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 $H_{\infty }$ 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.
Highlights
As one of representative offshore platforms, the offshore steel jacket platform is primarily used in oil and gas extraction
The HDNHC is applied to an offshore platform, and the performance of the offshore platform with the HDNHC will be investigated
The designed HDNHC will be compared with the traditional H∞ controller (HIC) [7], an event-based networked H∞ controller (ENHC), and a time-based networked H∞ controller (TNHC), respectively
Summary
As one of representative offshore platforms, the offshore steel jacket platform is primarily used in oil and gas extraction. In the presence of sophisticated external disturbances such as wave, earthquake, and wind [1]–[3], offshore operations are often influenced by the excited excessive vibration amplitudes of the platform. Note that the corresponding service life can be extended beyond two times, when the vibration of the platform can be taken a 15 percent reduction [4]. The active control [5]–[10], passive control [11] and semi-active control [12] schemes are applied to the offshore platforms. To reduce vibration of the platform, a robust mixed H2/H∞ control strategy is proposed [13]. In [8] and [14], the offshore platform is modelled as an uncertain system and some integral sliding mode control schemes are developed. Due to the fact that offshore platforms are generally far from land, from the point of view
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