|
Steel turnout sleepers is a special form of turnout sleepers , mainly used for the turnout traction point , the turnout electric service switching lever is placed in the pillow , is conducive to large machine maintenance operation . However, due to its special structure and force manner will result in the adjacent concrete turnout sleepers stiffness does not match , the formation of the longitudinal stiffness of the track irregularity . To reduce the track when the train passes irregularity , it is necessary analysis of the vibration characteristics of the steel turnout sleepers . Firstly steel turnout sleepers and concrete turnout sleepers mechanical model . Fasteners of the model will be simplified as a spring-damper elements , sleepers as a rigid block , sleepers and track bed and subgrade simplified as a system of incentives for the spring-damper element , rail sinking displacement . Steel turnout sleepers model , pillow into two groups fasteners , the suboccipital track bed for two eccentric bearing has ups and downs and roll two degrees of freedom ; the concrete the turnout sleepers model , pillow for a set of fasteners , suboccipital track bed for a little eccentric support , only one degree of freedom - ups and downs . According to the mechanical model were established steel turnout sleepers with concrete turnout sleepers vibration ordinary differential equations, derive the transfer function of the system . Transfer function , the vibration characteristics of the two are compared and analyzed . According to the system response transfer function is obtained , the parameters of the steel turnout sleepers . Quality, fasteners and cushion stiffness , track bed and subgrade stiffness parameters in the frequency domain , the impact on the steel turnout sleepers vibration characteristics . Summed up : increase quality, reduce the fasteners and cushion stiffness , increasing the track bed and subgrade stiffness , steel turnout sleepers with concrete sleepers dynamic response of the gap can be reduced , reducing the track longitudinal irregularity .
|