Mechanical Properties Of A Rubber Vibration Isolator Under Pressure And Shear

In recent years, along with the construction of the rail transit around the urban, vibration and noise gradually become problems during the early stage of design, the process of construction and operation stages. Although various types of shock absorber products have been applied in the urban rail transit construction project, many problems still exist on technologies of reduce the vibration and noise.A new type of vibration isolator is designed to work under pressure and shear which is similar to track vibration damping fasteners and its construction method is similar with the steel spring vibration isolator. The new type of rubber vibration isolator are introduced and analyzed in the paper, and the main contents are as follows:First of all, introduce the vibration and noise reduction measures which are commonly used in civil engineering and rail transit. Introduce the common characteristics of floating slab track system.Secondly, expound the damping performance of rubber material. Introduce the principle and advantages of compression damping fasteners, shear vibration damping fasteners and compression-shear vibration damping fasteners. Compare construction characteristics and advantages of steel spring floating slab and rubber vibration isolator floating slab. The test shows that devices of the rubber vibration isolation devices are better than rubber pads’on reduction of vibration and noise reduction.Then, build finite element model of the vibration isolator, mainly analyses the basic stress of the vibration isolator and parameters of the rubber structure. Vibration isolator under vertical load, the stress of the rubber is the main factor affecting the whole structure design. The maximum Von Mises stress and the maximum stress strength of the rubber occurred both on the contact area with metal parts. In order to ensure the safe operation of the vibration isolator, the thickness of the rubber shouldn’t be more than 53 mm and the angle of the rubber should be between 55 ° and 61 °.Finally, the stiffness and damping of the vibration isolator are analyzed. Analysis shows that elastic modulus of the rubber is the main parameter of the stiffness of the vibration isolator. Change the thickness of the rubber can effectively adjust the vibration isolator stiffness, and the influence of rubber Angle is little; The transverse stiffness of the rubber vibration isolator is small, so when set up the rubber vibration isolator, lateral limit device is necessary; Optimize the thickness of the vibration isolator, the damping performance can be optimized in a certain degree, but the effect of the angle is little.