基于FLL120MK微波功率放大器的设计

随着无线通信技术的发展,高性能的无线通信设备成为人们的研究方向,在这当中功率放大器担当着关键角色。本文介绍了FLL120MK As Ga场效应管在微波功率放大器中的应用,详细的说明了原理图及电路板的设计和仿真,电路板的装配及调试;认真分析了影响功率放大器的性能参数的原因,对输出功率、频率响应、失真度、信噪比和输出阻抗等方面都都进行了讨论。本文完成率L波段10W功率放大器的研制,最终产品测试结果表明该放大器满足指标要求。     

泛华测控最新推出汽车摇窗机装配测试系统

近日,北京中科泛华测控技术有限公司设计并研制的汽车摇窗机装配测试系统已正式交付使用。该系统是泛华测控专为车窗电机和电子模块生产线的装配和检测而设计的。     

浅谈飞机总装自动化装配生产线

阐述了某型飞机总装生产线通过对柔性制造技术、自动化装配技术、数字化测量技术、精益制造及信息化等先进技术研究与应用,实现飞机的准确定位支撑、大部件自动化对接、整机数字化测量及平稳性移动,从而提高飞机总装配技术水平,提高生产效率,缩短生产周期,降低生产成本。     

固定资产管理系统中读写器模块的硬件设计

针对固定资产管理存在专职管理人员少,数据采集方式落后等问题,设计了一种基于zigbee和RFID技术相结合的固定资产管理系统,着重研究了系统中读写器射频前端模块硬件电路中的关键技术。选择的R1000为UHF RFID射频收发核心芯片,采用"驱动放大器+功率放大器"的电路结构,以及3d B功率分配与合成技术。从电路的性能测试和整个读写器系统的测试结果可以看出,较传统方式读写器数据采集过程更加自动化、采集速度更快、识别率更高的优点。     

面向生产线的全自动微小零件装配系统研制

为面向生产线实现微小零件的全自动装配,对装配前自动上料、装配后零件的自动锁紧、机械臂模块设计和装配过程中零件视觉定位策略等问题进行了研究。首先,系统采用模块化设计结构,设计了装配作业模块,视觉测量模块,装配平台模块和上料平台模块四部分,为适应生产线操作实现自动化装配,设计了自动上下料模块。然后,为实现多种零件的稳定拾取和装配设计了集成力传感器单元和柔性单元的机械臂,同时设计了锁紧夹具能够实现零件装配后的自动锁紧。最后,针对零件制定合理的装配策略,利用视觉测量的方法获得零件的位置和位姿信息实现零件的装配。实验结果表明:该装配系统可以实现微小零件自动装配的任务。     

基于Web的机械设计CAD信息测试管理系统研究

随着计算机技术和网络技术的不断发展,各种计算机辅助系统得到长足的发展,尤其在工作生产过程中可以实现自动化、智能化管理。机床设计CAD信息测试管理系统在生产过程中,起到重要的作用,本文就基于Web技术的机床设计CAD信息测试管理系统在网络上的实现进行了研究。对测试管理系统的总体设计、模块设计和关键技术实现进行了简单的分析,为企业建设自己的基于Web技术机床设计CAD信息管理系统提供参考。     

基于UG的发射箱自动化虚拟装配系统开发

目前实际生产中发射箱与纵筋的虚拟装配是依靠人机交互的方式进行。为了提高装配效率,对自动化虚拟装配技术进行了研究。通过对UG装配模块进行二次开发,建立了组件位置数据库、干涉报告数据库,提出了一种新的干涉计算方法,并将全部的工艺参数、组件信息、数据库调用命令嵌入至API操作函数编制的程序中,省略了干涉检测复杂的交互设置,开发了一套实现自动化装配与干涉检测的系统。以发射箱与纵筋装配为例,进行了装配实验。结果表明该系统大大减少了人机交互步骤,提高了虚拟装配的效率。     

建立大型汽轮机机组低压模块质量考核标准的探讨

通过对某百万核电低压模块现场测试与实验,结合数值模拟分析,探讨一套低压模块整体质量测试和装配变形考核方法.用以指导大型低压模块运行前的装配检查.     

自动拧紧系统在电机控制器生产线上的应用

通过分析电机控制器装配过程的螺钉拧紧工艺需求、质量控制信息采集与追溯的需求,对其装配自动化生产线的螺钉拧紧工作站进行了设计,根据螺钉拧紧技术重点对螺钉枪、送钉装置等进行了设计选型,结合工厂的MES系统,对螺钉拧紧力矩值采集的进行了应用设计,对实际应用效果进行了测试验证。对类似产品装配生产过程的自动化设计具有参考意义。     

平台化的休闲车发展模式

根据乘用车平台化的开发策略,提出休闲车的开发,借鉴乘用车平台化的车型规划和开发的技术方式。通过将休闲车的整车结构按功能划分成几个模块,通过简洁的连接面将各个模块连接成为整车。根据功能划分的模块能实现结构集成和模块的独立制造和模块装配,提高制造精度和装配效率。通过模块的技术改进来实现整车技术的逐步升级。     

基于L4960的直流稳压电源控制电路设计

采用太阳能供电的区域自动站,由太阳能电池板产生直流电,经电源控制模块变压后,一路为蓄电池充电,另一路输出稳定的电压为其他用电模块供电。其中的电源控制模块通常采用串联调整稳压电源,该电源属于传统的线性稳压电源,流过调整管的电流是连续的,管子总是工作在放大区,承受短路和过载的能力差,电路效率低。本文设计了一个以开关电源芯片L4960为核心的Buck变换器,转换效率高、电流大、波纹系数小、稳定性高,适用于区域自动气象站电源模块的开发应用。     

High power solid state rf amplifier for proton accelerator

A 1.5 kW solid state rf amplifier at 352 MHz has been developed and tested at RRCAT. This rf source for cw operation will be used as a part of rf system of 100 MeV proton linear accelerator. A rf power of 1.5 kW has been achieved by combining output power from eight 220 W rf amplifier modules. Amplifier modules, eight-way power combiner and divider, and directional coupler were designed indigenously for this development. High efficiency, ease of fabrication, and low cost are the main features of this design.     

A LabVIEW based automatic test system for sieving chips

The present trend for Complementary Metal Oxide Semiconductor (CMOS) chip designs is smaller in size and power consumption with multifunction. This results the difficulty for the testing engineer, especially for small amount production without an automatic probe station, to complete such task. In order to reduce the workload of the engineer, improve the testing efficiency and accuracy, a LabVIEW based automatic test system for such CMOS chip has been designed in this paper. The details of the overall system which includes the setup of the testing by using a PXI (PCI extensions for instrumentation) system with Data Acquisition (DAQ) and Source Measure Units (SMUs) module, and the LabVIEW based automatic testing program has been introduced in this paper. The testing results have shown that this system is able to improve the testing efficiency with great accuracy, at the same time to evaluate the testing results in real-time. Due to the software is built on different modules, and it is therefore easy to be extended for different applications.     

Bi-level modularity concept within a robotic assembly module of a microfactory setting

The aim of this work is to ameliorate development time and increase reconfigurability for microfactories by developing a module structure for production and assembly in order to form a layout for the production of a specific product when cascaded to each other. The module structure facilitates changes to configure the layout of the microfactory setting for the production of another product. This feature brings flexibility to the system in the sense of product design and customization of products. Each module, having its own control system, is able to perform its duty with the task units placed into it. In this work, the concept of process-oriented modules with bi-level modularity is introduced for the development of the mentioned module structure. The concept is tested with the implementation of a robotic assembly module. The realization of the assembly module includes miniaturization of task units like the parallel manipulators, transportation system in between the assembly nodes or in between different modules, and control system hardware. Visual sensor utilization for the visual feedback is also enabled for the assembly process at the necessary nodes. The assembly module is developed, and experiments are realized in order to test the performance of the module.     

档案库机电控制系统设计

提出了从档案信息检索、档案传输直至档案识别与存取全过程自动化的档案库系统。设计了档案库的库房温度、湿度、防火、防盗状态检测与控制模块、档案自动识别与存取模块，及其相关过程的控制流程，并分析了其工作原理，提出了具体实现方法。     

Online feature-based multisensor object detection system for bucket-wheel excavators

This paper proposes the development of a monitoring system to be applied for a production system (bucket-wheel excavator). The system is based on a multisensor-based object detection system. The main objective of the detection system is to obtain—in real time—reliable decisions on the presence of large stones in the transported overburden. The highest possible detection rate and the lowest possible false alarm rate should be achieved to avoid disturbances or failures of the production process. Due to the complexity of the considered production system, different physical effects are taken into account. The detection system consists of two detection modules (acceleration and laser scanner module), a plausibility module (weightometer module), and a fusion module. The acceleration module consists of five acceleration sensors. The acceleration signals are individually undergone preprocessing, feature extraction, and classification processes. The preliminary decisions of different sensor channels are fused to obtain statements about the presence of large stones. In the laser scanner module, the signal is prefiltered, filtered, validated, and classified in order to detect excavated stones. The weightometer module is based on two load cells signals. It is developed to approve the plausibility of the positive statements of the acceleration module. The fusion module is developed in order to synchronize and combine the output statements of different modules to obtain the production system state with respect to the presence of an object. The detection system is developed based on the acquired knowledge from the analysis of the production process and the analysis of the acquired data during the production process. The designed system has been implemented using standard industrial hardware. The testing results to be reported show that the system requirements can be fulfilled.     

通用T/R 组件全自动测试产线

T/R 组件是相控阵雷达的核心模块,有众多测试指标,控制信号复杂,为提高生产效率,急需一个全自动测试产线。为了解决上述问题,文中根据T/R 组件的冷却形式、所需测试指标、外形尺寸等特性,研制了一套由冷却系统、机械手、智能机架等组成的全自动测试产线。调试测试表明,该全自动测试产线满足T/R组件测试的所有需求,通过局部微调,还能够满足其他型号组件的全自动测试需求。该全自动测试产线现已交付生产部门投入使用。     

某固态发射模块冷板的设计及优化

固态发射模块的功率大,热耗高且过于集中,冷却系统的设计对于固态发射模块来说既是重点也是难点,冷却系统的好坏直接关系到固态发射模块能否正常工作。文中探讨了某固态发射模块的散热问题,分析了固态功放管的热耗,选择了强迫液冷作为其冷却方式,同时计算了所需的冷却液流量。通过仿真分析,对固态功放管的冷板进行不断的优化,最后设计出了满足需要的冷板—铜质微通道冷板。装机后对该冷板的实物测试,证明了该冷板的可行性。文中还对各种冷板冷却效果的差异进行了比较分析。     

汽车车身冲压工艺与模具关键技术研究

介绍了作者在汽车车身冲压工艺与模具关键技术研究方面的重要进展,主要包括斜拉延筋工艺方案,模块化模具设计技术和快速模具制造技术等。斜拉延筋工艺方案使拉延筋不仅具有控制材料流动阻力的功能,还有引导材料按期望的方向流动的功能,从而能有效地消除拉延成形中的起皱和拉裂。模块化模具设计技术将车身零件根据其结构特征进行分类,然后对同类零件的模具进行模块化分解,并建立相应的模块化设计数据库以提高设计效率,同时为设计制造过程的并行化提供便利。快速模具制造技术则以CAD/CAM技术为基础,将大型汽车车身模具分成平面组件和曲面组件,并采用专用装备实现这些组件的快速制造,然后用专用装备实现模具组件的组焊。工程应用实例表明,上述技术的综合运用可显著缩短汽车车身模具设计制造的周期,降低成本,并保证中小批量生产的品质要求。     

基于PLC的起动器自动装配机研制

针对工业生产过程中,冰箱起动器生产效率不高的问题,根据自动装配的工作原理,自行研制了基于PLC控制系统的自动装配机。介绍了该装配机的结构方案,对各主要模块进行了说明。针对控制要求,给出了系统的控制方案。分析了硬件的选用,软件的编写。最后通过现场调试和生产运行,证明该机器完全达到了设计要求,并将自动装配的思想推广到其他自动化生产领域。