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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 ：
In this study, a series dual-chamber self-excited oscillation nozzle (SDSON) for atomization was developed for photodecomposition of oily wastewater. In order to address the computational complexity associated with optimizing this nozzle, a surrogate model that integrates computational fluid dynamics simulation is proposed. By employing a multi-objective optimization algorithm that combines Genetic Algorithm and Non-dominated Sorting Genetic Algorithm II, significant improvements in atomization performance have been achieved. The influencing factors of atomization and their interactions on the nozzle's atomization performance have been analyzed. The entropy weight method was employed in conjunction with gray theory to rank the optimal solutions based on weighted correlation evaluation, resulting in the determination of the most favorable design solutions. The optimized design exhibited significant enhancements in turbulence kinetic energy and gas volume fraction at the nozzle outlet. Atomization experiments confirmed that the optimized SDSON generated smaller and more uniformly sized droplets under identical inlet pressure conditions, thereby greatly improving atomization performance.
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| GB/T 7714 | Nie, Songlin , Song, Yuwei , Ji, Hui et al. Atomization performance optimization of series dual-chamber self-excited oscillation nozzle using the entropy weight method combined with gray theory [J]. | PHYSICS OF FLUIDS , 2024 , 36 (9) . |
| MLA | Nie, Songlin et al. "Atomization performance optimization of series dual-chamber self-excited oscillation nozzle using the entropy weight method combined with gray theory" . | PHYSICS OF FLUIDS 36 . 9 (2024) . |
| APA | Nie, Songlin , Song, Yuwei , Ji, Hui , Qin, Tingting , Yin, Fanglong , Ma, Zhonghai . Atomization performance optimization of series dual-chamber self-excited oscillation nozzle using the entropy weight method combined with gray theory . | PHYSICS OF FLUIDS , 2024 , 36 (9) . |
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Abstract ：
Seawater reverse osmosis (SWRO) technology has been universally adopted because of its high efficiency, economic benefits, easy maintenance, and high-pressure seawater pump (HPSP) and energy recovery device (ERD) are essential components, which determine the specific energy consumption of SWRO system. However, it is still unclear about energy dissipation mechanism and mixing characteristics from the perspective of system. For that, this thesis proposes a novel system-level Computational Fluid Dynamics (CFD) model considering all interfaces in HPSP and integrated energy recovery and pressure boost device (IERPBD). To profoundly investigate the system performance under various operating conditions, the pressure and composition distribution, power loss of each interface and mixing rate are numerically calculated and analyzed. Additionally, experiment of the effect of temperature on SWRO system performance is conducted to practically verify the proposed model, which indicates that the presented model could precisely reflect the energy dissipation and mixing characteristics. Besides, it is advised that the rotating speed of HPSP and IERPBD should not be set too high which could increase the mixing rate and energy consumption, and higher temperature might lower the quality of produced freshwater. This study offers a feasible way to reveal the energy dissipation mechanism of SWRO desalination system.
Keyword ：
Power loss Power loss SWRO system SWRO system Energy dissipation mechanism Energy dissipation mechanism Mixing characteristics Mixing characteristics System-level CFD model System-level CFD model
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| GB/T 7714 | Yin, Fanglong , Zhang, Yu , Nie, Songlin et al. A system-level CFD simulation model for investigating the energy dissipation mechanism of seawater pump and rotary energy recovery device in SWRO desalination system [J]. | DESALINATION , 2024 , 587 . |
| MLA | Yin, Fanglong et al. "A system-level CFD simulation model for investigating the energy dissipation mechanism of seawater pump and rotary energy recovery device in SWRO desalination system" . | DESALINATION 587 (2024) . |
| APA | Yin, Fanglong , Zhang, Yu , Nie, Songlin , Ji, Hui , Ma, Zhonghai . A system-level CFD simulation model for investigating the energy dissipation mechanism of seawater pump and rotary energy recovery device in SWRO desalination system . | DESALINATION , 2024 , 587 . |
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This study proposes a multi-fidelity efficient global optimization framework for the structural optimization of self-excited oscillation cavity. To construct a high-precision multi-fidelity surrogate model to correlate the structural parameters of a self-excited oscillation cavity with the gas precipitation and energy consumption characteristics by effectively fuzing the information of different fidelity levels, choosing different correlation functions and hyper-parameter estimation methods, and learning the correlation between the data. The optimization framework determines various sampling methods and quantities by calculating the minimum Euclidean distance between sample points and sensitivity index. To enhance computational efficiency, a multi-fidelity sample library is established by utilizing both precise and coarse computational fluid dynamics grids. The expected improvement criterion-based algorithm for global optimization is employed as an additive strategy to incorporate additional data points into the model. This approach considers both local and global search of the model, thereby enhancing sample accuracy while reducing computation time. Moreover, the utilization of the highly generalized Non-dominated Sorting Genetic Algorithm-II (NSGA-II) for identifying the Pareto optimal solution set enhances convergence speed. The proposed optimization framework in this study achieves a remarkable level of model accuracy and provides optimal solutions even with a limited sample size. It can be widely used in engineering optimization problems.
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| GB/T 7714 | Nie, Songlin , Li, Mingshuai , Nie, Shuang et al. Optimization framework for multi-fidelity surrogate model based on adaptive addition strategy-A case study of self-excited oscillation cavity [J]. | PHYSICS OF FLUIDS , 2024 , 36 (7) . |
| MLA | Nie, Songlin et al. "Optimization framework for multi-fidelity surrogate model based on adaptive addition strategy-A case study of self-excited oscillation cavity" . | PHYSICS OF FLUIDS 36 . 7 (2024) . |
| APA | Nie, Songlin , Li, Mingshuai , Nie, Shuang , Ji, Hui , Hong, Ruidong , Yin, Fanglong . Optimization framework for multi-fidelity surrogate model based on adaptive addition strategy-A case study of self-excited oscillation cavity . | PHYSICS OF FLUIDS , 2024 , 36 (7) . |
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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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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 ：
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 ：
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 ：
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 ：
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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