对LJ-60型拌和机石料烘干系统的分析与改进设计

通过对现行LJ-60型拌和机石料烘干系统的分析,结合设备的具体情况,提出了改进设计方案,并介绍了实施办法和系统功能.     

搅拌设备液压传动系统的探讨

根据搅拌过程的工作特点,讨论了搅拌设备的液压传动系统方案,给出了液压系统原理图.研究表明,搅拌设备的机、电、液一体化是实现智能化的必要条件之一;搅拌设备的液压传动系统应采用变量泵-定量马达容积调速回路.     

TJ—5型沥青混合料试件用搅拌机的设计

本文介绍了一种供制作沥青混合料实验室试件用的搅拌机,简要地说明了装置的结构和临界速度的确定等问题.     

雷达双频电站

简要介绍了XXX双频电站主要设计要求。介绍了电站的供电模式、集成模式、结构设计、功能设计、软件设计。     

Development of a time-to-digital converter IC for laser radar

A CMOS time-to-digital converter IC with half-nanosecond resolution by inverter-delay-time has been developed for measuring time intervals with a fully digital circuit. A new circuit “ring-gate-delay” system using two revolution counters can make the area of the circuit far smaller than it would be without them. Accuracy is assured through digital processing with a 2 MHz crystal clock reference. A time resolution of 0.5 ns and a measurement range of 0–2200 ns using 1.5 μm CMOS were confirmed.     

Development of the scanning laser radar for ACC system

In recent years, the development of the adaptive cruise control (ACC) system with the aim to improve driving convenience and comfort, has been progressing. To put this ACC system to practical use, the elimination of unexpected acceleration or deceleration caused by incorrect judgment is highly demanded. From 1997, the Laser Radar ACC system has been produced for the domestic version of the Lexus LS400. It provides high recognition capability with a two-dimensional scanning technology at an affordable price. This paper introduces this Laser Radar with a high-performance two-dimensional scanning technology.     

地质雷达在莲花山隧道质量检测中的应用

结合地质雷达在广东江鹤高速公路莲花山隧道检测的工程实例,分析了隧道支护各种状况下的典型波形图像,简要介绍了地质雷达检测的应用效果。     

朔黄铁路路基病害地质雷达探测技术研究

以朔黄铁路工程探测实例,介绍了地质雷达探测路基病害的探测方案和方法;结合实测资料,分析了道碴厚度、道碴陷槽、翻浆冒泥、下沉外挤和桥头下沉等病害的雷达信号特征.采用底面加长PVC板的屏蔽天线直接探测,不仅排除了钢轨、枕木等干扰,而且能满足铁路快速、无损检测和不影响正常行车的要求.     

铁路(60+128+60) m系杆拱连续梁施工技术

系杆拱连续梁在铁路工程中较少采用,京津城际铁路跨北京四环路设计采用(60+128+60) m系杆拱连续梁桥.结合该桥的工程特点,采用先梁后拱的施工顺序,其关键施工技术主要有墩顶现浇段施工、对挂篮进行适应性改进、施工中的安全防护、连续梁合龙及体系转换、钢管拱的制作与安装、钢管拱内混凝土的顶升、施工监测及线形控制等.     

Technology analysis and low-cost design of automotive radar for adaptive cruise control system

Recently, the advanced driver assistance system (ADAS), which helps mitigate car accidents, has been developed using environmental detection sensors, such as long and short range radar, lidar, wide dynamic range cameras, ultrasonic sensors and laser scanners. Among these detection sensors, radars can quickly provide drivers with reliable information about the velocity, distance and direction of a target obstacle, as well as information about the vehicle in changing weather conditions. In the adaptive cruise control system (ACCS), three radar sensors are usually needed because two short range radars are used to detect objects in the adjacent lane and one long range radar is used to detect objects in-path. In this paper, low-cost radar based on a single sensor, which can detect objects in both the adjacent lane and in-path, is proposed for use in the ACCS. Before designing the proposed radar, we analyzed the world-wide radar technology and market trends for ACCS. Based on this analysis, we designed a novel radar sensor for the ACCS using radar components, such as an antenna, transceiver module, transceiver control module and signal processing algorithm. Finally, target detection experiments were conducted. In the experimental results, the proposed single radar can successfully complete the detection required for the ACCS. In the conclusion, the perspective and issues in the future development of the ACCS radar are described.     

风神·蓝鸟轿车倒车雷达系统的结构原理与使用维修

介绍了风神·蓝鸟轿车倒车雷达系统的组成、工作原理及控制功能,并对技术使用与故障排除作了简要阐述.     

黄海牌DD6119K60多功能客车的设计

论述黄海牌DD6119K60多功能客车的设计思想、设计原则和设计特点。     

风雨60年,济南公交打造一流服务品牌

2008年10月30日,济南公交迎来了自己的60周年华诞。从最初的1条线路、18辆破车,发展到现在的4000余辆公交车,180条线路。济南公交逐步发展壮大,取得了翻天覆地的可喜变化。     

应力波法基桩检测中复杂地层等效转换

利用应力波法一维线性杆状体理论推导得到的反射系数K，结合不同工程地质条件的波阻抗差异，分析了复杂地质条件对基桩检测的影响，并假设在基桩完整的条件下，提出了复杂地层等效转换的基桩模型，最后通过工程实例予以说明。     

某雷达配套中频电站并联运行电路设计

根据雷达供电要求,采用自动同步器、负荷分配器和调速控制器等控制器件设计了机组并联运行控制电路,试验结果表明,该控制系统操作简单,运行稳定可靠,达到了设计要求。     

60周年国庆阅兵车掠影——商用车担当阅兵车重任

武器装备历来是国庆阅兵的主要看点. 2009年10月1日上午,国庆60周年阅兵式上,30个国庆阅兵装备方队以高昂的气势、雄伟的英姿通过天安门广场,接受党和国家领导人以及祖国人民的检阅.令我们自豪的是受阅装备全部由我国自主研发和生产,其中90%属首次公开亮相,集中反映了国家科技进步和技术创新的最新成果,充分展现了我国国防和军队现代化建设的巨大成就.     

区域气象雷达在高速公路建设超短期自助天气预报中的应用

基于高速公路建设对天气预报较其他行业的差异化需求和在实际施工中遇到的诸多问题,初步探讨了利用已开放的区域气象雷达站的雷达动态图进行超短期自助预报的问题,并提出了进一步应用的建议。     

Network performance analysis and manuever model for overtaking assistant service using wave

We present network requirements for an overtaking assistant service using wireless access in vehicular environment (WAVE). Currently, DNPW has been proposed as a representative overtaking assistant service with vehicle-tovehicle (V2V) communication. In order to analyze its network performance, we construct a maneuver model for an overtaking system. According to this model, we configured a scenario for network simulation based on the 802.11p WAVE standard. The results confirm that a radio range for overtaking needs only a single hop without routing methods. Moreover, we propose an additional safe distance for the communication delay generated by an increase in the numbers of neighboring vehicles. And for high priority activity of safety services, we present a proper access category (AC) of enhanced distributed channel access (EDCA). These analysis results should be tested considered in real safety service systems that use V2V communication.