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本文采用有限元方法,利用ANSYS软件对HFF6900KZ-8承载式客车车身骨架进行有限元建模,并对其进行强度和刚度分析,在对车身骨架静、动态特性详细分析研究后,提出了车身骨架的轻量化设计方案,并进行了实验验证。 相似文献
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电阻点焊是白车身制造过程中主要的装配工艺手段,其数量和布置会对白车身动刚度和静刚度产生很大的影响,但这两种影响并不总是一致的。因此,在以同时提升动/静刚度为目标的焊点优化中,需要一种能够兼顾动刚度和静刚度的指标,同时还要确保生产中的工业鲁棒性,使焊点设计方案实施效果不会轻易受到焊点制造缺陷的影响。本文中提出了一种以焊点及相邻单元应变能为基础,兼顾动刚度性能和静刚度性能的焊点优化决策指标,并利用该指标,构建了高效的鲁棒性分析方案,从而形成了一种多目标的焊点自适应优化方法,能实现同时考虑多种性能指标和鲁棒性的焊点优化过程。该方法被应用于某款轻型客车白车身焊点的性能优化和鲁棒性分析,并通过试验验证了其有效性。 相似文献
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A methodology for vehicle sideslip angle identification: comparison with experimental data 总被引:1,自引:0,他引:1
Federico Cheli Edoardo Sabbioni M. Pesce Stefano Melzi 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2007,45(6):549-563
Sideslip angle could provide important information concerning vehicle's stability. Unfortunately direct measurement of sideslip angle requires a complex and expensive experimental set-up, which is not suitable for implementation on ordinary passenger cars; thus, this quantity has to be estimated starting from the measurements of vehicle lateral/longitudinal acceleration, speed, yaw rate and steer angle. According to the proposed methodology, sideslip angle is estimated as a weighted mean of the results provided by a kinematic formulation and those obtained through a state observer based on vehicle single-track model. Kinematical formula is considered reliable for a transient manoeuvre, while the state observer is used in nearly quasi-state condition. The basic idea of the work is to make use of the information provided by the kinematic formulation during a transient manoeuvre to update the single-track model parameters (tires cornering stiffnesses). A fuzzy-logic procedure was implemented to identify steady state or transient conditions. 相似文献
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Nadir Ouddah Lounis Adouane Rustem Abdrakhmanov 《International Journal of Automotive Technology》2018,19(3):571-584
This paper details the development of an energy management strategy (EMS) for real-time control of a multi hybrid plug-in electric bus. The energy management problem has been formulated as an optimal control problem in order to minimize the fuel consumption of the bus drivetrain for a typical day of operation. Considering the physical characteristics of the studied hybrid electric bus and its well-known daily tour, the Pontryagin’s minimum principle (PMP) is firstly used as the mean to obtain offline optimal EMS. Afterward, in order to adapt the proposed strategy for real-time implementation, the proposed control parameters are adapted online using feedback from the battery state of energy (SOE) which allows us to accurately control the battery SOE in the presence of wide range of uncertainties. The work proposed in this paper is conducted on a dedicated high-fidelity dynamical model of the hybrid bus, that was developed on MATLAB/TruckMaker software. The performance evaluation of the proposed strategy is carried out using a normalized driving cycles to represent different driving scenarios. Obtained results show that among the investigated methods, it is reasonable to conclude that the proposed adaptive online strategy based on PMP is the most suitable to design the targeted EMS. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(6):549-563
Sideslip angle could provide important information concerning vehicle's stability. Unfortunately direct measurement of sideslip angle requires a complex and expensive experimental set-up, which is not suitable for implementation on ordinary passenger cars; thus, this quantity has to be estimated starting from the measurements of vehicle lateral/longitudinal acceleration, speed, yaw rate and steer angle. According to the proposed methodology, sideslip angle is estimated as a weighted mean of the results provided by a kinematic formulation and those obtained through a state observer based on vehicle single-track model. Kinematical formula is considered reliable for a transient manoeuvre, while the state observer is used in nearly quasi-state condition. The basic idea of the work is to make use of the information provided by the kinematic formulation during a transient manoeuvre to update the single-track model parameters (tires cornering stiffnesses). A fuzzy-logic procedure was implemented to identify steady state or transient conditions. 相似文献
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联合模态柔度和静力位移的桥梁有限元模型修正方法 总被引:3,自引:0,他引:3
利用商用软件ANSYS提供的零阶和一阶优化算法,通过1个仿真简支梁有限元模型修正算例,比较了不同目标函数的有限元模型修正效果,提出了一种联合动力模态柔度和静力位移的有限元模型修正方法,并将这种方法运用于一座加固后的刚架拱桥的有限元模型修正,建立起了该桥加固后的基准有限元模型。结果表明:利用修正后的刚架拱桥有限元模型计算的静、动力特性与实测结果吻合良好,这种联合静、动力的有限元模型修正方法具有比较好的模型修正效果,修正后的桥梁有限元模型可以服务于桥梁健康监测和安全评估。 相似文献
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A real-time approach to robust identification of tyre–road friction characteristics on mixed-μ roads
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1338-1362
ABSTRACTThe interaction between the tyre and the road is crucial for understanding the dynamic behaviour of a vehicle. The road–tyre friction characteristics play a key role in the design of braking, traction and stability control systems. Thus, in order to have a good performance of vehicle dynamic stability control, real-time estimation of the tyre–road friction coefficient is required. This paper presents a new development of an on-line tyre–road friction parameters estimation methodology and its implementation using both LuGre and Burckhardt tyre–road friction models. The proposed method provides the capability to observe the tyre–road friction coefficient directly using measurable signals in real-time. In the first step of our approach, the recursive least squares is employed to identify the linear parameterisation form of the Burckhardt model. The identified parameters provide, through a T–S fuzzy system, the initial values for the LuGre model. Then, a new LuGre model-based nonlinear least squares parameter estimation algorithm using the proposed static form of the LuGre to obtain the parameters of LuGre model based on recursive nonlinear optimisation of the curve fitting errors is presented. The effectiveness and performance of the algorithm are demonstrated through the real-time model simulations with different longitudinal speeds and different kinds of tyres on various road surface conditions in both Matlab/Carsim environments as well as collected data from real experiments on a commercial trailer. 相似文献
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根据相关标准对客车操纵稳定性的各项试验进行评分,进而评价其操纵稳定性的优劣。试验结果表明,该车的转向轻便性,稳态回转性能较好,而转向回正性能较差。此研究结果能够为该客车操纵稳定性的进一步改进提供依据。 相似文献
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为评价总线电压对电机转矩以及效率的影响,在动态测功机试验台架上设计相应的试验,测量总线电压在400~455 V之间变化时某三相异步感应电机的输出转矩和效率。结果表明,在电机低效率区域,电机效率受总线电压影响较大。电机输出转矩相对于目标转矩有平均0.5 s的延时,在高总线电压、高电机转速区域,电机控制器启动自保护功能,输出转矩远小于目标转矩。中国城市公交典型工况测试表明,对经济性影响最大的前80%的电机工况点主要分布于受总线电压变化影响较小的高效率区,在城市公交工况下对电机效率的粗略分析可以忽略总线电压的变化。 相似文献
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It is well known that vehicle slip angle is one of the most difficult parameters to measure on a vehicle during testing or racing activities. Moreover, the appropriate sensor is very expensive and it is often difficult to fit to a car, especially on race cars. We propose here a strategy to eliminate the need for this sensor by using a mathematical tool which gives a good estimation of the vehicle slip angle. A single-track car model, coupled with an extended Kalman filter, was used in order to achieve the result. Moreover, a tuning procedure is proposed that takes into consideration both nonlinear and saturation characteristics typical of vehicle lateral dynamics. The effectiveness of the proposed algorithm has been proven by both simulation results and real-world data. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1401-1437
There are many situations where physical testing of a vehicle or vehicle controller is necessary, yet use of a full-size vehicle is not practical. Some situations include implementation testing of novel actuation strategies, analysing the behaviour of chassis feedback control under system faults, or near-unstable situations such as limit handling under driver-assist feedback control. Historically, many have advocated the use of scale vehicles as surrogates for larger vehicles. This article presents analysis and experimental testing that examines the fidelity of using scaled vehicles for vehicle chassis dynamics and control studies. In support of this effort, this work introduces an experimental system called the Pennsylvania State University Rolling Roadway Simulator (the PURRS). In the PURRS, a custom-built scale-sized vehicle is freely driven on a moving roadway surface. While others have used scale-vehicle rolling roadway simulators in the past, this work is the first to attempt to directly match the planar dynamic performance of the scale-sized vehicle to a specific full-sized vehicle by careful design of the scale vehicle. This article explains details of this effort including vehicle dynamic modelling, detailed measurement of model parameters, conditions for dynamic similitude, validation of the resulting experimental vehicle in the time, frequency, and dimensionless domains. The results of the dynamic comparisons between scale- and full-sized vehicles clearly illustrate operational regimes where agreement is quite good, and other regimes where agreement is quite poor. Both are useful to understand the applicability of scale-vehicle results to full-size vehicle analysis. 相似文献
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为将准静荷载试验法中动态荷载-沉降曲线转换为静态荷载-沉降曲线,并尽量与工程实际相接近,对已有分析方法进行了适用性探讨和分析比较,在原有理论基础上提出了新的C模型分析方法,将整个试验过程中桩-土系统的阻尼系数按照理论前提随时间变化分为3段,各段分别计算,最后组合成随时间变化的阻尼系数曲线。然后根据单质点模型的平衡方程计算出静态P-S曲线。借助大型计算软件MATLAB,对具体工程实例分别采用已有方法与C模型法分别进行编程计算。计算结果表明:C模型法计算出的静态P-S曲线处于由卸载点法和起始刚度法得出的静态曲线之间,该方法能较合理地分析准静载荷试验法的荷载-沉降曲线。 相似文献
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对钢管混凝土系杆拱桥实施了常规检测和动、静载试验,并结合有限元建模与分析,最终对桥梁进行了安全评估。结论为:从荷载试验结果看,桥梁的各项检测指标符合试验规程要求,即当前满足于设计荷载等级,但由于该桥的结构特点,针对现存的安全隐患,应立即组织维修。 相似文献