兩級行星齒輪裂紋故障動力學建模與動態(tài)特性研究
發(fā)布時間：2018-12-11 15:04
【摘要】：行星齒輪傳動系統(tǒng)因性能優(yōu)異,常作為機械系統(tǒng)核心部件,現(xiàn)已廣泛應用于風機、盾構機、直升機以及船舶等大型機械設備中。但因其結構復雜而常工作在低速、重載等惡劣工況下,噪聲和各類故障已嚴重影響其安全、可靠運行。據(jù)統(tǒng)計,齒根裂紋是齒輪傳動系統(tǒng)的一種常見故障,因其早期故障微弱易被忽略,常進一步演變?yōu)閿帻X、缺齒等嚴重故障。因此非常有必要建立齒根裂紋故障的動力學模型,研究不同程度的齒根裂紋故障對行星齒輪系統(tǒng)動態(tài)響應的影響,為行星齒輪的故障診斷與可靠性研究提供必要信息。本文的主要研究工作及結果簡述如下:(1)針對現(xiàn)有齒根裂紋模型存在的不足,本文提出了改進的齒根裂紋模型,設定齒根裂紋沿著深度和寬度兩個方向同時呈拋物線狀擴展,避免了單一方向和直線設定的過分簡化引入的誤差�；贑REO建立了20種不同程度的齒根裂紋模型,用以模擬齒根裂紋擴展的不同階段,為后續(xù)研究裂紋程度對行星齒輪系統(tǒng)的影響奠定了基礎。(2)針對純剛體模型無法準確反映行星齒輪特征的問題,本文將含齒根裂紋故障的第一級太陽輪和作為級間連接的第一級行星架為柔性體,參照行星齒輪箱實驗臺,基于CREO、ADAMS和ANSYS,構建了兩級行星齒輪箱的剛柔耦合動力學模型,使之能夠更準確反映行星齒輪的運行情況,并兼顧計算效率,從而獲得系統(tǒng)動態(tài)響應,為后續(xù)信號分析提供了必要依據(jù)。(3)針對含不同裂紋程度的行星齒輪系統(tǒng),本文通過對振動響應的頻譜特征與統(tǒng)計特征的分析,獲得裂紋故障對系統(tǒng)影響的定量分析結果。通過對比解析模型,驗證了剛柔耦合模型的正確性;對比純剛體模型和剛柔耦合模型的仿真信號,證明了剛柔耦合模型更適用于故障系統(tǒng)分析;通過對比不同裂紋程度的統(tǒng)計特征,從同深度裂紋和同寬度裂紋兩個角度定量分析了齒根裂紋對系統(tǒng)性能的影響,并獲得篩選出具有故障靈敏度的指標,為行星齒輪性能退化與可靠性研究提供有價值的參考。(4)以ERPHM實驗室的動力傳動系統(tǒng)故障診斷綜合試驗臺(DDS)為依托設計實驗,通過加工獲得不同程度的齒根裂紋故障,在和仿真模型中相同的工況下進行試驗與信號采集。分析與驗證的結果進一步驗證了仿真模型的正確性,并為性能退化與壽命預測實驗提供了依據(jù)。綜上所述,本文在提出改進的齒根裂紋模型的基礎上,建立了兩級行星齒輪系統(tǒng)的動力學模型,并基于該模型開展了一系列仿真、驗證與分析。由此獲得的研究結果可為行星齒輪系統(tǒng)故障診斷、預測與可靠性研究提供理論依據(jù),同時為系統(tǒng)實際運行與預警提供實用信息。
[Abstract]:Planetary gear transmission system is often used as the core component of mechanical system because of its excellent performance. It has been widely used in large mechanical equipment such as blower shield machine helicopter and ship etc. However, because of its complex structure, it often works at low speed, heavy load and other bad working conditions, noise and various kinds of faults have seriously affected its safe and reliable operation. According to statistics, root crack is a common fault of gear transmission system, because of its early fault is weak and easy to be ignored, often further developed into broken teeth, tooth defects and other serious faults. Therefore, it is necessary to establish the dynamic model of tooth root crack fault, to study the influence of tooth root crack fault on the dynamic response of planetary gear system, and to provide necessary information for the fault diagnosis and reliability study of planetary gear system. The main research work and results of this paper are summarized as follows: (1) in view of the shortcomings of the existing tooth root crack model, an improved tooth root crack model is proposed in this paper. The tooth root crack propagates parabola along the depth and width simultaneously, which avoids the error caused by the over-simplification of the single direction and the straight line setting. Based on CREO, 20 kinds of tooth root crack models are established to simulate the different stages of tooth root crack growth. It lays a foundation for further study on the influence of crack degree on planetary gear system. (2) aiming at the problem that pure rigid body model can not accurately reflect the characteristics of planetary gear, In this paper, the first stage solar wheel with tooth root crack fault and the first stage planetary frame with interstage connection are considered as flexible bodies. The rigid-flexible coupling dynamic model of two-stage planetary gearbox is constructed based on CREO,ADAMS and ANSYS, referring to the planetary gearbox test table. So that it can more accurately reflect the operation of planetary gear and take into account the calculation efficiency, so as to obtain the dynamic response of the system, which provides the necessary basis for the subsequent signal analysis. (3) for the planetary gear system with different degrees of cracks, By analyzing the spectral and statistical characteristics of the vibration response, the quantitative analysis results of the effect of crack faults on the system are obtained in this paper. The correctness of the rigid-flexible coupling model is verified by comparing the analytical model and the simulation signal of the pure rigid body model and the rigid-flexible coupling model, it is proved that the rigid-flexible coupling model is more suitable for fault system analysis. By comparing the statistical characteristics of different crack levels, the effects of tooth root crack on system performance are quantitatively analyzed from two angles of the same depth crack and the same width crack, and the indexes with fault sensitivity are obtained. It provides a valuable reference for the study of the performance degradation and reliability of planetary gears. (4) based on the design experiment of (DDS), a comprehensive test-bed for power transmission system fault diagnosis in ERPHM laboratory, different degrees of tooth root crack faults are obtained by machining. Experiments and signal acquisition are carried out under the same conditions as in the simulation model. The results of analysis and verification further verify the correctness of the simulation model and provide a basis for performance degradation and life prediction experiments. To sum up, based on the improved root crack model, the dynamic model of two-stage planetary gear system is established, and a series of simulation, verification and analysis are carried out based on the model. The obtained results can provide theoretical basis for fault diagnosis, prediction and reliability research of planetary gear system, as well as practical information for practical operation and early warning of planetary gear system.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH132.425
本文編號：2372760
[Abstract]:Planetary gear transmission system is often used as the core component of mechanical system because of its excellent performance. It has been widely used in large mechanical equipment such as blower shield machine helicopter and ship etc. However, because of its complex structure, it often works at low speed, heavy load and other bad working conditions, noise and various kinds of faults have seriously affected its safe and reliable operation. According to statistics, root crack is a common fault of gear transmission system, because of its early fault is weak and easy to be ignored, often further developed into broken teeth, tooth defects and other serious faults. Therefore, it is necessary to establish the dynamic model of tooth root crack fault, to study the influence of tooth root crack fault on the dynamic response of planetary gear system, and to provide necessary information for the fault diagnosis and reliability study of planetary gear system. The main research work and results of this paper are summarized as follows: (1) in view of the shortcomings of the existing tooth root crack model, an improved tooth root crack model is proposed in this paper. The tooth root crack propagates parabola along the depth and width simultaneously, which avoids the error caused by the over-simplification of the single direction and the straight line setting. Based on CREO, 20 kinds of tooth root crack models are established to simulate the different stages of tooth root crack growth. It lays a foundation for further study on the influence of crack degree on planetary gear system. (2) aiming at the problem that pure rigid body model can not accurately reflect the characteristics of planetary gear, In this paper, the first stage solar wheel with tooth root crack fault and the first stage planetary frame with interstage connection are considered as flexible bodies. The rigid-flexible coupling dynamic model of two-stage planetary gearbox is constructed based on CREO,ADAMS and ANSYS, referring to the planetary gearbox test table. So that it can more accurately reflect the operation of planetary gear and take into account the calculation efficiency, so as to obtain the dynamic response of the system, which provides the necessary basis for the subsequent signal analysis. (3) for the planetary gear system with different degrees of cracks, By analyzing the spectral and statistical characteristics of the vibration response, the quantitative analysis results of the effect of crack faults on the system are obtained in this paper. The correctness of the rigid-flexible coupling model is verified by comparing the analytical model and the simulation signal of the pure rigid body model and the rigid-flexible coupling model, it is proved that the rigid-flexible coupling model is more suitable for fault system analysis. By comparing the statistical characteristics of different crack levels, the effects of tooth root crack on system performance are quantitatively analyzed from two angles of the same depth crack and the same width crack, and the indexes with fault sensitivity are obtained. It provides a valuable reference for the study of the performance degradation and reliability of planetary gears. (4) based on the design experiment of (DDS), a comprehensive test-bed for power transmission system fault diagnosis in ERPHM laboratory, different degrees of tooth root crack faults are obtained by machining. Experiments and signal acquisition are carried out under the same conditions as in the simulation model. The results of analysis and verification further verify the correctness of the simulation model and provide a basis for performance degradation and life prediction experiments. To sum up, based on the improved root crack model, the dynamic model of two-stage planetary gear system is established, and a series of simulation, verification and analysis are carried out based on the model. The obtained results can provide theoretical basis for fault diagnosis, prediction and reliability research of planetary gear system, as well as practical information for practical operation and early warning of planetary gear system.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH132.425
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