磨辊轴过盈联接系统可靠性设计

考虑磨辊轴过盈联接设计参数的随机性,将磨辊轴过盈联接强度、辊轴强度、辊体强度三种强度的可靠度视为一个串联系统,提出了基于系统可靠度的磨辊轴过盈联接可靠性设计模型。计算结果表明,就系统可靠度和重量而言,这里给出的六种设计方案均优于二种目前广为采用的设计方案。     

过盈联接的可靠性研究

考虑失效相关,推导了过盈联接的可靠度计算通用公式,并介绍了可靠度计算的方法,使过盈联接的可靠性设计更趋合理.     

过盈联接的可靠性研究

本文考虑失效相关,推导了过盈联接的可靠度计算通用公式,并介绍了可靠度计算的方法,使过盈联接的可靠性设计更趋合理与完善。     

滚子输送链联接牢固度的可靠性优化设计

根据过盈联接设计和可靠性优化的基本理论，以联接可靠度最高为目标，对滚子输送链联接牢固度的可靠性进行了优化分析，通过实例进行了设计验证。分析结果可为选择链节合理的过盈配合精度提供理论依据。     

多层过盈联接的可靠性稳健设计研究

基于厚壁圆筒理论,通过分析多层过盈联接的几何关系,推导得出结合压力与过盈量的矩阵表达式,明确了多层过盈联接力学模型的函数关系。以风电锁紧盘作为多层过盈联接的具体实例,根据应力-强度模型和失效机理,建立了锁紧盘可靠度数学模型,同时确定了锁紧盘可靠度相对基本随机变量的灵敏度;依据可靠度对基本随机变量灵敏度平方和最小原则及满足最小可靠度的原则,建立了风电锁紧盘可靠性稳健设计数学模型;为多层过盈联接过盈量的确定提供一种评价指标,进一步精确过盈量的具体取值。通过对设计参量的分析,确定摩擦因数、装配间隙、屈服强度对锁紧盘可靠度的影响。以某型号风电锁紧盘为例,对经典设计方法与可靠性稳健设计方法进行了比较。结果表明,基于可靠性稳健设计的锁紧盘,其可靠度提高了47.6%,且除屈服强度外,可靠度对随机变量的灵敏度均小于经典设计方法,稳健性更强。最后,通过试验验证了基于文中设计方法的锁紧盘能够满足实际运转过程中给定的工况要求。     

过盈联接的模糊可靠性设计及应用

基于模糊数学的原理和方法 ,在进行可靠性分析的基础上 ,建立了过盈联接的模糊可靠性设计计算模型。对过盈联接中的轴、联接和轮毂经典可靠性计算以及隶属函数的确定等进行了分析 ,并以蜗轮轴过盈联接为例 ,进行了模糊可靠度计算。经理论和应用表明该方法具有广泛的实用价值和应用前景     

过盈联接的模糊可靠性设计及应用

基于模糊数学的原理和方法,在进行可靠性分析的基础上,建立了过盈联接的模糊可靠性设计计算模型。对过盈联接中的轴、联接和轮毂经典可靠性计算以及隶属函数的确定等进行了分析,并以蜗轮轴过盈联接为例,进行了模糊可靠度计算。经理论和应用表明该方法具有广泛的应用价值和应用前景。     

基于系统强度可靠度的磨辊轴过盈联接模糊可靠性设计

将磨辊轴过盈联接强度、辊轴强度、辊体强度三种强度的可靠度视为一个串联系统 ,综合考虑磨辊轴过盈联接设计参数的随机性、广义强度安全与失效阈值的模糊特性 ,提出了基于系统强度可靠度的磨辊轴过盈联接模糊可靠性设计模型。计算结果表明 ,就系统可靠度和重量而言 ,本文给出的六种设计方案均优于二种目前广为采用的设计方案     

基于理论概率法的轴毂过盈联接的精度设计

在轴毂过盈联接中,合理确定过盈量的大小是保证过盈联接可靠性的关键。本文通过引入理论概率论的原理和方法,把轴毂过盈联接的配合精度与工作可靠度联系起来,推导出两者之间的内在关系,为正确使用国家标准进行精度设计提供了理论依据。     

过盈联接的模糊可靠性分析与仿真研究

过盈联接的可靠性取决于实际过盈量、最小极限过盈量和最大极限过盈量之间的关系,影响因素包括材料的力性能、材料副的摩擦特性、载荷特性以及联接各部分的几何尺寸,计算公式十分复杂,即使忽略设计中实际存在的模糊信息和各随机因素均服从简单正态分布,也很难用常规方法确定其可靠度的解析解.根据常规可靠性理论和模糊数学方法,建立过盈联接模糊可靠性分析的数学模型,并在此基础上建立一套过盈联接可靠性计算机数字仿真的方法,编写相应的计算机程序,并通过实例对过盈联接可靠性进行仿真研究.     

基于可靠性优化技术的计算和选择过盈配合的新方法

提出一种计算和选择过盈配合的新方法。该方法首先按照可靠性优化设计理论确定满足预定可靠性要求的过盈量和结合长度，然后根据过盈配合国家标准选择标准配合，再对结合长度进行一维优化，可以经济地满足预定的可靠性要求，彻底摆脱用传统方法计算过盈联结的复杂性和选择过盈配合的盲目性。     

机械可靠性设计的最优化方法及其应用研究

按照应力，强度分布干涉理论，对多维机械可靠性设计进行系统的研究，对可能存在的各种情况进行分析并提出处理意见，将多维可靠性设计转化为求解非线性方程组，并且最优化方法求解。作为方法的应用，最后给出了过盈联结可靠性设计的实例。这里法不仅适用于机械零部件的设计，对机械系统的设计也同样适用。     

箱形梁焊接结构安全可靠性分析方法

根据概率损伤容限分析及可靠性理论，提出了一种基于箱形梁的焊接结构安全可靠性分析方法，给出了该类结构疲劳裂纹随机扩展过程中较普适的α—αc干涉模型和结构疲劳可靠性表达式。在给定与疲劳寿命有关的各参数条件下求得动态可靠性曲线，从而在箱形梁类的焊接结构设计中，可以很方便地根据可靠性要求，确定或选择设计参数，并在设备使用过程中按周期进行检查和维修。     

Design optimization of a wind turbine gear transmission based on fatigue reliability sensitivity

Fatigue failure of gear transmission is one of the key factors that restrict the performance and service life of wind turbines. One of the major concerns in gear transmission under random loading conditions is the disregard of dynamic fatigue reliability in conventional design methods. Various issues, such as overweight structure or insufficient fatigue reliability, require continuous improvements in the reliability-based design optimization (RBDO) methodology. In this work, a novel gear transmission optimization model based on dynamic fatigue reliability sensitivity is developed to predict the optimal structural parameters of a wind turbine gear transmission. In the model, the dynamic fatigue reliability of the gear transmission is evaluated based on stress–strength interference theory. Design variables are determined based on the reliability sensitivity and correlation coefficient of the initial design parameters. The optimal structural parameters with the minimum volume are identified using the genetic algorithm in consideration of the dynamic fatigue reliability constraints. Comparison of the initial and optimized structures shows that the volume decreases by 3.58% while ensuring fatigue reliability. This work provides new insights into the RBDO of transmission systems from the perspective of reliability sensitivity.     

Multi-source data fusion based small sample prediction of gear random reliability

In order to predict gear random reliability under the condition of small samples, a model of multi-source data fusion is presented. The gear source data is divided into homologous gear data (HGD) and different source gear data (DSGD) according to their characters. The corresponding algorithms are separately deduced: when in the case of HGD, the grey relational analysis is used to establish the transformation model of gear stress and the model error is considered; when in the case of DSGD, differences in parameters/structure/working conditions are took into account for the purpose of stress transformation. Based on these works, a number of effective stress samples are obtained and distribution parameters of gear stress are estimated by maximum likelihood method. In addition, gear strength reliability is deduced by stress ?? strength interference model and Monte Carlo sampling. The example shows that gear random reliability can be predicted by work of this study under the condition of small samples; also, accuracy of this method is proved by comparing the result of this work and those of other three methods.     

工程机械液压系统可靠性设计分析

现代工程机械的主要工作装置大多采用液压控制技术实现,因此液压系统的可靠性往往对整机的可靠性产生很大的影响。利用系统工程理论,分析了液压系统可靠性的几个参数,定量地分析了工程机械液压系统的可靠性模型,为使系统具有高有效度,液压系统的可靠性设计和维修性设计应得以充分重视,并提出了具体措施。     

Thermal reliability research on entire roller-embedded shapemeter roll

The reversible cold-strip flatness was detected by an entire roller-embedded shapemeter roll. During detection, the contact condition of the interference fit surface (between the top surface of the framework and the inner hole surface of the roll body) changes with increasing thermal deformation. This, in turn, affects the thermal reliability of the roll. Temperature field and thermal deformation models of the shapemeter roll were established based on heat transfer and thermal elasticity theory; the temperature difference, thermal displacement difference, and the interference fit value associated with the interference fit surfaces were derived from these models. A seven-pass cold reversible rolling process in a 1050 cold rolling mill was experimentally and theoretically analyzed. These analyses revealed that the temperature difference between the interference fit surfaces is largest (maximum value 20 °C) during the third rolling pass and normal functioning of the shapemeter roll is prevented. This occurred only in the third rolling pass. An optimal design model of the initial interference fit value was developed to ensure contact between the interference fit surfaces. The optimum results showed that an initial interference fit value of 0.06 mm yields a maximum temperature difference of only 5 °C in the third rolling pass. More importantly, the shapemeter roll functions normally and its thermal reliability is improved.     

数控加工工艺的可靠性优化设计

运用动态规划原理,提出了解决数控加工工艺规划(CAPP)可靠性优化设计的方法,并给出了具体的算法和应用 实例。