斜井盾构栽头及推力配置研究

斜井盾构栽头是盾构下坡掘进中出现的不良姿态,其栽头程度直接影响斜井隧道的成型质量。目前国内对于斜井盾构栽头问题研究较少,且缺乏可用于描述斜井盾构栽头的模型。此外,采用推进系统进行斜井盾构栽头调整,其推力配置主要依据人工经验,存在一定的盲目性。鉴于此,文章以内蒙古新街台格庙盾构煤矿斜井为工程背景,从盾首盾尾沉降量不一致的角度出发,建立了可用于描述斜井盾构栽头的地基反力分布模型,研究了推进系统推力配置与斜井盾构栽头程度之间的关系,获得了推进系统的临界推力配置方案。该初步研究成果可为斜井盾构栽头问题的后续研究提供一定的理论参考。

古都城市入境旅游推—拉力因素实证研究——以南京市为例

以南京市为例,在旅游市场调查的基础上,通过推—拉力因素单要素评价模型,定量研究了古都类城市入境游客的旅游动机,并通过对不同群体游客推—拉力因素的差异分析,进一步指出了旅游动机的不同因素在不同群体中的影响程度,可为古都类城市入境旅游市场拓展提供科学依据。

口岸城市国际旅游推-拉力因素实证研究——以上海市为例

以上海市为例,在对旅游市场进行调查的基础上,通过推-拉力因素单要素评价模型,定量研究了上海市国际游客的旅游动机,并通过对不同群体游客推-拉力因素的差异分析,进一步指出了推-拉力因素的不同指标在不同群体中的影响程度,可为口岸类城市国际旅游市场拓展提供科学依据。

Attitude control allocation strategy of high altitude airship based on synthetic performance optimization

This paper presents a method for solving the attitude control problem of high altitude airship (HAA) with aerodynamic fin and vectored thruster control. The algorithm is based on the synthetic optimization of dynamic performance and energy consumption of airship. Firstly, according to the system overall configuration, the dynamic model of HAA was established and the HAA linearized model of longitudinal plane motion was obtained. Secondly, using the classic PID control theory, the HAA attitude control system was designed. Thirdly, through analyzing the dynamic performance of airship with fin or vectored thruster control, the synthetic performance index function with different weighting functions was determined. By means of optimizing the obtained performance index function, the attitude control of high altitude airship with good dynamic performance and low energy consumption was achieved. Finally, attitude control allocation strategy was designed for the airship station keeping at an altitude of 22 km. The simulation experiment proved the validity of the proposed algorithm.