低阻通风船体的远程控制测试平台开发（英文）

This paper addresses the development and testing of a remotely controlled boat platform with an innovative air-ventilated hull. The application of air cavities on the underside of ship hulls is a promising means for reducing hydrodynamic drag and pollutant emissions and increasing marine transportation efficiency. Despite this concept’s potential, design optimization and high-performance operation of novel air-cavity ships remain a challenging problem. Hull construction and sensor instrumentation of the model-scale air-cavity boat is described in the paper. The modular structure of the hull allows for easy modifications, and an electric propulsion unit enables self-propelled operation. The boat is controlled remotely via a radio transmission system. Results of initial tests are reported, including thrust, speed, and airflow rate in several loading conditions. The constructed platform can be used for optimizing air-cavity systems and testing other innovative hull designs. This system can be also developed into a high-performance unmanned boat.     

泸溪沅水大桥主桥连续箱梁挂篮悬浇施工介绍

结合泸溪沅水大桥施工工程实例,介绍了挂篮施工方案,技术要点及注意事项等。     

调车内燃机车用TK18B-57型涡轮增压器

介绍了TK18B-57型涡轮增压器的技术特点;得出了装用该型增压器的8ДМ-21/21型柴油机的试验结果;给出了柴油机流体特性及在所有工况下的参数变化图表.     

140 km/h大吨位集装箱平车的制动系统

介绍了最高运行速度可达140 km/h的"快速"大吨位集装箱平车制动试验的过程和结果,提出了改进这种远景平车制动系统的建议.     

使用有限元分析以改善重载运输车轴

分析了北美铁路货运发生的车轴故障,介绍了使用有限元对F级和K级车轴进行应力分析计算,研究车轴尺寸变化对应力的影响,并提出了改善重载车轴设计的建议.     

CA-3型自动车钩装置钩尾销的疲劳寿命

介绍了俄罗斯4家工厂生产的CA-3型自动车钩钩尾销的试验台试验结果,并指出为提高运行安全性,有必要采用钩尾销疲劳特性的规范要求.     

机车轴承部件车载诊断系统

文内介绍了以АРП-11型轴承寿命分析仪为基础的机车轴承部件车载诊断系统的作用、结构和使用结果。     

ISS-based robust adaptive fuzzy algorithm for maintaining a ship's track

This paper focuses on the problem of linear track keeping for marine surface vessels. The influence exerted by sea currents on the kinematic equation of ships is considered first. The input-to-state stability(ISS) theory used to verify the system is input-to-state stable. Combining the Nussbaum gain with backstepping techniques,a robust adaptive fuzzy algorithm is presented by employing fuzzy systems as an approximator for unknown nonlinearities in the system. It is proved that the proposed algorithm that guarantees all signals in the closed-loop system are ultimately bounded. Consequently,a ship's linear track-keeping control can be implemented. Simulation results using Dalian Maritime University's ocean-going training ship 'YULONG' are presented to validate the effectiveness of the proposed algorithm.     

基于LM算法神经网络的PMSM转子位置估算

针对永磁同步电机控制中传统机械传感器容易故障或失效,常规无传感器转子位置估计方法实现复杂、计算量大、易受干扰等问题,提出了基于LM算法神经网络的永磁同步电机转子位置估算器.通过采集两相静止坐标系下电压、电流以及与转子位置相关联的数据集来创建估算器模型,针对标准BP神经网络算法收敛速度慢、效率低的问题,将采用LM算法对数...     

新型沥青路面结构设计研究及工程应用

文章通过对新型组合式基层沥青路面的设计研究与实际工程应用,论证新型组合式基层沥青路面结构在江苏省高速公路建设中的适用性,得出以下主要结论:新型组合式基层沥青路面结构为改性沥青SMA13+改性沥青Sup20+道路石油沥青LSM25+水稳基层;沥青碎石基层LSM25在60℃温度下动稳定度可达2 676次/mm,并且拥有较好的抗压性能与抵抗拉伸变形的能力;LSM混合料层的"疲劳极限"约为70με。