AI SearchParameter identification of a pendulum tuned mass damper-structure system by a random decrement technique
Call Number: AIT Thesis no.ST-97-19 Material type:
TextSeries: Asian Institute of Technology. Thesis ; no. ST-97-19Publication details: Bangkok : Asian Institute of Technology, 1997Description: 99 leaves : illSubject(s): Online resources: Dissertation note: Thesis (M. Eng.) - Asian Institute of Technology, 1997 Summary: An effectiveness of a pendulum tuned mass damper (PTMD) in suppressing windinduced response of a structure depends upon the precise knowledge of its properties. The identification of these parameters is consequently an important task. In this study, an identification scheme has been developed to identify the parameters of a system with two closed-spaced frequencies. The scheme is composed of a random decrement technique, several discrete signal processing elements, and varieties of least-squares programs. The last part has been newly developed to jointly utilize with the preceding developed techniques of the first two ones. The number of identified parameters can be adjusted depending upon the requirement. To verify the reliability and accuracy of the scheme, an experimental study was conducted on a chosen system of an axi-symmetric tower with PTMD. The experimental verification can be separated into two steps. At the first step, the dynamic properties of freestanding tower and PTMD were identified from free vibration tests of each individual system. The responses of these systems were mainly dominated by a single mode. The parameters can be therefore accurately identified by a conventional technique. As for the last step, the tower and the PTMD were incorporated into one coupled system. The response of this system to random wind force was measured as well as the free decay response. The response of the coupled system was more complicated than the separated one. The identification results from the complicated coupled response agreed very well with those from the first step, especially the crucial parameters for fine tuning, i. e., mass ratio, frequency ratio, and damping ratio of the PTMD. Accordingly, it is concluded that the scheme can precisely identify the coupled system parameters. Furthermore, it has considerable practical benefit for monitoring the PTMD performance on the real life structures to achieve its capability.
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Thesis (M. Eng.) - Asian Institute of Technology, 1997
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
An effectiveness of a pendulum tuned mass damper (PTMD) in suppressing windinduced response of a structure depends upon the precise knowledge of its properties. The identification of these parameters is consequently an important task. In this study, an identification scheme has been developed to identify the parameters of a system with two closed-spaced frequencies. The scheme is composed of a random decrement technique, several discrete signal processing elements, and varieties of least-squares programs. The last part has been newly developed to jointly utilize with the preceding developed techniques of the first two ones. The number of identified parameters can be adjusted depending upon the requirement. To verify the reliability and accuracy of the scheme, an experimental study was conducted on a chosen system of an axi-symmetric tower with PTMD. The experimental verification can be separated into two steps. At the first step, the dynamic properties of freestanding tower and PTMD were identified from free vibration tests of each individual system. The responses of these systems were mainly dominated by a single mode. The parameters can be therefore accurately identified by a conventional technique. As for the last step, the tower and the PTMD were incorporated into one coupled system. The response of this system to random wind force was measured as well as the free decay response. The response of the coupled system was more complicated than the separated one. The identification results from the complicated coupled response agreed very well with those from the first step, especially the crucial parameters for fine tuning, i. e., mass ratio, frequency ratio, and damping ratio of the PTMD. Accordingly, it is concluded that the scheme can precisely identify the coupled system parameters. Furthermore, it has considerable practical benefit for monitoring the PTMD performance on the real life structures to achieve its capability.
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