共查询到19条相似文献,搜索用时 171 毫秒
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为建立某FSAE赛车的虚拟样机模型及评价其操作稳定性,采用机械系统动力学分析软件ADAMS中的ADAMS/CAR模块,建立了某中国大学生方程式(FSAE)赛车模型,并介绍了模型的过程及要点.仿真结果表明:在一定路面情况下,不同的车速对赛车的转向系统的影响不同,在一定的车速和路面情况下,前悬架阻尼的增加或者减少对转向系统的影响最大,相比之下,后悬架的刚度和阻尼对转向盘的振动影响小于前悬架,后悬架的阻尼比后悬架的刚度对转向系统的稳定性影响大些. 相似文献
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针对汽车转向轮摆振引发的转向盘和车身振动现象,选用某型轻卡商用车作为样车,考虑悬架及转向系统干摩擦和轮胎非线性,应用拉格朗日方程建立了包含转向盘和车身的整车十自由度振动力学模型,轮胎力选用魔术公式模型,干摩擦选用Stefanski-Wojewoda模型。运用数值分析方法,对由转向轮摆振引发的整车振动系统进行分析计算,结果表明前轮摆振诱发整车产生自激振动多极限环现象,大幅自激振动与初始激励大小相关;振动幅值随车速增加呈现先增后减趋势;干摩擦幅值增加,摆振幅值和区间都相应减小,且多环区间加大,中间过渡单环区间消失。 相似文献
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为解决钢结构转向体系设计中锚栓受力不明确的问题,采用Abaqus/CAE三维建模软件分别对块式和横隔板式2种钢结构类型的体外预应力束转向体系建立了2种转向体系的有限元模型,并为了精确模拟锚栓的粘结-滑移特性,对锚栓节点采用了非线性弹簧本构,基于有限元计算结果分析了2种转向器受力及变形特性。结果表明:1)块式转向体系结构刚度一般,在转向力作用下锚栓受力较大,结构安全系数较低;2)横隔板式转向体系结构刚度较大,在转向力作用下,结构破坏形态是钢结构屈曲,锚栓受力较小,整个结构安全系数极高。 相似文献
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P. E. Pfeffer M. Harrer D. N. Johnston 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2008,46(5):413-428
For the on-centre handling behaviour of vehicles the steering system is absolutely important. To investigate the interaction of the vehicle and steering system a validated, especially tailored simulation model was developed. Some meaningful vehicle and steering system parameters are altered to show the influence on steering wheel torque, steering feel and understeer. The results underline the importance of an accurate steering system model. Identified measures to improve the centre feel and steering response were a stiffer torsion bar, a higher cornering stiffness or a lower overall steering ratio. The steering response, however, suffers when the centre feel is improved by a higher trail. The steering rack friction reduces mainly the steering response while the steering column friction decreases the centre feel whereas a stiffer torsion bar lessens the understeer tendency. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):413-428
For the on-centre handling behaviour of vehicles the steering system is absolutely important. To investigate the interaction of the vehicle and steering system a validated, especially tailored simulation model was developed. Some meaningful vehicle and steering system parameters are altered to show the influence on steering wheel torque, steering feel and understeer. The results underline the importance of an accurate steering system model. Identified measures to improve the centre feel and steering response were a stiffer torsion bar, a higher cornering stiffness or a lower overall steering ratio. The steering response, however, suffers when the centre feel is improved by a higher trail. The steering rack friction reduces mainly the steering response while the steering column friction decreases the centre feel whereas a stiffer torsion bar lessens the understeer tendency. 相似文献
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EPS(电动助力转向系统)应用于众多车型,代表未来动力转向的发展方向。文章通过对EPS的分析,初步设定了用于该EPS的激他式直流电动机方案。通过建立电动机的数学模型,在MATLAB中实现了该模型,并通过仿真分析,进一步验证了该选择方案的正确性。指出所选择建立的电动机模型,对电动助力转向系统仿真分析中电动机模型的建立选择具有一定的借鉴作用。 相似文献
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本文主要介绍了牵引车双前桥转向系统的设计,转向器、动转泵的匹配设计,并应用UGNX6软件建立了转向系统的三维模型,对转向系统进行设计校核和优化,设计出性能优越的双前桥动力转向系统。 相似文献
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This paper discusses the development of a system model for the wireless steering wheel angle sensor and steering wheel system
for the evaluation of the steer by wire system in a vehicle dynamic system. The steering wheel sensor is a wireless, contact-less
sensor utilizing an optical medium for angle detection. The optical medium is operated based on a photodiode and photo-detector
head. A reflecting disc or code-wheel, working similar to a compact disc, is used to reflect the light from the photodiode
back to the photo-detector. The beam is reflected based on the content in the reflective disc to measure the relative angle
through a micro-controller. The proposed wireless steering sensor and steer by wire system is modeled using the Matlab/Simulink
and their performance is investigated to evaluate the steering response, vehicle dynamics, and steering feel of the system.
Finally, the feasibility of the proposed system is discussed based on the developed model and simulation results. 相似文献
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为了提高智能汽车的主动安全性,提出3种不同的自动紧急转向避撞跟踪控制方法。首先建立汽车避撞简化模型,对制动、转向及两者相结合的3种不同避撞方式进行对比分析。其次,为深入研究汽车避撞过程中的实际响应,建立包含转向、制动及悬架3个子系统耦合特性的底盘18自由度统一动力学模型,并进行相关试验验证。随后构建智能汽车自动紧急转向避撞控制框架,对五次多项式参考路径和七次多项式参考路径的横摆角速度和横摆角加速度进行对比分析。接着以线性2自由度转向动力学模型为参考对象,对最优控制四轮转向、最优控制前轮转向、前馈与反馈控制相结合的前轮转向3种不同的跟踪控制系统分别进行设计。最后,以汽车底盘18自由度统一动力学模型为研究对象,对上述3种避撞控制系统进行仿真试验对比分析。研究结果表明:与制动避撞相比而言,转向避撞所需的纵向距离有较大降低,随着车速的增加和路面附着系数的越低,效果越明显;七次多项式参考路径比五次多项式参考路径的避撞过渡过程更为平缓,当实际车速与控制器所用车速不一致时,前者避撞性能表现更优;最优四轮转向控制系统在高、低2种不同附着路面都具有较好的避撞效果,最优前轮转向控制系统次之,而前馈与反馈相结合的前轮转向控制系统在低附着路面上则表现出严重的失稳。 相似文献