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Constrained layer damping (CLD) is a widely recognized technique for utilizing viscoelastic damping materials in the passive control of structural vibrations. In this study, CLD is implemented by sandwiching a polyurethane rubber layer between two stiff elastic layers, forming an asymmetric sandwich beam. The experimental process begins with fabricating the polyurethane rubber layer and then determining its frequency-dependent viscoelastic properties using a Dynamic Mechanical Analysis (DMA) machine. The damping capabilities of the pure polyurethane layer are evaluated through vibration tests on a CLD-treated beam, which includes a cantilever beam experiment and a base excitation test. Prior to these tests, a 3D finite element (FE) model is developed to assess modal parameters such as natural frequency, and modal loss factor, ensuring the accuracy of the vibration tests. The results from the vibration tests show a significant improvement in the damping performance of the polyurethane rubber when used as a constrained damping layer on the aluminum undamped bare beam substrate.

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Vibration Damping Analysis of Polyurethane Rubber in Constrained Layer Damping Treatment for Beam Structures: Experimental Investigation and Finite Element Modeling

  • 会议论文

  • 发表日期：

    2026年

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  • Nitin Kumar,
  • Satyajit Panda

摘要

Constrained layer damping (CLD) is a widely recognized technique for utilizing viscoelastic damping materials in the passive control of structural vibrations. In this study, CLD is implemented by sandwiching a polyurethane rubber layer between two stiff elastic layers, forming an asymmetric sandwich beam. The experimental process begins with fabricating the polyurethane rubber layer and then determining its frequency-dependent viscoelastic properties using a Dynamic Mechanical Analysis (DMA) machine. The damping capabilities of the pure polyurethane layer are evaluated through vibration tests on a CLD-treated beam, which includes a cantilever beam experiment and a base excitation test. Prior to these tests, a 3D finite element (FE) model is developed to assess modal parameters such as natural frequency, and modal loss factor, ensuring the accuracy of the vibration tests. The results from the vibration tests show a significant improvement in the damping performance of the polyurethane rubber when used as a constrained damping layer on the aluminum undamped bare beam substrate.