Hybrid-Driven-Based H_∞ Control for Offshore Steel Jacket Platforms in Network Environments

Abstract

This paper investigates the hybrid-driven-based networked control for an offshore steel jacket platform subject to external wave forces. A hybrid driven strategy is introduced to deal with the problem of networked control for offshore platforms. Then, the networked closed-loop system is modeled as a stochastic delay system. Based on this model, a stability criterion is derived using the stochastic control theory and the Lyapunov-Krasovskii functional method. Simulation results show that the hybrid-driven-based networked H ∞ controller is effective to suppress the vibration of the platform and save the limited network resources as well. Moreover, the designed controller is flexible in terms of maintaining a balance between performance requirements of the offshore platform and the utilization of communication network bandwidth. INDEX TERMS Offshore platform, networked control system, H ∞ control, stochastic system, hybrid driven strategy.

Reinforcement learning-based optimal fault-tolerant control for offshore platforms

“…Our unique method for the faulty offshore platform requires much less control force than the FTC method discussed earlier 13 in both fault-free and faulty conditions. In comparison to existing works in the literature 13,17 and Cao et al, 9 the proposed method does not need the complete knowledge of the offshore platform. This is a significant advantage when the system’s internal dynamics are inaccessible due to the model uncertainties.…”

“…For instance, in Zhang and colleagues, 7,8 integrator sliding mode control (SMC) is employed for nonlinear steel-jacket offshore platforms when there are parameter perturbations. In Cao et al, 9 Hybrid-Driven-Based H Control is used for a linear offshore platform with irregular wave force. In Zhong et al, 10 with delayed control input, optimal vibration control is proposed for nonlinear offshore platforms.…”

Disturbance rejection‐based cluster synchronization of nonlinear complex dynamical networks with hybrid‐driven mechanism

“…Notably, a general system model with communication delay is established under hybrid-driven mechanism. [27][28][29] On the flip side, the external disturbances are inevitable in a control system that right away degrades the system performance, which in turn attracts the research interest among researchers. Many literature studies have put a light on sliding mode controller, 30 disturbance observer, 31 equivalent input disturbance, 32 and many other techniques to reduce the effect of the external disturbances and retain the control performance.…”

“…To be more specific, a switching mechanism is incorporated in the path between the sensor and the controller among two channels, in which the event‐triggered protocol is elected in the case when the transmission line bandwidth is over occupied, otherwise, the other channel is opted. Notably, a general system model with communication delay is established under hybrid‐driven mechanism 27‐29 …”

Online Frequency Estimation on a Building-like Structure Using a Nonlinear Flexible Dynamic Vibration Absorber

“…An in-wheel powertrain system using dynamic vibration absorbers for electric vehicles is discussed in [4]. Applications of these control devices on offshore platforms are presented in [5,6]. Torsional vibration suppression in the hybrid electric vehicle powertrain system of the single-shaft parallel type, using a dual mass flywheel with centrifugal pendulum dynamic vibration absorbers, is analyzed in [7].…”