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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):449-462
Engine mounts are used in the automotive industry to isolate engine and chassis by reducing the noise and vibration imposed from one to the other. This paper describes modelling, simulation and design of a semi-active engine mount that is designed specifically to address the complicated vibration pattern of variable displacement engines (VDE). The ideal isolation for VDE requires the stiffness to be switchable upon cylinder activation/deactivation operating modes. In order to have a modular design, the same hydraulic engine mount components are maintained and a novel auxiliary magneto-rheological (MR) fluid chamber is developed and retrofitted inside the pumping chamber. The new compliance chamber is a controllable pressure regulator, which can effectively alter the dynamic performance of the mount. Switching between different modes happens by turning the electrical current to the MR chamber magnetic coil on and off. A model has been developed for the passive hydraulic mount and then it is extended to include the MR auxiliary chamber as well. A proof-of-concept prototype of the design has been fabricated which validates the mathematical model. The results demonstrate unique capability of the developed semi-active mount to be used for VDE application. 相似文献
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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。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):761-787
In this paper, a computational model of conventional engine mounts for commercial vehicles comprising elastic, viscous and friction functional components, which expresses the nonlinear behaviour of the dynamic stiffness and damping of mounts as functions of both frequency and amplitude of excitation, is developed. Optimisation approach is implemented to identify model parameters using measurement data. The developed model has been validated against measurement data for harmonic excitations with a frequency range of 5–100 Hz and an amplitude range of 0.025–2 mm employing three different engine mounts used in heavy trucks. The model shows good and admissible agreement with measurement data keeping the tolerance of estimation below 11%. Simulations of engine vibration dynamics are presented with both proposed model and commonly applied Kelvin–Voigt model of the mounts. The developed model can be used in complete vehicle advanced dynamic analyses and also in the design of semi-active and active engine mounting systems for commercial vehicles. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):419-436
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. 相似文献
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汽车动力总成液力悬置——一种新型隔振元件的结构发展 总被引:5,自引:0,他引:5
动力总成液力悬置是国外70年代末在汽车上开始应用的新型隔振元件,是国际汽车隔振技术的重大突破,由于它具有优良的动特性,可明显降低汽车振动和车内噪声,因而它取代传统的橡胶悬置是未来发展的必然,本文回顾了液力悬置的发展历史,对其进行了分类,阐述了各种典型的液力悬置的结构工作原理和性能特点及其发展趋势。 相似文献
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Engine mounts are used for engine vibration isolation. The dynamic performance of the mount depends on the orientation. Measurements of the dynamic properties of engine mounts are usually performed in the axial direction because of the problem related to actuator loading direction and set up costs. Impact technique is developed here to measure the dynamic driving point stiffness and driving point shear stiffness of engine mount in a single setup. The compressive and shear frequency-dependent stiffnesses are obtained in the vertical orientation. A transformation matrix is used to calculate the frequency-dependent stiffnesses and loss factors in other orientations. Three different designs of engine mounts are used to verify the accuracy of the transformation model. The correlation coefficient between calculation and measurement results show R2≥ 0.995 along the X- and Y-axes. For the Z-axis, mounts B and C showed R2≥ 0.95 and mount A 0.687 ≤ R2≤ 0.791. 相似文献
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发动机振动传递系统建模及刚度参数影响分析 总被引:7,自引:0,他引:7
推导了某类轿车发动机悬置振动系统模型,分析了发动机对车身振动噪声的传递特性,说明该类轿车前梁和副车架是引起噪声放大的主要环节。根据移频减振降噪原理,借助实验优化设计,分析了振动传递系统的六个刚度对抑制振动噪声传递的主次关系。分析说明:降低发动机对轿车的振动噪声最有效的刚度修改措施是调整车前梁与车身联接点的刚度,比直接修改发动机三个悬置点刚度更有效。 相似文献
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汽车发动机液阻悬置动特性仿真与实验分析 总被引:23,自引:2,他引:23
本文总结了发动机悬置系统的隔振要求和常用的悬置元件动特性评价参数,指出了悬置元件为满足高、低频隔振要求而产生的设计上的矛盾和困难。通过激振实验方法测试了液阻悬置元件及其橡胶主簧的动刚度和阻尼特性。对一种轿车动力总成液阻悬置建立了集总参数的力学和数学模型,进行了动特性仿真,并与实验测试结果进行了对比分析,表明该模型对液阻悬置的低频动特性分析很有效,在高频段也可以预测液阻悬置开始发生动态硬化的频率,对于液阻悬置产品的设计和改进具有指导意义。 相似文献
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Genetic Algorithm (GA) and Singular Value Decomposition (SVD) are deployed for optimal design of both the Gaussian membership
functions of antecedents and the vector of linear coefficients of consequents, respectively, of ANFIS networks. These networks
are used for stiffness modelling and prediction of rubber engine mounts. The aim of such modelling is to show how the stiffness
of an engine mount changes with variations in geometric parameters. It is demonstrated that SVD can be optimally used to find
the vector of linear coefficients of conclusion parts using ANFIS (Adaptive Neuro-Fuzzy Inference Systems) models. In addition,
the Gaussian membership functions in premise parts can be determined using a GA. In this study, the stiffness training data
of 36 different bush type engine mounts were obtained using the finite element analysis (FEA). 相似文献
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汽车动力总成液阻型橡胶隔振器的研究发展 总被引:7,自引:0,他引:7
本文对被动式液阻型橡胶悬置及动力总成-液阻悬置系统的设计分析方法和研究成果进行了较系统的述评和总结。首先介绍了汽车动力总成液阻悬置的应用概况,总结,阐述了汽车动力总成悬置系统所要求的理想隔振特性,然后综述了节流孔型,惯性通道型,惯性通道-固定解耦膜型,惯性通道-活动解耦膜型等典型被动式液阻悬置元件的结构原理,集中参数模型,动态特性及其参数设计分析结果,同时综述了动力总成-液阻悬置系统隔振生能研究概况及设计分析方法,其中着重介绍了德国Freudenberg公司,美国Ohio州立大学,日本Nissan公司等主要研究者的研究工作及结果。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):257-278
Summary In this paper, the sensitivity analysis is applied to the development of high performance adaptive hydraulic mounts. The analysis allows us to select the most effective design parameters for tuning an adaptive mount to different road and engine conditions. It is shown that in the low frequency road excitation, the upper chamber compliance and inertia of the fluid column in the inertia track are the most influential properties in changing the dynamic stiffness of the hydraulic mount. These properties for the high frequency engine excitations are the upper compliance and the inertia of the fluid column of the decoupler. For tuning the adaptive mount to different road and engine excitation, a global optimization technique is used to find the magnitude of the adjusting parameters to minimize objective functions in low and high frequency excitations. The results indicate significant improvement over conventional hydraulic mounts. It is further shown that when the upper compliance is used as the adjusting parameter, a simple on-off control which is triggered by the engine revolution and vehicle speed is sufficient for tuning the adaptive mount. 相似文献