CAJ | 학술논문

以WJ7-A型轨下垫板为对象,测试轨下胶垫刚度随服役时间的变化,分析垫板刚度的时变特性；然后以此为基础,建立车辆-轨道垂向耦合动力学模型,研究轨下胶垫时变特性对轮轨随机振动响应的影响规律。研究结果表明：随着服役时间的增长,轨下橡胶垫板的刚度将增大,2年后垫板刚度的增幅为13.91%；随着运营时间的增长,车体振动加速度变化微弱；轮轨力及扣件力的第二主频幅值增大并向高频移动,且扣件力变化更显著,线路运营2年时间后,扣件力第二主频向高频移动7.4 Hz,幅值增幅达到53.80%。建议定期抽样测试轨下胶垫刚度并及时更换性能老化垫板,降低轮轨垂向力和扣件力。
이WJ7-A형궤하점판위대상,측시궤하효점강도수복역시간적변화,분석점판강도적시변특성；연후이차위기출,건립차량-궤도수향우합동역학모형,연구궤하효점시변특성대륜궤수궤진동향응적영향규률。연구결과표명：수착복역시간적증장,궤하상효점판적강도장증대,2년후점판강도적증폭위13.91%；수착운영시간적증장,차체진동가속도변화미약；륜궤력급구건력적제이주빈폭치증대병향고빈이동,차구건력변화경현저,선로운영2년시간후,구건력제이주빈향고빈이동7.4 Hz,폭치증폭체도53.80%。건의정기추양측시궤하효점강도병급시경환성능노화점판,강저륜궤수향력화구건력。
With respect to WJ7-A rail pad, the change of rail pad stiffness with service time is tested and the time variant characteristics of rail pad stiffness are analyzed. The vehicle-track vertical coupling dynamic model is established based on the test results, the effects of time variant characteristics of rail pad stiffness on the random vibration responses of wheel-rail system are studied. The results show that the stiffness of the rail pad increases with the increasing of the service time, and the increase amplitude is about 13. 91% after 2 years. The vibration acceleration of vehicle fluctuates slightly with the extension of the operating time. The second dominant frequency of wheel-rail force and fastening force increase and move to a higher frequency and the fastening force changes significantly. After two years of operation, the second dominant frequency of fastening force moves by 7. 4Hz to a higher frequency, and the amplitude increases by 53. 80%. In order to reduce wheel-rail force and fastening force, it is recommended to test regularly the stiffness of the rail pad by sampling and replace the aging pads timely.