八挡定轴齿轮变速箱动态特性仿真研究

发布时间：2018-07-01 08:42

本文选题：齿轮 + 动态特性　；参考：《吉林大学》2012年硕士论文

【摘要】：齿轮传动系统具有工作可靠、使用寿命长、瞬时传动比为常数、传动效率高、结构紧凑、功率和速度适用范围广等优点，是各种机器、仪器和设备中应用最广的运动和动力的传递装置,同时齿轮传动具有制造成本高，振动和噪声较大、易产生动载荷、动态特性复杂和设计难度较大等缺点。在振动方面，齿轮传动系统的内部激励是造成齿轮箱磨损和损坏的一个主要因素，了解齿轮传动内部激励的机理，通过改进设计或采取适当措施回避，可以提高齿轮传动系统的可靠性、稳定性和延长使用寿命。齿轮的啮合频率是齿轮系统内部激励的主要形式，本文主要研究八挡定轴齿轮变速箱的啮合频率和箱体及齿轮的模态等动态特性，为齿轮箱的设计提供理论依据。主要研究内容有：1）对齿轮系统动态特性研究方法和发展现状进行了简要综述，介绍了某型号的八挡定轴齿轮变速箱的结构组成和传动原理，并用UG建立了三维模型；2）介绍了虚拟样机技术及计算机多体动力学仿真软件ADAMS，并利用多体动力学仿真软件ADAMS建立了八挡定轴齿轮系统的虚拟样机模型，，对虚拟样机进行了检查和验证，仿真结果与理论计算结果符合的很好，说明了这种齿轮系统动态特性分析方法的可行性。3）基于重合度概念将齿轮实际啮合线分为三个阶段，并对齿轮对的啮合过程进行了分段分析，找出了齿轮单齿啮合力的变化趋势和主要形成啮合频率和冲击的点位。4）计算了八挡定轴齿轮系统的啮合频率，同时用ADAMS的快速傅里叶变换（FFT）对八挡定轴齿轮系统的各齿对啮合力的仿真结果进行了时域和频域的转换得到了八挡定轴齿轮系统的齿轮啮合频率并与理论计算结果值进行了比较,结果一致。5）利用有限元分析软件ANSYS Workbench对八挡定轴齿轮变速箱的齿轮和箱体进行了模态分析，得到了齿轮的前9阶模态和振型，得到了箱体的前20阶模态和振型，并与八挡定轴齿轮变速箱的齿轮啮合频率进行了比较，验证了齿轮及箱体的材料选择和结构设计是恰当的。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.41

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