共查询到20条相似文献,搜索用时 234 毫秒
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优化车端悬挂及其核心部件对提高高速列车的运行动力学性能具有重要意义。以某动车组车辆间减振器为研究对象,通过分析其阀片式阀系的流量-压力特性,建立了其阻尼特性的参数化模型,并通过产品台架实验验证了仿真结果和理论模型的正确性。基于SIMPACK软件环境建立了该动车组的多体系统动力学仿真模型,研究了车辆间减振器阻尼系数对动车组动力学包括会车响应的影响,结果表明:车辆间减振器能明显地抑制车辆正常运行期间车端的复杂横向振动,提高乘坐舒适性,还能极大地抑制会车期间车体的大幅复杂横向晃动尤其是车体侧滚,并减小轮轴横向力和脱轨系数,增强高速列车的整体性和安全性。所获得的车辆间减振器参数化数学模型、车辆多体动力学仿真模型以及研究结果为下一步该车辆间减振器阻尼特性的动力学优选以及减振器产品本身的优化设计提供了基础。 相似文献
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两级阻尼可调式液压减振器的性能仿真与试验 总被引:1,自引:0,他引:1
可调阻尼减振器是汽车半主动悬架的关键部件.根据某大客车电控半主动悬架的阻尼控制要求,以该车原被动式液压减振器为基础,设计出一种具有两级阻尼特性的可调减振器.采用共轭梁法计算节流阀片的挠曲变形,建立该减振器阻尼特性的数学模型,仿真分析活塞杆直径,阻尼阀孔径以及调节孔孔径等主要结构参数对减振器阻尼性能的影响,在此基础上确定可调减振器的主要设计参数.对研制的可调减振器样件进行阻尼性能测试,结果表明:减振器的两级阻尼状态变化明显,阻尼切换控制准确,阻尼力试验值与仿真值的偏差小于8%,说明所建的减振器数学模型具有较高的精度,采用共轭粱法计算节流阀片挠曲变形是可行有效的,为设计开发可调阻尼液压减振器和研究汽车半主动悬架提供了重要依据. 相似文献
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以某种电磁阀式阻尼可调减振器为研究对象,通过实物拆解和对其结构原理进行分析,根据减振器节流孔油液流动及开阀压力,分别推导电磁阀式阻尼可调减振器在伸张行程和压缩行程的阻尼力计算公式。对拆解的电磁阀式阻尼可调减振对其阀口及阻尼孔进行测量,借助AMESim软件搭建减振器精细模型,并将该可调减震器AMESim仿真模型的力学特性与可调减震器实物的力学特性对比,验证模型的正确性。对此类电磁阀式阻尼可调式减振器模型的建立对研究汽车半主动悬架的控制具有重要意义。 相似文献
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阀片变形极大地影响了减振器的阻尼特性,提高阀片变形量的计算精度,可进一步精确分析CDC减振器的阻尼特性。根据热弹性理论和大、小挠度理论,推导了环形阀片任意半径处的变形解析解,从而建立了温度-压力复合作用下的阀片变形数学模型,开展了温度场和静力学仿真验证,基于Simulink搭建了考虑阀片热变形的CDC减振器阻尼力的数学模型,并将仿真结果与实验结果进行对比。结果表明:阀片变形解析解与仿真结果误差在5%以内,阻尼力模型仿真结果与实验结果误差在10%以内。该阀片变形数学模型和阻尼力模型均提高了减振器阻尼特性的计算精度,为阀片变形计算和减振器阻尼特性的研究提供了理论基础。 相似文献
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基于流—固耦合的汽车减振器动态特性仿真分析 总被引:2,自引:0,他引:2
对减振器的流—固耦合建模和求解技术进行研究。基于多求解器的流—固耦合方法,建立精度较高的阻尼阀流场网格模型和叠加阀片有限元接触模型,并联合有限体积法和有限元法对减振器流—固耦合模型进行求解和分析,获取了减振器的速度特性和示功图,对阻尼阀内部压力场、速度场进行详细分析,对叠加阀片非线性动力学特性进行分析。仿真结果表明:由于高速油液对阻尼阀壁面的冲击作用,阻尼阀核心区域的压力场急剧变化;阀片在开启和关闭瞬间,速度有一个跳跃,这使得节流通道迅速变化,具体表现为开阀点附近的速度特性曲线向下弯折。因此,阻尼阀核心区域的流场网格模型和叠加阀片的接触模型对仿真精度影响最大。计算中考虑了油液的湍流流动,阀片的接触滑移和大挠度变形,使得流—固耦合模型尽可能地贴近物理事实,仿真结果与试验吻合较好。 相似文献
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针对某轿车后悬架减振器出现的异响问题,进行阻尼器高频振动试验,对位移-阻尼力图形分析确定异响由复原阀系造成,通过对复原阀系进行结构设计优化,改善位移-阻尼力图形,最后将改善后的复原阀系装配于新的减振器进行噪声台架测试验证和整车道路试验验证,结果表明,改进后的减振器异响消除。 相似文献
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In this study, a new mathematical dynamic model of displacement sensitive shock absorber (DSSA) is proposed to predict the
dynamic characteristics of automotive shock absorber The performance of shock absorber is directly related to the vehicle
behaviors and performance, both for handling and ride comfort The proposed model of the DSSA has two modes of damping foice
(i e soft and hard) according to the position of piston In this paper, the performance of the DSSA is analyzed by considering
the transient zone for more exact dynamic characteristics For the mathematical modeling of DSSA, flow continuity equations
at the compression and rebound chamber are formulated And the flow equations at the compression and rebound stroke are formulated,
respectively. Also, the flow analysis at the reservoir chamber is carried out Accordingly, the damping force of the shock
absorber is determined by the forces acting on the both side of piston The analytic result of damping force characteristics
are compared with the experimental results to prove the effectiveness Especially, the effects of displacement sensitive orifice
area and the effects of displacement sensitive orifice length on the damping force are observed, respectively The results
reported herein will provide a better understanding of the shock absorber 相似文献
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为建立减振器参数化数学模型,基于圆薄板大挠曲理论和弹性力学原理,推导出了阀片大挠曲变形与半径的关系式。建立外半径不全相等时环形叠加阀片的力学模型,提出用大挠曲变形解析方法与有限元分析相结合的等效模型求解方式推导出该环形叠加阀片挠曲变形的解析式。根据活塞阀系叠加阀片与复原弹簧同时变形的串联原理,建立了该双筒式减振器在复原与压缩行程中阻尼特性的数学模型。采用NSGA-Ⅱ算法对模型中难以测量的参数进行辨识,辨识后的减振器外特性仿真结果与试验数据基本吻合,说明所建立的参数化模型比较可靠,对减振器的性能调试具有指导意义。 相似文献
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针对油液泄漏导致的减振器失效问题,以某国产液压减振器为研究对象,通过分析其结构以及工作原理,建立减振器阻尼力的数学表达式以及AMESim一维仿真模型,仿真得到其不同速度下的示功图以及阻尼特性曲线,并与试验结果进行对比,仿真结果与试验结果能够较好的吻合,表明用AMESim所建立的一维仿真模型真实可靠。基于该仿真模型仿真活塞缝隙、底阀、活塞杆与密封圈缝隙的油液泄漏而导致的减振器失效问题,对比不同状态下的阻尼特性曲线,发现仿真模型可以较好的进行减振器失效的仿真分析,表明仿真模型能够指导实际工程设计以及相关的性能预测。 相似文献
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A high-frequency first-principle model of a shock absorber and servo-hydraulic tester 总被引:1,自引:0,他引:1
The aim of this paper is to present the model of a complete system, consisting of a variable damping shock absorber and a specialized servo-hydraulic tester, used to evaluate the vibration levels produced by a shock absorber. This kind of evaluation is used within the automotive industry to investigate shock absorbers, as an alternative to vehicle-level tests. The purpose of such testing is to quantify a shock absorber's ability to transfer the mid- and high-frequency content of the vibrations passing from the road profile, through the suspension, to the vehicle body. The first-principle non-linear model formulated, derived and validated in this paper allows laboratory test conditions to be reproduced. It also provides an understanding of structural vibrations in regard to the dynamical interactions between the shock absorber, its basic components (e.g. valve systems), mounting elements, and the hydraulic actuator. The model is capable of capturing important dynamical properties over a wide operating range, yet is only moderately complex. The model has proved to be qualitatively suitable and quantitatively accurate based on validation work performed for the entire frequency range of interest, i.e. 0-700 Hz. The application scope of this study covers the engineering need to develop a simulation tool for high-frequency shock absorber design optimization. 相似文献
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《Mechanical Systems and Signal Processing》2006,20(2):373-388
In this study, a new mathematical dynamic model of shock absorber is proposed to predict the dynamic characteristics of an automotive system. The performance of shock absorber is directly related to the car behaviours and performance, both for handling and ride comfort. Damping characteristics of automotive can be analysed by considering the performance of displacement-sensitive shock absorber (DSSA) for the ride comfort. The proposed model of the DSSA is considered as two modes of damping force (i.e. soft and hard) according to the position of piston. For the simulation validation of vehicle-dynamic characteristics, the DSSA is mathematically modelled by considering the fluid flow in chamber and valve in accordance with the hard, transient and soft zone. And the vehicle dynamic characteristic of the DSSA is analysed using quarter car model. To show the effectiveness of the proposed damper, the analysed results of damping characteristics were compared with the experimental results, which showed similar behaviour with the corresponding experimental one. The simulation results of frequency response are compared with the ones of passive shock absorber. From the simulation results of the DSSA, it can be concluded that the ride comfort of the DSSA increased at the low-amplitude road condition and the driving safety was increased partially at the high-amplitude road condition. The results reported herein will provide a better understanding of the shock absorber. Moreover, it is believed that those properties of the results can be utilised in the dynamic design of the automotive system. 相似文献
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液压减振器是通过消耗机械能实现减振目的的装置,但目前其散热效果并不理想,温度升高导致了减振器整体性能下降。利用路面不平度激励模型、悬架系统振动模型、热量传递模型,通过能量守恒定律建立了液压减振器的热力学平衡数学模型。综合考虑油液泄漏特性、密封特性以及液压减振器阻尼性能界定其许用油温。对液压减振器散热参数进行了分析研究,且试验结果表明分析模型与设计方法正确,为减振器的设计提供参考。 相似文献
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A mathematical model is used to investigate automobile suspensions with both hydraulic and inertial-frictional shock absorbers. The optimal parameters of this combined damping system are determined for the suspension of the GAZ-66 vehicle. A prototype inertial-frictional shock absorber is described, and the results of road tests on the Gazel ambulance are presented. 相似文献
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