INVESTIGATIONS ON DAMPING CHARACTERISTICS OF LIQUID COLUMN VIBRATION ABSORBER | ||||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||||
| Article 14, Volume 18, 18th International Conference on Applied Mechanics and Mechanical Engineering., April 2018, Page 1-11 PDF (1.04 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/amme.2018.34730 | ||||
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| Author | ||||
| M. F. Younes | ||||
| Assistant professor, Mechanical Design Dept., Faculty of Engineering – Mataria, Helwan University, Cairo, Egypt. | ||||
| Abstract | ||||
| ABSTRACT This work deals with the damping characteristics and optimum performance of a passive liquid column vibration absorber (LCVA) which is effective to decrease the vibration of engineering systems. A numerical technique is applied to solve the nonlinear equations of motion to study the influence of the design parameters such as frequency tuning ratio, length ratio, area ratio, blocking ratio and mass to mitigate excessive vibrations. A constrained multi-objective optimization problem is constructed and solved numerically to minimize the maximum master structure displacement in a broad range of excitation frequency with considering a limit of the maximum liquid displacement in the vertical tube as an extra objective. It is found that the best vibration attenuation can be achieved by using the LCVA with a uniform cross-section area while the non-uniform LCVA offer greater flexibility to modify the non-appropriate total length. The TCVA mass and the structural damping have an influence on all optimum parameters. The optimal values of the blocking ratio are proportional and depend on the intensity of the excitation. The list of necessary optimal parameters and the corresponding performance indices are presented in design tables as a guidance for industrial practices. | ||||
| Keywords | ||||
| Tuned liquid damper; TLCD; LCVA; vibration control; Optimization | ||||
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