轻型货车车架的有限元建模及模态分析

汽车结构模态分析在现代汽车结构设计中占据了极其重要的位置。文中论述了有限元分析的一般流程,并以某轻型货车车架为例,利用HyperWorks软件建立车架有限元分析模型,采用Nastran求解器对车架进行自由模态分析计算,分析了车架的前六阶固有频率和振型,为车架的响应分析奠定基础,同时也为结构的改进设计提供理论依据。     

江铃轻型货车行驶平顺性的改善

本文针对江铃轻型货车行驶平顺性不佳问题。进行了系统的道路试验，电液伺服模拟激振试验，模态试验和理论分析；查明了该车平顺性不佳的主要原因是前后悬架刚度过大，特别是后悬架在空载时；在不改变钢板弹簧安装尺寸的条件下对前后板簧进行了改进设计。试制后装车试验表明，行驶平顺性显著提高，操纵稳定性有一定改善。改进型板簧、台架的疲劳寿命达到了标准要求，在行驶可靠性试验中未出现板簧损坏。改进型板簧比原车板簧质量减轻     

轻型货车市场1998年回顾及1999年分析

１９９８年轻型货车总销量约为２９．４万辆，市场特点是：市场份额的增长表现在新产品拉动上，总体产品在低价位上运行，企业经营效益继续下滑，市场缺少新的增长点，企业更加重视销售体制和营销网络的建设。１９９９年轻型货车需求总量为３０．５万辆，产品市场价格水平将在１９９８年的基础上略有浮动。     

轻型货车驾驶室偏斜分析与改进

文章描述了轻型货车可翻转驾驶室悬置系统的结构型式,工作原理和相应的特点。给出驾驶室偏斜的主要原因,并针对性地提出了解决偏斜的具体方案措施,在样车上取得了良好的验证效果。     

我国轻型货车行业发展态势及市场前景

2001年我国轻型货车产、销量较上年分别下降了7．13％和7．1％，市场份额比上年下降了3．66个百分点。其主要原因是由于生产企业众多、竞争激烈而导致的市场严重供过于求。此外，国家陆续出台的各项政策和加入WTO也对我国轻型货车市场的需求产生较大的影响。预计2002年我国轻型货车产销量约为35－39万辆左右，基本与上年持平。     

三吨轻型车桥壳用钢的开发与应用研究

首次提出开发汽车桥壳专用钢，并与国内主要钢厂成功合作研制开发出符合国情的桥壳用钢，使用结果令人满意。     

抑制桥梁结构横向振动的半主动控制方法

研究了桥梁结构的半主动控制问题，在算法上采用基于神经网络的模糊控制，不需要建立精确的分析模型，计算较为简便，避免了用多参量建立模糊关系方程的求解困难，并与二次最优控制算法进行了对比。数值结果表明，提出的半主动控制系统对减小结构的地震响应是有效的。     

某载货汽车自燃的分析

本文首先通过驾驶员对自燃过程的描述和整车初查,确定起火区域。其次,通过对种种自燃原因的排除,确定该故障的起火点。最后,通过自燃的分析,识别设计、装调缺陷,提出预防方案。     

Self-powered active control applied to a truck cab suspension

A method of active vibration control using regenerated vibration energy, i.e. self-powered active control, applied to the cab suspension of a heavy duty truck. In the proposed system, an electric generator that is installed in the suspension of the chassis regenerates vibration energy and stores it in the condenser. An actuator in the cab suspension achieves active vibration control using the energy stored in the condenser. Numerical simulations and basic experiments demonstrate better isolation performance of the self-powered active vibration control system than that of a passive and a semi-active control.     

Hunting stability analysis of high-speed train bogie under the frame lateral vibration active control

In this paper, we study a multi-objective optimal design of three different frame vibration control configurations and compare their performances in improving the lateral stability of a high-speed train bogie. The existence of the time-delay in the control system and its impact on the bogie hunting stability are also investigated. The continuous time approximation method is used to approximate the time-delay system dynamics and then the root locus curves of the system before and after applying control are depicted. The analysis results show that the three control cases could improve the bogie hunting stability effectively. But the root locus of low- frequency hunting mode of bogie which determinates the system critical speed is different, thus affecting the system stability with the increasing of speed. Based on the stability analysis at different bogie dynamics parameters, the robustness of the control case (1) is the strongest. However, the case (2) is more suitable for the dynamic performance requirements of bogie. For the case (1), the time-delay over 10?ms may lead to instability of the control system which will affect the bogie hunting stability seriously. For the case (2) and (3), the increasing time-delay reduces the hunting stability gradually over the high-speed range. At a certain speed, such as 200?km/h, an appropriate time-delay is favourable to the bogie hunting stability. The mechanism is proposed according to the root locus analysis of time-delay system. At last, the nonlinear bifurcation characteristics of the bogie control system are studied by the numerical integration methods to verify the effects of these active control configurations and the delay on the bogie hunting stability.     

Optimized fuzzy control strategy for a spa hybrid truck

In this paper, an optimized control strategy is proposed for a split parallel hydraulic hybrid truck. The model of the vehicle was simulated in Simulink. According to a global optimization technique, a fuzzy control strategy is developed for the vehicle. This strategy shows flexibility for different drive cycles and a desirable fuel consumption reduction, especially for a low speed drive cycle, which is extracted according to an urban utility vehicle mission.     

某轻型卡车线束插件烧蚀原因分析与改进

本文针对某轻型卡车发动机线束接插件烧蚀问题,通过对可能引起插件烧蚀的各种因素进行分析,找到导致该车型发动机线束插件烧蚀的根本原因,通过对插件的护套结构和端子进行改进,有效的解决了发动机线束接插件烧蚀问题,加强了整车电气系统的安全稳定性,并为以后的设计和类似问题的解决提供了技术参考。     

重型卡车离合操纵系统优化设计

本文以某重卡的离合系统操纵机构为研究对象,计算分析该机构匹配的合理性,并对该车离合操纵机构进行优化,使其满足踏板行程及踏板力要求.