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RISS 인기검색어
- 검색키워드
- 저자 : Yanbin Shen (검색결과 5 건)
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Implementation of SHM system for Hangzhou East Railway Station using a wireless sensor network
Yanbin Shen,Wenwei Fu,Yaozhi Luo,Chung Bang Yun,Dun Liu,Pengcheng Yang,Guang Yang,Guangen Zhou 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.1
Structural health monitoring (SHM) is facilitated by new technologies that involve wireless sensor networks (WSNs). The main benefits of WSNs are that they are distributed, are inexpensive to install, and manage data effectively via remote control. In this paper, a wireless SHM system for the steel structure of Hangzhou East Railway Station in China is developed, since the state of the structural life cycle is highly complicated and the accompanying internal force redistribution is not known. The monitoring system uses multitype sensors, which include stress, acceleration, wind load, and temperature sensors, as the measurement components for the structural features, construction procedure, and on-site environment. The sensor nodes communicate with each other via a flexible tree-type network. The system that consists of 323 sensors is designed for the structure, and the data acquisition process will continue throughout its whole life cycle. First, a full-scale application of SHM using a WSN is described in details. Then, it focuses on engineering practice and data analysis. The current customized WSN has been demonstrated to have satisfactory durability and strong robustness; hence, it well satisfies the requirements for multi-type sensors to operate in a large area. The data analysis results demonstrate that the effects of the construction process and the environment on the super-large-scale structure have been captured accurately. Those effects include the stress variation throughout the construction process, the dynamic responses that are caused by passing trains, the strain variation caused by temperature change over the long term, and the delay in the wind-pressure history.
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Solution-based synthesis of PEDOT:PSS films with electrical conductivity over 6300 S/cm
Yanbin Shi,Yuqin Zhou,Rongzong Shen,Fengzhen Liu,Yurong Zhou 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
Poly(3,4-ethylenedioxythiophene) mixed with poly (styrenesulfonate) (PEDOT:PSS) is considered as oneof the most valuable conductive polymers due to its high conductivity, transparency and mechanicalflexibility. Many experiments have proved that H2SO4 post-treatment is an effective way to enhance theelectrical conductivity of PEDOT:PSSfilms. Here we reported a method for the fabrication of PEDOT:PSSfilms with conductivity as high as 6323.9 364.5 S/cm, based on a two-step H2SO4 post-treatment. Thisvery high conductivity is, as far as we know, the highest reported value for PEDOT:PSSfilms by solutionpreparation. The removal of PSS and redox reaction are the keys to enhance the conductivity of PEDOT:PSSfilms.
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Yaozhi Luo,Yanbin Shen,Pengcheng Yang,Feng Yu,Zhouneng Zhong,Jiangbo Hong 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
In civil engineering, revolving structures (RS) are a unique structural form applied in innovative architecture design. Such structures are able to revolve around themselves or along a certain track. However, few studies are dedicated to safety design or health monitoring of RS. In this paper, a wireless dynamic sensing system is developed for RS, and field tests toward a large revolving auditorium are conducted accordingly. At first, a wheel-rail problem is proposed: The internal force redistributes in RS, which is due to wheel-rail irregularity. Then the development of the sensing system for RS is presented. It includes system architecture, network organization, vibrating wire sensor (VWS) nodes and online remote control. To keep the sensor network identifiable during revolving, the addresses of sensor nodes are reassigned dynamically when RS position changes. At last, the system is mounted on a huge outdoor revolving auditorium. Considering the influence of the proposed problem, the RS of the auditorium has been designed conservatively. Two field tests are conducted via the sensing system. In the first test, 2000 people are invited to act as the live load. During the revolving process, data is collected from RS in three different load cases. The other test is the online monitoring for the auditorium during the official performances. In the end, the field-testing result verifies the existence of the wheel-rail problem. The result also indicates the dynamic sensing system is applicable and durable even while RS is rotating.
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Luo, Yaozhi,Yang, Pengcheng,Shen, Yanbin,Yu, Feng,Zhong, Zhouneng,Hong, Jiangbo Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
In civil engineering, revolving structures (RS) are a unique structural form applied in innovative architecture design. Such structures are able to revolve around themselves or along a certain track. However, few studies are dedicated to safety design or health monitoring of RS. In this paper, a wireless dynamic sensing system is developed for RS, and field tests toward a large revolving auditorium are conducted accordingly. At first, a wheel-rail problem is proposed: The internal force redistributes in RS, which is due to wheel-rail irregularity. Then the development of the sensing system for RS is presented. It includes system architecture, network organization, vibrating wire sensor (VWS) nodes and online remote control. To keep the sensor network identifiable during revolving, the addresses of sensor nodes are reassigned dynamically when RS position changes. At last, the system is mounted on a huge outdoor revolving auditorium. Considering the influence of the proposed problem, the RS of the auditorium has been designed conservatively. Two field tests are conducted via the sensing system. In the first test, 2000 people are invited to act as the live load. During the revolving process, data is collected from RS in three different load cases. The other test is the online monitoring for the auditorium during the official performances. In the end, the field-testing result verifies the existence of the wheel-rail problem. The result also indicates the dynamic sensing system is applicable and durable even while RS is rotating.
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Kinematic Path Analysis of Kinematically Indeterminate Systems
Xingfei Yuan,Along Li,Yanbin Shen,Ruojun Qian 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Kinematically indeterminate systems are geometrically unstable. Considering that there is only tiny elastic deformation in the process of the mechanism motion, the method to simulate kinematic paths of kinematically indeterminate systems without considering elastic deformation is studied in this paper. Based on the equilibrium matrix theory, mechanism displacement is decomposed into combinatorial displacement of independent inextensional mechanisms and displacement resulted from the length modifications of members. The reasonable combination coefficient of inextensional mechanisms is determined by the gradient of the potential energy. An analysis algorithm is developed to simulate the kinematic paths of rigid pin-bar assemblies. The validity and accuracy of the algorithm proposed in this paper is illustrated by three typical examples.
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