外文翻译(齿轮参数化设计及弯曲强度有限元分析).doc

Analysis based on the ANSYS metal gears and plastic gears inherent vibration characteristics compared姓名：班级：Abstract: Using ANSYS software gear finite element model, modal analysis, the plastic gear gun and steel gear module .State of natural frequencies and mode shapes diagram, were analyzed. The conclusion for the dynamic design of gears and gear structure related equipment fault diagnosisOff basis.Key words: plastic gear steel gear gun modal analysis of vibration characteristics0 Introduction The gear drive is the most important in the mechanical transmission drive gear transmission because of its high efficiency, compact structure, the transmission ratio stable and are widely used in engineering. Accelerated due to the development of high-performance engineering plastics, the proportion of the application process for plastic and steel, plastics in the field of mechanical engineering is increasing, the production of gear materials are no longer limited to metallic materials, has grown to the plastic gear. On the application and theoretical study of the plastic gears, and steel gear, late research time is also shorter, and domestic and foreign researchers on the understanding of the plastic gear performance and application very immature, but to imitate and improve on the basis of the steel gear. Therefore, the experimental study of plastic gear is necessary. Plastic material with Bo, the elastic energy, and thus has obvious noise reduction and vibration damping performance. In fact, for the transmission of power in terms of gear when the gear bodys natural frequencies and the frequency of exciting force is very close to the even drill the plastic material gear also have a resonance and noise 2 4321-437A. Therefore, during the plastic gear design, the vibration characteristics of the study is necessary. We use ANSYS software to gear finite element model, modal analysis, mode shapes and natural frequency of the plastic gears and alloy gear to provide a basis for the structural design and optimization of gear.1 A gear modal analysisModal analysis is used to determine the natural frequency of the vibration characteristics of structures or machine parts in the design and mode shapes. Withstand dynamic bearing load structure design parameters 3 4321-4324. Finite element analysis software ANSYS, modal analysis is a linear analysis of prestressed structure and cyclic symmetry structure modal analysis, modal analysis process is divided into four steps: modeling, loading and solving, extended modal and results post-processing. 1.1 gear finite element modelANSYS provides three kinds of ways: to generate a model generation method with ANSYS to create solid model, the model established by the input model system. The direct generation method suitable for small, simple model, the leaders of the other systems if the model is not suitable for meshing, requires a lot of repair work. Gear model is relatively complex, suitable for solid modeling method. Known by the finite element theory, the solid model can not be directly used for finite element calculation, so take it mesh to generate a finite element model, the mesh will directly affect the accuracy of the finite element calculation results .Define the element type for the Structural solid Brick 2 ( node 95, the input gear parameters, create the key points, connecting key points generated gear contour, gear tooth surface generated by the contour, surface generation bodies drag along the segment, showing a single tooth geometric mode J, division of a single tooth mesh gear is the structure of the body of the loop extension cycle to generate the finite element model of the plastic gears in Figure 1 shows, the finite element model of the number of nodes on a single tooth 3f tS8 . unit number 1994.1.2 gear finite element model of the moldState analysisModal analysis of ANSYS, you must specify the elastic modulus EX. ANSYS11.0 seven kinds of modal extraction method: the Block Ianczoe (block, t the sos France), Subspace is (subspace method) IowerDvnamics (source of power law), Reduced (reduction method), Un2symmetric (non-symmetric France), the Dam Network (damping France), QRDam network (Qlt damping method). In this article to Block lanczos method to extract modal. Gear model is built, its modal analysis, modal analysis of the gear. Purpose is to find the order natural frequency of the gear and its corresponding vibration mode, and therefore does not need to load, only degrees of freedom constraints. Constraints: the gear inner hole circle cylinder constraint: s:. Set of modal extraction method for the Block Canczos France, set up to extract the number of modes of 5 want to get the unit to solve the results need to open the calculate elem re-salts, the frequency range specified modal extraction 0 100 000, specify the mode state extraction method, ANSYS automatically select the appropriate equation solver.Figure 1 gear finite element modelSolve the calculations are complete, view the solution results. Modal analysis results in order to get the whole gear model, the modal expansion, extended for solving the advantages of each order, for the obtained natural frequency. Solving r its corresponding mode shape is reflected in the natural frequency of each node of the gear relative displacement and relative stress conditions. Set the mode of state expansion, extended frequency range 0 100 000. Again into the solver to calculate and view the solution results, including the natural frequency, r, has been extended modes and the corresponding relative) il, power distribution2 Define the material properties2.1 Structure of alloy steel Alloy steel with high strength, high toughness, wear resistance, corrosion resistance, low temperature, high temperature, non-magnetic and other special properties. Used to produce withstand dynamic load and heavy load of automobile transmission gear and car rear axle gear commonly used in power transmission, and high reliability of mechanical equipment in the 2.2 engineering materials.Engineering materials, plastic is characterized by: (1) self-lubrication, lubrication operation when necessary; (2) to reduce noise; light weight with excellent corrosion resistance of two-phase metal gears, plastic gears, light weight industrial noise , resistant to wear, no lubrication, forming a more complex shape, mass production and low cost but because of two plastic itself is demanding, the work environment more sensitive to temperature, the relative metal strength is weak. Thus, the plastic gear at the same time have low accuracy, short life, the use of environmental requirements of the disadvantages. Article lists the parameters and material parameters of the mechanical properties of the two materials.3 the two materials modal analysis results and compare3.1 Modal analysis results After the definition of material properties, the modal analysis of finite element model of the gear to get before the modal natural frequency to enter PaSI1 processor to view the solution results from the results seen, the mode shapes of the plastic gears with alloy steel gear the same type listed gear mode shapes shown in Figure 2.Figure 2 modal graphTo reverse the type, the axis of its deformation in the end face of the performance for the relative torsional vibration mode; modal performance for radial vibration: the vibration of the side surface showing polygon shapes, almost no axial vibration. Due to space limitations, gear vibration data not shown, the vibration mode shapes of folded shapes, the performance of axial rules of wave modes, the rule in the end face of the polygon shapes.4 gear natural frequency testPercussion method and the two kinds of resonance method, using the percussion method is usually used to test the gear natural frequency, and specific practices: test gear is hung with a thin non-metallic line up, with adhesive accelerometer installed in the the gear face, followed by a charge amplifier to amplify the signal, the output signal through the the oscillator light oscilloscopes records will be collected vibration signal input spectrum analyzer, and then playback the signal on the oscilloscope to spectrum analyzer, and then fast Fourier any TT ) transform to obtain its transfer function. Will be repeatedly measured transfer function curve fitting and parameter identification, can be obtained by the test-gear vibration modal parameters (natural frequencies, mode shapes, damping ratio, etc.).5 ConclusionANSYS software gear finite element model, modal analysis, and the two materials Gear modal analysis results were compared. The following conclusions: plastic gears with steel gears, the maximum stress in the two-tooth gap tooth root parts of the gear tooth root parts to withstand the maximum load, but the maximum stress of the alloy steel gear is much larger than the maximum stress of plastic gear value is about 103 times. The minimum stress in the gear shaft fixed position. The relative to the steel gear, plastic gear natural frequency is low; two materials gear order modal frequency tended to increase with the order increases, and obtained the plastic gears with steel gears, the natural frequencies and mode shapes type, to test the final analysis, the calculation results with the experimental results, created using the ANSYS model and computational results are correct.来源：JH.MINGTING; Analysis based on the ANSYS metal gears and plastic gears inherent vibration characteristics compared; MATERIALS SCIENCE 38 (2003)339341外文翻译基于ANSYS的金属齿轮与塑料齿轮固有振动特性的对比分析姓名：*班级：*摘要:用ANSYS软件建立齿轮有限元模型，对其进行模态分析，分别得到塑料齿枪与钢质齿轮模态的固有频率和振型图，进行对比分析。得到的结论为齿轮的动态设计和齿轮结构相关设备的故障诊断提供了依据。关健词:塑料齿轮钢质齿枪模态分析振动特性0引言齿轮传动是机械传动中最主要的一类传动，齿轮传动因其效率高、结构紧凑、传动比稳定而在工程中得到广泛应用。由于高性能工程塑料的发展，加速了以塑代钢的应用进程，使得塑料在机械工程领域应用的比例不断增大，制作齿轮的材料也不再限于金属材料，已发展到塑料齿轮。国内外有关塑料齿轮的应用与理论研究已进行了许多，但和钢质齿轮相比，出现时间较晚，研究时间也较短，而且国内外研究人员对塑料齿轮性能和应用等方面的了解还很不成熟，只是在钢质齿轮的基础上模仿和改进。所以，对塑料齿轮进行实验研究很有必要。由于塑性材料具有勃弹性能，因而具有较明显的降噪和减振性能。实际上，对于传递动力的齿轮来讲，当齿轮本体的固有频率和激振力频率非常接近的时候，即使是钻塑性材料齿轮，也会产生共振和较大的噪声2 34321-437A。所以，在进行塑料齿轮设计时，对其进行振动特性的研究是很有必要的。我们利用ANSYS软件建立齿轮有限元模型，对其进行模态分析，得到塑料齿轮和合金钢齿轮的振型和固有频率，为齿轮的结构设计和优化提供依据。1齿轮模态分析模态分析用于确定设计中的结构或机器部件的振动特性即固有频率和振型。是承受动态承载荷结构设计中的重要参数34321-4324。在有限元分析软件ANSYS中，模态分析是一个线性分析，可以对有预应力的结构和循环对称结构进行模态分析，模态分析过程主要分为4个步骤:建模、加载及求解、扩展模态和结果后处理。1.1齿轮有限元模型的建立ANSYS提供了3种生成模型的方式:直接生成法、用ANSYS创建实体模型、输人其它模型系统建立的模型。直接生成法适合小型、简单的模型，其它系统导人的模型如果不适于网格划分，则需要大量的修补工作。由于齿轮模型相对来说比较复杂，适合采用实体建模法。由有限元理论可知，实体模型是无法直接用来进行有限元计算的，故需对它进行网格划分以生成有限元模型，而网格划分的好坏将直接影响有限元计算的结果的精度。定义单元类型为Structural solid, Brick 2(node 95,输人齿轮参数，创建关键点，连接关键点生成齿轮轮廓线，由轮廓线生成齿轮齿面，沿线段拖拉面生成体，显示单个齿形几何模J，对单个轮齿划分网格。由于齿轮是循环体结构，对单个轮齿进行周期扩展，生成塑料齿轮有限元模型如图1所示，有限元模型节点数为3ftS8个。单元数为1994个。1.2齿轮有限元模型的模态分析过程在ANSYS的模态分析中，必须指定弹性模量EX。ANSYS11.0提供了7种模态提取方法:Block Ianczoe(分块,t.索斯法),Subspace(子空间法)IowerDvnamics(动力源法)、Reduced(缩减法)、Un2symmetric(非对称法)、Dam网(阻尼法)、QRDam网( Qlt阻尼法)。我们在本文中采用Block lanczos法提取模态。图1齿轮有限元模型齿轮模型建好后，对其进行模态分析，对齿轮进行模态分析的目的是求出齿轮各阶固有频率及其对应主振型，因此不需要对其加载，只需对进行自由度约束。约束条件:齿轮的内孔圆柱面被约束:s:。设置模态提取方法为Block Canczos法，设置提取模态数为5，由于想要得到单元求解结果，需要打开“calculate elem re-salts，指定模态提取的频率范围为0一100000，指定模态提取法后，