共查询到19条相似文献,搜索用时 390 毫秒
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键合图理论在汽车振动分析中的应用 总被引:6,自引:0,他引:6
本文应用键合图理论建立了汽车5自由度振动系统的键图模型并推导出状态方程。编制了动态仿真程序,计算了国产某轻型越野车和某轻型货车驶过三角形单个凸起时的振动响应,分析了悬架参数对振动的影响,指出了提高该车平顺性的途径。进行了轻型货车实车试验并将试验结果与计算结果做了对照,证明所选模型和所编程序是正确的和实用的。 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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Hydraulically damped rubber mount (HDM) can effectively attenuate vibrations transmitted between an automotive powertrain
and body/chassis and reduce interior noise in the car compartment. Predicting the dynamic characteristics of a HDM faces challenges
due to fluid-structure interactions between the rubber spring and fluid in the chambers, nonlinear material properties of
the rubber parts and turbulent flow in the chambers and fluid track linking chambers. In this paper, an experimental analysis
and hydrostatic finite element (FE) modeling technique are integrated in a numerical simulation approach to modeling the dynamic
characteristics of a HDM with a lumped-parameter HDM model. The dynamic characteristics of a typical HDM with a fixed decoupler
are predicted and compared with experimental results, which verify the effectiveness of the proposed approach. Moreover, a
parametric effect analysis is performed to demonstrate parameter influence on dynamic characteristic, which provides a concise
design guideline for the parameter adjustments necessary for a HDM to meet the vibration isolation requirements of a powertrain
mount system. 相似文献
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分析动力总成惯性参数变化对系统振动特性的影响,进而确定参数测定或计算中的允许误差,对于悬置系统的成功设计具有重要意义。应用经典模态方法,推导了系统固有频率和主振动中最大振动能量对惯性参数灵敏度的计算式。结合具体实例,分析了动力总成质量、转动惯量以及惯性积对系统动态特性的影响,讨论了悬置系统设计中作为基本参数的惯性参数测定或计算结果可接受的误差容限。 相似文献
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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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Prediction of interior noise by excitation force of the powertrain based on hybrid transfer path analysis 总被引:1,自引:0,他引:1
In the early design stage of a vehicle, simulation of interior noise is useful for assessment and enhancement of the noise,
vibration and harshness (NVH) performance. Traditional transfer path analysis (TPA) technology cannot simulate interior noise
since it uses an experimental method. In order to solve this problem, hybrid TPA is employed in this paper. Hybrid TPA uses
simulated excitation force as the input force, which excites the flexible body of a car at the mount points, while traditional
TPA uses the measured force. This simulated force is obtained by numerical analysis of the finite element (FE) model of a
powertrain. Interior noise is predicted by multiplying the simulated force by the vibro-acoustic transfer function (VATF)
of the vehicle. The VATF is the acoustic response in the compartment of a car to the input force at the mount point of the
powertrain in the flexible car body. The trend of the predicted interior noise based on the hybrid TPA corresponds very well
to the measured interior noise, with some difference due to not only experimental error and simulation error, but also the
effect of the airborne path. 相似文献
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