Study of a Self-Contained Electro-Hydraulic Cylinder Drive

In civil engineering in Russia, trenching for utilities is currently under digging. To perform such works, it is necessary to use high-precision construction machinery, because inaccurate performance of works can lead to the break down of existing utilities, thereby affecting the residents of nearby houses and demanding the additional works for renewal.The most universal labour saver to perform construction works is hydraulic driven single-bucket excavators, which provide up to 38% of works. Therefore, to improve technical characteristics that affect the accuracy of the work performed is an important task.High requirements for the performance of works are defined by existing construction regulations: an allowable soil layer to remain is at most 0.05 m. To fulfil such requirements, an exact assessment of the working mechanism position and a trench profile is necessary.Examination of a manually operated digging process shows that an operator provides operations untimely, however an automated control system can solve this problem. Dynamic phenomena in the working mechanism have the greatest impact on the accuracy of the works performed.To assess the bucket digging edge position accuracy, a mathematical model of the working mechanism has been created. Based on the cycle scheme of the working process, the excessive displacements of the hydraulic cylinder rods under the load are taken into account. By the end of the cycle, the difference between the specified and obtained positions along the vertical coordinate has been 0.0892 m.A dynamic error of the hydraulic drive system of the working mechanism is considered as a sum of the error due to excessive displacements of the hydraulic cylinder rods and the error due to delay of the hydraulic drive, with the latter being calculated for the average time of delay taking into account the data available in the literature. The total error of the bucket digging edge position of the working mechanism is 0.1176 m, which is 2 times more than the value of 0.05 mConformity of all the links with specification requirements does not guarantee compliance with the required displacement accuracy of the bucket digging edge, and, thus, the soil layer to remain in the base of the trench can exceed the regulated value of 0.05 m.

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Farmer suffers fatal crushing injuries when caught between a loader's hydraulic cylinder and its body frame.

10.26616/nioshsface93mn066 ◽

1994 ◽

Keyword(s):

Hydraulic Cylinder ◽

Body Frame

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A Theoretical Model with Which to Safely Optimize the Configuration of Hydraulic Suspension of Modular Trailers in Special Road Transport

Applied Sciences ◽

10.3390/app11010305 ◽

2020 ◽

Vol 11 (1) ◽

pp. 305

Author(s):

Rubén Escribano-García ◽

Marina Corral-Bobadilla ◽

Fátima Somovilla-Gómez ◽

Rubén Lostado-Lorza ◽

Ash Ahmed

Keyword(s):

Theoretical Model ◽

Wind Turbine ◽

Optimization Algorithm ◽

Hydraulic Cylinder ◽

Road Transport ◽

Automatic Testing ◽

Transport Systems ◽

The Road ◽

Proposed Model ◽

On The Road

The dimensions and weight of machines, structures, and components that need to be transported safely by road are growing constantly. One of the safest and most widely used transport systems on the road today due to their versatility and configuration are modular trailers. These trailers have hydraulic pendulum axles that are that are attached in pairs to the rigid platform above. In turn, these modular trailers are subject to limitations on the load that each axle carries, the tipping angle, and the oil pressure of the suspension system in order to guarantee safe transport by road. Optimizing the configuration of these modular trailers accurately and safely is a complex task. Factors to be considered include the load’s characteristics, the trailer’s mechanical properties, and road route conditions including the road’s slope and camber, precipitation and direction, and force of the wind. This paper presents a theoretical model that can be used for the optimal configuration of hydraulic cylinder suspension of special transport by road using modular trailers. It considers the previously mentioned factors and guarantees the safe stability of road transport. The proposed model was validated experimentally by placing a nacelle wind turbine at different points within a modular trailer. The weight of the wind turbine was 42,500 kg and its dimensions were 5133 × 2650 × 2975 mm. Once the proposed model was validated, an optimization algorithm was employed to find the optimal center of gravity for load, number of trailers, number of axles, oil pressures, and hydraulic configuration. The optimization algorithm was based on the iterative and automatic testing of the proposed model for different positions on the trailer and different hydraulic configurations. The optimization algorithm was tested with a cylindrical tank that weighed 108,500 kg and had dimensions of 19,500 × 3200 × 2500 mm. The results showed that the proposed model and optimization algorithm could safely optimize the configuration of the hydraulic suspension of modular trailers in special road transport, increase the accuracy and reliability of the calculation of the load configuration, save time, simplify the calculation process, and be easily implemented.

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Failure Monitoring and Predictive Maintenance of Hydraulic Cylinder - State-of-the-Art Review

IEEE/ASME Transactions on Mechatronics ◽

10.1109/tmech.2021.3053173 ◽

2021 ◽

pp. 1-1 ◽

Cited By ~ 1

Author(s):

Vignesh Vishnudas Shanbhag ◽

Thomas J. J. Meyer ◽

Leo W. Caspers ◽

Rune Schlanbusch

Keyword(s):

State Of The Art ◽

Hydraulic Cylinder ◽

Predictive Maintenance ◽

Failure Monitoring

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Simulation of Hydraulic Cylinder Cushioning

Sustainability ◽

10.3390/su13020494 ◽

2021 ◽

Vol 13 (2) ◽

pp. 494

Author(s):

Antonio Algar ◽

Javier Freire ◽

Robert Castilla ◽

Esteban Codina

Keyword(s):

Dynamic Model ◽

Cfd Simulation ◽

Fluid Dynamic ◽

Computational Fluid Dynamic Simulation ◽

Hydraulic Cylinder ◽

Outlet Port ◽

Optimal Behavior ◽

Radial Movement ◽

Mechanical Shocks ◽

Radial Gap

The internal cushioning systems of hydraulic linear actuators avoid mechanical shocks at the end of their stroke. The design where the piston with perimeter grooves regulates the flow by standing in front of the outlet port has been investigated. First, a bond graph dynamic model has been developed, including the flow throughout the internal cushion design, characterized in detail by computational fluid-dynamic simulation. Following this, the radial movement of the piston and the fluid-dynamic coefficients, experimentally validated, are integrated into the dynamic model. The registered radial movement is in coherence with the significant drag force estimated in the CFD simulation, generated by the flow through the grooves, where the laminar flow regime predominates. Ultimately, the model aims to predict the behavior of the cushioning during the movement of the arm of an excavator. The analytical model developed predicts the performance of the cushioning system, in coherence with empirical results. There is an optimal behavior, highly influenced by the mechanical stress conditions of the system, subject to a compromise between an increasing section of the grooves and an optimization of the radial gap.

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Internal Leakage Detection of Hydraulic Cylinder Based on Wavelet Analysis and Backpropagation Neural Network

2020 Global Reliability and Prognostics and Health Management (PHM-Shanghai) ◽

10.1109/phm-shanghai49105.2020.9280969 ◽

2020 ◽

Author(s):

Liqin Wang ◽

Dongfeng Wang ◽

Jianjun Qi ◽

Yong Xue

Keyword(s):

Neural Network ◽

Wavelet Analysis ◽

Hydraulic Cylinder ◽

Leakage Detection ◽

Backpropagation Neural Network

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Hole Accuracy during Deep Hole Drilling for Hydraulic Cylinder Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.984-985.67 ◽

2014 ◽

Vol 984-985 ◽

pp. 67-72 ◽

Cited By ~ 1

Author(s):

R. Clifford Benjamin Raj ◽

B. Anand Ronald ◽

A. Velayudham ◽

Prasmit Kumar Nayak

Keyword(s):

Feed Rate ◽

Drill Hole ◽

Hydraulic Cylinder ◽

High Accuracy ◽

Diameter Ratio ◽

Hole Drilling ◽

Deep Hole ◽

Deep Hole Drilling ◽

Very High ◽

Continuous Chip

Deep-hole drilling is a process in which the hole length will be very high when compared to diameter of the drill hole (i.e. length to diameter ratio will be greater than 5). Drilling a deep hole with very high accuracy is difficult process. The current project is about the production of deep hole with the aim to produce a chip which is not a continuous chip and also not a powdery chip. These conditions can be attained by varying the spindle speed and the tool feed rate.

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