大体积混凝土施工裂缝控制技术

大体积混凝土施工中，由于水泥水化热引起混凝土浇注内部温度和温度应力剧烈变化，由此而产生的温度应力是导致混凝土产生裂缝的主要原因。裂缝会影响混凝土的整体性、防水性和使用的耐久性，因此如何控制裂缝是混凝土施工成败的关键。本结合工程实际，分析了控制大体积混凝土施工的方法及措施，取得了良好的施工效果。     

昆明东风路立交桥动载试验分析

桥梁结构的动力特性(振型、频率和阻尼)是桥梁承载力评定的重要参数,同时也是识别桥梁结构工作性能和桥梁抗震分析的重要参数,本文通过昆明东风路立交桥的动载试验,分析桥梁在不同工况下动应变、动挠度、频率和阻尼以及影响实测冲击系数的原因。对全面地评价桥梁结构有重要意义。     

高强力复合土工布在软基路堤中的应用

本文结合工程实例介绍采用高强力复合土工布处理软土地基路堤的设计、施工与应用效果     

圆柱分支管Y型三通相贯线的计算及应力集中区域

建立了圆柱分支管Y型三通的主管相贯线处的周长不变的条件 ,确定了相贯线为椭圆。给出了由已知主管相贯线处直径确定分支管直径和椭圆周长或反向求解的计算公式 ,讨论了精度。并用ANSYS程序计算确定了应力集中的区域。     

防抱制动系统不同控制方法的模拟研究

从控制器实际设计及实施的角度研究了四种比较实用的ＡＢＳ控制算法，即传统的逻辑门限控制、ＰＩＤ控制、模糊控制及滑模变结构控制。分析研究了作动系统及轮胎特性的非线性对控制系统鲁棒性及控制精度的影响，计算模拟了几种典型的ＡＢＳ工况，并对模拟结果作了分析与评价。     

网络条件下高速公路收费费率优化方法研究

以区域公路网为研究对象,在分析高速公路收费费率与交通量之间关系的基础上,建立收费费率优化双层规划模型,兼顾经营者和使用者的利益,并考虑路网交通流分布,设计了模型的实用求解算法。该方法弥补了已有方法多以运输通道为研究对象的不足之处,可以在收费系数确定的情况下根据优化目标直接得到优化结果,具有较为广泛的适用性。     

土工格栅(网)处理桥头跳车的应用

结合内蒙古境内208国道锡赛段朱日河中桥的工程实践，介绍了采用土工格栅（网）处理桥头跳车的设计施工方案以及施工中应注意的问题。     

静态爆破工艺在旧桥改造中的应用

阐述了静态爆破施工的作用机理和施工工艺,通过与常规爆破工艺相比较,论证了该工艺具有的造价低、无振动、无噪声、无粉尘、无飞石、无毒气污染等特点和其广泛的推广应用价值.     

Study on dynamic characteristics of vehicle gearbox under multi-boundary conditions

With the development of vehicle gearbox to high-power-density and high-speed, how to predict and optimize the dynamic characteristics of vehicle gearbox becomes increasingly prominent. Aiming at the vehicle gearbox, this paper comprehensively and deeply studies the dynamic characteristics under the multi-boundary conditions. The generation mechanism of the multi-source excitations triggering the gearbox vibration is analyzed firstly. The vibration transfer path of the gearbox is explored. Secondly, the engine excitation, the gear meshing excitation and the bearing support load are numerically calculated. According to the finite element method, a fluid-solid coupling finite element model of the gearbox body is established to predict the gearbox dynamic responses based on the Galerkin method and the Hamiltonian variational principle. Finally, the effects of the excitation condition, oil height and reinforcement forms on the vibration responses of the gearbox body are thoroughly studied by simulation. The analysis indicates that it not only helps to modify and improve the method of forecasting the gearbox dynamic response, and also provides the theoretical and technical guidance for the gearbox design and optimization.     

Target priority determination methods by interval-valued intuitionistic fuzzy sets with unknown attribute weights

The paper aims at the problem of multi-targets threat degree being hard to be evaluated accurately in complex air defense battlefield environments. Combined with multi-sensors information fusion and interval-valued intuitionistic fuzzy sets (IVIFS) theories, the target priority determination is studied. The score and accuracy functions of IVIFS are improved with thinking about the hesitating information in order to increase the rationality. Then, the influence factors of target priority and the nonlinear relationship between the influence factors and target priority are analyzed. Next, the algorithms for calculating the factor weights and sensor weights are given. Based on the theory of IVIFS and technique for order preference by similarity to an ideal solution (TOPSIS), two methods of target priority determination based on the IVIFS and TOPSIS are proposed. At last, an application example verifies the effectiveness and flexibility of the proposed algorithms.