Imposing nodes for linear structures during harmonic excitations using SMURF method |
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Authors: | N Nematipoor M R Ashory E Jamshidi |
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Institution: | 1.Department of Mechanical Engineering,Semnan University,Semnan,Iran;2.Department of Engineering, Semnan branch,Islamic Azad University,Semnan,Iran |
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Abstract: | Vibration absorbers are usually designed using the finite element (FE) model of structures. It is generally believed that
the modal models are more accurate than FE models, because in modal testing the model is built by direct measurement of the
test structure. In this paper, a method is proposed to design a translational vibration absorber using the measured frequency
response functions of a primary structure. The designed vibration absorber imposes a node on the structure when it is excited
by a harmonic force. The method is based on the structural modification using experimental frequency response functions technique
and determines the required receptance of the absorber at the excitation frequency. Moreover, a procedure is developed to
suppress the vibration amplitude of two arbitrary points on a linear structure subjected to harmonic excitations by attaching
two sprung mass absorbers. A cantilever beam is considered for the numerical case study, and the sprung masses are designed
to suppress the vibration amplitude of the beam at the selected arbitrary points. A U-shape plate was considered for the experimental
validation of the method for imposing a node using one absorber. Also, a beam was tested to demonstrate the effectiveness
of method for imposing two nodes on the structures. The experimental results show that the designed absorbers can considerably
suppress the vibration amplitude at the selected points on the structure. |
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