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学者姓名：聂松林
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Abstract ：
The stability of the water jet flow used in water-guided laser processing plays a crucial role in determining the quality of the processing process. The present study aims to investigate the effect of water-laser coupling device and nozzle geometry on the stable length of a water-guided laser beam. A numerical model is developed to analyze the internal flow field within the coupling device. Computational fluid dynamics (CFD) simulations are employed to examine how variations in cone nozzle's length-to-diameter ratio, divergence angle, nozzle aperture, and inlet pressure that affect the flow characteristics of water jet. Subsequently, the Latin Hypercube experimental design method is employed to establish parameter samples and construct a Kriging approximation model for the stable length of water-guided laser beam. The Multiple Island Genetic Algorithm (MIGA) is utilized for global optimization of the approximation model, while CFD methods are employed to analyze and validate the optimization results. Finally, experimental verification was conducted to determine the stable length of water-guided laser beam generated by the optimized cone nozzle structure. The research findings demonstrate that the optimized nozzle structure can compensate for approximately 21 mm in the stable distance of water-guided laser beam under the pressure of 5.0 MPa. This study provides valuable guidance for enhancing the performance and engineering applications of laser micro-jet processing technology.
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| GB/T 7714 | Wu, Rui , Nie, Songlin , Ji, Hui et al. Effect of multi-parameter optimization of water-laser coupling device and nozzle geometry on the stability of water-guided laser beam [J]. | PHYSICS OF FLUIDS , 2024 , 36 (1) . |
| MLA | Wu, Rui et al. "Effect of multi-parameter optimization of water-laser coupling device and nozzle geometry on the stability of water-guided laser beam" . | PHYSICS OF FLUIDS 36 . 1 (2024) . |
| APA | Wu, Rui , Nie, Songlin , Ji, Hui , Wang, Yueqi , Lin, Luyan , Yin, Fanglong . Effect of multi-parameter optimization of water-laser coupling device and nozzle geometry on the stability of water-guided laser beam . | PHYSICS OF FLUIDS , 2024 , 36 (1) . |
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Abstract ：
Aiming at the vibration suppression and noise reduction of a direct-drive piston pump system, a novel porous variable diameter Helmholtz pulsation attenuator (abbr. PVDHPA) was developed. The vibration suppression mechanism of PVDHPA was analyzed, and the pressure and flow mathematical model was established. The fluid vibration energy absorption characteristics of PVDHPA with different structural parameters in the direct-drive pump system were analyzed by computational fluid dynamics simulation. The optimized damping hole and maximum diameter of the resonant cavity of the PVDHPA are 6.5 mm and 110 mm, respectively. Based on the custom-manufactured testing apparatus, the vibration absorption effect of the PVDHPA was verified. The test results show that the vibration response amplitude of the direct-drive pump is significantly reduced after the installation of PVDHPA, in which the vibration signals in the 200-400 Hz and 1000 Hz frequency bands are significantly suppressed, and the vibration impact in the vertical direction is most significantly weakened. Meanwhile, the foot vibration acceleration of the direct-drive pump system decreases by 7.4 dB(A). These researches provide an effective method for vibration and noise reduction of the direct-drive pump systems.
Keyword ：
Vibration and noise Vibration and noise Helmholtz pulsation attenuator Helmholtz pulsation attenuator Direct-drive pump system Direct-drive pump system Computational fluid dynamics Computational fluid dynamics
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| GB/T 7714 | Gong, Fei , Nie, Songlin , Huang, Yeqing et al. Research on vibration reduction of direct-drive piston pump based on porous variable diameter Helmholtz pulsation attenuator [J]. | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2023 , 45 (1) . |
| MLA | Gong, Fei et al. "Research on vibration reduction of direct-drive piston pump based on porous variable diameter Helmholtz pulsation attenuator" . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 45 . 1 (2023) . |
| APA | Gong, Fei , Nie, Songlin , Huang, Yeqing , Yin, Fanglong , Hong, Ruidong , Ji, Hui . Research on vibration reduction of direct-drive piston pump based on porous variable diameter Helmholtz pulsation attenuator . | JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING , 2023 , 45 (1) . |
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Abstract ：
Low-frequency vibration control is a crucial challenge within the realm of fluid physics, and in this paper, a novel magnetic compound fluid (MCF) has been developed to produce a magnetic fluid nonlinear energy sink (MF-NES) with optimum energy consumption efficiency. The mixed doping of bi-dispersed nano-sized iron particles (NIPs) and micrometer-sized carbonyl iron particles (CIPs) can generate a load-bearing structure between the inertial mass and the MF-NES shell with a reduced friction coefficient. The effectiveness and sensitivity of the MF-NES mechanism is significantly enhanced, particularly in responding to low frequency vibrations. To predict and quantify the friction coefficient of the MF, a novel hybrid approach combining data handling and a genetic algorithm model was developed and rigorously validated through empirical data obtained from the experiments and demonstrated that the bi-dispersed NIPs/CIPs MCF had a notably lower friction coefficient, making it adept at responding to low-frequency and even ultra-low-frequency vibrations.
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| GB/T 7714 | Nie, Songlin , Gong, Fei , Ji, Hui et al. Effects of micron-nano composite iron particle powders on the tribological properties of magnetic fluids used for a nonlinear energy sink vibration absorber [J]. | PHYSICS OF FLUIDS , 2023 , 35 (9) . |
| MLA | Nie, Songlin et al. "Effects of micron-nano composite iron particle powders on the tribological properties of magnetic fluids used for a nonlinear energy sink vibration absorber" . | PHYSICS OF FLUIDS 35 . 9 (2023) . |
| APA | Nie, Songlin , Gong, Fei , Ji, Hui , Zhang, Le , Ma, Zhonghai , Yin, Fanglong . Effects of micron-nano composite iron particle powders on the tribological properties of magnetic fluids used for a nonlinear energy sink vibration absorber . | PHYSICS OF FLUIDS , 2023 , 35 (9) . |
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Each part of a hydraulic press dissipates a large amount of energy when energy or power is transmitted. Therefore, this study proposes a 3-D vertical arrangement structure for the hydraulic press to reduce their energy dissipation. In the proposed structure, the aboveground and underground spaces are comprehensively utilized, and then the hydraulic equipment are arranged three-dimensionally and set in layers according to the functional requirements. Some equipment is connected directly to minimize the use of valves and pipelines and reduce the transmission distance of hydraulic energy between the pump station and the actuator. Furthermore, a method for scheduling the drive system in the above structure is presented to share a transmission zone with no conflict and shorten their idle time. The composition of each zone is set to match the power demand of each operation to achieve the scheduling schemes. Finally, the proposed scheme is applied to a 31.5 MN hydraulic press as a case study. Results showed that the energy efficiency increased from 43.95% to 85.03%, demonstrating excellent energy-saving potential.
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| GB/T 7714 | Yan, Xiaopeng , Nie, Songlin , Ji, Hui et al. A Novel Energy-Efficient Transmission System and Control Strategy for Hydraulic Machines [J]. | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
| MLA | Yan, Xiaopeng et al. "A Novel Energy-Efficient Transmission System and Control Strategy for Hydraulic Machines" . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2023 (2023) . |
| APA | Yan, Xiaopeng , Nie, Songlin , Ji, Hui , Ma, Zhonghai , Chen, Baijin . A Novel Energy-Efficient Transmission System and Control Strategy for Hydraulic Machines . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
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Abstract ：
The auxiliary support structure is used to prevent the cylinder block from tilting in seawater hydraulic axial piston pump (SHAPP). The failure modes of auxiliary support bearing and shaft under different material combinations were compared. Experimental results show that improper design of radius fitting clearance in auxiliary support bearing/shaft tribopair will seriously affect the normal operation of SHAPP and even lead to its damage. Based on the inertia force, nonlinear water film force and dynamic load balance of the rotating cylinder block, the mathematical model of the nonlinear shaft centerline orbit of the auxiliary support bearing was established. The nonlinear shaft centerline orbit of auxiliary support bearing in the cylinder block bore during SHAPP operation is analyzed accurately. Simultaneously, the water film pressure field under different radius fitting clearance is simulated and the range of the optimal value is determined. The running-in experiment of SHAPP is carried out under the optimum clearance of the auxiliary support bearing/shaft tribopair. The results show that the SHAPP can run normally and the performance is obviously improved without the wear on the friction pair surfaces. Therefore, the proposed method has provided the guidance reference for the design of auxiliary support bearing in SHAPP.
Keyword ：
Seawater hydraulic axial piston pump Seawater hydraulic axial piston pump Dynamic characteristics Dynamic characteristics Nonlinear shaft centerline orbit Nonlinear shaft centerline orbit Fitting clearance Fitting clearance Auxiliary support bearing Auxiliary support bearing shaft shaft
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| GB/T 7714 | Nie, Songlin , He, Hao , Ji, Hui et al. Failure analysis of auxiliary support bearing/shaft tribopair in seawater hydraulic axial piston pump [J]. | ENGINEERING FAILURE ANALYSIS , 2023 , 146 . |
| MLA | Nie, Songlin et al. "Failure analysis of auxiliary support bearing/shaft tribopair in seawater hydraulic axial piston pump" . | ENGINEERING FAILURE ANALYSIS 146 (2023) . |
| APA | Nie, Songlin , He, Hao , Ji, Hui , Nie, Shuang , Yan, Xiaopeng , Yin, Fanglong . Failure analysis of auxiliary support bearing/shaft tribopair in seawater hydraulic axial piston pump . | ENGINEERING FAILURE ANALYSIS , 2023 , 146 . |
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Abstract ：
Hydraulic presses (HPs) are often preferred in metal processing for their high load capacity. Unfortunately, they are also known for their high energy consumption and low energy efficiency. The mismatch between installed and demanded power is the primary cause of low energy efficiency among HPs. To cope with this problem, this paper proposes an energy-recovery method based on a flywheel energy storage system (FESS) to reduce the installed power and improve the energy efficiency of HPs. In the proposed method, the FESS is used to store redundant energy when the demanded power is less than the installed power. During pressing with slow falling, the stored energy is recycled in combination with an AC motor to work against the heavy load, thereby reducing the motor power burden. Furthermore, unlike traditional FESS, a variable frequency drive scheme and specific control scheme are employed to ensure the load characteristics of the motor and improve the energy storage density of the FESS. As different shapes of flywheels have different moments of inertia and energy storage efficiency, this study also examined the energy density of the FESS under different shapes and obtained the best fit shape for the hydraulic power unit. Finally, a test platform is set up to verify the effectiveness of the proposed hydraulic drive system. Results show that the installed power is reduced by approximately 41.9 % and the energy consumption is reduced by 53 %, compared to the traditional HP.
Keyword ：
Flywheel energy storage system Flywheel energy storage system Hydraulic press Hydraulic press Energy saving Energy saving Installed power Installed power Optimal design Optimal design
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| GB/T 7714 | Yan, Xiaopeng , Nie, Songlin , Chen, Baijin et al. Strategies to improve the energy efficiency of hydraulic power unit with flywheel energy storage system [J]. | JOURNAL OF ENERGY STORAGE , 2023 , 59 . |
| MLA | Yan, Xiaopeng et al. "Strategies to improve the energy efficiency of hydraulic power unit with flywheel energy storage system" . | JOURNAL OF ENERGY STORAGE 59 (2023) . |
| APA | Yan, Xiaopeng , Nie, Songlin , Chen, Baijin , Yin, Fanglong , Ji, Hui , Ma, Zhonghai . Strategies to improve the energy efficiency of hydraulic power unit with flywheel energy storage system . | JOURNAL OF ENERGY STORAGE , 2023 , 59 . |
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Abstract ：
Machine learning (ML) methods are becoming popular in prognostics and health management (PHM) of engi-neering systems due to the recent advances of sensor technology and the prevalent use of artificial neural net-works. In practice, mechatronic systems are by nature, prone to degradation/failure due to complex failure mechanisms and other unknown causes. As a result, degradation modeling and prediction of mechatronic sys-tems are quite challenging especially when highly integrative and special operational conditions are considered. To overcome such challenges, artificial neural networks can be employed. This paper proposes the use of a long short-term memory (LSTM)-based multi-input neural network for degradation modeling and prediction of an Electro-Hydrostatic Actuator (EHA) system. The failure mechanisms of the EHA system are explored first, and the obtained physics-of-failure information is utilized in constructing the LSTM neural network to enhance the prediction capability of the model. An actual dataset collected from an EHA test bench is utilized to illustrate the effectiveness of the proposed physics-informed LSTM method for modeling the EHA system's degradation behavior. The result shows that the proposed method provides more accurate life prediction than several benchmark methods for the EHA system.
Keyword ：
Degradation assessment Degradation assessment Feature extraction Feature extraction Long short-term memory Long short-term memory Machine learning Machine learning Electro-hydrostatic actuator Electro-hydrostatic actuator
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| GB/T 7714 | Ma, Zhonghai , Liao, Haitao , Gao, Jianhang et al. Physics-Informed Machine Learning for Degradation Modeling of an Electro-Hydrostatic Actuator System [J]. | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2023 , 229 . |
| MLA | Ma, Zhonghai et al. "Physics-Informed Machine Learning for Degradation Modeling of an Electro-Hydrostatic Actuator System" . | RELIABILITY ENGINEERING & SYSTEM SAFETY 229 (2023) . |
| APA | Ma, Zhonghai , Liao, Haitao , Gao, Jianhang , Nie, Songlin , Geng, Yugang . Physics-Informed Machine Learning for Degradation Modeling of an Electro-Hydrostatic Actuator System . | RELIABILITY ENGINEERING & SYSTEM SAFETY , 2023 , 229 . |
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Abstract ：
The emergence of bionic soft robots has led to an increased demand for bionic soft actuating ends. In this study, a three-dimensional spiral water hydraulic soft actuator (3D-SWHSA), inspired by the winding action of an elephant's trunk, is proposed to provide a more targeted soft actuator catching method. The 3D-SWHSA is composed of multiple bending and twisting units (BATUs), which can produce winding deformation after being pressed. By using the principles of virtual work and integrating the Yeoh 3rd order model, a predictive model for winding was established to investigate the bending and twisting characteristics of BATUs with varying structural parameters through finite element simulation. Following the selection of an optimal set of structural parameters for the 3D-SWHSA, its bending and deformation capabilities were simulated using finite element analysis and subsequently validated experimentally. To validate its flexibility, adaptability, and biocompatibility, successful catching experiments were conducted in both air and underwater environments. Underwater organisms, including organisms with soft appearance such as starfish and sea cucumbers, and organisms with hard shell, such as sea snails and crabs, can also be caught harmlessly. In cases where a single 3D-SWHSA is insufficient for capturing objects with unstable centers of gravity or when the capture range is exceeded, the double 3D-SWHSAs can be utilized for cooperative winding. This study affirms the great potential of 3D-SWHSA in diverse marine applications, including but not limited to marine exploration, fishing, and operations.
Keyword ：
bioinspiration bioinspiration deformation characteristics deformation characteristics underwater manipulator underwater manipulator spiral soft actuator spiral soft actuator water hydraulics water hydraulics
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| GB/T 7714 | Nie, Songlin , Huo, Linfeng , Ji, Hui et al. Deformation Characteristics of Three-Dimensional Spiral Soft Actuator Driven by Water Hydraulics for Underwater Manipulator [J]. | SOFT ROBOTICS , 2023 . |
| MLA | Nie, Songlin et al. "Deformation Characteristics of Three-Dimensional Spiral Soft Actuator Driven by Water Hydraulics for Underwater Manipulator" . | SOFT ROBOTICS (2023) . |
| APA | Nie, Songlin , Huo, Linfeng , Ji, Hui , Nie, Shuang , Gao, Pengwang , Li, Hanyu . Deformation Characteristics of Three-Dimensional Spiral Soft Actuator Driven by Water Hydraulics for Underwater Manipulator . | SOFT ROBOTICS , 2023 . |
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Abstract ：
Inspired by human hands and wrists, an anthropomorphic soft manipulator (ASM) driven by water hydraulics is proposed for underwater operations and exploration. Compared with traditional rigid manipulator, ASM has highly evolved grasping ability with better flexibility and adaptability, while it has better load capacity, grasping ability, and flexibility in comparison with the pneumatic gripper. ASM wrist is composed of rigid-flexible coupling structure with three bellows and a spindle, which generates continuous wrist pitching. The linear elongate characteristics of bellows and pitching performance of ASM wrist are simulated by finite element modeling (FEM) method and tested experimentally. The mathematical model of bending deformation for the water hydraulic soft gripper (WHSG) is established. The bending deformation and contact force of WHSG are simulated by FEM and measured experimentally. The ASM prototype is fabricated, and the grasping experiments in the air and underwater are conducted. It is confirmed that the developed ASM can switch between standard and expanded grasping position to adopt and grasp objects of different shapes and dimensions. And living animals with rough or smooth surfaces such as turtle and carp can also be caught harmlessly. ASM also exhibits preferable adaptability when the objects are out of grasping range or deviating from the grasping center. This study confirms that the developed ASM has enormous application potentials and broader prospects in the field of underwater operation, underwater fishing, underwater sampling, etc.
Keyword ：
bending deformation bending deformation bioinspiration bioinspiration soft gripper soft gripper water hydraulics water hydraulics underwater manipulator underwater manipulator
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| GB/T 7714 | Ji, Hui , Lan, Yu , Nie, Songlin et al. Development of an Anthropomorphic Soft Manipulator with Rigid-Flexible Coupling for Underwater Adaptive Grasping [J]. | SOFT ROBOTICS , 2023 , 10 (6) : 1070-1082 . |
| MLA | Ji, Hui et al. "Development of an Anthropomorphic Soft Manipulator with Rigid-Flexible Coupling for Underwater Adaptive Grasping" . | SOFT ROBOTICS 10 . 6 (2023) : 1070-1082 . |
| APA | Ji, Hui , Lan, Yu , Nie, Songlin , Huo, Linfeng , Yin, Fanglong , Hong, Ruidong . Development of an Anthropomorphic Soft Manipulator with Rigid-Flexible Coupling for Underwater Adaptive Grasping . | SOFT ROBOTICS , 2023 , 10 (6) , 1070-1082 . |
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Abstract ：
An integrated slipper/swashplate structure is developed for seawater hydraulic axial piston pump. Considering the overturning moment of the integrated slipper, the transient hydrodynamic lubrication model of the integrated slipper is established, and the body-fitted grid and five-point finite difference method is employed to accurately solve the model. An optimization design method based on a hybrid of CFD (Computational Fluid Dynamics) and PSO (Particle Swarm Optimization) for the integrated slipper is proposed for the interface structure with the low leakage and power loss. The optimal sealing belt of the integrated slipper is obtained, and the leakage and power loss are reduced by 27.3% and 16.7% under the same gap size, respectively. The effects of working condition on the film-forming characteristics and power consumption characteristics of the lubricating film are analyzed based on the optimized integrated slipper. It is found that the leakage and total power loss increase significantly with the increasement of working pressure and shaft speed, and decrease with the increasement of temperature. The excellent lubrication characteristics and strong anti-overturning ability of the integrated slipper/swashplate structure can improve the performance of the seawater axial piston pump, and its optimization design method proposed in this study can provide a new reference for engineers.
Keyword ：
Hydrodynamic lubrication Hydrodynamic lubrication seawater hydraulic axial piston pump seawater hydraulic axial piston pump integrated slipper integrated slipper PSO PSO
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| GB/T 7714 | Hong, Ruidong , Ji, Hui , Nie, Songlin et al. A hybrid of CFD and PSO optimization design method of the integrated slipper/swashplate structure in seawater hydraulic axial piston pump [J]. | ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS , 2022 , 16 (1) : 2122-2141 . |
| MLA | Hong, Ruidong et al. "A hybrid of CFD and PSO optimization design method of the integrated slipper/swashplate structure in seawater hydraulic axial piston pump" . | ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS 16 . 1 (2022) : 2122-2141 . |
| APA | Hong, Ruidong , Ji, Hui , Nie, Songlin , He, Hao , Guo, Ming , Yin, Fanglong et al. A hybrid of CFD and PSO optimization design method of the integrated slipper/swashplate structure in seawater hydraulic axial piston pump . | ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS , 2022 , 16 (1) , 2122-2141 . |
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