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学者姓名：张志忠
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Abstract ：
Low-frequency response, strong nonlinearity and unknown disturbances are the main challenges faced by the engineering application of the pump-controlled electro-hydraulic steering systems (EHSSs) for heavy vehicles. To solve the above problems, an active disturbance suppression controller is proposed based on a variable rate reaching law (VRRL) and a terminal sliding mode observer (TSMO) in the framework of the sliding mode control. This controller is unique because, the VRRL introduces a nonlinear activation function, which enables smooth switching between multiple reaching rates, effectively improving the response speed and the disturbance rejection performance of the pump-controlled EHSS. Furthermore, an adaptive incomplete disturbance compensation control strategy is proposed by incorporating a TSMO to further improve the accuracy and robustness of the steering system, which employs a VRRL-based TSMO to realize accurate estimation of the lumped disturbance in finite time, and avoids controller overcompensation by selecting a preferred disturbance compensation coefficient. The stability analysis demonstrates that the proposed controller effectively suppresses the lumped disturbance and reduces the convergence domain of the steering system. A pump-controlled EHSS experimental bench is constructed, and a series of experiments are conducted with various steering frequencies and load conditions, which validate the ability of the proposed controller to achieve highprecision dynamic steering in all-terrain conditions of the pump-controlled EHSS for heavy vehicles.
Keyword ：
Heavy vehicles Heavy vehicles Pump-controlled electro-hydraulic steering Pump-controlled electro-hydraulic steering Sliding mode control Sliding mode control system system Terminal sliding mode observer Terminal sliding mode observer Variable rate reaching law Variable rate reaching law
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| GB/T 7714 | Li, Su , Zhang, Zhizhong , Ding, Kaiyi et al. High-dynamic steering control of the pump-controlled electro-hydraulic steering system for heavy vehicles with active disturbance suppression [J]. | JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS , 2024 , 361 (15) . |
| MLA | Li, Su et al. "High-dynamic steering control of the pump-controlled electro-hydraulic steering system for heavy vehicles with active disturbance suppression" . | JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS 361 . 15 (2024) . |
| APA | Li, Su , Zhang, Zhizhong , Ding, Kaiyi , Guo, Kun , Zhao, Jingyi , Du, Heng . High-dynamic steering control of the pump-controlled electro-hydraulic steering system for heavy vehicles with active disturbance suppression . | JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS , 2024 , 361 (15) . |
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The internal noise sources of the bent-axis piston motor are close in distance. For example, the distance between the inlet and outlet of the motor valve plate is 38 mm, and the noise sources have the same frequency and multiple frequency phenomenon. The dense and complex noise sources in the bent-axis motor cause difficulties for the spectrum analysis method to accurately identify the same frequency and multiple frequency signals. The maximum resolution of traditional sound intensity measurement is 50 mm, which cannot meet the requirement of identification accuracy of motor internal noise source. Aiming at the problem that the traditional methods are difficult to identify the motor noise sources accurately, this paper proposed a sound intensity measurement method based on compressed sensing. The compressed sensing theory was applied to the high-precision reconstruction of sound intensity image to obtain the high-resolution sound intensity reconstruction image of the motor. Firstly, the noise radiation simulation of the bent-axis motor was carried out to obtain the characteristics of its external surface sound field. Then, based on the sound intensity image for the motor, a compressed sensing frame applied to the motor sound field was designed to obtain the sound intensity cloud image of the motor with high precision. Finally, the feasibility of the compressed sensing theory to improve the identification accuracy of motor noise source was verified by comparing the traditional acoustic intensity measurement with the compressed sensing acoustic intensity measurement. The results show that the identification scale of motor noise sources are improved from 70mm to 30mm by the sound intensity measurement method based on compressed sensing, which improves the accuracy of motor noise sources identification and realizes the high precision location of motor noise sources. © 2024 South China University of Technology. All rights reserved.
Keyword ：
Acoustic field measurement Acoustic field measurement Acoustic fields Acoustic fields Acoustic intensity Acoustic intensity Acoustic intensity measurement Acoustic intensity measurement Acoustic noise Acoustic noise Compressed sensing Compressed sensing Image reconstruction Image reconstruction Spectrum analysis Spectrum analysis
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| GB/T 7714 | Chen, Shumei , Luo, Yuanming , Huang, Hui et al. Application of Compressed Sensing in Sound Intensity Imaging of Bent-Axis Motor [J]. | Journal of South China University of Technology (Natural Science) , 2024 , 52 (4) : 68-76 . |
| MLA | Chen, Shumei et al. "Application of Compressed Sensing in Sound Intensity Imaging of Bent-Axis Motor" . | Journal of South China University of Technology (Natural Science) 52 . 4 (2024) : 68-76 . |
| APA | Chen, Shumei , Luo, Yuanming , Huang, Hui , Wu, Ganyong , Huang, Qiufang , Qian, Cong et al. Application of Compressed Sensing in Sound Intensity Imaging of Bent-Axis Motor . | Journal of South China University of Technology (Natural Science) , 2024 , 52 (4) , 68-76 . |
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Abstract ：
Multi-axle heavy vehicles employ a variable-length tie rod steering system to achieve precise multi-mode steering. However, the single-axle steering system need integrate two sets of electro-hydraulic control systems (EHCSs), resulting in the energy consumption significant increase. This paper proposes a novel energy-efficient pump-valve primary-auxiliary electro-hydraulic steering system (PVPA EHSS) which compose of a pumpcontrolled dual-steering cylinders primary system and a valve-controlled variable-length tie rod cylinder auxiliary system. The proposed system utilizes a single pump to drive both the primary and auxiliary EHCSs simultaneously, enabling high-precision and high-efficiency steering with multi steering modes. Additionally, to suppress the flow disturbance of the auxiliary system branch flow on the single-pump-controlled steering primary system, the interaction between the flow of the auxiliary system and the flow of the primary system in each steering phase is studied. A pump flow feedforward-angle feedback composite control strategy incorporating branch flow prediction is proposed to mitigate the disturbance and ensure the accurate steering of left and right tires. The experimental results demonstrate that compared to the traditional variable-length tie rod steering system, the proposed system reduces energy consumption by 58.66 %, and achieves precise adaptation of the left and right tire angles in multi steering modes.
Keyword ：
Electro-hydraulic steering system Electro-hydraulic steering system High-efficiency steering High-efficiency steering Multi-axle heavy vehicles Multi-axle heavy vehicles Pump-controlled dual steering cylinders Pump-controlled dual steering cylinders Pump-valve primary-auxiliary Pump-valve primary-auxiliary Valve-controlled tie rod cylinder Valve-controlled tie rod cylinder
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| GB/T 7714 | Li, Su , Zhang, Zhizhong , Du, Heng et al. Design and verification of a novel energy-efficient pump-valve primary-auxiliary electro-hydraulic steering system for multi-axle heavy vehicles [J]. | ENERGY , 2024 , 312 . |
| MLA | Li, Su et al. "Design and verification of a novel energy-efficient pump-valve primary-auxiliary electro-hydraulic steering system for multi-axle heavy vehicles" . | ENERGY 312 (2024) . |
| APA | Li, Su , Zhang, Zhizhong , Du, Heng , Zheng, Guoqiang , Zhang, Xiaolong , Li, Zerong . Design and verification of a novel energy-efficient pump-valve primary-auxiliary electro-hydraulic steering system for multi-axle heavy vehicles . | ENERGY , 2024 , 312 . |
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In the composite material hydraulic press, the mismatched velocities between the movable beam and the multiple leveling cylinders produce disturbing superfluous forces, and the eccentric torque causes the movable beam to tilt when pressed. They severely damage the leveling displacement accuracy and limit the implementation of muti-cylinder system in higher precision field. A dual-loop leveling control strategy is proposed, comprising a dual-valve parallel pressure inner loop and an adaptive control displacement outer loop. Firstly, a dual-valve parallel scheme is proposed in the pressure inner loop, where a compensation valve is added in parallel with the original single-valve. A variable compensation valve spool algorithm is designed, considering both velocity and displacement to mitigate the effects of superfluous forces and achieve precise and smooth leveling. Secondly, a control strategy for the adaptive displacement outer loop is designed to estimate and compensate for eccentric torque. An innovative torque decoupling algorithm is formulated to overcome the challenge of indeterminate coupling relations between inner and outer loops caused by the adaptive incorporation of dual-loop control. Then, eccentric load compensation torque is decoupled to the multiple leveling cylinders and derives the desired pressure for the inner loop. The inner loop suppresses the disturbance of eccentric torque to enhance robust leveling precision. Finally, the effectiveness of the proposed strategy was validated through experimentation on the constructed hydraulic press leveling system test bench. The control strategy presented in this paper provides a reference for achieving smooth and precise control in multi-cylinder systems.
Keyword ：
Dual-loop control Dual-loop control Dual-valve parallel Dual-valve parallel Eccentric torque adaptive estimation Eccentric torque adaptive estimation Multiple-cylinder leveling system Multiple-cylinder leveling system Multiple-cylinder torque decoupling Multiple-cylinder torque decoupling
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| GB/T 7714 | Du, Heng , Wu, Ye , Zhang, Zhizhong et al. Multi-cylinder leveling control systems based on dual-valve parallel and adaptive eccentric torque suppression [J]. | MECHATRONICS , 2024 , 104 . |
| MLA | Du, Heng et al. "Multi-cylinder leveling control systems based on dual-valve parallel and adaptive eccentric torque suppression" . | MECHATRONICS 104 (2024) . |
| APA | Du, Heng , Wu, Ye , Zhang, Zhizhong , Wang, Qigang , Luo, Jiahe , Fang, Jinghui . Multi-cylinder leveling control systems based on dual-valve parallel and adaptive eccentric torque suppression . | MECHATRONICS , 2024 , 104 . |
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