發(fā)布時(shí)間：2018-04-26 10:31

  本文選題：水電機(jī)組主軸 + 水力影響　； 參考：《河北聯(lián)合大學(xué)》2014年碩士論文

【摘要】：隨著社會(huì)經(jīng)濟(jì)的高速發(fā)展，社會(huì)對(duì)電力能源的需求量越來(lái)越大，水力發(fā)電逐漸引起了我們高度的關(guān)注。但是水電機(jī)組主軸穩(wěn)定性問(wèn)題一直困擾著人們。尤其是在大水力沖擊和高強(qiáng)度磁場(chǎng)的作用下，其規(guī)律還有待探索。因此，對(duì)水電機(jī)組主軸系統(tǒng)穩(wěn)定性研究是十分必要的。 運(yùn)用有限元法和傳遞矩陣法分別計(jì)算固有頻率，，驗(yàn)證結(jié)果可靠性。探究了附加水質(zhì)量、電磁剛度和陀螺效應(yīng)對(duì)固有頻率的影響。結(jié)果表明：陀螺效應(yīng)是主要影響因素、電磁剛度次之、附加水質(zhì)量影響最小。各因素均值得引起重視。 探究了水力影響、磁力影響以及不同初始條件的影響。結(jié)果表明：附加水質(zhì)量對(duì)振動(dòng)的影響并不十分顯著，振動(dòng)基本穩(wěn)定時(shí)發(fā)電機(jī)轉(zhuǎn)子和水輪機(jī)轉(zhuǎn)輪的振幅相近，而且水輪機(jī)轉(zhuǎn)輪的振幅略大，下機(jī)架的振幅遠(yuǎn)小于二者，三者振動(dòng)速度極值相近；抬機(jī)現(xiàn)象和b10（電磁影響因素中位移三次項(xiàng)的系數(shù)）是主要影響因素，它們的增大會(huì)加速下機(jī)架振動(dòng)速度的下降；下機(jī)架的振動(dòng)速度變化最快，水輪機(jī)次之，轉(zhuǎn)子最慢，但是三者的包絡(luò)線的變化趨勢(shì)基本一致。在分別單獨(dú)給予三部分相同振動(dòng)初速度時(shí)，作用在發(fā)電機(jī)轉(zhuǎn)子上的瞬時(shí)沖擊引起振動(dòng)的最大，作用在水輪機(jī)轉(zhuǎn)輪上次之，作用在下機(jī)架上振動(dòng)最小。與給予系統(tǒng)振動(dòng)初位移時(shí)不同的是振動(dòng)基本穩(wěn)定時(shí)，水輪機(jī)的速度極值是另兩部分的數(shù)倍。阻尼11（位移阻尼）的提高會(huì)引起振幅的明顯下降；阻尼21（速度阻尼）同樣會(huì)引起振幅的下降，但是效果沒(méi)有阻尼11明顯。另外阻尼21的提高在時(shí)域圖中會(huì)增加曲線單調(diào)下降前的振動(dòng)次數(shù)，在幅頻曲線中會(huì)減小共振區(qū)的寬度；幅頻曲線中，共振區(qū)的振幅極值隨著f1（抬機(jī)現(xiàn)象振幅）的減小而成比例降低，f1的減小還會(huì)縮小共振區(qū)的寬度。
[Abstract]:With the high - speed development of the social economy , the demand for power energy is increasing and the hydroelectric power generation has caused our attention . However , the problem of the stability of the main shaft of the hydro - hydro unit has been beset by people , especially under the influence of large hydraulic shock and high intensity magnetic field . Therefore , it is necessary to study the stability of the main shaft system of hydro - hydro unit .

The effects of additional water quality , electromagnetic stiffness and gyroscopic effect on natural frequency were studied by means of finite element method and transfer matrix method .

The effects of hydraulic influence , magnetic force and different initial conditions are studied . The results show that the influence of the additional water quality on the vibration is not very significant , the amplitude of the generator rotor and the turbine runner is similar when the vibration is basically stable , the amplitude of the rotating wheel of the turbine is slightly larger , and the amplitude of the lower frame is much smaller than that of both .
The lifting phenomenon and the b10 ( the coefficient of displacement three items in the electromagnetic influence factors ) are the main influencing factors , and their increase can accelerate the decrease of the vibration speed of the lower frame ;
The vibration velocity of the lower frame is the fastest , the second of the turbine and the slowest of the rotor , but the change trend of the envelope of the three is basically the same . When three parts of the same vibration initial speed are given separately , the maximum vibration caused by the transient impact on the rotor of the generator is the least of the vibration . When the vibration is basically stable with the initial displacement of the given system , the speed extreme value of the water turbine is multiple of the other two parts .
The damping 21 ( velocity damping ) also causes a decrease in amplitude , but the effect is not damped 11 . In addition , the increase of damping 21 increases the number of oscillations before the curve monotonically decreases in the time domain diagram , and the width of the resonance region is reduced in the amplitude frequency curve ;
In the amplitude - frequency curve , the amplitude extreme of the resonance region decreases in proportion with the decrease of f1 ( the amplitude of the lift phenomenon ) , and the reduction of f1 also reduces the width of the resonance region .

【學(xué)位授予單位】：河北聯(lián)合大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TV734

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