Research on Lectotype Design of Transparent Sound Barrier Unit Plate of High-speed Railway
The transparent sound barrier unit plate is one of the common types of high-speed railway acoustic components.As a trackside facility,it withstands train aerodynamic loads for a long time and affects the safety of railway operations.In the lectotype design process of the transparent sound barrier unit plate,there are still many issues such as unclear anti load indicators and the neglect of determining the thickness of the transparent material.To address the above issues,this paper provided recommendations for the selection of commonly used transparent materials such as glass and acrylic under different usage scenarios and speed target values by analyzing the indicators of sound insulation,combustion performance,load resistance,and impact resistance of the transparent sound barrier unit plate.This paper analyzed the values and working conditions of train aerodynamic load,restrictive wind speed load,and natural wind load for the sound barrier of high-speed railways,and proposed the deformation resistance,fracture resistance,and fatigue resistance indicators of the transparent sound barrier under different working conditions.In addition,calculations were conducted to study the sound insulation,impact resistance performance,and deflection of the transparent sound barrier unit plate,the size of the profile and the corresponding thickness of different transparent materials under different working conditions were given.Research shows that,the impact resistance performance controled the thickness of laminated glass transparent plates of conventional size specifications,and it was recommended that their thickness not be less than(10+0.76+10)mm.In typhoon areas,it was recommended to increase the thickness of laminated glass to(11+0.76+11)mm for bridge sections with a size of 2000 mm×1960 mm.The thickness of acrylic material was related to the size of the transparent sound barrier plates.The impact resistance performance controled the thickness of the transparent material for small sizes of 500 mm×1960 mm acrylic sound barrier plates,and it was recommended that its thickness be not less than 15 mm;Deflection controled the thickness of the transparent material for large-sized acrylic sound barrier plates with a size of 1000×1960 mm or above.When applying the 1000 mm×1960 mm acrylic sound barrier plates to bridge sections,it was recommended that its thickness larger than 18 mm under a speed of 350 km/h,and not less than 20 mm under typhoon conditions.
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维普
