三峡工程大江截流戗堤坍塌问题试验研究

 浅析了三峡工程大江截流堤头坍塌机理,并研究了用小粒径材料截流、平抛垫底以减小水深的两种解决措施。研究结果认为:采用先平抛垫底到高程40m或45m,再立堵截流的方案比较现实可行。     

半刚性基层振动成型法探讨

通过施工实践经验，对半刚性基层振动成型法工作原理、主要优势、工艺要求等做了简要阐述，实践证明：振动成型法的应用符合延长道路使用寿命的发展理念，应进一步推广。     

钛合金焊接件密封问题研究

水下大功率振源体的质量关键除了焊接质量就是密封面的密封性，特别是焊接结构的强振体能否达到良好的密封性是工艺结构的一大难点。根据我们现有的机械加工设备能力和振源体结构特点，无法对振源体组焊件整体真空消应热处理后进行密封面的加工。文中介绍了采用修配座圈窗盖和增大O形圈截面直径的方法，提高了振源体组件的密封性。     

砖拱楼盖房屋振动试验与分析

本文给出了矢跨比分别为1/10和1/6的两幢二层砖拱楼盖房屋模型的振动台试验结果。对整个模型房屋建立了弹性支承杆系力学模型,用频率响应法分析了模型的位移反应,导出了相应的频率响应函数,并对各阶段的模型刚度参数进行了讨论。对砖拱楼盖,采用拱框结构力学模型进行了自由振动分析,并探讨了局部振动和整体振动等同题。     

解弦振动方程初始条件的反问题

文[1]使用抽象半群的处理方法,证明了一根具端点粘滞阻尼的振动弦的初始状态的可辨识性,证明了该系统是谱系统并且可辨识性完全由观测时间长度决定。本文利用特征线法直接求解该辨识问题,得到了该问题的显式解。     

大直径缸套功率超声振动珩磨装置的研制

介绍了功率超声振动珩磨装置,它是机、电、声一体化高新技术产品,是一种提高发动机缸套表面质量的新型加工设备,这种高新技术产品的组成及结构,可以广泛应用于机动车辆行业,详细地介绍了超声波发生器、换能器、变幅杆、弯曲振动圆盘、声振系统等各组成部分的工作原理及具体的设计和应用,最后,介绍它的优点,以便引起同行的重视,使这一高新技术产品尽快实现产业化并得到广泛的应用以便促进我国的民族产业的发展,适应加入WTO的需求,增加国际竞争力.     

缓冲材料振动传递特性试验的数据采集及处理系统

通过计算机辅助进行了包装缓冲材料振动传递特性的测试。采用Visual C^ 编程首先对振动系统的激励和响应信号进行数据采集，然后对采集到的数据进行自适应噪声滤波和数据压缩，最终将两路信号的加速度在相同频率下整个周期的均方根值对应相比得出传递率。所开发的软件提供了良好的用户界面，具有非常便利的图形显示功能，提高了试验数据的精度，为缓冲包装的设计提供了依据。     

A Novel Switched Parasitic Array and Diversity Scheme Using Horizontally Polarized Linear Antennas

Switched Parasitic Arrays (SPAs) are proposed as an attractive alternative to fully adaptive arrays, due to their compact size and significantly lower cost of development. The main concept of SPAs is the deployment of switches on parasitic elements, which can be properly adjusted, in order to effectively control the radiation pattern of one active element. Conventional SPAs consist of circular arrays of vertically polarized dipoles and parasitic elements. In this paper, a novel SPA design is proposed, which is based on multiple switches employed on the body of horizontally polarized elements (one active and two parasitics). Design considerations are discussed and numerical results are illustrated. Furthermore, a simple diversity scheme is proposed, based on the novel SPA design. Superior performance of the proposed array, relative to simple non-diversity reception schemes, is indicated by simulation results. Stelios A. Mitilineos was born in Athens, Greece, in 1977. He received the Diploma in electrical and computer engineering from the National Technical University of Athens (NTUA), Greece, in October 2001. He is currently working towards his Ph.D. degree in electrical engineering at the same university. His research interests include antennas and propagation, smart antennas and mobile communications, channel estimation and location detection algorithms, MIMO systems and microwave components. Anna E. Andreoudi was born in Thessalonica, Greece, in 1977. She received the Diploma in electrical and computer engineering from the National Technical University of Athens, in 2004. Her research interests include electromagnetic waves propagation and scattering, antenna design and adaptive arrays, wireless communications and wireless mobile networks. Christos N. Capsalis was born in Nafplion, Greece in 1956. He received the Diploma in electrical and mechanical engineering from the National Technical University of Athens in 1979 and the B.S. degree in economics from the University of Athens in 1983. He obtained the Ph.D. degree in electrical engineering from NTUA in 1985. He is currently a Professor at the department of Electrical and Computer Engineering in NTUA. His current scientific activity concerns satellite and mobile communications, antenna theory and design, and electromagnetic compatibility.     

直线振动输送机极限输送速度的研究

给出了直线振动输送机的理想振动形式。理论分析表明，物料平均输送速度不能突破ｇｋ２－１／（２ｆ）这一极限。     

旋振筛的动力学分析及物料输送规律研究

对旋振筛进行动力学和运动学分析，得出振筛筛面空间运动轨迹是一条椭圆曲线，并对筛面上物料运动情况进行了研究，得到物料运动轨迹近似于一条螺线。通过实验测试验证了理论分析与实验结果的一致性。