共查询到20条相似文献,搜索用时 156 毫秒
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采用有限元分析方法对运输状态下SX2180扩展厢式的车厢体进行了模态分析,计算得到了厢体低阶固有频率和振型,并通过对几种改变结构后厢体的分析计算,为解决厢体结构的共振问题和改进设计提出了建议. 相似文献
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采用uU软件建模,利用其内置的ADAMS和NX NASTRAN解算器进行机构分析和有限元分析,提高了设计质量和效率,计算结果为选择合适的机构参数及优化厢体结构提供了依据. 相似文献
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目前扩展厢体在各种通讯车、指挥车上得到了广泛应用,但存在空间使用浪费较大的现象.通常,当扩展厢体展开后,厢体和地板会形成一个平面以增加车内的有效空间,当厢体收缩时必须将地板掀起,否则会和移动的厢体形成机械干涉,而这样的掀起式地板就会造成整个地板空间的浪费;即便厢体展开后可以在地板区域放置一些移动式设备或座椅等,但每次厢体操作必须将移动式设备收起,造成很大不便.为此,笔者通过在厢体内采用整体式地板升降的设计,有效地解决了以上问题.此外,还增加了报警系统,可预警行车时扩展厢为伸出状态或未收缩到位,或厢体舱门未关闭等给行车带来的安全隐患,增加了系统安全性.因采用PLC控制,所以本系统可靠性高,易于操作,在扩展厢体控制系统中能充分发挥作用. 相似文献
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冷藏保温汽车厢体结构轻量化,并提高其隔热性能,符合国家的产业政策,属于国家鼓励和支持的范围。冷藏保温汽车的能耗主要来自两方面,一方面是制冷机维持厢内冷藏温度消耗的能源,它通常和冷藏厢体的保温性能有关。另一方面是冷藏保温汽车行驶时消耗的能源,它通常和厢体的自重有关。只有通过优化冷藏保温汽车厢体结构使其达到轻量化并提高其保温性能,才能使其达到节能环保的要求,既低碳又能降低运营成本。 相似文献
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J. H. Seo E. D. Lee J. W. Lee B. K. Han 《International Journal of Automotive Technology》2016,17(4):665-670
This study reports on the effect of vehicle tumble-home (side body inclination) on roof strength. The steep inclination of the side body of a vehicle increases its roof strength. Comprehensive analysis of the impact of high roof strength driven by the steep inclination on dynamic roof strength in rollover is described. Here, we have developed a numerical model using the ADAMS, which is capable of characterizing both of the static and the dynamic roof strength. According to the FMVSS 216 protocol, we achieve the strength to weight ratio (SWR; static roof strength) by applying loading plates to the roof of a vehicle. The Controlled Rollover Impact System (CRIS) allows us to quantitatively characterize the displacements of the top end of A-pillar and B-pillar, thus determining the dynamic roof strength by comparing the results. We demonstrated that the roof intrusion was one of the most critical causes which lead to injuries of occupants fastening seat belts. Our analysis revealed that the increase of the side body inclination of vehicles enhanced the static roof strength whereas it could not reduce the roof displacement (intrusion) in the dynamic rollover. 相似文献
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为了分析车辆荷载作用下沥青路面结构的细观状态力学响应,建立了二自由度1/4车辆模型与多层路基路面耦合离散元模型,通过各结构层单轴压缩应力-应变试验与相同工况试验数据比较,经迭代运算得到路面离散元模型各结构层细观参数,应用试验得到的沥青路面细观参数建立多层路基路面模型,在离散元模型的上表面设定一定不平度,在一定速度作用下,1/4车辆模型在路基路面离散元模型上表面匀速移动,从而求解车辆动荷载作用下沥青路面各结构位移、应力等细观受力状态。进而改变1/4车辆模型的车体悬架刚度、悬架阻尼系数、轮胎刚度,轮胎阻尼系数,从而获得在改变车辆参数作用下沥青路面内部的应力变化规律。研究结果表明:基于离散元理论不但可以求得沥青路面在车-路相互作用下各层的应力与变形,而且还可以求得沥青路面各结构层颗粒流的变化趋势,在车辆移动荷载作用下,随着路基路面深度增加,各结构层颗粒流竖直方向动态位移与应力响应依次减少,其中上基层颗粒流动位移比上面层颗粒流动位移减少25%,下面层颗粒流竖向应力约为上面层颗粒流竖向应力的50%,水平方向上颗粒流既有压应力又有拉应力,变化比较复杂,上面层颗粒流水平方向主要承受压应力,其余结构层主要承受拉应力;增加轮胎与悬架刚度系数对模型颗粒流水平方向拉应力影响较大,增加轮胎与悬架阻尼系数对垂直方向颗粒流压应力与水平方向拉应力影响较小。 相似文献
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汽车轻量化,是指从汽车整体的安全性能和车身结构强度出发,尽可能减轻汽车车身重量,从而达到提高整车性能、增加续航里程的目的。作为新能源汽车未来的发展方向,纯电动汽车在生产制造中的轻量化研究迫在眉睫。文章主要阐述了以铝合金为代表的轻量化材料在纯电动汽车上的应用,并介绍了几种新型连接技术的特点,以对国内纯电动汽车轻量化研究提供有益借鉴。 相似文献
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Orang Vahid Amir Khajepour Fathy Ismail 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2007,45(12):1131-1147
In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1131-1147
In this paper, an in situ method has been used to find the optimum set of body mounts for a given vehicle. The strength of this method is that it does not require the vehicle to be disassembled. Standard noise, vibration and harshness testing procedures are used to obtain frequency response function (FRF) models of the vehicle's subsystems. This is followed by FRF-based substructuring synthesis approach to obtain the overall vehicle model. The model is incorporated into an optimization algorithm to predict the optimum set of body mounts for a desired objective function. The in situ method is presented and applied to an experimental case study of a pick up truck. The experimental results confirmed the validity and effectiveness of this approach in finding the optimum body mount set, resulting in significant reduction in the vibration level of the vehicle. 相似文献