JLY6120SCK型双层城市客车设计

针对JLY6120SCK型双层城市客车,根据城市公交的运营特点,分别从双层客车底盘及发动机选型、外形设计、车厢内部布置设计、内饰设计及其他细节设计等方面进行阐述.     

8 m城市客车空气悬架系统开发

根据不同型式的空气悬架的结构特点,确定应用于8m城市客车的空气悬架方案,介绍空气悬架元件的设计方法.     

汽车保险杠的薄壁化设计

保险杠薄壁化设计具有降低零件重量、减少制造能耗、提高生产节拍等多方面优势,其所选用的改性聚丙烯材料须具备高流动、高冲击、高强度和高刚性的特点。CAE模拟明确了薄壁设计对保险杠系统模态、疲劳特性、静态下沉量及系统刚度的影响,为汽车保险杠薄壁化设计提供参考。     

降低传动系统冲击载荷的一种有效方法

研究了半轴、传动轴扭转刚度对传动系冲击载荷最大值的影响,得出了半轴扭转刚度与传动系冲击载荷最大值之间的函数关系,指出降低半轴扭转刚度是减小传动系冲击载荷最大值,提高传动系可靠性的有效方法。研制了新型非调质刚半轴,并将其与原调质刚半轴进行了对比试验。结果表明,将非调质钢半轴杆径从60 mm减小到58 mm,其静扭刚度及疲劳寿命均可满足技术要求,而扭转刚度较原调质刚半轴略有降低,有利于整个传动系降低冲击载荷。     

砂岩隧道洞渣集料在宜巴高速公路中的应用

为探讨宜巴太阳岭砂岩洞渣用作混凝土集料的可行性,对母岩抗压饱和强度、物理化学成分、碱活性进行分析,采用简化砂、石联产工艺生产出砂岩碎石、机制砂并对其基本技术指标进行检测.研究表明,该砂岩洞渣为硬质砂岩,加工的碎石、机制砂可满足混凝土集料技术指标要求.以宜巴高速公路为依托,成功地将砂岩集料配制的混凝土应用于隧道二衬与桥梁桩基、墩柱.     

玉柴YC6L在上海公交中的应用与优化

采集上海市郊与市区结合的城市客车路谱工况,记录实际道路行驶大量数据并对其进行分析;提炼出路谱信息,应用到Cruise整车模拟计算中,对YC6L发动机性能等参数进行优化。     

Modeling and control of the pulley buffer system of arresting cable for shipboard aircraft based on magneto-rheological fluid

Taking the MK7-3 of USA hydraulic buffer arresting device as the research subject, the dynamical model for the shipboard aircraft arresting system is established, and the magneto-rheological (MR) damper is applied to pulley shock absorbers for shipboard aircraft block system. Due to the effect of the MR damper has not been known completely and so far MR damper model has not been defined, we use a set of characteristic test of the MR damper, through the process of parameters identification, to establish the dynamical model for the MR damper based on the Bingham plastic model. Then, the fuzzy control rules are designed, the buffer control for the pulley buffer of shipboard aircrafts is completed in touchdown moment based on MR technology. Compared with blocking device of hydraulic pulley buffer in the same condition, the simulations results show that the proposed MR pulley buffer can effectively recognize the impact energy for shipboard block system and reduce the pull peak of arresting cable. It improves significantly safety during landing of the air vehicles and lowers the risk of accidents.     

An advanced risk analysis approach for container port safety evaluation

Risk analysis in seaports plays an increasingly important role in ensuring port operation reliability, maritime transportation safety and supply chain distribution resilience. However, the task is not straightforward given the challenges, including that port safety is affected by multiple factors related to design, installation, operation and maintenance and that traditional risk assessment methods such as quantitative risk analysis cannot sufficiently address uncertainty in failure data. This paper develops an advanced Failure Mode and Effects Analysis (FMEA) approach through incorporating Fuzzy Rule-Based Bayesian Networks (FRBN) to evaluate the criticality of the hazardous events (HEs) in a container terminal. The rational use of the Degrees of Belief (DoB) in a fuzzy rule base (FRB) facilitates the implementation of the new method in Container Terminal Risk Evaluation (CTRE) in practice. Compared to conventional FMEA methods, the new approach integrates FRB and BN in a complementary manner, in which the former provides a realistic and flexible way to describe input failure information while the latter allows easy updating of risk estimation results and facilitates real-time safety evaluation and dynamic risk-based decision support in container terminals. The proposed approach can also be tailored for wider application in other engineering and management systems, especially when instant risk ranking is required by the stakeholders to measure, predict and improve their system safety and reliability performance.     

悬臂式可变信息情报板简约安装设计探讨

文章探讨了悬臂式新增龙门架侧可变信息情报板简约安装支架结构,通过建立装配模型,寻找最优结构强度设计,通过零件在模型上的匹配效果,确定实施方案的可行性。利用现有龙门架,节省立柱材料,减少占地空间,实现新增情报板外形美观、结构轻巧、可视性强、景观效果和谐。     

客车辅助制动性能试验研究

介绍客车辅助制动系统的分类、作用及原理。以某型客车为例,依据相关标准,采用减速度测定试验方法来测试样车的辅助制动性能。结果表明,缓速器制动的制动效能要优于发动机制动和发动机排气制动;采用发动机制动、发动机排气制动与缓速器联合工作的方式,能够有效地改善高速行车时的制动效能。