Investigation Into the Adjustable Dynamic Characteristic of the High-Speed / Valve With an Advanced Pulsewidth Modulation Control Algorithm

Zhong, Qi; Wang, Xiele; Zhou, Hongzhao; Xie, Geng; Hong, Haocen; Li, Yanbiao; Chen, Bin; Yang, Huayong

doi:10.1109/tmech.2021.3131095

Cited by 29 publications

(11 citation statements)

References 27 publications

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“…In addition, the opening delay time t don and the opening movement time t mon can be reduced by using the high driving voltage, and the closing delay time t doff and the closing movement time t moff are all reduced by using the negative voltage. Therefore, the following adaptive PWM control signal (Figure 3a) [24] is often used to drive the HSV because of the several benefits, such as high dynamic performance and low power loss [25]. Figure 3b shows comparisons of the static flow rate between the simulations and experiments when HSV is driven by an adaptive PWM signal.…”

Section: Hsv Performancementioning

confidence: 99%

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Gao

2022

Machines

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A hydraulic pressure servo system based on two high-speed on/off valves (HSV) is a discontinuous system due to the discrete flow of HSV when driven by pulse width modulation (PWM) signal. Pressure variation in the testing chamber is determined by the flow rate difference between the charging and discharging HSV. In this paper, a pressure controller consisting of a differential PWM (DPWM) scheme, asymmetric pressure difference compensation (APDC) and nonlinear adaptive control (NAC) is proposed to precisely control the pressure. The DPWM scheme is designed to improve the resolution of the net flow rate into the testing chamber. Furthermore, due to the strong asymmetry between the charging and the discharging process, the APDC method is proposed to design the two initial duty cycles of the DPWM signal which help to balance its charging and discharging ability under different working pressure points. Since the pressure system is a nonlinear, uncertain system due to oil compression and leakage, the NAC is designed to calculate the control duty cycle of the DPWM signal, which is used to overcome the unmodeled dynamic and parameter uncertainties. Comparative experiments indicate that the proposed controller can ensure good pressure tracking performance and enhance system robustness under different working pressure points and tracking frequencies.

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Section: Hsv Performancementioning

confidence: 99%

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Gao

2022

Machines

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“…Based on Kirchhoff’s law of voltage, the balanced equation of coil voltage is as follows 22 where U and I are the driving voltage and coil current, respectively, and L and R are the inductance and resistance, respectively.…”

Section: Mathematical Model Of Fsvmentioning

confidence: 99%

Investigation on the transient impact characteristics of fast switching valve during excitation stage

Gao

2022

Journal of Low Frequency Noise, Vibration and Active Control

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Fast switching valve (FSV) inevitably experiences high-speed impact while obtaining high dynamics, which affects its control accuracy and service life. In this article, the impact characteristics of the FSV during the excitation stage are investigated. Firstly, a nonlinear mathematical model considering the magnetic saturation is established and verified. Then, the influences of three types of driving voltages on the initial impact velocity and the opening time of the FSV are analyzed, which proves that only the driving voltage featured by an interval of negative voltage (−24V) can obtain a good balance between the initial impact velocity and opening time. In addition, finite element simulations of transient impact characteristics show that smaller initial impact velocity is beneficial to reduce the impact displacement, equivalent stress, and wear volume. The influences of impact times on the flow area of the valve seat are quantitatively analyzed under different impact velocities. Theoretical results indicate that, compared to the high driving voltage, the variation of flow area per million impacts is reduced by 27.3% under the presented driving voltage. Finally, experimental results demonstrate that with the presented driving voltage, the average acceleration and the average noise are reduced by 65.7% and 12%, respectively. And the acceleration frequency spectrum and the modal simulation both reveal the composition of impact noise, in which the noise heard by the human ear is mainly impacted noise, not the ringing noise.

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“…Hydraulic systems have wide applications in many fields, such as construction, 1,2 aerospace, 3 robotics 4,5 and agriculture 6 to transmit fluid power due to their attributes of high power density and convenient pressure and flow control. The working fluid of hydraulic systems is usually supplied by an axial piston pump that converts mechanical energy into hydraulic one.…”

Section: Introductionmentioning

confidence: 99%

New analytical leakage models for tribological interfaces in axial piston pumps

Chao

Shao

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Axial piston pumps act as the power source in hydraulic systems and their volumetric losses mainly arise from leakage of tribological interfaces. The leakage of tribological interfaces was often modeled as a simple mixture of pressure-induced flow and velocity-induced flow in previous studies. However, few studies have clarified the contribution of discharge pressure and rotational speed to the leakage flow. This work considers both pressure and velocity factors and establishes new analytical models for the leakage of tribological interfaces from Navier-Stokes equations. Experiments were performed on an actual axial piston pump to measure its leakage flow rates at different discharge pressures and rotational speeds. Results show that the total pump leakage excludes Couette flow and only includes Poiseuille and centrifugal flows. The Poiseuille flow predominates the pump leakage while the centrifugal flow contributes little to the pump leakage.

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Investigation Into the Adjustable Dynamic Characteristic of the High-Speed / Valve With an Advanced Pulsewidth Modulation Control Algorithm

Cited by 29 publications

References 27 publications

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Nonlinear Adaptive Control with Asymmetric Pressure Difference Compensation of a Hydraulic Pressure Servo System Using Two High Speed On/Off Valves

Investigation on the transient impact characteristics of fast switching valve during excitation stage

New analytical leakage models for tribological interfaces in axial piston pumps

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