共查询到19条相似文献,搜索用时 234 毫秒
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道路谱的动态载荷是分析底盘件及车身连接点疲劳的关键输入,采集试验场路谱信号,利用Virtual. Lab创建带有整体式车架的整车刚柔耦合多体模型,通过时域波型复现技术(TWR) 虚拟迭代的方式得到轴头位移驱动信号,进而分解获得悬架接附点载荷谱,并在数据处理软件Tecware中对比载荷预测的结果,从而为车架的疲劳分析提供载荷输入。 相似文献
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为对轿车车内中频噪声进行预测,对轿车车身各子系统进行划分,建立了轿车整车混合FE-SEA模型;采用理论和试验相结合的方法求得车身结构的模态密度、内损耗因子和车身板件的辐射效率;采用理论计算方法确定发动机悬置点的激励和路面对车身在前后悬架与车身连接点处的激励.分别用施加激励后的混合FE-SEA模型和SEA模型预测驾驶员右耳旁的噪声,并与试验进行对比.结果表明:在200~1000Hz 整个频率范围内,FE-SEA混合模型的预测结果与试验数据吻合良好,明显优于SEA模型的预测结果,尤其足中频段. 相似文献
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某货车驾驶室疲劳载荷激励输入位置位于驾驶室与悬置连接处,在进行整车强化道路耐久试验时无法安装设备直接采集。为获取较为准确的驾驶室疲劳寿命分析载荷谱,对强化耐久路面下整车加速度响应信号进行虚拟迭代。虚拟迭代时需调用整车多体动力学模型,为提高整车模型精度,基于Craig-Bampton综合模态理论生成柔性体车架,建立刚柔耦合的整车多体动力学模型。将Femfat-lab与ADAMS/Car进行联合仿真计算,以白噪声为初始输入,求解刚柔耦合整车多体动力学模型的非线性传递函数,基于循环迭代原理,进行各种典型强化路况下驾驶室悬置附近加速度响应信号的虚拟迭代。利用时域信号对比法及损伤阈值法作为迭代收敛判据,获得满足精度需求的位移驱动信号。将位移驱动信号导入到ADAMS/Car中,对整车多体动力学模型进行驱动仿真,提取驾驶室疲劳分析所需激励载荷谱,将虚拟迭代求得的载荷谱用于疲劳寿命分析所得结果与驾驶室疲劳强化台架试验结果进行对比。研究结果表明:出现疲劳破坏的部位相同度达75%,疲劳寿命误差在20%左右,表明虚拟迭代过程中基于柔性体车架建立的刚柔耦合多体动力学模型的仿真计算,可获得较高精度的迭代结果;以位移谱驱动整车多体动力学模型进行仿真能够有效避免六分力直接驱动时模型翻转等不稳定现象,并且整车模型仿真加速度响应结果与实测相应位置加速度响应吻合度较高;相比于传统的疲劳分析载荷获取方法,虚拟迭代技术可以在较低试验成本的情况下获取较高精度的载荷谱,并能够提取由于连接位置导致的无法直接进行载荷测量部位的疲劳分析载荷。 相似文献
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针对某型低平板半挂车在早期行驶中出现车架及前悬支架的断裂情况,文章利用有限元软件对整车及关键零部件进行受力分析,结果表明:满载工况下车架及前悬支架存在多处应力集中,运行中易导致结构疲劳断裂。提出为防止局部结构的疲劳破坏,应加强焊接质量控制及消除焊接残余应力,改进后能确保低平板半挂车在预期使用条件下的安全。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1775-1794
ABSTRACTThis paper introduces the concept of managing air in commercial vehicle suspensions for reducing body roll. A conventional pneumatic suspension is re-designed to include higher-flow air hoses and dual levelling valves for improving the dynamic response of the suspension to the body roll, which commonly happens at relatively low frequencies. The improved air management allows air to get from the air tank to the airsprings quicker, and also changes the side-to-side suspension air pressure such that the suspension forces can more readily level the vehicle body, much in the same manner as an anti-roll bar (ARB). The results of a multi-domain simulation study in AMESim and TruckSim indicate that the proposed suspension configuration is capable of providing balanced airflow to the truck’s drive-axle suspensions, resulting in balanced suspension forces in response to single lane change and steady-state cornering steering maneuvers. The simulation results further indicate that a truck equipped with the reconfigured suspension experiences a uniform dynamic load sharing, smoother body motion (less roll angle), and improved handling and stability during steering maneuvers commonly occurring in commercial trucks during their intended use. 相似文献
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Prediction of fatigue life and estimation of its reliability on the parts of an air suspension system 总被引:1,自引:0,他引:1
K. J. Jun T. W. Park S. H. Lee S. P. Jung J. W. Yoon 《International Journal of Automotive Technology》2008,9(6):741-747
Air suspension systems have been implemented in various commercial vehicles, such as buses and special purpose trucks, because
of the comfortable ride and easy height control. An evaluation of the durability of vehicle parts has been required for service
life and safety starting in the early stages of design. The cyclic load applied to the vehicle can cause fatigue failure of
parts, such as the suspension frame. This paper presents a method to predict the fatigue life of the suspension frame at the
design stage of the air suspension system used in a heavy-duty vehicle. To estimate the fatigue life using the SN method,
the Dynamic Stress Time History (DSTH) is necessary for the part of interest. DSTH can be obtained from the results of the
flexible body dynamic analysis using the Belgian road simulation and the Modal Stress Recovery (MSR) method. Furthermore,
the reliability of the predicted fatigue life can be evaluated by considering the variations in material properties. The probability
and distribution of the expected life cycle can be obtained using experimental design with a minimum number of simulations.
The advantage of using statistical methods to evaluate the life cycle is the ability to predict replacement time and the probability
of failure of mass-produced parts. This paper proposes a rapid and simple method that can be effectively applied to the design
of vehicle parts. 相似文献
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The eight-channel test rig is widely used in durability assessment of vehicle components while for some cases of rear suspension,
this costly instrument is unnecessary. Based on the analysis of structure and forces, a simpler one-channel testing approach
is presented for the durability calculation of a dependent rear suspension. Taking a punched rear shock tower as the study
object, a FEA strain-stress analysis was first performed to determine the risk area. Then, the entire vehicle test system
was created, and the proving ground tests were carried out so that the real strain on the part could be measured. Based on
the road test data and the P-S-N curve of the component, the cumulative fatigue damage of a 15,000-kilometer proving ground
test road was calculated, and the computational result indicates that the modified structure was safe for durability analysis.
Moreover, a standard 50% S-N survival fraction curve was plotted using Corten and Dolan’s method, which can be utilized in
the durability analysis for other similar components. Finally, the road test for this modified suspension structure was carried
out, and the test result certified that the punched shock tower can be subjected to a 15,000-kilometer proving ground test
road without the appearance of fatigue failure. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(10):1588-1602
This paper presents the active case of a variable stiffness suspension system. The central concept is based on a recently designed variable stiffness mechanism which consists of a horizontal control strut and a vertical strut. The horizontal strut is used to vary the load transfer ratio by actively controlling the location of the point of attachment of the vertical strut to the car body. The control algorithm, effected by a hydraulic actuator, uses the concept of nonlinear energy sink (NES) to effectively transfer the vibrational energy in the sprung mass to a control mass, thereby reducing the transfer of energy from road disturbance to the car body at a relatively lower cost compared to the traditional active suspension using the skyhook concept. The analyses and simulation results show that a better performance can be achieved by subjecting the point of attachment of a suspension system, to the chassis, to the influence of a horizontal NES system. 相似文献
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D. N. L. Horton D. A. Crolla 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1986,15(6):351-372
A theoretical analysis is presented to model a hydromechanical, semi-active suspension system, first as a single wheel station and then as fitted to each wheel of an off-road vehicle. Predicted results show that two benefits are obtained by comparison with the equivalent passive system. First, vehicle attitude is controlled for changes in body forces arising from static loads or braking/cornering inputs. Second, a significant improvement in ride comfort is obtained because low suspension stiffnesses can be used. 相似文献