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Vibration mitigation of stay cable using optimally tuned MR damper
Huang, Hongwei,Sun, Limin,Jiang, Xiaolu Techno-Press 2012 Smart Structures and Systems, An International Jou Vol.9 No.1
Mechanical dampers have been proved to be one of the most effective countermeasures for vibration mitigation of stay cables in various cable-stayed bridges over the world. However, for long stay cables, as the installation height of the damper is restricted due to the aesthetic concern, using passive dampers alone may not satisfy the control requirement of the stay cables. In this connection, semi-active MR dampers have been proposed for the vibration mitigation of long stay cables. Although various studies have been carried out on the implementation of MR dampers on stay cables, the optimal damping performance of the cable-MR damper system has yet to be evaluated. Therefore, this paper aims to investigate the effectiveness of MR damper as a semi-active control device for the vibration mitigation of stay cable. The mathematical model of the MR damper will first be established through a performance test. Then, an efficient semi-active control strategy will be derived, where the damping of MR damper will be tuned according to the dynamic characteristics of stay cable, in order to achieve optimal damping of cable-damper system. Simulation study will be carried out to verify the proposed semi-active control algorithm for suppressing the cable vibrations induced by different loading patterns using optimally tuned MR damper. Finally, the effectiveness of MR damper in mitigating multi modes of cable vibration will be examined theoretically.
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Vibration mitigation of stay cable using optimally tuned MR damper
Hongwei Huang,Limin Sun,Xiaolu Jiang 국제구조공학회 2012 Smart Structures and Systems, An International Jou Vol.9 No.1
Mechanical dampers have been proved to be one of the most effective countermeasures for vibration mitigation of stay cables in various cable-stayed bridges over the world. However, for long stay cables, as the installation height of the damper is restricted due to the aesthetic concern, using passive dampers alone may not satisfy the control requirement of the stay cables. In this connection, semi-active MR dampers have been proposed for the vibration mitigation of long stay cables. Although various studies have been carried out on the implementation of MR dampers on stay cables, the optimal damping performance of the cable-MR damper system has yet to be evaluated. Therefore, this paper aims to investigate the effectiveness of MR damper as a semi-active control device for the vibration mitigation of stay cable. The mathematical model of the MR damper will first be established through a performance test. Then, an efficient semi-active control strategy will be derived, where the damping of MR damper will be tuned according to the dynamic characteristics of stay cable, in order to achieve optimal damping of cable-damper system. Simulation study will be carried out to verify the proposed semi-active control algorithm for suppressing the cable vibrations induced by different loading patterns using optimally tuned MR damper. Finally, the effectiveness of MR damper in mitigating multi modes of cable vibration will be examined theoretically
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CRA Reputation and Bond Yield: Evidence from the Chinese Bond Market
Hua Wang,Xiaolu Hu,Haozhi Huang,Jing Shi 한국증권학회 2019 Asia-Pacific Journal of Financial Studies Vol.48 No.2
The paper examines the reputation effect of credit rating agencies (CRAs) in China. We find a negative association between CRAs’ reputation and public bonds’ offering yield spreads after controlling for endogeneity. Analyses of the correlation between CRA reputation and bond return volatility in the aftermarket and cross-sectional variations of reputation effects alongside a host of information environment proxies for issuers, we identify the information channel through which CRA reputation plays its role. This is further supported when we utilize an exogenous event, the introduction of an independent CRA (the China Bond Rating Co. Ltd), to explore the potential changes of the reputation effect.
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Chi Zhang,Xiaolu Huang,Miao Yang,Si-Lu Chen,Jinhua Chen,Guilin Yang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.3
A long-stroke nano-positioning stage driven by voice coil actuator (VCA) and supported by flexure guide is designed in this paper. The Halbach permanent magnet array is implemented in the VCA to improve the air-gap flux density with the magnetic concentration effect. The air-gap magnetic fi eld is modeled with an equivalent magnetic structure and verified by finite element analysis. The proposed equivalent magnetic structure reduces the number of boundary condition equations and hence simplifies the analysis procedure. Besides, a novel spring-damping tuning method is proposed based on the equivalent dynamic model of the closed-loop system. This tuning method regards P control and D control as a virtual spring and a virtual damper. The controller parameters are tuned in an intuitive way. Experimental results show that the positioning stage is capable of achieving a resolution of 40 nm within a stroke of 0.8 mm with high repeatability. The spring-damping tuning method ensures better control performance compared to Ziegler Nichols (Z–N) tuning method where overshoot and settling time are decreased.
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Ju, Jonghyun,Huang, Xiaolu,Kim, Seok-Min,Yeom, Junghoon American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Highly ordered silicon nanowires with a high aspect ratio were fabricated by a metal assisted chemical etching (MACE) process combined with a nanoimprinting-assisted metal patterning method. A polymethylmethacrylate (PMMA) layer was coated on a silicon wafer as a sacrificial lift-off layer, and the highly ordered nanodot structures were ultraviolet (UV) nanoimprinted on the PMMA layer. The Au nanomesh arrayed catalyst layer for the MACE process was fabricated on a silicon wafer using a lift-off method with a UV imprinted nanodot barrier. The etching rate of the MACE process was analyzed for accurate control of the length of the silicon nanowires.</P>
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