基于频响函数法的海水泵动载荷对隔振系统影响分析

为掌握海水泵运行时对隔振系统的影响,本文采用传递函数计算方法,利用实际海水泵的参数及实测得到的隔振元件机械阻抗参数,针对轴系海水系统海水泵的运行参数进行模拟计算。计算结果表明,海水泵运行会对隔振系统产生一定的位移影响,但不会影响隔振系统隔振效果的发挥。     

内河船舶嵌入式网关系统设计

随着内河智能航运技术的发展,迫切需要将内河船舶下层现场总线的数据与以太网进行有效的信息交互。文章从CAN总线与以太网通信的特点出发,设计出一种用于内河船舶嵌入式网关,实现CAN总线与以太网之间的无障碍数据通信,构成船舶运行与货物状态信息网络,为内河船岸信息交互提供基础平台。     

超高性能混凝土在桥梁工程中的应用

超高性能混凝土(UHPC)是一种新型高性能水泥基复合材料,具有超高的耐久性和力学性能。UH-PC在桥梁工程中的应用,可优化桥梁结构尺寸、增大跨径,在增加承载力、耐久性和寿命周期的同时保持较小的变形。但由于原材料质量和配比的差异及大型搅拌设备不成熟等因素,连续制备性能较好的UHPC难度较大,同时相关桥梁设计规范较不完善和实践指导设计的经验较少,另外严格的养护制度制约了桥梁施工方法的灵活选择,导致目前UHPC不能在桥梁中广泛应用。为了促进UHPC大规模应用,简要介绍加拿大和美国2座UHPC桥梁应用情况。随着UHPC制备技术的进步、设计理论的完善,其必将在桥梁中得到广泛应用。     

Particle Filter and Its Application in the Integrated Train Speed Measurement

Particle filter(PF) can solve the problem of state estimation under strong non-linear non-Gaussian noise condition with respect to traditional Kalman filter(KF) and those improved KFs such as extended KF(EKF) and unscented KF(UKF). However, problems such as particle depletion and particle degradation affect the performance of PF. Optimizing the particle set to high likelihood region with intelligent optimization algorithm results in a more reasonable distribution of the sampling particles and more accurate state estimation. In this paper, a novel bird swarm algorithm based PF(BSAPF) is presented. Firstly, different behavior models are established by emulating the predation, flight, vigilance and follower behavior of the birds. Then, the observation information is introduced into the optimization process of the proposal distribution with the design of fitness function. In order to prevent particles from getting premature(being stuck into local optimum) and increase the diversity of particles, Lévy flight is designed to increase the randomness of particle's movement. Finally,the proposed algorithm is applied to estimate the speed of the train under the condition that the measurement noise of the wheel sensor is non-Gaussian distribution. Simulation study and experimental results both show that BSAPF is more accurate and has more effective particle number as compared with PF and UKF, demonstrating the promising performance of the method.     

河源加快汽运企业转制

河源市政府为深入贯彻党的十六届三中全会《决定》和省九届四次会议《意见》有关加快国有企业经营结构调整，大力推进混合型所有制经济发展的精神，做强做大一批工业龙头企业，提高企业的竞争力，今年把加快市汽运企业的改制工作作为国有企业改革的重点，并力争在年内完成改制。     

无水洗车

本文叙述了传统洗车方法对汽车和环境的损害以及对水资源的浪费，同时从无水洗车液的组成和清洗机理分析了无水洗车节水和环保的特点，并将两者性能进行了比较。本文还讨论了无水洗车的优缺点及发展方向。     

提速施工组织

总结了北京铁路局在提速施工组织，施工运输组织及要点施工方面的为确保快速，高质量和安全施工所采取的措施和经验。     

塔式起重机动力特性的模态综合法分析

塔式起重机一般由几个部分构成，而每一部分往往又是一个空间桁架体系，因而，整体结构的动力特性比较复杂，本文利用模态综合法，对结构进行简化处理，求得结构的整体动力特性和各独立部分的动力特性。