algorithm (GA) is a general optimization technique that has some unique features that are especially suitable for structural engineering problems. This work uses a simple GA with elitism to find the optimum design of welded steel plate girder bridges. The objectives are to minimize the weight and the cost of the girders. Two types of plate-girder bridges are studied: a single-span bridge and a two-equal-span continuous bridge. Bridges with various span lengths, in increments of 20?ft, are investigated; results are tabulated, parametric studies are made, and meaningful conclusions are drawn.