Frequency domain modeling, analysis and verification of electro-hydraulic servo steering system for heavy vehicles

Zhang, Zhizhong; Du, Haibo; Chen, Shumei; Huang, Hui

doi:10.1177/0954407020918696

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Electrohydraulic servo steering system (EHSSS) is a key technology to ensure the flexibility and safety of heavy vehicles, and it has studied by many scholars. [1][2][3][4] Due to environmental and economic issues, 5 the high-efficiency and energy-saving EHSSS has become an urgent need for heavy vehicles. However, the traditional EHSSS is usually controlled by a traditional valve with one single control signal.…”

Section: Introductionmentioning

confidence: 99%

Application research of electro-hydraulic servo steering system based on independent metering system

Liu

Cai

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Electro-hydraulic servo steering system (EHSSS) is a key technology for heavy vehicles. The traditional EHSSS has high control accuracy but low energy efficiency. Therefore, this paper proposes a novel EHSSS based on independent metering system, which can combine high steering accuracy with high energy efficiency. Firstly, two servo-proportional valves are used to reduce the throttling loss at the meter-out orifice. The servo motor pump is used to keep the pump supply pressure at a low value. Then, to ensure high steering accuracy, a position-velocity-pressure combined control strategy is proposed for easy engineering practice. And a smooth switching strategy is proposed to achieve smooth mode switching at high frequency. Finally, the effectiveness of the proposed method is verified by experiments. The experimental comparison results show that the proposed method can achieve the same accuracy as the valve-controlled steering system with less energy, and can realize smooth mode switching.

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Section: Introductionmentioning

confidence: 99%

Application research of electro-hydraulic servo steering system based on independent metering system

Liu

Cai

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

View full text Add to dashboard Cite

show abstract

“…To verify the adaptability of jet pipe valves in aircraft braking systems, Yang [19] and Zhao [20] compared the performance indexes of nozzle flapper valves and jet pipe valves, and proposed that the key technical indexes of jet pipe valves meet the performance requirements of nozzle flapper valves. Zhang [21] provided an experimental method for the stability assessment of jet pipe valves with experimental projects as the background. In order to study the influence of main structural parameters on the performance of jet pipe valves Yi [22] built a jet pipe valve simulation platform with the AMESim software, and analyzed the influence of the main structural parameters on the characteristics of jet pipe valves, which provided a theoretical basis for the design of the valves.…”

Section: Introductionmentioning

confidence: 99%

Design and Verification of Two-Stage Brake Pressure Servo Valve for Aircraft Brake System

Zhang

Huang

et al. 2021

Processes

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Wheel braking devices is some of the most widely used landing deceleration devices in modern aircraft. Jet pipe pressure servo valves are widely used in large aircraft wheel brake control systems because of their high anti-pollution ability, high sensitivity and fast dynamic response. However, most brake systems suffer vibration phenomena during the braking process. The pressure servo valve is an important part of the hydraulic brake system, and also an important factor affecting the vibration of the system. In order to solve the vibration problem in the brake system this paper present a two-stage brake pressure servo valve design. We place feedback channels at both ends of the main spool to stabilize the output pressure. In addition, modeling, simulation and experimental verifications are carried out. Firstly, the principle and structure of the pressure servo valve are described. An accurate mathematical model of the two-stage brake pressure servo valve and the testing system is established. Then a simulation analysis is carried out. Finally, a two-stage brake pressure servo valve testing experimental platform system is built for experimental verification. The experimental results show that the mathematical model of the two-stage brake pressure servo valve and the test system established in this paper have high accuracy, and the designed servo valve structure can restrain vibrations. The above research results provide a useful theoretical reference for performance optimization, stability analysis and valve body structure improvement of brake pressure servo valves.

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“…Jing et al 13 simulated the internal excitation of meshing gears at all levels of wind turbine gearbox, solved the vibration response of the system by modal superposition method, which proved that the calculation results are basically consistent with the test results. Zhang et al 14 studied the frequency response characteristics of electro-hydraulic servo steering system on vehicle, considered the difficulty to directly establish the frequency domain model, a linearization analysis method was proposed and the correctness of the linear frequency domain model was verified. Liu et al 15 proposed a method to reduce the reliability of uniaxial acceleration spectrum and shorten the test time by Fourier transform, the time-domain and frequency-domain information of the signal were obtained by short-time Fourier transform, and the relative fatigue damage was taken as the qualification criterion.…”

Section: Introductionmentioning

confidence: 99%

Study on vibration characteristics of hydraulic planetary transmission considering engine and torque converter excitation

Wen

Ren

Lin

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Large-size vehicle loaders are mainly used in various construction projects with complex working environment, which has a serious impact on the internal vibration of the whole system. In this study, the vibration characteristics of hydraulic planetary transmission of vehicle loader considering the influence of the external excitation are evaluated theoretically and experimentally. The output torque of the four-stroke six-cylinder diesel engine is obtained by force calculation of crank and connecting rod mechanism. The equivalent stiffness and damping of the torque converter are solved according to the torsional dynamic equation of the torque converter. The trapped oil area, oil pressure, and flow rate of gear meshing part are extracted to obtain the trapped oil pressure of variable-speed pump. Then, the multi-degree-of-freedom gear system dynamic model is established to calculate the meshing force, which is applied to vibration response analysis model by using mode superposition method. Lastly, the vibration response test is performed on the experimental prototype to verify the calculation method. The conclusion shows that the generation principle of external excitation and its calculation method in this paper are feasible in the analysis of dynamic characteristics of hydraulic planetary torque converter.

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Frequency domain modeling, analysis and verification of electro-hydraulic servo steering system for heavy vehicles

Cited by 6 publications

References 19 publications

Application research of electro-hydraulic servo steering system based on independent metering system

Application research of electro-hydraulic servo steering system based on independent metering system

Design and Verification of Two-Stage Brake Pressure Servo Valve for Aircraft Brake System

Study on vibration characteristics of hydraulic planetary transmission considering engine and torque converter excitation

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