Dissertation > Excellent graduate degree dissertation topics show

The Research on Vibration and Noise Radiation of Box Beam

Author: ChangLiang
Tutor: XieWeiPing
School: Wuhan University of Technology
Course: Structural Engineering
Keywords: rail transit box girder structural noise vibratory response coherence analysis theater vibration isolation
CLC: U441.3
Type: Master's thesis
Year: 2007
Downloads: 163
Quote: 3
Read: Download Dissertation


In recent years, noise has become a serious environmental problem, which hasbothered people to some extent. So people have began to pay more attention to theinfluence of noise on their lives. For many years, people only concern with themedium frequency and high frequency noise, which are related to people’s auditionbut they give less concern to the low frequency noise. Some researches have shownthat if people are in low frequency environment for a long time, they may suffer fromnegative influence on their lives such as nausea dizziness memory decrease andinsomnia. Although low frequency noise induced by box girder accounts for a fewpercentage of overall noise induced by urban rail transit, it should not be neglectedbecause of its negative influence on people’s health. The researches on this questionare very few due to the complexity of dynamic behavior and radiation condition ofbox girder and some indeterminate factors, not to mention domestic researches. As aresult, the research on structural noise of box girder becomes a major subject ofstructural engineering.This paper mainly researches the vibration and noise radiation of box girderunder moving load of rail transit and noise reduction of box girder.Chief works are summarized as follows:1. On the basis of a large number of measurement data, the state of vibration andnoise radiation along box girder section (cross-section, longitudinal section) under themoving load of train are researched and the variation rules of vibration and noiseradiation along box girder section are also summarized.2. Contour charts of vibration acceleration level and sound pressure level aredrawn. From these charts, we could find that which part is in the most intensivevibration state and which part is in the strongest noise radiation state clearly.3. The first four natural vibration frequency of box girder and the correspondentvibration mode are determined4. The sound pressure spectrum and acceleration spectrum are acquired when thetrain runs on the rail adjacent to the measurement points (in which case the rail iscalled ’adjacent rail’) and on the rail far away from the measurement points (in whichcase the rail is called ’distant rail’), respectively. Under these two circumstances, thefrequency range of vibration is different from each other but that of noise radiation isidentical with each other approximately. 5. Radiation sound power is different at different parts of box girder.6. On the basis of coherence analysis of vibration and noise, frequency range ofvibration, which make great contributions to noise radiation, are determined. So noiseradiation level could be decreased by weakening correspondent vibration level.7. The measurements of vibration isolation applied to Zhongnan theater areanalysed in order to decrease the structural noise induced by elevated rail transit.In the end, the content of this paper has been summarized and some problems,which need further study, have been proposed.

Related Dissertations

  1. Research of the City Expansion and Thermal Environment in Guangzhou,X16
  2. On campus drama activities and functions of ideological education for sustainable development,G641
  3. Chongqing rail transit to carry out the study of urban distribution,F572.88
  4. The Large Concrete Hydration Heat Temperature Effects Research of the Cable Stayed Bridge,U441.5
  5. Vibration Isolation Design of Powertrain Mounting System of a Commercial Vehicle,U463.33
  6. Research on Utilization Technique of Regenerating Braking Energy in Urban Rail Traction System,TM922.3
  7. Watching in Life of Disintegration,I512.073
  8. Based on the virtual building urban rail transit construction management model,F572
  9. On \,F713.8
  10. Urban rail transit passenger transfer station early warning and response method,U239.5
  11. Value of urban rail transport services,U239.5
  12. Disaggregate model based on the conventional bus - the proposed transfer of urban rail transit passenger,U12
  13. Wide dwarf tower cable-stayed structure parameters analysis and wide box girder shear lag effect,U448.27
  14. Varying analysis considering shear lag effects of variable cross-section PC cantilever box girder,U448.213
  15. Ningbo-Taizhou- Wenzhou Railway Yandangshan King the superimposed arch bridge construction key technology research,U445.4
  16. PC box girder creep effect analysis based on ANSYS secondary development,U448.35;U441
  17. Study on Mechanical Performance of Curved Box-girder with Corrugated Steel Webs,U448.213
  18. Research on Design Method of Thin-Walled Steel Box Girder,U448.213
  19. Finite Element Analysis on Mechanical Behavior of the External PSC Composite Box-Girders with Corrugated Steel Webs,U448.213
  20. Research on the Whole Structrue and Detail Structrue of Cable-Stayed Bridge,U448.27
  21. Structural Stress Analysis of Small and Medium Span Expanded Bridge,U441

CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Bridge vibration and damping device
© 2012 www.DissertationTopic.Net  Mobile