bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Simulation Experiment of Underwater Cluster Multi-source Information Fusion
Authors: Ji Bei , Tao Mo , Li Hongrui
Published: May 2021

Intelligent cluster information fusion technology is one of the key technologies to solve systematic cooperative operations in underwater manned and unmanned cooperative operations clusters. In this study, aiming at the multi-node hybrid multi-level hierarchical information fusion architecture and global optimization association algorithm based on cluster formation detection, the test scheme and evaluation method of multi-level information fusion are proposed, and the cluster information fusion simulation test system including sonar system, simulation deduction and evaluation system and multi-source information fusion system is constructed. For the first time, the system comprehensively verified the ability of multi-platform from orientation to positioning in the grouping of fusion algorithm, and proved the correctness and effectiveness of the fusion algorithm, which could greatly improve the accuracy of orientation and distance, and formed a highly credible simulation test evaluation ability. The system is extensible at the same time, and can also be applied to other simulation experiments.
Study on Volume Index Test and Control of Large Stone Porous Asphalt Mixture
Authors: Zhang Zhigeng , Zhao Jiasheng , Liu Fangtao , Yang Fei
Published: May 2021

Due to the large proportion of coarse aggregate, the key index void ratio of Large stone porous asphalt mixture is difficult to control in the production process. In order to solve this problem, this paper first carries out the raw material testing and mixture design of LSPM-30; then carries out the comparative analysis of the calculation method and Corelock method for the volume index of Large stone porous asphalt mixture; finally, according to the sample test and porosity calculation, the difference of porosity between the laboratory sample and the field sample is calculated, and based on this, the porosity of the field and laboratory sample is proposed control requirements.
An Approach of Ship Trajectory Clustering Based on Minimum Bounding Rectangle and Buffer Similarity
Authors: Sun Mengzhu , Wang Jiasheng
Published: May 2021

A clustering method based on Minimum Bounding Rectangle and buffer similarity was proposed to improve the trajectories clustering and reduce computation time. Taking the Volunteer Observation Ship data as an example, firstly, we calculated similarity by dividing the area of the overlapped parts of two MBRs by the area of the larger MBR. According to the similarity matrix, the original trajectories were divided into several clusters by coarse clustering using Density-Based Spatial Clustering of Applications with Noise (DBSCAN). After that, the similarity of each cluster was calculated by buffer analysis. Then DBSCAN was used again for each cluster, and the Silhouette Coefficient was used to evaluate the resulting cluster quality. The experimental results showed that the presented methods improve the accuracy of MBR and reduce time cost of buffer similarity.
Uncertainty Analysis of Water Budget for Jinan Spring Basin Based on Numerical Model
Authors: Ni Hanxi , Shu Longcang , Li Hu , Opoku Portia Annabelle , Wang Xiaobo , Zhang Manqi , Yu Yafei
Published: May 2021

Groundwater numerical simulation is affected by many uncertain factors, which directly influence the precision and reliability of simulation results. Therefore, it is very important to analyze the influence of these factors. This paper studied the influence of the uncertainty of sources and sinks on the water budget and the effect on the constant spring flow. Jinan spring basin was chosen as a case study, and a groundwater numerical simulation model was established. In the model, precipitation, groundwater exploitation, and boundary conditions are selected for the local sensitivity analysis. The analysis showed that precipitation is the most important factor affecting the water budget in Jinan spring basin, whilst groundwater exploitation is the most sensitive factor for spring flow. Upon consideration of the impact of these two factors, six different scenarios were developed for the numerical simulation, and quantitative analysis was conducted of the impact of the uncertainties from the sources and sinks on Jinan spring. The results of this study can provide a scientific reference for the effective use of groundwater resources on the constant gushing of Jinan springs.
Acoustic Packet Optimization of Tire Noise Based on SEA Method
Authors: Qiu Bin , Jiang Dayong , Li Peiran , Lin Yongshui
Published: May 2021

As the size of the engine decreases and its performance increases, its noise also decreases, and tire noise has become an important source of vehicle noise. Based on the Statistical Energy Analysis (SEA) method, use Hypermesh and VA-One software to establish a SEA model; through the vehicle PBNR simulation analysis and test benchmarking, the analysis model was calibrated and the accuracy of the simulation analysis was improved. In this research, a new TPNR calculation method is proposed to evaluate the noise reduction effect of tire noise excitation to the car. The acoustic performance is evaluated based on the calibrated SEA analysis model by optimizing the thickness, leakage rate and coverage of the acoustic bag at the luggage compartment floor, front and rear floors, and front and rear wheel covers. It is found that the optimization scheme for the front and rear floors and the luggage compartment floor has better effect, but the optimization effect for the rear wheel cover is not obvious.
Temperature Effect on Main Girder of Strengthened Dongming Huanghe River Highway Bridge in Service
Authors: Xu Gangnian , Yu Xinbo , Li Dawei , Chen Zihua , Zong Xu
Published: May 2021

The main girder of Dongming Huanghe River Highway Bridge was the first prestressed concrete (PC) continuous box girder bridge strengthened by a cable-stayed system in China. In order to study the temperature effect of the main girder structure of Dongming Huanghe River Highway Bridge after reinforcement, based on the measured data of middle span deflection, key section strain and typical crack width, the curve equations of strain and temperature of main girder were obtained by the regression analysis method. The results show that the annual strain value of main girder changed with the acquisition time in a sinusoidal function, and was linearly related to the temperature. The variation of mid-span deflection decreased gradually from side span to middle span, and varied dynamically with temperature in the whole girder, which also has obvious correlation with temperature. The crack width fluctuated up and down in a certain numerical range, which belonged to respiratory cracks and had equally correlation with temperature.
Analysis on the Stability of Top Pushing Construction of Curved Steel Box Beam of a Cross-sea Bridge
Authors: Yu Xinbo , Ma Liang , Ren Shipu , Xu Gangnian , Chen Zihua , Zong Xu
Published: May 2021

The curve steel box girder has the risk of instability in the jacking construction, especially in the case of big waves on the sea surface. It is very important to analyze the stress of the structure during the jacking construction. According to the Midas Civil finite element model, a bridge span is arranged as (49+60+49) m according to various unfavorable loads. The stability of the curved steel box girder bridge during jacking construction is analyzed, and the site construction is controlled according to the calculation results.
Research on long-term deformation monitoring of PC box girder bridge strengthened by a cable-stayed system
Authors: Xu Gangnian , Yu Xinbo , Li Jinxian , Chen Zihua , Zong Xu
Published: May 2021

To study the down-warping improvement for main girder of Dongming Huanghe River Highway Bridge after the reinforcement of the cable-stayed system, the long-term data of the main girder deflection were collected from 2018 to 2020, and the effects of different years, quarters and span on main girder deflection were analyzed, the results showed that the main girder deflection tended to be stable within 9 months after the reinforcement, the down-deflection trend of main girder was effectively suppressed within 3 years, and the effect of the cable-stayed reinforcement was obvious. Compared with 2018, the mid-span of main girder was generally raised in the first quarter of 2020, but the mid-span down-deflection was increased in the second, third and fourth quarters. In the relatively high average atmospheric temperature of each year, the main girder had improved as a whole, and the temperature had a great influence on the deflection of main girder, especially in the third quarter of higher temperature, it can be seen that the deflection of each span fluctuated greatly.
Research on Green Building Materials in Civil Engineering Management System
Authors: Sun Shilong
Published: May 2021

The development of the real estate industry has increased the application market capacity of green building materials, and the demand for green building materials has also greatly increased. The formation of the concept of pollution-free, energy-saving and environmentally friendly housing by consumers has gradually changed the choice of traditional civil engineering construction materials and Cost control. The application and promotion of a large number of green building materials in civil engineering construction has laid a material foundation for the construction of energy-saving and environmentally friendly buildings in China. The article is based on this, using inorganic raw materials potassium silicate, sodium silicate, and silica sol as base materials, add a certain proportion of organic silicon modified styrene-acrylic emulsion, and then add titanium dioxide, kaolin, talc, nano-titanium dioxide and other fillers and coating film-forming additives to prepare water-based inorganic coatings. The test results show that the prepared coating has good physical and chemical properties, environmental protection performance, and fire resistance performance, and can be widely used in the construction industry with obvious social and economic benefits and environmental protection benefits.
Experimental investigation on vortex-induced vibration of variable diameter riser with uniform flow
Authors: Feng Liping , Li Peng , Liu Lihua , Zhong Ziqian , Wang Chuanzhen
Published: May 2021

Diameter design of the riser is a very important link in offshore riser engineering, which will affect a series of parameter changes of the riser. In this paper, the riser is a variable-diameter riser with different cross-sections spliced by riser sections with diameters of 18, 25, and 30. In the wave-flow combined flume, dynamic response parameters such as strain-time history curve and root-mean-square of dimensionless strain were obtained by changing the outflow velocity and diameter of the riser, the effect of variable diameter on vortex-induced vibration of the riser was studied in detail. The results show that the vibration amplitude of the variable diameter riser varies with the axial position of the riser, but the frequency is dominated by the excitation of the thickest section riser; the variable diameter riser is always dominated by the first-order frequency in the outflow velocity range, and the relationship between the in-line and the cross-flow dominant frequency is always 2 times. With the increase of the flow velocity, the root mean square value of strain increases steadily.
Analysis and Optimization of Long Baseline Acoustic Positioning Error of Synchronous Responsive Type
Authors: Wang Tianwei , Yang Guiguang , Deng Yucong , Yan Chao , Yu Wei
Published: May 2021

In order to solve the problem of large time delay and low accuracy of position determination when the long-baseline positioning system is operating at large depths, the underwater acoustic positioning technology of the long-baseline array is studied and the long-baseline synchronization positioning error analysis is carried out, and the simulation verification is carried out by MATLAB. A method for optimizing the underwater acoustic positioning algorithm is proposed. After optimizing the positioning algorithm, in the case of a water depth of 6000 M and a positioning area of 1000*1000m2, the total positioning error of the sitting-bottom long baseline is reduced from the meter level to the decimeter level, and the positioning accuracy is greatly improved. An improved synchronous response type is determined The underwater acoustic positioning can realize the underwater large-scale, high-precision and high-real-time positioning.
Mechanical characteristics of karst tunnel lining structure under the action of groundwater from rainfall seepage
Authors: Wan Fei , Li Xuefeng , Zhang Xuan , Tian Shikuan
Published: May 2021

Heavy rainfall in areas with developed karst depressions will cause the water pressure behind the tunnel lining structure to rise rapidly, which brings about high safety risk of the lining structure. In order to determine the stress characteristics of the karst tunnel lining structure under the effect of rainfall seepage, a load-structure numerical model was established to analyze the changes in axial force, bending moment and safety factor under different water load conditions. The calculation results show that the single-point (small range) water pressure often leads to the damage of the arch and invert of the lining structure. When the pressure-bearing range increases, the damage of the foot and side wall of the lining structure tends to occur. When the overall range of the invert is subjected to water pressure, the damage of the lining structure from the invert to the side wall is likely to occur. Among them, the increasing pressure-bearing range is the most unfavorable water load state, and the safety factor of each part of the lining structure is significantly smaller than that in other three water load states. The research results can provide reference for the design of the lining structure section in similar conditions.
Study on the Vibration Testing Technology in Nondestructive Testing of Masonry Structures
Authors: Zhong Weiqiu , Liu Kun , Yin Rui , Li Wuxu , Jiang Zhipeng
Published: May 2021

This paper presents a method for the application of vibration testing techniques in the nondestructive testing of masonry structures, which gives the masonry compressive and shear resistance as well as vibration deformation performance by calculation, and achieves accurate nondestructive testing of the structure about the actual measured data. The practical example shows that the method is feasible and it provides a scientific basis for the testing of masonry structures.
Vespa Mandarinia Recognition and Prediction Strategy Based on Geographic Location and Image Recognition
Authors: Liu Fangzhou , Zhu Hao , Cheng Xianghong
Published: May 2021

The paper conduct data analysis and information mining from the following four aspects: the correlation between geographic location and the spread of Vespa mandarinia, image recognition with the help of convolutional neural networks, species richness prediction and accurate recognition optimization, Vespa mandarinia reproduction law and reproduction characteristics, and then propose a reliable prediction model of Vespa mandarinia spread range and a model to predict the possibility of misclassification. First, consider whether the spread of pests in a period of time can be predicted. We arrange the 14 Positive IDs in chronological order and use a time series model to predict the spread range, quantify the results as longitude and latitude, and compare the results. The optimal degree is calculated. The results show that this model can accurately predict the staged emergence of Vespa mandarinias. Next, we select 1/6 high-resolution images based on the provided data set files and image files, based on the SNP selection algorithm of the χ2 test, and perform data labeling preprocessing to create a model that can predict the likelihood of a mistaken classification. Further borrow the geographic location of model one and the image recognition of model two, and use both as factors influencing the possibility of whether the newly submitted report is confirmed as a Vespa mandarinia. With the help of the Euclidean distance within the bounds of the rectangular frame, it is compared with the distance between two adjacent points to determine the impact factor 1, which is conducive to predicting the geographical distribution of the Vespa mandarinia through time series analysis. With the help of the image recognition model, the output of the convolutional neural network is used as the second impact factor, which is conducive to high-performance identification of Vespa mandarinias through real pictures. Further analysis shows that the weight ratio of the two impact factors is 3:7. Finally, we analyzed the Vespa mandarinia’s cycle reproduction law, combined with the possible genetic variation and species evolution within the population, and concluded that if there are other new reports, they should be added to the training set to rebuild the model. training. At the same time, the possibility of the elimination of this pest in Washington State is discussed. Through the statistical historical data of the monthly detection report, and further combining with time prediction, until the forecast report stabilizes to 0 within a certain period, or in a certain period If reports are submitted within the cycle, but all non-Vespa mandarinias are judged, it can be deemed that Washington State has eliminated this pest.
Research on Design of Lightweight-Blade Metro Fan Based on Glass Fiber and Phenolic Resin Composite
Authors: Qi Bosong , He Shiji , Cao Xuewei
Published: May 2021

With the development of urban construction and the continuous increase of subway operating mileage, the energy consumption of subway ventilation system has become a hot spot of concern. For the subway fan, a lightweight blade subway fan design based on glass fiber phenolic resin composite material is proposed. It has the advantages of low cost, high strength, and good energy-saving effect. It is an effective way of light-weight and energy-saving subway fans.
Mechanical simulation analysis of lightweight blades using glass fiber phenolic resin composites
Authors: Zhu Lingfeng , Xu Jingfeng , Zhang Wenze
Published: May 2021

This paper uses simulation methods to verify the reliability of applying glass ferroaluminium alloy laminates to subway fan blades. Through the force analysis of its blades, it is found that the material has a wider application prospect in subway fan blades, and it can achieve better energy-saving effects than the existing aluminium alloy blades.
Large scale plate loading tests of refuse soil
Authors: Tian Tian , Hu Jin , Yao Xiaobo , Hu Sheng gang
Published: May 2021

Refuse is a type of soil composed of domestic waste and filling soils. The ch emical components of the refuse is extremely complex, and the mechanical parameters of the refuse is dependent on the local economic development, customs, climatic cond itions and geological condition. In this condition, the field tests is required to obtain th e mechanical parameters of the refuse. In this study the large sale plate loading tests w ere carried out on the refuse soils at the garbage landfill of China International Garden Flower Expo at Wuhan. Based on the tests results the influence sphere of refuse soil un der 1200T is obtained. The tests results can provide reference and guidance for the sim ilar projects.
Study on The Effect of Chestnut Shattering and Mechanical Shattering Mode
Authors: Yang Xueyin
Published: May 2021

In the shelling contrast test, different shelling force and feed displacement of chestnut were tested under different water content, size and loading speed. The main influencing factors were obtained through variance analysis, which provided theoretical basis for the selection of shelling tool and feed displacement of chestnut. The results showed that among the three peeling methods of compression, shearing and kneading, the peeling effect of kneading was the best, followed by shearing and compression.
Vehicle Pose Estimation Method for Lane Line Detection Through Monocular Camera
Authors: Li Xingxing , Duan Chao , Zhi Yan , Yin Panpan , Wang Ningxing
Published: May 2021

Lane detection algorithm is widely used in the field of driverless. In this paper, a lane detection method is proposed to estimate the vehicle’s driving position and attitude. Firstly, a frame of image is transmitted from monocular camera. In this paper, each frame image is pre-processed. After Sobel edge detection, the x-direction edge features of the single frame image are obtained. Then, the region of interest in the image is demarcated, and the line segment in the image is found through Hough transform, and the line ends are filtered, and two are selected respectively for vehicle calculation According to the position line and angle line of pose, the current angle of the camera is calculated by vanishing point, and then the homography matrix is obtained by using the external parameters of the camera, and the image is affine transformed, and the current position of the monocular camera is finally obtained.
Towards Formal Specification for AADL with Behavior Annex in Isabelle
Authors: Tan Yu , Ma Dianfu , Qiao Lei
Published: May 2021

The analysis of safety-critical systems designed by architectural languages such as AADL (Architecture Analysis and Design Language) is a challenging research topic. In such a context, formal methods become an advocated practice in software engineering for rigorous analysis. Moreover, they are applied on specific formalisms to be analyzed on dedicated tools. This paper studies the comprehensive formal specification for AADL language, in particular supporting major components of AADL and Behavior Annex. The presentation of this specification and modeling is the aim of this paper. This work is illustrated with a ARINC653 case study. As a study case, this work develops an AADL model from an ARINC653, specify a set of critical properties of the model and perform formal modeling in in Isabelle/HOL.
The Core Control Strategy Adapted to Different AGC Control Modes for Ultra-supercritical Once-through Furnace Unit Burning Lignite
Authors: Xing Zhiwei , Qin Tianmu , Liu Lei , Shang Yong , Gao Aiguo , Yang Zhenyong
Published: May 2021

As for the once-through unit using lignite, in order to meet the AGC requirements of load change, the coordinated control strategy of unit was optimized. The control strategy was optimized mainly from the aspects of steam temperature control and steam pressure control. In order to control the mid-temperature stability, strategy of using feed water and coal to correct the mid-temperature at the same time was adopted, and the feed water flow was revised by desuperheating water. Different measures including variable parameter control of turbine, rapid coal adding to improve the main steam pressure, and feed-forward adjustment of primary air pressure were taken to improve the delay of main steam pressure, and also shortens the starting time of pressure when changing load. When the unit was put into AGC control, according to the different load changing characteristics of the two modes of BLO and BLR, the variable parameters of the coordinated feedforward of each subsystem were modified. And it is necessary to dynamically adjust the correction factor according to the load fluctuation, in order to reduce disturbance of important parameters such as furnace pressure, main steam pressure, main steam temperature, etc. The application results of the control strategy in the power plant show that the optimized control logic can meet the load regulation requirements of different AGC modes for the lignite burning unit, and the steam temperature and steam pressure control effect is good in the process.
Exact solutions of the mKdV equation
Authors: Yang Yunjie
Published: May 2021

Applying the first integral method, and combining the computation software, Maple, we find exact traveling wave solutions of the mKdV equation. The method is based on the ring theory of commutative algebra.
Study on lifting operation of external heat extractor based on tubular balance beam
Authors: Hu Chunying , Wang Zhuo
Published: May 2021

As a kind of petrochemical catalytic cracking unit, the external heat extractor is one of the key factors restricting the production schedule and time limit. In order to realize the load balance of external heat extractor in the lifting process and avoid the adverse effect of impact force on catalytic cracking performance of large equipment, a method of lifting external heat extractor with tubular balance beam was proposed. At the same time, a kind of seamless steel tube balance beam is designed according to the characteristics of the balance beam and the working conditions of hoisting. Through the stress analysis of the external heat extractor and the strength calculation of the balance beam of seamless steel tube, the rope installation point of the balance beam and the section position of the balance beam are determined, which can provide the theoretical basis and reference value for the failure analysis of large-scale lifting operations and the lifting operations of similar external heat extractor.
Research on Raman Imaging Technology Based on Surface Enhanced Raman Scattering
Authors: Zhao Lei , Zhao Tingdi
Published: May 2021

Raman scattering originates from the change of relative position between atoms in molecules or crystals, that is, vibration and rotation. It is an important analytical method to study the structure of molecules and solid materials. Compared with other analytical methods, Raman spectroscopy has been widely used in many fields such as chemistry, physics, materials science, life science, environmental science, medicine, geology, cultural relics archaeology, public security law and so on, because of its unique advantages such as abundant information, simple sample preparation and no damage to samples. In this paper, the principle and enhancement mechanism of SERS (Surface Enhanced Raman Scattering) are discussed, the Raman imaging technology based on SERS is introduced, and its applications in different imaging fields are discussed in detail. Finally, the existing problems of SERS biological imaging technology are discussed, and the research and application prospects of this technology are prospected.
Accounting ERP Costing System of Electric Energy Enterprise Based on Energy Saving and Emission Reduction
Authors: Wang Jing
Published: May 2021

The paper proposes an accounting cost accounting system for power plants based on energy conservation and emission reduction. It is found that the factory needs to improve the cost control system including environmental costs, and incorporate various subjects such as carbon trading, carbon emission reduction, and carbon tax. The cost control in the era of low-carbon economy is to determine the optimal exhaust gas temperature value under each load to further reduce the coal consumption of the generator set. At the same time, in order to reduce energy loss, the paper also proposes a costing method based on elastic network algorithm, which will amortize the environmental cost of power generation in power companies, and then calculate the cost of the project to realize the power generation of power companies.
Fracture Analysis for the Vavle disc of Nickel Based Superalloy prepared by Hot Isostatic Pressing
Authors: Zuo Dungui , Zhang Zhongwei , Lai Yunting , Zhang Guodong
Published: May 2021

The technology of hot isostatic pressing is combined with the mould control technology under high temperature and high pressure, which can make the powder material quickly and completely shape the complex parts of the forging parts. At the same time, the controllable loading temperature and pressure can be used to realize the preparation and regulation of the material. HIP technology has been widely used in nickel-based alloy valve spheres, valve seats, valve discs and so on. The reasons leading to fracture for the globe valve disc of nickel based superalloy prepared by HIP was analyzed by means of morphology analysis, mechanical properties test, hardness test, metallographic test and other detection means. The results show that there are more black massive carbides, original powder outlines, residual dendrite structure can be seen in the base body structure, and resulting in greater brittleness and poor impact resistance, the fracture failure first occurs under the action of several impact forces generated by the valve action, which in turn causes the sealing gap between the valve disc and the valve seat to change, resulting in the drainage of water from the high pressure side through the gap to the low pressure side, and the gap on both sides metal constitutes erosion.
Experimental Study on Lifting Technology of Hydraulic Driving Screw Pump
Authors: Yan Yongwei , Li Zhiguang , Shao Lifei , Wang Xiaofang , Liu Wei
Published: May 2021

With the continuous development of oil fields, high gradient wells are increased year by year, highlight problem of high gradient wells is present in the low-volume oil wells. Low-volume wells in Dagang oil field land are mainly equipped with rod pump, with serious problem of partial grinding, short production cycle, and low pump efficiency. The the low-volume oil wells characterized by directional wells and horizontal wells in beach are mainly Equipped with ESP, and the trajectories of the wellbore are more complex than the land. The pump flow rate is less than that of the motor shell, the temperature rise of the unit, the motor burned, the cable breakdown and other problems are prominent in ESP lift, and production cycle is short. In view of the above problems, research on lift technology of hydraulic driving screw pump is carried out. the hollow screw is drived by the reverse circulation Power liquid, and the lifting efficiency is effectively improved. Through the test, The system can be adjusted in the range of 0.1-0.24L/s, to meet the production capacity of 10-20m3/d; the relatively constant ratio of power liquid and production Liquid is obtained in the system under different operating conditions, The results show that the whole structure can meet the requirements of large gradient wells or horizontal wells, achieving the production requirements of high gradient and low liquid oil wells.
Real-time Signal Light Detection based on Yolov5 for Railway
Authors: Liu Wentao , Wang Zhangyu , Zhou Bin , Yang Songyue , Gong Ziren
Published: May 2021

To improve the safety and efficiency of train operation, autonomous driving train have developed rapidly in recent years. Among them, the signal detection is one of the most basic functions. However, due to the small size of signal light and the complicated of the railway environment, the signal detection is still a huge problem. The existing methods, such as the approach based on Hough circle transformation, are hard to meet the practical application requirements. In this paper, a real time railway signal lights detection based on Yolov5 is introduced. And a lot of experiments were conducted to prove the effectiveness of the proposed method. The experimental results show that the proposed method achieved 0.972 for both average recall rate and average accuracy rate. Besides, the detection speed of the proposed method reached astonishing 100FPS. Overall, the detection speed and accuracy both meet the practical application requirements.
Deep Text Information Type Detection Model Based on Statistical Learning in Engineering Application
Authors: Wei Chengfu
Published: May 2021

In response to the problem of financial news data in the traditional neural network model, an improved text classification model is proposed. The model optimizes the neural network model based on Word-Embedding + LSTM, which has achieved better text classification in the experiment. effect.
Research on optimization of the number of acoustic arrays
Authors: Wu Yan , Zong Junjun , Yang Hui , Liu Chuanxu , Wang Guangxing , Lv Caofang
Published: May 2021

The reasonable number of base stations in multiple acoustic array azimuth cross location is studied. In this paper, the maximum likelihood estimation (MLE) algorithm is used to discuss the problem of increasing the number of arrays to improve the positioning accuracy, and the positioning error model is given. The experimental results show that with the increase of the number of base stations, the positioning accuracy will gradually improve, but if there are too many base stations, the improvement of positioning accuracy will gradually slow down.
Design and Research of a New Clustering Algorithm for Wireless Sensor Network
Authors: Zhu Yuanjing , Chen Xiaolong
Published: May 2021

At present, the mainstream method to extend the life cycle of wireless sensor networks is to use clustering technology. An improved method based on multi-attribute decision making is designed for the defect of PPTC algorithm. The path cost detection is performed periodically, and the ordered weighted average operator is used to calculate the path consumption weight value and the node weight value. Finally, the Prim algorithm is used to establish the optimal cluster tree. Thus, keeping the best path is always in the optimal state of dynamic updates. The simulation results show that the improved algorithm mechanism is more reasonable than the PTTC algorithm. The network topology and transmission path are more reasonable. Each node can better share the network energy consumption and make the network run longer.
Research on low-speed collision performance of Collision resistance of different materials
Authors: Duan Bingxu , Liu Weidong , Liu Xinran
Published: May 2021

In order to explore the impact of lightweight materials and structures on the performance of anti-collision beams, this paper selects aluminum alloy and carbon fiber as the research objects, and analyzes the difference in low-speed impact performance of open and closed anti-collision beams for these two materials. Based on the structure of carbon fiber materials, the mechanical properties of carbon fiber materials are analyzed. At the same time, a low-speed collision model is established using numerical simulation to study the maximum intrusion amount, intrusion acceleration and intrusion force changes with time during the collision of aluminum alloy and carbon fiber anti-collision beams, And finally use experiments to verify. The research results show that the impact of the open aluminum alloy anti-collision beam and carbon fiber anti-collision beam on the fluctuation range of the collision acceleration is less than that of the closed aluminum alloy anti-collision beam; at the same time, compared with the closed aluminum alloy anti-collision beam, the open aluminum alloy anti-collision beam and carbon fiber, the maximum intrusion of the anti-collision beam is reduced by 8.2% and 18.6%; the carbon fiber anti-collision beam has the greatest force during the collision, followed by the closed anti-collision beam and the open anti-collision beam. The test results are consistent with the numerical simulation, which further illustrates the rationality of the exploration results.
Household gas stove based on multi jet tangential circle and TVC vortex structure
Authors: Wang Xiang , Zhang Renfei
Published: May 2021

In view of the heat loss after combustion and the single-stage direct combustion after contacting with the air caused by the simple structure of the traditional boiler frame, the project adopts the advanced TVC standing vortex technology and multi jet tangential premixed technology. TVC standing vortex technology uses its unique vortex structure to increase the combustion efficiency. As the structure of the project is a semi closed cavity structure, it has great significance for the heat after combustion It has a high interception effect. In order to improve the combustion efficiency, the multi jet tangential premixed technology is used to achieve the appropriate air coefficient in the burner. This project is of innovative significance to improve the combustion efficiency of the current gas stove.
Influence of Test Methods on Fuel Consumption of Heavy Trucks in China — From C-WTVC to CHTC
Authors: Liu Shaohui , Zheng Tianlei , Liu Zhichao
Published: May 2021

In order to reduce vehicle carbon emissions, the Chinese government is drafting new fuel consumption limits standard for heavy commercial vehicles. The standard will adopt new test method, which will have an impact on the results of vehicle fuel consumption. This paper compares the differences between C-WTVC and CHTC, and theoretically evaluates the impact of vehicle fuel consumption. In addition, the impact is empirically analyzed through the actual vehicle test. It is found that the heavy truck switching from C-WTVC to CHTC-HT will increase the fuel consumption by 0.2%-7.6%, and there is a positive correlation between vehicle fuel consumption and gross vehicle weight (GVW). Among them, the increase of fuel consumption is more obvious in the low speed and high speed parts of the test cycle. In order to achieve fuel consumption compliance, enterprises need to focus on low-speed and high-speed fuel consumption performance.
Design and Development of Intelligent Control System for Full Performance Test
Authors: Zhou Yuanfeng , Ding HaiLi , Hu TingTing , Yan Shaokui , Tian Rui
Published: May 2021

Design and develop the intelligent management and control system for the full performance test of the smart electric energy meter to realize the intelligent detection of the full performance test of the electric energy meter. The test intelligent control system is compatible with the automatic connection and disconnection technology of a variety of metering equipment, and realizes the automatic connection and disconnection and automatic testing of the equipment. Complete the automatic capture of abnormal phenomena and automatic judgment of unqualified items, complete the design and validity verification of the electromagnetic compatibility test automatic detection implementation plan. During manual test operation, various circuits and test points can be switched manually to realize automatic testing of various tests. The test intelligent management and control system realizes the system flexible scheduling control strategy, and completes the intelligent scheduling of the status of the equipment to be inspected and the idle status of each test unit.
Design and Research of Constant Magnetic Field Verification Device for Electric Energy Meter
Authors: Cui Shengsheng , Gao Yang , Yang Yan , Ma Bin , Sun Jianfeng , Li Xi , Hua Shubei
Published: May 2021

Design the electric energy meter constant magnetic field verification device system, carry out the constant magnetic field verification, and realize the electric energy meter constant magnetic field automatic verification. To ensure the accuracy and traceability of the magnetic field, a magnetic field sensor is installed at the bottom of the tray, and the test magnetic field is read in real time through the magnetic field sensor. The device is fixedly connected with an infrared sensor to detect the rotation angle of the magnetic steel. The operation of the three-axis motor of the magnetic field detection device changes the position of the magnetic steel around the bottom and top of the electric energy meter to complete the verification of the entire electric meter. The electric energy meter constant magnetic field verification device has high accuracy, strong safety, and can complete the automatic detection function.
Research on Modal Characteristics of Vehicle Chassis Transmission Shafting Based on ADAMS
Authors: Shen Liangyuan , Bo Cui
Published: May 2021

Vehicle chassis usually adopts variable speed axial transmission system composed of universal joint transmission shaft and gear pair. The vibration, impact and energy loss are related to the efficiency of power transmission and the safety performance of equipment. Since variable shaft transmission system is the key component of vehicle chassis, vibration and noise reduction is the inevitable way to improve vehicle quality, energy conservation and environmental protection. However, researchers have done a lot of work on the dynamic characteristics of gears, rarely considering the influence of cardan shaft on the modal characteristics of gear pair system. Taking the rear wheel drive system of a vehicle chassis as the research object, the virtual prototype simulation model of the transmission shaft main reducer assembly is established by using the dynamics software ADAMS, and the influence of the stiffness of the shaft and the intermediate support on the noise and vibration characteristics of the rear axle main reducer is analyzed. At the same time, the accuracy of the simulation results is verified by experiments, which provides a reference for the parameter design of the drive shaft and the rear axle final drive.
Energy Commodity Logistics Planning method based on Machine Learning method
Authors: Jiang Hongchao
Published: May 2021

In order to cope with the increasingly fierce competition in the market of refined oil products, improve the level of logistics operation and achieve logistics efficiency, a transportation scheduling method of refined oil logistics based on dynamic programming model was proposed to improve transportation efficiency, reduce logistics costs and increase enterprise benefits. Firstly, the basic ideas of logistics and transportation scheduling of refined oil were analyzed, and the comprehensive system of logistics and transportation scheduling of refined oil was constructed. The statistical analysis and sampling of logistics and transportation scheduling of refined oil were carried out by adopting the adaptive dynamic programming method, from which the characteristic values of association rules which could reflect the level of logistics and transportation scheduling of refined oil were extracted. Big data information fusion method is used to optimize the dynamic planning and transportation mode of refined oil logistics and transportation scheduling, and the spatial dynamic programming model of refined oil logistics and transportation scheduling is established. Combined with pattern recognition and path optimization method, the optimal design of refined oil logistics and transportation scheduling model is realized. The simulation results show that this method has good adaptability to transport scheduling of refined oil logistics, and the transportation efficiency of refined oil logistics is improved, the route is optimized, the level of enterprise guarantee is improved, and the logistics cost is reduced, which provides a strong guarantee for expanding the market and increasing the efficiency.
Wind turbine tower failure analysis and wind-induced vibration control
Authors: Gao Hui , Li Xing
Published: May 2021

Wind energy has great potential for development in clean energy. The economic loss caused by the destruction of the wind turbine tower in a wind turbine failure is very huge. Therefore, this paper analyzes the gray correlation between the tower damage type and the cause of the damage. The results show that storms, pitch system failure, and wind speed exceeding the design wind speed have a good correlation with the tower damage type. In a storm environment, the dynamic response of the tower top of the wind turbine tower is relatively large, even leading to the overall collapse of the tower. The tuned mass damper (TMD) has an obvious damping effect on the wind vibration response of the tower.
Filtering of microseismic data based on information about signal phases
Authors: Azarov AV , Serdyukov AS
Published: May 2021

Seismic data filtering algorithm has been developed. The proposed algorithm allows amplifying signals from the sources located inside a selected area of space. The paper presents a theory describing the principle of this algorithm. Testing on synthetic data showed that the proposed filtering method is capable to suppress signals from the sources located outside the selected area of space. On semi-synthetic data it was shown that the proposed filtering method allowed to suppress real noise and significantly increases the signal-to-noise ratio for the events located inside a selected area of space.
Improvement of downhole probe control system for the measurement of hydraulic fracturing at considerable distances from the working contour
Authors: Leontiev AV , Rubtsova EV , Lekontsev YuM
Published: May 2021

Actual issues of improving the design of the downhole probe as part of equipment for the practical implementation of the method of measuring hydraulic fracturing in mine conditions were discussed. The variants of the probe operation control schemes are presented using a single press pipeline, designed to simplify the installation of the equipment in the borehole, especially at considerable distances from the working contour. The new design map for controlling the process of probe packing is considered. Its application eliminates unstable deformation of sealing elements, in case of the well diameter increase above the nominal value, ensuring reliable sealing of the test area.
Consideration of block structure in mathematical models of rock mass
Authors: Chanyshev AI , Belousova OE
Published: May 2021

For the media with periodic changes in Young’s modulus and yield strength, the problems of stress, strain and displacement distribution around single excavations of spherical and cylindrical shape are solved. Block structure of the medium is determined by the difference between the elastic modules and the yield strength in the blocks and interblock space. In each case analytical solutions are obtained. The influence of blocks quantity, difference in block properties and interlayers on the nature of changes in stresses, strains and displacements was studied. It is noted that block structure is one of the factors for forming zonal disintegration around excavations.
Deep-seated tectonics and its relationship to dynamic processes caused by ore mining (according to xenolith study)
Authors: Shevchenko YuS
Published: May 2021

The paper examines a possible relationship of the occurrence of catastrophic situations (earthquakes, rock bursts, etc.) in unordinary conditions and manifestations of tectonic processes in the bowels of the Earth at the “lower crust-upper mantle” level. It is shown that such tectonics is observed in basite-ultrabasite xenoliths bearing clear features of deep-seated deformation (olivine twinning, curved crystals, drag grains of spinel, preferred orientation of optical indicatrices of minerals, etc.). The mentioned relationship is studied from the viewpoint of relaxation reaction of rock masses, rocks and their element components on mass displacements in the Earth’s depths.
Modeling viscous fluid-induced fracture propagation in the compression field
Authors: Kolykhalov IV
Published: May 2021

The paper describes the experimental studies into viscous fluid-induced fracture growth from the initially circular crack in the field of compression. The experimental relations between the induced fracture shape and viscosity and injection rate of pressure fluid are obtained. The influence of the pressure fluid properties on the induced fracture parameters is analyzed.
In-well vibration effect on cement stone impermeability
Authors: Kordubailo AO , Simonov BF , Nechaev NS
Published: May 2021

Impermeability tests are carried out on cement stone under the influence of operating downhole vibration exciter. It is found that cement stone preserves its porofractured structure under the static force impact. Under the local vibration effects within 10 h, a the initial structure of microfractures becomes dynamic but the relative reduction in the proof-test pressure increases 2–3 times. The ingress of water is absent in cement stone, which means the absence of risk of behind-the-casing flow of fluid and water under the action of in-well vibrations.
Design and experimental study of automatic source of P-waves in rock mass
Authors: Tkachuk AK , Primychkin AYu
Published: May 2021

The paper describes application of vacuum impact machines in underground mineral mining. The main parameters are determined experimentally for the automatic control of operation of such machines, and the key area of further improvement is identified.