共查询到18条相似文献,搜索用时 109 毫秒
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建立半主动控制液压悬置的力学模型,推导出动刚度、动阻尼和传递率的数学模型,研究惯性通道内阻尼力的表达式,并依次改变悬置的这些主要结构参数,对悬置动特性进行仿真,观察各参数改变对悬置动特性的影响,以便得到较好的隔振效果。 相似文献
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研究了具有可变刚度阻尼的发动机空气弹簧液压悬置的动特性和隔振特性。针对影响发动机空气弹簧液压悬置动特性的关键参数上液室等效体积刚度,采用理论和试验方法研究了上液室等效体积刚度的等效值,基于该等效值建立了空气弹簧液压悬置的理论模型,对空气腔开闭两种工况进行了空气弹簧液压悬置动特性的仿真和试验研究。搭建了发动机空气弹簧液压悬置系统试验台架,研究了台架各种激励频率下的空气弹簧液压悬置的隔振特性。结果表明:本研究采用的上液室等效体积刚度进行空气弹簧进行建模是正确、可行的,提高了空气弹簧建模效率和准确性;空气弹簧液压悬置在空气腔开启和关闭两种状态下,峰值动刚度增大幅值达78.5%,峰值阻尼角增大幅值达250%。台架试验表明:当台架激励频率小于25Hz时,悬置采用大刚度大阻尼;当台架激励频率大于等于25 Hz时,悬置采用小刚度小阻尼;悬置隔振率提升明显,不同频率下提升幅值达10%~67%。 相似文献
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首先建立了惯性通道-解耦模式液压悬置隔振系统的非线性力学模型和数学模型,然后以Audi100轿车动力总成液压悬置为例,对其正向隔振性能进行了仿真计算和实验研究,理论计算结果与实验结果在0-300Hz频段吻合良好。深入分析了液压悬置的各参数对其低、高频隔振性能的影响规律,较详细地阐述了惯性通道-解耦膜式液压悬置的参数选择及匹配方法,从而为经类压悬置了提供了更充分的理论依据。 相似文献
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橡胶主簧作为液压悬置的主要承力部件,其刚度特性直接影响液压悬置的性能.分析了橡胶类材料的本构模型,通过实验方法测得橡胶材料的本构模型参数,建立了橡胶主簧的有限元数值分析模型.数值计算结果与实验数据相吻合,说明该模型是有效实用的. 相似文献
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理想的发动机悬架系统应隔离发动机工作转速范围内由发动机干扰力所引起的发动机振动,并阻止由冲击而激起的发动机弹跳,这意味着发动机悬架的动态刚度和阻尼是与频率和振幅有关的,改善依赖于频率和振幅特性的动态刚度与阻尼是发动机悬架系统发展的关键所在。传统的弹性悬架不能满足所有的要求,它仅能在静偏转和隔振之间进行折衷,特别在低频域,被动的液压悬架能比弹性悬架提供更好的特性,通常半主动技术,由于其可调性而被用来进一步改善液压悬架的特性,为了隔振、低频时主动发动机悬架系统非常硬,而在高频域内被调整的非常软,主动的发动机悬架已被认为是发动机悬架的新一代,发动机悬架系统的优化是相当可取的,但发动机悬架的优化工作出现一些局限性,文中综述国内,外发动机悬架技术的现状与进展。 相似文献
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Achieving very restricted noise, vibration and harshness targets in modern vehicles, makes using the hydraulic engine mount crucial. Hydraulic engine mounts have both solid and fluid media in their structures that make their dynamic behavior complex to figure out. We present a three-dimensional model of HEM with using finite element method that encompasses elastomeric material’s nonlinearity and fluid-structure-interaction. Dynamic equivalent modulus of elasticity for elastomeric material is identified through iterative model updating procedure. To do model updating, the results (here, namely, natural frequencies and frequency response function graphs) are compared with real hydraulic engine mount behavior that derived from modal tests. The results showed that the dynamic characteristic of elastomeric material is frequency dependent and can be divided into two distinct regions: below 30 Hz (low frequency) and above 30 Hz (high frequency) with different trends. 相似文献
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Optimal design of nonlinear hydraulic engine mount 总被引:1,自引:0,他引:1
Young Kong Ahn Jin Dae Song Bo-Suk Yang Kyoung Kwan Ahn Shin Morishita 《Journal of Mechanical Science and Technology》2005,19(3):768-777
This paper shows that the performance of a nonlinear fluid engine mount can be improved by an optimal design process The property
of a hydraulic mount with inertia track and decouplen differs according to the disturbance frequency range. Since the excitation
amplitude is large at low excitation frequency range and is small at high excitation frequency range, mathematical model of
the mount can be divided into two linear models One is a low frequency model and the other is a high frequency model The combination
of the two models is very useful in the analysis of the mount and is used for the first time in the optimization of an engine
mount in this paper Normally, the design of a fluid mount is based on a trial and error approach in industry because there
are many design parameters In this study, a nonlinear mount was optimized to minimize the transmissibilities of the mount
at the notch and the resonance frequencies for low and high-frequency models by a popular optimization technique of sequential
quadratic programming (SQP) supported by MATLAB(r) subroutine. The results show that the performance of the mount can be greatly improved for the low and high frequencies ranges
by the optimization method 相似文献
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液压系统长大管路的清洗 总被引:1,自引:0,他引:1
针对液压系统在施工及维护过程中易造成潜在污染的情况,简述了液压管路清洗的基本步骤,以发动机生产线液压管路为例,对复杂长大液压管路的清洗方法进行了探索,为长大复杂液压系统的设计及管道清洗提供了参考。 相似文献