http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Viet Hung Cu (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Optimal Parameters of Viscous Damper for Hanged Cables in Arch Bridges
Viet Hung Cu,Bing Han,Tuan Ngoc Nguyen 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Hanged cables of through and half-through arch bridges are vulnerable to dynamic excitation because their intrinsic damping is very low. These components have been exhibiting unanticipated and excessive vibrations, which require more frequent maintenance and affect normal operations of the entire arch bridge. Mitigation of cable vibrations is commonly addressed by using an external damper attached to the cable. In this paper, the vibrations of hanged cables controlled by the viscous damper system was studied in detail using an analytical formulation of the complex eigenvalue problem. Oscillation parameters of the hanged cable-damper systems were analyzed by the exact values of complex eigenvalue. As a result, optimal parameters of the viscous damper could be evaluated and selected in order to reduce vibrations of cable. In addition, a design example was presented to justify the methodology.
-
Tuned Mass-High Damping Rubber Damper on a Taut Cable
Viet Hung Cu,Bing Han,Duy Hoa Pham 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
Due to their low intrinsic damping, stay cables in cable-stayed bridges are vulnerable to dynamic excitation. The cables have often been exhibiting undesirable and excessive vibrations, which result in increasing maintenance frequency and disruption to normal operations of the entire bridges. Mitigation of undesired cable vibration can be achieved by attaching a traditionally mechanical damper near the anchorage. Although utilizing this type of damper demonstrates vibrating diminishment in cables, the approach is not the most effective method due to geometric constraints. Tuned Mass Damper (TMD) has been used to overcome the deficiency of the traditional mechanical damper since it can be mounted anywhere along a cable. This paper proposes a new type of damper called the Tuned Mass - High Damping Rubber (TM-HDR) damper for increasing damping ratio of the cable. Oscillation parameters of cable with an attached TM-HDR damper are investigated in detail using an analytical formulation of the complex eigenvalue problem. As a result, optimal parameters of the damper can be evaluated and selected in order to reduce vibrations of cable. In addition, this paper demonstrates the effects of TM-HDR damper by using an example.
-
Free Vibration and Damping of a Taut Cable with an Attached Viscous Mass Damper
Viet Hung Cu,Bing Han,Duy Hoa Pham,Wu Tong Yan 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
Studies on vibration control of stay cables in cable-stayed bridges have been keenly interested by researchers and engineers indesigning new bridges and assessing in-service bridges. Mitigation of undesired cable vibration can be achieved by attaching adamping device. A Viscous Mass Damper (VMD) is composed by the arrangement a rotational Viscous Damper (VD) and an inertialmass element in parallel, which has been used to control seismic in many buildings in Japan; however, it has not been studied toapply in field of cable vibration control. This paper proposes the application of VMD to robustness in suppressing cable vibration. Oscillation parameters of the cable-VMD system are investigated in detail using an analytical formulation of the complex eigenvalueproblem and compared with Viscous Damper (VD). Asymptotic formulas to calculate the complex eigenvalue solutions and thedamping ratios of the cable with VMD installed in the proximity of the cable end are proposed, discussed and compared with theexact solutions. Further, the influence of elastic support on the VMD effectiveness of a cable-VMD system is analyzed andexamined. Lastly, a case study is provided to justify the proposed methodology. The results of this study show that VMD canimprove the cable damping ratio more efficiently than VD where the maximum damping ratio of VMD is larger than that of VD, andthe increased damping ratio is higher when the relative modes are higher. The paper also provides necessary insights into thedynamics of the cable-VMD system and a useful tool for selecting optimal parameters of VMD for stay cables.
-
Damping of a taut cable with two attached high damping rubber dampers
Viet Hung Cu,Bing Han,Fang Wang 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.6
Due to their low intrinsic damping, stay cables in cable-stayed bridges have often exhibited unanticipated and excessive vibrations which result in increasing maintenance frequency and disruption to normal operations of the entire bridges. Mitigation of undesired cable vibration can be achieved by attaching an external damping device near the anchorage. High Damping Rubber (HDR) dampers have many advantages such as compact size, better aesthetics, easy maintenance, temperature stability, and cost benefits; therefore, they have been widely used to increase cable damping. Although a single damper has been shown to reduce cable vibrations, it is not the most effective method due to geometric constraints. This paper proposes the use of two HDR dampers to improve effectiveness and robustness in suppressing cable vibration. Oscillation parameters of the cable-dampers system were investigated in detail by modeling the stay cable as a taut string and each HDR damper as complex-valued impedance and by using an analytical formulation of the complex eigenvalue problem. The problem of two HDR dampers arbitrarily located along a cable is solved and the solution is discussed. Asymptotic formulas to calculate the damping ratios of the cable with two HDR dampers installed near the anchorage(s) are proposed and compared with the exact solutions. Further, a design example is presented in order to justify the methodology. The results of this study show that when the two HDR dampers are installed close to each other on the same end of the cable, some interaction between the dampers leads to reduced damping ratio. When the dampers are on the opposite ends of the cable, they are effective in increasing damping ratio and can provide better vibration reduction to multiple modes.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
