Location

Arlington, Virginia

Date

14 Aug 2008, 4:30pm - 6:00pm

Abstract

This study is concerned in developing a rapid solution of unwanted vibrations arising from a forging facility in Düzce Industrial Park (DIP), Turkey. A site visit revealed that the foundation of the impact hammer was constructed based on judgment. After collecting the relevant data to the extend possible, the system was modeled with two single degrees of freedom having two masses and two springs without any appreciable damping. The results of the analysis indicated that the best solution would be to improve the foundation soil or support the machine on piles, which was unacceptable to the owner because of the backup of the orders. The short-term solution was to use the vibration absorber approach in the reverse order by assuming the foundation slab to be protected from vibrations and by assuming the machine to act as a vibration isolator block. In other words, the foundation amplitude was reduced by allowing the machine to have higher amplitude. This was done by reducing the springs between the foundation and the machine, which was completed in six hours. Amplitude of the foundation displacement is reduced by 50% while the amplitude of the machine is allowed to increase about 85%, which was acceptable for both the owner and the DIP authority.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

6th Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

Missouri University of Science and Technology

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mitigation of Adverse Vibrations in Nearby Structures Arising from a Large Forge Hammer

Arlington, Virginia

This study is concerned in developing a rapid solution of unwanted vibrations arising from a forging facility in Düzce Industrial Park (DIP), Turkey. A site visit revealed that the foundation of the impact hammer was constructed based on judgment. After collecting the relevant data to the extend possible, the system was modeled with two single degrees of freedom having two masses and two springs without any appreciable damping. The results of the analysis indicated that the best solution would be to improve the foundation soil or support the machine on piles, which was unacceptable to the owner because of the backup of the orders. The short-term solution was to use the vibration absorber approach in the reverse order by assuming the foundation slab to be protected from vibrations and by assuming the machine to act as a vibration isolator block. In other words, the foundation amplitude was reduced by allowing the machine to have higher amplitude. This was done by reducing the springs between the foundation and the machine, which was completed in six hours. Amplitude of the foundation displacement is reduced by 50% while the amplitude of the machine is allowed to increase about 85%, which was acceptable for both the owner and the DIP authority.