适应万吨级列车的车站信号工程设计与施工中特殊问题的解决

提出万吨级列车车站改造工程中信号设计需要解决的几个技术问题,并给出了新型站内电码化电路,这些电路在施工与运营中得到应用与验证,电路符合设计要求而且安全可靠。     

DEADBEAT COVARIANCE CONTROLLER DESIGN FOR SAMPLED-DATA SYSTEMS

ＭＰＬＥＤ－ＤＡＴＡ ＳＹＳＴＥＭＳTX＠霍沛军＠王子栋ＩｎｔｒｏｄｕｃｔｉｏｎＳａｍｐｌｅｄ－ｄａｔａｆｅｅｄｂａｃｋｃｏｎｔｒｏｌｈａｓｒｅｃｅｉｖｅｄｍｕｃｈａｔｅｎｔｉｏｎｉｎｔｈｅａｒｅａｏｆｃｏｎｔｒｏｌｓｙｓｔｅｍｄｅ－ｓｉｇｎｂｅｃａｕｓｅｏ...     

PSPC在船舶建造中的应用研究

通过对涂层性能新标准(PSPC)的分析和研究,在船舶建造的前期策划过程中,从船舶设计、工法设计、生产管理等各方面,分解涂层性能新标准(PSPC)各项要求到各个工序,再通过现场施工检验,进一步优化整个实施体系。     

船舶航向模糊控制系统的设计

提出了一种改进的船舶航向模糊控制方法,将航向改变模糊控制器和航向保持模糊控制器有机地结合起来,同时在航向保持模糊控制器的输出端叠加了一个积分作用,提高了航向保持过程中的静态精度。仿真结果表明,无论是在静水环境中还是在不同风和流干扰的环境中,这种改进的航向模糊控制器都比常规的模糊控制器具有更好的控制效果,能够满足船舶航向实时控制的要求。     

桩板结构路基的动力响应分析

桩板结构路基-无砟轨道结构是一种相对较新的结构。因此,结合变形控制条件对桩板结构的匹配和动力特性进行数值模拟分析是很有意义的。本文通过动力响应包括动变形、动应力和基面加速度等分析,讨论地基处理的范围和深度、桩端持力层的刚度等问题。研究表明,增大桩径和增大桩端持力土层的承载力或刚度均是降低变形的有效措施。根据断面竖向变形的影响范围,通过对承台两侧宽5 m、深10 m范围内的地基进行处理,对于减少变形是有效的。此外,本文提出的桩板结构-无砟轨道路基横断面尺寸可供设计参考。     

桥梁结构砼外观质量控制技术

文章针对影响桥梁结构混凝土外观质量的常见问题,分析其产生的原因,介绍了桥梁施工中混凝土外观质量的控制方法.     

论建筑施工企业经营及其项目管理的重要性

随着市场经济的发展,建筑施工企业面临着激烈的市场竞争,企业能否在市场竞争中立于不败之地,关键在于企业能否为社会提供质量高、工期短、造价低的建筑产品。由此可见项目的成本管理成了项目施工管理的核心内容。     

Fault-tolerant control of heavy-haul trains

The fault-tolerant control (FTC) of heavy-haul trains is discussed on the basis of the speed regulation proposed in previous works. The fault modes of trains are assumed and the corresponding fault detection and isolation (FDI) are studied. The FDI of sensor faults is based on a geometric approach for residual generators. The FDI of a braking system is based on the observation of the steady-state speed. From the difference of the steady-state speeds between the fault system and the faultless system, one can get fault information. Simulation tests were conducted on the suitability of the FDIs and the redesigned speed regulators. It is shown that the proposed FTC does not explicitly worsen the performance of the speed regulator in the case of a faultless system, while it obviously improves the performance of the speed regulator in the case of a faulty system.     

A novel fuzzy logic correctional algorithm for traction control systems on uneven low-friction road conditions

The traction control system (TCS) might prevent excessive skid of the driving wheels so as to enhance the driving performance and direction stability of the vehicle. But if driven on an uneven low-friction road, the vehicle body often vibrates severely due to the drastic fluctuations of driving wheels, and then the vehicle comfort might be reduced greatly. The vibrations could be hardly removed with traditional drive-slip control logic of the TCS. In this paper, a novel fuzzy logic controller has been brought forward, in which the vibration signals of the driving wheels are adopted as new controlled variables, and then the engine torque and the active brake pressure might be coordinately re-adjusted besides the basic logic of a traditional TCS. In the proposed controller, an adjustable engine torque and pressure compensation loop are adopted to constrain the drastic vehicle vibration. Thus, the wheel driving slips and the vibration degrees might be adjusted synchronously and effectively. The simulation results and the real vehicle tests validated that the proposed algorithm is effective and adaptable for a complicated uneven low-friction road.     

Development of advanced driver assistance systems with vehicle hardware-in-the-loop simulations

This paper presents a new method for the design and validation of advanced driver assistance systems (ADASs). With vehicle hardware-in-the-loop (VEHIL) simulations, the development process, and more specifically the validation phase, of intelligent vehicles is carried out safer, cheaper, and is more manageable. In the VEHIL laboratory, a full-scale ADAS-equipped vehicle is set up in a hardware-in-the-loop simulation environment, where a chassis dynamometer is used to emulate the road interaction and robot vehicles to represent other traffic. In this controlled environment, the performance and dependability of an ADAS is tested to great accuracy and reliability. The working principle and the added value of VEHIL are demonstrated with test results of an adaptive cruise control and a forward collision warning system. On the basis of the ‘V’ diagram, the position of VEHIL in the development process of ADASs is illustrated.