本文選題：隨機風速 + 齒輪傳動系統(tǒng)��； 參考：《太原理工大學》2014年碩士論文

【摘要】：幾百年來,石油、天然氣等礦物質能源促進了人類社會的發(fā)展,然而,伴隨著對能源的利用,地球的生態(tài)環(huán)境也遭到極大的破壞。為了保證人類社會的可持續(xù)發(fā)展,世界各國紛紛開始投入到對新能源的開發(fā)利用中來。其中,利用純凈無污染且儲量豐富的風能進行發(fā)電的技術已相當成熟,并發(fā)揮出巨大的經(jīng)濟效益。 風力發(fā)電機一般都安裝在高山、海邊等風能充足的地方,維修和保養(yǎng)比較困難,因此對其可靠性提出了很高的要求。但是,在實際運行中發(fā)現(xiàn),部分風場的風電機組故障率較高,其中,由齒輪箱失效引起的故障占到了一半以上。因此,為了提高系統(tǒng)安全運行的可靠性,本文以某1.5MW風力發(fā)電機齒輪箱為研究對象,在充分考慮隨機風速引起的動態(tài)外載荷情況下,對其動態(tài)特性進行研究,主要內(nèi)容如下： 確定齒輪箱的基本傳動形式與各級傳動的具體結構,建立其物理模型。在剛性體基本假設下,建立兩級行星傳動和高速級平行軸傳動的動力學方程,根據(jù)耦合條件,得到系統(tǒng)的二階動力學微分方程,建立系統(tǒng)的動力學分析模型,并仔細討論了模型中涉及的各主要參數(shù)。另外,對系統(tǒng)的外部激勵進行了分析,根據(jù)IECKAI風速模型,得到50s內(nèi)的風速時間歷程,綜合修正的風能利用系數(shù),得到系統(tǒng)的輸入轉矩曲線。 基于虛擬樣機技術和有限元分析方法,對齒輪系統(tǒng)的動態(tài)特性進行分析,在驗證仿真模型正確性的基礎上,得到系統(tǒng)的輪齒間動態(tài)嚙合力和動態(tài)軸承力。對結果分析表明,軸承力受外載荷影響的作用明顯,隨載荷的變化具有相同的變化趨勢,另外發(fā)現(xiàn),兩級行星輪系所受力矩大于平行軸傳動,在系統(tǒng)運行時更容易發(fā)生失效現(xiàn)象。 在滿足系統(tǒng)正常運轉及疲勞強度的條件下,根據(jù)系統(tǒng)可靠性定義,設計齒輪系統(tǒng)的可靠性模型,以基本設計參數(shù)為變量,對風力發(fā)電機齒輪系統(tǒng)的兩級行星輪系做優(yōu)化設計,對比優(yōu)化前后的構件振動位移幅值發(fā)現(xiàn),優(yōu)化后系統(tǒng)的振動幅度大大減小,系統(tǒng)體積和重量也有所降低,有效提高了系統(tǒng)安全運行的可靠性。
[Abstract]:For hundreds of years, petroleum, natural gas and other mineral energy have promoted the development of human society. However, with the use of energy, the ecological environment of the earth has also been greatly damaged. In order to ensure the sustainable development of human society, the world began to invest in the development and utilization of new energy. Among them, the technology of generating electricity by pure and clean wind energy with abundant reserves is quite mature and exerts great economic benefits. Wind turbines are generally installed in high mountains, seaside and other places where wind energy is abundant, so it is difficult to repair and maintain, so the reliability of wind turbines is very high. However, it is found that the failure rate of wind turbine in some wind field is high, among which, the failure caused by gearbox failure accounts for more than half. Therefore, in order to improve the reliability of the safe operation of the system, this paper takes a 1.5MW wind turbine gearbox as the research object, and fully considers the dynamic external load caused by the random wind speed. The main contents are as follows: The basic transmission form of gearbox and the concrete structure of all levels of transmission are determined, and its physical model is established. Under the basic assumption of rigid body, the dynamic equations of two stage planetary transmission and high speed parallel shaft transmission are established. According to the coupling conditions, the second order dynamic differential equation of the system is obtained, and the dynamic analysis model of the system is established. The main parameters involved in the model are discussed in detail. In addition, the external excitation of the system is analyzed. According to the IECKAI wind speed model, the time history of the wind speed in 50s is obtained, and the input torque curve of the system is obtained by synthesizing the modified wind energy utilization coefficient. Based on virtual prototyping technology and finite element analysis method, the dynamic characteristics of gear system are analyzed. On the basis of verifying the correctness of simulation model, the dynamic meshing force and dynamic bearing force between gear teeth are obtained. The analysis of the results shows that the bearing force is obviously affected by the external load and has the same changing trend with the change of the load. In addition, it is found that the torque of the two-stage planetary gear train is greater than that of the parallel shaft transmission. Failure is more likely to occur when the system is running. Under the condition of satisfying the normal operation and fatigue strength of the system, according to the definition of system reliability, the reliability model of the gear system is designed. Taking the basic design parameters as the variable, the two-stage planetary gear train of the wind turbine gear system is optimized. Comparing the amplitude of vibration displacement before and after optimization, it is found that the vibration amplitude of the optimized system is greatly reduced, and the volume and weight of the system are also reduced, which effectively improves the reliability of the safe operation of the system.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM315;TH132.41

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