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 359

年份

2024 1

2023 27

2022 34

2021 43

2020 29

2019 24

2018 18

2017 18

2016 21

2015 15

2014 9

2013 9

2012 7

2011 5

2010 17

2009 16

2008 9

2007 13

2006 8

2005 3

展开︾

关键词

光纤通信 3

分布式系统 3

光纤传感技术 2

分布式优化 2

整体穿刺 2

玻璃钢 2

纤维 2

10kV高压电力电缆 1

5% 法 1

AF/PSTM 1

ANSYS 1

CAN总线 1

DPP）；分布式功率转换器；开关电容转换器 1

FRP 聚合物 1

GPS轨迹 1

Gossip模型 1

HLA/RTI 1

KTP 1

MPPT）；差分功率处理（Differential power processing 1

展开︾

检索范围：

排序：展示方式：

Distributed fiber optic monitoring of a CFA pile with a central reinforcement bar bundle

Yi RUI, Nicholas de BATTISTA, Cedric KECHAVARZI, Xiaomin XU, Mei YIN

《结构与土木工程前沿（英文）》 2021年第15卷第1期页码 167-176 doi: 10.1007/s11709-020-0581-z

摘要： In this paper, we present an application of distributed fiber optic sensor (DFOS) technology to measure the strain of a continuous flight auger (CFA) test pile with a central reinforcement bar bundle, during a static load test carried out in London. Being distributed in nature, DFOS gives much more information about the pile performance as compared to traditional point sensors, such as identifying cross-sectional irregularities or other anomalies. The strain profiles recorded along the depth of the piles from the DFOS were used to calculate pile deformation (contraction), shaft friction, and tip resistance under various loads. Based on this pile load test, a finite element (FE) analysis was performed using a one-dimensional nonlinear load-transfer model. Calibrated by the shaft friction and tip resistance derived from the monitored data, the FE model was able to simulate the pile and soil performance during the load testing with good accuracy. The effect of the reinforcement cage and central reinforcement bar bundle were investigated, and it was found that the addition of a reinforcement cage would reduce the pile settlement by up to 20%.

关键词： continuous flight auger pile static load test central reinforcement bar bundle distributed fiber optic sensor finite element load transfer

HTML PDF 收藏

Structural health monitoring with fiber optic sensors

F. ANSARI

《机械工程前沿（英文）》 2009年第4卷第2期页码 103-110 doi: 10.1007/s11465-009-0032-y

摘要： Optical fiber sensors have been successfully implemented in aeronautics, mechanical systems, and medical applications. Civil structures pose further challenges in monitoring mainly due to their large dimensions, diversity and heterogeneity of materials involved, and hostile construction environment. This article provides a summary of basic principles pertaining to practical health monitoring of civil engineering structures with optical fiber sensors. The issues discussed include basic sensor principles, strain transfer mechanism, sensor packaging, sensor placement in construction environment, and reliability and survivability of the sensors.

关键词： Bridges structural health monitoring smart skins cracks strains displacements fiber optic sensors FBG structures

HTML PDF 收藏

Digitalization optical open loop test system for fiber optic gyroscope

ZHANG Deng-wei, SHU Xiao-wu, MU Xu-dong, LIU Cheng

《机械工程前沿（英文）》 2006年第1卷第4期页码 434-438 doi: 10.1007/s11465-006-0053-8

摘要： In order to receive and process the open loop signal from fiber optic gyroscopes speedily, stably and expediently, and to realize the amity interface between human and machine, a digital system that can convert GPIB (general purpose interface bus ) parallel bus into Universal Serial Bus is developed. All the interface functions of GPIB and the hardware system are realized through FPGA. With a digital sampling and processing system designed with VC++ in Windows platform, the real-time controlling procedure, high-speed receiving and sending data can be carried out, and the results can be displayed too. So the design of the system is flexible, the reliability and the stability are improved, error rate is no more than 10, the highest bit rate is 8 MB/s and the open loop detection system for optic fiber gyros achieves standardization and complete digitalization simultaneously.

关键词： stability real-time controlling standardization controlling procedure complete digitalization

HTML PDF 收藏

A novel decoupling approach to an integrated optical-fiber proximity sensor for robots

LIU Guixiong, LI Xiani

《机械工程前沿（英文）》 2007年第2卷第2期页码 164-167 doi: 10.1007/s11465-007-0027-5

摘要： The structure and the working principle of a self-compensational integrated optical-fiber proximity sensor that detects distance and orientation are introduced in this paper. The corresponding decoupling approach to the sensor is presented on the basis of multiscale characteristics. The decoupling process can be divided into two parts: classifying the information on the basis of the multiscale degree and solving the coupling equation via the computational approximation methods with different precisions. Finally, the principle, the physical meaning, and the implementation process of the approach are discussed. They indicate that the proposed approach is real-time and accurate, and can be applied to other similar circumstances.

关键词： multiscale different self-compensational integrated information implementation

HTML PDF 收藏

Smart optical-fiber structure monitoring based on granular computing

Guan LU, Dakai LIANG,

《机械工程前沿（英文）》 2009年第4卷第4期页码 462-465 doi: 10.1007/s11465-009-0073-2

摘要： Using an optic fiber self-diagnosing system in health monitoring has become an important direction of smart materials and structure research. The buried optic fiber sensor can be used to test the parameters of the composite material. The granular computing method can reach the requirement of damage detection by analyzing digital signals and character signals of the smart structure at the same time. The paper investigates an optic fiber smart layer and presents a method for realizing optic fiber smart structure monitoring and damage detection by using granular computing. After the analysis, it is presumed that optic fiber smart structure monitoring based on granular computation can identify the damage from complex signals.

关键词： smart material and structure GrC optical fiber sensor rough set clustering algorithm

HTML PDF 收藏

Numerical investigation and optimal design of fiber Bragg grating based wind pressure sensor

Xiangjie WANG, Danhui DAN, Rong XIAO, Xingfei YAN

《结构与土木工程前沿（英文）》 2017年第11卷第3期页码 286-292 doi: 10.1007/s11709-017-0415-9

摘要： A wind pressure sensor based on fiber Bragg grating (FBG) for engineering structure was investigated in this paper. We established a transaction model of wind pressure to strain and proposed a method of temperature compensation. By finite element analysis, the basic parameters of the sensor were optimized with the aim of maximum strain under the basic wind pressure proposed in relative design code in China taking geometrical non-linearity into consideration. The result shows that the wind pressure sensor we proposed is well performed and have good sensing properties, which means it is a technically feasible solution.

关键词： wind pressure measurement wind pressure sensor fiber Bragg grating optimal design

HTML PDF 收藏

The effect of orbital radiation therapy on thyroid-associated orbitopathy complicated with dysthyroid optic

null

《医学前沿（英文）》 2017年第11卷第3期页码 359-364 doi: 10.1007/s11684-017-0528-5

摘要：

Thyroid-associated orbitopathy (TAO) is an inflammatory autoimmune disorder. The most serious complication of TAO is dysthyroid optic neuropathy (DON), which can lead to permanent vision loss because of volume expansion in the orbital apex. Orbital radiation therapy (ORT) is an anti-inflammatory treatment used in the treatment of active TAO. Clinical studies support radiotherapy as having a modest effect on DON, and early radiotherapy may protect against disease progression to DON. Current studies suggest that radiotherapy is generally safe. However, risks still exist in some cases. The possible effects of radiotherapy on TAO, especially complicated with DON, are reviewed. The effects of radiotherapy on DON are not completely known, and evidence from standardized, prospective, and multicenter clinical trials is still lacking.

关键词： thyroid-associated orbitopathy dysthyroid optic neuropathy orbital radiation therapy

HTML PDF 收藏

新型硅基光纤研究进展 Special Feature on Optoelectronic Devices and Inte

Ting-yun WANG, Fu-fei PANG, Su-juan HUANG, Jian-xiang WEN, Huan-huan LIU, Li-bo YUAN

《信息与电子工程前沿（英文）》 2019年第20卷第4期页码 481-489 doi: 10.1631/FITEE.1900017

摘要：综述了两类新型光纤的最新研究进展，主要包括掺铋、铝、铈等元素的二氧化硅光纤和微结构多芯光纤。作为掺杂特殊元素的光纤，铋铝共掺杂二氧化硅光纤的荧光光谱波长为1000到1400 nm，半高宽（FWHM）约为150 nm，可用于光纤放大器和激光系统。铈掺杂光纤的激发和发射中心波长分别约为340和430 nm。在纤芯中掺杂高浓度氧化铝的蓝宝石衍生光纤（SDF）经电弧放电加热、冷却处理后可形成莫来石。SDF可进一步开发为能承受1200 °C高温的法布里—珀罗干涉仪，用于高温传感。由于强消逝场，微结构多芯光纤被广泛应用于生物光纤传感、化学测量等领域。同轴芯光纤是一种具有两个同轴双波导纤芯的新型光纤。将光纤端制备成锥状，能产生紧致聚焦光场，可应用于光学捕获和微粒操纵。本文讨论了这些新型光纤的研究进展。

关键词：光纤；光纤器件；基于二氧化硅特种光纤

HTML PDF 收藏

Digital monitoring and health diagnosis for mechanical equipment operation safety based on fiber Bragggrating sensor

Zude ZHOU, Desheng JIANG, Quan LIU

《机械工程前沿（英文）》 2009年第4卷第1期页码 5-14 doi: 10.1007/s11465-009-0011-3

摘要： This paper introduces fiber Bragg grating (FBG) based on a fiber optic grating sensor developed to be embedded on mechanical equipment for digital monitoring and health diagnosis. The theoretical and experimental researches on the new-style FBG sensor (FBGS) technology, high-speed demodulation, and data transmission are discussed. The transmission characteristics between the FBG and the detection interface, modeling and compensation method for online distributed multi-parameter digital monitoring and methods for data processing, synchronous sampling, and long-term dynamic digital monitoring using embedded technology are also presented. The acquired information by an FBGS can be used for the optimization of maintenance schedules and refinement of mechanical equipment design. It is a challenge to gather real-time data from components working at high speed and in a severe environment of high temperature, high pressure, and high rotation speed. Currently, there are no sensors or technologies available for digital monitoring and health diagnosis under this rigorous situation for use in mechanical engineering operation safety. As a result, this paper introduces an online distributed and integrated digital monitoring system and health diagnosis. The new principle and new method will contribute to modern measurements in science and technology, mechanical engineering, and large mechanical equipment operation safety.

关键词： fiber Bragg grating sensor (FBGS) mechanical equipment operation safety embedded technology high-speed demodulation digital monitoring health diagnosis

HTML PDF 收藏

采用分布式光纤传感技术的土坝模型渗漏监测分析

朱萍玉,蒋桂林,冷元宝

《中国工程科学》 2011年第13卷第3期页码 82-85

摘要：

建立了采用分布式光纤传感技术的模拟堤坝渗漏监测系统，用来人工模拟土坝渗漏，并得到该种情况下测试光纤长度上的应变图，验证了采用分布式光纤传感技术监测土坝的可行性；运用ANSYS软件建立与试验模型相对应的有限元分析模型，通过选择合适单元，简化边界条件，对一定的工况进行加载分析，得出载荷与应变的关系，以及载荷与塌陷土层重量的关系。文中方法和结论有助于进一步定量研究土坝渗漏大小程度和光纤传感器的合适埋设深度。

关键词：光纤传感技术土坝模型监测应变 ANSYS

HTML PDF 收藏

Biomedical sensor technologies on the platform of mobile phones

Lin LIU, Jing LIU

《机械工程前沿（英文）》 2011年第6卷第2期页码 160-175 doi: 10.1007/s11465-011-0216-0

摘要：

Biomedical sensors have been widely used in various areas of biomedical practices, which play an important role in disease detection, diagnosis, monitoring, treatment, health management, and so on. However, most of them and their related platforms are generally not easily accessible or just too expensive or complicated to be kept at home. As an alternative, new technologies enabled from the mobile phones are gradually changing such situations. As can be freely available to almost everyone, mobile phone offers a unique way to improve the conventional medical care through combining with various biomedical sensors. Moreover, the established systems will be both convenient and low cost. In this paper, we present an overview on the state-of-art biomedical sensors, giving a brief introduction of the fundamental principles and showing several new examples or concepts in the area. The focus was particularly put on interpreting the technical strategies to innovate the biomedical sensor technologies based on the platform of mobile phones. Some challenging issues, including feasibility, usability, security, and effectiveness, were discussed. With the help of electrical and mechanical technologies, it is expected that a full combination between the biomedical sensors and mobile phones will bring a bright future for the coming pervasive medical care.

关键词： biomedical sensor pervasive technology mobile phone combined system health management

HTML PDF 收藏

Development and testing of a wireless smart toolholder with multi-sensor fusion

《机械工程前沿（英文）》 2023年第18卷第4期 doi: 10.1007/s11465-023-0774-y

摘要： The smart toolholder is the core component in the development of intelligent and precise manufacturing. It enables in situ monitoring of cutting data and machining accuracy evolution and has become a focal point in academic research and industrial applications. However, current table and rotational dynamometers for milling force, vibration, and temperature testing suffer from cumbersome installation and provide only a single acquisition signal, which limits their use in laboratory settings. In this study, we propose a wireless smart toolholder with multi-sensor fusion for simultaneous sensing of milling force, vibration, and temperature signals. We select force, vibration, and temperature sensors suitable for smart toolholder fusion to adapt to the cutting environment. Thereafter, structural design, circular runout, dynamic balancing, static stiffness, and dynamic inherent frequency tests are conducted to assess its dynamic and static performance. Finally, the smart toolholder is tested for accuracy and repeatability in terms of force, vibration, and temperature. Experimental results demonstrate that the smart toolholder accurately captures machining data with a relative deviation of less than 1.5% compared with existing force gauges and provides high repeatability of milling temperature and vibration signals. Therefore, it is a smart solution for machining condition monitoring.

关键词： wireless smart toolholder multi-sensor fusion circular runout dynamic balancing static stiffness dynamic inherent frequency

HTML PDF 收藏

Flexible micro flow sensor for micro aerial vehicles

Rong ZHU, Ruiyi QUE, Peng LIU

《机械工程前沿（英文）》 2017年第12卷第4期页码 539-545 doi: 10.1007/s11465-017-0427-0

摘要：

This article summarizes our studies on micro flow sensors fabricated on a flexible polyimide circuit board by a low-cost hybrid process of thin-film deposition and circuit printing. The micro flow sensor has merits of flexibility, structural simplicity, easy integrability with circuits, and good sensing performance. The sensor, which adheres to an object surface, can detect the surface flow around the object. In our study, we install the fabricated micro flow sensors on micro aerial vehicles (MAVs) to detect the surface flow variation around the aircraft wing and deduce the aerodynamic parameters of the MAVs in flight. Wind tunnel experiments using the sensors integrated with the MAVs are also conducted.

关键词： micro flow sensor flexible sensor surface flow sensing aerodynamic parameter micro aerial vehicle (MAV)

HTML PDF 收藏

Fault diagnosis of axial piston pumps with multi-sensor data and convolutional neural network

《机械工程前沿（英文）》 2022年第17卷第3期 doi: 10.1007/s11465-022-0692-4

摘要： Axial piston pumps have wide applications in hydraulic systems for power transmission. Their condition monitoring and fault diagnosis are essential in ensuring the safety and reliability of the entire hydraulic system. Vibration and discharge pressure signals are two common signals used for the fault diagnosis of axial piston pumps because of their sensitivity to pump health conditions. However, most of the previous fault diagnosis methods only used vibration or pressure signal, and literatures related to multi-sensor data fusion for the pump fault diagnosis are limited. This paper presents an end-to-end multi-sensor data fusion method for the fault diagnosis of axial piston pumps. The vibration and pressure signals under different pump health conditions are fused into RGB images and then recognized by a convolutional neural network. Experiments were performed on an axial piston pump to confirm the effectiveness of the proposed method. Results show that the proposed multi-sensor data fusion method greatly improves the fault diagnosis of axial piston pumps in terms of accuracy and robustness and has better diagnostic performance than other existing diagnosis methods.

关键词： axial piston pump fault diagnosis convolutional neural network multi-sensor data fusion

HTML PDF 收藏

Organizational dynamics in adaptive distributed search processes: effects on performance and the role

Friederike WALL

《信息与电子工程前沿（英文）》 2016年第17卷第4期页码 283-295 doi: 10.1631/FITEE.1500306

摘要： In this paper, the effects of altering the organizational setting of distributed adaptive search processes in the course of search are investigated. We put particular emphasis on the complexity of interactions between partial search problems assigned to search agents. Employing an agent-based simulation based on the framework of NK landscapes we analyze different temporal change modes of the organizational set-up. The organizational properties under change include, for example, the coordination mechanisms among search agents. Results suggest that inducing organizational dynamics has the potential to increase the effectiveness of distributed adaptive search processes with respect to various performance measures like the final performance achieved at the end of the search, the chance to find the optimal solution of the search problem, or the average performance per period achieved during the search process. However, results also indicate that the mode of temporal change in conjunction with the complexity of the search problem considerably affects the order of magnitude of these beneficial effects. In particular, results suggest that organizational dynamics induces a shift towards more exploration, i.e., discovery of new areas in the fitness landscape, and less exploitation, i.e., stepwise improvement.

关键词： Agent-based simulation Complexity Coordination Distributed search NK landscapes