钢板弹簧的可靠性分析的参数灵敏度

讨论了钢板弹簧的可靠性分析的参数灵敏度问题,提出了可靠性灵敏度分析的计算方法,研究了正态分布设计参数的改变对钢板弹簧可靠性的影响,为钢板弹簧的可靠性设计提供了理论依据。     

具有等厚主片变截面钢板弹簧优化设计

建立了具有等厚主片少片变截面钢板弹簧优化设计模型,探讨了利用最优化方法进行具有等厚主片少片变截面钢板弹簧设计可靠性,并以某轻型客车前悬架刀例,设计了变截面钢板弹簧。     

弹簧闭锁装置可靠性分析及优化

针对参数存在的随机分布特性,应用概率论和数理统计的方法对弹簧进行可靠性分析,并建立了闭锁装置弹簧基于可靠性的优化设计模型。基于Visual Basic语言编程,用模拟退火算法优化得到弹簧参数。运用有限元法分析闭锁装置工作过程,仿真结果验证了优化结果的合理性。     

基于内点罚函数法的非对称钢板弹簧优化设计

以某微客开发过程中的非对称少片变截面钢板弹簧为主要研究对象,进行钢板弹簧的优化设计及计算,建立该钢板弹簧的优化设计数学模型,并以内点罚函数法的优化设计理论为基础对钢板弹簧进行优化设计,在满足强度条件和刚度条件等约束的要求下,使钢板弹簧的质量减少,达到轻量化优化设计的目的。并将优化结果和ABAQUS计算结果进行比较,结果显示:优化结果不仅保持了钢板弹簧的计算精度,还可以提高钢板弹簧的计算效率。     

碟形弹簧的模糊可靠性优化设计研究

碟形弹簧模糊可靠性优化设计方法综合应用了模糊可靠性设计理论和优化设计技术,因其同时考虑了碟形弹簧各设计参数的离散性和设计边界的模糊性,设计出的碟形弹簧更趋经济合理,对于设计最佳碟形弹簧结构,具有较大的现实际意义.     

基于可靠性技术的汽车钢板弹簧设计

在可靠性设计理论的基础上,对汽车钢板弹簧各参数进行了确定,并在给定可靠度的条件下,进行了可靠性设计。在此基础上,研究开发了一种汽车钢板弹簧可靠性设计计算软件,结果表明设计是合理可靠的。     

利用ANSYS进行变截面板簧的优化分析

本文应用ANSYS参数化建立了变截面钢板弹簧的有限元模型,对单片簧进行优化设计,并分析其刚度和强度情况。     

碟形弹簧的可靠性优化设计

随着机械可靠性设计的发展,机械产品的可靠性设计自然也存在一个优化问题,从而使设计的产品在可靠度满足规定的前提下,其功能参数获得优化解。本文将现代设计方法中的可靠性设计理论与最优化技术相结合,提出了碟形弹簧的可靠性优化设计方法以弥补常规优化设计的不足。文中按照碟形弹簧的设计要求和工作条件,选定设计变量,建立了目标函数和约束条件的数学模型,并给出了碟形弹簧的可靠性优化实例。     

多片钢板弹簧的优化设计

建立了多片钢板弹簧优化设计的数学模型 ,利用MATLAB工具箱进行优化 ,并以实例设计计算了多片钢板弹簧     

基于ADAMS的混合动力城市客车钢板弹簧动力学建模及分析

钢板弹簧的建模质量影响着车辆仿真的正确性,基于ADAMS/CAR建立电动客车的钢板弹簧模型,并导入ADAMS/VIEW中求解出钢板弹簧的刚度曲线,为钢板弹簧的等效处理提供数据支持。同时建立钢板弹簧前悬架仿真模型,进行车轮同向激振分析和车轮反向激振分析,得到悬架的刚度曲线,为下一步钢板弹簧悬架的优化设计提供理论依据。     

基于可靠性约束的变载荷圆柱螺旋压缩弹簧的优化设计

利用优化设计和可靠性设计方法,提出变载荷圆柱螺旋压缩弹簧的可靠性优化设计方法。将弹簧的一些设计变量作为随机变量来处理,以可靠性指标作为约束条件,建立了可靠性优化的数学模型,利用MATLAB的优化工具箱得到设计的结果。计算算例的结果表明,此方法更接近于工程实际,是一种更具有工程实用价值的综合设计方法。     

Dispersion of the mechanical parts performance indicators based on the concept of random vector

To solve the precision and reliability problem of various machinery equipments and military vehicles,some military organisations,the industrial sector and the academia at home and abroad begin to pay attention to the statistical distribution of machining dimensions,material properties and service loads,and the system reliability optimization design with constraints and reliability optimization design of various mechanical parts is studied in this way.However,the above researches focus on solving the strength and the life problem,and no studies have been done on the discrete degree and discrete pattern of other performance indicators.The concept of using a random vector to describe the mechanical parts performance indicators is presented;characteristics between the value of the vector variance matrix determinant and the sum of the diagonal covariance matrix in describing the performance indicators of vector dispersion are studied and compared.A clutch diaphragm spring is set as an example,the geometric dimension indicator is described with random vector,and the applicability of using variance matrix determinant and variance matrix trace of geometric dimension vector to describe discrete degree of random vector is studied by using Monte-Carlo simulation method and component discrete degree perturbation method.Also,the effects of different components of diaphragm spring geometric dimension vector on the value of covariance matrix determinant and the sum of covariance matrix diagonal of diaphragm spring performance indicators vector are analyzed.The present study shows that the impacts of the dispersion of diaphragm spring cone angle on every performance dispersion are all ranked first,and far exceed that of other dimension dispersion.So it must be strictly controlled in the production process.The result of the research work provides a reference for the design of diaphragm spring,and also it presents a proper method for researching the performance of other mechanical parts.     

基于混沌搜索的溢流阀调压弹簧的模糊可靠性优化设计

在充分考虑了溢流阀调压弹簧各设计参数的模糊性和随机性的基础上,结合利用混沌运动的遍历性、随机性、规律性等特点,探讨了基于混沌搜索的溢流阀调压弹簧的模糊可靠性优化设计方法。     

基于多目标优化策略的螺旋弹簧可靠性稳健优化设计

应用可靠性稳健优化设计理论和多目标决策方法,将车辆螺旋弹簧的可靠性稳健优化设计转化为多目标问题.运用层次分析法选取粒子群算法中的全局极值和个体极值,提出基于层次分析法的多目标粒子群算法,并将该算法应用于可靠性稳健优化设计的多目标模型求解中.与传统方法相比,该方法简便、易行,并能迅速准确地得到车辆螺旋弹簧的可靠性稳健优化设计信息.     

Reliability-based robust design optimization of vehicle components,Part I: Theory

The reliability-based design optimization, the reliability sensitivity analysis and robust design method are employed to present a practical and effective approach for reliability-based robust design optimization of vehicle components. A procedure for reliability-based robust design optimization of vehicle components is proposed. Application of the method is illustrated by reliability-based robust design optimization of axle and spring. Numerical results have shown that the proposed method can be trusted to perform reliability-based robust design optimization of vehicle components.     

碳纤维增强复合材料加固中心孔钢板综合优化

采用多级优化方法对碳纤维增强复合材料加固中心孔钢板进行优化设计,首先,采用拉丁超立方方法选取试验样本点,利用移动最小二乘法拟合近似代理模型,在代理模型基础上采用自适应响应面优化方法优化基本铺层厚度;然后,结合复合材料制造约束条件,利用Optistruct对铺层顺序进行优化,得到最佳铺层设计方案。经过多级优化设计后,钢板中心孔处应力分布更合理,最大Mises应力减小了56.6%。     

考虑疲劳可靠性的回转压头锁紧碟簧稳健设计

结合可靠性设计理论和稳健设计技术,以碟簧的疲劳可靠性为约束,碟簧组的轴向载荷及其方差为目标函数,建立了夹紧装置碟簧的稳健性优化模型,并进行了稳健优化。同时考虑了碟形弹簧各设计参数的不确定性对碟簧疲劳寿命和碟簧特性的影响,提高了设计结果的经济性和可靠性。     

非正态随机参数的机械零件的可靠性稳健设计

将可靠性优化设计理论、可靠性灵敏度技术与稳健设计方法相结合,讨论具有非正态随机参数的机械零件的可靠性稳健设计问题,提出可靠性稳健设计的计算方法。将可靠性灵敏度溶入可靠性优化设计模型之中,将可靠性稳健设计归结为满足可靠性要求的多目标优化问题。利用四阶矩技术在基本随机参数的前四阶矩已知的情况下,通过计算机程序可以实现具有非正态随机参数的机械零件的可靠性稳健设计,迅速准确地得到具有非正态随机参数的机械零件的可靠性稳健设计信息。数值算例表明文中所提方法是一种非常方便和实用的可靠性稳健设计方法。     

Reliability-based robust optimization design of automobile components with non-normal distribution parameters

In the reliability designing procedure of the vehicle components, when the distribution styles of the random variables are unknown or non-normal distribution, the result evaluated contains great error or even is wrong if the reliability value R is larger than 1 by using the existent method, in which case the formula is necessary to be revised. This is obviously inconvenient for programming. Combining reliability-based optimization theory, robust designing method and reliability based sensitivity analysis, a new method for reliability robust designing is proposed. Therefore the influence level of the designing parameters’ changing to the reliability of vehicle components can be obtained. The reliability sensitivity with respect to design parameters is viewed as a sub-objective function in the multi-objective optimization problem satisfying reliability constraints. Given the first four moments of basic random variables, a fourth-moment technique and the proposed optimization procedure can obtain reliability-based robust design of automobile components with non-normal distribution parameters accurately and quickly. By using the proposed method, the distribution style of the random parameters is relaxed. Therefore it is much closer to the actual reliability problems. The numerical examples indicate the following: (1) The reliability value obtained by the robust method proposed increases (>0.04%) comparing to the value obtained by the ordinary optimization algorithm; (2) The absolute value of reliability-based sensitivity decreases (>0.01%), and the robustness of the products’ quality is improved accordingly. Utilizing the reliability-based optimization and robust design method in the reliability designing procedure reduces the manufacture cost and provides the theoretical basis for the reliability and robust design of the vehicle components.