大连地铁2号线小半径曲线隧道盾构单井口始发技术研究

针对盾构在大连地铁2号线西安路站至交通大学站区间小半径曲线隧道单井口的复杂始发条件,从进度、成本、可行性等方面对盾构分体始发和整体始发方案进行比选,最终确定采用整体始发方案。通过自制皮带机和管片小车,从始发方向和盾构掘进姿态调整等方面进行控制,解决了整体始发阶段出渣、管片运输和盾构姿态控制的难题,实现了小半径曲线隧道上盾构单井口整体始发。     

散货船主要要素交互设计程序系统

本文论述一个用于初始设计阶段确定散货船主要要素的计算机程序系统。输入载重量、货舱容积、设计航速、续航力和船员人数以及主机参数值后,经过约一小时的人机对话交互设计过程,可以取得合理的主要要素基本方案,然后通过快速的多方案比较探求更满意的方案。 本文首先阐述系统的设计指导思想和技术处理方法,而后对主要工作内容作简要的介绍,进一步说明系统的设计特点。     

复杂产品制造企业管理信息化平台关键技术研究

从复杂产品的生产管理特点出发,提出了与CAD/CAPP/PDM集成的以实现动态生产管理为目标的企业管理信息化平台方案,并对方案实现的技术路线及技术关键进行了阐述.     

可编程逻辑控制器在船舶主机遥控系统中的应用

介绍可编程逻辑控制器的功能和优势;重点介绍基于可编程控制器的船舶主机遥控系统设计,并编写了工作流程图,分别对各个模块单元进行说明。最后给出几点体会。     

基于兴波理论与阻力图谱资料的高速双体船阻力预报方法

在原苏联"方尾图谱"重分析和改进的基础上[1],基于兴波阻力的薄船理论与船模试验数据的结合,提出用兰金(Rankine)体的波幅函数代替实际船型的波幅函数,以确定双体船片体间的阻力干扰因子,从而计算得到双体船的兴波阻力.整个计算过程直接使用Microsoft Excel,对新方尾单体船电子阻力数据执行查值和进行主要影响系数的修正计算,粘性影响修正与总阻力计算;进行不同尺度的快速性方案比较,以及确定高速单体船或高速双体船的总阻力与有效功率曲线.通过WP60穿浪双体船一算例与船模试验结果的比较表明,该方法是一种实用、高效、灵活、便捷和可靠的计算方法.     

An analysis of the effects of French vehicle inspection program and grant for scrappage on household vehicle transaction

The French government has implemented a periodical vehicle inspection program, which aims at maintaining proper functioning of the vehicle and ensuring the emissions control systems installed on the vehicle work properly. Also, an incentive program for scrapping old vehicles was introduced in 1994 through 1996 to promote the replacement of those vehicles with higher emissions by newer vehicles with lower emissions. A hazard-based duration model of household vehicle transaction behavior has been developed in this study to examine the effects of the inspection program and the grant for scrappage on vehicle transaction timing. The model is developed as a competing risks model assuming the following three types of competing risks: replacing one of the vehicles in the household fleet, disposing of one vehicle in the fleet, and acquiring one vehicle to add to the fleet. The empirical analysis is carried out using the panel data of French households' vehicle ownership from 1984 to 1998, obtained by the panel survey called Parc-Auto, which has been conducted by a French marketing firm, SOFRES, since 1976. The long panel observation period facilitates the introduction of macro-economic indicators into the model, enabling the analysis to distinguish the effects of policy measures from macro-economic factors. The empirical results indicate that the expected vehicle holding duration becomes 1.3 years longer under the inspection program than before the program commenced, given that the vehicle is replaced by another vehicle at the end of the holding duration; and that the conditional probability of replacing a vehicle aged 10 years and over becomes 1.2 times higher, and the average holding duration becomes shorter by 3.3 years, when the grant for scrappage is available.     

局部桩基础和复合地基上的土石坝三维分析

结合太仓市第二水厂蓄淡避咸水库大坝的地基加固处理工程,针对桩基础和桩长纵向渐变复合地基,应用三维快速拉格朗日法对较大规模群桩进行计算,分析了不同桩径、桩距和桩长复合地基对坝体和坝基的应力、位移的影响。     

Unwedge程序在雪峰山隧道围岩块体稳定性分析中的应用

Unwedge程序是加拿大Toronto大学E．Hoek等依据石根华块体理论开发研制的，对该程序的基本原理作了介绍，并将其应用于雪峰山隧道的块体稳定性分析中。研究表明，该程序具有较好的实际应用价值。     

A reliability‐based network design problem

This paper presents a reliability‐based network design problem. A network reliability concept is embedded into the continuous network design problem in which travelers' route choice behavior follows the stochastic user equilibrium assumption. A new capacity‐reliability index is introduced to measure the probability that all of the network links are operated below their capacities when serving different traffic patterns deviating from the average condition. The reliability‐based network design problem is formulated as a bi‐level program in which the lower level sub‐program is the probit‐based stochastic user equilibrium problem and the upper level sub‐program is the maximization of the new capacity reliability index. The lower level sub‐program is solved by a variant of the method of successive averages using the exponential average to represent the learning process of network users on a daily basis that results in the daily variation of traffic‐flow pattern, and Monte Carlo stochastic loading. The upper level sub‐program is tackled by means of genetic algorithms. A numerical example is used to demonstrate the concept of the proposed framework.     

以单片机为核心的司控器检测系统

通过对司机控制器试验参数的分析,介绍用单片机实现的司机控制器试验参数全自动测试系统,并详细地分析了该系统的结构、硬件组成及系统功能。