Vibration Attenuation on HEPS Bare Ground with Different Frequencies

High Energy Photon Source (HEPS) has rigorous restrictions on the vibration levels of the storage ring slab. If the vibration level exceeds the specification limit, it can impact the normal operation of the equipment and influence the sampling efficiency of the experimental terminal. With grandually increasing constructions of the surrounding urban infrastructure, to control the outer vibration sources, it is necessary to study the vibration propagation characteristics on HEPS site. For evaluating the impact of external vibrations on the critical components of HEPS, a series of measurements have been conducted. A shaker was used to artificially generate vertical sinusoidal excitations with frequencies 7Hz up to 100 Hz. The vibration responses were measured along the bare ground, the vibration attenuation of different frequencies are analyzed. A decay formula together with the range of key parameters are obtained according to the fitting results of the measurement data. In the meanwhile, the attenuation formula is validated by the vibration data of a 50t crane traveling on HEPS site. The measurement data fitted nicely with the above mentioned fitting formula. The discrepancy between the measured data and the fitted curve are within 35%. This study will be a basis for the establishment of related regulation for external travel loads around HEPS campus and in the meanwhilie it will provides as a reference for the research methodology of the vibration propagation on the ground.