Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles
Rolling stock manufacturers face the challenge of manufacturing lightweight high-speed trains without deteriorating comfort. One of the difficulties is to mantain or increase structural stiffness and damping as the car bodies become lighter. Leaving aside active solutions, which are expensive and ge...
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MDPI AG
2022-08-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/16/8220 |
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| author | Miguel Melero Antonio J. Nieto Angel L. Morales Eduardo Palomares Jose M. Chicharro Carmen Ramiro Publio Pintado |
| author_facet | Miguel Melero Antonio J. Nieto Angel L. Morales Eduardo Palomares Jose M. Chicharro Carmen Ramiro Publio Pintado |
| author_sort | Miguel Melero |
| collection | DOAJ |
| description | Rolling stock manufacturers face the challenge of manufacturing lightweight high-speed trains without deteriorating comfort. One of the difficulties is to mantain or increase structural stiffness and damping as the car bodies become lighter. Leaving aside active solutions, which are expensive and generally complex to implement, increasing structural damping by means of viscoelastic patches (via Constrained Layer Damping) seems to be a viable solution which is in fact already used for acoustic insulation in automotive, aerospace and even railway applications. Although there are works in the literature that try to optimise viscoelastic panels, this work presents an experimental study with two essential contributions: (i) to analyse the influence of a broad set of design parameters such as type of the constraining layer (uniform or honeycomb), thickness of the viscoelastic layer, location, covered area and continuity between patches; and (ii) to consider absolute and specific (per unit mass) damping depending on the design scenario. To locally increase the structural damping of an existing lightweight structure without compromising its weight, partial application of thin viscoelastic and constraining layers turned out to be the best solution. To enhance structural damping from the design stages, disregarding constraining layer mass by incorporating its stiffness into the overall stiffness of the structure, full coverage with thick viscoelastic layer and a honeycomb constraining layer with a high cross-section moment of inertia turned out to be the best option, reaching modal damping ratios up to 22 times higher than structures without viscoelastic materials. |
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| format | Article |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T11:56:16Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-1ac21cb2038d4617ab4c4442f04b8dcf2023-11-30T23:08:39ZengMDPI AGApplied Sciences2076-34172022-08-011216822010.3390/app12168220Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway VehiclesMiguel Melero0Antonio J. Nieto1Angel L. Morales2Eduardo Palomares3Jose M. Chicharro4Carmen Ramiro5Publio Pintado6E.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainE.T.S. Ingeniería Industrial de Ciudad Real, University of Castilla-La Mancha, 13071 Ciudad Real, SpainRolling stock manufacturers face the challenge of manufacturing lightweight high-speed trains without deteriorating comfort. One of the difficulties is to mantain or increase structural stiffness and damping as the car bodies become lighter. Leaving aside active solutions, which are expensive and generally complex to implement, increasing structural damping by means of viscoelastic patches (via Constrained Layer Damping) seems to be a viable solution which is in fact already used for acoustic insulation in automotive, aerospace and even railway applications. Although there are works in the literature that try to optimise viscoelastic panels, this work presents an experimental study with two essential contributions: (i) to analyse the influence of a broad set of design parameters such as type of the constraining layer (uniform or honeycomb), thickness of the viscoelastic layer, location, covered area and continuity between patches; and (ii) to consider absolute and specific (per unit mass) damping depending on the design scenario. To locally increase the structural damping of an existing lightweight structure without compromising its weight, partial application of thin viscoelastic and constraining layers turned out to be the best solution. To enhance structural damping from the design stages, disregarding constraining layer mass by incorporating its stiffness into the overall stiffness of the structure, full coverage with thick viscoelastic layer and a honeycomb constraining layer with a high cross-section moment of inertia turned out to be the best option, reaching modal damping ratios up to 22 times higher than structures without viscoelastic materials.https://www.mdpi.com/2076-3417/12/16/8220constrained layer dampingviscoelastic materialflexural vibrationexperimental modal analysis |
| spellingShingle | Miguel Melero Antonio J. Nieto Angel L. Morales Eduardo Palomares Jose M. Chicharro Carmen Ramiro Publio Pintado Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles Applied Sciences constrained layer damping viscoelastic material flexural vibration experimental modal analysis |
| title | Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles |
| title_full | Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles |
| title_fullStr | Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles |
| title_full_unstemmed | Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles |
| title_short | Experimental Analysis of Constrained Layer Damping Structures for Vibration Isolation in Lightweight Railway Vehicles |
| title_sort | experimental analysis of constrained layer damping structures for vibration isolation in lightweight railway vehicles |
| topic | constrained layer damping viscoelastic material flexural vibration experimental modal analysis |
| url | https://www.mdpi.com/2076-3417/12/16/8220 |
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