基于概率转换规则的供应链自动协调

为增强供应链多主体系统协调的高效性、透明性和目标协同性,在分析主体的信念、意图与策略空间映射关系基础上,提出了供应链主体自动协调的概率转换规则.以仿射变换规则作为概率转换规则,实现了协调主体的策略空间变换、交集生成和协调过程引导.算例的协调过程和结果表明,该方法可行有效.     

根据柴油机油底壳滤网上的异物来定位柴油机故障

根据柴油机油底壳滤网上的异物来判断柴油机的故障所在，可以大大缩短检修时间，提高柴油机的检修效率。     

美国荣耀号游轮——最大的一艘悬挂美国国旗的游轮

280米长的美国荣耀号游轮是由德国Lloyd Werft Bremerhaven船厂最新建造的。这艘游轮的建造过程可谓一波三折。其最早的船东由于破产使得建造工作中断。直到美国总统布什特许给予该游轮琼斯法案的赦免权（注：该法案要求美国国内货物应由美国籍的船东、水手及美国建造的船舶承运），Norwegian Cruise Lines（NCL）公司决定收购未完工的船体，并转运到德国Lloyd Werft Bremerhaven船厂进行建造。     

装船机滚筒温度无线检测

神华天津煤码头装船机长期处于连续运行状态，由于振动和长时间运行等原因，有可能会导致皮带机滚筒出现不平衡、不对中、磨损等机械故障。这些故障的一个共同的先期特征是滚筒轴承温度升高，进而导致皮带机滚筒轴承座和滚筒轴承损坏，如果不能及时发现和处理，就有可能由于滚筒温升过高而引燃胶带，造成重大事故。为避免上述问题的发生，码头公司加强了日常点检维护，设有专门的皮带机巡视人员，但码头装船机滚筒数量众多，且安装位置险峻，很多关键点以人工的方式很难检查，所以不能从根本上避免故障的发生。基于以上原因，于2008年首先在1号装船机上安装了滚筒无线测温系统。     

基于Vague集的路堑边坡设计方案的优选

介绍了Vague集的基本概念和Vague集多准则评价模糊决策问题,构造了其记分函数,并将该决策理论应用于路堑边坡设计方案的优选问题中.分析了影响方案优选的基本因素,给出了工程造价、边坡稳定效果、占地、施工环境、施工难度和弃方量等评价指标,阐述了各备选方案的Vague集表达方法,为路堑边坡设计方案的选择提供了新的思路.最...     

单片机在船舶主机转速测量中的应用研究

本文研究以单片机为核心,以磁电式转速传感器做探头的转速测量装置.介绍了主机转速测量装置的技术要求、系统组成及转速信号的获取原理.给出了转速信号处理电路及工作原理,有着广泛的应用场合和使用价值.     

城市轨道交通站点数据链客流预测方法研究

城市轨道交通客流预测数据是城市轨道交通设计与运营的重要依据与基础,在总结分析我国城市轨道交通客流预测经验及研究成果的基础上,提出基于城市土地利用法的站点数据链客流预测方法,系统介绍该预测方法的理论体系,并以杭州地铁4号线为例,验证站点数据链客流预测方法的科学性与合理性,以期使该预测方法在客流预测与校核中具有指导意义。     

Fuzzy sliding mode control method for vertical motion of autonomous underwater gliders北大核心CSCD

［Objective］This paper proposes a fuzzy sliding mode controller based on T-S fuzzy logic for the vertical plane motion control of an autonomous underwater glider (AUG) with limited actuator capability. ［Methods］In the fuzzy sliding mode controller, the fuzzy switching rate is used to replace the switching rate in the fixed time controller to effectively suppress buffeting. The fuzzy switching rate is obtained by fitting the switching rate of the fixed time controller with T-S fuzzy rules. Based on the limited capabilities of AUG actuators, a saturation auxiliary system is designed to improve the actuator saturation effect. Finally, the performance of the system is verified by Lyapunov stability analysis and numerical simulation. ［Results］The results show that the AUG under the fuzzy sliding mode controller and the saturation auxiliary system can converge in finite time. The effectiveness of the fuzzy sliding mode controller and the saturation auxiliary system are verified by numerical simulation. ［Conclusions］By making comparisons with the fixed-time controller, it is verified that the two controllers have similar control performance, and the buffeting of the fuzzy sliding mode controller is lesser. © 2022 Journal of Clinical Hepatology. All rights reserved.     

Coordinated collision avoidance for connected vehicles using relative kinetic energy density

Vehicular collision often leads to serious casualties and traffic congestion, and the consequences are worse for multiple-vehicle collision. Many previous works on collision avoidance have only focused on the case for two consecutive vehicles using on-board sensors, which ignored the influence on upstream traffic flow. This paper proposes a novel coordinated collision avoidance (CCA) strategy for connected vehicles, which has potential to avoid collision and smooth the braking behaviors of multiple vehicles, leading to an improvement of traffic smoothness. Specifically, model predictive control (MPC) framework is used to formulate the CCA into an optimization problem, where the objective is to minimize the total relative kinetic energy density (RKED) among connected vehicles. Monte Carlo simulations are used to demonstrate the effectiveness of proposed CCA strategy by comparison with other two strategies. Among all the three control strategies, the RKED based control strategy shows the best performance of collision avoidance, including the best crash prevention rates (99.2 % on dry asphalt road and 90.5 % on wet asphalt road) and the best control of distance headways between vehicles.     

韧性环氧树脂结构胶在汽车上的应用

某车型顶盖和侧围激光钎焊连接后出现顶盖行李支架与侧围无法焊接问题。通过对某2款环氧树脂结构胶的力学性能进行试验测试对比,分析某款韧性环氧树脂结构胶的性能优势,并结合仿真分析和实车破坏进行验证,结果表明此韧性环氧树脂结构胶可成功实现某车型顶盖行李支架与侧围的连接,为结构胶在汽车车身上的应用提供一定的理论依据。