Study on nonlinear dynamic behavior and stability of aviation pressure servo valve-controlled cylinder system

Song, Yan-he; Ba, Kaixian; Wang, Yuan; Zhang, Jun-Xiao; Yu, Bin; Zhang, Qiwei; Kong, Xianwen

doi:10.1007/s11071-022-07366-x

Cited by 12 publications

(4 citation statements)

References 24 publications

(15 reference statements)

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“…Increasing the pressure level can reduce the effective area of the cylinder A p under the same load force requirement. According to Equation (18), when A p is reduced, m t and V t are also reduced. When the cylinder stroke is the same, the reduction ratio of m t and V t is consistent with that of A p , then the natural frequency ω h = 4β e A 2 p m t V t remains unchanged.…”

Section: C) Environmental Conditionsmentioning

confidence: 99%

Quantitative Comparative Study on the Performance of a Valve-Controlled Actuator and Electro-Hydrostatic Actuator

Yang,

Lu,

Jiang

et al. 2024

Actuators

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The development of the electrification of aircraft has prompted aviation hydraulic systems to shift from traditional centralized valve actuators (CVAs) to electro-hydrostatic actuators (EHAs). In this paper, aiming at the demand for a quantitative comparison of performance between CVAs and EHAs, CVA and EHA prototypes with the same power level and test platform were developed. Then, based on the power flow and dynamic models of the CVA and EHA, simulation and experimental comparative tests were conducted using different load spectrum test conditions and step response test conditions. The comparative test results showed that the efficiency of the EHA was better than that of the CVA, and the dynamic response of the CVA was better than that of the EHA. Finally, a power loss quantification and parameter sensitivity analysis were performed to reveal the impact of different parameters on the different power losses and to provide suggestions for improving the performance of CVAs and EHAs.

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Section: C) Environmental Conditionsmentioning

confidence: 99%

Quantitative Comparative Study on the Performance of a Valve-Controlled Actuator and Electro-Hydrostatic Actuator

Yang,

Lu,

Jiang

et al. 2024

Actuators

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“…Currently, a highly integrated electro-hydraulic servo system is primarily adopted in the leg joint drivers of advanced hydraulic-driven legged robots. The typically used electro-hydraulic servo system is available two forms: the valve-controlled cylinder system [6][7][8] and pump-controlled cylinder system [9,10]. The valve-controlled cylinder system is controlled using an electro-hydraulic servo valve.…”

Section: Introductionmentioning

confidence: 99%

Force Compensation Control for Electro-Hydraulic Servo System with Pump–Valve Compound Drive via QFT–DTOC

Ba,

Wang,

et al. 2024

Chin. J. Mech. Eng.

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Each joint of a hydraulic-driven legged robot adopts a highly integrated hydraulic drive unit (HDU), which features a high power–weight ratio. However, most HDUs are throttling-valve-controlled cylinder systems, which exhibit high energy losses. By contrast, pump control systems offer a high efficiency. Nevertheless, their response ability is unsatisfactory. To fully utilize the advantages of pump and valve control systems, in this study, a new type of pump–valve compound drive system (PCDS) is designed, which can not only effectively reduce the energy loss, but can also ensure the response speed and response accuracy of the HDUs in robot joints to satisfy the performance requirements of robots. Herein, considering the force control requirements of energy conservation, high precision, and fast response of the robot joint HDU, a nonlinear mathematical model of the PCDS force control system is first introduced. In addition, pressure–flow nonlinearity, friction nonlinearity, load complexity and variability, and other factors affecting the system are considered, and a novel force control method based on quantitative feedback theory (QFT) and a disturbance torque observer (DTO) is designed, which is denoted as QFT–DTOC herein. This method improves the control accuracy and robustness of the force control system, reduces the effect of the disturbance torque on the control performance of the servo motor, and improves the overall force control performance of the system. Finally, experimental verification is performed using the PCDS performance test platform. The experimental results and quantitative data show that the QFT–DTOC proposed herein can significantly improve the force control performance of the PCDS. The relevant force control method can be used as a bottom-control method for the hydraulic servo system to provide a foundation for implementing the top-level trajectory planning of the robot.

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“…Junting Lu et al introduced an additional variable to represent the nonlinearity of the system in the frequency characteristic model of the hydraulic system and proposed a variable parameter feedforward control method with better phase characteristics and higher tracking accuracy [22]. Yanhe Song et al studied the nonlinear dynamic behavior of a pressure servo valve-controlled cylinder system (PSVCS) and obtained the influence of key parameters on nonlinear self-excited behavior [23]. Qixin Zhu designed a compound control method combining sliding mode control (SMC) and model-based linear extended state observer (MLESO).…”

Section: Introductionmentioning

confidence: 99%

A Novel Double Closed Loop Control of Temperature and Rotational Speed for Integrated Multi-Parameter Hydro-Viscous Speed Control System (HSCS)

Zhao,

Wang,

Wang

et al. 2024

Machines

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Hydro-viscous clutch has already become an inevitable choice for special vehicle transmission in the present and future. As a nonlinear system with a large hysteresis loop, its speed control performance is affected by input rotational speed, lubricating oil temperature, lubrication pressure, and other factors. The traditional control method cannot adjust the temperature and rotational speed, which will lead to problems of narrow speed range, poor rotational speed stability, and large dynamic load impact. In order to solve the above problems, this paper studies the control method of an integrated multi-parameter hydro-viscous speed control system (HSCS) in a controlled environment. Through the mechanism analysis of the law of HSCS, the influence law of speed and temperature during the system operation is found. The temperature closed loop based on model predictive control (MPC) is introduced to control the rotational speed, and then the traditional PID control results are compensated according to the speed closed loop. Next, a novel double closed loop control method of temperature and rotational speed for HSCS is formed. Finally, the simulating verification is carried out. Compared with the traditional control method, the design method in this paper can adjust the control parameters according to the temperature of the lubricating oil and the input rotational speed and effectively expand the domain of HSCS and the speed control stability. The effective transmission ratio is extended to 0.2~0.8, and the hydro-viscous torque and speed fluctuation under the engine rotational speed fluctuation are reduced by more than 30%. The novel control method of HSCS designed in this paper can effectively improve the influence of input rotational speed and lubricating oil temperature on the speed control performance of HSCS and can be widely used in nonlinear HSCS such as hydro-viscous clutch.

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Study on nonlinear dynamic behavior and stability of aviation pressure servo valve-controlled cylinder system

Cited by 12 publications

References 24 publications

Quantitative Comparative Study on the Performance of a Valve-Controlled Actuator and Electro-Hydrostatic Actuator

Quantitative Comparative Study on the Performance of a Valve-Controlled Actuator and Electro-Hydrostatic Actuator

Force Compensation Control for Electro-Hydraulic Servo System with Pump–Valve Compound Drive via QFT–DTOC

A Novel Double Closed Loop Control of Temperature and Rotational Speed for Integrated Multi-Parameter Hydro-Viscous Speed Control System (HSCS)

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