Static And Dynamic Analysis Of Rubber Isolators On Rapid Wagon

In the railway vehicle system, the application of rubber isolators tends to be widely used due to the good damping capability and the ability of absorbing vibration energy of rubber material. Rubber isolators was first used on the passenger cars. Recently, with the speed increase of freight cars and the confine codes of railway vehicle products that against noises coming out constantly, the application of rubber isolators on railway freight cars is increasing. Rubber isolators, such as the secondary lateral stop, the axle box rubber pad and the sheer rubber spring, can boost the performance of railway vehicle bogies, thus have a vital role to play in the bogie structure.In the late1980s, the double ring rubber spring as the main components of the primary suspension system of the DRRS bogie had played an important role in the performance improvement. A conical rubber, referring to the action mechanism of double ring rubber spring, was designed in this paper and is suitable for the rapid freight car bogies of speed160km/h. The design method was based on analytical calculation theory of rubber components and a programme based on the computer language FORTRAN was written to achieve the result.Considering the significant influence of the primary suspension system on the bogie performance, it is necessary to study the characteristics of the conical rubber spring. The characteristic study was divided in two parts, static and dynamic, both were conducted in the finite element software ABAQUS. In the static analysis part if we just mesh the part for one time, elements will have severe distortion after the calculation was finished due to the large deformation of rubber material, and according to FEA theory, the distortion elements may lead to inaccurate result. So while analyzing the static characteristics of conical rubber spring, re-mesh technique was used, the displacement load was split into several parts and the model was re-meshed after every load step, the Map Solution technique can keep the strain and stress continues. The result achieved under re-meshing technique suggested that reaction force had good continuity, the re-meshing technique provides a reliable calculating method for the large deformation problem.The dynamic analysis of conical rubber spring was mainly proposed to calculate the properties that frequency depended under constant amplitude displacement excitations. A hyperelastic-viscoelasitic model was established to study the frequency-dependency dynamic properties, and the properties was under vertical pre-load. We can achieve the force-displacement curve, also called hysteresis loop, of the model under harmonic load. The error caused by the static pre-load was discussed and the calculating method of parameters that represent dynamic properties rubber isolators was proposed. The analyze on the change rules of dynamic parameters, dynamic stiffness and damping angle, provided references for more in-depth study on rubber isolators.