小区开放对道路通行影响研究

指出了在快速发展的时代,存在小区封闭导致的交通堵塞问题。通过对小区开放选取合适的指标,运用模糊综合评价法对小区开放建立了数学模型。通过定义各个指标的功效系数和隶属度,利用模糊统计方法计算了各个指标的权重值,进而计算综合评价值,并对片块式布局和围合式布局两种不同类型小区开放前后对周边道路通行产生的影响进行了评价,最终结合各个类型小区评价结果对小区开放给出了一些合理化的建议。

行车荷载对路基路面影响分析

路基、路面的服务对象是汽车，其主要功能是保证车辆平稳、安全、快速地通行。造成路基、路面结构损伤的主要原因是汽车荷载。所以，为保证路基、路面达到预定的功能，具有良好的结构性能，应对行驶中汽车进行系统分析，包括汽车轴载与轮载的大小与特性；在设计期限内，车辆通行量逐年变化的规律以及汽车轴型的分布；汽车的动态与静态荷载特性比较等。

Carbon dioxide levels and ventilation for running vehicle

Factors contributing to ventilation quantity of the vehicle are ventilation modes, cabin characteristics and vehicle speeds. CO2 levels were investigated under different speeds and ventilation modes. Four modes were selected： A： vent closed and fan shut, B： vent closed and fan started, C： vent opened and fan shut, D： vent opened and fan started. In vent closed modes, CO2 levels reached several thousands of ppm in few minutes at any speeds. For mode C, CO2 levels exceeded the guideline at low speeds 50 km/h, while it reduced below one at higher speeds 80 km/h. Fan has no significant impact on ventilation during vent closed. The ventilation efficiency in each mode increased with the speed raising. To determine the ventilation rate of running vehicle, the experiment was implemented by using CO2 emitted from driver and passengers as tracer gas. Ventilation rate for the different modes and speeds were calculated.