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学者姓名：俞建超
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Abstract ：
Heavy-duty vehicles with long bodies, a large number of axles and large loads are subject to increasingly high requirements for precise steering technology due to the increasing trend toward energy conservation and intelligent assisted driving as well as variable driving conditions. In this paper, an energy-efficient open circuit variable-speed pump-controlled steering system (OPCEHSSS) adapted for heavy loads is used, but its strong flow output nonlinearity and system nonlinear dynamic behavior greatly impede the steering performance. Therefore, in order to reduce the influence of the flow leakage of the fixed-displacement pump on the system and to ensure that the flow output of the system matches the control model, a mapping model based on the fitting of a two-layer neural network algorithm with a dynamic real-time compensation strategy (FNC) is proposed. In addition, considering the strong robustness of the system even under parameter uncertainty and unknown disturbance, a complex nonlinear mathematical model is established based on OPCEHSSS physical characteristics, and a dual-objective control strategy of steering angle and pressure based on sliding mode control (SMC) is proposed. However, in order to reduce the influence of high-order switching discontinuity on the steering and ensure the fast convergence of the control system, a fast super twisting algorithm (STA) based on double saturation function of the boundary layer is proposed. The experimental results show that the three different controllers can effectively reduce the steering angle error after the introduction of FNC. And in the case of a single axle loaded with 6 tons, the improved new FNC+STA integrated dual-objective control strategy improves the accuracy by 53.16% compared with PID and 40.67% compared with SMC. The steady-state error is maintained within 0.9 degrees, realizing the high-performance steering tracking control of OPCEHSSS for heavy vehicles.
Keyword ：
dual-objective control dual-objective control flow nonlinear mapping and compensation flow nonlinear mapping and compensation Heavy vehicle steering system Heavy vehicle steering system pump control system pump control system steering tracking steering tracking super twisting algorithm super twisting algorithm two-layer neural network algorithm two-layer neural network algorithm
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| GB/T 7714 | Lin, Xiezhao , Xu, Jun , Yu, Jianchao et al. High-performance steering tracking control of open circuit variable-speed pump-controlled steering system for heavy-duty vehicles based on flow nonlinearity compensation [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING , 2024 . |
| MLA | Lin, Xiezhao et al. "High-performance steering tracking control of open circuit variable-speed pump-controlled steering system for heavy-duty vehicles based on flow nonlinearity compensation" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING (2024) . |
| APA | Lin, Xiezhao , Xu, Jun , Yu, Jianchao , Zhang, Xiaolong , Zheng, Yulan , Li, Su et al. High-performance steering tracking control of open circuit variable-speed pump-controlled steering system for heavy-duty vehicles based on flow nonlinearity compensation . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING , 2024 . |
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The current, electromagnetic force, and dynamic displacement of the high-speed on/off valve's (HSV) electromechanical converter under stable working cycle are significantly different from those under the initial movement cycle. This phenomenon determines whether the electromechanical converter can continue to operate stably, and it also leads to temperature rise and high energy consumption over long periods of time. Therefore, in this study, a high-precision model is proposed that can fully analyze the characteristics of the electromechanical converter under multiple motion cycles with the consideration of the effects of eddy current and hysteresis. First, the hysteresis loop of the material is tested, and the Jiles-Atherton hysteresis model is identified based on the test data and verified through experiments. Second, the fundamental reasons for the differences in current and electromagnetic forces between initial motion and stable motion are analyzed. On this basis, a new law of dynamic evolution of electromechanical converters under multiple motion cycles is discovered. Finally, the important influence of hysteresis characteristics and eddy current on the dynamic performance and energy loss of the electromechanical converter under multiple motion cycles is analyzed. The effects of frequency, voltage, and external resistance on the dynamic characteristics and energy loss of electromechanical converters have also been analyzed. The results indicate that as the voltage increases, the response time decreases, but the eddy current loss increases. An increase in external resistance will increase response time but reduce eddy current losses. This study can provide a theoretical basis for further improving the performance of electromechanical converters.
Keyword ：
Eddy current Eddy current Eddy currents Eddy currents electromechanical converter electromechanical converter energy consumption energy consumption high-speed on/off valve (HSV) high-speed on/off valve (HSV) hysteresis hysteresis Soft magnetic materials Soft magnetic materials
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| GB/T 7714 | Chen, Shaorong , Li, Qizheng , Huang, Hui et al. Dynamic Characteristics and Energy Consumption of Electromechanical Converter of High-Speed On/Off Valve Under Multiple Motion Cycles Considering Eddy Current and Hysteresis [J]. | IEEE TRANSACTIONS ON MAGNETICS , 2024 , 60 (3) . |
| MLA | Chen, Shaorong et al. "Dynamic Characteristics and Energy Consumption of Electromechanical Converter of High-Speed On/Off Valve Under Multiple Motion Cycles Considering Eddy Current and Hysteresis" . | IEEE TRANSACTIONS ON MAGNETICS 60 . 3 (2024) . |
| APA | Chen, Shaorong , Li, Qizheng , Huang, Hui , Chen, Shumei , Du, Heng , Li, Yuzheng et al. Dynamic Characteristics and Energy Consumption of Electromechanical Converter of High-Speed On/Off Valve Under Multiple Motion Cycles Considering Eddy Current and Hysteresis . | IEEE TRANSACTIONS ON MAGNETICS , 2024 , 60 (3) . |
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Abstract ：
Steering system of heavy vehicle facing intelligent and green development needs to satisfy the requirements of high precision and energy-efficient dynamic steering. Traditional steering systems use valved servo systems, which offer high steering accuracy but result in significant energy dissipation at the valve ports. In contrast, the variable speed pump control system (VSPCS) realizes the precise servo of steering system through direct volume control, which basically eliminates the energy dissipation at the valve port. However, the VSPCS lacks sufficient system stiffness due to low back pressure, making it difficult to achieve precise steering. To address these limitations, this paper proposes a back pressure controllable variable speed pump controlled steering system scheme (BCVSPCSS), which combines the energy-efficient flow supply of the VSPCS with a servo-proportional valve is used for back pressure control to, improving the dynamic performance of the system. This integration allows for precise steering while maintaining energy efficiency; The design of a dual objective nonlinear control strategy for angle and back pressure is crucial to deal with uncertainty and nonlinearity in the system. The Lyapunov analysis shows that the closed-loop system has asymptotic stability. In this paper, the experimental bench of BCVSPCSS is built for experimental verification. The results show that back pressure control effectively enhances the system's immunity. Under the same working conditions, the maximum angle error of the two systems is roughly the same, both around 1 degrees, while the energy consumption of BCVSPCSS is reduced by about 84.6% compared to the valve controlled steering system.
Keyword ：
back pressure back pressure energy saving control energy saving control Steering system of heavy vehicle Steering system of heavy vehicle steering tracking steering tracking variable speed pump control system variable speed pump control system
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| GB/T 7714 | Du, Heng , Li, Hanjin , Ding, Kaiyi et al. Research on energy saving and control characteristics of back pressure controllable variable speed pump controlled steering system for heavy vehicles [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING , 2024 . |
| MLA | Du, Heng et al. "Research on energy saving and control characteristics of back pressure controllable variable speed pump controlled steering system for heavy vehicles" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING (2024) . |
| APA | Du, Heng , Li, Hanjin , Ding, Kaiyi , Li, Su , Yu, Jianchao . Research on energy saving and control characteristics of back pressure controllable variable speed pump controlled steering system for heavy vehicles . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING , 2024 . |
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Temperature distribution and heat partition have a significant impact on tool life and machined surface integrity in metal cutting process. In this work, the concept of non-uniform heat partition of the shear heat source on the shear plane was proposed, and an improved cutting thermal model was proposed based on this concept. The improved thermal model had a continuous temperature field at the shear plane compared with the previous thermal model. Comparing the thermal model before and after improvement with the finite element model (FEM), it was found that the temperature distribution of the improved thermal model was closer to the FEM. In addition, a calculation method for the heat partition coefficient of the shear heat source considering mass transfer and the ratio of the heat flow entering workpiece, chip and tool to the total heat generated during the cutting process were proposed based on the improved thermal model. The results were compared with the regression models proposed before, and showed that the shear angle is an indispensable factor for analyzing the heat flow in the cutting process when the thermophysical properties of workpiece remain unchanged.
Keyword ：
Heat flow Heat flow Metal cutting Metal cutting Non -uniform heat partition Non -uniform heat partition Temperature field Temperature field
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| GB/T 7714 | Ding, Yuxing , Yu, Jianchao . An improved thermal model for the orthogonal cutting considering non-uniform heat partition of shear heat source [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2023 , 190 . |
| MLA | Ding, Yuxing et al. "An improved thermal model for the orthogonal cutting considering non-uniform heat partition of shear heat source" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 190 (2023) . |
| APA | Ding, Yuxing , Yu, Jianchao . An improved thermal model for the orthogonal cutting considering non-uniform heat partition of shear heat source . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2023 , 190 . |
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The hydraulic switching transformer is a pressure conversion device similar to a dc/dc converter in electronic switching mode. However, the energy efficiency of the system is reduced by the throttling loss generated by switching on/off valves. Therefore, this article proposes a new hydraulic soft-switching scheme to reduce the switching throttling loss and improve the energy efficiency of the hydraulic switching transformer system, which is similar to the zero-current conversion technology in the electronic switching mode. By setting up a temporary flow path to the tank at the valve port, introducing an auxiliary control system in the system to control the opening of the temporary flow path when the switching valve is switched, reducing the fluid passing through the valve port when the switching valve is switched, and decreasing the pressure difference between the two ends, thus reducing the throttling loss of the switching valve and improving the energy efficiency of the system. Simulation and experimental results show that, after the addition of the auxiliary fluid delivery system, the switching throttling loss of the on/off valve is greatly reduced, and the energy efficiency of the system is improved; in the experiments, the energy efficiency of the system can be improved by up to 11%.
Keyword ：
Energy efficiency Energy efficiency fluid paths fluid paths hydraulic soft switches hydraulic soft switches throttling losses throttling losses
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| GB/T 7714 | Du, Heng , Chen, Chaofan , Yu, Jianchao et al. Design and Verification of a New Hydraulic Soft Switching Transformer Based on an Auxiliary Fluid Delivery System [J]. | IEEE-ASME TRANSACTIONS ON MECHATRONICS , 2023 , 29 (3) : 2184-2195 . |
| MLA | Du, Heng et al. "Design and Verification of a New Hydraulic Soft Switching Transformer Based on an Auxiliary Fluid Delivery System" . | IEEE-ASME TRANSACTIONS ON MECHATRONICS 29 . 3 (2023) : 2184-2195 . |
| APA | Du, Heng , Chen, Chaofan , Yu, Jianchao , Zeng, Liwen , Ye, Xujun , Chen, Rongzhu . Design and Verification of a New Hydraulic Soft Switching Transformer Based on an Auxiliary Fluid Delivery System . | IEEE-ASME TRANSACTIONS ON MECHATRONICS , 2023 , 29 (3) , 2184-2195 . |
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Abstract ：
本实用新型提出一种恒温恒压的高速摩擦装置，包括摩擦副和对其加热的加热组件，还包括控制模块、测量摩擦副摩擦力的测力仪、测量摩擦副摩擦界面温度的热红外成像仪；摩擦副包括由销夹具固定的销，还包括由外部机构驱动旋转的摩擦盘；销夹具的移动由带伺服阀的气缸驱动；加热组件以加热线圈(9)对销加热；加热线圈环绕于销处；所述测力仪通过底板(1)安装于外部机构的滑座(14)处，测力仪上方安装有带导轨(7)的夹板(3)；所述导轨上安装有滑块(6)；所述滑块处设有加热线圈和与之相连的电压控制器(10)；本实用新型可以在实验中实现摩擦界面温度和接触压力的精准控制，且可以快速加热，快速更换试样，有效提高了实验的可靠性和效率。
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| GB/T 7714 | 俞建超 , 丁宇星 . 一种恒温恒压的高速摩擦装置 : CN202222785437.3[P]. | 2022-10-22 00:00:00 . |
| MLA | 俞建超 et al. "一种恒温恒压的高速摩擦装置" : CN202222785437.3. | 2022-10-22 00:00:00 . |
| APA | 俞建超 , 丁宇星 . 一种恒温恒压的高速摩擦装置 : CN202222785437.3. | 2022-10-22 00:00:00 . |
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Abstract ：
目的 满足T2纯铜与日俱增的加工需求,改善T2纯铜的加工质量,探究不同铣削速度下刀具损伤和已加工表面形貌之间的内在联系.方法 根据单因素试验结果 ,研究铣削速度对于刀具磨损的影响.在磨损刀具铣削力模型和已加工表面应力模型的基础上,从铣削力、刀具损伤形式以及磨损机理出发,分析刀具磨损对于已加工表面质量的影响,解析表面缺陷产生的原因,并通过光学和电子显微镜对磨损后的刀具表面形貌及已加工表面缺陷进行分类表征.结果 当铣削速度较低时,刀具严重的崩刃现象引起了系统铣削力急剧增加,这极大的破坏了铣削系统的稳定性和已加工表面的应力状态,并导致表面粗糙度增大,形成颤振波纹、表面撕裂等加工缺陷.而当铣削速度较高时,由于刀具的损伤较轻,铣削系统相对稳定,已加工表面仍然保持较好的加工质量,特别是铣削速度为600 m/min时,表面粗糙度Sa和Sq的值达到了1.80μm和2.25μm,在刀具磨损后仍然分别保持在2.20μm和3.10μm左右.结论 在T2纯铜的铣削加工中,提高铣削速度对延长刀具寿命,改善已加工表面质量有积极作用.
Keyword ：
T2纯铜 T2纯铜 刀具磨损 刀具磨损 表面缺陷 表面缺陷 高速铣削 高速铣削
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| GB/T 7714 | 刘屹 , 林有希 , 俞建超 . T2纯铜高速铣削刀具磨损对表面形貌的影响 [J]. | 表面技术 , 2022 , 51 (10) : 301-309,369 . |
| MLA | 刘屹 et al. "T2纯铜高速铣削刀具磨损对表面形貌的影响" . | 表面技术 51 . 10 (2022) : 301-309,369 . |
| APA | 刘屹 , 林有希 , 俞建超 . T2纯铜高速铣削刀具磨损对表面形貌的影响 . | 表面技术 , 2022 , 51 (10) , 301-309,369 . |
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Due to the sticky and soft characteristics of aluminum alloy, it is easy to form adhesion on the tool rake face during cutting process. In this work, the orthogonal cutting tests for 6061-T6 aluminum were carried out at cutting speeds of 20-300 m/min and feed rates of 0.05-0.3 mm, and the relationship between adhesion and cutting force has been explored. A slip-line model was used to separate the edge force of cutting edge to obtain the pure friction force of tool rake face, thereby obtaining the average friction coefficient. Adhesion morphologies were observed under the scanning electron microscope (SEM) and compared with the average friction coefficients. It was found that different adhesion morphologies correspond to different friction coefficient ranges. Simultaneously, the relationship between the temperature and normal stress on the tool rake face and the adhesion morphology and friction coefficient was investigated. The results showed that the temperature is the major factor of adhesion evolution and friction coefficient change. Combining the tool rake face temperature and the adhesion morphology, it was noted that the reduction of the friction coefficient is not only owing to the self-lubrication caused by thermal softening, but also due to the decrease of the total shear force caused by the incomplete contact. Finally, the relationship between the friction coefficient of tool rake face and the cutting force and specific cutting energy was discussed, with the conclusion that the friction coefficient has an impact on the cutting force and specific cutting energy by changing the shear angle.
Keyword ：
6061-T6 aluminum alloy 6061-T6 aluminum alloy Adhesion Adhesion Cutting force Cutting force Friction coefficient Friction coefficient
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| GB/T 7714 | Ding, Yuxing , Yu, Jianchao , Lu, Zhikai . The relationship between adhesion morphology and cutting force in orthogonal cutting of 6061-T6 aluminum alloy [J]. | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 124 (5-6) : 1971-1991 . |
| MLA | Ding, Yuxing et al. "The relationship between adhesion morphology and cutting force in orthogonal cutting of 6061-T6 aluminum alloy" . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY 124 . 5-6 (2022) : 1971-1991 . |
| APA | Ding, Yuxing , Yu, Jianchao , Lu, Zhikai . The relationship between adhesion morphology and cutting force in orthogonal cutting of 6061-T6 aluminum alloy . | INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY , 2022 , 124 (5-6) , 1971-1991 . |
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有限元方法是研究切削加工中切削机制的一个重要途径。在OXLEY解析模型中，切削过程中的剪切角、第一变形区剪切带宽度以及第二变形区剪切带宽度，是研究切削力、切削温度等的重要基础。建立Deform2D切削模型，通过后处理界面测量剪切角。在考虑第二变形区剪切应变的情况下，建立新的剪切角求解模型。将新的剪切角模型与测量得到的剪切角对比，具有较好的一致性。最后通过应变率、应变分布云图，分别确定了第一、第二剪切带厚度，并探究其与切削速度、切深的关系。
Keyword ：
OXLEY模型 OXLEY模型 剪切带宽度 剪切带宽度 剪切角 剪切角
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| GB/T 7714 | 丁宇星 , 俞建超 , 鲁治锴 . 直角切削剪切角与剪切带有限元仿真分析 [J]. | 机床与液压 , 2022 , 50 (16) : 114-118 . |
| MLA | 丁宇星 et al. "直角切削剪切角与剪切带有限元仿真分析" . | 机床与液压 50 . 16 (2022) : 114-118 . |
| APA | 丁宇星 , 俞建超 , 鲁治锴 . 直角切削剪切角与剪切带有限元仿真分析 . | 机床与液压 , 2022 , 50 (16) , 114-118 . |
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The increase of machining distance is inevitably accompanied by the increase of tool wear, which also leads to the deterioration of the machined surface quality. In order to satisfy the increasing processing needs of T2 pure copper and improve the processing quality of T2 pure copper, the work aims to study the internal relationship between tool wear and machined surface morphology at different milling speeds. The experiment takes milling speed as independent variable. According to the single factor test results, the influence of milling speed on tool wear is studied. On the basis of wear tool milling force model and machined surface stress model, the influence of tool wear on machined surface quality and the reason of surface defects are analyzed from milling force, tool damage form and wear mechanism. The tool wear morphology and the machined surface defects are classified and characterized by optical microscope and scanning electron microscope. When the milling speed is low, there is intense extrusion friction between the rake face and the chip due to the relatively large milling force Fx in the feed direction, resulting in scratches and grooves on the rake face. Lower milling speed means longer machining time at the same milling distance, it results that the cutting tool in processing not only should take more cycle load, but also bear more impact times. It is easy to cause the stress concentration at tool tip, so as to make the cutting edge break and tear. Severe tool wear often results in the change of tool geometry and the further deterioration of tool stress state, which destroys the stability of milling system, leads to flutter ripple on workpiece surface, and greatly increases the roughness of machined surface. Tool wear will change the actual friction form between cutter and workpiece and affect the machining surface stress state, so that the tearing stress on the workpiece surface exceeds the yield strength of the material, and then form the surface tearing. However, when the milling speed is higher, the milling system is relatively stable due to the lighter damage of the tool, and the machined surface still maintains good machining quality. Especially when milling speed is 600 m/min, the surface roughness Sa and Sq reaches 1.80 μm and 2.25 μm. It remains around 2.20 μm and 3.10 μm when the tool is worn. In the milling of T2 pure copper, increasing the milling speed has a positive effect on prolonging the tool life and improving the quality of the machined surface. © 2022, Chongqing Wujiu Periodicals Press. All rights reserved.
Keyword ：
Copper Copper Cutting tools Cutting tools Deterioration Deterioration Friction Friction Milling (machining) Milling (machining) Morphology Morphology Scanning electron microscopy Scanning electron microscopy Surface defects Surface defects Surface morphology Surface morphology Surface roughness Surface roughness Surface stress Surface stress Wear of materials Wear of materials
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| GB/T 7714 | Liu, Yi , Lin, You-Xi , Yu, Jian-Chao . The Influence of Tool Wear on Surface Morphology in T2 Pure Copper High Speed Milling [J]. | Surface Technology , 2022 , 51 (10) : 301-309 and 369 . |
| MLA | Liu, Yi et al. "The Influence of Tool Wear on Surface Morphology in T2 Pure Copper High Speed Milling" . | Surface Technology 51 . 10 (2022) : 301-309 and 369 . |
| APA | Liu, Yi , Lin, You-Xi , Yu, Jian-Chao . The Influence of Tool Wear on Surface Morphology in T2 Pure Copper High Speed Milling . | Surface Technology , 2022 , 51 (10) , 301-309 and 369 . |
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