基于灵敏度分析的动力总成悬置系统优化

针对某车动力总成悬置系统固有频率偏高和振动耦合严重的问题,建立了该车动力总成悬置系统6自由度模型,并对悬置元件的主刚度参数进行了灵敏度分析.以分析找出的少量敏感参数为设计变量,结合振动解耦和固有频率匹配理论,对该悬置系统参数进行了优化,并对优化前后的动力总成悬置系统进行了台架试验.结果表明,优化后的悬置系统隔振能力有了...     

基于能量解耦的汽车动力总成悬置系统优化设计

为了解决某款车的动力总成悬置系统振动问题,结合多自由度系统振动解耦和固有频率匹配理论,应用ADAMS建立动力总成悬置系统模型进行仿真分析。同时以解耦率目标函数,通过MATLAB软件中的遗传算法对悬置系统进行了优化。结果表明,对悬置刚度进行优化能有效提高解耦率,改善系统的NVH性能。     

客车动力总成悬置系统减振特性与优化研究

文章通过测量混合动力公交车动力总成的模型参数,在ADAMS软件中建立6自由度悬置系统振动模型,并对模型进行频域的仿真分析,得到悬置系统的固有特性及减振特性,并从系统固有频率配置及振动解耦角度分析该悬置系统的振动特性。由于受整车布置的影响,本文以悬置的刚度参数和发动机前悬置的安装角度为设计变量,以能量解耦为优化目标进行优化设计。     

某微型车驾驶室座椅导轨怠速异常振动分析与改进

建立了动力总成悬置系统刚体动力学模型并获得系统固有频率和能量分布,由整车状态下模态试验得出了动力总成悬置隔振系统的运行模态参数,通过分析找到了某微型车座椅导轨怠速异常振动的原因。对该车型悬置系统进行了优化,重新制作样件进行了验证。试验结果表明,现代测试手段和动态仿真分析技术相结合,能有针对性的对悬置系统进行改进设计并缩短整车NVH调试周期。     

动力总成悬置系统优化及稳健性分析

为改善动力总成悬置系统的隔振性能,以某车辆的悬置系统为研究对象,在扭矩轴坐标系下建立6自由度振动分析数学模型,阐述能量解耦的计算方法。以悬置系统振动解耦率和固有频率分布为设计目标,以悬置刚度为设计变量,采用遗传算法对该悬置系统进行优化设计,并且用蒙特卡罗模拟方法对优化结果进行稳健性分析。结果表明,优化后悬置系统的振动解耦率和频率满足设计要求,且系统设计稳健性较好。     

基于能量法解耦的动力总成悬置系统优化设计

通过建立汽车动力总成悬置系统的动力学模型,进行了能量法解耦理论的推导,并将该方法应用到某客车动力总成悬置系统的改进中,结果表明,垂向和绕发动机曲轴转动方向的振动和其他自由度方向的振动基本实现解耦。     

基于激励解耦法的汽车动力总成悬置系统优化设计

动力总成悬置系统对改善整车的噪声和振动起着非常重要的作用。文中以某国产轿车为例,建立了动力总成悬置系统与底盘的耦合模型,并根据解耦应该与某一特定的激励有关的理论,以转矩轴方向和垂直方向的能量解耦度为目标,运用改进的非支配排序遗传算法对悬置系统参数进行优化设计。最后在整车中对优化后的悬置系统进行仿真验证,证明所采用方法的可行性。     

基于MATLAB的悬置系统优化设计及软件开发

分析悬置受力,建立了动力总成悬置系统6自由度数学模型。通过综合能量解耦和固有频率的合理布置两个目标函数,建立了多目标优化数学函数。在此基础上,借助MATLAB的GUI功能和工具箱中优化函数对悬置系统进行了优化设计。通过在某自主品牌轿车悬置设计中的应用表明,优化后的悬置系统有效实现了固有频率的合理配置和6个方向的解耦,达到了优化目的。通过实车试验可知,优化后的悬置系统隔振性能提高,整车NVH性能改善。     

某三缸发动机悬置的优化设计

就某车型配备三缸发动机整车振动过大的问题,对悬置系统进行改进设计,分析动力总成及悬置系统参数。通过建立目标函数,利用能量解耦法,对悬置刚度进行计算和优化,使该车的整车振动状况得到较大改善。     

基于改进多岛遗传算法的动力总成悬置系统优化设计

通过动态调节交叉和变异概率克服多岛遗传算法的早熟现象,并加入退火操作提高算法的局部寻优能力形成改进的多岛遗传算法。综合考虑动力总成悬置系统能量解耦和振动传递率,以悬置刚度参数为设计变量,以固有频率合理分配为约束条件,构造了基于改进的多岛遗传算法的多目标优化数学模型。优化实例的分析结果表明,改进后的算法能够得到全局最优解,优化后悬置系统刚度稳健性较好。实车试验结果表明整改后的悬置系统隔振性能得到一定程度上的提高。     

Engine mount optimisation for vibration isolation in motorcycles

This paper presents a comprehensive model to capture the in-plane dynamics of a motorcycle system to evaluate the quality of its vibration isolation, and the design of an engine mount system. The model consists of two main structural components, the frame and the swing-arm, as well as the power-train assembly, engine mounts connecting the power-train to the frame, and the front-end assembly. The model accounts for frame and swing-arm flexibility using reduced order finite-element models. The power-train assembly is modelled as a rigid body connected to the frame through the engine mounts and to the swing-arm through a shaft assembly. The engine mounts are modelled as tri-axial spring-damper systems, and the front-end assembly is modelled as a lumped mass. The complete vehicle model is used to solve the engine mount optimisation problem, so as to minimise the total force transmitted to the frame while meeting packaging and other constraints. The mount system parameters – stiffness, position and orientation vectors – are used as design variables for the optimisation problem. The imposed loads include forces and moments due to engine imbalance as well as loads transmitted due to high amplitude, low frequency bump loads, through the tyre patch. Since packaging constraints play a significant role in a motorcycle layout, it is, therefore, important to determine the displacement envelope of the power-train under extreme loading conditions to ensure clearance with other components around the power-train. A motorcycle mount system should ideally be able to isolate the frame under steady-state loading conditions and at the same time limit the maximum excursion of the power-train under transient loading conditions.     

发动机悬置刚度优化设计

利用多体动力学软件ADAMS(Automatic Dynamic Analysis of Mechanical System)建立了某动力总成悬置系统6自由度刚体动力学模型。通过线性模态提取的方法,结合某发动机实际,以力传递率最小为目标函数,悬置刚度值作为设计变量,在强迫激励下,利用二次序列规划法SQP(Sequential Quadratic Programming)进行优化,针对对隔振影响较大的参数进行调整,最终提出悬置刚度设计方案,达到了使传递力有效值降低30%左右的良好效果。     

In situ body mount optimization: theory and experiment

In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle.     

发动机总成悬置系统的仿真优化设计

对于某轿车在怠速时发动机总成振动较大的情况,建立发动机悬置系统参数化模型,利用能量法基本原理,通过机械系统动力学仿真软件ADAMS对该发动机悬置系统进行仿真分析,得到系统的固有特性,并对悬置优化设计,减小悬置支反力的幅值,从而提高发动机的隔振效率,降低整车的振动,解决怠速时的隔振问题。     

In situ body mount optimization: theory and experiment

In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle.     

汽车发动机悬置系统动刚度模态分析

建立了基于悬置元件怠速工况下动刚度的发动机悬置系统MATLAB力学模型.同时由LMS实验模态分析系统测得了发动机实际工况下的运行模态参数,并以模态置信度对其进行了验证.与静刚度模型相比,以悬置元件动刚度建立的模型,其动态参数与运行模态参数更为接近,表明动刚度模型能更好地模拟悬置系统实际工况下的动态特性.     

东风推进“大商用车”战略:东风商用车迎来新一轮大发展

同一天,2个新基地,一个正式投产,一个开工奠基。2011年9月29日,东风十堰新基地暨商用车动力总成新工厂奠基和东风商用车重卡新工厂投产仪式在湖北十堰举行。作为东风汽车公司面向"十二五"发展的重点能力建设项目,东风商用车重卡新工厂和动力总成     

Introducing a new semi-active engine mount using force controlled variable stiffness

This work introduces a new concept in designing semi-active engine mounts. Engine mounts are under continuous development to provide better and more cost-effective engine vibration control. Passive engine mounts do not provide satisfactory solution. Available semi-active and active mounts provide better solutions but they are more complex and expensive. The variable stiffness engine mount (VSEM) is a semi-active engine mount with a simple ON–OFF control strategy. However, unlike available semi-active engine mounts that work based on damping change, the VSEM works based on the static stiffness change by using a new fast response force controlled variable spring. The VSEM is an improved version of the vibration mount introduced by the authors in their previous work. The results showed significant performance improvements over a passive rubber mount. The VSEM also provides better vibration control than a hydromount at idle speed. Low hysteresis and the ability to be modelled by a linear model in low-frequency are the advantages of the VSEM over the vibration isolator introduced earlier and available hydromounts. These specifications facilitate the use of VSEM in the automotive industry, however, further evaluation and developments are needed for this purpose.     

基于虚拟样机技术的载货车动力总成悬置隔振性能的仿真

针对某重型载货车动力总成悬置系统的不同设计方案,利用ADAMS软件建立虚拟样机模型,通过实测其基本参数,对动力总成悬置系统的固有特性进行仿真计算,分析比较两种方案的悬置系统参数匹配的合理性,以达到提高悬置系统隔振性能的目的。     

Development of capacitor hybrid truck

Nissan Diesel Motor has developed a capacitor hybrid medium-duty truck. This vehicle involves a new power-train technology which makes for high efficiency and low emission with the basic technology being a high performance capacitor type storage device. The newly developed capacitor has an energy density that is twice as great as commercial ultracapacitors. The simple parallel hybrid system of this vehicle was composed of this capacitor, a single motor, a conventional diesel engine and a mechanical automatic transmission system. Fuel economy about 1.5 times greater than that of a conventional diesel truck is achieved. Furthermore, the TLEV level of exhaust emissions is also achieved.