4 research outputs found
Use of viscoelastic polymer sheet as an acoustic control treatment in ceramic tiles to improve sound insertion loss
Ceramic tiles are commonly used in non-structural components of a building such as walls, partitions, floors, and roofs. However, due to their high surface hardness and density, ceramic tiles are not an ideal soundproof material. To improve the sound properties, this study introduced the use of a viscoelastic polymer sheet (VPS) as an acoustic control treatment. The VPS was attached to ceramic tiles in 4 different patterns: X, Cross, Corner, and Strip. The ceramic tiles with VPS were tested for the damping property and sound insertion loss (IL) and then compared to the ones without VPS. Results indicated that the attachment of VPS improved the damping property of the ceramic tiles. All tiles with VPS exhibited higher damping loss indexes than the ones with no VPS. The highest damping loss index of 0.017â0.018 was observed in the specimens with VPS in X and Cross patterns. In the case of IL, the performance of all ceramic tiles was indifferent when tested at sound frequencies smaller than 1000Hz. At the sound frequencies above 1000Hz, the best performance was observed in the specimen with VPS in the Cross pattern, followed by X, Strip, and Corner patterns, respectively. This concluded that the use of VPS can improve the damping property of a ceramic tile which also leads to the improvement in sound insertion loss
Analysis of Train-bridge Dynamic Interaction By Using Finite Element Method and Multibody Co-simulation Model: Case Study of Thailand Airport Rail Link Project
āļāļēāļāļ§āļīāļāļąāļĒāļāļĩāđāļĄāļĩāļ§āļąāļāļāļļāļāļĢāļ°āļŠāļāļāđāđāļāļ·āđāļāļ§āļīāđāļāļĢāļēāļ°āļŦāđāļāļĨāļāļāļāļŠāļāļāļāđāļāļāļāļāļīāļŠāļąāļĄāļāļąāļāļāđāļĢāļ°āļŦāļ§āđāļēāļāļĢāļāđāļāđāļĨāļ°āļŠāļ°āļāļēāļāļāđāļ§āļĒāļĢāļ°āđāļāļĩāļĒāļāļ§āļīāļāļĩāđāļāđāļāļāđāļāļīāļĨāļīāđāļĄāļāļāđ (Finite Element Method) āļĢāđāļ§āļĄāļāļąāļāđāļāļāļāļģāļĨāļāļāļĄāļąāļĨāļāļīāļāļāļāļĩāđ (Multibody Co-Simulation Method) āđāļāļĒāđāļāđāļāļąāļ§āļāļĒāđāļēāļāļŠāļ°āļāļēāļāđāļĨāļ°āļĢāļāđāļāļāļēāļāđāļāļĢāļāļāļēāļĢāļĢāļāđāļāļāđāļēāđāļāļĢāđāļāļāļĢāđāļ āđāļĢāļĨ āļĨāļīāļāļāđ āđāļāļāļēāļĢāļŠāļĢāđāļēāļāđāļāļāļāļģāļĨāļāļ āļāļāļāļāļēāļāļāļĩāđāđāļāļāļēāļĢāļ§āļīāļāļąāļĒāļĒāļąāļāđāļāđāļāļģāļāļēāļĢāļāļāļŠāļāļāļāļĢāļīāļāđāļāļĒāļāļīāļāļāļąāđāļāļāļļāļāļāļĢāļāđāļāļāļŠāļ°āļāļēāļāđāļāļ·āđāļāļāļĢāļ§āļāļ§āļąāļāļāļēāļĢāļŠāļąāđāļāļŠāļ°āđāļāļ·āļāļāđāļĄāļ·āđāļāļĢāļāđāļāđāļĨāđāļāļāđāļēāļ āļāļĨāļāļĩāđāđāļāđāļāļēāļāļāļēāļĢāļāļāļŠāļāļāļāļ°āļāļđāļāļāļģāļĄāļēāđāļāđāđāļāļāļēāļĢāđāļāļĢāļĩāļĒāļāđāļāļĩāļĒāļāļāļąāļāļāļĨāļāļēāļāļāļēāļĢāļ§āļīāđāļāļĢāļēāļ°āļŦāđāļāđāļ§āļĒāđāļāļāļāļģāļĨāļāļāļāļēāļāļāļāļīāļāļĻāļēāļŠāļāļĢāđ āļāļēāļāļāļĨāļāļēāļĢāļāļģāđāļāļīāļāļāļēāļĢāļāļāļ§āđāļēāļĢāļđāļāđāļāļāļāļāļāļāļēāļĢāļŠāļąāđāļāļŠāļ°āđāļāļ·āļāļāđāļĨāļ°āļāđāļēāļāļēāļĢāđāļāđāļāļāļąāļ§āļāļāļāļŠāļ°āļāļēāļāļāļĩāđāđāļāđāļāļēāļāļāļēāļĢāļāļĢāļ§āļāļ§āļąāļāļĄāļĩāļāļ§āļēāļĄāļŠāļāļāļāļĨāđāļāļāļāļąāļāļāļĨāļĨāļąāļāļāđāļāļĩāđāđāļāđāļāļēāļāđāļāļāļāļģāļĨāļāļāļŊ āļāļĒāđāļēāļāđāļĢāļāđāļāļēāļĄ āļāļāļ§āđāļēāļāđāļēāļāļ§āļēāļĄāđāļĢāđāļāļāļĩāđāđāļāļīāļāļāļķāđāļāļāļāļŠāļ°āļāļēāļāļāļąāđāļāļĄāļĩāļāļ§āļēāļĄāđāļāļāļāđāļēāļāļāļąāļāļāļĒāđāļēāļāļĄāļĩāļāļąāļĒāļŠāļģāļāļąāļ āđāļāļĒāļāļēāļāđāļāđāļāļāļĨāļĄāļēāļāļēāļāļāļąāļāļāļąāļĒāļāļ·āđāļāđāđāļāđāļ āļāļ§āļēāļĄāđāļĄāđāļŠāļĄāđāļģāđāļŠāļĄāļāļāļāļāļāļīāļ§āļāļēāļ (Track Irregularity) āļĢāļ§āļĄāđāļāļāļķāļāļāļ§āļēāļĄāļŠāļĄāļāļđāļĢāļāđāļāļāļāļŠāđāļ§āļāļāļĢāļ°āļāļāļāļāđāļēāļāđ āļāļāļāļāļēāļāļ§āļīāđāļ āļāļĨāļāļēāļāļāļēāļĢāļ§āļīāļāļąāļĒāđāļŠāļāļāđāļŦāđāđāļŦāđāļāļāļķāļāđāļāļ§āļāļēāļāļāļēāļĢāļāļĢāļ°āļĒāļļāļāļāđāđāļāđāđāļāļāļāļģāļĨāļāļāļĢāļ°āđāļāļĩāļĒāļāļ§āļīāļāļĩāđāļāđāļāļāđāļāļīāļĨāļīāđāļĄāļāļāđāļĢāđāļ§āļĄāļāļąāļāđāļāļāļāļģāļĨāļāļāļĄāļąāļĨāļāļīāļāļāļāļĩāđ āļāļĩāđāļŠāļēāļĄāļēāļĢāļāļāļģāđāļāđāļāđāđāļāļāļēāļĢāļāļēāļāļāļ°āđāļāļāļĨāļāļāļāļŠāļāļāļāļāļēāļāļāļĪāļāļīāļāļĢāļĢāļĄāļāļāļīāļŠāļąāļĄāļāļąāļāļāđāļĢāļ°āļŦāļ§āđāļēāļāļĢāļāđāļāđāļĨāļ°āđāļāļĢāļāļŠāļĢāđāļēāļāļŠāļ°āļāļēāļāđāļāđāļāļĒāđāļēāļāļĄāļĩāļāļĢāļ°āļŠāļīāļāļāļīāļ āļēāļ āđāļāļĒāļŠāļēāļĄāļēāļĢāļāļāļģāđāļāļāļĢāļ°āļĒāļļāļāļāđāđāļāđāļ§āļīāđāļāļĢāļēāļ°āļŦāđāļāļĪāļāļīāļāļĢāļĢāļĄāļāļāļāļĢāļ°āļāļāđāļāļŠāļ āļēāļ§āļ°āļāļ·āđāļāđ āđāļāđāđāļāđāļ āļāļēāļĢāđāļāļĨāļĩāđāļĒāļāļĢāļ°āļāļąāļāļāļ§āļēāļĄāđāļĢāđāļ§āļāļāļāļĢāļāđāļ āļāļēāļĢāđāļāļĨāļĩāđāļĒāļāđāļāļĨāļāļĢāļđāļāđāļāļāļāļāļāļŠāļ°āļāļēāļ āļāļ§āļēāļĄāđāļĄāđāļŠāļĄāđāļģāđāļŠāļĄāļāļāļāļāļāļīāļ§āļāļēāļāđāļāļĢāļđāļāđāļāļāļāđāļēāļāđ āđāļāđāļāļāđāļThis research aims to analyze the interaction response between trains and bridges by using Finite Element Method (FEM) and Multibody Co-simulation model. The bridges and trains details were obtained from Thailand Airport Rail Link Project. In addition, actual tests were carried out by installing devices on the bridge to measure the vibration as the train passed. The tested results were used for comparison with the results from the mathematical models developed. It was founded that, the results of vibration mode and mid-span deflection from field experiment and numerical simulation are in good agreement. However, the significant differences of the bridge acceleration were found in some range of train speed. Those differences between bridge acceleration results may be caused by the effects of track irregularity and the condition of track components. This research has been shown that the finite element model with multi-body model can be applied for prediction of the behaviors of train-bridge dynamic interaction, effectively. Furthermore, this technique can also be applied to analyze the behaviors of the system in other conditions, such as variation of the train speed, bridge configuration as well as degree of track Irregularity, etc
Use of viscoelastic polymer sheet as an acoustic control treatment in ceramic tiles to improve sound insertion loss
Ceramic tiles are commonly used in non-structural components of a building such as walls, partitions, floors, and roofs. However, due to their high surface hardness and density, ceramic tiles are not an ideal soundproof material. To improve the sound properties, this study introduced the use of a viscoelastic polymer sheet (VPS) as an acoustic control treatment. The VPS was attached to ceramic tiles in 4 different patterns: X, Cross, Corner, and Strip. The ceramic tiles with VPS were tested for the damping property and sound insertion loss (IL) and then compared to the ones without VPS. Results indicated that the attachment of VPS improved the damping property of the ceramic tiles. All tiles with VPS exhibited higher damping loss indexes than the ones with no VPS. The highest damping loss index of 0.017â0.018 was observed in the specimens with VPS in X and Cross patterns. In the case of IL, the performance of all ceramic tiles was indifferent when tested at sound frequencies smaller than 1000Â Hz. At the sound frequencies above 1000Â Hz, the best performance was observed in the specimen with VPS in the Cross pattern, followed by X, Strip, and Corner patterns, respectively. This concluded that the use of VPS can improve the damping property of a ceramic tile which also leads to the improvement in sound insertion loss