A New Electric Hydraulic Actuator Adopted the Variable Displacement Pump

Shen, Wei; Yunfei, Mai; Su, Xiaoyu; Zhao, Jinbao; Jiang, Jihai

doi:10.1002/asjc.1200

Cited by 35 publications

(18 citation statements)

References 21 publications

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“…For its poor dynamic characteristics, the structure and control strategy of direct drive system are widely studied. Shen et al [10] enhanced the dynamic response of a new type electro-hydraulic actuator adopted variable displacement pump with a fuzzy controller. Sliding mode controller was also applied to direct drive system [11][12][13], especially, the real-time values of the rod velocity and acceleration obtained from the measurement signal of displacement were applied with the discrete variable structure control algorithm, by using a third-order integral chain differentiator [14].…”

Section: Introductionmentioning

confidence: 99%

PD Plus Dynamic Pressure Feedback Control for a Direct Drive Stewart Manipulator

Zhang

2020

Energies

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In order to ensure good dynamic characteristics, servo valve is usually adopted as the drive part of Stewart manipulator which causes huge power consumption, while direct drive electro-hydraulic servo system has the advantages of energy saving, simple structure, convenient installation, and low failure rate. But its dynamic characteristics are so poor that it can only be applied to occasions where quick response is not needed. On the consideration above, following works are done in this paper. Since current coupling exists in the control system based on the speed of the servo motor as the control input, the control system of the direct drive Stewart manipulator is established based on the current of the servo motor as the control input in which the current coupling can be solved. In order to improve the dynamic characteristics of the direct drive Stewart manipulator, a Proportion Differentiation (PD) plus dynamic pressure feedback control strategy is also put forward in this paper, which is verified by using a simulated hydraulically driven Stewart manipulator. Simulation results show that both dynamic coupling and current coupling are solved and the control strategy proposed in this paper can significantly increase the bandwidths of all degrees of freedom.

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Section: Introductionmentioning

confidence: 99%

PD Plus Dynamic Pressure Feedback Control for a Direct Drive Stewart Manipulator

Zhang

2020

Energies

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“…Active suspension can solve the problem of driving comfort and control stability under different working conditions that cannot be solved by traditional passive suspension. In recent years, some new control strategies have been put forward , so research into the active suspension system combining with new control strategies has become a hot topic in recent years .…”

Section: Introductionmentioning

confidence: 99%

Fuzzy Sliding Mode Control for Active Suspension System with Proportional Differential Sliding Mode Observer

Lin

2018

Asian Journal of Control

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In this paper, a generalized augmented transformation is considered for the quarter active suspension system with uncertainties. Specifically, the model uncertainties are converted to the augmented states and a new proportion differential sliding mode observer is used to estimate state variables and model uncertainties. A differential geometric method is applied to linearize the nonlinear suspension model. In order to weaken the vibration effect of sliding mode control force and reduce energy consumption, a fuzzy sliding mode controller is designed for the active suspension system and the fuzzy controller is applied to adjust switching control gain according to the reaching condition of sliding mode surface. The simulations are conducted to illustrate the effectiveness and advantages of this proposed observer and control strategy.

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“…Hydraulic systems have been widely used in industry because of their high power density. However, due to the low efficiency of traditional hydraulic systems, many new hydraulic energy saving technologies have been developed . A hydraulic transformer is a hydraulic component that converts the input hydraulic energy at a given pressure into output hydraulic energy at another pressure without any throttle loss, which is a key component in building a CPR (common pressure rail) system .…”

Section: Introductionmentioning

confidence: 99%

Robust Backstepping Sliding Mode Controller Investigation for a Port Plate Position Servo System Based on an Extended States Observer

Shen

Huang

Wang

2018

Asian Journal of Control

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For reducing throttling loss in a pilot oil pipe in a hydraulic system based on common pressure rail, this paper proposes a solution that increases efficiency by reducing the relieving pressure. In order to compensate for the resulting control performance degradation, the paper takes a valve controlled swing motor system under low pressure as the research aim. Considering the uncertainty of external disturbance and flow parameters, the mathematical model of the system is established, using an extended state observer to estimate the external disturbances in real time to increase the compensation value and state feedback for the robust backstepping sliding mode controller. Finally, the simulation results confirm the control algorithm proposed is effective for keeping control performance in decreasing pressure conditions.

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A New Electric Hydraulic Actuator Adopted the Variable Displacement Pump

Cited by 35 publications

References 21 publications

PD Plus Dynamic Pressure Feedback Control for a Direct Drive Stewart Manipulator

PD Plus Dynamic Pressure Feedback Control for a Direct Drive Stewart Manipulator

Fuzzy Sliding Mode Control for Active Suspension System with Proportional Differential Sliding Mode Observer

Robust Backstepping Sliding Mode Controller Investigation for a Port Plate Position Servo System Based on an Extended States Observer

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