Design of the Depth Controller for a Floating Ocean Seismograph

Huang, Haocai; Zhang, Chenyun; Ding, Weiwei; Zhu, Xinke; Sun, Gui-Qing; Wang, Hangzhou

doi:10.3390/jmse8030166

Cited by 10 publications

(10 citation statements)

References 25 publications

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“…Low background noise near the SOFAR (sound fixing and ranging channel) layer allows for detection of information-rich seismic P waves [1,11,12]. After the AGMS is placed in the appropriate sea area, when the large earthquake signal (≥6 magnitude) is collected at the hovering depth or after reaching the working cycle, it will automatically float and communicate with the monitoring center for data transmission.…”

Section: Design Indicators and Working Modalitiesmentioning

confidence: 99%

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Li,

Zhu,

Qin

et al. 2023

JMSE

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Mobile Earthquake Recording in Marine Areas by Independent Divers (MERMAID) provides a possibility for long-term and large-scale observation of natural seismic P waves, but it does not have mobility and can only drift with ocean currents, resulting in observation equipment locations that are too sparse or too dense, both of which are not suitable for network observation. Therefore, this paper developed a new type of Autonomous Glide Marine Seismometer (AGMS) with mobility and the ability to adjust the observation position. The AGMS adopts a flying saucer shape, which has better hydrodynamic characteristics and better motion stability. This paper focused on the material, shape, and structure of the pressure-resistant shell for the selection of design and strength checking research. Using the finite element analysis method and introducing the initial defect, the results showed that the yield strength of the pressure-resistant shell decreases with the initial defect value. The calculation results were compared and analyzed with the relevant theoretical formulas and specification calculation results, and all the results met the design requirements. The results of this design could also provide reference for the design of related deep-sea pressure chambers.

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Section: Design Indicators and Working Modalitiesmentioning

confidence: 99%

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Li,

Zhu,

Qin

et al. 2023

JMSE

Self Cite

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“…Volumetric control techniques include electromechanical and electro-hydraulic systems (Carneiro et al , 2019). Electro-hydraulic solutions are typically hydraulic systems consisting of pumps and drive motors, valves, external reservoirs and internal reservoirs (Huang et al , 2020; Tiwari and Sharma, 2021). In Liu et al (2015), a hydraulic buoyancy system based on a swash-plate type axial piston pump was developed.…”

Section: Introductionmentioning

confidence: 99%

Design and extensibility analysis of a variable buoyancy system for small autonomous underwater vehicles

Xia,

Li,

Zang

et al. 2024

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Purpose A switching depth controller based on a variable buoyancy system (VBS) is proposed to improve the performance of small autonomous underwater vehicles (AUVs). First, the requirements of VBS for small AUVs are analyzed. Second, a modular VBS with high extensibility and easy integration is proposed based on the concepts of generality and interchangeability. Subsequently, a depth-switching controller is proposed based on the modular VBS, which combines the best features of the linear active disturbance rejection controller and the nonlinear active disturbance rejection controller. Design/methodology/approach The controller design and endurance of tiny AUVs are challenging because of their low environmental adaptation, limited energy resources and nonlinear dynamics. Traditional and single linear controllers cannot solve these problems efficiently. Although the VBS can improve the endurance of AUVs, the current VBS is not extensible for small AUVs in terms of the differences in individuals and operating environments. Findings The switching controller’s performance was examined using simulation with water flow and external disturbances, and the controller’s performance was compared in pool experiments. The results show that switching controllers have greater effectiveness, disturbance rejection capability and robustness even in the face of various disturbances. Practical implications A high degree of standardization and integration of VBS significantly enhances the performance of small AUVs. This will help expand the market for small AUV applications. Originality/value This solution improves the extensibility of the VBS, making it easier to integrate into different models of small AUVs. The device enhances the endurance and maneuverability of the small AUVs by adjusting buoyancy and center of gravity for low-power hovering and pitch angle control.

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“…The design of an autonomous underwater vehicle's control system takes into account many factors: stability, robustness, and the ability to change parameters, which itself requires adaptive capability due to sensor noise, disturbances caused by sea currents and waves, and changes in autonomous underwater vehicle dynamics. There are many controller models of autonomous underwater vehicles that have been proposed, including linear controllers such as PID [4], linear quadratic regulators, and linear quadratic Gaussian [5,6]. These controllers have produced better performance when the autonomous underwater vehicle is operating as a linear model.…”

Section: Introductionmentioning

confidence: 99%

Overshoot Reduction Using Adaptive Neuro-Fuzzy Inference System for an Autonomous Underwater Vehicle

Nayak¹,

Das

Panigrahi

et al. 2023

Mathematics

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In this paper, an adaptive depth and heading control of an autonomous underwater vehicle using the concept of an adaptive neuro-fuzzy inference system (ANFIS) is designed. The autonomous underwater vehicle dynamics have six degrees of freedom, which are highly nonlinear and time-varying. It is affected by environmental effects such as ocean currents and tidal waves. Due to nonlinear dynamics designing, a stable controller in an autonomous underwater vehicle is a difficult end to achieve. Fuzzy logic and neural network control blocks make up the proposed control design to control the depth and heading angle of autonomous underwater vehicle. The neural network is trained using the back-propagation algorithm. In the presence of noise and parameter variation, the proposed adaptive controller’s performance is compared with that of the self-tuning fuzzy-PID and fuzzy logic controller. Simulations are conducted to obtain the performance of both controller models in terms of overshoot, and the rise time and the result of the proposed adaptive controller exhibit superior control performance and can eliminate the effect of uncertainty.

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Design of the Depth Controller for a Floating Ocean Seismograph

Cited by 10 publications

References 25 publications

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Optimized Design of the Carrier Structure of an Autonomous Glide Marine Seismometer

Design and extensibility analysis of a variable buoyancy system for small autonomous underwater vehicles

Overshoot Reduction Using Adaptive Neuro-Fuzzy Inference System for an Autonomous Underwater Vehicle

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