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 风速模型
 wind speed model
 Nonstatioanry Wind Speed Model and Its Application in Strong Winds 强风环境非平稳风速模型及应用 短句来源 WIND SPEED MODEL FOR DYNAMIC SIMULATION OF WIND POWER GENERATION SYSTEM 风力发电系统动态仿真的风速模型 短句来源 This paper analyzes and compares two parameters Weibull distribution 、 three parameters Weibull distribution、 Rayleigh distribution. In this paper, The proposed wind speed mathemastic model is introduced which is composed of the base wind speed model, the gust wind speed model, the ramp wind speed model and the noisy wind speed model. 本文分析比较了几种常用的风速分布模型:双参数Weibull分布风速模型、三参数Weibull分布风速模型、Rayleigh分布风速模型,并简单总结了各种风速模型中参数的估计方法。 短句来源 As the wind conditions impact largely on performance of the wind power generation systems, wind speed model is important in simulation of the systems. 风速状况对风力发电系统的性能有着重要的影响,也使得风速模型成为风力发电系统仿真模型的重要部分。 短句来源 The main works of this thesis are: (1) An equivalent wind speed model is established in this thesis considering the effect of tower shadow and wind shear, and the torsion oscillation caused by the gravity deviation between different blades is analyzed. 主要研究内容包括: (1)建立了考虑塔影效应和风剪切作用后的等效风速模型,并且对叶片重力偏差造成的风电机组转矩波动进行了理论分析。 短句来源 更多
 wind model
 In Chapter 2, the principle of wind energy generation is analyzed in detail, while the structure of wind turbine systems is modeled, including the wind model, wind wheel model, the power control strategy, the drive model, etc. Also, the models of induction generator, synchronization generator and converter are simply introduced. 其次在第2章中详细阐述风力发电原理,分析风力发电的系统结构,建立风速模型、风轮模型、传动部分模型,讨论不同风况下风力机组的控制方式,并简要回顾了异步发电机模型、同步发电机模型以及常见的换流器模型。 短句来源
 “风速模型”译为未确定词的双语例句
 With the theory of vehicle-dynamics,the model of critical vehicle turnover wind speed is established and the critical vehicle turnover wind speed,danger vehicle turnover wind speed and speed limit of train of frozen districts and non-frozen districts on the elevation of 3 000 m and 4 000 m are calculated. 利用车辆动力学原理建立列车临界翻车风速模型,分别计算青藏铁路海拔3 000 m和4 000 m冻土和非冻土地区的临界翻车风速和危险翻车风速,以及给定风速条件下车辆限制速度。 短句来源 Firstly, the wind speed mathematical model is established and the wind speed curve is drawn by simulating. Compared the simulating wind speed curve with the actual wind speed curve, a conclusion is drawn that the established model has accuracy and feasibility. 本文首先建立了风速数学模型,仿真绘出了风速时变曲线,通过与实测风速数据曲线的比较,验证了所建风速模型的正确性和可行性; 短句来源 A new mathematic tool-wavelet analysis is introduced in this article. Because of its advantage of“mathematic microscope”,wavelet analysis will be of good prospect in its application to establishing the long-span spatial structure's three dimension model. 还介绍了一种新兴的数学工具———小波分析 ,因其“数学显微镜”的特性 ,小波分析在大跨度空间结构三维风速模型分析中有良好的应用前景。 短句来源 This paper deals with stochastic characteristic of the wind speed, and gives an auto-regressive moving-average (ARMA) model for wind speed subjected to particular power spectral density. 该文针对风速随机变化的特性,在风速统计特性研究的基础上,用自回归滑动平均(ARMA)方法建立了具有一定功率谱密度特性的风速模型。 短句来源 Simulation result is given for analysis and validity, and is compared with that of other model. It is concluded that the proposed ARMA model is effective in wind speed simulation. 对该模型所模拟的风速序列进行了分析和验证,并与现有仿真程序中风速模型的结果进行了对比,结果表明该文提出的ARMA模型能够有效地产生动态分析和仿真所需的风速序列。 短句来源 更多

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 wind speed model
 We present a comparative study of the conventional stationary wind speed model and a newly proposed non-stationary wind speed model using field measurements. The comparative study demonstrates that the non-stationary wind model appears to be more appropriate than the conventional stationary wind speed model for characterizing turbulent winds of one-hour duration over complex terrain. A Spectral Approach for Determining Altimeter Wind Speed Model Functions
 wind model
 For our analysis, we have chosen a disk wind model in which the gas component of the wind is heated through ambipolar diffusion to a temperature of ～104 K. Dust formation in binaries with OB and WR components in a two-phase stellar-wind model We describe the formation of carbon dust in binary systems with hot components as a result of the collisions of clouds in a two-phase stellar-wind model. A number of features are detected outside the nebula NGC 6888, within 1.2° (30 pc) of the star WR 136, which can be explained in a two-phase stellar-wind model. Hence, the wind model of optimal migration theory predicts that birds should be sensitive to winds and that there should be a correlation between departures and winds blowing towards the intended migration direction. 更多
 In the wind simulation of long-span spatial structure,both time and spatial correlation and local non-Gaussian characters should be considered.In the paper,the traits of wind velocity and loading are considered different spectral density functions of wind are discussed and the results of two kinds of simulation approachs-wave superposition method and linear filter method are compared.The maximum entropy method and its application are also introduced.Here Hermite transformation method is used in calculation of... In the wind simulation of long-span spatial structure,both time and spatial correlation and local non-Gaussian characters should be considered.In the paper,the traits of wind velocity and loading are considered different spectral density functions of wind are discussed and the results of two kinds of simulation approachs-wave superposition method and linear filter method are compared.The maximum entropy method and its application are also introduced.Here Hermite transformation method is used in calculation of the approximate power density function in accordance with random process's skewness and kurtosis.A new mathematic tool-wavelet analysis is introduced in this article.Because of its advantage of“mathematic microscope”,wavelet analysis will be of good prospect in its application to establishing the long-span spatial structure's three dimension model. 大跨空间结构的风速模拟需要考虑风的时间和空间相关特性以及局部区域内风载的非高斯特性。从大跨度结构的风速风载特点入手 ,讨论了几种常用的风速功率谱并比较了两种风模拟方法———谐波迭加法与线性滤波器法的特点 ,阐述了最大熵值法及其应用。指出Hermite变换法用随机过程的偏度系数和峰度系数可推导出符合度较好的PDF函数。还介绍了一种新兴的数学工具———小波分析 ,因其“数学显微镜”的特性 ,小波分析在大跨度空间结构三维风速模型分析中有良好的应用前景。 Wind power generator sets are much different from traditional ones, such as gas turbine-generator sets, for power of the wind turbines cannot be controlled substantially, due to variability and uncontrollable of the wind. As the wind conditions impact largely on performance of the wind power generation systems, wind speed model is important in simulation of the systems. This paper deals with stochastic characteristic of the wind speed, and gives an auto-regressive moving-average (ARMA) model for wind speed subjected... Wind power generator sets are much different from traditional ones, such as gas turbine-generator sets, for power of the wind turbines cannot be controlled substantially, due to variability and uncontrollable of the wind. As the wind conditions impact largely on performance of the wind power generation systems, wind speed model is important in simulation of the systems. This paper deals with stochastic characteristic of the wind speed, and gives an auto-regressive moving-average (ARMA) model for wind speed subjected to particular power spectral density. Simulation result is given for analysis and validity, and is compared with that of other model. It is concluded that the proposed ARMA model is effective in wind speed simulation. 风力发电机组不同于火电等传统发电机组的最大之处在于其原动机功率的本质不可控,这是由风速的易变性和不可控性造成的。风速状况对风力发电系统的性能有着重要的影响,也使得风速模型成为风力发电系统仿真模型的重要部分。该文针对风速随机变化的特性,在风速统计特性研究的基础上,用自回归滑动平均(ARMA)方法建立了具有一定功率谱密度特性的风速模型。对该模型所模拟的风速序列进行了分析和验证,并与现有仿真程序中风速模型的结果进行了对比,结果表明该文提出的ARMA模型能够有效地产生动态分析和仿真所需的风速序列。 Above a non-uniform underlying surface,the mean height of roughness elements,fractional vegetation coverage and leaf area index are the most essential parameters of vertical wind profile under neutral condition.The mean height H,leaf area index LAI and fractional vegetation coverage σ of wheat at Yucheng Integrated Agricultural Experiment Station are simulated as functions of NDVI by using LANDSAT-5 data,every-ten-days observed data in the field,the every-ten-days NDVI data from NOAA-14 meteorological satellite,1∶(10... Above a non-uniform underlying surface,the mean height of roughness elements,fractional vegetation coverage and leaf area index are the most essential parameters of vertical wind profile under neutral condition.The mean height H,leaf area index LAI and fractional vegetation coverage σ of wheat at Yucheng Integrated Agricultural Experiment Station are simulated as functions of NDVI by using LANDSAT-5 data,every-ten-days observed data in the field,the every-ten-days NDVI data from NOAA-14 meteorological satellite,1∶(10 000) land-use data,and 1:10000 topographical data.The functions are as follows:LAI=-51.915+11.603·ln(NDVI)when NDVI increases(correlation coefficient is 0.889)-51.751+11.077·lnNDVI)when NDVI decreaes(correlation coefficient is 0.860)H=-238.753+2.251·NDVIwhen NDVI increases(correlation coefficient is 0.868)93.2cmwhen NDVI decreasesσ=e~(28.308+5.679ln(NDVI))when NDVI increases(correlation coefficient is 0.920)e~(-3.712+0.733ln(NDVI))when NDVI increases(correlation coefficient is 0.889) In terms of hourly observed wind horizontal velocity at a height of 2m during the period from 21:05 on 5th March of 2000 to 7:05 on 24th May of 2000,the formulation of wind horizontal velocity is simulated as:u(z,t)=2.44u_*(t)1.54σ(t)(LAI(t))~(0.37)+(1-σ(t))ln1.54σ(t)(LAI(t))~(0.37)+(1-σ(t))]z-0.98H(t)σ(t)(LAI(t))~(0.37)0.2H(t)(LAI(t))~(0.74)The calculation results of wind horizontal velocity at a height of 4m show that the simulated velocity is almost identical with the observation one. The spatial interpolation can be executed in four steps: 1) to check the data quality and evaluate the roughness around the anemometer locations;2) to calculate the mesowind in 5km×5km grid cell around the stations;3) to calculate the macrowind above selected basic wind stations;and 4) to geographically smooth the macrowind,from which the macrowind can be obtained for every 5km×5km grid cell, irrespective of whether it contains a wind station. 通过对中性条件下裸露土壤表面、均一植被覆盖表面和非均质下垫面水平风速模型的分析发现,粗糙元素的平均高度H、植被覆盖率σ和叶面积指数LAI是垂直风速廓线的最基本参数.据此,以中国科学院地理科学与资源研究所的山东禹城农业综合试验站为案例区,运用2000年小麦生长的实地监测数据、2000年3月30日的轨道号为122-34的LANDSAT-5卫星数据、NOAA-14气象卫星逐旬NDVI数据、1∶1万土地利用数据和1∶1万地形数据,模拟分析了小麦植株高度H、叶面积指数和覆盖率σ变化规律及其与植被指数NDVI的关系;建立了中性条件下禹城农业综合试验站垂直风速廓线模型,对禹城农业综合试验站2000年3月5日21:05至2000年5月24日7:05的4m、60m和1 000m高度处的逐时风速进行了模拟分析,讨论了风速的空间插值问题。 << 更多相关文摘
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