钢弹簧失能下车辆-浮置板轨道耦合系统动力特性研究

Study on Dynamic Characteristics of Vehicle Floating Slab Track Coupling System With Steel Spring Deactivation

在列车荷载作用下浮置板轨道会发生钢弹簧失能,为研究此问题对车辆-浮置板轨道系统动力特性的影响,基于车辆-轨道动力学理论,建立车辆-浮置板轨道耦合动力学模型,研究不同钢弹簧失能数量、位置、组合形式对车辆-浮置板轨道系统动力响应的影响。结果表明:当钢弹簧失能数量相同时,同一块浮置板的振动响应板中位置大于板端位置;钢弹簧失能1个时,板中位置钢轨、浮置板位移最大值分别比板端位置大0.49 mm和0.22 mm,加速度有效值分别比板端位置大13.34%和21.42%;单侧连续失能钢弹簧数量≥2个时,列车荷载作用下钢轨和浮置板垂向位移最大值均分别超出《浮置板轨道技术规范》规定的限值4 mm和3 mm;车体在频域上的振动响应主要集中在10 Hz内,钢弹簧失能会导致车体振动响应在频域上增大;单侧钢弹簧失能2个比双侧失能2个的钢轨位移最大值、加速度有效值分别增大17.75%、2.22%,比正常状态下钢轨位移、加速度分别增大37.08%,10.84%。钢弹簧失能增加了系统的振动响应,影响减振效果,应注意及时检修。

Under the action of train load,the steel spring of the floating slab track will lose energy.In order to study the influence of this problem on the dynamic characteristics of the vehicle floating slab track system,based on the vehicle track dynamics theory,a vehicle floating slab track coupling dynamics model is established to study the influence of the number,location and combination form of steel spring energy loss on the dynamic response of the vehicle floating slab track system.The results show that the vibration response of the same floating plate is greater in the middle of the plate than that in the end of the plate when the number of steel spring energy loss is the same;When the steel spring loses energy,the maximum displacement of the rail and the floating plate is 0.49 mm and 0.22 mm larger than that of the plate end respectively,and the effective value of the acceleration is 13.34%and 21.42%larger than that the plate end respectively;When the number of continuously disabled steel springs on one side is more than or equal to 2,the maximum vertical displacement of steel rails and floating plates under train load exceeds the limits of 4 mm and 3 mm respectively specified in the Technical Specifications for Floating Slab Track;The vibration response of the car body in the frequency domain is mainly concentrated in 10 Hz,and the failure of the steel spring will lead to the increase of the vibration response of the car body in the frequency domain;The maximum rail displacement and effective value of acceleration of two disabled steel springs on one side are 17.75%and 2.22%higher than those of two disabled steel springs on both sides,and the rail displacement and acceleration under normal conditions are 37.08%and 10.84%higher than those under normal conditions.The loss of energy of the steel spring increases the vibration response of the system and affects the damping effect,so attention should be paid to timely maintenance.