Longitudinal Tire Dynamics

This article begins with a brief review of the traditional concept of lateral relaxation length. The review illustrates that this concept yields a useful approximation which can be used with semi-empirical tire models which assume lateral forces are a function of steady-state slip angles. The article then presents an analogous derivation for longitudinal slip. Like its lateral counterpart, the derivation yields an approximation for transient longitudinal slip which can be used with tire models which assume longitudinal forces are a function of steady-state longitudinal slip. It is shown that, like the relaxation-length-based lateral slip angle, this formulation for longitudinal slip yields the ability to compute shear forces at the tire/road interface for either high or low speed applications, a necessary feature of simulations which support human in the loop driving simulation. Like traditional kinematically-based longitudinal slip, the transient formulation presented here is coupled with the wheel spin equation, and it shares the characteristic that it is very stiff compared to the equations of vehicle motion. This characteristic is a challenge impeding the real-time calculations required for driving simulation. The paper shows that local linearization of the wheel spin equations coupled with analytical solutions of the transient longitudinal slip formulation provide the basis for both insight into the longitudinal dynamics of the tire and for integrating the model in real-time.     

Cost assessment for abyssal seafloor waste isolation

We develop an integrated model for estimating the internal cost of abyssal seafloor waste isolation. The model captures the major economic, engineering, geographic and social factors that influence the management cost for sewage sludge and municipal incinerator ash. Considering five representative metropolitan areas and five proposed abyssal study sites, we apply this model to produce cost estimates for four deep-ocean waste delivery system concepts. The results show that the unit cost depends primarily on regional waste volume, the marine delivery system and transportation distance. Based on available data, the abyssal ocean option may be competitive with present land-based disposal costs in New York City. The option is less competitive in other metropolitan areas.     

宋丽关系与密州板桥镇

关于宋朝与高丽王朝的关系史,很多学者已作了大量的研究,但多是集中在两个国家总体上的政治经济文化交流,从地方史角度出发的不多,即使有也大多是对两浙地区比如明州(今浙江宁波)和杭州等地的宋丽关系史的考察,研究山东胶州地区中韩关系的则很少.对于山东胶州的问题也有人研究,李晓先生曾在<海交史研究>(1985年第1期)上发表过<山东胶州港兴衰问题初探>,介绍了胶州港在北宋前、宋金元初及明清两代的兴衰过程,不过,重点是在港口历史沿革,不在宋丽关系.所以本文拟以胶州(即宋朝历史上的密州板桥镇)为中心对宋丽关系作一初步探索,以就正于诸位前辈.     

加肋凸型锥—环—柱结合壳模型试验研究

加肋锥—环—柱结合壳是潜艇耐压艇体柱壳与锥壳连接的一种优越的结构形式,它能大幅度降低结合部的应力峰值。该文通过两个精车模型和三个大比例钢制焊接模型的静水外压试验,研究了加肋凸型锥—环—柱结合壳模型的应力分布和组合壳的极限承载能力。通过对应力分布和模型破坏模式的分析,指出加肋凸型锥—环—柱结合壳的力学特性。     

基于响应面法的汽车转向系统可靠性优化

针对结构参数的不确定性会导致确定性优化结果不可靠的问题,提出一种将可靠性分析与优化技术相结合的转向系统可靠性优化方法。该方法基于响应面方法构建转向系统优化近似模型,以1阶固有频率为约束,总质量为优化目标对转向系统进行可靠性优化。结果表明,采用该方法对汽车转向系统进行优化,减小了系统质量,提高系统的1阶固有频率,避免怠速共振,达到可靠性优化的目的。     

基于虚拟仿真技术的计算机网络实验室的构建

分析了高校计算机网络实验教学的现状,结合我校实际情况,构建了基于虚拟仿真技术的计算机网络实验室。详细探讨了实验室软硬件条件和教学内容的建设,进一步完善了实验教学体系。     

风电安装平台坐底稳性评估技术

风电安装平台是专门用来在近海、潮间带地区进行风力发电机组安装的专用功能船舶。该文结合"辽河一号"风电安装平台坐底安装,一船多用的典型特点,对其坐底稳性评估技术进行研究。通过编制程序,可以快速实现环境载荷计算,优选波浪参数与地质条件的合理匹配,为工程作业提供必要的技术参考。     

转臂式轴箱定位装置等效刚度计算与分析

文章从能量守恒定律出发，结合转臂式轴箱定位装置的结构特点，通过分析其受力状况和运动几何关系，在充分合理简化的基础上，推导出通用的转臂式轴箱定位装置的垂向、纵向和横向等效刚度计算公式，并对我国典型动车组的转臂式轴箱等效定位刚度进行了计算。     

Benefits and challenges of controlling a LED AFS (adaptive front-lighting system) using fuzzy logic

The vehicular illumination system has undergone considerable technological advances in recent decades such as the use of a Light Emitting Diode (LED) Adaptive Front-lighting System (AFS), which represents an industry breakthrough in lighting technology and is rapidly becoming one of the most important innovative technologies around the world in the lighting community. This paper presents AFS control alternatives using fuzzy logic (types 1 and 2) to determine its operating parameters taking into consideration the road conditions in the state of São Paulo (Brazil). Fuzzy logic is a well-known extension of the conventional (Boolean) logic that enables the treatment of uncertainty present in the information through the definition of intermediary membership values between the “completely true” and the “completely false”. This technique or modeling strategy is particularly important when a multi-parameter decision must be taken or the decisions are based on the human knowledge. The results show the potential of the methodology proposed and its suitability for light control providing safer nighttime driving.     

计算机联锁模拟培训系统

主要介绍了计算机联锁培训系统平台的研制开发。系统依靠计算机技术、控制技术、网络技术，完全模拟计算机联锁设备的显示界面与操作方法，做到与现实设备操作一致，使操作人员如同亲临现场，从而达到使电务工作者能进行培训、演练和开发的目的。