Application and optimization design of non-obstructive particle damping-phononic crystal vibration isolator in viaduct structure-borne noise reduction

非阻塞性颗粒阻尼声子晶体隔振器在高架桥结构噪声控制中的应用与优化设计

The problems associated with vibrations of viaducts and low-frequency structural noise radiation caused by train excitation continue to increase in importance.A new floating-slab track vibration isolator-non-obstructive particle damping-phononic crystal vibration isolator is proposed herein,which uses the particle damping vibration absorption technology and bandgap vibration control theory.The vibration reduction performance of the NOPD-PCVI was analyzed from the perspective of vibration control.The paper explores the structure-borne noise reduction performance of the NOPD-PCVIs installed on different bridge structures under varying service conditions encountered in practical engineering applications.The load transferred to the bridge is obtained from a coupled train-FST-bridge analytical model considering the different structural parameters of bridges.The vibration responses are obtained using the finite element method,while the structural noise radiation is simulated using the frequency-domain boundary element method.Using the particle swarm optimization algorithm,the parameters of the NOPD-PCVI are optimized so that its frequency bandgap matches the dominant bridge structural noise frequency range.The noise reduction performance of the NOPD-PCVIs is compared to the steel-spring isolation under different service conditions.

列车激励引起高架桥振动,从而产生低频桥梁结构噪声的问题持续增加。前一系列文章基于颗粒阻尼吸振技术和带隙阻振理论,提出了一种名为非阻塞性颗粒阻尼声子晶体隔离器(NOPD-PCVI)的新型浮置板轨道隔振器,并从振动控制的角度对其减振性能进行了分析。本文联系实际工程问题,以不同桥梁结构形式的桥梁结构噪声为切入点,探究NOPD-PCVI在不同服役条件下的降噪性能。通过建立不同桥梁结构形式的列车-浮置板轨道-桥梁耦合分析模型获得传递至桥梁的荷载,再借助有限元法进行振动响应分析,并通过频域边界元法计算桥梁结构噪声。基于粒子群优化算法,通过计算出的列车-钢弹簧浮置板轨道-桥梁耦合模型的桥梁结构噪声主频反演出NOPD-PCVI的带隙频段,并进一步对比了不同服役状态下NOPD-PCVI相对于钢弹簧的降噪性能。