bluuebunny/crossref_metadata_2025_split huggingface dataset:
Performance Study of External Scaffolding under Wind-Induced Action
Authors: Cao Qian , Huang Yiyang , Chen Bo , Wu Pengjin , Zhang Sheng , Ma Liang , Wei Lilong , Huang Lepeng 
Published: March 2023

Abstract
Scaffolding is an essential temporary measure in engineering construction, and its safety management is critical in the construction process. In this paper, the overall scaffolding model is simulated and analyzed by SAP2000 finite element software. The difference in force between the scaffolding under static wind load and time-range wind load is obtained so that the wind vibration coefficient of the scaffolding is suggested. The results show that the most influential factor in the stability of the scaffold is the way in which the wall elements are arranged. At the same time, the most favorable arrangement is a two-step, two-span arrangement of the wall elements, a 50° angle of scissor bracing, and a wind protection factor of 0.8 for the safety net. Also, the wind vibration factor βz should be taken as 2.5 instead of 1 in the scaffolding code for close-meshed scaffolding at a height of 50 m.
Integrated Valve Product Fluid Simulation and Test Verification
Authors: Li Leilei , Liu Baorong , Gong Shengbo , Zhao Jian , Tao Qiang , Zhou Xu , Xu Yingli , Guo Menglei 
Published: March 2023

Abstract
The integrated valve product’s main function is to electrolytic oxygen generation subsystem to produce hydrogen and oxygen to realize automatic discharge, to maintain the space station astronauts in orbit around in comfort and safety, high reliability, easy maintenance, and the device should be easy replacement of human-computer ergonomics requirements to ensure long-term on-orbit operation station. Based on the above requirements, an integrated valve product based on environmental control and a health protection system is designed. The integrated product includes hydrogen normal and backup emission branches, oxygen normal and backup emission branches. Through fluid simulation and experimental verification, it is verified that the flow rate and other key indicators of the integrated valve product meet the requirements, which has certain reference and guiding significance for the design of similar integrated products in the future.
A Control Algorithm of Active Wave Compensation System Based on the Stewart Platform
Authors: Wu Huiyuan , Yang Wenlin , Ong Muk Chen , Fan Tianhui , Yin Guang , Zeng Weixiang , Situa Weilun , Wang Yunting 
Published: March 2023

Abstract
Aim at the actual engineering requirements of wind power operation and maintenance under complex sea conditions, a control method of the active wave compensation system for maintenance ships based on the Stewart platform is presented. The kinematics of the platform is analyzed, and the coordinate transformation, pose, and inverse solutions are analyzed and calculated. The multi-body dynamics simulation model is established by using MATLAB. For the problem of the load nonlinearity and strong coupling of the nonlinear Stewart platform, an active wave compensation active disturbance rejection control (ADRC) is built to attain the high-precision control of the six-degree-of-freedom (6-DOF) Stewart platform. The numerical simulation shows that the proposed control scheme has good tracking accuracy and strong anti-interference ability.
Schwinger-Dyson Equations-of-Motion Method for Quantum Spin-1/2
Authors: Dai Chuanru , Ding Wenxin 
Published: March 2023

Abstract
The essential difficulty of a large portion of the strongly interacting systems can be traced down to the “noncanonicality” of the underlying operators which are used to formulate the theory, like t-J model, Hubbard-type models in the large-U limit, quantum spin, etc. We proposed a new Schwinger-Dyson equations-of-motion method to compute the dynamical correlation functions of quantum spins at zero temperature. This method can also compute all the static observables from the dynamical correlation functions. We propose that this method can formulate dynamical perturbation calculations for quantum spin-1/2 models.
Experimental research on damage tolerance and air tightness of typical composite panels
Authors: Zou Peng , Wang Qingsong , Chen Hao , Yang Junchao , Li YinSong 
Published: March 2023

Abstract
The extensive use of composites in aircraft leads to the problem of damage tolerance after low-speed impact. It is necessary to consider not only the change of mechanical properties but also the change of work properties such as air tightness. In this paper, the damage morphology and air tightness of a typical composite stiffened panel subjected to low-speed impact were experimentally studied. The damage initiation and propagation and the change of air tightness after impact, static compression and compression fatigue were analyzed respectively. It is found from the test that after 120% ultimate load condition and 100,000 times constant amplitude fatigue load condition, the impact damage does not expand, and the air tightness is good and no obvious leakage is observed, indicating that the structural design meets the requirements of damage tolerance and air tightness.
Hot Deformation Behavior of Ni-Modified Graphene/2024 Al Matrix Composites
Authors: Gu Xulong , Liu Fengguo , Kou Ying , Lou Changsheng , Zhang Weiqiang , Lv Xiao 
Published: March 2023

Abstract
The 0.5 wt.% Ni-modified graphene/2024 Al matrix composites were formed by hot compression at the temperature(T) was 300-450 °C, the strain rate(

ε
˙

) was 0.001-1 s−1. The influence of T and

ε
˙

on the flow stress(σ) behavior of the composites was analyzed. Moreover, the metamorphic activation energy of the composites was deduced from the stress-strain data, and the Arrhenius constitutive equation relation of the composites was constructed. According to the dynamic model, the hot processing maps of composites were calculated and analyzed. The Arrhenius constitutive equation of the material is established and the Q is 222.22951 KJ/mol by the peak stress. According to the hot processing maps, the hot instability region of the hot deformation in the experimental parameter interval is determined. Furthermore, the optimal machining interval parameters of the material are proposed to be the

ε
˙

of 0.011-0.368 s−1, the hot working T of 420 - 450 °C.
Numerical Simulation of the Effect of Catalyst on Explosives Detonation Performance
Authors: Wei Dongxu , Wei Li 
Published: March 2023

Abstract
Previous studies on the effect of the blast shock wave are mainly based on experiments. However, due to the extremely short duration of the blast shock, usually within several dozen milliseconds, the blast shock wave will have gone from peak to zero, causing a significant impact on the accuracy of experimental results. In recent years, numerical simulation has become an important method to study the effect of the blast. To study the influence of catalysts on the combustion performance of explosives, this paper intends to study the effect of catalysts on the combustion and explosion performance of pyrotechnic explosives. ANSYS workbench finite element analysis software was used to establish a pyrotechnic-rock blasting model to simulate the different effects produced by different catalysts during the combustion of explosives and compare their blasting effects. It is expected to obtain the preparation technology of higher performance nano-combustion catalysts, good performance nano-combustion catalyst system and its microstructure on the catalytic law of energy-containing materials, and to lay an important theoretical foundation for further development of new varieties of fire explosives with excellent comprehensive performance.
Clay-free biodiesel-based drilling fluid suitable for high temperature
Authors: Shi He , Ni Xiaoxiao , Zhang Jiaqi , Cheng Rongchao , Yan Lili , Wang Jianhua , Liu Rentong , geng Yuan 
Published: March 2023

Abstract
This paper introduces the formation of a clay-free biodiesel-based drilling fluid system. The system uses the biodiesel derived from the transesterification between soybean oil and methanol as the continuous phase, which is environmentally friendly and has an appropriate flow state. In order to inhibit the hydrolysis of the base oil under high temperatures, a small amount of methanol is retained and Lime addition is minimized. Besides, the system also contains a special polyamine-typed rheological modifier instead of organoclay to provide a fragile gel-structure with lower plastic viscosity and higher yield point, thus good for hole cleaning and solid suspension while keeping a higher rate of penetration (ROP). In order to strengthen the plugging and fluid loss control abilities, superfine calcium carbonate and oxidized asphalt are added and obtain a good outcome. Evaluation results showed that the clay-free biodiesel-based drilling fluid exhibits good properties of rheology, filtration, and emulsion stability, with temperature resistance over 200°C, which is suitable for the exploration of unconventional oil/gas restores.
Pulsation Test and Analysis of Internal Gear Pump Used in Electro-hydraulic Actuator
Authors: Tian Yanquan , Zhang Yuqiang , He Jun , Ma Desen 
Published: March 2023

Abstract
The linear conjugate internal gear pump is widely used in the Electro-hydraulic Actuator (EHA) system because of its high efficiency and low noise, especially in the ship domain where vibration and noise requirements are very strict. To find out the reason, the calculation method of flow fluctuation and pressure pulsation at the pump outlet is obtained theoretically. First, the method of obtaining the two characteristic values of pump source flow pulsation Qs and pump source impedance Zs, and the data calculation and processing program are compiled by Matlab. Then the test platform was built, as well as the computer simulation and data collection. According to the theoretical method, the actual flow fluctuation and pressure pulsation at the pump outlet under different working conditions are measured and calculated respectively. The data of each working condition can be summarized and analyzed as: the test platform is reasonable and the data obtained from the test and calculation are reasonable; under the same frequency spectrum, the amplitude corresponding to the fundamental frequency of the motor pump is much larger than that of the pump tooth; under different working conditions, the variation trend of flow fluctuation and pressure pulsation corresponding to the fundamental frequency and the frequency doubling of the internal gear pump is obtained by testing; the specific values are smaller and suitable for the use in a silent system.
Preparation of ZSM-22 zeolite and its application in hydroisomerization dewaxing of lubricating oils
Authors: Dai Jianbing , Wang Junyang , Liu Zhao 
Published: March 2023

Abstract
Hydroisomerization dewaxing is an advantageous process to improve lubricating oil quality. The bifunctional catalyst used in the hydrogenation isomerization reaction provides the isomerization function with the acidic site supported by molecular sieve, and the precious metals such as Pt and Pd provide the hydrogenation function for the metal site, which has the advantages of high activity, low production cost, and mature synthesis process. The ZSM-22 zeolite was hydrothermal synthesized using 1,6-diamino hexane (DAH) as templates in the presence of the seed, XRD, N2 adsorption-desorption and NH3-TPD Cha adsorption-desorption times. Finally, the hydroisomerization dewaxing performance of the Pt/ZSM-22 and Pt-Pd/ZSM-22 bifunctional catalysts were investigated on a high-pressure fixed-bed hydrogenation reactor. The results show that the hydroisomerization dewaxing performance of the Pt-Pd/ZSM-22 catalyst is better.
Preparation of Sm2Zr2O7 Slurry for Thermal Spraying
Authors: Hao Hongrui , Li Yang , Zhang Qingmeng , Song Xiaoyun , Liu Mingkun , Du Yongbo , Deng Hongwei 
Published: March 2023

Abstract
The orthogonal experiment with three factors and three levels was designed to control the process conditions in the thermal spraying process. The solid content, pH value and PVA addition on the stability and fluidity of sm2zr2o7 slurry at different levels were studied. The stability of sm2zr2o7 slurry was characterized by sedimentation experiment, and the fluidity of sm2zr2o7 slurry was detected by rheometer. It was determined that the solid content had the greatest influence on the properties of sm2zr2o7 slurry. The addition of PVA had the least effect. The optimized sm2zr2o7 slurry is as follows: solid content 50%, pH value 7 and PVA addition 4%.
Temperature field analysis and structure redesign of fiber optic gyroscope
Authors: Wang Zishuai , Song Yanming , Chen Lijuan , Zhang Wen 
Published: March 2023

Abstract
Taking the fiber ring of the core device of the fiber optic gyro as the research object, the temperature field simulation analysis of the fiber gyroscope was carried out by ANSYS finite element analysis software, and the structural optimization of the fiber gyroscope was carried out, which effectively improved the temperature field distribution uniformity of the fiber optic ring and reduced the overall thermal equilibrium temperature and time when the fiber gyro reached stability.
Synthesis of Mixed phase TiO2 particles by using the Microfluidic Method
Authors: Wu Zhang , Yanhui Hua 
Published: March 2023

Abstract
Mixed-phase TiO2 finds numerous applications in various fields. Herein, we proposed a controllable approach to synthesize Mixed phase TiO2 particles. The experimental results showed that the particle size of water and titanium dioxide nanoparticles gradually increased with the increased carbon tetrachloride injection rate. The water and titanium dioxide particles transformed into anatase and rutile after calcination. The increase in calcination temperature benefits the formation of a rutile image, and the extension of calcination time benefits the growth process of the rutile phase.
Research of Fault Diagnosis of Mine Rolling Bearing Based on Time-Frequency Analysis
Authors: Li Dong 
Published: March 2023

Abstract
Considering the shortcomings of traditional time-domain and frequency-domain analysis in processing non-stationary signals, this paper proposes to introduce time-frequency into the analysis of a one-dimensional vibration signal and transform it into a two-dimensional time-frequency image to obtain more abundant diagnostic information. At the same time, considering the problem of noise interference under complex working conditions, wavelet denoising is used to preprocess the signal, and the simulation signal is defined. The method of obtaining the time-frequency image verifies the denoising effect. Finally, through the public test data, it is proved that the method can effectively obtain reliable time-frequency images for further bearing fault diagnosis research.
Research on Typical Pipeline Design Method of Power Transmission Auxiliary System based on Vibration Control
Authors: Shu Chenglong , Yan Ming , Wang Chao , Sun Yang , Du Fu , Chen Qidi 
Published: March 2023

Abstract
The power transmission auxiliary system is a set of key systems of armored vehicles, which roughly includes a heat dissipation system, a lubrication system, a compressed air system, a heating system, a thermal smoke screen system, and other subsystems. It is characterized by relying on a pipeline connection so that the auxiliary system and the engine, and the transmission system form a closed loop to achieve functional output. The pipeline of the auxiliary system is mainly arranged around the engine, and the main excitation source is the engine. To improve the reliability of the power transmission auxiliary system of armored vehicles and avoid the phenomenon of running, running, dripping, and leaking, this paper mainly proposes a design method based on vibration control for the typical pipelines commonly used in armored vehicles and determines the excitation frequency of the pipelines mainly at 0~500Hz through testing the excitation source, of which the vibration energy of 150Hz~400Hz is the largest and then attenuated with the analysis of pipeline modalities by hammering test method and finite element method. By simulating the pipeline modality, and analyzing its 1st to 6th-order modes, the pipeline is optimized by changing the pipe diameter, changing the bending radius, increasing the pipeline branch, increasing the flexible link, increasing the constraint, etc., so that the pipeline avoids the resonance frequency in the corresponding mode to obtain the best design scheme of the pipeline. The research method in this paper has been successfully applied to the structural design of the test of the armored vehicle auxiliary system pipeline and other model projects. An effective design process has been formed, and the typical pipeline designed by the method has been completed with prototype trial production, bench test, and real vehicle test. The pipeline work performance is good, and the operation is smooth and reliable.
Study on imperfection sensitivity of vibration behavior in bi-directional FGMs plate
Authors: Chen Xiaochao 
Published: March 2023

Abstract
The sensitivity of vibration characteristics to geometric imperfection in rectangular plates made with FGMs under action of classic or elastic constraints is studied. It is assumed that the material changes in length and width directions of plate. The energy functions of plate are deduced and vibration modals are solved by means of Ritz procedure along with the modified Fourier series. The impacts of geometric imperfection, gradient material and edge conditions on vibration features of rectangular plates are simulated. Numerical results demonstrate that material gradient could be considered as control mechanism for dynamic freatures of plate. Moreover, the existence of geometric imperfections will lead singularity of vibration characteristics of plate. The imperfection sensitivity of vibration behavior in plate may provide important reference in the design or analysis of plates.
Design and Experiment of Ultrasonic Assistant Grinding Device of Spiral Bevel Gear
Authors: Han Jiaying , Mi Bowen , Li Xinrui 
Published: March 2023

Abstract
The precisely ground tooth surface of the spiral bevel gear still shows the thermal crack, and its micromorphology is the cause of high-frequency noise. The ultrasonic assistant grinding (RUAG) technology has the unique advantage of solving these problems. Therefore, this paper designed the split-type rotary device in which the disc grinder and amplitude horn are core components and bolted together. A deformation coefficient was proposed to calculate the strain stress of the disc grinder. Combined with the stepped horn resonant theory, the theoretical model of a multi-step rotating body can be used to calculate the frequency and amplitude of the grinder and horn. The harmonic response simulation was adopted to verify the theoretical results. The experiment proved that the device’s frequency, node, and amplitude are reasonable. The comparison results showed that the simulated frequency and amplitude were closer to the practical one. Moreover, the difference between them increased with the dimension of the device.
Research on Spherical Self-rotating Polishing Technology
Authors: Zhu Tongbo , Cai Fan 
Published: March 2023

Abstract
Polishing technology is widely used in the polishing process of aspheric optical elements, complex curved surface molds, and so on because of its high machining accuracy, good flexibility, and other advantages. Based on the Preston equation, this paper deduces the material removal function of spherical self-rotating polishing by applying the kinematics principle, obtains the removal function with approximate Gaussian distribution by using computer simulation method, conducts processing technology experiments through the spherical self-rotating polishing device, analyzes the influence of polishing pressure and polishing speed on the polishing removal characteristics of ceramic materials by simulation, and verifies the stability of the removal function through experiments. The results show that the removal function graph is Gaussian distribution, which is conducive to the surface shape convergence of airbag machining. The influence of process parameters on material removal rate is in good agreement with the theory and practice and has a good linear relationship. It is a controllable and deterministic processing mode.
Vibration Suppression Technology of Integrated NC Machining of Lightweight Monolithic Panel
Authors: Yang Kai , Zhao Wei , Gao Ming , Feng Changxi , Hu Xingping , Wang Peng , Li Jiaxin , Lai Xiaoming , Gao Liguo 
Published: March 2023

Abstract
The new generation spacecraft module is formed by spinning as a whole, and then the whole module is processed by integrated numerical control. Due to the characteristics of the large diameter and thin wall of the module, it is easy to produce vibration in the processing. In this paper, aiming at the vibration problem of integrated CNC machining cabin body, a method of using reconfigurable fixture internal support to suppress the vibration of weak rigid cabin body overall processing is proposed, and the ANSYS finite element analysis software is used to simulate and analyze the internal support force. The results show that the thickness uniformity of the bottom skin is similar, the dimensional accuracy is higher, and the effect of suppressing cutting chatter is obvious. This paper also improves the design of the milling tool with an unequal helix angle, adds DLC tool coating, and increases the tool rake angle. The simulation results of cutting force based on the FORCE module show that the cutting force is reduced by 31% and chatter in machining is suppressed compared with that before the tool is improved. Through the cycloid milling strategy, the wrap angle between the tool and the workpiece is reduced. It reduces the cutting force, reduces the cutting heat, and ensures the consistency of the product wall thickness and the roughness requirements. The experimental results show that these methods can effectively suppress the vibration in the processing and control the thickness of the integrated numerical control processing panel between 1.47-1.77 mm.
Discussion on the Range Configuration Strategy of Tension Sensor of Icing Monitoring Terminals of High-Voltage Transmission Line
Authors: Li Wenrong , Su Junyuan , Qin Haodong , Yang Yueguang , Huang Junlan 
Published: March 2023

Abstract
Online monitoring of transmission line icing is an important means of anti-icing in the power grid. The accuracy mainly depends on the accuracy of the terminal tension sensor, which is one of the main sources of monitoring errors from large range configuration of tension sensor. This paper analyzes the working principle and characteristics of tension sensors and the load calculation method of different types of insulator hanging points to determine the output error of over-range configuration tension sensors. It finally proposes a principle and a calculation method for tension sensors’ range configuration, which is verified to be reliable by experiments. The results can provide a basis for the selection of tension sensors for icing-monitoring terminals and reduce the error caused by temperature drift and zero drift of tension sensors.