加固后双曲拱桥有限元分析与试验研究

对一采用异型截面拱加固法加固的双曲拱桥进行有限元分析和试验研究,从理论上验证该加固方法的有效性和合理性.在总结已有研究成果的基础上,利用ANSYS分析软件中实体单位对加固后的双曲拱桥进行有限元模拟,假设新老混凝土结合面不产生滑移,且能够共同参与受力.通过计算结果与试验测量值进行对比,证明ANSYS软件中实体单元分析加固后双曲拱桥的可行性.     

温度对共轨柴油机起动性能的影响

以Bosch第2代高压共轨燃油喷射系统为基础,建立了高压共轨试验测控系统.研究了进气温度和冷却液温度对高压共轨柴油机起动时间和排放性能的影响规律.试验结果表明,在不同起动油量和不同主喷油提前角条件下,进气预热有利于缩短起动时间、降低排放;在起动时间一冷却液温度曲线和HC排放-冷却液温度曲线上均存在最佳冷却液温度点,该点的起动性能最好.     

丰田锐志2．5发动机怠速不稳故障分析与排除

电喷发动机怠速不稳,容易导致发动机熄火和车辆振动。本文以一辆丰田锐志2．5轿车怠速不稳为例,从怠速控制的功能、构造和工作原理出发,介绍故障诊断与排除方法,并分析其故障原因。     

浅谈新形势下高职院校图书馆的读者服务工作

高职院校图书馆读者服务工作要适应时代的发展,不但要加快图书馆的馆舍、设备、馆藏建设,更重要的是要有全新的服务理念,对读者进行文献信息意识的培养和应用能力的教育,不断提高读者服务工作质量．     

龙门吊起升机构制动失效原因分析及整改

我公司现有岸桥11台,龙门吊36台。龙门吊主要集中在住友和诺尔两个品牌上,同一品牌的龙门吊,其规格型号随着时间的推移以及技术上的更新而略有差异。     

吊具旋锁机构几进几出故障机理分析及防治对策

集装箱装卸桥在作业过程中,吊具旋锁机构动作频繁,故障概率高,本文详细讨论了旋锁机构产生故障的原因并进行分析,提出相应的防治对策。     

Solving service selection problem based on a novel multi-objective artificial bees colony algorithm

Service computing is a new paradigm and has been widely used in many fields. The multi-objective service selection is a basic problem in service computing and it is non-deterministic polynomial (NP)-hard. This paper proposes a novel multi-objective artificial bees colony (n-MOABC) algorithm to solve service selection problem. A composite service instance is a food source in the algorithm. The fitness of a food source is related to the quality of service (QoS) attributes of a composite service instance. The search strategy of the bees are based on dominance. If a food source has not been updated in successive maximum trial (Max Trial) times, it will be abandoned. In experiment phase, a parallel approach is used based on map-reduce framework for n-MOABC algorithm. The performance of the algorithm has been tested on a variety of data sets. The computational results demonstrate the effectiveness of our approach in comparison to a novel bi-ant colony optimization (NBACO) algorithm and co-evolution algorithm.     

A generalized self-consistent model for interfacial debonding behavior of fiber reinforced rubber matrix sealing composites

This paper presents an experimental and numerical study of short-fiber-reinforced rubber matrix sealing composites(SFRC). The transverse tensile stress-strain curves of SFRC are obtained by experiments. Based on the generalized self-consistent method, a representative volume element(RVE) model is established, and the cohesive zone model is employed to investigate the interfacial failure behavior. The effect of interphase properties on the interfacial debonding behavior of SFRC is numerically investigated. The results indicate that an interphase thickness of 0.3 μm and an interphase elastic modulus of about 502 MPa are optimal to restrain the initiation of the interfacial debonding. The interfacial debonding of SFRC mainly occurs between the matrix/interphase interface,which agrees well with results by scanning electron microscope(SEM).     

青藏高原山地公路建设应注意的几个问题

结合实践,列出在青藏高原进行公路建设应注意的事项,并简要说明解决的相应处理措施.     

宁波常洪隧道干坞施工技术

结合宁波常洪沉管隧道干坞施工，阐述了干坞大堤加固，土方开挖，边坡护坡，基坑排水，基底处理和坞墩施工等施工工艺和关键技术要点。