共查询到19条相似文献,搜索用时 296 毫秒
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为验证零件制造及装配偏差是否满足麦弗逊悬架前轮外倾角偏差设计要求,基于三维偏差分析软件3DCS建立误差分析模型,对前轮外倾角偏差进行仿真分析,同时基于前轮外倾角计算公式,对其进行理论分析与计算。依据分析结果对影响最大的零件公差进行修正,将减振器与转向节装配偏差由0.7 mm改为0.3 mm,转向节与减振器安装孔位置度由0.6 mm改为0.4 mm,经计算及实际生产验证,前轮外倾角偏差满足设计要求,解决了麦弗逊悬架前轮外倾角过线率低的问题。 相似文献
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《汽车科技》2017,(3)
整车尺寸工程覆盖新车型开发的整个过程,这个过程中需要完成上百零件的公差设计。为缩短新产品的研发周期,并且制造出的新产品能够精确地达到设计的产品目标,高效准确的前期三维偏差分析与控制成为尺寸公差设计的重要环节。本文介绍了常用的三维偏差分析基本原理和偏差分析软件使用的假设条件,并且以公司某车型尾灯到尾门的装配为例,介绍了在考虑重力影响下的三维尺寸偏差分析模型的创建。本文采用软件提供的添加孔销Vis VSA浮动的自定义装配功能,模拟重力影响下前大灯和翼子板的装配,达到预期的研究目的。这种考虑重力因素影响下的三维偏差分析方法,可适用于汽车上其他零件的尺寸偏差分析。 相似文献
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基于VisVSA技术的汽车装配公差分析 总被引:1,自引:0,他引:1
VisVSA是一种以服从正态分布的蒙特卡罗法为计算核心,可以为机械系统装配提供高信度计算依据的公差分析软件。本文利用VisVSA技术对整车不同类型的集成分静态和动态两方面论述。在可能影响到装配性能的因素中,通过对比分析方式,重点论述了装配顺序对车门缝隙和面差的影响及装配公差在设计载荷下对底盘系统转向角度的影响。 相似文献
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车轮外倾角与车轮前束值是车轮定位中的两个重要参数,车轮前束是为了抵消车轮外倾产生的侧滑不利影响,因此前束值要与车轮的外倾角有合理的匹配。综合考虑车辆的结构参数和轮胎特性,基于车轮的侧滑机理,推导出车轮外倾角与前束值的合理匹配关系模型,用试验结果验证了模型的正确性,为在车辆的设计开发过程中,合理的确定车轮的外倾角与前束值提供理论参考。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1861-1875
The lateral force of a tyre is a function of the sideslip and camber angles. The camber angle can provide a significant effect on the stability of a vehicle by increasing or adjusting the required lateral force to keep the vehicle on the road. To control the camber angle and hence, the lateral force of each tyre, we can use the caster angle of the wheel. We introduce a possible variable and controllable caster angle ? in order to adjust the camber angle when the sideslip angle cannot be changed. As long as the left and right wheels are steering together according to a kinematic condition, such as Ackerman, the sideslip angle of the inner wheel cannot be increased independently to alter the reduced lateral force because of weight transfer and reduction of the normal load F z . A variable caster mechanism can adjust the caster angle of the wheels to achieve their top capacity and maximise the lateral force, when needed. Such a system would potentially increase the safety, stability, and maneuverability of the vehicles. Using the screw theory, this paper will examine the kinematics of a variable caster and present the required mathematical equation to calculate the camber angle as a function of suspension mechanism parameters and other relevant variables. Having a steered wheel about a tilted steering axis will change the position and orientation of the wheel with respect to the body of the car. This paper provides the required kinematics of such a suspension and extracts the equations in special practical situations. The analysis is for an ideal situation in which we substitute the tyre with its equivalent disc at the tyre plane. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):639-656
This paper analyses the dynamic response of a motorcycle with an anti-lock brake system (ABS) and camber or steering angle. Most studies have assumed that motorcycles brake in a straight line – that is, without a steering or camber angle. In this work, the performance of an ABS modulator is designed and analysed at first. Then, a controller is designed for motorcycle turning. The controller uses angular acceleration and the pressure value in brake calipers on the front and rear wheels, camber angle and lateral acceleration as commands to control brake pressure on each wheel to prevent wheel locking. The equation of motion for a motorcycle is based on Weir's equations. This motorcycle model combines a mathematical equation of the ABS modulator, tyre model and controller in simulations. 相似文献
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南京长江三桥钢索塔施工测量技术 总被引:1,自引:1,他引:0
南京长江三桥为我国首座采用钢索塔结构的特大型斜拉桥。针对机加工车间的钢索塔节段预拼装工艺流程和桥位现场的钢索塔拼装施工流程,研究了预拼装过程中的微型控制网建立、测量点选择、钢索塔节段温度测量、钢索塔轴线偏差等方面的测量技术和数据处理方法。根据钢索塔的施工流程,提出了钢索塔拼装控制网布设、拼装定位等测量与数据处理方案;通过预拼装测量获取钢索塔已预拼装节段的状态,指导了钢索塔后继节段加工与调整,为桥位施工现场钢索塔拼装提供数据和保证了钢索塔拼装的顺利进行。南京三桥钢索塔的各项竣工数据指标均优于钢索塔验收标准,说明所采用的钢索塔施工测量方法完全满足特大型桥梁钢索塔设计、施工的需要,可以为同类型的工程提供参考。 相似文献
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Y.Q. Wang Doctoral candidate R. Gnadler Professor Dr.-Ing. R. Schieschke 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1994,23(1):149-163
A mathematical model of a two-dimensional contact patch of pneumatic tires rolling over a rigid flat road surface at arbitrary slip and camber angles has been developed. The model is simple in concept, contains few parameters and is applicable to any tire simulation models. In addition to tire geometric parameters and vertical deflection, the carcass camber angle is introduced in the model. This angle is alone responsible for the asymmetric shape of the tire contact patch when the tire undergoes a lateral force. The computed contact patches agree well with the measured patches of an automotive tire at different slip and camber angles. Lastly, the influence of the contact patch geometry on the tire cornering and aligning properties has been discussed through a computational example. It has been shown that the effect of tire contact patch geometry on the steady state behavior is rather remarkable. 相似文献
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This paper develops a computational model that can analyze the kinematics and compliance characteristics of the front suspension
of a commercial vehicle. This computational model is called the flexible multi-body dynamic model because it is developed
by interfacing the finite element model of the multi-leaf spring with the dynamic model of the front suspension. In this paper,
the bump mode and roll mode tests are performed with a suspension parameter measuring device (SPMD). An excitation load for
creating the bump mode and roll mode motion is applied on the left and right tires slowly in in-phase and out-of-phase modes.
In the test, wheel rate, toe angle change, caster angle change, and camber angle change, which together represent the wheel
alignment, are measured along with the longitudinal and lateral wheel center loci which together represent the wheel center
trajectory change. The reliability of the developed computational model is verified by comparing the simulation results with
the SPMD test results. The developed flexible multi-body computational model will provide useful information on kinematics
and compliance characteristics in the earliest stages of the commercial vehicle design process. 相似文献