Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 21

年份

2021 2

2020 3

2019 2

2017 8

2016 1

2008 2

2006 3

展开︾

关键词

OFDM 1

东亚季风 1

交通运输，碳排放预测，碳达峰，碳中和，发展路径 1

人脸识别 1

信道估计 1

倾斜镜；动态系统；输出输出耦合；物理建模；子空间辨识 1

光度立体法；三维重构；透视投影；图像分解 1

几何校正 1

分辨系数 1

区域气候模式 1

厄尔尼诺-南方涛动 1

地面气温异常 1

均匀流形逼近和投影 1

多年代际趋势 1

多投影面 1

子空间 1

实码加速遗传算法 1

对象跟踪 1

强化学习 1

展开︾

检索范围：

排序：展示方式：

monitoring of non-gaussian chemical processes with modes-switching using globality-locality preserving projection

Xin Peng, Yang Tang, Wenli Du, Feng Qian

《化学科学与工程前沿（英文）》 2017年第11卷第3期页码 429-439 doi: 10.1007/s11705-017-1675-6

摘要： In this paper, we propose a novel performance monitoring and fault detection method, which is based on modified structure analysis and globality and locality preserving (MSAGL) projection, for non-Gaussian processes with multiple operation conditions. By using locality preserving projection to analyze the embedding geometrical manifold and extracting the non-Gaussian features by independent component analysis, MSAGL preserves both the global and local structures of the data simultaneously. Furthermore, the tradeoff parameter of MSAGL is tuned adaptively in order to find the projection direction optimal for revealing the hidden structural information. The validity and effectiveness of this approach are illustrated by applying the proposed technique to the Tennessee Eastman process simulation under multiple operation conditions. The results demonstrate the advantages of the proposed method over conventional eigendecomposition-based monitoring methods.

关键词： non-Gaussian processes subspace projection independent component analysis locality preserving projection finite mixture model

HTML PDF 收藏

Finite element model updating of a large structure using multi-setup stochastic subspace identification

Reza KHADEMI-ZAHEDI, Pouyan ALIMOURI

《结构与土木工程前沿（英文）》 2019年第13卷第4期页码 965-980 doi: 10.1007/s11709-019-0530-x

摘要： In the present contribution, operational modal analysis in conjunction with bees optimization algorithm are utilized to update the finite element model of a solar power plant structure. The physical parameters which required to be updated are uncertain parameters including geometry, material properties and boundary conditions of the aforementioned structure. To determine these uncertain parameters, local and global sensitivity analyses are performed to increase the solution accuracy. An objective function is determined using the sum of the squared errors between the natural frequencies calculated by finite element method and operational modal analysis, which is optimized using bees optimization algorithm. The natural frequencies of the solar power plant structure are estimated by multi-setup stochastic subspace identification method which is considered as a strong and efficient method in operational modal analysis. The proposed algorithm is efficiently implemented on the solar power plant structure located in Shahid Chamran university of Ahvaz, Iran, to update parameters of its finite element model. Moreover, computed natural frequencies by numerical method are compared with those of the operational modal analysis. The results indicate that, bees optimization algorithm leads accurate results with fast convergence.

关键词： operational modal analysis solar power plant structure multi-setup stochastic subspace bees optimization algorithm sensitivity analysis

HTML PDF 收藏

Multiple fault separation and detection by joint subspace learning for the health assessment of wind

Zhaohui DU, Xuefeng CHEN, Han ZHANG, Yanyang ZI, Ruqiang YAN

《机械工程前沿（英文）》 2017年第12卷第3期页码 333-347 doi: 10.1007/s11465-017-0435-0

摘要：

The gearbox of a wind turbine (WT) has dominant failure rates and highest downtime loss among all WT subsystems. Thus, gearbox health assessment for maintenance cost reduction is of paramount importance. The concurrence of multiple faults in gearbox components is a common phenomenon due to fault induction mechanism. This problem should be considered before planning to replace the components of the WT gearbox. Therefore, the key fault patterns should be reliably identified from noisy observation data for the development of an effective maintenance strategy. However, most of the existing studies focusing on multiple fault diagnosis always suffer from inappropriate division of fault information in order to satisfy various rigorous decomposition principles or statistical assumptions, such as the smooth envelope principle of ensemble empirical mode decomposition and the mutual independence assumption of independent component analysis. Thus, this paper presents a joint subspace learning-based multiple fault detection (JSL-MFD) technique to construct different subspaces adaptively for different fault patterns. Its main advantage is its capability to learn multiple fault subspaces directly from the observation signal itself. It can also sparsely concentrate the feature information into a few dominant subspace coefficients. Furthermore, it can eliminate noise by simply performing coefficient shrinkage operations. Consequently, multiple fault patterns are reliably identified by utilizing the maximum fault information criterion. The superiority of JSL-MFD in multiple fault separation and detection is comprehensively investigated and verified by the analysis of a data set of a 750 kW WT gearbox. Results show that JSL-MFD is superior to a state-of-the-art technique in detecting hidden fault patterns and enhancing detection accuracy.

关键词： joint subspace learning multiple fault diagnosis sparse decomposition theory coupling feature separation wind turbine gearbox

HTML PDF 收藏

基于随机矩阵理论的子空间加权改良算法 Research Articles

高雨濛1,李姜辉2,柏业超1,王琼1,张兴敢1

《信息与电子工程前沿（英文）》 2020年第21卷第9期页码 1302-1307 doi: 10.1631/FITEE.1900463

摘要：在低信噪比及信号相关情况下，加权子空间拟合（WSF）算法的性能优于多信号分类（MUSIC）算法。本文使用随机矩阵理论（RMT）改善加权子空间拟合。随机矩阵理论研究随机矩阵维数以同速率增加时，矩阵特征值和特征向量的渐近规律。加权子空间拟合中，运用近似一阶扰动计算样本协方差矩阵特征向量的统计特性。利用随机矩阵理论中关于样本协方差矩阵信号子空间向真实信号投影的范数的渐进结果，获得加权子空间拟合计算方法。仿真结果表明，在低快拍数及低信噪比情况下，本文所提方法具有优越性。

关键词：波达方向；信号子空间；随机矩阵理论

HTML PDF 收藏

利用子空间的投影和跟踪改进OFDM信道估计

董亮,曹秀英,毕光国

《中国工程科学》 2006年第8卷第11期页码 86-93

摘要：

OFDM系统的LS信道估计可看作真实信道频率响应的一个有噪观察值，因此可采用子空间投影方法对噪声进行压缩。分析了利用子空间投影方法改进LSOFDM信道估计性能的实质，给出了利用子空间投影改进OFDM信道估计的一般框架，在此基础上将子空间投影推广到非LS信道估计方法。当信号子空间随时间变化时，需要采用子空间跟踪技术保持对信号子空间的良好估计，因此提出了一种基于子空间跟踪的参数化信道估计方法，仿真表明这种方法在性能上优于非参数化时的相应方法。

关键词： OFDM 子空间投影跟踪信道估计

HTML PDF 收藏

基于投影寻踪的组合评价方法研究

王硕, 杨善林, 胡笑旋

《中国工程科学》 2008年第10卷第8期页码 60-64

摘要：

以理想解法和灰色关联度分析法为基础进行组合，得到的组合评价方法能够提高评价结果的有效性。在该组合评价方法的研究中，常规的作法是对指标组合权重的运用主观赋值法，组合的偏好系数、灰色关联度的分辨系数采取人为赋值法，没能充分挖掘组合评价方法的优势。针对此问题，提出用投影寻踪法构建处理组合评价法的优化模型，运用实码加速遗传算法处理该非线性优化问题，所得的指标权重为客观权重，同时得到确定组合评价法组合偏好系数和灰色关联度分辨系数的新方法。实例表明，基于投影寻踪的组合评价方法具有科学性和客观性。

关键词：组合评价投影寻踪法实码加速遗传算法分辨系数组合偏好系数

HTML PDF 收藏

基于子空间的离散时滞系统辨识 Article

Qiang LIU,Jia-chen MA

《信息与电子工程前沿（英文）》 2016年第17卷第6期页码 566-575 doi: 10.1631/FITEE.1500358

摘要：本文研究了具有未知时延的线性随机时滞系统的辨识问题。时滞系统被表达为具有单一时延的时滞差分方程。首先利用状态增广方法将时滞系统转化为一个等价的线性时不变系统，然后采用传统的子空间辨识方法来估计增广系统矩阵。本文提出了一种ACS算法，从而得到时滞系统的状态空间模型。最后，基于ACS算法得到的相似变换，重新得到卡尔曼状态序列。采用最小二乘法，利用卡尔曼状态序列和输入输出数据，得出相同状态空间下的时滞系统矩阵。仿真结果表明了这种算法的有效性。

关键词：辨识问题；时滞系统；子空间辨识方法；ACS算法；最小二乘法

HTML PDF 收藏

Coordinate system applied to magnetic suspension project between Shanghai and Hangzhou

SHI Yimin, WANG Lihua, LUO Yan

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 288-292 doi: 10.1007/s11709-008-0041-7

摘要： In order to satisfy the requirement for route location of a magnetic suspension project between Shanghai and Hangzhou, this paper proposes to adopt a new form of geodetic coordinate system, which is defined by meridians and parallel circles but with two coordinate parameters expressed by length. Not only the coordinate systems for route location along the whole line can be unified, but also the precision of lengths and angles obtained from simple formulas are very high and there are not any map projection distortions. This has been proven by calculation.

关键词： requirement projection calculation Shanghai precision

HTML PDF 收藏

高临场感多投影面虚拟环境系统的设计与实现

贾庆轩,宋荆洲,孙汉旭,高欣,姚福生

《中国工程科学》 2006年第8卷第8期页码 33-38

摘要：

给出了高临场感多投影面虚拟环境系统的体系结构，研究了系统构建中的立体显示、图形分割、画面同步、几何校正、颜色校正等关键问题；采用基于联网PC驱动的技术、利用中低端的投影机和低性能网络设备，构建了一个五通道的220度宽视场角多投影面虚拟环境应用验证系统，获得了良好的画面整体一致性效果和高度的沉浸感。

关键词：多投影面画面同步立体显示几何校正颜色校正

HTML PDF 收藏

透视投影下的非朗伯光度立体技术 Research Articles

李敏1,刁常宇2,许端清1,邢卫1,鲁东明1

《信息与电子工程前沿（英文）》 2020年第21卷第8期页码 1119-1266 doi: 10.1631/FITEE.1900156

摘要：在透视投影假设下，非朗伯光度立体技术是一个高度非线性问题。本文提出一种透视投影下基于非朗伯反射模型的表面法线和深度重构优化框架。将图像分解为漫反射分量和镜面分量，可同时计算表面法向量和反射率。此外提出一个变分公式，其在表面重构中表现出鲁棒性与有益性。实验结果表明，所提方法能准确重构非朗伯曲面彩色物体表面形状并计算出物体表面的反射率。

关键词：光度立体法；三维重构；透视投影；图像分解

HTML PDF 收藏

一种基于两步参数子空间模型的对比度保持彩色图像灰度化算法 Article

Hong-yang LU, Qie-gen LIU, Yu-hao WANG, Xiao-hua DENG

《信息与电子工程前沿（英文）》 2017年第18卷第11期页码 1874-1882 doi: 10.1631/FITEE.1600017

摘要： rgb2gray转换模型是目前最为经典和流行的彩色图像灰度化方法。最新的研究表明，对一阶线性模型的三个加权参数进行自适应离散搜索具有良好的潜力。在本文中，我们提出一种两步法方式，将参数搜索策略扩充到二阶多变量多项式模型。该模型划分为三个子空间的和，本文论证了第一个子空间是最为重要的，并且第二个子空间可以看作为对其进行加细的部分。在模型的第一步，将梯度相似性测度（gradient correlation similarity, Gcs）用于第一个子空间，得到一个初步的灰度化图像。然后，再次使用Gcs对初步灰度图像和第二子空间所引出形成的候选图像进行最优解搜索。通过数值实验，在定量评价、定性视觉评价和算法复杂度方面表明了本方法的有效性。

关键词：彩色图像灰度化；子空间建模；二阶多项式模型；梯度相关相似；离散搜索

HTML PDF 收藏

Impact of household transitions on domestic energy consumption and its applicability to urban energy planning

Benachir MEDJDOUB, Moulay Larbi CHALAL

《工程管理前沿（英文）》 2017年第4卷第2期页码 171-183 doi: 10.15302/J-FEM-2017029

摘要： The household sector consumes roughly 30% of Earth’s energy resources and emits approximately 17% of its carbon dioxide. As such, developing appropriate policies to reduce the CO emissions, which are associated with the world’s rapidly growing urban population, is a high priority. This, in turn, will enable the creation of cities that respect the natural environment and the well-being of future generations. However, most of the existing expertise focuses on enhancing the thermal quality of buildings through building physics while few studies address the social and behavioral aspects. In fact, focusing on these aspects should be more prominent, as they cause between 4% and 30% of variation in domestic energy consumption. Premised on that, the aim of this study was to investigate the effect in the context of the UK of household transitions on household energy consumption patterns. To achieve this, we applied statistical procedures (e.g., logistic regression) to official panel survey data comprising more than 5500 households in the UK tracked annually over the course of 18 years. This helped in predicting future transition patterns for different household types for the next 10 to 15 years. Furthermore, it enabled us to study the relationship between the predicted patterns and the household energy usage for both gas and electricity. The findings indicate that the life cycle transitions of a household significantly influence its domestic energy usage. However, this effect is mostly positive in direction and weak in magnitude. Finally, we present our developed urban energy model “EvoEnergy” to demonstrate the importance of incorporating such a concept in energy forecasting for effective sustainable energy decision-making.

关键词： urban energy planning household transitions smart cities energy forecasting household projection serious gaming

HTML PDF 收藏

利用两类投影方法进行特征融合的人脸识别

张生亮,徐勇,杨健,杨静宇

《中国工程科学》 2006年第8卷第8期页码 50-55

摘要：

提出了利用两类投影抽取特征、用并行策略融合特征进行人脸识别的新方法。先用一维的基于向量的投影抽取一组特征，再用基于二维的图像投影的方法抽取一组特征，用复向量将样本的两组特征向量组合在一起，在复向量空间分析主分量(CPCA)，抽取人脸图像的鉴别特征。在FERET人脸库上的实验结果表明，该方法的识别性能比用单个特征有10%左右的提高。

关键词：特征融合线性鉴别分析(LDA) 特征抽取人脸识别

HTML PDF 收藏

Actor-Critic强化学习算法及其在开发基于计算机视觉的界面跟踪中的应用 Article

Oguzhan Dogru, Kirubakaran Velswamy, 黄彪

《工程（英文）》 2021年第7卷第9期页码 1248-1261 doi: 10.1016/j.eng.2021.04.027

摘要：

本文通过将对象跟踪形式化为序列决策过程，使控制理论与计算机视觉实现同步。强化学习（RL）智能体成功跟踪了两种液体之间的界面，这通常是化学、石化、冶金和石油行业中跟踪的关键变量。该方法使用少于100 张图像来创建环境，智能体无需专家知识即可从中生成自己的数据。与依赖大量参数的监督学习（SL）方法不同，这种方法需要的参数少得多，这自然降低了维护成本。除了经济性外，该智能体还对环境不确定性（如遮挡、强度变化和过度噪声）具有鲁棒性。在闭环控制情境下，基于界面位置的偏差被选作训练阶段的优化目标。该方法展示了RL方法在油砂行业中的实时对象跟踪应用。本文除了介绍界面跟踪问题外，还详细回顾了最有效的RL方法之一——actor-critic策略。

关键词：界面跟踪对象跟踪遮挡强化学习均匀流形逼近和投影

HTML PDF 收藏

Subspace transform induced robust similarity measure for facial images

Jian Zhang, Heng Zhang, Li-ling Bo, Hong-ran Li, Shuai Xu, Dong-qing Yuan,zhangjian@jou.edu.cn,zhangheng@jou.edu.cn

《信息与电子工程前沿（英文）》 2020年第21卷第9期页码 1267-1412 doi: 10.1631/FITEE.1900552

摘要： Similarity measure has long played a critical role and attracted great interest in various areas such as and machine perception. Nevertheless, there remains the issue of developing an efficient two-dimensional (2D) robust similarity measure method for images. Inspired by the properties of subspace, we develop an effective 2D technique, named transformation similarity measure (TSM), for robust . Specifically, the TSM method robustly determines the similarity between two well-aligned frontal facial images while weakening interference in the by linear transformation and singular value decomposition. We present the mathematical features and some odds to reveal the feasible and robust measure mechanism of TSM. The performance of the TSM method, combined with the nearest neighbor rule, is evaluated in under different challenges. Experimental results clearly show the advantages of the TSM method in terms of accuracy and robustness.

HTML PDF 收藏

标题作者时间类型操作

monitoring of non-gaussian chemical processes with modes-switching using globality-locality preserving projection

Xin Peng, Yang Tang, Wenli Du, Feng Qian

期刊论文

Finite element model updating of a large structure using multi-setup stochastic subspace identification

Reza KHADEMI-ZAHEDI, Pouyan ALIMOURI

期刊论文

Multiple fault separation and detection by joint subspace learning for the health assessment of wind

Zhaohui DU, Xuefeng CHEN, Han ZHANG, Yanyang ZI, Ruqiang YAN

期刊论文

基于随机矩阵理论的子空间加权改良算法