Hydraulic vs. Electric: A Review of Actuation Systems in Offshore Drilling Equipment

Pawlus, Witold; Choux, Martin; Hansen, Michael Rygaard

doi:10.4173/mic.2016.1.1

Cited by 14 publications

(12 citation statements)

References 80 publications

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“…Due to an increasing focus on the environmental impact and reducing the energy consumption, alternating current (AC) motor drives tend to replace hydraulic motors, resulting in advantages such as increased accuracy and energy efficiency, reduced maintenance, and elimination of fluid spills, according to Pawlus et al (2016a).…”

Section: Electrification Of Powertrains Of Omsmentioning

confidence: 99%

“…However, because of the traditional prevalence of hydraulic drives over electric actuators in translational motion control applications (mainly related to higher force densities available from the former solution), the remaining hydraulic drives on majority of offshore drilling equipment are thereby the hydraulic cylinders (Pawlus et al, 2016a). On the other hand, rotational motion control applications are being gradually dominated by electric motor drives, as illustrated by numerous examples from marine, and oil and gas industries.…”

Section: Electrification Of Powertrains Of Omsmentioning

confidence: 99%

“…Finally, factors such as safety and environment, cost, maintenance, operation in sensitive regions, potential of automation, and applicability to subsea infrastructure should all affect selection of the most suitable components of actuation systems of OMS -refer to Pawlus et al (2016a) and the references therein for a more detailed discussion on the above topics.…”

Section: Design Criteria and Challengesmentioning

confidence: 99%

“…Due to an increasing focus on the environmental footprint and energy consumption, offshore oil and gas industry is experiencing a shift in drive systems as highly efficient electric drives tend to replace less efficient hydraulic drives. A review of drive systems encountered in offshore drilling applications is presented by Pawlus et al (2016a), specifically focusing on giving a comparison of hydraulic and electric rotary drivetrains along with detailed explanations of their advantages and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Feasibility Study of Electromechanical Cylinder Drivetrain for Offshore Mechatronic Systems

Hagen¹,

Pawlus²,

Ebbesen³

et al. 2017

MIC

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Currently, there is an increasing focus on the environmental impact and energy consumption of the oil and gas industry. In offshore drilling equipment, electric motors tend to replace traditionally used hydraulic motors, especially in rotational motion control applications. However, force densities available from linear hydraulic actuators are still typically higher than those of electric actuators. Therefore, usually the remaining source of hydraulic power is thereby the hydraulic cylinder. This paper presents a feasibility study on the implementation of an electromechanical cylinder drivetrain on an offshore vertical pipe handling machine. The scope of this paper is to investigate the feasibility of a commercial off-the-shelf drivetrain. With a focus on the motion performance, numerical modeling and simulation are used when sizing and selecting the components of the considered electromechanical cylinder drivetrain. The simulation results are analyzed and discussed together with a literature study regarding advantages and disadvantages of the proposed solution considering the design criteria of offshore drilling equipment. It is concluded that the selected drivetrain can only satisfy the static motion requirements since the required transmitted power is higher than the recommended permissible power of the transmission screw. Consequently, based on the recommendation of the manufacturer, avoidance of overheating cannot be guaranteed for the drivetrain combinations considered for the case study presented in this paper. Hence, to avoid overheating, the average speed of the motion cycle must be decreased. Alternatively, external cooling or temperature monitoring and control system that prevents overheating could be implemented.

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Section: Electrification Of Powertrains Of Omsmentioning

confidence: 99%

Section: Electrification Of Powertrains Of Omsmentioning

confidence: 99%

Section: Design Criteria and Challengesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Feasibility Study of Electromechanical Cylinder Drivetrain for Offshore Mechatronic Systems

Hagen¹,

Pawlus²,

Ebbesen³

et al. 2017

MIC

Self Cite

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show abstract

“…Due to the increasing focus on the environmental impact, such as CO 2 emissions and oil spill pollution, inefficient state of the art hydraulic actuation tends to be replaced by electric drives in many industrial environments. This is the case, for instance, in offshore oil drilling [1]. However, hydraulic systems are still needed in load-carrying applications (e.g., knuckle-boom cranes or oil drilling equipment) because their force density is higher than that of their linear electro-mechanical counterparts and they do not present key issues related to reliability (e.g., strong impact forces) [2].…”

Section: Introductionmentioning

confidence: 99%

A Comparison Study of a Novel Self-Contained Electro-Hydraulic Cylinder versus a Conventional Valve-Controlled Actuator—Part 2: Energy Efficiency

2019

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This research paper presents the second part of a comparative analysis of a novel self-contained electro-hydraulic cylinder with passive load-holding capability against a state of the art, valve-controlled hydraulic system that is typically used in load-carrying applications. After addressing the control design and motion performance in the first part of the study, the comparison is now focused on the systems’ energy efficiency. It is experimentally shown that the self-contained solution enables 62% energy savings in a representative working cycle due to its throttleless and power-on-demand nature. In the self-contained drive, up to 77% of the energy taken from the power supply can be used effectively if the recovered energy is reused, an option that is not possible in the state of the art hydraulic architecture. In fact, more than 20% of the consumed energy may be recovered in the self-contained system during the proposed working cycle. In summary, the novel self-contained option is experimentally proven to be a valid alternative to conventional hydraulics for applications where passive load-holding is required both in terms of dynamic response and energy consumption. Introducing such self-sufficient and completely sealed devices also reduces the risk of oil spill pollution, helping fluid power to become a cleaner technology.

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Harmonic control of a dual‐valve hydraulic servo system with dynamically allocated flows

Xue

Chen

et al. 2022

Asian Journal of Control

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Modern industries face increasing demands to improve the precision and workability of equipment, leading to stringent requirements for hydraulic servo systems in terms of flow, accuracy, and output power. High‐flow servo valves and multi‐valve synchronous control methods have seen more applications in the industry to meet these demands. However, high‐flow servo valves are expensive and have unsatisfactory performance, and synchronous control methods require servo valves to have the same hydraulic characteristics, resulting in higher cost and lower accuracy of high‐flow hydraulic servo systems. Also, very little has been conducted on controlling single actuators using multiple valves. In this study, we design a novel dual‐valve hydraulic servo system structure with a high‐flow proportional directional valve that is connected in parallel with a low‐flow servo valve and further develop the mathematical model of this dual‐valve system. Next, a harmonic control scheme was proposed, which included a flow allocation layer and trajectory tracking layer. Thereby, we achieved optimal control of two valves, and robust performance was guaranteed. Finally, we investigate the relationships between the flows of two valves, the deadband of the proportional directional valve, and trajectory tracking errors. Experimental results show that the proposed control scheme can effectively adjust the output flow of each valve dynamically according to the tracking trajectory and the hydraulic characteristics of the two valves, and the tracking performance of the servo system is significantly improved. This method is promised to enable the realization of an economical, high‐flow, high‐precision hydraulic servo system that can be generally used in various fields, such as marine engineering and construction.

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Hydraulic vs. Electric: A Review of Actuation Systems in Offshore Drilling Equipment

Cited by 14 publications

References 80 publications

Feasibility Study of Electromechanical Cylinder Drivetrain for Offshore Mechatronic Systems

Feasibility Study of Electromechanical Cylinder Drivetrain for Offshore Mechatronic Systems

A Comparison Study of a Novel Self-Contained Electro-Hydraulic Cylinder versus a Conventional Valve-Controlled Actuator—Part 2: Energy Efficiency

Harmonic control of a dual‐valve hydraulic servo system with dynamically allocated flows

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