共查询到19条相似文献,搜索用时 591 毫秒
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在轮胎静生趣特怀建模的基础上,探讨了利用轮胎模态参数对轮胎纯侧偏特性的建模。通过侧向激振试验提取了轮胎的侧向模态参数并计算了轮胎在不同载荷下的偏离特性,计算结果与以往轮胎的试验结果具有很好的一致性。计算结果转化为无量纲形式并与经验模型进行了比较,建模和计算结果充分说明了模型的合理并显示了建模方法的优越性。 相似文献
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为了提高仿真模型的计算效率,基于环模型理论系统研究了轮胎二维有限元模型的建模技术、参数确定方法和轮胎包容特性分析技术.从试验与仿真结果对比分析可知,利用有限元方法基于轮胎REF模型建模,在对轮胎胎侧弹性进行非线性模型修正后,得到的轮胎低速滚动仿真结果与试验结果基本吻合,验证了轮胎模型的有效性,同时为车辆一地面系统虚拟试验提供了一种实时高精度的轮胎面内特性仿真建模方法. 相似文献
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轮胎滚动速度效应对轮胎侧偏动特性的影响 总被引:2,自引:0,他引:2
在利用试验模态参数建立轮胎侧偏非稳态模型基础上,本文重点分析了轮胎滚动速度效应对侧偏动特性的影响。解析模型计算结构的变化趋势和文献的试验研究结果一致。表明计入轮胎滚动所带来的速度对侧偏动特性的影响是不可忽略的,它会对不同速度下行驶汽车的操稳性及横向振动产生影响。滚动速度效应对轮胎侧偏特性影响的成功建械表明了利用模态参数对轮胎建模的优越性。 相似文献
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Magic Formula轮胎模型参数辨识的一种混合优化方法 总被引:1,自引:0,他引:1
Magic Formula(MF)轮胎模型能够准确描述轮胎的侧偏特性,广泛应用于车辆动力学的研究。由于MF轮胎模型参数多,且高度非线性,从大量的试验数据中准确辨识这些参数相当困难。提出一种基于遗传算法和数值优化算法的混合优化方法,采用由粗到精的辨识过程,先利用遗传算法得出近似最优解,再利用数值优化算法辨识出精确的参数。利用辨识出的参数计算轮胎的侧偏特性,计算结果与试验数据吻合良好,表明该方法是辨识MF轮胎模型参数的有效手段。 相似文献
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本文提出一种自适应轮膜模型参数的简易测定方法,给出轮胎垂直振动动力学方程及相应的求解方法,并进行计算分析与试验测定。将分析结果与通常的点接触式模型相比较,对点接触式模型及本文所建立的自适应模型做了综合评价,结果表明,本模型的计算结果是令人满意的。 相似文献
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考虑胎体复杂变形的轮胎非稳态转向特性半经验模型 总被引:3,自引:0,他引:3
本文在考虑胎体复杂变形的轮胎非稳态侧偏特性理论模型的基础上,提出了一种半经验模型。经过试验验证,在与汽车平面运动有关的低频范围内,其理论值与试验值吻合较好。与已有产半经验模型相比,该模型精度较高,可直接反映轮胎模型参数和结构参数间的关系,便于在车辆动力学仿真与轮胎特性改进中应用。 相似文献
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轮胎非稳态转向特性半经验模型 总被引:4,自引:2,他引:4
在轮胎非稳转向特性理论模型的基础,本文提出了一种半经验模型,经过试验验证,在与汽车平面运动有关的低频范围内,试验值与理论值吻合得较好,与已有的半经验模型相比,该模型具有计算简单,精度较高等优点,直接反映出轮胎模型参数与结构参数间的关系,便于在汽车动力学仿真与轮胎特性改进中应用。 相似文献
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This paper presents a novel nonlinear dynamic model of a multi-axle steering vehicle to estimate the lateral wear amount of tires. Firstly, a 3DOF nonlinear vehicle dynamic model is developed, including dynamic models of the hydropneumatic suspension, tire, steering system and toe angle. The tire lateral wear model is then built and integrated into the developed vehicle model. Based on the comparison of experimental and simulation results, the nonlinear model is proved to be better than a linear model for the tire wear calculation. In addition, the effects of different initial toe angles on tire wear are analyzed. As simulation results shown, the impact of the dynamic toe angle on the tire wear is significant. The tire wear amount will be much larger than that caused by normal wear if the initial toe angle increases to 1° - 1.5°. The results also suggest that the proposed nonlinear model is of great importance in the design and optimazation of vehicle parameters in order to reduce the tire wear. 相似文献
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A Motorcycle Multi-Body Model for Real Time Simulations Based on the Natural Coordinates Approach 总被引:3,自引:0,他引:3
Vittore Cossalter Roberto Lot 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2002,37(6):423-447
This paper presents an eleven degrees of freedom, non-linear, multi-body dynamics model of a motorcycle. Front and rear chassis, steering system, suspensions and tires are the main features of the model. An original tire model was developed, which takes into account the geometric shape of tires and the elastic deformation of tire carcasses. This model also describes the dynamic behavior of tires in a way similar to relaxation models. Equations of motion stem from the natural coordinates approach. First, each rigid body is described with a set of fully cartesian coordinates. Then, links between the bodies are obtained by means of algebraic equations. This makes it possible to obtain simple equations of motion, even though the coordinates are redundant. The model was implemented in a Fortran code, named FastBike . In order to test the code, both simulated and real slalom and lane change maneuvers were carried out. A very good agreement between the numerical simulations and experimental test was found. The comparison of FastBike 's performance with those of some commercial software shows that first is much faster than others. In particular, real time simulations can be carried out using FastBike and it can be employed on a motorcycle simulator. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(1-2):109-118
A newly developed tire model for the Overturning Moment (OTM) characteristics and the analysis of the influence of OTM on vehicle rollover behavior are presented. The new OTM model was developed based on the so-called Magic Formula tire model. The concept of the new model involves identifying the difference between the simple model and the measurements to the newly defined functions. It was seen that the new model agrees very well with the measured data over a wide range of tire vertical loads, slip angles and camber angles. The influence of tire OTM on the vehicle rollover behavior was also investigated by using a full vehicle simulation in which a rather large steering angle was input. The results obtained from the vehicle simulation with three different tire models (model without OTM, simple model and new model) were compared with the experimental results. It was found that the calculated result obtained with the new OTM model agreed best with the experiment. 相似文献
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Toshimichi Takahashi Masatoshi Hada Kozo Oyama Hideki Sakai 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2004,42(1):109-118
A newly developed tire model for the Overturning Moment (OTM) characteristics and the analysis of the influence of OTM on vehicle rollover behavior are presented. The new OTM model was developed based on the so-called Magic Formula tire model. The concept of the new model involves identifying the difference between the simple model and the measurements to the newly defined functions. It was seen that the new model agrees very well with the measured data over a wide range of tire vertical loads, slip angles and camber angles. The influence of tire OTM on the vehicle rollover behavior was also investigated by using a full vehicle simulation in which a rather large steering angle was input. The results obtained from the vehicle simulation with three different tire models (model without OTM, simple model and new model) were compared with the experimental results. It was found that the calculated result obtained with the new OTM model agreed best with the experiment. 相似文献
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Establishment of Model for Tire Steady State Cornering Properties using Experimental Modal Parameters 总被引:2,自引:0,他引:2
Guan Dihua Shang Jin L. H. Yam 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2000,34(1):43-56
Modeling of tire cornering properties using experimental modal parameters is studied. With tire lateral experimental modal parameters, the distribution of side force and lateral deformation under total adhesive and sliding conditions are obtained. Side force, self-aligning, cornering stiffness and relaxation length under different loads and friction coefficients are also calculated. The calculated results are in correspondence to experimental results in the references qualitatively. The non-dimensional side force obtained from the calculated results is compared with the Fiala model, its modified expression by experiments and also the widely used empirical Magic Formula model. The calculated results tally well with the fitted results obtained using Magic Formula model. It can be seen that the tire steady state cornering model using experimental modal parameters proposed in this paper is better for an in-depth study of tire natural characteristics, and the labored experimental work can be avoided. 相似文献
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Wei Liang Jure Medanic Roland Ruhl 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2008,46(3):197-227
Modeling of tire friction is one of the central problems for vehicle control systems design. LuGre-type dynamic tire model has been proposed and well discussed in previous studies, because it offers a compact form of dynamic model that is convenient in advanced control studies. It has been successfully used in tire slip control design and vehicle state estimation problems. In this article, a concept of time-constrained Stribeck effect is introduced to interpret the mechanism of the LuGre friction model in predicting tire friction characteristics. A modified two-dimensional (2D) dynamic LuGre friction model is introduced to make it compatible with the governing theorem in the steady state. An analytical 2D modified LuGre-type dynamic tire model is developed, in which some fundamental limitations of classical LuGre models are eliminated. The main modifications involve a change in the structure of the 2D LuGre friction model, introduction of load-dependent parameters in 1D and 2D tire models, and a changed structure in the distributed parameter model. The proposed model is compared, in the steady state, to both the Magic Formula and the classical LuGre model. It improves model accuracy in the steady state and gives a physically reasonable distribution of the bristle deflection. A first-order lumped parameter (LP) nonlinear model, which has simpler structure than the distributed parameter model and the classical LP LuGre model, is then derived. Numerical simulations show that the proposed LP model has a good estimation for tire transient dynamics. Thus, the proposed model retains the merits of LuGre-type models and improves the agreement with observation and experimental data on friction force distribution along the patch and on the steady-state friction prediction. 相似文献
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Modeling of tire cornering properties using experimental modal parameters is studied. With tire lateral experimental modal parameters, the distribution of side force and lateral deformation under total adhesive and sliding conditions are obtained. Side force, self-aligning, cornering stiffness and relaxation length under different loads and friction coefficients are also calculated. The calculated results are in correspondence to experimental results in the references qualitatively. The non-dimensional side force obtained from the calculated results is compared with the Fiala model, its modified expression by experiments and also the widely used empirical Magic Formula model. The calculated results tally well with the fitted results obtained using Magic Formula model. It can be seen that the tire steady state cornering model using experimental modal parameters proposed in this paper is better for an in-depth study of tire natural characteristics, and the labored experimental work can be avoided. 相似文献
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J. Kim 《International Journal of Automotive Technology》2008,9(6):687-693
In this article, the analysis methods for vehicle handling performance are studied. Using simple models, dynamic characteristic
parameters such as yaw, natural frequency, and the damping coefficient of a vehicle can be theoretically formulated. Here,
the vehicle is simplified by a bicycle (single-track) model, and the tire is modeled by an equivalent cornering stiffness
and first order lag. From the experimental road data, the tire model parameters (equivalent cornering stiffness and time lag
constant) are extracted. These parameters are then inserted into the theoretically formulated equations of dynamic characteristic
parameters. For the purpose of validating the efficiency of the suggested methods, experimental road tests (where the cars
have different handling performances) are performed. The results show that vehicle handling performance can be sufficiently
represented by the suggested dynamic characteristic parameters. So, it is concluded that the proposed method has practical
use for the development of new cars or for the comparison of similar cars since the evaluations of the vehicle handling performance
can be efficiently determined by the suggested dynamic characteristic parameters. 相似文献