bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comprehensive evaluation of surface parameter correlation in running-in wear process
Authors: Jiang Zhihao , He Ping , Zhang Xinguo , Zhang Gengpei , Liu Fenfen 
Published: September 2023

Abstract
The first wear process is running-in, which is a stage of each machine system must go through. The friction pair’s surface topography is an important feature of the running-in process. After running-in, the surface topography directly affects the performance in stable working state. The wear performance of the contact pair was focused on by mostly existing studies after a time; however, we should consider the correlation of the surface topography before and after running-in. In fact, exploration of this problem is significantly important to extend the service life of machine parts and improve the running performance. Based on the three-dimensional (3D) surface topography parameter evaluation method, in this study, experiments were designed to analyze the effect of the unworn surface topography on that after running-in, and investigated the correlation of 3D surface topography parameters. The results demonstrated that the topography characterization parameters, i.e., Sa, Sq, Sv, Sdc, Str, Sdq, and Sdr under different working conditions maintained a strong autocorrelation (the correlation coefficient of the same parameter). Moreover, the cross-correlation (the correlation coefficient between different parameters) among height parameters (Sq), hybrid parameters (Sdq, Sdr), and functional parameters (Sdc, Sk) was strong. The results of the surface roughness parameters found in this study can be used as input and output feature selection research based on working conditions and surface topography prediction after the modeling research of running-in surface topography.
Thermodynamic analysis of a linear compressor vapour compression system
Authors: Fang Xueliang , Chiong Meng-Choung , Jiang Xinyue , Chen Xinwen 
Published: September 2023

Abstract
Linear compressors are advantageous in terms of miniaturization, high efficiency, and continuous operation without a crank mechanism. The drop-in replacement for R134a in domestic refrigerators is R1234yf. This study aims to investigate the linear compressor thermodynamic performance in vapour compression system with R1234yf by modelling and measuring key parameters such as pressure-volume (P-V) diagram, refrigerant distribution, mass flow rate, volumetric efficiency, cooling capacity, and coefficient of performance (COP). Results show that at 40 °C condenser temperature and 2 pressure ratio, the linear compressor vapour compression system achieved a maximum 299.1 W cooling capacity, which gives 4.12 COP. The thermodynamic analysis calculations are in good agreement to the results of experimental measurements, verifying the accuracy of the model.
Ultra-precision grinding of monocrystalline silicon cylindrical mirror
Authors: Li Jie , Zhou Lian , Ma Houcai , Zhang Qinghua 
Published: September 2023

Abstract
As one of the important functional components in the optical diagnosis system, the processing accuracy of monocrystalline silicon cylindrical mirror directly affects the overall performance of the entire experimental device. In order to obtain high-precision monocrystalline silicon cylindrical optical elements, the coordinate transfer function models of the diamond wheel in the cylindrical surface parallel grinding process were established, and the forming process scheme was proposed based on the wheel dressing precision and element grinding precision. At the end, the experiment for a monocrystalline silicon cylindrical mirror with size of 440mm × 50mm was carried out. The PV value of form error after grinding was about 2.7μm, which proved the correctness of the transfer function and the forming process scheme of monocrystalline silicon cylindrical optical element.
Research on the capacity allocation optimization of micro-grid considering wind-PV-ES
Authors: Yang Mengmeng 
Published: September 2023

Abstract
To achieve the goal of “2030 carbon peak and 2060 carbon neutralization” and optimize the form of multi-energy utilization in the industrial park, it is very important to fully exploit distributed clean energy and micro-grid energy system in the park. In view of the economy of micro-grid investment, the capacity proportion of wind, solar and energy storage is the key point in the planning and design stage. A capacity allocation optimization strategy of micro-grid considering wind/solar/thermal/energy storage is proposed. The model takes the minimum total cost of the system as the objective function. As the characteristics of load in the industrial park has a poor adjust ability, the energy storage is added to the integrated energy allocation system as a flexible adjustable power supply. The energy capacity allocation of micro-grid in a cement plant park in China is analysed and calculated in this paper. The results show that after the completion of wind power, photovoltaic and thermal power, the annual power generation of the project will increase by about 105540 MWh, save about 31000 tons of standard coal per year, and reduce about 84000 tons of carbon dioxide emissions. As the cost of renewable energy will be further reduced under the sustainable development of clean energy and the trend of future technology development, establishing a clean energy micro-grid in the industrial park can bring considerable economic benefits. This study can provide a reference for the capacity allocation of the energy system in the industrial park at the planning stage.
Geometric parameters optimization on storage performance degradation of ultrasonic motor based on simulation analysis
Authors: Tan Bijiao , Wang Hao , Zhang Zhaolin , Huang Shouqing , Peng Haoyuan , Yan Qi 
Published: September 2023

Abstract
The performance of ultrasonic motor will drift due to material degradation and other reasons during long-term storage, which will directly affect the working performance after storage. Aiming at the optimization design of geometric parameters for performance storage degradation, this paper takes the piezoelectric constant d31 of ceramic chip and the elastic modulus of colloid as the characterization parameters of product storage degradation, and takes the stator tooth spacing and the thickness of rubber layer as the analysis objects of product geometric parameters optimization, and proposes a simulation analysis method based on finite element model. Through the analysis of the simulation results, it is found that the increase of the stator tooth spacing will lead to the increase of the change rate of the 5-wave modal frequency with the degradation of the material properties, and the decrease of the overall change rate of the amplitude. However, properly reducing the thickness of the adhesive layer can effectively reduce the influence of the degradation of the piezoelectric properties of the ceramic chip and the hardening of the gel on the frequency response characteristics of the stator of the ultrasonic motor under long-term storage.
Optimal design and verification of the 6-DOF Stewart structure used in vehicle-mounted automatic assembly
Authors: Liu Tong , Lou Huawei , Huang Haitao 
Published: September 2023

Abstract
The Stewart structure with six degrees of freedoms (6-DOF), which has the advantages of big bearing capacity, strong stiffness and high accuracy, has been widely used in the indoor automatic assembly of aeronautics and astronautics. In this paper, a novel design method for the Stewart structure with limited installation space is proposed to extend the workspace by parameter optimization using genetic algorithm, and the performance is further verified via co-simulation. Firstly, the target function, which describes the workspace that satisfies both kinematic and dynamic constraints, is built with four parameters: the joints circle diameters and the angles between adjacent joints of both bottom and top platforms. Subsequently, the genetic algorithm is used to optimize the target function with the four parameters whose bounds are limited by vehicle-mounted installation space and structure interference. Finally, the geometry model is built in LMS. Motion and is studied using co-simulation method with the hydraulic system in AMEsim and control system in Simulink. With the cylinders motion accuracy within ±0.5 mm, the final position of top platform is consistent with the theoretical calculations, and the position error could be controlled within ±0.7 mm.
Research status and development trend of traction robot of coiled tubing
Authors: Zhao Jianguo , Wang Binfan , Chen Bo , Xiao Xiaohua , Wang Guorong , Fang Shiji 
Published: September 2023

Abstract
Coiled tubing (CT) is prone to buckling and locking due to axial friction when extending in large displacement directional wells and horizontal wells. The traction robot of CT can provide axial traction, which can fundamentally address the problem of difficult downward entry of CT. The operation principle, size, traction force, traction speed and other technical indicators of the existing more cutting-edge types of traction robots are analyzed, and the critical structural features of traction robots are summarized. The application prospect of drilling bridge plug technology and drilling technology of the traction robot is put forward. The main points of the research on the traction robot are summarized to provide a concise reference for the future development direction.
Ultra-precision grinding of light-weighted SiC aspheric mirror
Authors: Zhou Lian , Ma Houcai , Zhong Bo , Wang Jian 
Published: September 2023

Abstract
Based on the approximate 3D model of light-weighted SiC aspheric mirror, the deformation and stress at different positions along the radius caused by the grinding force on the mirror surface was analysed. Then the influence of processing parameters on grinding force was experimentally studied, and the prediction model of grinding force was established. Finally, the grinding experiment of light-weighted SiC aspheric mirror was carried out. The PV value of the aspheric surface form error was 4.15μm, and the Ra of surface roughness was about 28nm. The experimental results verified the feasibility of ultra-precision forming of lightweight SiC mirror by controlling grinding force based on process parameters.
A graph optimization approach to range-based relative location
Authors: Li Zhitian , Zhao Nan , Xiong Xingyin , Yang Wuhao , Wang Zheng , Bie Xiaorui , Zou Xudong 
Published: September 2023

Abstract
With the development of multi-robot cluster system, the research of multi-node relative pose estimation is in the ascendant. However, for the environment without GNSS or fixed anchors, the problem of relative pose estimation is still challenging. In this paper, a general algorithm and system framework based on graph optimization algorithm is proposed to fuse inter- and intra-robot measurements, as well as mobility models with sliding windows for relative attitude estimation. In order to verify the feasibility and universality of the algorithm, the algorithm has used to design a relative positioning system based on UWB positioning with a “single-node multi-tags” system structure, which can simultaneously obtain reliable relative positions and directions. The design of multi-source fusion can further improve the accuracy and robustness of relative positioning. Experiment results shows that in the harsh environment without GNSS and fixed anchor points, the relative pose estimation accuracy of this system can reach centi-meter level, which may be the best potential choice for relative positioning of multi robot cluster in complex environment.
Discussion on the static-thermal test technology of aircraft
Authors: Shen Zhiqiang , Xin Qi , Yan Tingfei , Liu Chuang , Lu Dongdong , Zhang Jun 
Published: September 2023

Abstract
During the high-speed flight of the aircraft, the cabin body will bear aerodynamic loads, engine thrust loads, structural and equipment component mass inertial loads. At the same time, aerodynamic thermal loads will be generated due to high speed flight. With the development of hypersonic aircraft technology, the demand for multi-field coupling test is more and more common. Therefore, it is necessary to carry out the technical verification of the mechanics and thermal composite test on the ground to obtain the structural characteristics. In this paper, a certain type of aircraft cabin as the research object, carried out the research on the combined mechanical and thermal test technology. The results of this paper show that the displacement response of the cabin under the combined action of force and thermal load is consistent with the change trend of the force loading curve, and the force load has obvious influence on the displacement response of the cabin. The strain response is consistent with the trend of temperature curve, and thermal load has obvious influence on cabin deformation. Through this study, we can obtain the static-thermal test technology method, and provide the technical basis for the development of similar test technology.
Computational fluid dynamic study on design and modification of underwater remotely operated vehicle
Authors: Mayo Sohaib Arshad , Shi Xindong , Hu Qiao 
Published: September 2023

Abstract
Remotely Operated Vehicle (ROV) has been widely used in numerous underwater exploration applications such as exploration of complex deep sea environment, pipeline detection, installation, maintenance, and repair. Thus, it is worthy to design, optimize, and performance evaluation of ROV systems for underwater exploration purposes. Computational Fluid Dynamic (CFD) is a computational approach that is very helpful and widely used to examine the flow characteristics of ROV systems. In this research work, CFD analyses of ROV bodies with different thruster blades were carried out in order to generate thrust forces by the thruster blades. For this purpose, ANSYS FLUENT was used to examine the flow characteristics over the ROV body. The analyses were performed at different flow velocities, such as 1 m/s, 1.5 m/s, 2 m/s, 2.5 m/s, 3 m/s and 3.5 m/s. The outcomes were in the form of thrust force, drag force, pressure distribution, and velocity distribution. The result shows that four-blade thruster generates maximum thrust force as compare to other ROV thruster models. The main reason behind this higher thrust force is due to the larger motion of the fluid. Similarly, drag force was also investigated and observed that the drag force is greater for thruster model 3, having four blades due to the large frontal area of the ROV body and thruster blades. The results obtained in this study are very helpful for engineers and researchers to design and optimize ROV models using numerical methods.
Enhancing sensitivity in mode-localized tilt sensors based on asymmetrically coupled resonators
Authors: Wang Zheng , Xiong Xingyin , Wang Kunfeng , Yang Wuhao , Bie Xiaorui , Li Zhitian , Zou Xudong 
Published: September 2023

Abstract
Mode-localized tilt sensors with amplitude ratio (AR) outputs have been proven to have a significant improvement in sensitivity over conventional frequency outputs, and the coupling stiffness between the coupled resonators is the key to sensitivity. The resonators in tilt sensors are designed identically to form coupling and have an equivalent response to the external perturbation. This paper proposes a new method to improve the sensitivity without weakening the coupling stiffness between resonators by exploiting the asymmetry of coupled resonators. Using the amplitude ratio of the asymmetrically resonators with a smaller effective mass to the resonator with a larger effective mass as the output, the sensitivity of the mode-localized tilt sensor will be increased approximately by a factor of the ratio of the effective masses of the two resonators compared to symmetrically coupled resonators. Sensitivity can be increased to twice the original using asymmetrically coupled resonators, which has been verified both in theoretical analysis and finite element method (FEM) simulation.
Three-phase Transformer optimization design based on NSGA2 algorithm
Authors: Li Zixing , Zhang Liangxian , Chen Xinfu , Xiao Wei , Li Meng , Shi Baidi 
Published: September 2023

Abstract
To solve the problems of lack of diversity and low quality of solution set in the solving process of traditional transformer optimization algorithm, a multi-objective optimization algorithm based on NSGA-II is proposed. Firstly, a multi-objective optimization model of power transformer winding was established with manufacturing cost, additional coil loss and transformer short-circuit impedance as optimization objectives. Secondly, NSGA-II algorithm was used to optimize the model design. The optimization results showed that, compared with traditional MOPSO, MODE and MOEA. NSGA-II algorithm had better fitness values for each target. Finally, the reliability of the scheme is proved in a 110 kV/63000 kVA prototype, which has better economy compared with the traditional scheme.
Theory and simulation analysis of parallel operation after main transformer replacement
Authors: Wang Ting , Chen Kun , Hu Xinyang , Zhang Longen , Ye Pangqi 
Published: September 2023

Abstract
As one of the most important main equipment in the power system, the safe and stable operation of transformer plays a vital role in ensuring the reliability of power supply. Because the three-phase parameters of the main transformer are not the same, the parameters of each phase and the three-phase load of the power grid are also different, resulting in a certain degree of asymmetry between the three-phase current and voltage of the transformer during normal operation. There will be negative sequence and zero sequence current components. The degree of asymmetry is generally small for the high-voltage power grid, but it has a large impact on the low-voltage side of the main transformer. In this paper, the parameters of two main transformers in a substation are quite different, but when they need to run in parallel, whether they can run in parallel, what are the conditions of parallel operation, these problems have been studied in theory and simulation. The results show that the two main transformers can be operated in parallel under suitable conditions. The actual operation result of a substation’s main transformer is normal, which further verifies the correctness of theoretical calculation and simulation.
PDE modelling and switch strategy controller design for a flexible detection system with output constraint and actuator failure
Authors: Li Fangyong , Cao Fangfei , Huang Shouqing , Wang Hao , Li Wenmiao 
Published: September 2023

Abstract
A novel approach for modelling a mine detection robot system is presented in this paper using partial differential equations and Hamilton’s principle. The system comprises a rigid arm, a detecting sensor module, and a flexible string. The paper addresses the challenges of boundary deflection constraint and actuator fault. To overcome these challenges, a unique controller is developed using Barrier Lyapunov function and switching strategy. This controller enables the robot system to achieve the desired position and eliminate the vibration of flexible string. The superiority of the designed control law is demonstrated through simulation results. Furthermore, the asymptotic stability of the closed-loop flexible system is established by the use of extending LaSalle’s Invariance principle to an infinite dimensional system. This principle ensures that the system will eventually reach a stable state over time.
An infrared stealth spherical target simulation device and its surface temperature control algorithm
Authors: Gao Xiaohui , Feng Zhipeng , Tong Saisai , Liu Yongguang 
Published: September 2023

Abstract
This paper presents a simulation device for infrared stealth spherical target and a feedforward temperature compensation algorithm for its surface temperature. A three-dimensional model and a mathematical model based on heat transfer equation are established. Experimental data from three different spherical targets is used to calculate feedforward compensation and obtain a detailed control law. Experiments verify the reliability of the mathematical model and the accuracy of the temperature control algorithm. The algorithm can control the surface temperature of the spherical target within ±2 °C and has good system dynamic characteristics.
Sequence optimization for MRI acoustic noise reduction
Authors: Wang Yulin , Xu Pengfei , Zeng Jie , Zhang Jichang , Zhu Yuliang , Che Shao , Yao Chendie , Ge Yuwei , Wang Chengbo 
Published: September 2023

Abstract
The large acoustic noise of 80-110 dB during magnetic resonance imaging (MRI) scanning harms patients’ comfort and health. The noise can be reduced by hardware modification or active noise control, but these methods are expensive, difficult, or not very effective. In this study, a sequence optimization method is used to mitigate the acoustic noise problem while maintaining image quality. The 4th order polynomial function is applied to design the new quiet pulse sequences, decreasing the gradient slew rate and higher time derivatives of the original trapezoidal lobes. A sound pressure level (SPL) estimation method is proposed to predict the acoustic noise loudness from the gradient and is used for genetic algorithm sequence optimization. The original and quiet gradient recalled echo (GRE) sequences are applied on a 1.5 T MRI scanner. The average SPL is reduced by 18.6 dBA, and the images show small differences and have similar SNR values. This method is also applied for the scouting and shimming GRE sequences in common clinical applications with significant noise reduction.
Line loss calculation model of low-voltage distribution network under harmonic and three-phase unbalance disturbances and its experimental validation
Authors: Li Xinpeng , Wang Guo , Li Yongshun 
Published: September 2023

Abstract
With the grid integration of distributed power sources and traction loads, the power quality problem of the power system has become more and more serious, aggravating the distribution network line losses, so it is important to study the calculation model of distribution network line loss under power quality disturbance in order to find loss reduction measures. This paper first theoretically derives the calculation model of line loss of low-voltage distribution network under separate disturbance of 2 common power quality problems, namely, harmonics and three-phase unbalance. Then, using the composite power quality disturbance decoupling method, the calculation model of line loss of low-voltage distribution network under the disturbance of harmonics and three-phase unbalance is derived, which improves the accuracy of line loss calculations. Finally, experiments are conducted for each part by Matlab/Simulink simulation tool to verify the correctness of the theoretical derivation.
Current stress optimization control of isolated AC-DC matrix converter
Authors: Deng Wenlang , Wang Chun , Geng Zhenjia 
Published: September 2023

Abstract
The Isolated AC/DC matrix converter realizes bi-directional energy transmission through phase shift control. The existing control schemes do not coordinate the modulation coefficient and phase shift ratio well, which will cause large current stress to the converter, resulting in low efficiency. To solve this problem, this paper analyses the working mechanism of IAMC under dual phase shift control. It constructs a mathematical model under dual phase shift control to calculate the current stress. An optimal control method for the current stress of isolated AC/DC matrix converter is proposed. The current stress is suppressed by coordinating modulation coefficient and internal and external phase shift ratio. Finally, a simulation platform is built to verify the proposed method.