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发动机液压悬置作为汽车重要的隔振元件,主要由橡胶和液压模块两部分组成。橡胶部分可以有效衰减发动机的振动,液压模块可以通过内部流道共振产生较大的阻尼,从而有效地抑制来自路面的冲击。文章对发动机液压悬置的物理结构和材料特性进行分析,采用Coulumb摩擦模型以及Kelvin-Voigt模型表征橡胶材料的内部摩擦以及黏弹性特性。在考虑流道结构和油液特性的基础上建立液压模块的物理模型,通过仿真得到了液压悬置的动刚度和滞后角。最后,通过试验验证了文章的建模方法,并研究了关键物理参数对液压悬置动刚度和滞后角的影响。 相似文献
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《中国公路学报》2017,(2)
为降低液压挖掘机的能量消耗,提出一种基于液压蓄能器和平衡油缸的动臂势能回收系统。以节能性为优化目标,以满足系统工作特性,减小蓄能器安装体积和延长蓄能器使用寿命为约束条件,对平衡系统的关键元件——液压蓄能器的工作压力、额定体积和充气压力等参数进行优化设计,分析不同的蓄能器体积和工作压力对系统节能效率的影响,确定最优的液压蓄能器参数;利用AMESim建立有无平衡单元的2种系统仿真模型,以3个比例节流阀和1个比例溢流阀代替传统多路阀对动臂的工作过程进行控制,并据此搭建了某1.5t液压挖掘机动臂势能回收系统试验平台。研究结果表明:仿真结果与试验结果吻合,系统的参数选择合理,仿真模型较准确;在所选取的液压蓄能器参数满足动臂操控性能和系统工作特性的前提下,动臂上升阶段,有平衡系统的无杆腔压力比无平衡系统的降低约2.5MPa,液压泵的出口压力降低约1MPa;动臂上升和下降工作周期内,势能回收和释放的整个工作周期的效率约为29%。 相似文献
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AMEsim软件及其应用 总被引:6,自引:4,他引:6
介绍了IMAGINE公司开发的AMEsim流体仿真软件的功能、特点及使用方法,并以液压回路的动特性仿真为例介绍了AMEsim在液压领域的使用前景. 相似文献
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江阴大桥动静载试验与分析 总被引:13,自引:0,他引:13
江阴大桥主桥为跨径1385m的钢悬索桥,一跨过江,是我国第一座跨径超千米的钢箱梁悬索桥,动静载试验包括:桥梁结构在活载作用下工作状态与工作性能,即结构静力和动力的响应情况,动静载试验结果与理论计算结果的分析对比表明:江阴大桥刚度和强度达到设计要求。 相似文献
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挖掘机采用泵阀复合进出口独立控制液压系统较传统抗流量饱和的负载敏感系统(LUDV)可显著降低阀口工作压差,提高能量利用效率,同时降低柴油机转速及其扭矩输出,改善柴油机的燃油经济性,但在动臂下降、回转制动工况时液压系统功率输出较小,柴油机工作于低负荷工况,尚有较大节油空间。为优化柴油机工作区域,进一步提高泵阀复合进出口独立控制挖掘机的整机经济性,提出基于柴油机万有特性分析的柴油机-液压泵功率匹配方案。通过对比泵阀复合进出口独立控制系统与LUDV系统的动臂工作特性和回转特性,明确动臂单动作、回转单动作时的功率范围,并依据柴油机万有特性曲线,分析2个系统在相应工况时柴油机的工作区域,指出对于泵阀复合进出口独立控制系统,当动臂下降、回转制动时,柴油机输出功率远小于1 800 r·min-1所对应的额定功率。为改善此工况时柴油机的经济性,基于柴油机三缸工作模式和柴油机两缸工作模的万有特性曲线,确定功率匹配的控制策略,当挖掘机动臂举升时,柴油机全部气缸工作,动臂下降时,柴油机采用两缸工作模式;当以最大半径回转启动时,柴油机全部气缸工作;以最小半径回转启动时,柴油机采用三缸工作模式;回转制动阶段,柴油机工作于两缸模式。建立整机动力系统试验平台,进行动力性和经济性比较试验。试验结果表明:在满足的动力性的前提下,采用柴油机多个气缸停缸技术,动臂单动作举升过程中降低燃油消耗20%,在最大半径回转过程中,可降低燃油消耗40%,在最小半径回转过程中,燃油消耗降低20%,节能效果明显。 相似文献
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液压主动悬架的非线性自适应控制 总被引:2,自引:0,他引:2
以车身垂直加速度和悬架动行程为控制目标,同时引入非线性高通滤波器和非线性低通滤波器,基于逆向递推(Backstepping)技术,并考虑液压系统的非线性特性及其参数不确定性,提出了一种主动悬架的非线性自适应控制方法。仿真结果表明,在不同的激励信号作用下,都取得了较好的控制效果。 相似文献
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本文建立了带惯性通道的解耦盘-膜式液力悬置动特性的力学模型和数学模型,对其动特性的表征参数如动刚度,滞后角和力传递率等进行了仿真计算,与试验相比,二者吻合良好。此外还分析了模型参数对动特性的影响。本文为此类液力悬置动特性的设计计算提供了理论依据。 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
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M. S. Foumani A. Khajepour M. Durali 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2003,39(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
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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(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