轨道弹性减振器试验方法的研究

轨道弹性减振器是线路减振最有效的方法之一,国外已经进行了广泛研究和应用,而国内还处于推广使用和研究的初级阶段,没有成熟和标准的试验方法。总结了压缩型轨道减振器的各种性能的试验方法,包括刚度和变形、垂向升举、横向约束、纵向约束、疲劳、低频动刚度等试验。与其它隔振系统相比,轨道减振器具有体积小、重量轻、隔振效果好以及可施工性好和可维护性好等优点。     

某车型悬置支架模态仿真与优化设计

悬置支架作为悬置系统中的重要部件,其模态性能的高低对于整个悬置系统很关键。文章基于Optistruct软件的拓扑优化算法得到一种悬置支架的优化设计,在提高模态性能的同时,实现了结构的轻量化。对悬置支架设计开发的指导,有非常重要的意义。     

某柴油机SCR系统CFD仿真分析

排放法规的日趋严格,柴油机尾气后处理器SCR作为处理NOX排放物的一种有效手段,吸引了越来越多的目光的关注。柴油机尾气后处理器SCR内部的气体流动状况及尿素喷射效果与其使用效率以及柴油机的动力性和经济性都有很大的影响。文章通过建立三维SCR流动和喷雾计算模型,计算得出SCR内部压力、流场分布以及尿素喷射雾化分布情况。通过本次仿真,找到内部影响SCR工作效率的关键设计因素,从而更好的优化产品设计,满足性能及一致性的要求。结果表明:柴油机尾气后处理器SCR内部孔道的分布对于性能有一定的影响,需要通过生产进行控制从而满足尾气后处理的效率及产品一致性要求。     

深水球形接头密封的结构设计和性能分析（英文）

To overcome the current difficulties of high-precision machining and the high manufacturing and maintenance costs of spherical seals for deep-water drilling ball joints, a new spherical seal technique is proposed in this paper. The spherical seal is mainly composed of silicone rubber and polytetrafluoroethylene(PTFE). Rational structural design makes the seal independent from the ball and other components, making it easy to replace if leakage occurs at its surface. PTFE can elastically deform over a certain deformation range, which guarantees that two sealing surfaces fit tightly together. O-Ring and PTFE elasticity makes up for any lack of accuracy during spherical machining and decreases the machining precision requirements for spherical surfaces. Using a finite element technique and nonlinear theory, the performance of the spherical seal under the influence of various factors is determined. The results show that the spherical seal designed in this paper exhibits excellent sealing performance under lowtemperature and high-pressure conditions. The spherical seal, a combination of an O-ring and PTFE, has the advantages of cheap manufacturing and maintenance costs and excellent sealing performance.     

Structural Design and Performance Analysis of a Deep-Water Ball Joint Seal

To overcome the current difficulties of high-precision machining and the high manufacturing and maintenance costs of spherical seals for deep-water drilling ball joints, a new spherical seal technique is proposed in this paper. The spherical seal is mainly composed of silicone rubber and polytetrafluoroethylene (PTFE). Rational structural design makes the seal independent from the ball and other components, making it easy to replace if leakage occurs at its surface. PTFE can elastically deform over a certain deformation range, which guarantees that two sealing surfaces fit tightly together. O-Ring and PTFE elasticity makes up for any lack of accuracy during spherical machining and decreases the machining precision requirements for spherical surfaces. Using a finite element technique and nonlinear theory, the performance of the spherical seal under the influence of various factors is determined. The results show that the spherical seal designed in this paper exhibits excellent sealing performance under low-temperature and high-pressure conditions. The spherical seal, a combination of an O-ring and PTFE, has the advantages of cheap manufacturing and maintenance costs and excellent sealing performance.     

基于相空间重构的冻土路基变形预测

应用最大Lyapunov指数预测多年冻土路基变形,分析冻土路基变形的相空间重构方法和不同延迟时间及嵌入维数对最大Lyapunov指数的影响。发现当延迟时间为1,嵌入维数为5时,最大Lyapunov指数趋于稳定,其值为0．00528。运用该指数,进行冻土路基变形预测,比较预测变形量和实测变形量,得到最大相对误差为0．749％,最小为0．135％。结果表明最大Lyapunov指数能够较好地反映冻土路基变形的混沌特征,利用其进行冻土路基变形预测是可行的。     

基于实时数据的港口电能分析系统

1秦皇岛港电能计量现状秦皇岛港现用电能计量系统的主要功能是电能计费,电能计量数据来自各单位每月上报的《电能消耗统计表》,它是按照电力公司的收费数据填写的,这个数据包含了损耗数据,不是实际发生的电耗（见图1）。现用电能计量系统存在以下问题：     

粉沙质海岸港口航道骤淤防治标准研究

介绍粉沙质海岸界定标准中的泥沙中值粒径参数值,以及粉沙质海岸不同类型划分。结合港口航道淤积特点,提出粉沙质海岸港口航道泥沙骤淤防治设计标准问题;将重现期概念应用于骤淤统计,以此衡量骤淤的强弱;同时,对骤淤重现期的合理防治标准进行论证,给出建议标准值。     

浅谈天津港的纳泥区与泥土利用问题

天津港作为需要常年进行航道、泊位清淤维护的港口,在新建、改建项目实施的同时,应尽快考虑解决能较长期保证清淤维护需要的纳泥区问题。本研究结合天津港南疆港区和北疆港区泊位的清淤纳泥区现状,探讨解决港口纳泥区的必要性,并提出清淤泥土开发利用的建议。     

基于层次分析法的舰船电力系统设计方案决策

文中介绍了一种利用层次分析法进行舰船电力系统设计方案决策的方法。利用层次分析法建立舰船电力系统设计方案决策模型,综合考虑设计方案的经济性、可行性、可靠性、安全性、可维修性等指标,并对设计方案的各项指标进行量化,寻找最优设计方案,为电力系统设计方案决策提供依据。