本文選題：齒輪 + 動態(tài)特性　； 參考：《吉林大學(xué)》2012年碩士論文

【摘要】：齒輪傳動系統(tǒng)具有工作可靠、使用壽命長、瞬時傳動比為常數(shù)、傳動效率高、結(jié)構(gòu)緊湊、功率和速度適用范圍廣等優(yōu)點(diǎn)，是各種機(jī)器、儀器和設(shè)備中應(yīng)用最廣的運(yùn)動和動力的傳遞裝置,同時齒輪傳動具有制造成本高，振動和噪聲較大、易產(chǎn)生動載荷、動態(tài)特性復(fù)雜和設(shè)計(jì)難度較大等缺點(diǎn)。在振動方面，齒輪傳動系統(tǒng)的內(nèi)部激勵是造成齒輪箱磨損和損壞的一個主要因素，了解齒輪傳動內(nèi)部激勵的機(jī)理，通過改進(jìn)設(shè)計(jì)或采取適當(dāng)措施回避，可以提高齒輪傳動系統(tǒng)的可靠性、穩(wěn)定性和延長使用壽命。 齒輪的嚙合頻率是齒輪系統(tǒng)內(nèi)部激勵的主要形式，本文主要研究八擋定軸齒輪變速箱的嚙合頻率和箱體及齒輪的模態(tài)等動態(tài)特性，為齒輪箱的設(shè)計(jì)提供理論依據(jù)。主要研究內(nèi)容有：1）對齒輪系統(tǒng)動態(tài)特性研究方法和發(fā)展現(xiàn)狀進(jìn)行了簡要綜述，介紹了某型號的八擋定軸齒輪變速箱的結(jié)構(gòu)組成和傳動原理，并用UG建立了三維模型；2）介紹了虛擬樣機(jī)技術(shù)及計(jì)算機(jī)多體動力學(xué)仿真軟件ADAMS，并利用多體動力學(xué)仿真軟件ADAMS建立了八擋定軸齒輪系統(tǒng)的虛擬樣機(jī)模型，，對虛擬樣機(jī)進(jìn)行了檢查和驗(yàn)證，仿真結(jié)果與理論計(jì)算結(jié)果符合的很好，說明了這種齒輪系統(tǒng)動態(tài)特性分析方法的可行性。3）基于重合度概念將齒輪實(shí)際嚙合線分為三個階段，并對齒輪對的嚙合過程進(jìn)行了分段分析，找出了齒輪單齒嚙合力的變化趨勢和主要形成嚙合頻率和沖擊的點(diǎn)位。4）計(jì)算了八擋定軸齒輪系統(tǒng)的嚙合頻率，同時用ADAMS的快速傅里葉變換（FFT）對八擋定軸齒輪系統(tǒng)的各齒對嚙合力的仿真結(jié)果進(jìn)行了時域和頻域的轉(zhuǎn)換得到了八擋定軸齒輪系統(tǒng)的齒輪嚙合頻率并與理論計(jì)算結(jié)果值進(jìn)行了比較,結(jié)果一致。5）利用有限元分析軟件ANSYS Workbench對八擋定軸齒輪變速箱的齒輪和箱體進(jìn)行了模態(tài)分析，得到了齒輪的前9階模態(tài)和振型，得到了箱體的前20階模態(tài)和振型，并與八擋定軸齒輪變速箱的齒輪嚙合頻率進(jìn)行了比較，驗(yàn)證了齒輪及箱體的材料選擇和結(jié)構(gòu)設(shè)計(jì)是恰當(dāng)?shù)摹?br/>[Abstract]:Gear transmission system has the advantages of reliable operation, long service life, constant instantaneous transmission ratio, high transmission efficiency, compact structure, wide application range of power and speed, and so on. The most widely used transmission device of motion and power in instruments and equipments is gear transmission, which has the disadvantages of high manufacturing cost, high vibration and noise, easy to produce dynamic load, complex dynamic characteristics and great difficulty in design. In the aspect of vibration, the internal excitation of gear transmission system is one of the main factors that cause the wear and damage of gear box. To understand the mechanism of internal excitation of gear transmission, we can avoid it by improving the design or taking appropriate measures to avoid it. It can improve the reliability, stability and service life of gear transmission system. The meshing frequency of gear is the main form of internal excitation of gear system. This paper mainly studies the meshing frequency and the dynamic characteristics of gear box and gear modal, which provides the theoretical basis for the design of gear box. The main research contents are as follows: (1) the research methods and development status of the dynamic characteristics of gear system are summarized briefly, the structure composition and transmission principle of a certain type of gear gearbox with eight gears are introduced, and the three-dimensional model is established by UG. 2) the virtual prototyping technology and the computer multi-body dynamics simulation software Adams are introduced, and the virtual prototype model of the eight-block fixed shaft gear system is established by using the multi-body dynamics simulation software Adams, and the virtual prototype is checked and verified. The simulation results are in good agreement with the theoretical results, which shows the feasibility of the dynamic characteristic analysis method of the gear system. 3) based on the concept of coincidence degree, the actual meshing line of the gear is divided into three stages. The meshing process of gear pair is analyzed, and the change trend of gear single tooth meshing force and the point of main meshing frequency and impact are found out.) the meshing frequency of eight retaining fixed axis gear system is calculated. At the same time, with the help of Adams Fast Fourier transform (FFT), the simulation results of the meshing force between the teeth of the octave gear system are converted in the time domain and the frequency domain, and the meshing frequency of the gear is obtained and the theoretical calculation is made. The fruit value was compared, The results are consistent with 5. 5) the modal analysis of gear and box of the gear box with eight gears is carried out by using the finite element analysis software ANSYS Workbench. The first 9 modes and modes of the gear are obtained, and the first 20 modes and modes of the box are obtained. The meshing frequency of gear is compared with that of the gear gearbox with eight gears, and it is proved that the material selection and structural design of gear and box are appropriate.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH132.41

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