Nc milling - machine big size variable - pitch screw rod 數(shù)控車銑加工大尺寸變螺距絲杠
Specifies a variable - pitch font 指定間距可變的字體。
It has been well established by studies in reading that text printed with variable - pitch fonts is more readable than fixed - pitch font texts 閱讀用可變字體打印的文本比用等寬字體的文本更易讀,這已被確定。
Based on 1mw wind turbine design , this paper offers one reasonable variable - pitch structure , which can response quickly and operate conveniently 本文按照1mw風(fēng)電機(jī)組總體方案要求,設(shè)計(jì)出一種結(jié)構(gòu)合理,反應(yīng)靈敏、操作方便的變槳距機(jī)構(gòu)。
According to the effect of variable - pitch system , we can divide the operation process into three states : starting , below rated power and rated power 變槳距風(fēng)力發(fā)電機(jī)組根據(jù)變槳距系統(tǒng)所起的作用可分為三種運(yùn)行狀態(tài),即風(fēng)力發(fā)電機(jī)組的起動狀態(tài)、欠功率狀態(tài)和額定功率狀態(tài)。
In this paper , different computation methods and the hydrodynamic performance of vertical - axis variable - pitch cycloidal ( voith - schneider ) rotor and kobold horizontal - axis rotor are studied 本文以可調(diào)角直葉擺線式水輪機(jī)和蹼板式水輪機(jī)為對象,研究它們的水動力性能及其理論計(jì)算方法。
Compared with fix - pitch wind turbine , the variable - pitch wind turbine has the virtue : stable output power over rated power , high wind power coefficient , holding rated power at high wind speed , good starting and shut - off etc . 變槳距風(fēng)力發(fā)電機(jī)組與定槳距風(fēng)力發(fā)電機(jī)組相比,在額定功率點(diǎn)以上輸出功率平穩(wěn)、具有較高的風(fēng)能利用系數(shù)、能夠確保高風(fēng)速段的額定功率、起動性能與制動性能好等特點(diǎn)。
For the vertical - axis variable - pitch cycloidal rotor , the article unify hydrodynamic performance symbol at first , classify and trim the calculation methods and formula of predicting fluid dynamical capability of water - power rotor and wind - power wheel that have been formed up to now 對于可調(diào)角直葉擺線式水輪機(jī),首先統(tǒng)一定義了水動力性能符號,將已有的水力與風(fēng)力轉(zhuǎn)輪的流體動力性能理論計(jì)算方法和計(jì)算公式進(jìn)行分類和整理。
Then , the methods that have been used to the vertical - axis variable - pitch cycloidal rotor are applied and the corresponding calculation formulas are formed . finally , the numerical results are presented and compared each other but yet they need farther examination and validation 首先給出了一種阻力型計(jì)算方法;然后將計(jì)算擺線式水輪機(jī)的各種方法推廣應(yīng)用于蹼板式水輪機(jī),得到了相應(yīng)的計(jì)算公式;最后給出了數(shù)值結(jié)果,并進(jìn)行了比較研究。
The result of computer and analysis based on blade elements theory shows us that we can regulate the rotate speed of wind turbine rotor by changing set angle and pitch h . variable - pitch system is the key component of the whole wind turbine , which can assure safely pitch - control and brake 本文利用葉素理論,經(jīng)計(jì)算分析得出:通過改變風(fēng)力機(jī)安裝角可以改變槳距h ,從而改變風(fēng)力機(jī)的轉(zhuǎn)速。變距機(jī)構(gòu)是變槳距控制型風(fēng)電機(jī)組實(shí)現(xiàn)變距控制和安全剎車的關(guān)鍵機(jī)構(gòu)之一,它的運(yùn)動由平動和轉(zhuǎn)動兩部分組成。