Experimental and Theoretical Analysis for Isolation Performance of New Combined Isolation Devices under Blast Loading

The strong shock and vibration effect caused by explosion may pose a serious threat to the surrounding environment and the safety of personnel and equipment. This also makes the problem of vibration isolation and absorption of the structures subjected to blast loading increasingly prominent. In this paper, three kinds of new combined isolation devices with high resistance are designed and manufactured, and the characteristic parameters such as natural vibration period, frequency, and damping ratio are obtained through drop hammer impact test. Based on the Duhamel integral principle, analytical solutions of dynamic response of the combined isolation devices under rectangular pulse blast loading are derived, and the calculation expressions of transmissibility and vibration isolation rate are proposed. Combined with the test results, the isolation performance of three kinds of combined isolation devices under blast loading is obtained by using the theoretical calculation formula, and the influencing factors of isolation performance are further analyzed parametrically. The research results provide a reference for the application of combined isolation devices in isolation and shock absorption of structures under blast loading.