内燃机行业发展现状

内燃机行业是我国机械工业中跨行业、跨部门最多的领域．内燃机是汽车、工程机械、农业机械、船舶、内燃机车、内燃发电设备、地质石油钻机、军用、各种通用机械等产品的配套动力。是各种配套产品的“心脏”。因此。内燃机行业的发展。对我国工业、交通运输、农业、国防建设。以及人民生活都有十分重大的影响。     

四川省机械研究设让院

深厚的历史底蕴四川省机械研究设计院成立于1957年。是四川省机械系统规模最大的综合性科研开发机构。经历50年的发展．现已成为集科研开发、工程设计、技术服务、生产销售为一体的科技型企业。多年来,我院与省内外．国内外机械、石油、化工、电力、冶金、轻工、有色金属、建筑、食品等行业的众多企业建立了广泛的业务联系和密切的协作关系。     

四川省机械研究设计院

深厚的历史底蕴四川省机械研究设计院成立于1957年，是四川省机械系统规模最大的综合性科研开发机构。经历50年的发展，现已成为集科研开发、工程设计、技术服务、生产销售为一体的科技型企业。多年来。我院与省内外国内外机械、石油、化工、电力、冶金、轻工、有色金属、建筑、食品等行业的众多企业建立了广泛的业务联系和密切的协作关系。     

中核苏阀科技实业股份有限公司

正中核苏阀科技实业股份有限公司是在承袭中国核工业集团公司苏州阀门厂的品牌、质保、技术制造和管理诸优势的基础上创立的股份有限公司,拥有十五家集商贸、机械制造、生物技术、核辐射利用等子公司的大型企业。公司于1997年在深交所上市,公司证券代码000777。目前公司能制造碳钢、不锈钢、超低碳不锈钢、合金钢、蒙乃尔和钛等特殊合金材料的阀门,能够承接各类大工程阀门的订单。公司采用ANSI、API、MSS、JIS、BS、DIN、NF、GB和JB等标准进行阀门的设计、制造、测试和验收。     

《农业技术与装备》投稿须知

<正>《农业技术与装备》欢迎广大涉农领域的技术人员、战斗在第一线的农业和农机科研、推广、管理人员以及涉农高校师生等踊跃投稿。向本刊投寄稿件,建议使用电子邮件。稿件应包括以下完整内容:题目、作者姓名、文章摘要、关键词、英文摘要和关键字、文章正文、参考文献、作者简介。稿件以3 000~5 000字为宜。具体要求如下:摘要是简明、确切地记述文献重要信息的完整短文。摘要的内容包括研究目的、主要的方法、结果和结论。     

电液锤技术的探索与研究

锻锤是机械制造业不可或缺的大型设备。以前的蒸汽一空气锤结构复杂、需配套动力设备（锅炉房、空气压缩站、管道）庞大、振动噪声大、污染环境、能量损失大、效率低。逐渐被结构紧凑、重量轻、造价低、高效率、节能环保的电液锤所取代。随着我国制造业进程的飞速发展,电液锤技术也取得了突飞猛进的业绩。     

《现代科学仪器》征稿启事

《现代科学仪器》是在国家有关领导人和著名科学家的指导和大力支持下诞生的。它是中国科技核心期刊,是国内最重要的以介绍和评论国内外仪器为主的综合性科技期刊。读者对象为各行各业实验室、试验室、研究室应用与维护仪器的科技人员及购置与管理仪器设备的人员;从事高技术及其产品研制生产的科技人员;各级有关管理决策人员;大专院校师生等。涉及物理、化学、生物、医疗卫生、制药、农业、地矿、机械、电子、石油、化工、冶金、能源、交通、环保、建筑、轻工、商检、技术监督等各项科技领域。     

TNG型多功能提取浓缩回收机组

成都永泰制药化工机械厂是专业生产制药机械、化工机械、食品机械成套设备的厂家。其生产的TNG系列多功能提取浓缩回收机组适用于中药、生化、食品等行业的常压、水煎、温浸、强循环渗漉、芳香油提取和有机溶媒回收及提取液、中药、植物、动物、食品、化工液料的浓缩。特别适用于热敏性物料(例如中药生产的水、醇提取液,抗生素发酵液,牛奶、果汁等)在真空低温条件下浓缩,可确保产品质量。也可用于中小药厂、实验工厂、医院、科研部门新药研制及新工艺提取与浓缩。     

西安亚星泵阀制造有限责任公司

正西安亚星泵阀制造有限责任公司是由西安亚星泵阀厂改制的股份制经济实体。公司是专业研制生产用于化肥、尿素和氯碱行业,高温高压强腐蚀管线的高中压阀门、管件及工业泵的生产厂家。公司主要产品在经过工业运行的实践检验后进行了针对性的改进。改进后的"化工高压截止阀"、"组合式高压止回阀"、"直线升降式高、中、低压截止阀"使用效果更佳,受到广大客户青睐。公司已通过ISO 9001:2000质量管理体系认证。主要产品:类别截止阀、止回阀、球阀、闸阀、调节阀、工业泵、高压管件、紧固件     

浅析企业管理制度建设

企业管理制度的概念、基本特点。管理制度建设的意义、作用、必要性、原则、方法和要求。重点阐述企业管理制度建设的实务操作。     

智能螺丝紧固系统的研究与开发

介绍高频头智能螺丝紧固系统,包括自动送料系统、自动点胶系统、自动锁紧系统、自动卸料系统及自动控制系统。该系统成本约仅为同类进口设备价格的1/3,投入使用后,锁螺丝速度达40~60pcs/min,与手工操作相比,工作效率提高10倍。     

Real-time tracking control of electro-hydraulic force servo systems using offline feedback control and adaptive control

This paper focuses on an application of an electro-hydraulic force tracking controller combined with an offline designed feedback controller (ODFC) and an online adaptive compensator in order to improve force tracking performance of an electro-hydraulic force servo system (EHFS). A proportional-integral controller has been employed and a parameter-based force closed-loop transfer function of the EHFS is identified by a continuous system identification algorithm. By taking the identified system model as a nominal plant model, an H_∞ offline design method is employed to establish an optimized feedback controller with consideration of the performance, control efforts, and robustness of the EHFS. In order to overcome the disadvantage of the offline designed controller and cope with the varying dynamics of the EHFS, an online adaptive compensator with a normalized least-mean-square algorithm is cascaded to the force closed-loop system of the EHFS compensated by the ODFC. Some comparative experiments are carried out on a real-time EHFS using an xPC rapid prototype technology, and the proposed controller yields a better force tracking performance improvement.     

偶数齿带式烧结机的研究

研究的偶数带式烧结机的星轮，是将星轮齿设计成偶数个，由匀速齿齿郭曲线和复俣齿（加速、匀速齿组合）齿廓曲线组成的齿廓，相间排列成的新型烧结机星轮。给出与之相匹配的该机头尾星轮弯道曲线方程。实现了台车列的匀速运动及单台车的追赶运动。可为偶数齿烧结机设计和奇数齿烧结机改造提供理论依据和实用参考。     

Integrated assembly and machining planning for electronic products using a genetic algorithm approach

To produce an electronic product, both assembly operations and machining operations are required in the process plan. In most cases, the assembly operations and machining operations need to be combined in a continued order with an integrated sequence. This is different from the traditional process planning approaches in which machining operations and assembly operations are separated as two independent tasks with no interactions. For an electronic product, the two types of operations and the associated costs may affect each other in an interactive way. Therefore, the sequence planning of assembly operations and machining operations must be analyzed with an integrated model. In this research, a graph-based model is presented to represent the assembly and machining operations in an integrated model. The related operation cost functions are developed to evaluate the costs for the integrated assembly and machining sequences. The integrated sequence planning problem is solved using a genetic algorithm approach with an objective of lowest operation costs. As a result, the assembly operations and machining operations can be planned in an integrated sequence suitable for producing electronic products. The result shows that the developed method using the genetic algorithm approach is efficient for solving the integrated sequence planning problem. Example products are demonstrated and discussed.     

袋装物料自动仓储系统设计

物流被称为企业的第三利润源,对企业的发展至关重要。文中以某企业袋装物料仓储车间为例,根据实地调研数据和企业对仓库的升级需求,对该仓库进行自动仓储系统设计。通过滚筒输送线、AGV、工业机器人等设备实现仓储物流设备与生产线对接,形成从包材供应、包装、成品入库、移库、出库的自动仓储系统。     

Optimized performances comparison of organic Rankine cycles for low grade waste heat recovery

An organic Rankine cycle (ORC) can be applied to recover the low-grade waste heat. In this paper, the performances of five different types of ORC are evaluated. These configurations include a simple ORC, an ORC with an internal heat exchanger (IHE), an ORC with an open feed organic fluid heater (OFOH), an ORC with a closed feed organic fluid heater (CFOH), and an ORC with a reheater. First, the feasible working region is defined for an ORC operating together with an internal combustion engine. Subsequently, the thermal efficiency of each ORC is maximized using a genetic algorithm. Finally, the characteristics of each ORC are analyzed and compared using a combination of the first law and second law method. Our analysis indicates that the ORC with an IHE showed the best thermodynamic performance. The ORC with an OFOH and the ORC with a CFOH are sub-optimal while the simple ORC and the ORC with a reheater are the last choice. The effects of the expander inlet pressure, the condenser outlet temperature and the expander isentropic efficiency on system performance of each ORC were also analyzed.     

Comparison of Implicit and Explicit Finite-Element Methods for the Hydroforming Process of an Automobile Lower Arm

Tubular hydroforming has recently attracted increased attention in the automotive industry and the finite-element analysis is an effective tool for evaluation and optimisation of the design of hydroforming dies and processes. In this paper, a comparison is made of an implicit and an explicit finite-element method, widely used for the hydroforming process. The influence of time scaling and mass scaling, which have been commonly used in order to save computational time, in an explicit method, for the hydroforming simulation of an automotive lower arm, are investigated. The comparisons focus on the accuracy of the predicted geometrical shape and the stress in the explicit method with various scaling factors.     

一种基于网络的面向拆卸设计的评价方法

面向产品的拆卸设计是绿色设计中十分重要的研究领域。本文构建了网络环境下面向产品拆卸设计的体系结构，研究了面向拆卸设计的产品结构模型。结合Z50E装载机的具体实例，进行了产品可拆卸性的评价分析及相应的设计修改建议。     

基于多代理的分布式规则调度研究

针对航空制造企业生产调度系统的复杂性,提出基于多代理和规则调度构建分布式调度系统。研究了系统的体系结构,给出了系统中代理的划分和功能介绍,介绍了代理之间的控制关系、代理的实现结构及代理间的通信机制,研究了基于多代理的分布式规则调度机制,最后基于JADE(Java Agent DEvelopment Framework)构建了适用于航空制造业的分布式规则调度系统,给出了其在某航空制造企业的生产调度中应用的实例。     

离心泵恒压变频调整状态下的特性研究

对离心泵在恒压变频调速状态下的特性进行了分析，提出了恒压变频调速幅度的确定方法，介绍了在离心泵定速特性曲线H-Q、N-Q、η-Q的基础上获得其恒压变速状态下[N-Q]、[η-Q]、[n-Q]特性曲线的方法。