Modeling and Parameter Identification of the Vibration Characteristics of Armature Assembly in a Torque Motor of Hydraulic Servo Valves under Electromagnetic Excitations

Peng, Jinghui; Li, Songjing; Yang, Fan

doi:10.1155/2014/247384

Cited by 13 publications

(10 citation statements)

References 25 publications

(24 reference statements)

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“…Integrating each of the component transfer functions (8), (10), (12), and (13), we can acquire the transfer function structure diagram of the whole hydraulic flexible towing speed control system which is shown; the transfer function diagram of the underwater vehicle speed control system may be obtained in Figure 4.…”

Section: Modeling Of the Underwater Vehicle Speed Control Systemmentioning

confidence: 99%

“…In modern times, many scholars have done plenty of research work on the modeling of hydraulic and fluid systems with rope actuation [5,6] and proposed a good deal of advanced control technology such as feedback, neural network, adaptive robust control, and predictive control [7][8][9][10][11]. In order to predict the vibration characteristics of the armature assembly, Peng et al focused on the mathematical modeling of the vibration characteristics of armature assembly in a hydraulic servo valve and the identification of parameters in the models [12]. Chen et al developed the dynamic model of the valve-controlled hydraulic winch by linearizing its nonlinear dynamics at an operating point and found that the FUZZY P + ID controller is much more robust than the conventional PID controller [13].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Speed Control of the Underwater Wheeled Vehicle Flexible Towing System

Liu

Wang

et al. 2019

Mathematical Problems in Engineering

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In this paper, the research contents are mainly focused on the technology of the underwater wheeled vehicle speed control. For providing a passive towed underwater wheeled vehicle with accelerating, uniform motion and decelerating capability which can simulate an underwater navigation environment for the carried unit, we devised a novel open-type hydraulic flexible towing system. Combining the hydrodynamic model of the vehicle and the hydraulic mechanism model, the dynamic characteristics of the novel towing system are studied by computing simulation. Aiming at the force coupling character of double driving hydraulic winches, a master-slave synchronization control strategy is proposed. Then, in view of the flexible towing system features, i.e., strong coupling, nonlinear, time-varying load, and environmental constraints, a real speed controller based on fast terminal sliding mode control theory is designed and manufactured. To verify the effectiveness of the controller, a hardware-in-the-loop simulation test is carried out on the strength of a semiphysical simulation platform based on Matlab/Simulink and VxWorks real-time system. The experiment results show that the speed controller based on fast terminal sliding mode control has excellent effect on rapidity, stability, and anti-interference characteristics.

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Section: Modeling Of the Underwater Vehicle Speed Control Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Speed Control of the Underwater Wheeled Vehicle Flexible Towing System

Liu

Wang

et al. 2019

Mathematical Problems in Engineering

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“…Kawashima et al [15] analyzed how using a slit structure instead of an orifice plate could reduce the pressure fluctuation by 75% and the noise level approximately by 15 dB in the flapper-nozzle type servo-valve. Peng et al [4,16] also studied how the pressure pulsations could induce resonance excitation in the flapper-nozzle valve. They indicated that self-excited oscillation of the flapper-armature generated by the fluid-structure interaction can cause the self-excited noise and squeal noise.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Chen

Xiang

et al. 2018

Energies

Self Cite

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Squeal noise often occurs in a two-stage electrohydraulic servo-valve, which is an unfavorable issue of modern hydraulic energy systems. The root causes of such noise from the servo-valve are still unclear. The objective of this paper is to explore the noise mechanism in a servo-valve excited by the pressure pulsations from the hydraulic energy system perspective. The suppressing capability of squeal noise energy is investigated by changing the pressure pulsation frequency and natural frequency of the flapper-armature assembly. The frequencies of the pressure pulsations are adjusted by setting different speeds of the hydraulic pump varying from 10,400-14,400 rpm, and two flapper-armature assemblies with different armature lengths are used in the tested hydraulic energy system. The first eight vibration mode shapes and natural frequencies of the flapper-armature assembly are obtained by numerical modal analysis using two different armature lengths. The characteristics of pressure pulsations at the pump outlet and in the chamber of the flapper-nozzle valve, armature vibration and noise are tested and compared with the natural frequencies of the flapper-armature assembly. The results reveal that the flapper-armature assembly vibrates and makes the noise with the same frequencies as the pressure pulsations inside the hydraulic energy system. Resonance appears when the frequency of the pressure pulsations coincides with the natural frequency of the flapper-armature assembly. Therefore, it can be concluded that the pressure pulsation energy from the power supply may excite the vibration of the flapper-armature assembly, which may consequently cause the squeal noise inside the servo-valve. It is verified by the numerical simulations and experiments that setting the pressure pulsation frequencies different from the natural frequencies of the flapper-armature assembly can suppress the resonance and squeal noise.

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“…The results show the large magnitude of vibration for a low damping ratio of that frequency. 20 Somashekhar et al 21 developed a mathematical model of a jetpipe servovalve with a built-in mechanical feedback. The FEM approach was employed to determine the stiffness of the critical components of the feedback spring and jetpipe assembly.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the critical parameters affecting the working design dynamics of a torque motor employed in an electro-hydraulic servovalve

Sharan

Hiremath²,

Venkatesha

et al. 2018

SIMULATION

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The torque motor is an intricate assembly in electro-hydraulic technology and plays a crucial role in converting the electrical signal into controlled mechanical output signal. It involves many precise components, such as the feedback spring, armature and its coil, permanent magnet, feed pipe, flexure shaft, jetpipe, and flexure support. The components are embedded together as a single operating component. Each component contributes to the effective dynamics of the system. The present paper proposes a novel approach to investigate the effect of critical parameters on the working design dynamics of the torque motor employed in the jetpipe electro-hydraulic servovalve. Based on the principles of mechatronics, a mathematical model is developed. The model-based design approach is employed to investigate the dynamics of the system. The required simulation parameters of the critical and precision components were obtained from solid and finite element (FE) models. The solid and FE models of the critical and precision components were first analyzed with suitable boundary and loading conditions to establish the stiffness. To validate the obtained FE results, experiments were carried out with a specially designed and fabricated test setup. Based on the basic principle of electromagnetics, a nonlinear FE model of torque motor is analyzed for magnetic field distribution, the torque developed, and armature and jetpipe deflection for varied input current. From the results obtained, good agreement was observed between FE, simulated, and experimental values. The present novel approach enables one to improve the working design dynamics of the torque motor.

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Modeling and Parameter Identification of the Vibration Characteristics of Armature Assembly in a Torque Motor of Hydraulic Servo Valves under Electromagnetic Excitations

Cited by 13 publications

References 25 publications

Modeling and Speed Control of the Underwater Wheeled Vehicle Flexible Towing System

Modeling and Speed Control of the Underwater Wheeled Vehicle Flexible Towing System

Suppression of Squeal Noise Excited by the Pressure Pulsation from the Flapper-Nozzle Valve inside a Hydraulic Energy System

Investigation on the critical parameters affecting the working design dynamics of a torque motor employed in an electro-hydraulic servovalve

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