依据车辆跟驰理论和面向对象程序设计思想,探讨了交通流仿真系统(traffic flows im u lation system,TFSS)开发中的一些软件技术,从符合我国城市交通实际的路网模型、交通流生成模型、跟驰模型、换车道模型和交叉口信号控制模型入手,采...依据车辆跟驰理论和面向对象程序设计思想,探讨了交通流仿真系统(traffic flows im u lation system,TFSS)开发中的一些软件技术,从符合我国城市交通实际的路网模型、交通流生成模型、跟驰模型、换车道模型和交叉口信号控制模型入手,采用二维动画的方式模拟车辆的运行,给出了软件设计思路、系统结构设计、主流程图、界面设计及应用,最后提出了开展混合交通条件下城市交通流仿真研究的方向。展开更多
The application of the vertical hoisting jack and wave motion compensation techniques to the salvage of an ancient sunken boat is introduced. The boat is wooden, loaded with cultural relics. It has been immersed at th...The application of the vertical hoisting jack and wave motion compensation techniques to the salvage of an ancient sunken boat is introduced. The boat is wooden, loaded with cultural relics. It has been immersed at the bottom of the South China Sea for more than 800 years. In order to protect the structure of the boat and the cultural relics inside to the largest extent, an open caisson is used to hold the sunken beat and the silts around before they are raised from the seabed all together as a whole. In the paper, first, the seakeeping model test of the system of the salvage barge and the open caisson is done to determine some important wave response parameters. And then a further experimental study of the ap- plication of the vertical hoisting jack and wave motion compensation scheme to the salvage of the sunken boat is carried out. In the model tests, the techniques of the integrative mechanic-electronic-hydraulic control, wave motion forecast and wave motion compensation are used to minimize the heave motion of the open caisson. The results of the model tests show that the heave motion of the open caisson can be reduced effectively by the use of the present method.展开更多
文摘依据车辆跟驰理论和面向对象程序设计思想,探讨了交通流仿真系统(traffic flows im u lation system,TFSS)开发中的一些软件技术,从符合我国城市交通实际的路网模型、交通流生成模型、跟驰模型、换车道模型和交叉口信号控制模型入手,采用二维动画的方式模拟车辆的运行,给出了软件设计思路、系统结构设计、主流程图、界面设计及应用,最后提出了开展混合交通条件下城市交通流仿真研究的方向。
文摘The application of the vertical hoisting jack and wave motion compensation techniques to the salvage of an ancient sunken boat is introduced. The boat is wooden, loaded with cultural relics. It has been immersed at the bottom of the South China Sea for more than 800 years. In order to protect the structure of the boat and the cultural relics inside to the largest extent, an open caisson is used to hold the sunken beat and the silts around before they are raised from the seabed all together as a whole. In the paper, first, the seakeeping model test of the system of the salvage barge and the open caisson is done to determine some important wave response parameters. And then a further experimental study of the ap- plication of the vertical hoisting jack and wave motion compensation scheme to the salvage of the sunken boat is carried out. In the model tests, the techniques of the integrative mechanic-electronic-hydraulic control, wave motion forecast and wave motion compensation are used to minimize the heave motion of the open caisson. The results of the model tests show that the heave motion of the open caisson can be reduced effectively by the use of the present method.
