高层建筑房建结构设计中的风力影响与优化研究

高层建筑由于其结构高大,使得风力对其影响尤为显著,因此,风力影响成为高层建筑结构设计的重要考虑因素。本研究基于相关计算模型,深度解读了风力如何牵动高层建筑的各个细微纤维,同时寻找优化建筑的有效路径。模型仿真的过程中,清晰观察到风力如何推动建筑在侧向和顶部产生位移,对抗倾覆能力的减弱,还会带来结构脆弱现象。优化建筑设计,改善结构形态,选取适当材质,惟有此等途径,方能在不改变环境的突变下,施行应对策略。经过优化后的建筑模型,其抗风性能有显著提高,侧向位移和顶部位移的增幅大大减小,抗倾覆能力增强,结构疲劳现象得到明显改善。研究发现,综合考虑建筑结构设计的风力影响和优化策略,能够有效提升高层建筑的结构安全性和经济性。这一结论对于高层建筑房的设计具有重要的理论和实践意义。

气象因素对鞍山城市大气环境质量状况的影响

通过对不同气象条件下大气环境监测数据的分析 ,总结出气象因素对空气环境质量状况影响的规律和特点。

单发机载布撒器对机场跑道封锁效率研究

研究机载布撒器对机场毁伤效率问题,为得到不同攻击角、不同母弹CEP和子弹CEP'及不同风力影响下单发机载布撒器对机场跑道封锁效率的影响规律,分析了影响子弹药落点散布的主要原因,并在考虑有风影响的情况下建立了低空抛撒带伞子弹药质点弹道方程组与计算仿真模型。采用Monte Carlo方法进行了实例仿真计算,得到了单发机载布撒器对机场跑道的封锁效率在各单一因素影响下的变化规律,结果可为多发机载布撒器封锁整条跑道的效率评估以及机载布撒器的总体设计提供参考。

基于多粒子系统的火焰三维模拟

基于粒子系统的火焰模拟算法的缺点是所需的粒子量大,且在风力影响下粒子运动的随机性太强,导致模拟效果不逼真。将不受风力时的火焰基本运动轨迹和风力影响相叠加,来模拟多风影响下火焰表面的运动,在保证动态火焰纹理一致性和连续性的同时,减少粒子数量,提高渲染实时性,并实现了风的参数的人为控制,增强了模拟效果的逼真度和在不同场景下的适应性。

The inter-annual variability of the Yellow Sea Warm Current surface axis and its influencing factors

Based on the Pathfinder sea surface temperature(PFSST),the surface axis and its pattern of the Yellow Sea Warm Current(YSWC) are discussed.A structure of double-warm-tongue is found in February and it varies in different years.Two indexes are calculated to represent the westward shift(WSI) and northward extension(NEI) of the warm water in the Yellow Sea(YS).Wavelet analysis illustrates that the WSI and NEI have prominent periods of 3-6 years and 3-4 years,respectively.The Empirical Orthogonal Function(EOF) decomposition is applied to the winter wind stress curl and the Kuroshio Current(KC) transport,which are believed to play important roles in forcing the variability of the YSWC surface axis.Statistics shows that the WSI is significantly related with the second EOF mode of the wind stress curl in February,which may force the YSWC surface axis moving westward and maintaining the double warm tongues because of its opposite curl in the YSWC domain.The first EOF mode of wind stress curl in January is propitious for inducing the warm tongue in the YS to advance more northward.Hence,the wind stress curls both in January and in February could force variations of the YSWC surface axis;however,the effect of the January wind stress curl is relatively weaker than that of the February.The relationship between the NEI and the KC transport is remarkable,and it seems that the stronger KC supplies more power to push the YSWC northward against the southward wind.

Research and Application of Probability Distribution of Wind Power Fluctuation Characteristics

The fluctuation characteristics is the inherent property of wind power.Through analysis of a large number of wind t＇anns based on measured data,we find it describes the best probability distribution of wind power fluctuation for the mixed Gauss distribution of two components,and try to carry out the physical interpretation of two components.Further discussion is between the probability distribution of fluctuating wind power time difference and whole relationship.It is found that the two have basic similarity.Through comparing the different time level data quantified losses the information of wind power fluctuation,quantitative determination of the degree of impact prediction.We can summarize and understand of wind power fluctuation,constructing instance from the wind farm construction and monitoring prediction two aspect recommendations to overcome the adverse effects of wind power fluctuations on the power grid operation.

常见的浮漂信号反应及应对方法

1.抛竿后,按理数秒钟后浮漂受铅坠重力影响会慢慢立直,但在应立直时还平浮躺着不动,这一般是小鱼在中上层接住钩饵(排除钩坠、线被水草等托住),应及时扬竿。2.浮漂立直,漂尾露出水面稳定二目,不时冉冉上升一目或半目后又缓慢沉到二目。这是鱼在钩饵周围吃食、活动引起水流水压变化,不是鱼儿咬钩,不可扬竿。但说明这时浮漂感觉好,很敏感。3.浮漂稳定“钓二目”时,先发现徐徐上升一目左右,而后短促有力一顿。

海竿钓大风天好方法——竿尖向风斜插竿

大风天气如何打好竿、钓好鱼,我经历了几年艰苦的探索过程。开始,遇到大风天气,我总是尽量把海竿插平,虽然风力影响降低了些,但仍不能从根本解决问题。因为鱼竿、渔线和钓饵都在一条直线上,无论渔线拉紧不拉紧,只要几阵疾风,竿子来回摆动几次,渔线就弯得很厉害。拉动了鱼钩使之与鱼饵分离。

A study on performance influences of airfoil aerodynamic parameters and evaluation indicators for the roughness sensitivity on wind turbine blade

The roughness increase on horizontal axis wind turbine(HAWT) blade surface,especially on the leading edge,can lead to an aerodynamic performance degradation of blade and power output loss of HAWT,so roughness sensitivity is an important factor for the HAWT blade design.However,there is no criterion for evaluating roughness sensitivity of blade currently.In this paper,the performance influences of airfoil aerodynamic parameters were analyzed by the blade element momentum(BEM) method and 1.5 MW wind turbine blade.It showed that airfoil lift coefficient was the key parameter to the power output and axial thrust of HAWT.Moreover,the evaluation indicators of roughness sensitivity for the different spanwise airfoils of the pitch-regulated HAWT blade were proposed.Those respectively were the lift-to-drag ratio and lift coefficient without feedback system,the maximum lift-to-drag ratio and design lift coefficient with feedback system for the airfoils at outboard section of blade,and lift coefficient without feedback,maximum lift coefficient with feedback for the airfoils at other sections under the pitch-fixed and variable-speed operation.It is not necessary to consider the roughness when HWAT can be regulated to the rated power output by the pitch-regulated and invariable-speed operation.

Factors Affecting Small Axial Cooling Fan Performance

Many factors such as outer diameter, hub ratio, blade numbers, shape and stagger angle affect the performance of small cooling fans. A small cooling fan was simulated using CFD software for three blade stagger angles （30.5°, 37.5°, 44.5°）and obtained the internal flow field and the static characteristics. Research indicated that the stagger angle has an obvious effect on the static characteristics of a fan. For flow rates below 0.0104 mVs, total pressure is the greatest when the stagger angle is 37.5°; flow rates higher than 0.0104 m^3/s, the total pressure is greatest when the stagger angle is 44.5° For the same flow rates, the velocity at inlet of pressure surface increases with in- creasing stagger angle, but the change of velocity on the suction surface is very small. For one model, vortices and the speed of revolution surfaces decrease with tip clearance increasing. But for other three models, increasing the stagger angle, the vortex intensity and speed of revolution surfaces at same height tip clearance increases, simultaneously, the position of vortex offset from the top of the rotor blade to the suction surface.