检索结果-内蒙古大学图书馆

2nd International Conference on systems and Informatics (ICSAI)

作者： Zhao, WenHui Dong, YuHui Harbin Engn Univ Dept Sci Harbin Peoples R China

ISBN: (纸本)9781479954582

After selecting proper frequency tracking method and designing of the Digital Automatic Frequency Tracking (DAFT) system, a closed-loop system of Cesium atomic magnetometer is implemented. Some characteristics of the closed-loop system are analyzed in detail through experiments. Experiment results show that the peak to peak jitter is no more than 3pT within 1 minute and 9pT within 1 hour, the closed-loop sensitivity is 0.12pT/Hz(1/2), and the response bandwidth is only 1.2Hz in 3dB.

关键词： Cesium atomic magnetometer closed-loop system Digital Automatic Frequency Tracking (DAFT)

来源：评论

学校读者我要写书评

暂无评论

Enhance GO methodology for reliability analysis of the closed-loop system using Cyclic Bayesian Networks

引用

MECHANICAL systemS AND SIGNAL PROCESSING 2018年 113卷 237-252页

作者： Li, Kanjing Ren, Yi Fan, Dongming Liu, Linlin Wang, Zili Ma, Zheng Beihang Univ Sch Reliabil & Syst Engn Beijing 100191 Peoples R China

GO methodology is a success-oriented method for reliability analysis of complex safety critical system, which existing in various fields, such as aircraft carrier, nuclear plant, petrochemical plant, etc. However, the traditional GO methodology is insufficient in modeling the system with feedback signals, which are common in those systems. The challenge lies in modeling the closed-loop feedback process and its algorithms. To address this issue, an approach based on Cyclic Bayesian Networks (CBNs) is presented in this paper to enhance its capability of feedback modeling. In the approach, Type 9 operator is the key element to be introduced to simulate a component with feedback signal, and then the GO model can be cyclic to represent a system with feedback loops;furthermore, we compare the decision capability of the GO and BN methodologies in dynamic structure and uncertainty handling. Considering the complexity of the analysis of the GO method, the cyclic GO model is mapped to its corresponding CBNs according to some mapping rules. And leveraging matured algorithms and toolkit of BNs, we can not only obtain the probability of each node in each state via failure propagation, but also identify critical events given the event occurrence via backward reasoning. Eventually, a case of chemical treatment tank liquid level controlling minus-feedback system is analyzed to demonstrate the approach's feasibility, and by enhancing the capability with loop structured system modeling, the approach makes GO methodology more practical in more modern complex engineering systems with feedback loops. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： closed-loop system GO methodology Reliability analysis Cyclic Bayesian Networks

来源：评论

学校读者我要写书评

暂无评论

Socio-economic impacts of the COVID-19 pandemic on waste bank closed-loop system in Surabaya, Indonesia

引用

WASTE MANAGEMENT & RESEARCH 2021年第8期39卷 1039-1047页

作者： Warmadewanthi, Idaa Wulandari, Dwi Cahyadi, Mokhamad Nur Pandebesie, Ettina Sitepu Anityasari, Maria Dwipayanti, Ni Made Utami Purnama, I. Gede Herry Nisaa, Ainul Firdatun Inst Teknol Sepuluh Nopember Dept Environm Engn Surabaya Indonesia Inst Teknol Sepuluh Nopember Res Ctr Infrastruct & Sustainable Environm Surabaya Indonesia Inst Teknol Sepuluh Nopember Res Ctr Maritime & Earth Sci Surabaya Indonesia Udayana Univ Bukit Jimbaran Bali Indonesia

The COVID-19 pandemic has caused most waste recycling activities to be terminated due to several factors, such as concerns about the spread of coronavirus through the collected solid waste. This study investigates the socio-economic impact of the situation of the closed-loop system of solid waste recycling. Several recommendations for tackling this problem are presented in this research. Primary data collection for the waste bank and informal recycling sector was carried out in the eastern part of Surabaya during large-scale social restrictions. In-depth interviews were conducted with waste bank customers, waste bank unit representatives and the informal recycling sector to understand the pandemic's socio-economic impact on the closed-loop system. Results show that this pandemic has significant impacts on individuals and stakeholders engaged in waste recycling activities. Customers of waste banks, who mostly belong to low-income communities, mentioned that the waste bank closure gave rise to social and economic problems, such as increasing unmanaged solid waste and decreasing income. This result also applied to the informal recycling sector. The government can use the recommendations in this study to generate related policies, such as enforcing the health protocol within solid waste management to keep the recycling system in place and the business alive.

关键词： closed-loop system COVID-19 informal recycling sector management solid waste waste bank

来源：评论

学校读者我要写书评

暂无评论

A bias correction method for fractional closed-loop system identification

引用

JOURNAL OF PROCESS CONTROL 2015年 33卷 25-36页

作者： Yakoub, Z. Chetoui, M. Amairi, M. Aoun, M. Univ Gabes Natl Engn Sch Gabes Tunisia Res Unit Modeling Anal & Control Syst MAC Gabes Tunisia

In this paper, the fractional closed-loop system identification using the indirect approach is presented. A bias correction method is developed to deal with the bias problem in the continuous-time fractional closed-loop system identification. This method is based on the least squares estimator combined with the state variable filter approach. The basic idea is to eliminate the estimation bias by adding a correction term in the least squares estimates. The proposed algorithm is extended, using a nonlinear optimization algorithm, to estimate both coefficients and commensurate-order of the process. Numerical example shows the performances of the fractional order bias eliminated least squares method via Monte Carlo simulations. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： closed-loop system Commensurate-order Fractional differentiation Least squares State variable filter system identification

来源：评论

学校读者我要写书评

暂无评论

Subspace-Aided closed-loop system Identification With Application to DC Motor system

引用

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2020年第3期67卷 2304-2313页

作者： Li, Kuan Luo, Hao Yang, Chengming Yin, Shen Harbin Inst Technol Dept Control Sci & Engn Harbin 150001 Heilongjiang Peoples R China

A novel closed-loop numerical algorithm for subspace state space system identification (CN4SID) is proposed in this paper. Different from standard schemes, CN4SID algorithm can extend the standard LQ decomposition to the closed-loop cases by incorporating the controller information. Moreover, the proposed method can deliver unbiased pole estimation in the closed-loop framework. To this end, CN4SID algorithm shows superior pole estimation performance compared with a class of subspace identification method via principal component analysis algorithms. The effectiveness of the proposed CN4SID algorithm is finally verified through a practical dc motor system.

关键词： Estimation Mathematical model closed loop systems Standards Instruments DC motors Aerospace electronics closed-loop system dc motor system subspace method system identification

来源：评论

学校读者我要写书评

暂无评论

Nonlinear oscillator design based on phase reduction method for closed-loop system

引用

INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING 2022年第8期36卷 1958-1997页

作者： Hongu, Junichi Iba, Daisuke Tottori Univ Mech & Phys Engn 4-101 Koyama Cho Minami Tottori Tottori Japan Kyoto Inst Technol Mech Engn Kyoto Japan

To widely utilize the synchronization properties of nonlinear oscillators in the control and signal processing engineering field, a common design method for a nonlinear oscillator model would be helpful. The output response of a nonlinear oscillator excited by a periodic signal implicitly includes the information of both the instantaneous phase and the amplitude of the input signal. Explicitly expressing the dynamics of both phase and amplitude with the phase reduction method, and organizing them by the number of events in one period, could enable the design of a nonlinear oscillator model in the same manner that can synchronize with an arbitrary cyclic phenomenon in a broad sense. Assuming the cyclic phenomenon is a single periodic signal, the property of the generalized nonlinear oscillator model has the role as a common-dimensional observer to attain the pseudo-property of both iso-damping and flat-gain. Thus, this article determines the essential role of the nonlinear oscillator inserted in the closed-loop system through investigating the input-output characteristic of the generalized nonlinear oscillator model. As a result of the numerical simulation using a simple vibration excitation and suppression system, it was found that using the generalized nonlinear oscillator model enables us to easily build the closed-loop system including the pseudo-property of both iso-damping and flat-gain.

关键词： closed-loop system flat-gain iso-damping nonlinear oscillator phase reduction method

来源：评论

学校读者我要写书评

暂无评论

Interval finite element method for dynamic response of closed-loop system with uncertain parameters

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2007年第5期70卷 543-562页

作者： Zhang, Xiao Ming Ding, Han Chen, Su Huan Shanghai Jiao Tong Univ Sch Mech Engn Shanghai 200030 Peoples R China Jilin Univ Dept Mech Changchun 130025 Peoples R China

In practical engineering, it is difficult to obtain all possible solutions of dynamic responses with sharp bounds even if an optimum scheme is adopted where there are many uncertain parameters. In this paper, using the interval finite element (IFE) method and precise time integration (PTI) method, we discuss the dynamic response of vibration control problem of structures with interval parameters. With matrix perturbation theory and interval arithmetic, the algorithm for estimating upper and lower bounds of dynamic response of the closed-loop system is developed directly from the interval parameters. Two numerical examples are given to illustrate the application of the present method. The example I is used to show the applicability of the present method. The example 2 is used to show the validity of the present method by comparing the results with those obtained by the classical random perturbation method. Copyright (C) 2006 John Wiley & Sons, Ltd.

关键词： matrix perturbation precise time integration interval finite element method closed-loop system upper and lower bounds of responses

来源：评论

学校读者我要写书评

暂无评论

Dual-Rate Control system Extension Using the Null Space of a closed-loop system

引用

IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING 2020年第1期15卷 135-139页

作者： Yasui, Ryota Kawaguchi, Natsuki Sato, Takao Araki, Nozomu Konishi, Yasuo Univ Hyogo Grad Sch Engn 2167 Shosha Himeji Hyogo 6712280 Japan

The present paper discusses a design method for a single-input single-output linear time-invariant dual-rate sampled-data control system, where the sampling interval of a plant output is longer than the holding interval of a control input. In such a control system, intersample output oscillation, called ripple, can occur even if the sampled output converges to the reference input. In order to resolve this problem, two design methods have been proposed such that the existing sampled output response is maintained: an open-loop system design method and a closed-loop system design method. However, the open-loop design method cannot be applied to systems for which the gain matrix of the control input is full rank. On the other hand, the closed-loop design method can be used for such systems, but the sampled output response is maintained only in the steady state. The present study proposes a new closed-loop design method in which ripples are eliminated and both the transient and steady-state responses are maintained. The effectiveness of the proposed method is demonstrated through numerical examples. (C) 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

关键词： dual-rate control system closed-loop system null space intersample output ripple

来源：评论

学校读者我要写书评

暂无评论

No more hypoglycaemia on days with physical activity and unrestricted diet when using a closed-loop system for 12 weeks: A post hoc secondary analysis of the multicentre, randomized controlled Diabeloop WP7 trial

引用

DIABETES OBESITY & METABOLISM 2021年第9期23卷 2170-2176页

作者： Franc, Sylvia Benhamou, Pierre-Yves Borot, Sophie Chaillous, Lucy Delemer, Brigitte Doron, Maeva Guerci, Bruno Hanaire, Helene Huneker, Erik Jeandidier, Nathalie Amadou, Coralie Renard, Eric Reznik, Yves Schaepelynck, Pauline Simon, Chantal Thivolet, Charles Thomas, Claire Hannaert, Patrick Charpentier, Guillaume Sud Francilien Hosp Dept Diabet 40 Ave Serge Dassault F-91100 Corbeil Essonnes France Ctr Etud & Rech Intensificat Traitement Diabet CE Evry France Univ Paris Saclay Lab Biol Exercice Performance & Sante Univ Evry Val dEssonne Inst Rech Biomed Armees Evry France Univ Hosp Grenoble Alpes Dept Diabetol Grenoble France Ctr Hosp Univ Jean Minjoz Dept Endocrinol Metab Diabet & Nutr Besancon France CHU Nantes Hosp Laennec St Herblain France Reims Univ Hosp Dept Endocrinol Diabet & Nutr Reims France Univ Grenoble Alpes Commissariat Energie Atom Lab Elect & Technol Informat Dept Micro Technol Biol & Sante Grenoble France Univ Lorraine Endocrinol Diabet Care Unit Vandoeuvre Les Nancy France Univ Toulouse CHU Toulouse Dept Diabetol Metab Dis & Nutr Toulouse France Diabeloop SA Paris France CHRU Strasbourg UDS Dept Endocrinol Diabet & Nutr Strasbourg France Univ Paris Saclay Orsay France Univ Montpellier Montpellier Univ Hosp Dept Endocrinol Diabet & Nutr Montpellier France Univ Montpellier CNRS Inst Funct Genom INSERM Montpellier France Univ Caen Dept Endocrinol Cote de Nacre Reg Hosp Ctr Caen France Marseille Univ Hosp St Marguerite Hosp Dept Nutr Endocrinol Metab Disorders Marseille France Ctr Hosp Lyon Sud Dept Endocrinol Diabet & Nutr Lyon France Lyon Univ Hosp Ctr Diabet Lyon France INSERM Sch Med & Pharm Poitiers Ischemie Reperfus Transplantat Organes Mecanismes Unite Mixte Rech 1082 Poitiers France

A post hoc analysis of the Diabeloop WP7 multicentre, randomized controlled trial was performed to investigate the efficacy of the Diabeloop Generation-1 (DBLG1) closed-loop system in controlling the hypoglycaemia induced by physical activity (PA) in real-life conditions. Glycaemic outcomes were compared between days with and without PA in 56 patients with type 1 diabetes (T1D) using DBLG1 for 12 weeks. After the patient announces a PA, DBLG1 reduces insulin delivery and, if necessary, calculates the amount of preventive carbohydrates (CHO). Daily time spent in the interstitial glucose range less than 70 mg/dL was not significantly different between days with and without PA (2.0% +/- 1.5% vs. 2.2% +/- 1.1%), regardless of the intensity or duration of the PA. Preventive CHO intake recommended by the system was significantly higher in days with PA (41.1 +/- 35.5 vs. 21.8 +/- 28.5 g/day;P < .0001), and insulin delivery was significantly lower (31.5 +/- 10.5 vs. 34.0 +/- 10.5 U/day;P < .0001). The time spent in hyperglycaemia and the glycaemic variation coefficient increased significantly on days with PA. In real-life conditions, the use of DBLG1 avoids PA-induced hypoglycaemia. Insulin adjustments and preventive CHO recommendation may explain this therapeutic benefit.

关键词： artificial pancreas closed-loop system continuous glucose monitoring glycaemic control hypoglycaemia insulin pump therapy physical activity physical intervention randomized controlled trial type 1 diabetes

来源：评论

学校读者我要写书评

暂无评论

Real-time sensor fault diagnosis method for closed-loop system based on dynamic trend

引用

INTERNATIONAL JOURNAL OF MODELLING IDENTIFICATION AND CONTROL 2019年第2期33卷 98-107页

作者： Na, W. B. Gao, Y. Zhu, T. H. Zheng, X. T. China Jiliang Univ Coll Mech & Elect Engn Hangzhou 310000 Zhejiang Peoples R China

To solve the common problems of sensor fault detection, fault setting and fault location in the first-order closed-loop control system, a static fault diagnosis model based on the real-time trend of dynamic data flow is constructed. Aiming at the common fixed-value system and servo system in the first-order closed-loop control system, a data processing model based on sliding window is designed by collecting and analysing a large amount of real-time data, and the fault is isolated in the window based on the calibration parameters. Then, the adaptive threshold binarisation method is used to calculate the fault vector, and then the analytical model of fault location is obtained by the linear regression method. Finally, the feasibility and validity of closed-loop sensor fault diagnosis method based on dynamic data flow trend are verified by online simulation of "complex process system innovation experimental platform" based on OPC communication technology.

关键词： dynamic trend sliding window sensor fault diagnosis closed-loop system threshold linear regression fault detection fault setting fault location

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：