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Development of Strain Measurement in Superconducting Magnet Through Fiber Bragg Grating
Hongjie Zhang,Fanping Deng,Qiuliang Wang,Luguang Yan,Yingming Dai,Keeman Kim IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>Temperature and strain responses of fiber Bragg grating sensors were measured in cryogenic environment. With temperature from room temperature down to 77 K or 4.2 K, the temperature response was found to be relatively linear above 100 K, and the temperature sensitivity decreases with the decrease of temperature, and to approximately zero for temperature less than 50 K. Technologies were developed to eliminate the multi-peaks in strain experiment, so the strain response was measured at 77 K, and was found to be linear at constant temperatures.</P>
Research on Braking Process of High-speed Train with Aerodynamic Brake
Yonghua Zhu,Weilie Shang,Xia Zhang,Hongjie Yan,Pin Wu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
The speed is higher, the kinetic energy is greater. In order to ensure the safety of a new generation train running in a high speed, it is necessary to research on its braking performance. In this paper, the braking force, running resistance, braking time, braking distance and the deceleration generated by the train with two kinds of braking wings were analyzed while the high-speed train was doing deceleration movement. And the results were compared and analyzed between the train with and without braking wing, and between the two kinds of braking wings. The results showed that the high speed train with braking wings made much contribution to the acceleration in the braking process, especially the train is in high speed.
Hongjie Wu,Suiyuan Chen,Chenyi Zhang,Jing Liang,Changsheng Liu,Mei Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Fretting damage under high temperature corrosion and wear condition is one of the main factors that cause the failure of thekey parts of mechanical and electrical equipment, and laser cladding wear-resistant and corrosion-resistant coating is the maintechnology to repair these failure key parts. In this paper, the layered 50Cr6Ni2/Stellite X-40 multi-material was prepared bydirect laser deposition (DLD) using wear-resistant Fe-based alloy and corrosion-resistant Co-based alloy, to meet the needsof repair and remanufacturing of key parts with fretting damage. The results show that the layered 50Cr6Ni2/Stellite X-40composite material retains their respective microstructures and excellent properties. The microstructure of the 50Cr6Ni2layer mainly contains martensite and granular bainite, the microstructure of the Stellite X-40 layer consists of dendrite andeutectic structure. The layered 50Cr6Ni2/Stellite X-40 composite material has both good wear resistance (wear mass loss is1.0 mg) and good corrosion resistance (− 0.37549 of Ecorrand 0.00032 of icorr). The DLD layered 50Cr6Ni2/Stellite X-40composite material could meet the demand of short stress path rolling mill remanufacturing.
Hongjie Ni,Zhenhua Xu,Jun Cheng,Dan Zhang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.7
This paper addresses the robust stochastic sampled-data-based output feedback (SSDBOF) consensuscontroller design for a network of continuous-time heterogeneous multi-agent systems (MASs) in the presence ofdenial-of-service (DoS) attack. Under the mild assumption that the sampling instant is stochastically triggered andsatisfies the Markov property, a homogeneous Markovian jump system (MJS) method is introduced that is capable ofmodeling the stochastic sampled-data-based control system. Furthermore, the randomly occurring Deny-of-Service(DoS) attack problem is also taken into account due to the existence of potential adversary that tries to block thecommunication channels. A novel discrete-time stochastic Markovian system model is first introduced that enablesus to deal with the stochastic sampling and random DoS attack phenomena in a unified framework. Then byadopting the decoupling scheme, some sufficient conditions are proposed such that all the outputs of the followingagents can track the output of the leading agent, and the prescribed H∞ performance level is also guaranteed. Inour work, the SSDBOF consensus controller design method is transformed to a feasibility problem subject to thelinear matrix inequality (LMI) constraints. The theoretical results are finally applied to solve the position trackingproblem of a network of vehicle systems
Hui Zhang,Junxi Zheng,Li Yi,Yue Li,Zhe Ma,Hongjie Fan,Chengping Lu 한국미생물학회 2014 The journal of microbiology Vol.52 No.11
Streptococcus suis, a major swine pathogen, is an emergingzoonotic agent that causes meningitis and septic shock. Bacterialcell wall and secreted proteins are often involved ininteractions with extracellular matrix proteins (ECMs), whichplay important roles in the initial steps of pathogenesis. Inthis study, 2D SDS-PAGE, western blotting-based bindingaffinity measurements, and microtiter plate binding assayswere used to identify cell wall and secreted proteins from S. suis that interact with fibronectin and collagen type І. Weidentified six proteins from S. suis, including three proteins(translation elongation factor G, oligopeptide-binding proteinOppA precursor, and phosphoglycerate mutase) thatshow both fibronectin and collagen type І binding activity. To the best of our knowledge, these three newly identifiedproteins had no previously reported fibronectin or collagentype І binding activity. Overall, the aim in this study was toidentify proteins with ECM binding activity from S. suis andit represents the first report of six new proteins from S. suisthat interact with fibronectin or collagen type І.
Two case studies on structural analysis of transmission towers under downburst
Yang, FengLi,Zhang, HongJie Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.22 No.6
Downbursts are of great harm to transmission lines and many towers can even be destroyed. The downburst wind field model by Chen and Letchford was applied, and the wind loads of two typical transmission towers in inland areas and littoral areas were calculated separately. Spatial finite element models of the transmission towers were established by elastic beam and link elements. The wind loads as well as the dead loads of conductors and insulators were simplified and applied on the suspension points by concentrated form. Structural analysis on two typical transmission towers under normal wind and downburst was completed. The bearing characteristics and the failure modes of the transmission towers under downburst were determined. The failure state of tower members can be judged by the calculated stress ratios. It shows that stress states of the tower members were mainly controlled by 45 degree wind load. For the inland areas with low deign wind velocity, though the structural height is not in the highest wind velocity zone of downburst, the wind load under downburst is much higher than that under normal wind. The main members above the transverse separator of the legs will be firstly destroyed. For the littoral areas with high deign wind velocity, the wind load under downburst is lower than under normal wind. Transmission towers are not controlled by the wind loads from downbursts in design process.
Two case studies on structural analysis of transmission towers under downburst
FengLi Yang,HongJie Zhang 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.22 No.6
Downbursts are of great harm to transmission lines and many towers can even be destroyed. The downburst wind field model by Chen and Letchford was applied, and the wind loads of two typical transmission towers in inland areas and littoral areas were calculated separately. Spatial finite element models of the transmission towers were established by elastic beam and link elements. The wind loads as well as the dead loads of conductors and insulators were simplified and applied on the suspension points by concentrated form. Structural analysis on two typical transmission towers under normal wind and downburst was completed. The bearing characteristics and the failure modes of the transmission towers under downburst were determined. The failure state of tower members can be judged by the calculated stress ratios. It shows that stress states of the tower members were mainly controlled by 45 degree wind load. For the inland areas with low deign wind velocity, though the structural height is not in the highest wind velocity zone of downburst, the wind load under downburst is much higher than that under normal wind. The main members above the transverse separator of the legs will be firstly destroyed. For the littoral areas with high deign wind velocity, the wind load under downburst is lower than under normal wind. Transmission towers are not controlled by the wind loads from downbursts in design process.