风力发电机组发电系统并网可靠度分析

风力作为可再生能源成为各国致力开发的重点能源,然而风速的变动直接影响供电品质,这使得风力发电并网的可靠度分析成为一个研究热点。本文从可靠度计算数学模型,可靠度基础概念、风力发电机组可靠度模型三方面入手,探讨了风力发电机组发电系统并网的可靠度,为该问题的解决提供理论依据。     

新型风力发电站

听新闻里说,城市一到用电高峰期,就会缺电,那多不方便啊。我观察了现在的风力发电站,主要是利用自然风使风车转动,风车带动发电机转动发电。可是,这种发电模式     

嘿!一起旅行吧

植物世界,奥妙无穷。不同的环境,造就了不同植物的特殊本领。为了传播种子,植物们各显神通,有的借助风力,有的借助附着力,张开隐形的翅膀,搭上免费车,四处旅行!     

Dynamic Simulation on Collision Between Ship and Offshore Wind Turbine简

By using ABAQUS/Explicit, the dynamic process of an offshore wind turbine（OWT） stricken by a ship of 5000DWT in the front direction is simulated. The OWT is located on a large-scale prestressing bucket foundation constructed by an integrated installation technique. According to the simulation results, under the ship collision, a cer-tain range of plastic zone appears within a local area of arc transition structure of the bucket foundation, and the con-crete plastic zone is seriously damaged. As the stress level of OWT tower is relatively low, the OWT tower is less af-fected. A great inertial force is generated at the top of the OWT tower as the mass of nacelle and blades is up to 400 t. The displacement of the tower is in the opposite direction of the ship collision at the end of 1 s under the action of iner-tial force. There is only a minor damage in the ship bow. Most of the kinetic energy is transformed into the plastic dissipation and absorbed by the arc transition structure of bucket foundation.     

消失的麦客

一大早,爷爷就拎把镰刀出了门,再进门时,领了个麦客回来。麦客是揽工割麦的。母亲做好了早饭,一看爷爷身边的麦客,惊讶地"咦"了一声,皱着眉头说:"爹,咋是个孩子啊?"爷爷晃了晃手里的镰刀,嘿嘿一笑说:"别看人小,本事不小。刚才我领他到麦地里窜一圈,试试身手,一点儿不孬。"     

Models for lifetime estimation： an overview with focus on applications to wind turbines

This paper provides an overview of models and methods for estimation of lifetime of technical components. Although the focus in this paper is on wind turbine applications, the major content of the paper is of general nature. Thus, most of the paper content is also valid for lifetime models applied to other technical systems. The models presented and discussed in this paper are classified in different types of model classes. The main classification used in this paper divides the models in the following classes： physical models, stochastic models, data-driven models and artificial intelligence, and combined models. The paper provides an overview of different models for the different classes. Furthermore, advantages and disadvantages of the models are discussed, and the estimation of model parameters is briefly described. Finally, a number of literature examples are given in this paper, providing an overview of applications of different models on wind turbines.     

“胆小鬼”小米

正"救命呀!救命呀!"怎么了?原来是小米在呼喊,他特别胆小,肯定是被丢丢、可可那几个淘气包吓着了。小米是一只小猫,他是男的,却比女生还胆小,即便是一只老鹰飞过,他也会吓得慌忙跑回家。这次,小鸟丢丢穿着一套老鹰服,飞过来要抓小米。小米吓得差点昏过去,跑进一个树洞里,却发现,原来是丢丢在恶作剧!他可生气了,但又没办法,谁叫自己胆小呢?还有一回,小米和小狗豆豆一起走着,豆     

卷烟机除尘和风力送丝烟丝在线单独回收装置的研究

目前我国卷烟工业企业中普遍采用集中除尘系统,相对以前的单机除尘,集中除尘系统避免对车间的二次污染。正常生产过程中,卷烟机除尘管道和风力送丝管道（回除尘房管道）当中都会带有不同长度的烟丝,这些烟丝被集中回收到除尘房进行二次处理,由于系统是集中除尘和集中风力送丝,回收到除尘房的是各个品牌混合烟丝,这些烟丝只能按照最低等级进行使用,造成高等级的烟丝价值损失。我们需要在除尘管道和风力送丝管道当中设计、增加一套烟丝回收装置,将两套管路当中的烟丝进行过滤、收集、并及时回送至该机台,避免烟丝降级使用情况的发生,节约烟丝使用成本。     

关于2022年一道高考物理题的分析与拓展

理论分析并实验验证2022年高考湖南卷物理第5题的物理情境，在此基础上本文就更复杂的物理情境做了实验验证和进一步理论论证.     

定量推导“风力”公式 助力解答“流体”问题

以放风筝物理模型为例,推导了水平方向的气流对风筝面产生的作用力即风力与风速之间的数量关系;对有关流体与障碍物平面发生相互作用的动力学问题进行归类解答。