Conceptual Design and Composition Principles Analysis of a Novel Collaborative Rectification Structure Pump

Zimeng

2020

Sensors

Self Cite

In order to provide a simplified and low-cost solution of the terminal for a distributed actuation system, this paper proposes an electro-hydrostatic actuator (EHA) based on the linear drive principle. The proposed actuator is directly driven by a linear pump with a collaborative rectification mechanism, whose performance relies on the collaboration of the internal two units. A pair of linear oscillating motors are employed to drive the two pump units respectively. The control of the actuator is based on the modulation of the oscillating amplitude, frequency, and phase difference of the two motors. The advantage of this actuator is that no more valve control is needed to rectify the linear pump besides the high efficiency of the direct pump drive. In this paper, both schematic and detailed structure of the actuator is presented. The kinematic and dynamic characteristics are analyzed and modeled, based on which the control method is proposed. The experiments verify the validity of the actuator structure and control.

Section: Principle Of the Pump Flowrate Variationmentioning

confidence: 99%

“…We define the displacement of the pump as the flow volume in one motion cycle of the two movers. According to Li and co-workers [21], the defined displacement of the pump is…”

Section: Principle Of the Pump Flowrate Variationmentioning

confidence: 99%

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Design, Analysis, and Verification of an Electro- Hydrostatic Actuator for Distributed Actuation System

Zimeng

2020

Sensors

Self Cite

“…The oscillation reached ±5 mm stroke and 30 Hz frequency. The thrust force reached 500 N. Based on the linear oscillating motor, Li et al [6] developed the linear drive collaborative rectification structure pump (LDP). Jiao et al [7] invented the linear drive electro-hydrostatic actuator and experiments were conducted.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Repetitive Control of A Linear Oscillating Motor under Periodic Hydraulic Step Load

et al. 2020

Sensors

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A linear oscillating motor has a direct and efficient linear motion output and is widely used in linear actuation systems. The motor is often applied to compact hybrid electrohydraulic actuators to drive a linear pump. However, the periodic switch of the rectification valve in the pump brings the hydraulic step load to the linear motor, which causes periodic oscillation waveform distortions. The distortion results in the reduction of pumping capacity. The conventional feedback proportional-integral-derivative control is applied to the pump, however, this solution cannot handle the step load as well as resolving nonlinear properties and uncertainties. In this paper, we introduce a nonlinear model to identify periodic hydraulic load. Then, the loads are broken up into a set of simple terms by Fourier series approximation. The uncertain terms and other modeling uncertainties are estimated and compensated by the practical adaptive controller. A robust control term is also developed to handle uncertain nonlinearities. The controller overcame drawbacks of conventional repetitive controllers, such as heavy memory requirements and noise sensitivity. The controller can achieve a prescribed final tracking accuracy under periodic hydraulic load via Lyapunov analysis. Finally, experimental results on the linear oscillating motor-pump are provided for validation of the effectiveness of the scheme.

“…Due to high output power and efficiency of linear motors, electromagnetic actuation linear pump concept has been proposed in our previous works to overcome the drawbacks brought by rotary EHA. 10,11 Its major advantages include (1) low heat loss and noise due to absence of severe friction pairs; (2) improved dynamic performance because of low mover inertia; (3) high reliability due to redundancy configuration availability.…”

Section: Introductionmentioning

confidence: 99%

Efficiency analysis of moving-magnet linear oscillating motor with dual-resonance for linear electro-hydrostatic actuator

Wang

Proceedings of the Institution of Mechanical Engineers, Part G:

Yan

2016

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More-electric aircraft draws considerable attention due to its high efficiency, high reliability, and easy maintenance. Linear electro-hydrostatic actuator is a novel linear actuation system suitable for more-electric aircraft, and offers many advantages over traditional rotary electro-hydrostatic actuator. However, it requires high-frequency reciprocate actuation of linear oscillating motors with both high efficiency and high power factor. In this study, a novel moving-magnet tubular linear oscillating motor with dual-resonance is proposed for linear electro-hydrostatic actuator applications to achieve high efficiency and high power factor simultaneously. Firstly, system impedance model is set up analytically, which helps to analyze the influence of structure parameters on system performance. Based on this model, working efficiency and power factor are compared with the nonresonance design, and validated by experimental results. In order to take real scenario into considerations, the nonlinearity of motor and rectangular-type load is also analytically derived and analyzed with effective resonant frequency tracking method proposed. It shows that dual-resonance design does increase system efficiency and power factor, and can be applied in linear electro-hydrostatic actuator system for more-electric aircraft effectively.