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Experimental study of modal parameter identification in a simulated ambient-excited structure

JI Xiaodong, QIAN Jiaru, XU Longhe

《结构与土木工程前沿（英文）》 2007年第1卷第3期页码 281-285 doi: 10.1007/s11709-007-0036-9

摘要： Structure modal parameter online identification was used to monitor the structural health as evidenced by changes in the vibration characteristics. The natural excitation technique and the eigensystem realization algorithm were combined to identify the modal parameters in the time domain of a structure excited by simulated ambient vibrations. The mass-normalized mode shapes were obtained from the eigen-sensitivity analysis. The experimental modal analysis was performed on a two-story steel braced frame model excited by simulated ambient vibrations and hammer impacts. The mass-normalized mode shapes were acquired by changing the structural mass and by eigen-sensitivity analy sis. From finite element analysis results and the experimental data, it is shown that this method is effective.

关键词： eigensystem realization eigen-sensitivity analysis realization algorithm vibration effective

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Ambient vibration testing and updating of the finite element model of a simply supported beam bridge

Ivan Gomez ARAUJO, Esperanza MALDONADO, Gustavo Chio CHO

《结构与土木工程前沿（英文）》 2011年第5卷第3期页码 344-354 doi: 10.1007/s11709-011-0124-8

摘要： An ambient vibration test on a concrete bridge constructed in 1971 and calibration of its finite element model are presented. The bridge is characterized by a system of post-tensioned and simply supported beams. The dynamic characteristics of the bridge, i.e. natural frequencies, mode shapes and damping ratios were computed from the ambient vibration tests by using the Eigensystem Realization Algorithm (ERA). Then, these characteristics were used to update the finite element model of the bridge by formulating an optimization problem and then using Genetic Algorithms (GA) to solve it. From the results of the ambient vibration test of this type of bridge, it is concluded that two-dimensional mode shapes exist: in the longitudinal and transverse; and these experimentally obtained dynamic characteristics were also achieved in the analytical model through updating. The application of GAs as optimization techniques showed great versatility to optimize any number and type of variables in the model.

关键词： modal analysis parameter identification ambient vibration test Eigensystem Realization Algorithm (ERA) method finite element method

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Design and realization of a remote monitoring and diagnosis and prediction system for large rotating

Shaohong WANG, Tao CHEN, Jianghong SUN

《机械工程前沿（英文）》 2010年第5卷第2期页码 165-170 doi: 10.1007/s11465-009-0090-1

摘要： Traditional on-site fault diagnosis means cannot meet the needs of large rotating machinery for its performance and complexity. Remote monitoring and diagnosis technology is a new fault diagnosis mode combining computer technology, communication technology, and fault diagnosis technology. The designed remote monitoring and diagnosis and prediction system for large rotating machinery integrates the distributed resources in different places and breaks through shortcomings as the offline and decentralized information. The system can make further implementation of equipment prediction technology research based on condition monitoring and fault diagnosis, provide on-site analysis results, and carry out online actual verification of the results. The system monitors real-time condition of the equipment and achieves early fault prediction with great significance to guarantee safe operation, saves maintenance costs, and improves utilization and management of the equipment.

关键词： large rotating machinery remote monitoring fault diagnosis prediction system

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Self-generation of machining precision and its realization in lapping of super precision solid balls

ZHANG Bopeng

《机械工程前沿（英文）》 2008年第3卷第3期页码 348-353 doi: 10.1007/s11465-008-0065-7

摘要： This paper presents the principle of self-generation of machining precision by explaining its basic concept and five necessary conditions for forming a system with self-organization capability. A self-generation system is a kind of system with self-organization capability. The self-generation of machining precision for solid balls with super precision is emphatically explained. From the viewpoint of self-organization, there are three types of systems including system 1 with the self-regulation capability, 2 with the self-determination capability of goals, and 3 with the self-organization capability. Although they are all closed loop control systems, they have different constructions and functions. Necessary conditions for achieving self-generation of machining precision are given. Establishment of the system for machining solid balls with super precision is discussed. Self-generation of machining precision for solid balls with super precision on the basis of the capability of self-removal of errors is presented. Self-generation includes the ability of self-removal of errors for solid balls, convergence of self-removal of errors, self-generation of precision, and self-generating system for the given.

关键词： self-generation necessary self-regulation capability viewpoint Necessary

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Automatic Design Theory and Realization of Kinematic Schemes for Mechanism System

YE Zhi-gang, ZOU Hui-jun, GUO Wei-zhong, HU Song, TIAN Yong-li, XU Yong

《机械工程前沿（英文）》 2006年第1卷第1期页码 48-55 doi: 10.1007/s11465-005-0014-7

摘要：

Based on an analysis of mechanism combination methods of a current mechanism system kinematic scheme, input/output kinematic behavior and their constraint relations were proposed to represent the kinematic behavior knowledge of a mechanism system. Furthermore, a tree structure of a kinematic behavior decomposition process for a mechanism system was provided. Considering multiple outputs for a mechanism system, the matching algorithm and the attributes propagation method of kinematic behavior were used to generate a mechanism combination scheme. Its intermediate design solution and the constraint relations between input and output are generated to fill the common blackboard. Moreover, using information in the blackboard as input motion, the behavior attributes of other process actions are transmitted to attribute items of the blackboard, which finally enables a computer-aided automatic design process of a mechanism system kinematic scheme. To avoid the problem of schemes combination explosion caused by unbounded depth in the search process, bounded depth-first search was used to control the number of expanded hierarchies for a design tree. Finally, an example was given to show its feasibility and solution efficiency.

关键词： combination explosion unbounded computer-aided automatic mechanism combination information

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An application of game theory in distributed collaborative decision making

Angran XIAO

《机械工程前沿（英文）》 2019年第14卷第1期页码 85-101 doi: 10.1007/s11465-019-0523-4

摘要： In a distributed product realization environment, new paradigms and accompanying software systems are necessary to support the collaborative work of geographically dispersed engineering teams from different disciplines who have different knowledge, experience, tools and resources. To verify the concept of collaboration by separation, we propose a generic information communication medium to enable knowledge representation and exchange between engineering teams, a digital interface. Across digital interfaces, each engineering team maintains its own perspective towards the product realization problem, and each controls a subset of design variables and seeks to maximize its own payoff function subject to individual constraints. Hence, we postulate the use of principles from game theory to model the relationships between engineering teams and facilitate collaborative decision making without causing unnecessary information exchange or iteration across digital interfaces. A product design and manufacturing scenario is introduced to demonstrate the efficacy of using game theory to maintain a clean interface between design and manufacturing teams.

关键词： collaboration distributed product realization game theory digital interface

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福建省农业资源价值测算及生态价值实现路径分析

易小燕,黄显雷,尹昌斌,王恒

《中国工程科学》 2019年第21卷第5期页码 137-143 doi: 10.15302/J-SSCAE-2019.05.005

摘要：

以福建省农业资源价值为研究对象，借鉴相关理论研究模型，从生产功能的经济价值和服务功能的生态服务价值两类研究视角出发，完成了福建省农业资源价值测算研究。据此阐明了农业资源价值的实现过程和路径，提出了福建省农业资源价值提升的政策建议。研究表明，2015 年福建省的农业经济价值为3553.6 亿元，农业生态服务价值为11939.5 亿元，即农业的生态服务价值是其经济价值的3.4 倍，农业资源资本化具有较大潜力；农业生态服务价值中，休憩服务、温度调节、气体调节、土壤保持、水源涵养、生物多样性服务价值分别为3161.3 亿元、1119.2 亿元、748.0 亿元、1321.1 亿元、2178.1 亿元和3411.8 亿元。福建省农业资源价值实现的途径主要有农产品品牌建设、农业农村三产融合、农业生态补偿及绿色金融扶持，应从加大财政扶持、加强“三品一标”建设、推进农业农村产业融合、健全农业生态补偿体制机制和强化生态意识教育宣传等方面着手，进一步提升福建省农业资源价值。

关键词：农业资源价值估算实现路径福建省

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中国动态大地坐标框架最优实现的方法与应用 Article

程鹏飞, 成英燕, 王晓明, 吴素芹, 徐彦田

《工程（英文）》 2020年第6卷第8期页码 879-897 doi: 10.1016/j.eng.2020.08.004

摘要：

2000国家大地坐标系（CGCS2000）作为正式发布的法定坐标系已运用了多年。在我国，所有基于全球导航卫星系统（GNSS）测站的坐标为了与CGCS2000框架保持一致，都需要进行坐标改正。实现最佳CGCS2000框架需采用不同的策略，而不同的策略会导致不同的结果，有的差异甚至达到几分米。GNSS测站坐标改正常用的两种方法是CGCS2000控制下的拟稳平差和板块运动改正，两种方法计算的结果相差超过10 cm。本文将监督聚类（supervised clustering）统计方法应用于GNSS基准站的选择，同时提出了GNSS测站大网数据处理分组的间距分区（partition spacing）法，并用板块运动改正将当前历元GNSS测站坐标归算至CGCS2000参考历元。结果表明，新的分区方法明显优于传统的地理分区方法。当以不分组的测站坐标为标准时，新分区方法得到的三维坐标分量的精度均优于2 mm。监督聚类法得到的x、y、z方向上的速度均方根（RMS）分别为0.19 mm·a^–1、0.45 mm·a^–1和0.32 mm·a^–1，远小于传统方法的0.92 mm·a^–1、0.72 mm·a^–1和0.97 mm·a^–1。此外，采用奇异谱分析（SSA）对位置非线性运动进行建模和预测。在东、北、高（E、N和U）方向，SSA的建模精度分别优于3 mm、2 mm和5 mm，在水平方向和垂直方向的预测精度分别优于5 mm和1 cm。

关键词：参考框架优化实现中国板块模型 CGCS2000维持非线性运动建模

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IP组播路由协议的研究与实现

李炜

《中国工程科学》 2002年第4卷第1期页码 82-88

摘要：

概述了组播路由协议。分析了协议独立的组播路由一稀疏模式（PIM-SM)的缺陷，提出多个会聚点（RPs)的PIM-SM的改进机制。多个RPs机制有效地提高了原有单个RP的PIM-SM协议的健壮性，有利于实现负载均衡、分类业务及提高系统的容错性能，并讨论多个RPs机制的开销问题。分析了 PIM-SM实现细节和组播技术的前景。

关键词：协议独立的组播路由一稀疏模式（PIM-SM) 多会聚点（RPs) 组播

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退火-遗传算法寻优及其实现

王英

《中国工程科学》 2008年第10卷第7期页码 57-59

摘要：

分析了遗传算法及退火算法的优缺点，提出用退火算法改进遗传算法局部的最优值搜索效率低问题。退火算法与遗传算法融合后，使算法在寻优结果上更加迅速精确。通过水泥的配比工程实例，与单纯的遗传算法的结果进行对比，说明该方法是有效的。

关键词：遗传算法退火算法遗传算法改进

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地图线状要素注记自动配置的算法与实现

殷勇,李成名,丁圣陶

《中国工程科学》 2013年第15卷第5期页码 30-36

摘要：

本文探讨了线状要素自动注记的几个关键问题，提出利用注记参考线计算线状要素的注记定位线，同时提出反Douglas算法进行注记参考线的动态分段，利用动态分段的结果集获取线状要素的平滑位置作为候选注记位，在此基础上获取注记中每个字的备选位置以及评分，最后采用禁忌算法解决注记之间的冲突，从而较好地解决了线状要素注记不可见或表达模糊的问题，实现了自动注记输出的完整性和美观性的统一。

关键词：线状要素注记自动配置参考线反Douglas算法

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长江堤防安全评价的理论方法和实现策略

李青云,张建民

《中国工程科学》 2005年第7卷第6期页码 7-13

摘要：

对长江堤防安全评价的理论与方法进行了较为系统的阐述。重点论述了长江中下游堤防的特点和破坏机理，分析了与堤防安全有关的基本因素；针对堤防安全评价的层次性和动态性等特点，初步建立了长江中下游堤防安全评价的理论框架，提出了堤防安全评价的流程与方法。

关键词：长江堤防安全评价指标体系层次分析

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军事工程建设和谐管理的理论架构与实现模式

林茂光

《中国工程科学》 2012年第14卷第7期页码 24-33

摘要：

从军事工程建设区别于民用工程建设的特点出发，提出了军事工程建设和谐管理的背景。以组织行为学、军事工程经济学、现代项目管理学、系统协同进化理论为理论依据，并从军事工程建设和谐管理的本体论、认识论、方法论出发，描述了军事工程建设和谐管理的“人—事—物”逻辑关系及其系统架构，以及军事工程建设和谐管理的运行机理，从而建立了军事工程建设和谐管理的理论架构。从“领导—员工—团队”主体要素的人理和谐、“质量—工期—成本”客体要素的物理和谐、“知识—工具—方法”关系要素的事理和谐、“军事—技术—经济”系统环境和谐4个方面探讨了军事工程建设和谐管理的实现模式，并构建了军事工程建设和谐管理模式的评价模型。

关键词：军事工程建设人和物适事谐耦合进化和谐管理