Digital Hydraulic Winch Drives

Larsen, Henrik; Kjelland, Magnus B.; Holland, Anders; Lindholdt, Per N.

doi:10.1115/fpmc2018-8858

Cited by 5 publications

(3 citation statements)

References 0 publications

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“…Although this method enhanced the displacement resolution compared to an FSD strategy, it was unclear whether the same technique could be applied to a DDM. A unique method, termed "creep mode", was presented by Larsen et al [19] for managing DDMs at exceptionally low speeds. This method, falling under the sequential partial-stroke category, relies on the gradual movement of the motor's shaft from one-moment equilibrium to another by selectively pressurizing or depressurizing one chamber at a time.…”

Section: Winch Drivementioning

confidence: 99%

Determining the Optimal Number of Pistons for Offshore Digital Winch Drives

Farsakoglou,

Pedersen,

Ebbesen

et al. 2023

Energies

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In offshore winch drive applications, determining the required number of pistons in digital displacement motors is critical for minimizing torque ripples. Digital displacement motors have shown promise for improving energy efficiency for offshore operations, such as placing equipment on the seabed or mineral drilling. However, they are known for exhibiting significant torque ripples, which can affect load-handling precision. This paper estimates the required number of pistons for realizing a digital hydraulic winch drive based on information from a commercial winch. The proposed drive employs full-stroke displacement strategies at high speeds and partial-stroke at low speeds. By simulating steady-state operations, this study correlates torque output with position oscillations. The results show that 37 pistons are required to keep position oscillations below a benchmark threshold of 10 mm throughout the drive’s operating range to avoid hindering the drive’s performance. However, such a high piston count could result in high costs due to the large, expensive valves required for partial-stroke operations. Therefore, this paper suggests an alternative drive topology for future research, which could potentially reduce the number of pistons that are operated with partial strokes.

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Section: Winch Drivementioning

confidence: 99%

Determining the Optimal Number of Pistons for Offshore Digital Winch Drives

Farsakoglou,

Pedersen,

Ebbesen

et al. 2023

Energies

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show abstract

“…Each cylinder is provided with two main poppet valves, and each valve is Pilot operated by a 3/2 spool valve. Moreover, a group of researchers from Diinef company, MacGregor company, and the University of Agder, attempted to broaden the usage of digital displacement high torque low-speed motors; the objective was to drive large winches in offshore and maritime applications (150-ton range) by employing fast-acting Pilot valves [131].…”

Section: Miscellaneous Pilot Operated Componentsmentioning

confidence: 99%

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Elsaed,

Linjama

2023

TJFP

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Hydraulic systems have been widely used due to their high power-to-weight ratio. Despite the growing instances of being superseded by the electromechanical counterparts at low power levels, the market was incapable of presenting alternatives for large-size applications. Additionally, in recent years, the demand for more significant heavy machinery (Mobile & Industrial) has increased, which led to the necessity of even higher flow and pressure Pilot-operated valves, despite the fact that these valves have several issues. One might think the alternative could be developing a hydraulic system that does not rely on Pilot-operated valves, but after decades of research, these systems could not get close to the performance of Pilot-operated Multistage valves. The paper presents a comprehensive study of the progress accomplished from the year 2016 to early 2022 in hydraulic Pilot-operated valves; they are widely employed among ordinary valves, proportional valves, and state-of-the-art digital hydraulics. Higher efficiency will be a primary factor in the success of the new designs. The academia presented several studies to improve the Pilot valves’ performance, but still, they are limited. There are no dramatic developments, and there are only a few upgrades.

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“…For very-low speeds, the sequential partial-stroke strategy offers a fast response which is limited only by the actuation time of the valves, but energy losses are significantly increased. A method that is referred to as creep mode was introduced by Larsen et al (2018) for controlling DDMs at very low speeds. The method belongs to the sequential partial-stroke category and relies on slowly moving the motor's shaft from one force equilibrium to the next by pressurizing or depressurizing one chamber at a time.…”

Section: Introductionmentioning

confidence: 99%

Improving Energy Efficiency and Response Time of an Offshore Winch Drive with Digital Displacement Motors

Farsakoglou,

Pedersen,

Ebbesen

et al. 2023

MIC

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Offshore winch drives require high energy efficiency and control precision, making digital displacement motors an attractive solution due to their high efficiency and potential controllability. However, the response time and the realized energy efficiency of these motors are heavily dependent on the chosen displacement control strategy, especially at low-speed operation. This paper considers various displacement control strategies to investigate whether digital displacement motors are a viable solution for offshore winch drive applications. The motor specifications are derived based on the requirements of a commercial offshore winch drive system. The analysis reveals that various displacement control strategies should be used across the drive's operational speed range to ensure both satisfactory performance and high efficiency. Full-stroke and partial-stroke strategies are optimal for speeds above 28 rpm and 20 rpm, respectively, but unsuited for lower-speed operation. For speeds below 20 rpm, an improved sequential-stroke strategy is therefore presented. The proposed displacement control strategy provides instantaneous motor response and maintains high energy efficiency, although its robustness is slightly reduced at higher operating speeds above 20 rpm.

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Digital Hydraulic Winch Drives

Cited by 5 publications

References 0 publications

Determining the Optimal Number of Pistons for Offshore Digital Winch Drives

Determining the Optimal Number of Pistons for Offshore Digital Winch Drives

A Review of Pilot-operated Hydraulic Valves – Development, Challenges, and a Comparative Study

Improving Energy Efficiency and Response Time of an Offshore Winch Drive with Digital Displacement Motors

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