某输电线路工程滑坡特征分析与评价

某750 kV输电线路部分段走径于天水地区滑坡区段,区域滑坡类型主要以黄土滑坡和黄土-泥岩接触面滑坡为主,最易滑坡坡度在20°~39°之间,占全部滑坡的72.3%;滑坡的形成原因主要有地质构造、地震作用、岩性特征、地形地貌、水文气象条件和人类活动等多个方面;通过分析地区滑坡特征,采取滑带土进行室内试验,分析滑带土物理力学性质,进行典型滑坡的稳定性分析与评价。     

地形探测器接地压力对铣刨机切深精度影响的ANFIS预测

基于自适应神经网络模糊推理系统(ANFIS),利用铣刨机切深精度测定试验获得的样本数据,建立了地形探测器限深轮接地压力、铣刨深度与铣刨机切深精度之间的映射关系,并进行了验证试验,结果表明了该预测方法的有效性,同时,也为不同铣刨深度下限深轮接地压力的选择提供了依据。     

工程车辆双桥油气悬架性能对比仿真分析

通过分析全路面起重机双桥油气悬架组的液压系统油路图,建立双桥油气悬架组的7自由度数学模型,分析并联式和独立式双桥油气悬架模型主要区别,并利用AMESim仿真软件建立并联式和独立式双桥油气悬架仿真模型。对比分析了两种悬架系统的压力、轮胎动载荷、垂直加速度等参数的最大值,得出并联式悬架组的性能指标要优于独立双桥悬架的结论。     

形胜：一种山河大地景观的构建模式 ——以晋、陕、豫黄河形胜营造为例

晋、陕、豫黄河沿岸地区具有深厚的黄河形胜文化积淀,造就了乾坤湾、黄帝铸鼎原、舜都蒲坂、黄河禹门、汾阴古脽、中流砥柱、黄河九曲等一系列著名的黄河形胜,反映出一套以黄河"险要地形""精妙形局""关键形势"等价值为导向的形胜发掘与营造体系。探析了黄河形胜的山水地理特征,诠释了"此在空间"下,形胜山水"形象""形局""形势"的"三形"构建机理,梳理了形胜营造的共性规律,总结了形成黄河形胜空间的原型范式。     

面向复杂地形应用的星载SAR成像能力仿真分析

针对复杂地形对星载合成孔径雷达(synthetic aperture radar,SAR)成像产生较大影响的问题,提出一种顾及目标区域地形参数的卫星成像时长估算方法。利用3维仿真软件进行模拟分析,编程实现目标区域地形因素对雷达成像影响的仿真分析。结果表明：该方法可有效提高星载SAR成像时长解算精度,为优化目标成像进行轨道调整设计提供重要依据。     

Simulation research on the influence of eroded primary key strata on dynamic strata pressure of shallow coal seams in gully terrain

In Huojitu Coal Mine of Shendong mining area,the dynamic strata pressure (DSP) accidents occurred when the working faces passed the gully terrain,Focusing on this problem,we used physical simulation ex...     

Development of a simulation model for a three-dimensional wind velocity field using Ténès Algeria as a case study

A mathematical simulation model was developed that can determine the three-dimensional wind velocity field over a complex terrain. The Ténès area in the Valley of Cheliff in Algeria was used as a case study. This region is exposed to south-west circulation that makes it favorable to the use of wind energy. Knowledge of wind fields is crucial for predicting the dispersion of pollutants, for forecasting meteorological weather, for fire spread prediction and in the design and implementation of wind turbines. By means of a mass consistent model, an in-house program was developed to calculate the three-dimensional wind velocity field in the study region. The model was supported by a numerical box in which flow through is allowed for in the upper and lateral boundaries. The bottom boundary through which no flow through occurs was determined by the topographic relief at the surface. From measured wind velocities, observed values were calculated by interpolation-extrapolation. Using an optimization method, the adjusted velocities were obtained from constraints, observed velocities and the continuity equation. The model was verified with wind point data, the relative error did not exceed 6%.     

一种地形地物匹配式禁射控制方法

一种新的地形地物匹配式禁射控制方法：在射击准备时，炮手瞄准地形地物轮廓转动火炮，在地形地物左右边界处要向外移到角量，适时按下录取确认按钮，控制炮位计算机采集随动控制器实时发送的火炮方位角和射角；射击时，炮位计算机完成解算诸元后，根据禁射界判断是否禁射，向击发装置输出禁射控制信号。禁射界录取过程中，在有无地形地物遮蔽分界处，应将采集间隔加密，以提高禁射界精度。     

Meteorological wind energy potential in the Alps using ERA40 and wind measurement sites in the Tyrolean Alps

The peculiarities of meteorological wind potential in alpine settings compared to flatland and offshore sites are studied. Four data sources are used: Global reanalysis ERA40 from ECMWF, long‐term stations in the Tyrolean Alps, spatially dense measurements near the best site and Doppler sodar wind profiles. Due to the decrease of density with height, alpine sites suffer from a nearly linear decrease of harvestable power with altitude, which is more than offset by the increase of wind speed at altitudes above 1.5 km MSL. ERA40 data show higher potential on the northern than on the southern side of the Alps. The best locations are not isolated peaks but ridges within wide orographic channels. The best potential sites in the Tyrolean part of the Alps have median wind speeds of up to 7.1 m s^?1 and extractable potentials between 2900 and 1600 kWh per year and per square meter of rotor area. The profile of horizontal wind speed at ridge sites is often not logarithmic but approximately constant within the height of a wind turbine due to a (nearly) complete absence of upwind fetch. Also, the turbulence intensity is independent of height. Icing can cause considerable downtimes. Copyright © 2010 John Wiley & Sons, Ltd.