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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):193-216
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. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):721-736
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. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):341-360
Summary This paper presents an investigation of the feedback control performance of a full-vehicle suspension system featuring magnetorheological (MR) dampers. A cylindrical MR damper is designed and manufactured by incorporating a Bingham model of aMR fluid which is commercially available. After evaluating the field-dependent damping characteristics of the MR damper, a full-vehicle suspension system installed with 4 independent MR dampers is constructed and its governing equations of motion which include vertical, pitch and roll motions are derived. A H 8 controller which has inherent robustness against system uncertainties is formulated by treating the sprung mass of the vehicle as uncertain parameter. This is accomplished by adopting the loop shaping design procedure. For the demonstration of a practical feasibility, control performance characteristics for vibration suppression of the proposed MR suspension system are evaluated under various road conditions through the hardware-in-the-loop simulation (HILS) methodology. 相似文献
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Seung-Bok Choi Hwan-Soo Lee Young-Pil Park 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2002,38(5):341-360
Summary This paper presents an investigation of the feedback control performance of a full-vehicle suspension system featuring magnetorheological (MR) dampers. A cylindrical MR damper is designed and manufactured by incorporating a Bingham model of aMR fluid which is commercially available. After evaluating the field-dependent damping characteristics of the MR damper, a full-vehicle suspension system installed with 4 independent MR dampers is constructed and its governing equations of motion which include vertical, pitch and roll motions are derived. A H 8 controller which has inherent robustness against system uncertainties is formulated by treating the sprung mass of the vehicle as uncertain parameter. This is accomplished by adopting the loop shaping design procedure. For the demonstration of a practical feasibility, control performance characteristics for vibration suppression of the proposed MR suspension system are evaluated under various road conditions through the hardware-in-the-loop simulation (HILS) methodology. 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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惯性通道—解耦膜式液压悬置动特性分析 总被引:3,自引:1,他引:3
本文以Audi100轿车总成液压悬罩为例,建立了惯性通道-解耦膜式液压悬的非线;力的非线性力学模型和数学模型,对其原点动特性和跨点动特性进行仿真计算,经与试验结果相比较,二者吻合良好。 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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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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随着汽车动态仿真的发展。产生了不同复杂程度的动力学仿真模型。通过将汽车车身看作是一个刚体,忽略悬置的发动机和驾驶员以及座椅。建立了一个非线性七自由度的立体模型,在正弦路面激励下运用Matlab/simulink软件对汽车整车系统进行仿真计算。仿真结果表明,该模型可能存在混沌现象。 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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H. G. Zhang E. H. Wang B. Y. Fan M. G. Ouyang S. Z. Xia 《International Journal of Automotive Technology》2011,12(2):173-182
Variable Nozzle Turbocharger (VNT) was invented to solve the problem of matching an ordinary turbocharger with an engine.
VNT can harness exhaust energy more efficiently, enhance intake airflow response and reduce engine emissions, especially during
transient operating conditions. The difficulty of VNT control lies in how to regulate the position of the nozzle at different
engine working conditions. The control strategy designed in this study is a combination of a closed-loop feedback controller
and an open-loop feed-forward controller. The gain-scheduled proportional-integral-derivative (PID) controller was implemented
as the feedback controller to overcome the nonlinear characteristic. As it is difficult to tune the parameters of the gain-scheduled
PID controller on an engine test bench, system identification was used to identify the plant model properties at different
working points for a WP10 diesel engine on the test bench. The PID controller parameters were calculated based on the identified
first-order-plus-dead-time (FOPDT) plant model. The joint simulation of the controller and the plant model was performed in
Matlab/Simulink. The time-domain and frequency-domain performances of the entire system were evaluated. The designed VNT control
system was verified with engine tests. The results indicated that the real boosting pressure traced the target boosting pressure
well at different working conditions. 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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为了降低发动机工作时引起的整车振动,提出了使用多通道滤波x-LMS (MFXLMS) 算法作为主动悬置系统的控制算法。以发动机转速信号作为参考信号,主动悬置安装位置下方的两路加速度信号作为误差信号。根据算法完成试验平台搭建。采用白噪声电压信号作为输入激励,通过 LMS算法离线辨识得到主动悬置到加速度传感器的多路次级通道,在dSPACE上完成实车控制试验。试验结果表明,MFXLMS算法的运用显著降低了发动机不同转速工况下引起的测点加速度响应,提高了整车的乘坐舒适性。 相似文献
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