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 Wysłany: Nie 5:13, 08 Maj 2011 Temat postu: abercrombie outlet Span cable-stayed active contro |
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Span cable-stayed active control of flutter
Calculation results can be seen, significantly higher than its control effect to control only the effect of a single AMD is better. Figure 3 AMD critical wind speed and the distance to the central axis curve of 4 Conclusions d / m Figure 4 and AMD to take the initiative to control the distance between the axis of curve 1. In the aerodynamic force is established under the bridge installed AMD three-dimensional equations of motion and the entire bridge AMD equation of motion derived two installation methods on AMD span cable-stayed bridge to wind-induced flutter theory of active control formula, and the preparation of the corresponding computer program. 2. The results show that: AMD is an effective control of large span cable-stayed bridge flutter device,[link widoczny dla zalogowanych], it can greatly improve the critical flutter velocity of 3. Installed in the axis of symmetry in a group of AMD, because both control the vertical deck bending movement, but also control the deck around the axis of twist, the control effect than simply movement used to control the vertical bending a single AMD better control, which is indicative of bridge flutter with the movement of vertical bending and torsional motion about the participation of multi-modal coupling the vibration. 4. From the theoretical and computational point of view of the AMD on the active control of bridge flutter its application in practical engineering,[link widoczny dla zalogowanych], active body design, installation, optimization,[link widoczny dla zalogowanych], control system and other aspects of energy provision needs to be further study. References 1 Lian Qu. And towering high-rise buildings for wind vibration control design (first edition). Wuhan: Wuhan University of Surveying and Mapping Press, 1991:6 a l62 Ming Gu, Hai-Fan Xiang. Span cable-stayed bridge on the passive wind-induced buffeting control. Civil Engineering Journal. 1993; 26 (6) :64-693 Haifan. Long-span bridge buffeting analysis and control. In: Fourth National Wind Engineering and Industrial Aerodynamics Conference papers. 1994:13-244 Ji Ming Xie. Hai-Fan Xiang. Wind resistant design of the new bridge concepts - multi modal coupling units flutter. Soil surgery Engineering, 1987; 20 (2); 34-45 2 Jian et al: Long Span Bridge Flutter Study on Active Control 2915Namin [A,[link widoczny dla zalogowanych], AlbrechtP, BoschH. Finiteelement-basedflutteranalysisofcahe-suspendedbridgesJournalofStructureEngineeringASCE, 1992; 118 (6) :1509 - 15266 Yan along with Osaki. Sapporo Xie Li. Yifan bad translation. Vibration theory (first edition),[link widoczny dla zalogowanych], Beijing: Earthquake Press ,1990:200 - 202StudyontheActiveControlofFlutterofLong - SpanCable - StayedBridgeHeJi & n (DepartmentofCivilEngineeringSunBingnanZheiiangUniversityHangzhou +310027) QuWeilian (CollegeofCivilEngineering + WuhanUniversityofTechnologyWuhan.430070) XiangHaifan (CollegeofCivilEngineering, TongjiUniversityShanghai, 200092) AbstractThe3-Dmotionequationsoflong -spancable - stayedbridgeequippedwithactivemassdampers (AMD) ateestablishedbasedontheanalysisofthebridgeunderwindloads. Theordersofequationsarereducedbytherealmodes. Accordingtotheoptimalcontroltheory, thecontrolmethodofflutterofcable-stayedbridgeusingAMDistheorectioa] lystudiedinthispaper {thecalculationformulaandthecomputerprogramareset
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