重型汽车发动机润滑油的合理更换

重型汽车发动机在用润滑油的更换合理与否,直接影响着发动机的使用寿命,而润滑油消耗的多少又与企业经济效益相关.针对我国重型汽车发动机更换在用润滑油过程中存在着不尽合理的现状,本文进行了讨论.     

一类运输问题的数学模型及算法研究

研究一类运输问题的优化方法,分别用Go矩阵和Return矩阵描述卡车的双向调度方案,建立了一个综合规划的数学模型,并以总运量和出动卡车的数量最小为目标,以品位限制、供需限制、车辆容量限制等为约束条件,以分步优化、逐层突破的方法给出了模型的优化解法.     

A discrete-event model to simulate the effect of truck bunching due to payload variance on cycle time,hauled mine materials and fuel consumption

Data collected from truck payload management systems at various surface mines shows that the payload variance is significant and must be considered in analysing the mine productivity,energy consumption,greenhouse gas emissions and associated cost.Payload variance causes significant differences in gross vehicle weights.Heavily loaded trucks travel slower up ramps than lightly loaded trucks.Faster trucks are slowed by the presence of slower trucks,resulting in‘bunching’,production losses and increasing fuel consumptions.This paper simulates the truck bunching phenomena in large surface mines to improve truck and shovel systems’efficiency and minimise fuel consumption.The study concentrated on completing a practical simulation model based on a discrete event method which is most commonly used in this field of research in other industries.The simulation model has been validated by a dataset collected from a large surface mine in Arizona state,USA.The results have shown that there is a good agreement between the actual and estimated values of investigated parameters.     

邮政运输中的信息收集与处理研究

为了掌握邮政运输中邮车的收发班和准点运行情况 ,提高邮政运输生产率 ,需要运用计算机对邮运时限和收发班进行管理。本文作者讨论了在邮运时限及收发班管理信息系统中如何利用所采集的信息来判别邮车运行路线的问题 ,同时提出了用程序处理信息的方法     

Application of multinomial and ordinal logistic regression to model injury severity of truck crashes,using violation and crash data

Railway Engineering Science - In 2016 alone, around 4000 people died in crashes involving trucks in the USA, with 21% of these fatalities involving only single-unit trucks. Much research has...     

Monitoring dispatch information system of trucks and shovels in an open pit based on GIS/GPS/GPRS

Using GIS, GPS and GPRS, an intelligent monitoring and dispatch system of trucks and shovels in an open pit has been designed and developed. The system can monitor and dispatch open-pit trucks and shovels and play back their historical paths. An intelligent data algorithm is proposed in a practical application. The algorithm can count the times of deliveries of trucks and loadings of shovels. Experiments on real scenes show that the performance of this system is stable and can satisfy production standards in open pits.     

高家花园大桥挠度长期监测数据分析

通过对高家花园大桥长期监测数据的分析,掌握大桥挠度与温度、车辆荷载等作用的变化规律,并初步确定大桥挠度的变化规律。对桥梁结构状态监测系统采集的温度、车流量及重车、挠度监测数据采用时间序列相关分析和小波分析,重点研究了桥梁跨中处挠度变化主要与温度、车辆荷载之间的关系。分析结果表明,桥梁跨中处挠度与温度具有较好的相关性,而挠度的波动主要是由重车引起的。分析结果为高家花园大桥和类似连续刚构桥的安全状态评估提供了技术支持。     

可控硅串级调速法在起重设备上的工作原理与应用

交流电机可控硅串级调速方法适用于各种起重设备的大车、小车、回转、变幅和起升各机构,具有无级调速范围大、调速机械特性硬和节能的优点。     

高原及山区汽车转向操纵系统适应性的模糊综合评价

本文简述了我省汽车使用环境及车辆适应性的评价问题。介绍了一种建立在模糊论基础上的综合评价方法,以EQ140和CA141载货汽车为例,利用模糊统计方法获得隶属函数,得到了两车转向操纵系统适应性的评价结果。     

车用柴油机进气系统的研究进展

本文根据资料概述了车用柴油机进气管和进气道结构形式的发展,并就进气系统的研究方法予以了评述。     

爬坡车道长度的确定

爬坡车道的设置可显著改善陡坡路段的行车条件。文中根据路线允许最低车速和载重车的加减速行程曲线，用图解法确定爬坡车道的长度。     

汽车运输露天矿电铲、汽车匹配关系最优化问题的探讨

在汽车运输露天矿的生产管理中,经常遇到汽车的合理调配问题。怎样调配才能使产量最高;怎样调配才能使成本最低;怎样调配才能使各水平产量均衡;某台电铲故障以后应怎样重新调配汽车;一些汽车故障以后怎样重新调配。传统的调配方法为经验决策,很难达到最优结果。本文,以我国某露天矿的实测数据为依据,利用计算机模拟方法对单台电铲的采装、运输、排土工艺环节的能力匹配关系进行研究,得出了不同远距条件下,工作面产量、电铲有效时间利用率、汽车有效时间利用率三者随配车数目的增减而变化的规律。利用模拟结果,根据露天矿当前的生产目标,可以方便地解决汽车最优调配问题,从而改进露天生产理管,提高经济效益。     

客货混行信号交叉口货车专用左转车道设置方法

为了寻求客货混行交叉口货车专用左转车道的设置方法,依据效率原则,对比分析了设置货车专用左转车道前后的饱和释放流率,给出了关于饱和流率修正系数的货车专用左转车道设置临界条件。针对实际情况,结合仿真手段给出了不同转弯半径和混行比例条件下修正系数的两类计算方法。最后依据交叉口的几何特性,给出左转车道右置的几何临界条件,可以为客货混行交叉口货车专用左转车道设置提供理论依据。     

电铲—汽车装运系统的排队模型Ⅰ

本文把电铲—汽车装运系统看成服务时间为爱尔朗分布的有限、循环排队系统,建立了汽车在排卸点不出现排队现象情况下的装运系统的数学模型,编制了求解该模型的计算程序,并通过实例来说明如何确定最优的车铲比及装运系统的生产能力。     

基于主动横向稳定杆的自卸汽车作业稳定性

针对传统自卸汽车普遍存在作业稳定性较差的问题,通过建立具有单侧主动横向稳定杆的空气悬架自卸汽车功能虚拟样机模型,并利用联合仿真技术,分别研究了在不同控制方式下的被动横向稳定杆及单侧主动横向稳定杆对空气悬架自卸汽车作业稳定性的影响。通过对比分析,得出单侧主动横向稳定杆系统显著地提高了空气悬架自卸汽车卸载时的作业稳定性。     

混凝土泵车臂架系统建模与仿真分析

根据37m混凝土泵车臂架液压系统工作原理,基于AMESim软件建立臂架系统仿真模型。对泵车臂架在水平工况下的动态特性进行仿真试验,将仿真结果与实测数据进行对比分析,验证了仿真模型的合理性。     

Optimization model of truck flow at open-pit mines and standards for feasibility test

In order to increase production efficiency at open-pit mines, on the basis of linear programming, a practical mathematical model for optimizing truck flow was developed, which improved the traditional fixed manual schedule method. The model has advantages from linear programming and objective programming, makes most handling points working at full capacity and keeps an optimized ratio between trucks and excavators. For ensuring feasibility of the model in practical production, four standards for feasibility test were proposed. The model satisfied all the standards. The application in a large scale open-pit iron mine indicated that the model reduced the number of required trucks by 10% compared with the fixed manual schedule method.     

重车过桥的验算方法及加固与管理措施

介绍了超重车辆过桥的验算方法与加固措施,并提出了有产的管理措施。     

汽车钢板弹簧CAD

介绍对矿用自卸汽车钢板弹簧设计中的一些问题的处理及板簧ＣＡＤ系统的主要功能及其实现。     

Development of a multi-layer perceptron artificial neural network model to determine haul trucks energy consumption

The mining industry annually consumes trillions of British thermal units of energy,a large part of which is saveable.Diesel fuel is a significant source of energy in surface mining operations and haul trucks are the major users of this energy source.Cross vehicle weight,truck velocity and total resistance have been recognised as the key parameters affecting the fuel consumption.In this paper,an artificial neural network model was developed to predict the fuel consumption of haul trucks in surface mines based on the gross vehicle weight,truck velocity and total resistance.The network was trained and tested using real data collected from a surface mining operation.The results indicate that the artificial neural network modelling can accurately predict haul truck fuel consumption based on the values of the haulage parameters considered in this study.