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Guaranteeing almost fault-free tracking performance from transient to steady-state:a disturbance observer approach

Science China(Information Sciences) 2018年第7期61卷 227-243页

作者： Gyunghoon PARK Hyungbo SHIM asri Department of Electrical and Computer Engineering Seoul National University

In this paper, we propose an output-feedback fault-tolerant controller(FTC) for a class of uncertain multi-input single-output systems under float and lock-in-place actuator faults. Of particular interest is to recover a fault-free tracking performance of a(pre-defined) nominal closed-loop system, during the entire time period including the transients due to abrupt actuator faults. As a key component, a highgain disturbance observer(DOB) is employed to rapidly compensate the lumped disturbance, a compressed expression of all the effect of actuator faults(as well as model uncertainty and disturbance) on the *** implement this high-gain approach, a fixed control allocation(CA) law is presented in order to keep an extended system with a virtual scalar input to remain of minimum phase under any patterns of faults. It is shown via the singular perturbation theory that the proposed FTC, consisting of the high-gain DOB and the CA law, resolves the problem in an approximate but arbitrarily accurate sense. Simulations with the linearized lateral model of Boeing 747 are performed to verify the validity of the proposed FTC scheme.

关键词： disturbance observer fault-tolerant control robust control performance recovery actuator fault

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Yet another tutorial of disturbance observer： robust stabilization and recovery of nominal performance

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Control Theory and Technology 2016年第3期14卷 237-249页

作者： Hyungbo SHIM Gyunghoon PARK Youngjun JOO Juhoon BACK Nam Hoon JO asri Department of Electrical and Computer Engineering Seoul National University Korea Department of Electrical Engineering and Computer Science University of Central Florida U.S.A. School of Robotics Kwangwoon University Korea Department of Electrical Engineering Soongsil University Korea

This paper presents a tutorial-style review on the recent results about the disturbance observer （DOB） in view of robust stabilization and recovery of the nominal performance. The analysis is based on the case when the bandwidth of Q-filter is large, and it is explained in a pedagogical manner that, even in the presence of plant uncertainties and disturbances, the behavior of real uncertain plant can be made almost similar to that of disturbance-free nominal system both in the transient and in the steady-state. The conventional DOB is interpreted in a new perspective, and its restrictions and extensions are discussed.

关键词： Disturbance observer robust stabilization robust transient response disturbance rejection

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Sustainability criteria of apicultural industry:evidence from Iran

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Ecosystem Health and Sustainability 2020年第1期6卷 617-629,616页

作者： Mohammad Kazem Rahimi Enayat Abbasi Masoud Bijani Gholamhosein Tahmasbi Ali Akbar Azimi Dezfouli Department of Agricultural Extension and Education College of AgricultureTarbiat Modares University(TMU)TehranIran Animal Science Research Institute(asri) Agricultural ResearchEducation and Extension Organization(AREEO)KarajIran Agricultural Planning Economicsand Rural Development Research Institute(APERDRI)Ministry of Agriculture-JihadTehranIran

This study aimed to determine the sustainability criteria of the beekeeping industry in Iran,which was performed using three-stage classical Delphi *** participants were 32 experts in beekeeping industry who were purposefully selected using the snowball sampling *** criteria identified,after three Delphi stages,consisted of 70 items,which were categorized into 13 general criteria and into four economic,environmental,social,and institutional *** general criteria were presented in the form of a conceptual model,including:farmers’environmental behavior quality,beekeepers'environmental behavior quality,the quality of marketing and sales of beekeeping productions,productivity and performance improvement,amount of monetization from pollinations'right,the amount of monetization of byproducts and value added,employment rate and job stability,the level of social development of stakeholders,the quality of the role-playing of non-governmental stakeholders,the quality of extension and education new sciences and technologies to stakeholders,comprehensiveness of laws and programs,quality of role-playing of stakeholder non-governmental organizations,and the quality of the roleplaying of governmental institutions *** them,a comprehensive perception of the necessary criteria for the sustainability of Iran's beekeeping industry can be obtained and a comprehensive program can be designed for its implementation.

关键词： Sustainable apiculture agricultural sustainability conceptual model Delphi technique

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缝纫技术在建筑组件连接中的实用研究

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河北建筑工程学院学报 2020年第1期38卷 101-105页

作者：张珺琢 AS国际建筑与空间研究所(asri) 北京100000

对缝纫技术在建筑学领域中的应用进行综合的分析。缝纫作为建筑设计中新型的连接方式,可作为二次加固的连接方式使用,并结合不同类型的材料,在连接之后使整体更具韧性和弹性,可以使结构整体更加灵活。同时利用缝纫技术提出了一种新的数... 详细信息

对缝纫技术在建筑学领域中的应用进行综合的分析。缝纫作为建筑设计中新型的连接方式,可作为二次加固的连接方式使用,并结合不同类型的材料,在连接之后使整体更具韧性和弹性,可以使结构整体更加灵活。同时利用缝纫技术提出了一种新的数字化建模逻辑。在这种逻辑下的建模过程更加整体化,精确化。

关键词：缝纫时尚设计建筑设计连接系统

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