CAJ | 학술논문

针对城市轨道交通常规减振型轨道结构在低频域(<30 Hz)范围内因共振放大低频振动的现象，提出一种被动式动力减振轨道结构。基于扩展定点理论和有限单元法，利用最优同调和最优阻尼条件，得到抑制浮置板轨道1阶模态振动的最优刚度和阻尼。以短型钢弹簧浮置板轨道为例，建立车辆-被动式动力减振浮置板轨道耦合动力学模型。计算结果表明：被动式动力减振浮置板可有效抑制13 Hz(短型浮置板1阶固有频率)附近的振动加速度，质量比为0.2时被动式动力减振浮置板使13 Hz 处振动降低12 dB；被动式动力减振浮置板使弹簧支点反力在13 Hz 附近的峰值明显降低，有效降低传递至周围建筑物的低频振动；被动式动力减振浮置板轨道结构的质量比越大，其对1阶模态振动的减振效果越好。
침대성시궤도교통상규감진형궤도결구재저빈역(<30 Hz)범위내인공진방대저빈진동적현상，제출일충피동식동력감진궤도결구。기우확전정점이론화유한단원법，이용최우동조화최우조니조건，득도억제부치판궤도1계모태진동적최우강도화조니。이단형강탄황부치판궤도위례，건립차량-피동식동력감진부치판궤도우합동역학모형。계산결과표명：피동식동력감진부치판가유효억제13 Hz(단형부치판1계고유빈솔)부근적진동가속도，질량비위0.2시피동식동력감진부치판사13 Hz 처진동강저12 dB；피동식동력감진부치판사탄황지점반력재13 Hz 부근적봉치명현강저，유효강저전체지주위건축물적저빈진동；피동식동력감진부치판궤도결구적질량비월대，기대1계모태진동적감진효과월호。
In view of vibration attenuation track structure in urban rail transit that is subject to resonance-in-duced amplification of low frequency vibration in the low frequency domain (<30 Hz),this paper presented a passive dynamic damping floating slab track structure(PDD-FST).Based on the extended fixed-point theory and the finite element method,using optimal homology and optimal damping conditions,the optimal stiffness and damping coefficients were obtained to inhibit the first order modal vibration of the conventional floating slab track.The vehicle-PDD-FST coupling model was established against the case of short steel spring floating slab track (SSS-FST).The results showed that PDD-FST could effectively suppress the vibration acceleration at 13 Hz (first order natural frequency of SSS-FST).When the mass ratio was 0.2,PDD-FST reduced the vi-bration acceleration at 13 Hz by up to 12 dB.PDD-FST significantly decreased the peak value of the spring sup-porting reaction at 13 Hz,thereby effectively reducing the transfer of the low frequency vibration to surrounding buildings.The greater the mass ratio of PDD-FST was,the better damping effect it imposed on first modal vi-bration.