Development of Backdrivable Servovalve With Feedback Spring for Enhanced Electro-Hydraulic Torque Actuator

Nam, Seokho; Lee, Woongyong; Yoo, Sunkyum; Kim, Kee Hoon; Chung, Wan Kyun

doi:10.1109/lra.2020.2975728

Cited by 4 publications

(4 citation statements)

References 20 publications

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“…The hydraulic system cannot only realize the rapid transmission of power but also assist agricultural machinery to achieve various functions; it can be said that the normal operation of agricultural machinery is inseparable from the hydraulic system [7]. With the integrated development of electro-mechanical-hydraulic technology, a large number of electro-mechanical-hydraulic technologies have also been applied to agricultural machinery; in addition, many hydraulic, electrical, and mechanical devices cooperate to form a complex structure and transmission mode; therefore, during the long-term high-intensity use of agricultural machinery, various failure problems are prone to occur; the leakage of hydraulic oil is one of the most common faults [8]. In the process of using agricultural machinery, if the driver of agricultural machinery can master the failure performance and maintenance methods of hydraulic system leakage, the impact of hydraulic system failure on the use of agricultural machinery can be greatly reduced; it is beneficial to ensure the long-term, stable, and efficient operation of agricultural machinery.…”

Section: Introductionmentioning

confidence: 99%

Application of Modern Multimedia and Sensing Technology in Fault Detection and Diagnosis of Hydraulic Agricultural Machinery

Jia

Ji-jing

2022

Wireless Communications and Mobile Computing

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In order to solve the problem of fault diagnosis of agricultural machinery hydraulic system, the authors propose an application of modern multimedia and sensing technology in fault detection and diagnosis of hydraulic agricultural machinery. By analyzing the component faults and system faults of the hydraulic system of agricultural machinery, an expert system for fault diagnosis is constructed, and a knowledge base and inference engine suitable for fault diagnosis of the hydraulic system of agricultural machinery are designed. In order to further improve the diagnostic accuracy of the fault diagnosis expert system, a fault diagnosis based on sparse coding is designed, and the sparse coding fault diagnosis results are integrated with the expert system to improve the diagnostic accuracy. The experimental results show that after sparse coding fusion, the fault diagnosis accuracy can be improved to more than 91%. In conclusion, the model meets the requirements of fault diagnosis and puts forward a new idea for the fault diagnosis of agricultural machinery hydraulic system. Make the agricultural machinery and equipment industry develop healthily.

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Section: Introductionmentioning

confidence: 99%

Application of Modern Multimedia and Sensing Technology in Fault Detection and Diagnosis of Hydraulic Agricultural Machinery

Jia

Ji-jing

2022

Wireless Communications and Mobile Computing

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“…The average power loss for n p pistons in one rotation cycle (W n p L ) can be calculated by equation (23).…”

Section: Piston Dynamic Modelmentioning

confidence: 99%

“…Additionally, a torque-controlled electro-hydraulic actuator (EHTA) was developed by Seokho Nam et al 23 The proposed actuator contains a back-drivable servo valve in which it can perform flow control using a mechanical spring for feedback and pressure control using a pressure control port. After the experiment, it was observed that the effect of viscous friction increased but the static friction effect was reduced.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of an integrated electro-hydraulic actuator using dynamic modeling and optimization

Amrollah¹,

Abdellatif

Alfayad

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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For robotic applications, hydraulic actuation is still an open research issue. A hydraulic actuation solution based on integrated hydraulics is presented in the form of an integrated electro-hydraulic Actuator (IEHA). This actuator tackles some issues related to compactness and self-contained autonomous robotic systems. One of its primary uses is the actuation of the hydraulic humanoid robot HYDROïD. Primary experimental validation of the IEHA actuator has suffered from several low-performance issues. The main reason for such performance is due to that inner friction forces and leakage losses were not addressed or modeled yet. In this paper, a detailed dynamic model of the IEHA actuator is needed to identify the mechanical components that affect the volumetric and mechanical efficiencies of the actuator. The dynamic model focuses on the dynamics of essential parameters and components like the micro-pump pistons, their internal leakage, and friction during actuation. The design parameters of these mechanical parts are optimally calculated to produce a new enhanced dynamic model. The new IEHA model is verified through simulation to actuate the ankle pitch rotation of the robot. A genetic algorithm is used to optimize the geometrical and design parameters while enhancing the overall mechanical and volumetric efficiencies of the IEHA. The IEHA model was able to generate a locomotion gait cycle successfully for a walking speed of 1.17 m/s. Simulation results have shown that the design enhancements led to 95% and 97% volumetric and mechanical efficiencies respectively. Finally, the new enhanced IEHA prototype is tested experimentally. The output flow of the new prototype has improved by approximately 58%.

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“…Through understanding the key technology of jet pipe servo valves, it is found that there are many kinds of jet pipe servo valve. These mainly include rotary jet pipe servo valves, jet pipe valves, integrated jet pipe valves, slide valve end inclined jet pipe valves and middle jet pipe valves [7][8][9][10][11][12][13][14][15][16][17][18]. To verify the adaptability of jet pipe valves in aircraft braking systems, Yang [19] and Zhao [20] compared the performance indexes of nozzle flapper valves and jet pipe valves, and proposed that the key technical indexes of jet pipe valves meet the performance requirements of nozzle flapper valves.…”

Section: Introductionmentioning

confidence: 99%

Design and Verification of Two-Stage Brake Pressure Servo Valve for Aircraft Brake System

Zhang

Huang

et al. 2021

Processes

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Wheel braking devices is some of the most widely used landing deceleration devices in modern aircraft. Jet pipe pressure servo valves are widely used in large aircraft wheel brake control systems because of their high anti-pollution ability, high sensitivity and fast dynamic response. However, most brake systems suffer vibration phenomena during the braking process. The pressure servo valve is an important part of the hydraulic brake system, and also an important factor affecting the vibration of the system. In order to solve the vibration problem in the brake system this paper present a two-stage brake pressure servo valve design. We place feedback channels at both ends of the main spool to stabilize the output pressure. In addition, modeling, simulation and experimental verifications are carried out. Firstly, the principle and structure of the pressure servo valve are described. An accurate mathematical model of the two-stage brake pressure servo valve and the testing system is established. Then a simulation analysis is carried out. Finally, a two-stage brake pressure servo valve testing experimental platform system is built for experimental verification. The experimental results show that the mathematical model of the two-stage brake pressure servo valve and the test system established in this paper have high accuracy, and the designed servo valve structure can restrain vibrations. The above research results provide a useful theoretical reference for performance optimization, stability analysis and valve body structure improvement of brake pressure servo valves.

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Development of Backdrivable Servovalve With Feedback Spring for Enhanced Electro-Hydraulic Torque Actuator

Cited by 4 publications

References 20 publications

Application of Modern Multimedia and Sensing Technology in Fault Detection and Diagnosis of Hydraulic Agricultural Machinery

Application of Modern Multimedia and Sensing Technology in Fault Detection and Diagnosis of Hydraulic Agricultural Machinery

Performance enhancement of an integrated electro-hydraulic actuator using dynamic modeling and optimization

Design and Verification of Two-Stage Brake Pressure Servo Valve for Aircraft Brake System

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