Design of Attack Resistant Robust Control Based on Intermediate Estimator Approach for Offshore Steel Jacket Structures

Concerning the introduction of communication networks in offshore steel jacket structures (OSJSs), cyber-attacks can manifest in the system model. The present study endeavors to look at the state and attack reconstruction issues of offshore steel jacket structures in the presence of parameter uncertainties, wave exciting forces, and cyber-attacks. First, to concurrently reconstruct the state and attacks, an intermediate observer based on an intermediate variable is developed. During this phase, a logarithmic quantizer is put into use to facilitate the intermediate observer's performance by quantizing the output signals. Second, with the concourse of the reconstructed terms, a resilient robust controller is developed, thereby rendering it possible to make amends for attacks that come up in the system. Third, using Lyapunov stability theory, the linear matrix inequality (LMI) technique, and dissipative theory, the appropriate criteria for confirming the states of assayed system are bounded. In the end, simulation outcomes are provided to validate the precision of the results reported. According to the simulation findings, the setup intermediate observer assists in offering precise state and attack reconstruction. Further, the presented resilient robust controller can compensate for attacks presented in the system model.