bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of the Spiral Angle of the Blade on the Material Loading Characteristics of the Slurry Pump
Authors: Chen Zhuyang , Yan Fei
Published: March 2023

To study the effect of rotational speed on the internal flow characteristics and operating performance of a deep-sea mining slurry pump, a new type of slurry pump delivery system with changing vane helix angle is adopted in this paper. Based on the coupled computational fluid dynamics-discrete element method (CFD-DEM), the realizable k-ɛturbulence model and SIMPLE algorithm are applied to numerically simulate the solid-liquid two-phase flow field in the slurry pump to study the effect of rotational speed on the flow characteristics and distribution of particles in the slurry pump. The results show that with the increase in rotational speed, the separation of the boundary layer at the impeller runner is promoted, which weakens the particle overflow capacity and increases the hydraulic loss. The impact at the inlet of the guide vane runner is more violent. The fluid flow separation at the inlet is suppressed. The overflow capacity is increased and the hydraulic loss is weakened. With the increase in rotational speed, the more the average number of collisions between particles and vanes in each time period, the more the particles collide with the impeller and space. The collision probability and collision speed of the guide vane overflow parts become larger, thus laterally reflecting that the larger the rotational speed, the greater the wear rate of particles on the blade is.
Dynamic Response Analysis of Suspended Tunnel under Wave-current Combined Action
Authors: Yan Songsong , Dou Peilin , Jing Baojin , Zhang Xiaoliu
Published: March 2023

The environment in the ocean is complex, and waves and currents produce complex coupling effects on the structures in the ocean. The flow-solid coupling theory and calculation method are applied to establish a three-dimensional model to study the changes in the flow field under the joint action of waves and currents through the comparative analysis of water velocity at the upper and lower near-wall surfaces of the suspension tunnel tube body. The dynamic response of the tension-leg suspension tunnel is calculated using unidirectional fluid-structure coupling. The relationship between different wave heights, different anchor angles, different flow velocities, and different depths and the deformation of the suspension tunnel in the presence of waves is investigated. The results show that the wave height and velocity have a great influence on the floating tunnel, and the displacement changes in both horizontal and vertical directions are large. With the increase of construction depth, the influence of waves on the floating tunnel becomes smaller. When the angle of the anchor cable is changed, the horizontal direction and the vertical direction change in opposite laws, so it is very important to select a suitable angle for the anchor cable. The research results provide a reference for the design of similar floating tunnels.
Directivity of spherical acoustic scattering based on COMSOL
Authors: Sun Xiaofang , Zhang Shisong , Yao Zhongshan
Published: March 2023

The acoustic scattering characteristics of spheres are the basis for studying the sound scattering law of the target. The directivity of acoustic scattering is one of the most important characteristics of the target sound scattering law. In this paper, the acoustic scattering characteristics of rigid spheres and elastic spherical shells are analyzed from the two typical basic models of the rigid sphere and elastic spherical shell. The sound scattering directivity corresponding to different ka values under different models is analyzed by COMSOL finite element simulation analysis. The change law of spheroid scattering directivity of spheres under different elastic backgrounds of the rigid sphere and elastic spherical shell is compared and studied. It is found that the scattering directivity of both rigid spheres and elastic spherical shells will change with the change of ka value. The larger the ka, the stronger the forward directivity, and the more side lobes for rigid spheres. The backward directivity is greater than the forward directivity at ka≤1, while the forward directivity of the elastic spherical shell is always greater than the backward direction. And it is not difficult to find that the directivity of rigid spheres is relatively uniform in backward scattering when ka=1. When ka>1, the directivity increases with ka, the forward directivity becomes stronger and stronger, and the side lobes gradually increase. The elastic spherical shell uses air as the internal filler, and its directivity has always been forward than backward. The forward directivity also increases with the increase of ka, and the side lobes also increase with the increase of frequency.
Tubing Depth Optimization Study of Horizontal Well Drainage and Gas Production in WeiYuan Shale Gas Field
Authors: Che Mingguang , Liu Jie , Bu Chengzhong , Dong Kai
Published: March 2023

Timely production with a tube in shale gas wells can effectively ensure the stable decline of gas wells. However, there is no in-depth study on which position of tubing is the most favorable for the stable production of gas wells and whether the wellbore trajectory has an impact on this position. To determine the reasonable end of tubing (EOT), firstly, through the gas water flow experiment of the whole wellbore test device of a horizontal well, the characteristics of liquid accumulation in the test section and the liquid discharge at the outlet are analyzed. The results show, when the horizontal section inclines upward and the end of the tubing reaches 1/3 of the horizontal section, the gas flow carrying liquid is the smallest. Then, OLGA software is used to simulate the wellbore effusion in the production process of gas wells with different tubing depths under different wellbore trajectories. The results show when the horizontal section inclines upward and the end of the tubing arrives at 1/3 of the horizontal section, the cumulative production of the gas well is the largest. Based on comprehensive analysis, it is most favorable for horizontal shale gas wells when the end of the tubing is about 1/3 of the horizontal section.
Advances of asphalt pavement runoff models
Authors: Wang Zhenlong , Wang Xiao , Ni Dong , Shao She-gang
Published: March 2023

It is of great significance to study the formation mechanism of pavement runoff for pavement drainage optimization and traffic safety. Based on the research achievements of pavement runoff at home and abroad, this paper summarizes the existing runoff models into three types: empirical model, theoretical model and hydrodynamic model, and the theories and methods of the above models are introduced and analyzed in detail. The hydrodynamic model allows for the pavement attributes and achieves a dynamic simulation of runoff hydraulic parameters. It effectively overcomes the disadvantages of the dependence of basic data by empirical model and the complicated solution by theoretical model and provides a more accurate method for studying the mechanism of runoff generation and flow concentration on asphalt pavement.
Broadband measurement method for acoustic performance parameters of large sample materials
Authors: Shi Shang , Lyu Shijin
Published: March 2023

In order to measure the acoustic performance parameters of large sample acoustic materials under water and eliminate the influence of wall reflection in limited space, the principle of inverse filtering and transfer function method is used to establish a wide frequency transfer function method for underwater materials under the vertical incidence of sound waves. The acoustic performance test of the 10mm uniform steel plate model shows that the broadband transfer function method is used to improve the measurement, and in the frequency band above 500Hz, the reflection coefficient test deviation is less than 0.1, and the sound insulation test deviation is less than 2dB. Effectively reduced the test limit of the broadband pulse method for underwater measurements.
Motion Response of Floating Platform Hoisting Impeller Based on Fully Coupled Model
Authors: Shi Xinghua , Zhang Wei , Ben Qingqing , Zhang Jing
Published: March 2023

Given the construction efficiency and operation safety of offshore wind turbine hoisting, it is necessary to study the motion response characteristics of a floating platform-hoist coupling system. Using SESAM hydrodynamic calculation software, a fully coupled model of a floating crane ship and fan impeller is established. The accuracy of the calculation model is verified by comparing the numerical simulation results with the pool experimental results. Based on this research, the sensitivity factors of floating crane ship motion are analyzed. The results show that the floating crane should choose the bow-top wave operation to minimize the rolling motion of the hull. The wind speed and the elevation angle of the boom have a great influence on the motion of the floating crane. The larger the wind speed, the greater the motion response of the hull, the smaller the elevation angle of the boom, and the larger the roll value of the hull. The higher the impeller height, the greater the motion displacement of the floating crane, but the influence is different on the hull motion under different working conditions. The results of the simulation analysis can provide a reference and basis for offshore wind turbine hoisting.
Effects of Welding Speeds on Microstructures and Properties of a CoCrNiSi0.2 Medium Entropy Alloy in Electron Beam Weld Joints
Authors: Zhang Li , Li Yuxin , Li Mei
Published: March 2023

As an excellent welding technique, the electron beam welding technology may easily melt certain refractory metals by the high energy generated during the electron beam welding process, thus obtaining well-formed joints with a large depth of fusion and small deformation. The technology has been applied to weld high- or medium-entropy alloys, and obviously improved performances of joints. In this study, the electron beam welding technology was used to weld a medium-entropy CoCrNiSi0.2 alloy. Microstructures of the weld joints and its quasi-static mechanical properties affected by changing the welding speeds were also studied. The research showed no obvious HAZ in the CoCrNiSi0.2 medium entropy alloy, and the weld zone and base metal present a single FCC phase. Furthermore, grain refinement occurs in the weld zone, and the hardness test shows that the hardness of weld zones are generally higher than that of the base metals correspondingly. In contrast to specimens at other welding speeds, the weld joints possess a higher hardness and a maximum tensile strength at 360 mm·min−1, a higher yield strength of the weld joints occured at 720 mm·min−1, and the fracture presents a form of ductile fracture.
The Study on Long-term Rutting Resistance of Compound Hot In-place Recycled Asphalt Mixture Based on MLS11
Authors: Zhou Qiwei , Zhu Huayang , Zhao Mengzhen , Wei Jifen , Wang ZHimei
Published: March 2023

In order to evaluate the long-term rutting resistance performance of recycled geothermal asphalt mixture, the accelerated loading test of long-term rutting resistance performance of recycled geothermal asphalt mixture was carried out by MLS11 (1/3 ratio accelerated loading equipment) under the environment of high temperature 60°C drying and high temperature 60°C water immersion, and was compared with the newly mixed AC-13 asphalt mixture. The test results show that, after loading 1 million times, the rutting depth of recycled asphalt mixture is 5.34mm and 4.87mm respectively, which is 0.68 times and 0.62 times of that of fresh asphalt mixture, and the rutting creep slope is 0.023mm/ 10,000 times and 0.026mm/ 10,000 times. The rutting depth of the recycled asphalt mixture was 4.22mm and 3.78mm, respectively, 0.76 times and 0.68 times of that of the fresh asphalt mixture, and the creep slope of the rutting was 0.024mm/ 10,000 times and 0.023mm/ 10,000 times. The coarse ore material gradation (small critical sieve pass rate) of the recycled asphalt mixture had the best long-term rutting resistance. In the high temperature 60°C water immersion environment, the edge deformation of the recycled asphalt mixture is 1.3 times and 1.1 times of that of the new asphalt mixture, and the long-term rutting resistance of the recycled asphalt mixture is more affected by the coupling effect of water temperature than that of the new asphalt mixture.
Research on the Microstructure of Laser Remelted As-sprayed TiB2-TiC0.3N0.7 based Composite Coating
Authors: Liu Caiyan , Mao Zhengping
Published: March 2023

Ceramic coatings with excellent properties of wear resistance, corrosion resistance, oxidation resistance, stability in acid and alkaline environments, and good bond strength with a metallic substrate, are widely used in different industries. Air plasma spraying has high energy and efficiency for depositing ceramic materials with a high melting point. Due to intrinsic porosity and mechanical bond strength between coating and substrate, laser remelting technology can be applied to the coating surface for improving coating properties. As-sprayed TiB2-TiC0.3N0.7-based composite coating was surface remelted by laser. The surface roughness of as-sprayed and laser-remelted coatings was measured. The phase composition and the microstructure as well as the Vickers microhardness of coatings were studied by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and Vickers indentation instrument. It is found that the phase composition does not change after laser remelting. However, the surface roughness of laser-remelted coating is smoother than that of as-sprayed coating. And the microhardness on the cross-section is increased after laser remelting. There is a micro-crack in the laser-remelted coating due to the fast heating and cooling of the laser. The microhardness of the laser-remelted coating is increased with bimodal Weibull distribution.
A review of solid-state halide electrolyte matched LiCoO2 and Ni-rich NCM
Authors: Wang Jing , Lu Shigang , Wang Lijun
Published: March 2023

The energy issue is an important issue affecting the development of countries worldwide. To solve the problem of resource depletion faced by fossil energy, to cope with global warming, and to achieve sustainable development, the development, utilization, and promotion of new energy sources have received universal attention. Halide solid electrolytes have a stable oxidation potential above 4 V, matching the LiCoO2 cathode material with considerable electrochemical performance. This review addresses the electrochemical performance and possible problems matching solid-state halide electrolytes with LiCoO2 and Ni-rich NCM. This paper concludes that halides have electrochemical stability and high ionic conductivity at high potentials matching LiCoO2 and Ni-rich NCM and good electrochemical properties. However, whether surface reactions exist when it is matched to a high nickel ternary material with a high surface base content, the evolution of the interface between the high nickel ternary material and the halide electrolyte during cycling and the factors affecting the performance of Ni-rich NCM in halide solid-state batteries need to be further investigated.
Properties of AB5 type hydrogen storage alloy after α-AlH3 alloying
Authors: Ding Nan , Liang Fei , Liu Wanqiang , Wang Qingshuang , Cheng Yong , Wang Limin
Published: March 2023

AB5 type hydrogen storage alloys have been widely used in Ni-MH batteries due to their high electrochemical capacity, excellent rate performance, and low pollution. However, the high activation difficulty limited their development in the solid-state hydrogen storage field. Mechanical alloying to synthesize composites is an effective way to reduce activation energy. In this paper, the structure and hydrogen storage properties of the LaNi5+nAlH3 (n = 0, 1, 3 wt.%) composites were investigated. The results show that with the incremental of AlH3 alloying content, the lattice constant a, b, and c and the volume (V) of the LaNi5 unit cell tend to increase, the hydrogen absorption platform pressure of the composite material gradually decreased, and the hydrogen release platform pressure gradually increased. It resulted in a reduction in the hysteresis factor (Hf) of the composite from 0.66 to 0.35. This will reduce energy waste during energy conversion. In addition, the activation property of the alloy was improved after AlH3 alloying. This will facilitate the application of AB5 type hydrogen storage alloys.
Homogenization treatment and heat deformation behavior of cast ZK60 magnesium alloy
Authors: Liang Haicheng , Dong Ziming , Zhang Yupeng , Bai Yuhong
Published: March 2023

The casting ZK60 magnesium alloy was homogenized by different methods, and the best homogenization method was determined by observing the metallography. The stress and strain curves of casting ZK60 magnesium alloy after homogenization were obtained by hot a compression experiment. The thermal processing map of peak stress was drawn by the stress-strain curve, and by the analysis of the thermal processing map could distinguish the processing instability zone and safe zone of the casting ZK60 magnesium alloy.
The analysis of the jump ring on the surface of a thin wall copper tube by drawing with a floating plug
Authors: Liu Jinsong , Zheng Jiayi , Chen Dayong
Published: March 2023

The defect of the jump ring on the surface of the thin wall copper tube by drawing with a floating plug was analyzed, experiment was based on a direct reading spectrometer, metallographic microscope, SEM, and 3D surface topography instrument. Research shows that: when the plug position was over the extreme for-most position, the copper tube was extruded between the drawing die and mandrel, forming a localized necking state; when the plug position was over the extreme rear-most position, the copper tube was drawing in the empty sinking state. The plug does not play a finishing affection, which causes local projections of surface materials. The jump ring macro showed a ring bamboo section scar with bright and dark, micro performance for the uneven wall thickness.
Simulation and analysis of AZ80 magnesium alloy centrifugal casting
Authors: Liang Haicheng , Kang Jianming , Zhao Dazhi , Le Qichi , Liu Tianze
Published: March 2023

Centrifugal casting magnesium alloy pipe has been widely used. Still, because of its poor mechanical properties, it isn’t to meet the needs of the working environment, which limits its development in civil and industrial fields. Therefore, it is necessary to study the centrifugal casting process of magnesium alloy. In this paper, AZ80 magnesium alloy is used as the research material, and the numerical simulation of the centrifugal casting process is carried out by ANSYS Fluent software. The influence of different variable conditions on the solidification rate is analyzed, and a concept of defect ratio is proposed. The post-processing software is used to write an expression for macroscopic analysis of pore defect ratio on the outer surface of the casting, using which the influence of defect ratio under different variables is given. The research aims to guide the centrifugal casting experiment and predict the defects, greatly saving resources and costs.
Study on Mechanism of Titanium Slag Smelting in DC electric Arc Furnace
Authors: Huang Shihong , Long XianHao , Cui Yan , Zhang Liang
Published: March 2023

Based on the production practice of a 30MWA large DC electric furnace in Yunnan, this paper discusses the basic reactions in smelting titanium slag, and discusses the thermodynamic and kinetic behaviors of the main elements and impurities. The results show that the reduction reaction in the smelting process is carried out simultaneously in the multi-component system of Al2O3-CaO-MgO-SiO2-TiO2. The titanium slag containing more than 80% TiO2 can be obtained by enrichment smelting of ilmenite in a large high-power enclosed direct current electric arc furnace, and the output includes by-product pig iron. Impurities MgO, CaO and Al2O3 in titanium concentrate will not be reduced during reduction smelting; SiO2, MnO and V2O5 will be reduced in varying degrees, and the reduced products Si, Mn and V will dissolve in the metal Fe phase or be enriched in titanium slag.
Manufacturing of Mold Cavity of Micro-double Gear by WEDM
Authors: Li Wenming , Zhao Lei , Wang Gang , Zhou Changwu
Published: March 2023

Micro-double gear is an important component that transmits power or motion as one of the key components of micro-device. In order to realize the mass and industrial production of micro-double gear, an injection mold of micro-double gear was designed. The single factor experiment and orthogonal experiment were used to optimize the process parameters of wire cut electrical discharge machining (WEDM) for machining micro-double gear mold cavity insert at the maximum cutting speed. The results show that the influence of process parameters on cutting speed is successively N, Toff
and Ton
, and N has the most significant influence on cutting speed, which is the key factor. When Ton
=8µs, Toff
=3Ton
and N=5, the maximum cutting speed is 99.24mm2/min. The combination parameters of the maximum cutting speed were used to process the cavity insert of micro-double gear mold, and the cavity of micro-double gear mold was better fabricated.
Design and Optimization Key Structure of Planting Machine for Rock Wool Block Seedlings
Authors: Zhai Shaoyu , Ding Tao , Gao Guohua
Published: March 2023

Aiming at the problems of poor automation and low efficiency in tomato planting, this paper designed a fully automatic rock wool seedling planting machine. We designed the machine’s overall structure according to the agronomic requirements of tomatoes and the actual site. In addition, according to the uncertainty of contact between the rock wool block (RWB) and soil matrix, the corresponding motion behavior model after collision contact was established to predict the motion of RWB. The parameterized modeling of the soil matrix was carried out, and then a structure with an adaptive function was added to the original machine for optimization. The machine was processed, manufactured, and tested. The success rate of colonization was 99.4%, and the efficiency was 1500 per hour. The study can provide a reference for the automatic tomato planting machine design.
Flare folding wing tips for static and gust loads alleviation
Authors: Ye Bo , Yang Youxu , Cheng Zhiyong
Published: March 2023

The Passive gust load alleviation device can effectively simplify the control system by relying on the adaptive deformation of the structure. This research examines the influence of using folding wingtips during flight as a means of reducing static loads and gusty loads. Effects of hinge direction, wing-tip weight, stiffness and wing-tip centre of gravity on static and gust alleviation performance has been examined. The results show that the flare folding wing-tip can significantly reduce the static load and gust load of the aircraft. In a static aeroelastic trim analysis, a folding wingtip can increase span by 25% without increasing the wing root bending moment and decrease the trim angle of attack by 0.14°. In the gust response analysis, the maximum bending moment of wing root can be decrease by nearly 50% compared with the fixed wing-tip, only 17% higher than the baseline model without a wing-tip.
Design of Plc-based Pipe Pile Residual Slurry Recovery Equipment Control System
Authors: Zhao Heng , Zhang Lihua , Chen Kai , Chen Jingming
Published: March 2023

To solve the cost loss caused by the low recovery efficiency of pipe pile residual slurry, as well as the pollution of the environment during discharge, a control system of pipe pile residual slurry recovery equipment is designed. The equipment is controlled by PLC (Programmable Logic Controller), aiming at the problem that the traditional PID (Proportion Integration Differentiation) cannot modify the parameters in real time to meet the accuracy requirements of the residual slurry density. The fuzzy PID controller algorithm is proposed, and the simulation analysis is carried out by MATLAB at the same time. Through PLC selection, PLC I/O allocation, electronic control system design, program writing, and HMI (Human Machine Interface) establishment, the information interaction is achieved between equipment and people while monitoring the production process. Through on-site production tests, the equipment is proved to be reliable and efficient, which can make the residual slurry recovery utilization rate reach more than 90%, and reduce the production cost of pipe piles.
Vibration characteristics of gear system with a cracked-gear tooth: modeling and experiments
Authors: Zhao Songtao , Ma Hui , Jiang Yuting , Wang Yaping , Fu Kunkun
Published: March 2023

Gear tooth crack failure is a cruel problem in the gear transmission system. The research on the simulation and experiment is the hotpots in the field. The theoretical and experimental investigations on the vibration characteristics of a gear system with a cracked gear tooth are carried out in this study. A finite element (FE) model is built to predict the crack propagation path in a gear tooth and determine the time-varying mesh stiffness (TVMS) of gear pairs. A dynamic model of the gear system is developed using the lumped-mass model. The established models are validated by comparing the computing results with experimental ones. The influences of crack length on TVMS and vibration characteristics of the gear system are analyzed in detail. The proposed methods can provide useful guidance for fault diagnosis and dynamic performance evolution prediction of a gear system.
Reliability Analysis of Diesel Engine Connecting Rod Threaded Connection Based on ANSYS
Authors: Hu Fengyan , He Qiang , Fu Bofeng , Zhao Ming , Yang Ming
Published: March 2023

Connecting rod bolt is the key component of the diesel engine crank connecting rod mechanism, and the phenomenon of stress concentration at the thread easily occurs in the working process of the crank connecting rod, due to the characteristics of the threaded connection. In order to improve the quality of the threaded connection of the diesel engine connecting rod, the connecting rod’s big end threaded connection structure is numerically simulated based on ANSYS finite element analysis software through the combination of theoretical analysis and numerical simulation. The stress distribution of different pitches, threaded connection length and bolt preload are analyzed, and the effects of different factors on the strength of threaded connection structure are obtained. The research results have important engineering application value for improving the reliability of the threaded connection and ensuring the safe operation of the diesel engine connecting rod mechanism.
Analysis of Plane Displacement of Pressure Vessels with Defects
Authors: Feng Xiu , Bao Shuo
Published: March 2023

Aiming at the problem that the internal defects of the pressure vessel are not easy to detect, the out-of-plane displacement method is used to study it. The out-of-plane displacement field of circular flat plate heads with defects is obtained by the method of elastic theory analysis and compared with the finite element method to verify the accuracy of the finite element method. Based on the finite element method, the effects of vessel material, pressure load, defect shape, and defect size on the first-order out-of-plane displacement derivative are studied. The results show that the material of the container has little effect on the out-of-plane displacement. The first derivative of out-of-plane displacement increases linearly with the increase of pressure, and this relationship will not change with the increase of pressure. With the increase of defect aspect ratio, the maximum value of the first derivative of out-of-plane displacement increases gradually. When δ ˃ 9, the defect is detectable. The research results lay a theoretical foundation for the internal defect detection of pressure vessels based on digital speckle shearing interferometry.
Design and optimization of a permanent magnet crawler for a marine wall-cleaning robot
Authors: Feng Yuyong , Guan Dianzhu , Deng Haoyun , Wang Xianhui , Song Xincheng
Published: March 2023

At present, ship wall cleaning is important in the marine engineering equipment maintenance industry. Designing permanent magnetic adsorption units is one of the most important ways to implement efficient, environmentally friendly, high-quality ship cleaning work. In this paper, theoretical design tests and technical studies are carried out on the permanent magnetic crawler structure of the ship cleaning and wall climbing robot, and the adsorption method, walking method, magnetic material and permanent magnetic adsorption structure of the ship cleaning and wall climbing robot are comprehensively analyzed and selected. Finally, the design of the permanent magnetic crawler for the ship cleaning and wall climbing robot is proposed.
Research on the Braking Control Strategy of Automobile Driven Independently by Front and Rear Dual Motors
Authors: Du Xiaofang , Li Shiqing
Published: March 2023

Regenerative braking is one of the most important methods to solve the difficulty of energy loss in city driving. The dual-motor pure electric vehicle is considered to be the object of study with the goal of energy utilization of the reproductive system of braking. The PSO (particle swarm optimization) algorithm is adopted to solve the problems under these constraints of ECE-R13 braking regulations and I-curve. The results of the simulation indicate that compared to the conventional braking tactic of AVL CRUISE, the energy renewal effect of the steering strategy is raised by almost 19.24% and the driving distance is increased by as much as 23.8%.
Static analysis and optimization design of a special-shaped rod of the crab-like robot based on ANSYS Workbench
Authors: Yang Xiaolong , Zhang Chaogang , Zhou Le
Published: March 2023

This paper takes a self-designed crab-like robot special-shaped rod as the research object. To solve the problem that the actual gait does not conform to the theory encountered in the debugging stage, the following operations are carried out: after static analysis, the problem is that the special-shaped rod is complex and stressed. It is complicated, and the resulting deformation is too large, resulting in a decrease in the movement stability of the overall mechanism. To improve the stability of the mechanism, SolidWorks was used to complete the construction of the crab-like robot model, and ANSYS Workbench was used to perform static analysis and topology optimization on the special-shaped rod, so as to obtain the preliminary optimization results. On this basis, to better improve the stability of the mechanism, the secondary optimization of the special-shaped rod is carried out. The static analysis is carried out again and the obtained results are compared with the original design. The deformation of the special-shaped rod during the movement process is reduced by 13%. Under the premise of structural rigidity, the weight is reduced by 44. 73% and the stress distribution is more uniform. The above analysis results show that after the analysis and processing of the above methods, the special-shaped rod structure is further optimized, the stability of the overall structure is improved, and the effect of green design is achieved at the same time.
Research on flexible stabilization strategy for power fluctuation characteristics of Distributed Renewable Energy cluster
Authors: Deng Ruiqi , Chen Gang , Li Bo , Wu Jianping , Guo Liang , Liu Junting
Published: March 2023

To fully use the flexible regulation resources of the grid to solve the fluctuation smoothing problem of massive distributed renewable energy clusters(DREC) power generation in the grid, a flexible smoothing method is proposed for the fluctuation characteristics of DREC. Firstly, the method of adaptive gaussian filtering strips out the power for DREC that meets the grid entry criteria and obtains the power generation that needs to be smoothed out; secondly, according to the proposed fluctuation characteristic evaluation index, quantitative analysis and grade evaluation are performed on the stripped power generation that needs to be smoothed out, and the corresponding flexible smoothing strategies are adopted according to the fluctuation grade. Then, corresponding strategies adopt the flexible regulation resources to realize the flexible stabilization effect of DREC. Finally, a simulation analysis is conducted to verify the feasibility and effectiveness of the method by using the power generation data of photovoltaic power plants in a region on typical days.
Fault Identification of Secondary Equipment in the Intelligent Substation
Authors: Huang Jiayin , Zhang Chi , Ding Xiaobing , Peng Ye , Gao Honghui , Gao Zhanjun , Liu Zhao
Published: March 2023

With the continuous expansion of the scale of the power system and the increasingly complex structure, the intelligent construction of the power grid continues to deepen and the construction scale of smart substations as the core part of the smart grid is also expanding. At present, higher requirements are put forward for the operation and maintenance of the secondary system of the smart substation. Therefore, the fault diagnosis of the secondary system of smart substations has become an important research direction for smart grid construction. This paper proposes a secondary system fault location method for smart substations. The method uses a search algorithm based on an adjacency list and skyline query to determine the fault area. This scheme is applicable when the fault information is complete or not. Compared with the method of using the neural network to directly locate the fault of the whole network components, the training scale of the neural network is reduced and the “uncritical” feature quantity is reduced for the fault location. It highlights the value of “key” feature quantities and effectively improves the accuracy of the fault location.
Metro Electric Traction Load Forecasting Based on Prophet-GRU Hybrid Model
Authors: Li Rui , Du Jiao , Zhang Xiangying
Published: March 2023

In order to further improve the metro electric traction load forecasting and provide support for energy conservation and sustainable development of urban rail transit. In this paper, a Prophet-GRU hybrid model based on weight selection is proposed. This model combines the advantages of Prophet and GRU, takes account of timing characteristics and influence factors synthetically, and improves the accuracy of electric traction load prediction. This paper first introduces the background of electric metro traction load and the model used in this paper and then proposes electric traction load forecasting based on the Prophet-GRU hybrid model. Taking a subway line as an example, firstly, the Prophet and GRU are used for prediction respectively, and then the error reciprocal method is used to combine the two models to obtain the final forecasting result. Compared with the single Prophet and GRU, it is verified that the model has a higher precision forecasting ability.
Intelligent Microgrid Energy Management Method Based on Deep Q Network (DQN)
Authors: OuYang Xinghui , Fan Sixia
Published: March 2023

With the high proportion of renewable energy in microgrid, it brings more and more challenges to the energy management of microgrid. In the meantime, the rise of artificial intelligence has brought new solutions for microgrid energy management. This paper mainly studies the method of integrating deep learning with microgrid. When a variety of flexible resources are connected to microgrid, different energy sources can be coordinated and controlled by determining preferential resources, various demand control signals and real-time electricity prices. In this paper, a deep Q network (DQN) based on deep reinforcement learning algorithm is implemented and combined with a new microgrid model. The numerical results show the effectiveness, adaptability and stability of the deep reinforcement learning method in the optimization control problem of microgrid, and also show the possibility of combining artificial intelligence with power system.
Anti-vibration damage system of CNC engraving machine and finite element analysis of stability
Authors: Zhu Jinjing
Published: March 2023

With the development of industrial technology, engraving technology has become a common industrial processing technology. Aiming at the potential safety hazards existing in the use of the CNC engraving machine, this paper designs a device for preventing vibration damage of the engraving machine based on the operator’s experience and relevant theoretical knowledge, which is connected and assembled by gas spring and 3D print through screws and nuts. It greatly improves its safety performance, mechanical efficiency, and finished product quality and reduces working hours. The modal and static analyses of the two structures of the device are carried out by finite element software to verify the reliability of the structure. The device is applied to the CNC engraving machine to ensure its structural stability.
Strong interference adaptive suppression algorithm for respiratory and heartbeat monitoring
Authors: Tang Jiawei , Zhao Yao , Deng Zhenmiao , Tang Jun
Published: March 2023

A strong interference adaptive suppression algorithm based on frequency-modulated continuous wave (FMCW) radar is proposed for scenarios with complex static targets. The algorithm removes stationary clutter, stationary fixed targets, and random background noise contained in the echo signal through background resolution, background accumulation, background differencing, and adaptive background update and detects human targets using the cell-averaged selected small constant false alarm rate (SO-CFAR) algorithm. Experiments show that this method improves target detection accuracy in low SNR, reduces the impact of background removal on the target phase, and improves the accuracy of target respiration and heartbeat value estimation.
Heart rate measurement method based on wavelet transform noise reduction for low power millimeter wave radar platform
Authors: Wang Haili , Du Fuchuan , Zhu Hao , Zhu Xiaoxiao , Cao Qixin
Published: March 2023

In recent years, non-contact vital sign estimation using millimeter wave radar technology has gotten much attention. Most studies are based on radar platforms that were not built for home scenarios and had high transmitting power and colossal volume. This work employs a low-power millimeter wave radar system produced using Antenna in Package technology (AiP) with a transmit power of less than 6 dBm, significantly lower than that commonly utilized in related research. However, in application scenarios, the echo intensity cannot be maintained at an optimal level with these low-power devices, making accurate and reliable monitoring difficult to obtain. To further reduce the noise component and improve the signal-to-noise ratio, a heartbeat monitoring algorithm based on wavelet transform noise reduction is suggested in this study. The low-frequency terms of the wavelet transform of the chest wall micro-motion signal are interpreted as body random swinging and breathing, and the remaining terms are interpreted as the heartbeat signal. In a 20-minute monitoring experiment, 96.96% accuracy is reached by the method proposed in this study in the context of home scenario monitoring.
20 ps time resolution with a fully-efficient monolithic silicon pixel detector without internal gain layer
Authors: Zambito S. , Milanesio M. , Moretti T. , Paolozzi L. , Munker M. , Cardella R. , Kugathasan T. , Martinelli F. , Picardi A. , Elviretti M. , Rücker H. , Trusch A. , Cadoux F. , Cardarelli R. , Débieux S. , Favre Y. , Fenoglio C.A. , Ferrere D. , Gonzalez-Sevilla S. , Iodice L. , Kotitsa R. , Magliocca C. , Nessi M. , Pizarro-Medina A. , Sabater Iglesias J. , Saidi J. , Vicente Barreto Pinto M. , Iacobucci G.
Published: March 2023

A second monolithic silicon pixel prototype was produced for
the MONOLITH project. The ASIC contains a matrix of hexagonal pixels
with 100 μm pitch, readout by a low-noise and very fast SiGe HBT
frontend electronics. Wafers with 50 μm thick epilayer of
350 Ωcm resistivity were used to produce a fully depleted
sensor. Laboratory and testbeam measurements of the analog channels
present in the pixel matrix show that the sensor has a 130 V wide
bias-voltage operation plateau at which the efficiency is 99.8%.
Although this prototype does not include an internal gain layer, the
design optimised for timing of the sensor and the front-end
electronics provides a time resolutions of 20 ps.
Mobility planning for urban employee to workplace: an analysis of bus routes network and stop locations
Authors: Yusoff Z M , Shuib A , Ishak S Z , Mokhtar E S , Othman F , Ramazan N A
Published: March 2023

Efficient mobility planning for urban employee brings significant benefits to the quality of life and securing freshness to the environment. However, encouraging people to use public transport to workplace is a big challenge although many strategies have been made. The aim of this study is to explore the journey to workplace by urban employee with objectives to analyse the coverage area and stops location along the trip. This research was conducted at Klang District and the focus group were from the urban employee who is using a public bus as daily mobility to the workplace. The research method comprises the interview sessions and the distribution of questionnaire forms to 100 employees. Statistical and GIS analysis were used to show the accessibility pattern, the bus stop location, distance, and time to the workplace area. The GIS network analysis on pathfinding helps in reviewing the current path taken and used to establish the optimal suggestion of routes that the commuter can decide. This research explores the needs for employee in engaging the public bus as the main mobility to workplace. The result proposed route with considering the respondents’ experience issue and mobility parameter to promote the use of public transport to workplace.
Plastic waste knowledge of households towards a sustainable environment
Authors: Nasir N , Malek H A , Januri S S , Malek I A , Jamidin J N
Published: March 2023

Plastic waste in Malaysia has become a serious problem since it affects not only the environment but wildlife animals and marine life too. These may cause by irresponsible people in dealing with their plastic waste management. Therefore, this study is conducted mainly to analyse the knowledge, attitude, awareness, and behaviours of households in Pasir Gudang towards plastic waste management in separating plastic waste before its disposal. A questionnaire was distributed among households who live in this area. The Binary Logistic Regression is used to analyse the knowledge, attitude, awareness, and behaviour of households towards plastic waste management. The results show that only the behaviours of households affect the plastic waste management in their households (p-value=0.04). The Hosmer-Lemeshow test indicates the model has a good fit for the data (p-value=0.480). Other than that, the Omnibus test (p-value=0.03) shows predictors have significant effects and gave improvement to the model. The Classification Table shows the accuracy of 67.4% of the households who separated plastic waste before its disposal. It is suggested to improve the result by adding more respondents to provide insight information on the independent variables, analyse further using other approach such as decision tree and parallelly acknowledge others on the importance of recycling plastic waste.
The determinant of households’ energy cost in rural area of Yogyakarta
Authors: Ridayati  , Hidayati S R
Published: March 2023

We present the result of energy surveys conducted in rural area, Sendangsari village, located in the south of Yogyakarta Special Region. The regression method is used to identify how the contribution of every factor is222. The cost of energy consumption is used as the dependent factor. While the factors of daily cost of fuel, electricity, and LPG, and the usage of washing machine, refrigerator and rice cooker are the independence ones. The data is obtained using questionnaire method to the 67 respondents of Kalurahan Sendangsari residences. The respondent is chosen using simple random sampling technique. The linier regression method is used to identify the contribution of each variable to the household energy cost. The average of energy usage of every household in the village is IDR 34,239.24. Most of the cost is used for the money they spend to buy motorcycle fuel. The results indicate a very strong relationship between energy cost and all variables simultaneously (0.740). The variable has the strongest contribution is the money they use to buy fuel for their vehicles.
The impact of economic development and density population on environmental quality in Indonesia
Authors: Qa A’yun I , Tiyaningsih S
Published: March 2023

One of the important issues today is the problem of global warming and climate change. Global warming and climate change are phenomena of increasing concentrations of greenhouse gases in the atmosphere due to various human activities as a result of economic development activities. The success of economic development activities can be seen from the increase in the value of national output in the form of gross domestic income. Therefore, the purpose of this study is to determine the effect of economic development as measured by Gross Regional Domestic Product (GRDP) and population density to environmental quality in 33 provinces of Indonesia for the 2013-2018 period. The data in this study use GRDP of the agricultural sector, mining and quarrying, processing industry, transportation, population density and the environmental quality index (IKLH). In this study using panel data estimation. The research results show that the fixed effects method is the best method for estimating the existing variables. This research shows that the GRDP of the mining and quarrying sector has a negative and significant relationship with environmental quality in Indonesia. Then the GRDP variable in the transportation sector is positively and significantly related to the quality of the environment in Indonesia. Meanwhile, the variables of GRDP in the agricultural sector, GRDP in the transportation sector, and population density have no significant effect on the quality of the environment in Indonesia.
Watershed characteristics of West Progo dome and its implications on neotectonic
Authors: Budiadi Ev , Listyani R A T
Published: March 2023

This geomorphological study discusses the characteristics of the watershed that compose the West Progo Dome, conducted using a field survey method, topographic map analysis, and remote sensing imagery. This is because the West Progo Dome is built by two different litology characteristics (volcanic and carbonate rocks) and different age. Analysis of watershed characteristics includes area, flow pattern, bifurcation ratio (Rb), and river density (Dd), accompanied by statistical analysis of the T2-Hotelling multivariate mean difference test. The results shows that the West Progo Dome has three large watersheds, namely the Bogowonto, Serang, and Progo watersheds, with an area of about 270.4, 110.9, and 140.3 km2, respectively. The drainage patterns in this area are dendritic, radial, sub-parallel, trellis, rectangular and angulate. Rb of drainage in the study area varies from low to high, indicating the presence of tectonic influences. The Rb value in System IIA is 2.0 - 5.8, and in System III is 1.290 - 6.630. The Dd value on System IIA is 0.921-1.592 km/km2 and on System III is 0.990-1.200 km/km2. This very rough Dd also indicates the presence of tectonic influences. The average Rb and Dd values between System IIA and System III were not significantly different. It means that tectonics influences the watershed morphometry in the West Progo Dome and is still active until the Quaternary (neotectonic).