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Remote calibration system for frequency based on in-place benchmark

Xiaobin HONG, Guixiong LIU, Zhuokui WU, Xipeng DU,

《机械工程前沿（英文）》 2010年第5卷第3期页码 316-321 doi: 10.1007/s11465-010-0021-1

摘要： According to the deficiencies of remote calibration mode based on material object reference, a new model of a remote calibration system for frequency based on in-place benchmark is introduced, which is made of a calibration subsystem on the spot and a remote management subsystem. The key technology of some key problems for the remote calibration system is particularly discussed, including the time and frequency benchmark receiving module based on global positioning system (GPS), frequency comparison based on a phase method, frequency division based on dual high-frequency phase locked loop (PLL), and remote calibration based on the web. The results show that the system possesses some characteristics, such as high precision, good versatility, and no limitation of time and place.

关键词： remote calibration in-place benchmark frequency comparison global position system (GPS)

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全球定位系统——建立太空卫星通信，改变地球上的日常生活

Peter Weiss

《工程（英文）》 2021年第7卷第3期页码 290-303 doi: 10.1016/j.eng.2021.02.001

关键词：工程成就

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基于RTK GPS系统的结构安全监测系统研究

王人鹏,姚连璧,孟晓林

《中国工程科学》 2011年第13卷第3期页码 63-70

摘要：

利用GPS系统在线监测获取的大量结构响应数据，完成了大量数据处理工作，得到了结构响应的时间序列。研究表明，基于结构响应的状态空间模型及ARMA模型是评估结构动力性能的有力工具，同时进一步验证了通过RTK GPS系统建立结构安全监测系统的可能性。

关键词： RTK GPS系统时间序列状态空间模型 ARMA模型有限元模型

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GPS车辆监控系统存在问题的探讨及解决方案

朱庄生,万德钧,王庆,张小国

《中国工程科学》 2003年第5卷第9期页码 49-54

摘要：

提供了笔者在实际工程应用中总结出的一些经验，为人们设计实用的、具有广泛推广价值的GPS（全球卫星定位系统）车辆监控系统提供参考；从数字地图、无线通信以及GPS三个部分入手，通过总结实际工程应用中遇到的问题和客户反馈的意见

关键词：全球卫星定位系统(GPS) 数字地图车辆监控系统通信系统

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GPS民间应用的一个最大市场——汽车导航系统

赵会平

《中国工程科学》 2001年第3卷第8期页码 64-69

摘要：

汽车导航系统是解决城市交通拥堵的一种高科技手段，是21世纪智能交通（ITS）的发展方向。我们应跳出“要致富先修路”的单纯想法，用科学的方法减少占用可耕地，促进汽车工业的发展。文章着重介绍了汽车导航系统的结构与工作原理，提出了三重精度的工程方案，其市场前景广阔。

关键词： GPS 汽车导航系统 ITS

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HY-2卫星双频GPS精密定轨技术

林明森,王晓慧,彭海龙,赵齐乐,李敏

《中国工程科学》 2014年第16卷第6期页码 97-101

摘要：

海洋二号（HY-2）卫星双频全球定位跟踪系统（GPS）接收机获取的GPS数据是基于非差简化动力学方法应用于HY-2 卫星精密轨道确定。差分GPS载波相位数据可以消除钟差，同时利用GPS数据获得HY-2卫星轨道和GPS卫星轨道。GPS数据确定的轨道利用激光测距进行了检核，并与法国太空总署确定的轨道以及综合定轨策略确定的轨道进行了比较，HY-2 卫星基于GPS数据精密轨道径向成分优于3 cm。

关键词：精密定轨 GPS 多普勒雷达和无线电定位组合系统(DORIS) 卫星激光测距(SLR)

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火箭炮交流位置伺服系统的鲁棒最优控制

柴华伟,马大为,李志刚,乐贵高,王锋

《中国工程科学》 2007年第9卷第10期页码 83-87

摘要：

为了实现某火箭炮交流伺服系统的高速、高精度位置控制，针对实际系统中存在的转动惯量和负载力矩变化大、冲击力矩强等各种不确定因素，提出了一种鲁棒最优控制方法。实验结果表明，该控制器鲁棒性强，而且具有较好的动态性能及稳态精度。

关键词：火箭炮交流位置伺服系统鲁棒控制最优控制

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Precision control system of two-DOF stage with linear ultrasonic motor

ZHANG Hanlei, SHI Yunlai, ZHAO Chunsheng

《机械工程前沿（英文）》 2008年第3卷第4期页码 421-425 doi: 10.1007/s11465-008-0063-9

摘要： Using an appropriate control method, linear ultrasonic motors can be used in applications requiring high position accuracy. In this paper, a closed loop PI control system is designed to achieve high position accuracy during the control of a two-DOF stage driven by linear ultrasonic motors. Two ultrasonic motors are mounted on the stage to generate motion in two orthogonal directions. The PI control algorithm is used to increase the stability and accuracy of position control. The -axis mover covers 30 mm forward and backward in less than 0.3 s settling time and the -axis mover in less than 0.4 s. Experimental results denote that the control strategy proposed in this paper appears to have high efficiency, quick response, and high accuracy.

关键词： settling position accuracy PI control control algorithm orthogonal

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Experimental and CFD analysis of nozzle position of subsonic ejector

Xilai ZHANG, Shiping JIN, Suyi HUANG, Guoqing TIAN

《能源前沿（英文）》 2009年第3卷第2期页码 167-174 doi: 10.1007/s11708-009-0001-5

摘要： The influence of nozzle position on the performance of an ejector was analyzed qualitatively with free jet flow model. Experimental investigations and computational fluid dynamics (CFD) analysis of the nozzle position of the subsonic ejector were also conducted. The results show that there is an optimum nozzle position for the ejector. The ejecting coefficient reaches its maximum when the nozzle is positioned at the optimum and decreases when deviating. Moreover, the nozzle position of an ejector is not a fixed value, but is influenced greatly by the flow parameters. Considering the complexity of the ejector, CFD is reckoned as a useful tool in the design of ejectors.

关键词： ejector nozzle position ejecting coefficient CFD

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基于GPS的高度计海面高度定标浮标设计

陈春涛,闫龙浩,张晓旭,张倩,翟万林,朱建华

《中国工程科学》 2014年第16卷第6期页码 109-112

摘要：

全球定位系统（GPS）浮标是高度计海面高度定标的重要仪器。本文介绍了GPS浮标的组成和工作原理，分别对GPS浮标的外型设计、舱体设计、密封性设计、供电设计做了详细介绍，最后利用数值模拟的方式，对设计的GPS浮标在3 级海况下的摇摆和升沉响应进行模拟试验。结果表明自主设计的GPS浮标能够满足海上高度计海面高度定标的需求。

关键词：卫星高度计定标 GPS浮标数值模拟

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利用GPS数据资料调查昭阳湖洪滩区沉积物的细度和含水量 Article

Mutiara Syifa, Prima Riza Kadavi, Sung Jae Park, Chang-Wook Lee

《工程（英文）》 2021年第7卷第2期页码 252-259 doi: 10.1016/j.eng.2020.12.011

摘要：文中利用GPS数据和航空摄影技术监测了昭阳湖洪滩区的沉积物。为了确保采样位置测量的准确性，我们比较了来自三个GPS单元的数据。

关键词：昭阳湖砂粒细度指数含水量 GPS数据数字表面模型

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GPS浮标测高精度影响因素研究

闫龙浩,陈春涛,翟万林,朱建华,张倩,张晓旭

《中国工程科学》 2014年第16卷第6期页码 102-108

摘要：

海洋二号(HY-2)卫星高度计已在轨运行两年多，亟需深入开展海面高度定标工作，基于全球定位系统（GPS）浮标的高度计海面高度定标法是主要的定标方法GPS浮标定标法的定标精度受到时间窗口、浮标姿态、温盐以及相位中心等因素影响。为了提高高度计海面高度GPS定标法的定标精度，本文对影响GPS浮标测高精度的主要因素进行了分析研究。结果表明，在充分考虑影响因素基础上自主研制的GPS浮标高程测量精度可以达到1 cm，满足高度计海面高度定标要求。

关键词： GPS浮标精度影响因素高度计定标

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航天器高精度GPS导航定位技术研究

向开恒,曲广吉

《中国工程科学》 2004年第6卷第1期页码 86-91

摘要：

将GPS测量定位技术、求解卫星轨道摄动运动的Encke方法和广义Kalman滤波技术有机地结合在一起，提出了利用GPS实现低轨道航天器高精度自主导航定位的新方法——载波相位-伪距综合动态定轨技术，解决了GPS载波相位应用中动态解模糊和跳周修复的难题。数值仿真分析和半物理仿真实验结果表明，所提出的动态定轨技术是可行的，对提高GPS导航定位精度的效果是显著的，并且其模型、算法和软件具有工程实用性。

关键词：航天器导航定位全球定位系统载波相位卡尔曼滤波

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Web-based construction equipment fleet management system: cost-effective global and local allocation

Hakob AVETISYAN, Miroslaw SKIBNIEWSKI

《工程管理前沿（英文）》 2017年第4卷第1期页码 76-83 doi: 10.15302/J-FEM-2017012

摘要： Over the last two decades, construction contractors have been gradually making more investments in construction equipment to meet their needs associated with increasing volumes of construction projects. At present, from an operational perspective, almost all contractors pay more attention to maintaining their equipment fleets in well-sustained workable conditions and having a high accessibility of the necessary equipment pieces. However, such an approach alone is not enough to maintain an efficient and sustainable business. In particular, for large-scale construction companies that operate in multiple sites in the U.S. or overseas, the problem extends to an optimal allocation of available equipment. Given the current state of the construction industry in the U.S., this problem can be solved by geographically locating equipment pieces and then wisely re-allocating them among projects. Identifying equipment pieces geographically is a relatively easy task. The difficulty arises when informed decision-making is required for equipment allocation among job sites. The actual allocation of equipment should be both economically feasible and technologically preferable. To help in informed decision-making, an optimization model is developed as a mixed integer program. This model is formed based on a previously successfully developed decision-support model for construction equipment selection. The proposed model incorporates logical strategies of supply chain management to optimally select construction equipment for any construction site while taking into account the costs, availability, and transportation-related issues as constraints. The model benefits those responsible for informed decision-making for construction equipment selection and allocation. It also benefits the owners of construction companies, owing to its cost-minimization objective.

关键词： Construction equipment Equipment assignment optimization Web-based asset management

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Numerical study of thermal characteristics of double skin facade system with middle shade

Shaoning LIU, Xiangfei KONG, Hua YANG, Minchao FAN, Xin ZHAN

《能源前沿（英文）》 2021年第15卷第1期页码 222-234 doi: 10.1007/s11708-017-0480-8

摘要： Architectural shade is an effective method for improving building energy efficiency. A new shade combined with the double skin façade (DSF) system, called middle shade (MS), was introduced and developed for buildings. In this paper, a 3D dynamic simulation was conducted to analyze the influence of MS combined with DSF on the indoor thermal characteristics. The research on MS for DSF involves the temperature, the ventilation rate, the velocity distribution of the air flow duct, and the indoor temperature. The results show that the angle and position of the shade in the three seasons are different, and different conditions effectively enhance the indoor thermal characteristics. In summer, the appearance of MS in DSF makes the indoor temperature significantly lower. The indoor temperature is obviously lower than that of the air flow duct, and the temperature of the air flow duct is less affected by MS. The influence of the position of blinds on indoor temperature and ventilation rate is greater than the influence of the angle of blinds. According to the climate characteristics of winter and transition season, in winter, early spring, and late autumn, the indoor temperature decreases with the increase of the position of blinds at daytime, but the opposite is true at night. The results found in this paper can provide reference for the design and use of MS combined with DSF in hot summer and cold winter zone.

关键词： middle shade position thermal characteristics double skin facade