航空电动静液作动器技术浅谈

随着飞机的舵面控制系统的要求进一步提高,功率电传作动技术是多电飞机区别于传统飞机的关键技术之一,功率电传作动系统的应用将取消飞机上原有的分散液压源和气压源,而采用电动静液作动器作为传动部件。本文阐述了航空电动静液作动器的技术发展概况,介绍了航空电动静液作动器的系统组成,分析比较了EHA在三种不同原理及特点,总结了EHA在飞机应用中的优势。     

军用工程机械电传动系统试验体系研究

鉴于目前军用工程机械领域还缺少完善的电传动系统试验评价体系,难以对电传动系统性能做出全面、客观的评价,影响电传动系统在军用工程机械领域的应用和发展,通过分析军用工程机械电传动系统的组成和应用环境,提出基于背靠背试验原理满足军用工程机械电传动系统低速大转矩、高速行驶特性的试验台的构建方法,并基于该试验台开展了军用工程机械电传动系统试验研究,同时结合相关工程机械国军标及其他领域电传动系统国标的分析,给出了较为完整的军用工程机械电传动系统试验项目及试验分类等试验体系要求,以切实保证军用工程机械电传动系统的质量。     

装载机不同电驱动构型的能耗仿真分析

电驱动是装载机等工程机械传动系统未来发展的重要方向,在对比电驱箱、电驱桥和轮边驱动等3种不同电驱动传动系统构型的基础上,基于A V L C R U IS E搭建整车传动系统仿真模型,研究装载机在典型作业循环工况下的整车行驶能耗,为装载机电驱动系统的设计提供仿真支撑。仿真结果表明,对于所研究的某型5 t级装载机而言,在典型V形作业循环过程中,采用电驱箱、电驱桥和轮边驱动等3种构型的行驶系统电耗相差较小,轮边驱动构型的电耗具有相对优势。提出在进行纯电驱动装载机的设计时,应从降低整机成本、控制系统开发、电机选型难易和整车空间布置等方面选择电驱动构型。     

自行式工程机械液压系统的节能技术

节能是当前流体传动和控制技术中的重要课题之一。以大功率液压传动系统驱动的自行式工程机械必须设法提高液压系统总效率,以节约燃料费用。本文综述了近年来国内外正在发展的节能技术,分析了工作原理及应用场合,作了一些理论分析。     

电动装载机传动系统动力匹配及应用软件开发

为加快电动工程机械发展,提高电动工程机械传动系统动力匹配的便捷性和准确性,本文以电动轮装载机为设计对象,开发了电动装载机传动系统动力匹配软件。该软件具有工况数据清洗与储存、面向动力性、经济性和制造成本的传动系统参数多目标优化、传统系统参数可视化对比校验等功能。应用实例表明,该软件可以快速实现电动装载机传动系统的最佳动力匹配。     

工程机械虚拟设计制造系统开发及应用

介绍了基于SolidEdge系统平台的工程机械虚拟设计制造系统的组成及开发内容。对于该技术方案的应用,介绍了机械通用零部件CAD系统的开发、压路机传动系统运动仿真、有限元分析以及与SolidEdge集成技术研究、压路机典型零件NC代码自动编程和基于SolidEdge平台的可视化CAPP系统开发。     

全地面起重机动力传动技术

摘要：概括工程机械中应用较为普遍的机械传动系统和静液压传动系统的性能特点,介绍格鲁夫全地面起重机采用的混合动力传动系统,以及徐工重型全地面起重机的双动力传动技术。认为以机械传动与静液压传动系统相结合为基础的混合传动和双动力技术提供了解决全地面起重机动力性能提升的技术方案,是未来全地面起重机动力传动技术的主要发展方向。     

油电混合动力在工程机械中的应用

本文介绍了油电混合动力系统的主要特点及系统的分类,简要综述了工程机械中油电混合动力的国内外应用情况,并对此系统的多向发展进行了实例探讨分析和技术展望,为研究工作的向前推进有重要意义。     

工程机械液压传动系统的故障分析与维修处理

文结合笔者多年工程机械技术管理实践,从工程机械液压传动系统故障的特点分析入手,详细介绍工程机械中几种常用液压器件故障的分析与判断方法、并对工程机械液压传动系统的故障排除措施及故障预防进行了详细阐述和总结。     

纯电动装载机动力传动系统设计与开发

以某款纯电动装载机为对象,对其进行动力传动系统方案设计及关键零部件的研制与开发。完成整机电驱动动力传动系统匹配设计及电机选型,并开发出专用的无变矩器电驱变速器。通过试验验证电驱动动力传动系统匹配设计及电机选型的正确性。试验结果表明所开发的电驱专用变速器满足整机需求,该款电动装载机可节能63%。     

工程机械多功能试验合控制系统剖析

工程机械多功能试验台用于工程机械的牵引及加载试验.该试验台可悬挂工程机械的多种工作装置,以研究工程机械工作装置的作业机理和性能参数选择.试验台主要由机械结构系统、液压系统、控制系统、测试系统和电力系统等组成.介绍试验台控制系统的结构组成、控制原理和技术特点.     

A Petri net simulation model for virtual construction of earthmoving operations

A common and extended Petri net simulation framework for virtual construction of earthmoving operations is developed to simulate dynamic changes of workflow and information flow in the earthmoving construction process and illustrate the constraint relationship between various operational equipment and construction restrictions. The proposed framework considers factors that influence earthmoving operations including randomness of construction activities, individual preference of equipment scheduling, and constraint relationship between equipment and construction environment. With the given equipment availability and project indirect cost, the framework can predict construction situation, equipment utilization rate, estimated duration and cost to achieve visualized and intelligent scheduling of virtual construction process in earthmoving operations. The simulation process is conducted on the CPNTools platform. The data required by the research were collected on-site in an actual case. The randomness of construction activities in earthmoving operations and main factors influencing construction are simulated. The sensitivity analysis for the model is carried out. The study will provide technical support and a management basis for equipment scheduling of earthmoving operations.     

工程机械故障控制理论与方法

针对工程机械中关键部件的故障特点,提出了工程机械故障控制理论和方法.通过对设备关键部件进行性能评估及剩余寿命预测,实施工程机械预维护,从而有效实现工程机械故障控制.首先介绍设备状态演化过程;然后提出工程机械故障控制方法及系统架构,其中RBF(Radial Basis Function,径向基)神经网络特征趋势预测为关键...     

土方作业设备管理虚拟施工模型及仿真分析

以土方施工过程中的设备管理为研究对象,基于Petri网理论和工作流模型原理,构建了土方作业虚拟施工9元组有色Petri网仿真模型。模型描述了施工过程中工作流与信息流的动态变化,考虑了各种作业设备与施工约束条件之间的关系。根据施工作业的设备数量和项目成本等信息,对土方作业不同设备组合的施工情况、预计完成时间、成本及设备使用率进行仿真模拟和讨论。仿真模型基于CPNTools平台运行,通过项目现场收集数据进行模拟,对模型进行敏感度分析和模型验证,表明该模型能够提高土方作业施工过程的仿真结果准确度。     

国外工程机械新机型述评

介绍包括意大利DAVINO公司的自行式小型混凝土搅拌运输车,美国特雷克斯公司的前卸式混凝土搅拌运输车,美国卡特彼勒公司的底卸式自卸车,加拿大TRECAN公司、俄罗斯BHNN建设机械厂、美国SNOWDRAGON公司的融雪车(机)等产品在内的个性化国外工程机械新机型,简述其性能特点,并为我国工程机械企业开发个性化工程机械产品与节能减排新机型提出建议.     

Multi-agent-based simulation system for construction operations with congested flows

This study aims to develop a multi-agent-based simulation system to evaluate the traffic flow of construction equipment in construction site. It is known that traffic flow of construction equipment affects work efficiency and productivity. The conventional modeling approaches for discrete event simulation, however, have a limitation in simulating the flow of construction equipment because construction equipment has continuous dynamic behavior in the traffic flow. In order to describe behavioral characteristics of construction equipment by identifying changes in a dynamic environment, this study proposes the multi-agent-based simulation system and applies and tests it to simulate earthmoving operations. It is anticipated that the results of this study will help working-level construction engineers to assess the impact of traffic congestion during construction planning.     

A model for automated monitoring of road construction

Monitoring and control of earthmoving operations is gaining an increasing interest. Manual monitoring and control of earthmoving operations have not yielded the expected results. Additionally, because manual monitoring is labor‐intensive, construction managers have to choose between monitoring based on rough estimates, or spending a lot of time collecting and processing data. The latter choice distracts them from many other important duties. The purpose of the present model is to automatically collect and process monitoring data providing the construction manager with real‐time control information. The model was developed for road construction. It uses GPS technology for automated data collection, logging the locations of all the earthmoving equipment while working on the project. Specially developed algorithms convert these locations to control information regarding productivity, duration (or progress) and actual consumption of materials. The model was implemented and tested for 3 weeks in a road construction project. The performance of four activities was measured by the model and compared to manual measurement of the same parameters. This comparison indicated that the model could reach a deviation of ±5%.     

Automated project performance control of construction projects

Real-time control of on-site construction is a growing field still in its infancy. The most impressive developments to date are in the area of earthmoving operations where quality control tools and tools to support the functionality of earthmoving equipment operators have been introduced—the main ones are described in this paper. A number of research efforts to fully automate project performance control of various project performance indicators have been carried out at the Technion in recent years. These are also briefly described together with the concept of measuring indirect parameters and converting them into the sought indicators. These are (1) labor and earthmoving productivity based on measuring the location of workers or earthmoving equipment at regular time intervals; (2) progress based on the above data or data collected from a tower crane; (3) a comprehensive control of construction materials starting by monitoring orders and purchasing up to the movement of the materials on site; and (4) monitoring the status of guard rails to prevent falls from heights.     

An Automated Modeling System for Simulating Earthmoving Operations

Resource-based modeling (RBM) is a general methodology for automating the modeling process of construction simulation. This paper substantiates the RBM concepts and develops an automated modeling system for simulating earthmoving operations (RBM-earth). Focusing on the properties involved in earthmoving operations, an atomic model library consisting of eight basic atomic models, an equipment database, miscellaneous linking structures, and the user interface have been developed in RBM-earth. While using RBM-earth to construct a simulation model, the user only needs to select required equipment and to specify project information for the operation. The information will be incorporated automatically into atomic models to generate project-specific atomic models that are then assembled into a working model for the project. The model can be directly experimented by using SLAMSYSTEM. The biggest advantage of RBM-earth is that a flexible project-specific simulation model can be generated in a very little time without requiring the user to be proficient in simulation, as required by many current modeling systems. Therefore, simulation can be made an applicable tool for construction practitioners.     

SD系列多功能旋挖钻机双动力系统

多功能旋挖钻机是一种适用于建筑基础工程成孔作业的桩工机械.为响应建设资源节约型和环境友好型社会的号召,努力实现企业产品优化、降本增效及节能环保,适应工程机械的未来发展趋势,在成熟产品SD系列多功能旋挖钻机的基础上研发出一套双动力系统,即在原有的以柴油机为动力的系统之上,增加一套电力驱动系统,在有电力供应条件时,可切换为电动机驱动,从而实现双动力驱动.该系统可适应现代城市施工的低噪声、无污染及节能环保要求,具有很好的市场前景.