共查询到20条相似文献,搜索用时 15 毫秒
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汽车液压阻尼器的四段线性化模型 总被引:5,自引:0,他引:5
通过对现有某车用液压阻尼器的实验研究和车辆悬架系统动力学仿真研究,发现这种阻尼器的动力学特性存在复杂的非线性行为。为准确描述这类阻尼器的动力学特性和进行汽车悬架系统的动力学仿真研究,本文根据阻尼器的实验数据,提出一种新型四段线性化阻尼器模型,并建立其相应的数学模型。通过汽车悬架系统的动力学仿真研究表明,采用四段线性化阻尼器模型,汽车悬架系统簧载质量在不同路面不平度函数作用下的加速度响应和均方根加速度响应随频率变化不会出现大的波动。与等效线性化阻尼器模型相比,四段线性化阻尼器模型,能较好降低汽车悬架系统簧载质量的加速度响应和均方根加速度响应,有利于提高汽车乘坐舒适性和行驶稳定性,并为新型阻尼器设计提供一个新的思路。 相似文献
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基于最小概率DWO的激光陀螺温度误差模型辨识 总被引:1,自引:1,他引:0
鉴于激光陀螺温度误差模型的非线性和时变性,从提高模型辨识质量的需要出发,运用基于最小概率DWO(直接加权优化)的非线性系统辨识方法进行激光陀螺温度误差模型辨识研究,提出了一种精度更高的激光陀螺温度误差模型。该模型以带宽作为唯一需要确定的模型参数,避免了以往温度误差模型研究中的结构与参数辨识等复杂问题,从而在保证模型辨识质量的基础上,也相应提高了模型的适应能力,并通过两种温度误差特性有显著区别的激光陀螺(四频差动激光陀螺和二频机抖激光陀螺)的温度实验数据验证了该模型的正确性和适应性。 相似文献
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基于最优加权组合模型及高斯-牛顿法的滑坡变形预测研究 总被引:2,自引:0,他引:2
在对最优加权组合理论和高斯-牛顿法优化非线性模型参数的方法研究的基础上,依托于洒勒山滑坡的实际变形监测资料,建立了该滑坡变形预测的3个非线性预测模型:指数模型、Verhulst模型和灰色GM(1,1)模型;利用最优加权组合理论建立了洒勒山滑坡的最优加权组合预测模型,并运用高斯-牛顿法对各单一模型和组合模型的参数进行了优化。通过对比分析得出:组合模型的预测精度高于任何单一模型的预测精度;参数优化后各单一模型的预测精度都有不同程度的提高;参数优化后的组合模型预测精度是最高的。因此,综合运用最优组合理论和高斯-牛顿法处理滑坡预测预报模型,是提高滑坡预测预报精度的行之有效的方法。 相似文献
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非完整系统动力学中的Vakonomic模型和Четаев模型 总被引:4,自引:1,他引:3
综述了非完整系统动力学中Чeтaeв模型和Vakonomic模型.论证了Hertz,Capon和Lindelof的工作与Vakonomic模型相吻合,而Holder,Pars和Чаплыгин的工作与Четаев模型相吻合;Vakonomic模型和четаев模型两类模型并存的局面可以追溯到非完整力学发展的初期.说明了伴随两类模型并存的现象而出现的两个问题:d-δ交换性问题和∫-δ交换性问题.综述了我国学者为统一两类模型作出的贡献.最后,展望了该领域的研究方向. 相似文献
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A new subgrid-scale (SGS) model for the thermal field is proposed. The model is an extended version of the mixed-timescale (MTS) SGS model for velocity field by Inagaki et al. (2005), which has been confirmed to be a refined SGS model for velocity field suited to engineering-relevant practical large eddy simulation (LES). In the proposed model for the thermal field, a hybrid timescale between the timescales of the velocity and thermal fields is introduced in a manner similar to velocity-field modeling. Thus, the present model dispenses with an ambiguous SGS turbulent Prandtl number, like the dynamic SGS model. In addition, the wall-limiting behavior of turbulence is satisfied, which is not in the original MTS model, by incorporating the wall-damping function for LES based on the Kolmogorov velocity scale proposed by Inagaki et al. (2010). The model performance is tested in plane channel flows at various Prandtl numbers, and the results show that this model gives the ratio of the timescales between the velocity and thermal fields similar to that obtained using the dynamic Smagorinsky model with locally calculated model parameters. It is also shown that the proposed model predicts better mean and fluctuating temperature profiles in cooperation with the revised MTS model for the velocity field, than the Smagorinsky model and the dynamic Smagorinsky model. The present model is constructed with fixed model parameters, so that it does not suffer from computational instability with the dynamic model. Thus, it is expected to be a refined and versatile SGS model suited for practical LES of the thermal field. 相似文献
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Gravitational forces in dual-porosity systems: II. Computational validation of the homogenized model
Todd Arbogast 《Transport in Porous Media》1993,13(2):205-220
Three models are considered for single component, single phase flow in naturally fractured porous media. The microscopic model holds on the Darcy scale, and it is considered to govern the system. The macroscopic, dual-porosity model was derived in Part I of this work from the microscopic model by two-scale mathematical homogenization. In this paper, we show that the dual-porosity model predicts well the behavior of the microscopic model by comparing their computed solutions in certain reasonable test cases. Homogenization gives a complex formula for a key parameter in the dual-porosity model; herein a simple approximation to this formula is presented. The third model considered is a single-porosity model with averaged parameters. It is shown that this type of model cannot predict the behavior of the microscopic flow.This work was supported in part by the National Science Foundation and by the State of Texas Governor's Energy Office. 相似文献
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提出了晶体学模型来研究多层薄膜滚压的表面粗糙度。研究了单层滚压模型,提出滚压的三维模型和二维模型(平面应变),讨论了晶粒大小和应力状态的影响。把单个单层滚压和多层滚压模型、三维模型和平面应变模型进行了比较,发现对于所涉及的二维和三维模型来说,单层滚压和多层滚压模型并无明显的差别。因此在这些情况下,可以用单个单层滚压模型来代替多层滚压模型从而节省CPU时间。 相似文献
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Despite being one of the oldest and most widely-used turbulence models in engineering computational fluid dynamics (CFD), the k-ω model has not been fully understood theoretically because of its high nonlinearity and complex model parameter setting. Here, a multi-layer analytic expression is postulated for two lengths (stress and kinetic energy lengths), yielding an analytic solution for the k-ω model equations in pipe flow. Approximate local balance equations are analyzed to determine the key parameters in the solution, which are shown to be rather close to the empirically-measured values from the numerical solution of the Wilcox k-ω model, and hence the analytic construction is fully validated. The results provide clear evidence that the k-ω model sets in it a multilayer structure, which is similar to but different, in some insignificant details, from the Navier-Stokes (N-S) turbulence. This finding explains why the k-ω model is so popular, especially in computing the near-wall flow. Finally, the analysis is extended to a newly-refined k-ω model called the structural ensemble dynamics (SED) k-ω model, showing that the SED k-ω model has improved the multi-layer structure in the outer flow but preserved the setting of the k-ω model in the inner region. 相似文献
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This paper describes a newly developed non-isotropic multiple-scale turbulence model(MS/ASM)for complex flow calculations.This model focuses on the direct modeling of Reynolds stresses and utilizes split-spectrum concepts to model multiple-scale effects in turbulence.Validation studies on free shear flows,rotating flows and recirculating flows show that the current model performs significantly better than the single-scale k-εmodel.The present model is relatively inexpensive in terms of CPU time which makes in suitable for broad engineering flow applications. 相似文献
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Integrated flow modeling is the combination of a traditional flow simulator with a petrophysical model. By combining a petrophysical model with a traditional flow model, it is possible to perform calculations that improve our ability to monitor fluid movement in porous media. This paper outlines the formulation of an integrated flow model IFLO and its multi-variable, Newton–Raphson IMPES solution procedure. The benefits of integrated flow modeling and the underlying principles involved in the integration of a flow model with a petrophysical model are presented. Results from the IFLO model are used to illustrate the principles. 相似文献
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Toshiki Kihara 《Experimental Mechanics》2004,44(5):455-460
The method of measurement of a three-dimensional photoelastic model with rotated principal axes has not yet been fully experimentally
established. It is known that a three-dimensional photoelastic model can be reduced to an optically equivalent model. In this
paper, the optically equivalent model is realized from a stratified model consisting of two layers of the frozen stress model.
The secondary principal stress direction and the relative phase retardation of the frozen disk model in the stratified frozen
stress model are determined for the entire field from Stokes parameters obtained by scattered-light photoelasticity using
unpolarized light. The accuracy of these values is confirmed by a comparison with results only from the frozen stress disk
model. 相似文献
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基于Evans-Johnson模型提出了润滑油五参数流变模型,利用Evans-Johnson流变模型和五参数流变模型对润滑油的拖动系数进行计算,并与试验数据进行对比.结果表明,利用五参数流变模型预测的拖动曲线与试验曲线形状一致,预测精度较高.在热效应不显著的情况下,采用Evans-Johnson流变模型和五参数流变模型预测的拖动系数基本重合,与试验值接近;在热效应比较显著的区域,利用五参数模型预测的油膜温度值高于Evans-Johnson模型的预测值,对拖动系数的预测精度远大于Evans-Johnson模型的预测精度,解决了在热效应较显著的情况下流变模型对拖动力预测精度较低的难题. 相似文献
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优化方法用于模型校核 总被引:2,自引:0,他引:2
在工程实际中,常常会遇到需要选择本构模型和校准参数的模型校核问题。文中采用优化方法实现了复杂模型校核的自动化。文中,首先将各种本构模型映射为整数编号,并根据这些编号来激活相应的本构模型和本构模型参数,解决了本构模型的参数化问题;另外,根据模型校核问题的特点选择了试验结果和计算结果相对误差的平方和作为目标函数。通过这些步骤,用实现了优化方法模型校核自动化。 相似文献
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计算弹性地基梁板时,大都采用文克尔地基模型。由于该模型过于简化,不能正确反映土的工程性质,为此本文提出了一种双参数层状地基模型。该模型由一系列的弹性层组成,并对每一层中应力应变分布做了假设。通过积分变换的方法可以求出每一层表面处位移与力之间的关系,进而形成层刚度矩阵。按照有限元法的原理,可把每一层的刚度矩阵凝聚成总体刚度矩阵进行求解。本文模型是V1azov模型的延伸和发展。通过与V1azov模型计算结果的比较,证明本文方法是正确的。并且本文得到了荷载作用于层状模型内部时的解答,为将双参数地基模型用于桩基分析打下了理论基础。 相似文献
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回采工作面周期来压步距的灰色预测 总被引:1,自引:0,他引:1
利用灰色系统理论, 将回采工作面周期来压视为灾变, 仿线性GM(1, 1)预测模型建模机理, 本文建立了包括线性模型在内的统一非线性GM(1, 1)预报模型。利用非线性模型特例Verhulst模型和线性模型分别对两个不同矿山条件老顶周期来压步距进行预测, 结果表明, 不同的地质条件将适合不同的预测模型, 不能简单一概用线性模型进行预测。对于地质条件发生灾变的情形可建立激励预测模型对周期来压步距进行预测。 相似文献