بهبود شناسایی ویژگی های دینامیکی سازه اسکله از طریق اعمال بهینه جهت بار ضربه : رویکرد شناسایی زیرفضای تصادفی برای آشکارسازی مودهای غالب

This study investigates the effectiveness of impact load application in revealing the dynam-ic characteristics of a wharf structure. Finite element analysis was conducted to simulate impact loads time history analysis in the x, y, and z directions, both individually and simul-taneously. Accelerations were extracted at nine points on the structure and processed using stochastic subspace identification (SSI) to determine mode shapes and vibration frequen-cies. The results were compared to those obtained from modal analysis to assess the success of stimulation in different directions. It was found that simultaneous application of impact loads in all three directions effectively excites the structure in all directions, leading to the extraction of more frequencies and mode shapes. While this approach may not be universal-ly applicable, it is recommended for structures where it is feasible such as wharf structures. These structures are subjected to the impact of mooring vessels. So, it enhances the extrac-tion of dynamic characteristics.