共查询到20条相似文献,搜索用时 501 毫秒
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客车因载质量大和质心高的特点难以兼顾操纵稳定性和平顺性,为此本文提出了一种侧倾构型的液压互联悬架(RHIS)与电控空气悬架(ECAS)相结合的新型悬架系统。首先,基于热力学理论建立了空气弹簧非线性模型并试验验证;基于质心定理、动量矩定理推导了整车9自由度动力学模型,建立了整车和RHIS的机械-液压耦合模型,并通过实车测试验证了模型;然后,设计了气囊模糊控制器以实现车身高度调节;最后,在常用的操纵稳定性和平顺性测试工况下仿真对比了新型和传统悬架系统的性能。结果表明,所提出的新型悬架系统可实现3挡车身高度调节,且在保持原车平顺性的同时明显改善了整车的操纵稳定性。 相似文献
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采用基于Routh稳定判据的Pade逼近法对被动天棚阻尼悬架系统进行降阶,寻找阶次低、元件少的ISD悬架结构。建立四分之一悬架模型,运用统一目标函数的遗传算法优化结构的参数,对比分析了传统被动、被动天棚阻尼和降阶ISD三种悬架系统的性能。结果表明,与被动天棚阻尼悬架相比,降阶ISD悬架的车身加速度、轮胎动载荷和悬架动行程均方根值都不同程度逼近被动天棚阻尼悬架,能够实现被动天棚阻尼悬架的主要性能,说明经降阶优化的ISD悬架综合性能可以接近被动天棚阻尼悬架,研究结果从理论上验证了基于Routh稳定判据的Pade逼近法的有效性。 相似文献
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在MSC.ADAMS/View中建立了双桥、单轨的整车多刚体动力学模型,模拟车辆的真实行驶工况,根据整车不同的状态运用MATLAB计算施加于车轮的液压力,通过普通悬架与主动悬架的仿真分析结果对比,从理论上验证了装备液压装置的主动悬架在操纵稳定性和行驶平顺性方面优于普通悬架。 相似文献
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X. Q. Sun L. Chen S. H. Wang X. L. Zhang X. F. Yang 《International Journal of Automotive Technology》2016,17(3):399-408
This paper investigates the influence of ball-screw inerter nonlinearities on the vibration isolation performance of the vehicle suspension system. That is achieved by building a nonlinear mechanics model of the ball-screw inerter with friction in ball-screw assembly and elastic effect of screw. The parameters of the nonlinear mechanics model are identified using recursive least squares algorithm based on test data. Then, the nonlinear ball-screw inerter is applied to vehicle suspension analysis of the half-car model with three passive suspension layouts. The performance of the vehicle suspension system with the nonlinear ball-screw inerter is compared with that with the linear inerter. It is demonstrated from the results that the vibration isolation performance of the vehicle suspension system is slightly influenced by considering the ball-screw inerter nonlinearities in general. The influence of the ball-screw inerter nonlinearities on every performance indicator for different suspension layouts is discussed finally. 相似文献
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非线性液压阻尼悬架的优化设计及最优控制 总被引:7,自引:1,他引:7
本文对二自由度非线液压阻尼悬架系统进行了统计线性分析,并提出这种半主动非线性液压阻尼悬架系统针对不同路况进行最优控制的控制策略;同时对非线性阻尼系统进行实时仿真,得出此类液压阻尼对振动的抑制优于线性阻尼的结论。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1895-1911
To improve the shift quality of the vehicle with clutch-to-clutch gear shifts, a nonlinear feedforward–feedback control scheme is proposed for clutch slip control during the shift inertia phase. The feedforward control is designed based on flatness in consideration of the system nonlinearities, and the linear feedback control is given to accommodate the model errors and the disturbances. Lookup tables, which are widely used to represent complex nonlinear characteristics of powertrain systems, appear in their original form in the designed feedforward controller, while the linear feedback controller is calculated through linear matrix inequalities such that the control system is robust against the parameter uncertainties. Finally, the designed controller is tested on an AMESim powertrain simulation model, which contains a time-variant model of clutch actuators. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):463-480
The linear quarter car model is the most widely used suspension system model. A number of authors expressed doubts about the accuracy of the linear quarter car model in predicting the movement of a complex nonlinear suspension system. In this investigation, a quarter car rig, designed to mimic the popular MacPherson strut suspension system, is subject to narrowband excitation at a range of frequencies using a motor driven cam. Linear and nonlinear quarter car simulations of the rig are developed. Both isolated and operational testing techniques are used to characterise the individual suspension system components. Simulations carried out using the linear and nonlinear models are compared to measured data from the suspension test rig at selected excitation frequencies. Results show that the linear quarter car model provides a reasonable approximation of unsprung mass acceleration but significantly overpredicts sprung mass acceleration magnitude. The nonlinear simulation, featuring a trilinear shock absorber model and nonlinear tyre, produces results which are significantly more accurate than linear simulation results. The effect of tyre damping on the nonlinear model is also investigated for narrowband excitation. It is found to reduce the magnitude of unsprung mass acceleration peaks and contribute to an overall improvement in simulation accuracy. 相似文献
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针对变刚度半主动悬架这种时变的、非线性复杂系统,提出将神经网络自适应控制策略用于该悬架的控制,研究中主要用车身垂直加速度作为主要控制目标,以提高车辆行驶的平顺性,同时在仿真控制研究中兼顾悬架动挠度和车轮动载荷的变化,以提高车辆行驶安全性和操纵稳定性,通过仿真计算和结果分析验证了其可行性和有效性。 相似文献
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S. NARAYANAN Professor G.V. Raju 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1992,21(1):73-87
Active control of non-stationary response of a single degree of freedom vehicle model with nonlinear passive suspension elements is considered in this paper. The method of equivalent linearization is used to derive the equivalent linear model and the optimal control laws are obtained by using stochastic optimal control theory based on full state information. Velocity squared quadratic damping and hysteresis type of stiffness nonlinearities are considered. The effect of the nonlinearities on the active system performance is studied. The performance of active suspensions with nonlinear passive elements is found to be superior to the corresponding passive suspension systems. 相似文献
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SUMMARY Active control of non-stationary response of a single degree of freedom vehicle model with nonlinear passive suspension elements is considered in this paper. The method of equivalent linearization is used to derive the equivalent linear model and the optimal control laws are obtained by using stochastic optimal control theory based on full state information. Velocity squared quadratic damping and hysteresis type of stiffness nonlinearities are considered. The effect of the nonlinearities on the active system performance is studied. The performance of active suspensions with nonlinear passive elements is found to be superior to the corresponding passive suspension systems. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(7):575-595
This paper discusses the nonlinear properties of inerters and their impact on vehicle suspension control. The inerter was recently introduced as an ideal mechanical two-terminal element, which is a substitute for the mass element, where the applied force is proportional to the relative acceleration across the terminals. Until now, ideal inerters have been applied to vehicle, motorcycle and train suspension systems, in which significant performance improvement was achieved. However, due to the mechanical construction, some nonlinear properties of the existing mechanical models of inerters are noted. This paper investigates the inerter nonlinearities, including friction, backlash and the elastic effect, and their influence on vehicle suspension performance. A testing platform is also built to verify the nonlinear properties of the inerter model. 相似文献