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ABCLS method for high-reliability aerospace mechanism with truncated random uncertainties

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Chinese Journal of Aeronautics 2015年第4期28卷 1066-1075页

作者： Peng Wensheng Zhang Jianguo Zhu Dantong School of reliability and Systems Engineering Beihang University Science and Technology on reliability and Environment Engineering Laboratory Beihang University

The random variables are always truncated in aerospace engineering and the truncated distribution is more feasible and effective for the random variables due to the limited samples *** high-reliability aerospace mechanism with truncated random variables, a method based on artificial bee colony（ABC） algorithm and line sampling（LS） is *** artificial bee colony-based line sampling（ABCLS） method presents a multi-constrained optimization model to solve the potential non-convergence problem when calculating design point（is also as most probable point, MPP） of performance function with truncated variables; by implementing ABC algorithm to search for MPP in the standard normal space, the optimization efficiency and global searching ability are increased with this method *** calculating the reliability of aerospace mechanism with too small failure probability, the Monte Carlo simulation method needs too large sample *** ABCLS method could overcome this *** reliability problems with implicit functions, this paper combines the ABCLS with Kriging response surface method,therefore could alleviate computational burden of calculating the reliability of complex aerospace mechanism.A numerical example and an engineering example are carried out to verify this method and prove the applicability.

关键词： Artificial bee colony algo-rithm high reliability Kriging model Line sampling Truncated random variables

Technology Improvement for the high reliability LM-2F Launch Vehicle

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Aerospace China 2017年第3期18卷 38-42页

作者： QIN Tong RONG Yi ZHENG Liwei ZHANG Zhi Beijing Institute of Astronautical. Systems Engineering Beijing 10076 China Academy of Launch Vehicle Technology Beijing 100076

The Long March 2 F(LM-2F) launch vehicle, the only launch vehicle designed for manned space flight in China, successfully launched the Tiangong 2 space laboratory and the Shenzhou 11 manned spaceship into orbits in 2016 respectively. In this study, it introduces the technological improvements for enhancing the reliability of the LM-2F launch vehicle in the aspects of general technology, control system, manufacture and ground support system. The LM-2F launch vehicle will continue to provide more contributions to the Chinese Space Station Project with its high reliability and 100% success rate.

关键词： LM-2F launch vehicle technology improvement high reliability

high reliability LM-2F Launch Vehicle for Space Station Mission

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Aerospace China 2022年第1期23卷 12-18页

作者： QIN Tong RONG Yi HU Yanchen LI Wenqing Beijing Institute of Astronautical Systems Engineering Beijing 100076 China Academy of Launch Vehicle Technology Beijing 100076

As China’s only manned launch vehicle,the LM-2 F Launch vehicle successfully launched the Shenzhou 12 manned spacecraft into its predetermined orbit on June 12,2021,signifying the successful completion of the first manned launch mission in the construction and key technology test stage of China Space Station(CSS).From the launch of the Shenzhou 11 manned spacecraft on October 12,2016 to the launch of Shenzhou 12 in 2021,over the past five years,the LM-2 F launch vehicle has been continuously improved in terms of product reliability through technological innovation and design improvement,and its flight reliability index has increased from 0.97 to *** on the new launch mission requirements for the construction stage of CSS,this paper introduces the technological innovation and reliability improvement methods of the LM-2 F from the aspects of design improvement,research methods and process *** LM-2 F launch vehicle will make greater contributions in supporting the construction of CSS with higher reliability and perfect launch success rate.

关键词： space station mission high reliability technological innovation design improvement

high reliable gas sensor based on crystal-facet regulated α-Fe2O3 nanocrystals for rapid detection of exhaled acetone

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Rare Metals 2024年第12期43卷 6500-6515页

作者： Jin-Yong Hu Hong Lei Hong-Yu Zhang Xiong-Xiong Xue Xin-Peng Wang Cong-Hui Wang Yong Zhang School of Physics and Optoelectronics Xiangtan University School of Chemistry and Chemical Engineering Henan University of Technology Hunan Institute of Advanced Sensing and Information Technology Xiangtan University

The exploitation of the highly reliable gassensing device for exhaled acetone detection possesses momentous and capacious development prospects in the field of an early noninvasive diabetes *** that the characteristics of crystal facets will impact the gas-sensitive performance,herein three different resistive gas sensors were successfully developed by utilizing the stable α-Fe2O3with different crystal facets as the sensitive *** gas-sensitive performance testing results reveal that the（110） crystal faceted α-Fe2O3sensor exhibits relatively superior comprehensive gas sensitivity toward ***,it is worth mentioning that the sensor demonstrates reliable sensitivity,rapid response（25 s）/recovery（3 s） speed,and strong anti-interference capability in detecting 2×10-6acetone for the concentration threshold of diabetes,even when exposed to prolonged periods in variable ***,by simply validating the feasibility of the exhalation diagnosis using the as-prepared gas sensor,the（110） faceted α-Fe2O3gas sensor can effectively discriminate the states of healthy human exhalation and the simulated diabetic *** integrating the experimental and theoretical analyses,the superior acetone-sensitive performance of the（110） faceted α-Fe2O3gas sensor can principally be interpreted in correlation with crystal facet-dependent gas adsorption capacity and defect-forming *** results not only imply a tremendous application perspective in monitoring acetone gas at sub-ppm concentration,but also open up an effective throughway to develop reliable gas-sensing devices for early non-invasive diabetes screening.

关键词： Acetone sensor Crystal facet Exhaled breath analysis high reliability α-Fe2O3 nanocrystals

Fault-tolerance wide voltage conversion gain DC/DC converter for more electric aircraft

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Chinese Journal of Aeronautics 2023年第7期36卷 420-429页

作者： Binxin ZHU Jiaxin LIU Yu LIU Kaihong WANG College of Electrical Engineering and New Energy(Hubei Provincial Research Center on Microgrid Engineering Technology) China Three Gorges UniversityYichang 443002China

In this paper,a fault-tolerance wide voltage conversion gain DC/DC converter for More Electric Aircraft(MEA)is *** proposed converter consists of a basic Cuk converter module and n expandable *** adjusting the operation state of the expandable units,the voltage conversion gain of the proposed converter could be regulated,which makes it available for wide voltage conversion ***,since mutual redundancy can be realized between the basic Cuk converter module and the expandable units,the converter can continuously work when an unpredictable fault occurs to the fault-tolerant parts of the proposed converter,which reflects the fault tolerance of the converter and significantly improves the reliability of the ***,the advantages of small input current ripple,automatic current sharing and low voltage stress are also integrated in this *** working principle and features of the proposed converter are mainly introduced,and an experimental prototype with 800 W output power has been manufactured to verify the practicability and availability of the proposed converter.

关键词： Cuk converter Fault tolerance high reliability More Electric Aircraft(MEA) Wide voltage conversion gain

Compensation-rematch for the major components of C-ADS injector-I

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Chinese Physics C 2015年第11期39卷 97-102页

作者：孙彪闫芳裴士伦孟才唐靖宇 Institute of high Energy Physics (IHEP) Chinese Academy of Sciences

The China-ADS project is a strategic plan launched by the Chinese Academy of Sciences to solve the nuclear waste problem and the resource problem for nuclear power in China. Under its long-term plan, it will last until about 2040. In order to achieve the extremely high reliability and availability required for the C-ADS accelerator, a fault tolerant strategy has been implanted. The failure effects of key elements such as the RF cavities and focusing elements in different locations of the injector-I part have been studied and schemes of compensation based on the local compensation-rematch method have been proposed. In addition, error analysis has been carried out to check the reliability of this method compared with the uncompensated situation, and it is found to be very effective. As the injector-I testing facility is coming into operation, it is possible to check and improve the compensation-rematch method with the beam testing experiment before the main linac operation.

关键词： C-ADS high reliability compensation-rematch injector-I

DDUC:an erasure-coded system with decoupled data updating and coding

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Frontiers of Information Technology & Electronic Engineering 2023年第5期24卷 716-730页

作者： Yaofeng TU Rong XIAO Yinjun HAN Zhenghua CHEN Hao JIN Xuecheng QI Xinyuan SUN State Key Laboratory of Mobile Network and Mobile Multimedia Technology Shenzhen 518000China ZTE Corporation Nanjing 210000China

In distributed storage systems,replication and erasure code(EC)are common methods for data *** with replication,EC has better storage efficiency,but suffers higher overhead in ***,consistency and reliability problems caused by concurrent updates bring new challenges to applications of *** works focus on optimizing the EC solution,including algorithm optimization,novel data update method,and so on,but lack the solutions for consistency and reliability *** this paper,we introduce a storage system that decouples data updating and EC encoding,namely,decoupled data updating and coding(DDUC),and propose a data placement policy that combines replication and parity *** the(N,M)EC system,the data are placed as N groups of M+1 replicas,and redundant data blocks of the same stripe are placed in the parity nodes,so that the parity nodes can autonomously perform local EC *** on the above policy,a two-phase data update method is implemented in which data are updated in replica mode in phase 1,and the EC encoding is done independently by parity nodes in phase *** solves the problem of data reliability degradation caused by concurrent updates while ensuring high concurrency *** also uses persistent memory(PMem)hardware features of the byte addressing and eight-byte atomic write to implement a lightweight logging mechanism that improves performance while ensuring data *** results show that the concurrent access performance of the proposed storage system is 1.70–3.73 times that of the state-of-the-art storage system Ceph,and the latency is only 3.4%–5.9%that of Ceph.

关键词： Concurrent update high reliability Erasure code Consistency Distributed storage system

A TRM Control System Designed by Loongson MCU

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A TRM Control System Designed by Loongson MCU

Hardware and Software Design of highly Reliable Integrated Navigation System for Long-endurance UAV

第二十七届中国控制会议

作者： Sun Lei 1,Peng Xuelian 2,Zhu Jihong 3,Deng Hongbin 4 1.Computer Science&Technology Department of Tsinghua University #38 Shangdi,West Road,Haidian District,Beijing 100085,P.R.China 2.Instrument R&D Department of Time Group INC.Haidian District,Beijing 100084,P.R.China 3.Computer Science&Technology Department of Tsinghua University Haidian District,Beijing 100085,P.R.China 4.Computer Science&Technology Department of Beijing Institute of Technology Haidian District,Beijing 100085,P.R.China

A Triple Modular Redundant（TMR） control system achieves high reliability by replicating data and all processing at three independent nodes,so this control system is widely applied in many *** Micro Computer Unite（MCU） is designed by The Institute of Computational Mathematics and Scientific/Engineering Computing of Chinese Academy of Sci-ences which hold property right of Loongson *** this paper,performance of two foreign TMR systems are analyzed firstly,then a TMR control system basing on Loongson 2E chips to handle a single arbitrary node failure is *** of signal vote and process of program synchronization is demonstrated by simple example with three input signals and one output signal.

关键词： Triple Modular Redundant high reliability Signal vote Program synchronization Loongson MCU

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Hardware and Software Design of Highly Reliable Integrated N...