汽车发动机橡胶悬置动特性仿真与试验研究

应用橡胶类材料的非线性本构理论和橡胶悬置产品的动刚度计算方法．以及有限元分析软件abaqus对国内某款橡胶悬置产品动刚度进行了分析。运用abaqus对该汽车悬置产品动刚度和阻尼进行了计算,且计算结果与实验结果相一致,说明其具有工程应用价值。     

汽车发动机橡胶悬置动特性仿真与试验研究

应用橡胶类材料的非线性本构理论和橡胶悬置产品的动刚度计算方法,以及有限元分析软件abaqus对国内某款橡胶悬置产品动刚度进行了分析。运用abaqus对该汽车悬置产品动刚度和阻尼进行了计算,且计算结果与实验结果相一致,说明其具有工程应用价值。     

汽车发动机橡胶悬置动特性仿真与试验研究

应用橡胶类材料的非线性本构理论和橡胶悬置产品的动刚度计算方法,以及有限元分析软件abaqus对国内某款橡胶悬置产品动刚度进行了分析。运用abaqus对该汽车悬置产品动刚度和阻尼进行了计算,且计算结果与实验结果相一致,说明其具有工程应用价值。     

有限元技术在橡胶悬置正向开发中的应用

通过与经验公式法对比,总结有限元技术辅助进行橡胶悬置正向开发的优势;以Abaqus有限元软件为基础,阐述如何应用有限元技术进行橡胶悬置正向开发流程;依据流程,介绍了两例橡胶悬置正向开发案例。结果表明,有限元技术辅助设计的橡胶悬置不仅达到了刚度目标要求,而且强度、寿命大幅提高,同时产品开发周期有效缩短。     

基于有限元方法的发动机悬置强度改进设计

为解决某车辆发动机悬置橡胶撕裂破坏问题,建立了该发动机悬置的有限元模型,计算所得悬置的垂向刚度与试验结果基本吻合,验证了该模型的有效性。静态模型和动态模型计算结果表明,橡胶垫内部应力集中出现在受力面转角处。对悬置模型进行结构改进,并对改进前、后的试件进行了刚度测量试验和疲劳寿命试验。结果表明,改进后发动机悬置垂向静刚度比原悬置降低了7.5%;静刚度变化率和压缩永久变形量分别为规定限值的32%和6%。     

高性能板式减震橡胶支座竖向刚度研究

为探究高性能板式减震橡胶支座竖向刚度的影响因素及规律,得到该支座竖向刚度的简化公式,对不同构造的高性能板式减震橡胶支座进行竖向刚度试验,并建立其实体有限元模型,对支座抗压弹性模量受2个形状系数的影响规律进行参数分析。然后,在现有纤维加劲橡胶支座的抗压弹性模量Tsai-Kelly理论公式与Toopchi-Nezhad修正方法的基础上,用得到的抗压弹性模量数值解对Toopchi-Nezhad修正抗压弹性模量公式中的变量系数进行拟合再修正,得到适用于高性能板式减震橡胶支座的抗压弹性模量理论公式。之后,结合新型支座的常用规格,利用支座抗压弹性模量与第一形状系数的线性拟合,得到其简化经验公式,用于高性能板式减震橡胶支座竖向刚度的计算。结果表明:高性能板式减震橡胶支座的抗压弹性模量会受橡胶层厚度、支座平面面积影响,并随支座第一形状系数S_1的增大而增大,随第二形状系数S_2的增大而减小;建立的新型支座有限元模型可以准确模拟其竖向受力性能;拟合得到的高性能板式减震橡胶支座抗压弹性模量理论公式与有限元模拟结果误差仅5%,可用于该支座竖向刚度的理论计算;经简化得到的经验公式可以用于钢丝直径为1mm,15S_145,2S_26的高性能板式减震橡胶支座的工程设计。     

发动机隔振系统振动固有特性的优化计算及影响因素分析

对发动机隔振系统振动固有特性进行了理论分析,引入了六自由度能量解耦理论,依托Matlab的矩阵运算能力,开发了发动机隔振系统优化设计软件,并利用该软件对系统进行了振动固有特性分析和能量解耦优化。考虑到悬置元件刚度的实际值与设计值可能存在一定偏差,因此针对某解耦度较高的系统,按照悬置元件各向刚度参数±20%的偏差范围,对系统进行仿真试验,研究了悬置元件刚度偏差对系统振动固有特性的影响,所得结论对隔振设计和悬置元件的工艺控制具有一定的指导意义。     

汽车摆臂衬套的静态特性

摆臂橡胶衬套是汽车悬架系统中重要的承载元件和隔振元件,其刚度特性直接影响悬架的弹性运动学,整车的操作稳定性和整车NVH特性。以某车型摆臂橡胶衬套为研究对象,通过对橡胶材料进行单轴拉伸试验,拟合出Mooney-rivlin模型的材料参数,利用非线性有限元软件ABAQUS建立摆臂橡胶衬套有限元模型,提取橡胶衬套轴向、径向和扭转刚度,并与试验的测试结果进行对比。结果表明,误差在允许范围内,验证有限元模型的准确性为橡胶衬套产品的设计与开发具有重要的指导作用。     

动力总成悬置系统防扭拉杆等效刚度的计算与应用

建立了防扭拉杆在动力总成悬置系统固有频率计算中的模型,推导了其等效刚度的计算公式.该防扭拉杆静刚度的公式计算值、有限元计算值和实测值的对比验证了所推导计算公式的正确性.以一具有防扭拉杆的汽车动力总成悬置系统为例,利用ADAMS软件和所计算出的防扭拉杆等效刚度对其固有频率进行了计算.计算结果和与试验结果的对比验证了本文防扭拉杆模型的正确性.     

基于流固耦合有限元法的汽车发动机液力悬置动力学分析

介绍了车载发动机液力悬置流固耦合的有限元分析法,模拟了液力悬置的动态响应。通过瞬态时域响应的模拟结果,计算了液力悬置的动态性能。在计算过程中使用ALE方法进行坐标变换,有效解决了流体力学和结构动力学在坐标系上的不一致问题。计算过程无须估算或测试液力悬置的流体阻尼,无须测量橡胶主簧的体积刚度,可以得到液力悬置在时域内的动态响应,仿真结果与试验测试结果吻合较好。     

橡胶隔振器有限元建模技术及静态弹性特性分析

以液阻型橡胶隔振器的橡胶主簧为研究对象，利用有限元分析软件ABAQUS和ADINA，建立了轴对称、1／4对称和完整的三维有限元模型；进行了橡胶隔振器有限元建模技术的数值试验分析；探讨了橡胶材料体积近似不可压缩特性的数值确定方法、杂交单元计算稳定性的数值判断方法、单元类型的选择（包括位移与压力节点的匹配方式及其插值函数阶次、单元积分形式等）、橡胶材料的超弹性本构关系的确定等；阐述了基于有限元方法的橡胶隔振器大变形静态弹性特性有限元分析方法。所预测的橡胶主簧的垂向静态弹性特性与实测结果吻合较好。     

Vibration Control of a Passenger Vehicle Utilizing a Semi-Active ER Engine Mount

This paper presents vibration control of a passenger vehicle using an electronically controllable electro-rheological (ER) engine mount. A mixed-mode ER engine mount operating under the flow and shear modes is devised and manufactured. After establishing the dynamic model of the proposed ER engine mount, both field-dependent displacement transmissibility and dynamic stiffness of the ER engine mount are empirically evaluated. The ER engine mount is then incorporated with a full-vehicle model in order to investigate vibration control performance at the driver's seat position. The governing equation of motion of the full-vehicle model is formulated by considering engine excitation force, followed by designing a skyhook controller to attenuate unwanted vibration. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at idle speed are evaluated in the frequency and time domains.     

Vibration Control of a Passenger Vehicle Utilizing a Semi-Active ER Engine Mount

This paper presents vibration control of a passenger vehicle using an electronically controllable electro-rheological (ER) engine mount. A mixed-mode ER engine mount operating under the flow and shear modes is devised and manufactured. After establishing the dynamic model of the proposed ER engine mount, both field-dependent displacement transmissibility and dynamic stiffness of the ER engine mount are empirically evaluated. The ER engine mount is then incorporated with a full-vehicle model in order to investigate vibration control performance at the driver's seat position. The governing equation of motion of the full-vehicle model is formulated by considering engine excitation force, followed by designing a skyhook controller to attenuate unwanted vibration. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at idle speed are evaluated in the frequency and time domains.     

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.     

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.     

Vibration transmission reduction from a centrifugal turbo blower in a fuel cell electric vehicle

This paper presents a multi-body flexible dynamic analysis of a centrifugal turbo blower for a fuel cell electric vehicle (FCEV) based on the application of computer-aided engineering (CAE) to predict the acceleration at the mount position of the blower. This predicted acceleration is validated by using the measured acceleration data. The numerical simulation for the multi-body flexible dynamics of the blower is used not only to identify the most effective mount among four mounts in an FCEV by controlling the complex stiffness of the isolator, but also to suggest the range of complex stiffness of the isolator at the most effective mount. This numerical simulation technology can be useful for the estimation of the variation of vibration transmission for the structural modification of the turbo blower.     

基于免疫进化算法的发动机悬置系统稳健优化

在分析各种优化方法优缺点的基础上,建立发动机悬置系统六自由度动力模型。以六自由度方向的解耦率为最大优化目标,以各悬置点三向刚度为设计变量,选用免疫进化算法对发动机的悬置刚度参数进行优化,最后用Monte Carlo法对悬置系统进行稳健性分析。结果表明,优化解不仅能保证六自由度方向的高解耦率,还能保证悬置系统的稳健性,提高了产品的质量。     

半主动控制惯性通道式液力悬置开发

介绍了一种惯性通道半主动控制式液力悬置的设计开发。该液力悬置不改变橡胶主簧刚度和液体黏度,随发动机转速变化,由步进电机控制旋转阀的旋转角度,改变惯性通道的工作段(各段具有不同的长度),从而改变液力悬置的动态特性,使发动机—悬置系统的振动传递率最小。装车试验表明,所设计悬置具有较好的宽频带减振隔振性能。     

动力总成运动分析在整车前舱集成中的应用

根据动力总成悬置系统的工作特性,在Adams/View中建立考虑悬置刚度非线性的仿真模型,根据极限工况要求对其进行加载,输出质心在稳态下的运动位移,编写动力总成运动文件,并根据此文件在Catia/DMU模块中生成运动包络体。通过整车试验结果表明,通过此方法得到的动力总成运动包络体可为整车前舱的集成工作提供指导依据。