The capacity of a priority intersection

We present simple formulae for the maximum capacity of an intersection of a single stream of minor traffic with a single stream of major (priority) traffic. The method allows for both mixed (nonhomogeneous) vehicle types and for inconsistent driver behaviour in the minor traffic stream. For a realistic class of major headway distributions the capacity is the harmonic mean of the capacities for each individual vehicle type. The formulae include generalisations of Tanner's formula for the cases of inconsistent and/or nonhomogeneous minor vehicles.     

Some Inverse Solutions to an Automobile Path-Tracking Problem with Input Control of Steering and Brakes

An approximate inverse solution for a laterally telescoped automobile is obtained where the two inputs, namely the steering angle and the brake/tractive forces, are determined so as to perform a specified lane change maneuver. The optimal control approach is shown to be useful in obtaining some of the many feasible inverse solutions where the same tracking task is performed with different steering inputs by applying different brake/tractive forces. A comparison is made between the tractive forces required for front and rear drive automobiles when the vehicle is to be accelerated to the same final speed during the same lane-change maneuver.     

高压无气冷喷漆划线车的发展概况和趋向

冷喷漆划线车是道路标线绘制的一种重要设备,按工作原理和结构组成可分为:机械式高压无气冷喷漆划线车、液压式高压无气冷喷漆划线车和气动式高压无气冷喷漆划线车。介绍了上述各种高压无气冷喷漆划线车的结构组成、工作原理、主要特点、应用及发展趋向。     

多孔无桥台斜腿刚架桥斜腿倾角优化研究

多孔无桥台斜腿刚架桥是一种高次超静定结构,结构优化潜力较大。结合具体工程实践,根据不同的荷载组合,从结构的控制截面内力和位移两个方面对斜腿倾角进行了优化分析。研究结果表明:多孔无桥台斜腿刚架桥与拱桥的连拱情况有相似之处,斜腿倾角在45°~55°较为合适。     

Vehicle dynamics integrated control for four-wheel-distributed steering and four-wheel-distributed traction/braking systems

In this article, vehicle dynamics integrated control algorithm using an on-line non-linear optimization method is proposed for 4-wheel-distributed steering and 4-wheel-distributed traction/braking systems. The proposed distribution algorithm minimizes work load of each tire, which is controlled to become the same value. The global optimality of the convergent solution of the recursive algorithm can be proved by extension to convex problems. This implies that theoretical limited performance of vehicle dynamics integrated control is clarified. Furthermore, the effect of this vehicle dynamics control for the 4-wheel-distributed steering and 4-wheel-distributed traction/braking systems is demonstrated by simulation to compare with the combination of the various actuators.     

汽车动力传动系弯曲振动及减振措施

本文建立了动力传动系弯曲振动的理论模型，运用该模型可以讨论传动轴，变速器输出轴结构参数、中间支承的刚度，手制动器的位置等对动力传动系弯曲振动的影响。还运用理论模型对轻型车、厢式车以及大客车的动力传动系弯曲振动进行了分析，提出了减振措施，解决了上述车型车身振动严重的问题。     

悬索桥主缆新型防护涂装系统的应用

广东虎门大桥悬索桥主缆采用了一种有别于传统防腐观念（阴极保护）的新型主缆防护方法，该防护系统选用的聚氨酯涂料ＭａｘｉＦｌｅｘ具有极好的与钢铁粘结能力、很大的延伸率、较小的渗透率和较小的变形性，可对主缆起到很强的防护作用。介绍了该防护系统的构思、物理性能技术参数、防护系统的组成及涂装工艺。     

Economic and commercial considerations affecting the maritime transportation of tropical produce

This paper discusses the pattern of sea transport and loading in the ECAP and ESCAP areas, particularly the bulk trades in such commodities as sawn hardwood, plywood and rubber. The effects of port development and organization are examined, especially the difficulties of instituting bulk services and containerization in an area with a fragmented pattern of trade.