减速器动力学分析及可靠性评估方法研究

发布时间：2019-04-08 11:08

【摘要】：本课题的三级减速器来源于某型舰船炮塔回转机构。由于制造和装配误差的存在,减速器的性能存在不确定性,这对舰炮射击的准确性以及工作可靠度造成不良影响。为解决此问题,本文采用LS-DYNA对三级减速器模型进行显式动力学仿真,并为可靠性评估提供试验数据。本文的主要内容如下：(1)考虑零件的各类非线性随机因素,排除传统CAE分析常使用的人为假定,对三级减速器进行动力学分析。得到动态工作过程中齿轮的弯曲应力和接触应力,真实反映了减速器工作过程中各零部件的受力状态和动态性能。通过多次仿真,得到减速器系统可靠性评估所需的大量数据。(2)介绍可靠性原理的相关观点,阐述了两类基本求解方法。根据减速器故障模式研究,选取最易发生故障的齿轮作为主要研究对象。确定齿轮应力和疲劳强度的分布类型及参数后,根据应力-强度干涉模型,求解出各齿轮在给定有限寿命下的可靠度。(3)用响应面法求解出以4个非线性因素作为随机变量的接触应力表达式,由此得到极限状态方程。提出一种抽样方法,给出其分析步骤并推导出可靠度的计算方法。使用Matlab对具体实例进行仿真计算,通过实验结果对比各种方法的优劣,表明本文所采用方法的正确性与实用性。
[Abstract]:The three-stage reducer of this subject comes from a type of ship turret rotary mechanism. Due to the existence of manufacturing and assembly errors, the performance of the reducer is uncertain, which has an adverse effect on the accuracy and reliability of naval gun firing. In order to solve this problem, the explicit dynamic simulation of the three-stage reducer model is carried out by using LS-DYNA, and the experimental data are provided for the reliability evaluation. The main contents of this paper are as follows: (1) considering all kinds of non-linear random factors of parts, excluding the artificial assumption commonly used in traditional CAE analysis, the dynamic analysis of three-stage reducer is carried out. The bending stress and contact stress of gear in the dynamic working process are obtained, which reflect the stress state and dynamic performance of each component in the working process of the reducer. A large number of data needed for reliability evaluation of reducer system are obtained through many simulations. (2) the related viewpoints of reliability principle are introduced and two basic solutions are expounded. According to the research of gear reducer fault mode, the gear which is most prone to failure is chosen as the main research object. After determining the distribution types and parameters of the stress and fatigue strength of the gear, according to the stress-strength interference model, The reliability of each gear under a given finite life is solved. (3) the contact stress expression with four nonlinear factors as random variables is solved by the response surface method, and the limit state equation is obtained. This paper presents a sampling method, gives its analysis steps and deduces the calculation method of reliability. The Matlab is used to simulate and calculate the concrete examples. The experimental results show the correctness and practicability of the method used in this paper by comparing the advantages and disadvantages of various methods.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH132.46

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