bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and Simulation of the Power Transmission System of extended range electric Vehicle based on MATLAB/Simulink
Authors: Zhang Chundong 
Published: August 2023

Abstract
With the rapid growth of automobile ownership, energy shortage and exhaust pollution have become the two major problems restricting the development of automobiles. Electric vehicles with zero fuel consumption and pollution-free advantages are the future direction of development. But battery technology is not mature at this stage, and the driving distance of electric vehicles is short. Extended range electric vehicle is a hybrid electric vehicle equipped with a range extender based on a pure electric vehicle. When the power is sufficient, the whole vehicle runs with pure electric power. When the power is insufficient, the range extender works to drive the vehicle. As a kind of electric vehicle that can extend driving range, the extended-range electric vehicle has great research significance at present. In this paper, based on MATLAB/Simulink platform, the simulation model of the vehicle power transmission system is built by using the experimental modeling method. According to the model, the dynamic performance simulation of the extended-range electric vehicle is carried out, and the rationality of parameter matching of the vehicle components is verified.
Fast detection of short circuits in low-voltage AC systems based on wavelet packet transform and current change rate
Authors: Yang Tao , Miao XiRen , Zhuang ShengBin 
Published: August 2023

Abstract
The safe and stable operation of a new low-voltage power system requires the research and application of fast detection technology of short-circuit faults. However, the existing methods are difficult to effectively realize the rapidity and reliability in case of short circuits with unclear features and various interference conditions. Therefore, the fault feature of short-circuit current in the full phase angle range is analyzed, and a new method of short-circuit detection based on wavelet packet transform and current change rate is proposed. Among them, the fast-action detection method of wavelet packet transform is used for faults with obvious features to achieve detection rapidity, and the double criteria backup detection method of wavelet packet transform and current change rate is used for faults with unclear features to ensure detection reliability. On this basis, the hardware technology realization of short-circuit fault fast detection algorithm is studied. For short circuit faults, load startup, load switching, and other situations, the real low-voltage AC system experiment is carried out to verify. Finally, the test shows that the detection method can effectively and rapidly detect short-circuit faults within 1ms in the full phase angle range, and has robustness under interference conditions.
Capacitor Voltage Weighted Full Feedforward Control Strategy for Adaptability Enhancing of LCL Grid-Connected Inverter Under Weak Grid
Authors: Li Zhihong , Wang Xiaogang 
Published: August 2023

Abstract
A capacitor-voltage full feedforward strategy is generally utilized to enhance the stabilization of the LCL grid-connected inverter. Meanwhile, the digitally controlled retardation leads to a phase lag of about 90° in the inverter’s export impedance on account of the introduction of the feed-forward loop, which influences the adaptation of the grid-connected inverter for a weakened grid. This investigation proposed a capacitor voltage-weighted full feedforward approach, which uses weighting coefficients to correct the inverter’s output impedance at various frequencies. In this way, the robustness of the grid-connected inverter operating at weak network conditions is improved. The proposal is validated by a combination of dramatic theoretical arguments and experimental findings.
Control Strategy Based on Improved Sliding Mode Control for T-type 3L PV Grid-connected Inverter
Authors: Sun Yang , Fan Zhengzhen , Yin Yuanya 
Published: August 2023

Abstract
This paper analyzes the mathematical model and working principle of a T-type 3 L PV inverter and introduces the control structure of a grid-connected PV inverter. In view of the influence of the sliding mode controller (SMC) rooted on the traditional reaching law (RL) on the control performance for grid-connected PV inverters as the current inner loop, such as large THD, this paper proposes a novel RL in the inner loop SMC to improve the tracking effect and robustness of the controller. The design method of each link of the SMC based on the proposed novel RL is described in the paper. Then, the stability analysis of the improved SMC is carried out. The experiment has been carried out on the experimental operating platform of the T-type 3 L PV grid-connected inverter system. The experimental results allow expressing that the designed control strategy can modify the dynamic performance of the system, reduce the harmonic distortion rate of the incoming current, and maintain the system with strong anti-interference capability under the premise of making the PV power generation system operate stably.
Collaborative configuration and optimal operation of cogeneration system based on phase change heat storage
Authors: Yu Changle , Ji Yanchen , Zhu Yuanda , Wang Junqi , Shi Xingcai , Li Yue 
Published: August 2023

Abstract
Given the low efficiency of heating and power supply caused by the low temperature in the Northeast during the heating process of the solar heat pump, the article first adds phase change hot storage device based on time-sharing control based on the traditional PVT collector — heat pump, and constructs a flexible thermoelectric coupling multi-energy system by shifting the peak and filling the valley; Secondly, based on TRNSYS software, the simulation model of PVT collector-heat pump-phase change heat storage-electrical coupling combined supply system is built. By comparing with the heat storage system using an ordinary heat storage tank, the results show that the phase change water tank system can significantly improve the system performance. Finally, Hooke-Jeeves is used to optimize the inclination angle, area, volume of the tank, and heating capacity of the air source heat pump of the PVT collector of the thermal-electric coupling system, to increase the system’s one-year operation.
Integrated Control Strategy of Voltage and Frequency Modulation for the Photovoltaic-storage Unit
Authors: Liu Hongwei , Zheng Zunguo 
Published: August 2023

Abstract
With the increasing installation of new energy power generation, photovoltaic power generation has become a significant component of the power system. However, the random and fluctuating nature of photovoltaic power generation can pose a challenge. The combination of photovoltaic power generation with energy storage using a photovoltaic-storage unit integrated machine can help mitigate the fluctuations of photovoltaic power generation output and improve the power quality of photovoltaic grid connection. In this paper, we propose a grid-connected integrated control strategy for the photovoltaic-storage unit integrated machine. We use a hybrid energy storage module with a lithium battery and a super capacitor as the energy storage unit for the photovoltaic-storage unit integrated machine. Finally, we use the MATLAB/Simulink simulation platform to simulate and verify the effectiveness of our proposed strategy.
Real-time economic and safe operation diagnosis of hydropower units
Authors: Wang Aizhen , Hu Shuxin 
Published: August 2023

Abstract
In order to ensure the safety and economy of the operation of hydropower units under the big data technology application platform and the automatic generation control system, and to tap the maximum power generation potential of the units, an effective method of economic operation evaluation of hydropower units combined with state diagnosis is proposed. Taking Unit 1 of Longtan Hydropower Station as an example, the economic evaluation and status diagnosis of the daily operating conditions are carried out, the real-time efficiency of the turbine is queried through the unit operating conditions data, and the economic operation of the unit is comprehensively evaluated using the standard water consumption index. In addition, the real-time operation condition of the unit shall be diagnosed according to the working condition zoning diagram, and the economic operation condition shall be combined with the unit state operation condition for joint assessment. It is strictly forbidden to operate the unit in the vibration zone and the vortex zone and it is determined that the unit can maximize the power generation efficiency after operating in the safe operation zone.
The modular design and verification of a 110kV circuit breaker
Authors: Su Yi , Pan Shaoming , Zhang Wei , Wang Jialin , Zhang Lei , Meng Ning , Li Weiguo , Gao Xingyu , Gong Ruilei 
Published: August 2023

Abstract
The reliability of circuit breakers is of great importance for the safe operation of the power grid. Most failures of the circuit breakers were caused by their operating mechanism, which often contains a lot of components. What is more, the secondary connections of the circuit breakers are also complicated. The lack of modular design of domestic circuit breakers now limits the development of reconditioning. To improve the reliability and reduce the maintenance time of the circuit breaker, research on the modular design of a 110 kV circuit breaker has been carried out and the verification was also conducted.
The influence of the length of parallel mechanism on path planning
Authors: Li Ji Ze , Yang Tao 
Published: August 2023

Abstract
The path planning of the parallel mechanism should not only consider the motion path of the end effector but also the motion path of the member. As an important factor affecting the workspace of parallel mechanisms, links do not participate in path planning. To realize the intelligence of path planning for parallel mechanisms, a method to determine and modify the feasibility of path planning is proposed based on the parallel 6-DOF attitude adjustment platform. First, the kinematic inverse solution of the motion path of the end effector is carried out to obtain the motion path of the six struts. At the same time, the corresponding workspace is obtained according to the change in the length of the struts, Finally, based on the intersection of the motion path and workspace of the six struts, the success of path planning is determined, and the corresponding path modification method is given. Through the actual experiment and MATLAB simulation, the results show that this method can avoid the motion stop phenomenon caused by a single strut passing through the non-workspace in the path planning of the parallel mechanism.
Verification of the Heat protection and Cooling Effects for Thermal Barrier Coating on Turbine Blade
Authors: Li Shifeng , Zhang Jianqiang , Yang Dengwen , Huang Kang 
Published: August 2023

Abstract
Aiming at the difficulty of directly testing the heat protection effect of thermal barrier coating (TBC) on turbine blades in real working conditions of Aero-engines, in order to obtain the heat protection performance and TBC cooling effect on turbine blades, this study first conducted a simulation test of heat protection effect at 1100K test temperature on a tester, and then combined with the test results of TBC heat protection effect, completed the verification in real working conditions of Aero-engine. The test results verify that the actual heat protection effect of the TBC is roughly equivalent on the suction surface and pressure surface of the blade, but it is the worst in the trailing edge region with the blade basin, with an average relative cooling efficiency of about 0.642 in the middle section, and a maximum absolute heat protection effect of about 41 K. At the same time, the blade has no ablation phenomenon, and the TBC is in good state on the blade surface, and it is free of defects such as cracks, wrinkling, and peeling, as verified by the coupon test with a maximum gas temperature of 1800K for a cumulative period of 21 hours.
Multi-objective rapid optimization method for a variable-stroke valve train device
Authors: Duan Shuhua , Cui Jingchen 
Published: August 2023

Abstract
Raising the maximum valve lift in two-stroke drive mode is the key to increasing the power output of the variable-stroke engine, so the limit design of the variable-stroke valve train device is critical. The multi-objective genetic optimization algorithm NSGA-2 was coupled with the single-freedom dynamics model of the variable-stroke valve train device. A multi-objective rapid optimization program for the valve train device was constructed in Matlab. Two optimization methods explored the maximum valve lift limit in two-stroke drive mode. The first was to optimize the rocker structure, and the second was to optimize the cam position and the rocker structure together. The results show that the single-freedom dynamics model has sufficient computational accuracy. The collaborative optimization results of the cam position-rocker arm structure are more optimal. Under the same maximum lift of the valve, compared to the results of individual optimization of the rocker arm structure, the maximum contact force is reduced by up to 285 N. The maximum contact stress is reduced by up to 63 MPa through collaborative optimization. Compared with the original case, the maximum increase rate of the maximum valve lift obtained through optimizing the rocker structure is 12.45%, while that obtained through collaborative optimization is 12.85%.
The overall structural design of the culverted flyer layout aircraft and the angle-of-view characteristics
Authors: Zhou Zijie , Yang Wenshuo , Xiong Guangchang , Chen Jinhao , Ma Mingyuan , Tang Peng , Zhang Heyi 
Published: August 2023

Abstract
In view of the advantages of both vertical landing and flying wing layout aircraft, the culverted rotor has the advantages of a larger thrust-to-weight ratio and higher net lift efficiency. The culverted rotor is used to achieve a vertical landing. Landing of the aircraft will be an important research direction in the future. This type of aircraft can realize the automatic closing of the upper and lower culvert closing plates when the vertical landing and landing state is changed to the high-speed level flight state. This paper gives a detailed overview of the overall mechanical design of this new culverted wing layout aircraft. Then it analyses that the wing surface aerodynamic characteristics of the culverted wing layout aircraft change abruptly before and after the transition state. This is because the closure of the closing plate achieves a rapid change in the angle of orientation to avoid the degradation of the aircraft’s aerodynamics. The angle of orientation of the wing should be calculated before and after the two states.
Analysis of Influence of Pre-bend Blade Shape on Aeroelastic Characteristics of Wind Turbine Under Startup Condition
Authors: Li Qi , Gao Zhiying 
Published: August 2023

Abstract
In this paper, a 2 MW wind turbine in the laboratory is taken as the research object, and the blades with pre-bending capacities of 2, 3, 4, and 5 m are designed, respectively, to study the influence of different pre-bending capacities on the aerodynamic elasticity of wind turbine under unstable operating conditions. Based on the professional simulation software of wind turbine multi-body dynamics, the parametric model with aero-elastic-control coupling is established, and the simulation calculation of different pre-bending blades is carried out. The results show that the aerodynamic deformation of the blade and the load at the blade root increase obviously with the increase of blade pre-bending. Under the starting condition of a wind turbine, larger blade pre-bending will lead to a significant increase in aerodynamic deformation of wind turbine blades under unstable operating conditions. It shows that the larger blade pre-bending amount will greatly increase the risk of aeroelastic instability of wind turbines under unstable operating conditions.
Study on the Method of Tilt Error Compensation for a Laser On-machine Measurement System
Authors: Zhang Rong , Su Huanhuan , Wei Jialin , Shi Jie , Cui Xiaohang , Yu Junyu , Yao Yonghong , Dong Ying , You Lei , An Nan 
Published: August 2023

Abstract
This paper proposes a spindle vector compensation method based on laser triangulation for the inclination measurement error of a laser on-machine measurement system. By using the fixed relationship between the calibration vector and the spindle vector, the laser’s axis vector and the surface’s normal vector coincide in the actual measurement by adjusting the spindle vector. The tilt measurement and calculation errors are compensated simultaneously using this spindle vector compensation method.
Engine Sonic Load Prediction of Blended Wing Body Aircraft
Authors: Cen Yipeng , Xu Jiaxin , Yang Mingming 
Published: August 2023

Abstract
The sonic load of the engine is the input for cabin noise design and acoustic fatigue verification in civil aircraft. Based on the engine static noise database, an engineering prediction method for blended wing body aircraft engine sonic load in flight is developed. In the process of sonic load prediction, the sound source position correction, geometric diffusion, flight effect and airframe scattering effect of engine component noise are considered. The flight effect and air-frame scattering effect of engine component level noise are simulated and analyzed. The overall sound pressure level distribution and sound load spectrum at typical positions of blended wing body aircraft engine are given. The results show that fan inlet noise is the most important component of the engine sonic load on the BWB aircraft surface, and the maximum value of engine sonic load on the upper surface of blended wing body aircraft is 134 dB, which is higher than that of conventional wing crane aircraft.
The angle of attack and side-slip angle estimation for civil aircraft
Authors: Liu Jun 
Published: August 2023

Abstract
The angle of attack and side-slip angle are two important flight parameters that directly affect the flight safety of civil aircraft. This paper studies the estimation method for the angle of attack and side-slip angle according to air-data system, inertial navigation system, and aircraft aerodynamic data to improve flight safety under the condition of icing, failures, and improper maintenance. Flight tests show that the proposed estimation method is feasible, reliable, and has better accuracy. Furthermore, flight test data analysis shows that the angle of attack estimation error is within 1 degree, and the side-slip angle estimation error is within 1.5 degrees which can meet the requirements of engineering application.
Numerical Investigation of Blade-to-Blade Surface Layout in the Ram-rotor
Authors: Guan Jian , Han Ji’ang 
Published: August 2023

Abstract
A numerical investigation has been conducted on the ram-rotor with various blade-to-blade profiles to achieve potential benefits in enhancing their performance. The blade-to-blade profile is changed by adjusting the strake camber line to enable the formation of expansive and contractive flow paths. Results indicate that the expansive flow path can significantly improve the total pressure ratio of the ram-rotor by altering the position of shock trains. Subsonic airflow after the shock train is decelerated and pressurized, which further contributes to the pressure rising capacity. The leakage flow is suppressed as the flow path is contractive in the blade-to-blade view. This, in turn, leads to a significant reduction of both tip leakage loss and the interference effect between the leakage and the shocks.
A Parameter Correction method of CFD based on the Approximate Bayesian Computation technique
Authors: Zhang Xinfang , Li Miao , Wang Bomin , Li Zexian 
Published: August 2023

Abstract
Numerical simulation and modeling techniques are becoming the primary research tools for aerodynamic analysis and design. However, various uncertainties in physical modeling and numerical simulation seriously affect the credibility of Computational Fluid Dynamics (CFD) simulation results. Therefore, CFD models need to be adjusted and modified with consideration of uncertainties to improve the prediction accuracy and confidence level of CFD numerical simulations. This paper presents a parameter correction method of CFD for aerodynamic analysis by making full use of the advantages of the Approximate Bayesian Computation (ABC) technique in dealing with the analysis and inference of complex statistical models, in which the parameters of turbulence models for CFD are inferenced. The proposed parameter correction method is applied to the aerodynamic prediction of the NACA0012 airfoil. The results show the feasibility and effectiveness of the proposed approach in improving CFD prediction accuracy.
Survey of Noise-Against Techniques for Extracting Stable Skeleton
Authors: Liu Yuan , Ma Jun , Ren Xunhuan , Li Hao 
Published: August 2023

Abstract
Stable skeletons are promising as a compact, concise, and efficient descriptor since they can reflect much critical information about the original object, such as topology, connectivity, etc. However, extracting stable skeletons from images is very challenging since most existing skeleton extraction methods, also named skeletonization methods in some literature, are sensitive to noise, which limits the application of the skeletons in the recognition field. Many denoising methods have been proposed to extract stable skeletons to overcome this problem. However, up to now, there are few review papers to conclude these denoising methods and present their pros and cons. Therefore, In this paper, we survey existing denoising techniques for extracting stable skeletons from images. We first categorize these denoising methods, analyze their core idea, and then present their pros and cons for comparison. In addition, we also offer the potential research direction and possibly challenge.
Dynamic Probabilistic Broadcast based on Neighbour Discovery
Authors: Xiaoying Shuai 
Published: August 2023

AbstractBroadcasting in Ad hoc networks is an important information dissemination way. However, flooding may give rise to broadcast storm problem which causes severe contention, collision and delay. This paper proposes a dynamic probabilistic broadcast algorithm based on neighbour discovery that ensures the higher reliability at lower retransmission. The dynamic probabilistic broadcast algorithm forwards the information from the node (INode) that has obtained it to the node (UNode) that has not received it. By counting the number of UNode and INode of neigbors, INodes dynamically adjust the probability of broadcasting to reduce the number of information replication but cover more UNodes. Dynamic probabilistic algorithm can not only effectively reduce the number of retransmission, but also ensure the effectiveness and reliability. Simulation results show that the number of broadcasting of this algorithm is significantly lower than other algorithms.
Stacking Ensemble Learning for the Modulation Recognition of Underwater Acoustic Communication Signals
Authors: Wang Dezhi , Deng Mengsha , Cheng Xinghua , Bao Changchun , Yin Mei , Gao Kai , Zhao Wenbo 
Published: August 2023

Abstract
Effective detection and recognition of underwater acoustic communication signals is of great significance in the field of ocean exploration. In this paper, a novel deep-learning recognition method of modulation modes of underwater acoustic communication signals is proposed. The stacking ensemble learning framework is established on the basis of several single deep-learning classifiers with different network structures and parameter configurations. The proposed method achieved an average recognition accuracy rate of more than 95% on the dataset generated under a simulation environment. The performance is also verified by means of a comparison with the classic SVM method.