电动汽车动力电池热失控过程分析及预警机制设计

文章通过实验数据对热失控发生的过程进行分析,提取出关键的信号特征。设计出一套全面完整的热失控预警系统,并总结出多个报警条件,避免出现故障的误报及漏报的情况。最后介绍了热失控预警后整车及大数据的应对措施。     

真空预压中地下水位变化的研究

分析真空预压中地下水位变化的研究现状,指出目前研究存在的问题。在土水势概念的基础上,以工程应用为目的,定义了地下水位。从真空预压加固地基的机理出发,分析了不同水流边界和不同渗透性的地基土在真空预压处理中地下水位变化的可能情况。通过分析指出,真空预压过程中,地下水位不可能下降,地下水位不变和上升是可能的;认为真空预压兼有降水预压的双重效果是不合理的。在此基础上进一步总结了真空预压法的加固机理。最后探讨了真空预压中地下水位的量测方法。     

PMM tests in a circulating water channel and nonlinear analysis

As a result of frequent marine disasters leading to the loss of human life and pollution of vast areas of the ocean, ship manoeuvrability has become a very important characteristic of ship design. Among several recent experimental techniques to determine ship manoeuvrability, the most popular is captive model testing using a planar motion mechanism (PMM). This article describes some tests, analyses, and results of PMM tests in a circulating water channel (CWC) using a model of a training ship. The hydrodynamic forces and moments acting on a model of the training ship Shioji Maru in pure yawing motion were measured, and hydrodynamic derivatives were obtained using two different methods of analysis: singular value decomposition (a least-squares fit method) and Fourier analysis. Derivatives obtained from the tests were used to simulate the turning trajectory of the actual ship, and these were compared with the results of sea trials. The results indicate that both methods of analysis yield fairly similar derivatives. The simulation results were also found to be a close match with the trial results. Received: February 7, 2002 / Accepted: May 14, 2002 Address correspondence to: K. Shoji (shoji@ipc.tosho-u.ac.jp)     

从"亚平"轮事故谈海上安全应急信息共享机制的建立

为切实保障海洋公共交通安全,建立海上安全应急信息共享机制已经迫在眉睫。本文认为,要打破“信息孤岛”现象,建立相互依存、有机联系、实用高效的海上安全应急信息共享机制,就必须加强四个系统建设,包括建设高效的指挥系统、密切的协同系统、完备的技术系统、长效的反馈系统。同时,本文提出,要发挥海事部门在海上安全应急信息共享机制中的主导作用,切实保障海洋公共交通安全。     

高切坡失稳动力机理研究

工程开挖形成的高切坡,由于卸荷作用,往往会出现卸荷裂缝,潜滑体在重力作用下会向下蠕动,致使其中部固锁段受到挤压而储存了弹性应变能,当固锁段存储的剪切应变能达到岩体的抗剪强度时,滑体就会失稳运动。运用能量守恒定律及动力学有关理论得出了滑体的启程速度、滑动速度和滑行距离方程。以2001年5月1日发生在重庆武隆的高切坡失稳为例进行了验证,并得到了好的成效,为确定滑体的致灾能力及致灾范围提供了依据,有利于更好地防灾减灾。     

生态环境项目建设监理的机制研究

实行生态工程建设监理制,是加强生态建设的必由之路。该文针对现行生态工程监理机制中存在的问题,提出了搞好生态工程建设监理的一些对策和建议。     

太平湖大桥铜陵岸边坡破坏机理分析与防护

文章在分析太平湖大桥铜陵岸边坡工程地质特征、稳定性影响因素及边坡变形破坏机理的基础上,依据相关工程设计规范和原则分析计算出该边坡岩体结构面检算指标、地震与正常状态下的滑坡推力以及各断面预应力锚索锚固长度。介绍了铜陵岸边坡的预应力锚索、钢筋锚杆、钢筋混凝土框架、地表与仰斜排水等工程设计及防护结构的基本参数。     

Control method of three-level neutral-point-clamped inverter based on voltage vector diagram partition

A new modulation approach was presented for the control of neutral-point (NP) voltage variation in the three-level NP-clamped voltage source inverter, and the average NP current model was established based on vector diagram partition. Thus, theory base was built for balancing control of NP potential. Theoretical analysis and experimental results indicate that the proposed method for NP balancing control vector synthesizing concept based can make the average NP current zero, and do not influence NP potential within every sample period. The effectiveness of proposed research approach was verified by simulative and experimental results.     

高职院校单独招生改革试点工作的实践探索

按照教育部提出的“学校负责、自我约束、行政监督”的工作原则,本文结合我校2008年单独招生工作,以建立运行机制、监督机制和录取机制为切入点,在探索引导普通高中毕业生向优质高等职业院校合理分流、多样化选拔录取机制方面做了有效实践和探索。     

工程招投标的博弈论分析

从博弈论的角度分析招投标的理论基础,指出招投标这种制度能够起到择优选择的作用,但同时指出招投标制度的良好运行是建立在几个假设条件之上的,并为招投标制度良好运行提出了建议与措施。