bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of the Influence of UNMANNED Aerial Vehicles Stationed in Tower Airport on Tower Structure Safety
Authors: Gao Song , Xiao Tan , Wang Qianwen
Published: April 2023

In order to solve the problems of uav inspection, such as limited endurance and difficulties in long-distance communication and control, it is proposed to set a steel structure platform on the tower as the airport of UAV. The installation of the tower airport will increase the permanent load and generate additional wind load, which may adversely affect the tower. In this paper, the tower of 220kV overhead transmission line is taken as an example to establish the finite element models of uav platforms at different positions of the tower and with different tower types. Considering the load effect of the tower and the platform, the maximum displacement and maximum stress of the initial model of the tower and the model after the installation of the platform are summarized and analyzed. The results show that the uav platform under the tower body has little influence on the safety performance of the tower, meets the safety operation requirements of the tower, and provides a new idea for the intelligent inspection of the transmission line uav.
Design of Wall Climbing Robot Device based on Bionics
Authors: Huang Guiyun , Ji Jun , Shi Mengdi , Li Yong
Published: April 2023

Based on the principles of bionics and vacuum adsorption, a bionic wheeled robot is preliminarily constructed. The driving part of the device is fully pneumatic. The operation process depends on the circulation of suction and exhaust of each set of suction cups, Achieve the function of adsorption and climbing. It is a pneumatic wall climbing robot device. The device not only has the advantages of fast moving speed and high efficiency of wheeled robot, but also has the advantages of bionic wall climbing robot. Wall climbing robots can climb on vertical walls. After loading various tools, it can replace workers to carry out some complex or dangerous work. it is widely used in all walks of life.
Comparative Analysis of Isolation Effects of Laminated Rubber Bearing and Composite Rubber Bearing Used in Bridges with Different Pier Heights
Authors: Jiang YF , Zhong HQ , Deng XW , Dang XZ
Published: April 2023

In order to reveal the vibration isolation performance of new composite rubber bearings (CRBs), this paper establishes a numerical model of composite rubber bearings based on SAP2000, and studies the seismic response of bridges supported by LNB and CRB at different pier heights. The results show that compared with LNB, CRB can effectively reduce the shear force and bending moment of the pier without increasing the structural displacement.Compared with LNB, the advantages of CRB in isolation performance vary little with pier height, which indicates that CRB has broad application prospects..
Seismic Design Optimization of Frame-multi-ribbed Composite Wall Structure
Authors: Liu J , zheng RL , Zeng WH
Published: April 2023

To explore the optimization seismic design of frame-multi-ribbed composite wall structure, firstly the finite element model of a six story frame-multi-ribbed composite wall structure is established based on the software of SAP2000. Secondly the critical design parameters of multi story frame-multi-ribbed composite wall structure under seismic action are analysised using finite element analysis software. Finally the seismic response of the structure under different rib combinations and the optimal arrangement rule of the structure are studied. The results reveals that the lateral stiffness of the structure cannot be effectively improved by increasing the number of rib grids of the multi ribbed composite wall. The results can provide a theoretical basis for the design of the multi story frame-multi-ribbed composite wall structure in the medium and high earthquake intensity area.
Research on Bearing and Seismic Isolation Design of Extrodosed Cable-stayed Bridge With Ultra-wide A-type Tower in High-intensity Areas
Authors: Huai CZ , Li C , Yu FL
Published: April 2023

In order to improve the support and isolation performance of the escape cable-stayed bridge with super wide A-type tower in high-intensity areas, the paper takes Jingyuan Jinshatan Yellow River Bridge as the background, based on the finite element method, and takes the design of 20000 ton isolation bearing as the case, optimizes the design parameters, structural composition and friction pair settings of the bearing, and develops the actual bearing to meet the needs of the project by combining simulation analysis and experimental testing. The results of time history analysis show that the displacement of the strength support seat at the bottom of the pier and the expansion joint at the beam end can meet the design requirements.
Experiment Design of Precast Small Box Girder and CIP Hidden Bent Cap Structural System
Authors: Huang XF , Bu ZY , Xu SL
Published: April 2023

In order to effectively reduce the structure height, this paper proposes a structure with integral connection of precast small box girders and CIP hidden bent cap. A 40% scale specimen was designed suitable for hidden bent cap system. To test the feasibility of the connection, a single girder model of test unit was established using finite element analysis program. The analysis results were used to predict the test results and to ensure that the behavior of the test specimens during the test was consistent with that of the prototype. The simulation results showed that the overall stress distribution was presented tensile at the top and compressive at the bottom, with the ratio of maximum tensile stress to maximum compressive stress at approximately 33%.
Design of Energy Absorption Device for A Separator
Authors: OuYang LG , Huang F , Long TM , Wang G , Wang L , Yuan R
Published: April 2023

To verify the working performance of the energy absorption device, CAE simulation software is used to simulate the working process of the energy absorption device. Firstly, the three-dimensional modeling software is used to establish the three-dimensional model of the energy absorption device, and then grid division software is used to divide the established three-dimensional model. Finally, the simulation calculation is carried out in the CAE simulation software. The results show that the speed of the high-speed stone with a diameter of 110mm is reduced from 22.3m/s to 10.2m/s under the action of the energy absorption device, and its energy is reduced by 81.5%. The working effect of the energy absorption device meets the expected requirements. This study provides a great reference value for the design of energy absorption devices.
Design of New Fan-Shaped Combined Wear-Resistant Plate for Super Tonnage Spherical Bearing
Authors: Ning XL , Gu XH , Xia JY , Leng XY , Zhang XF
Published: April 2023

In order to improve the bearing and wear resistance of the sector composite wear plate, a new sector composite wear plate is designed based on the finite element method. By establishing the finite element calculation models of integral, segmented small circle inlaid and new fan-shaped combined anti-wear plate ball bearings, the pressure bearing and wear resistance of three types of wear plates are analyzed, calculated and compared. The results show that the three types of wear plates can meet the pressure bearing capacity. The pressure bearing capacity of the new fan-shaped composite wear-resistant plate is similar to that of the integral type, which is superior to that of the segmented small circle inlaid type. Because of the advantages in structure, processing and installation of the new fan-shaped composite wear-resistant plate, it is particularly worth popularizing and applying in the super spherical bearing.
Seismic Characteristics of Integral Abutment Bridge with Rigid-Flexible Combined Abutment Based on Shaking Table Model Test
Authors: Huang HY , Li L , Liu F , Zhou GJ
Published: April 2023

Aiming at the problem that the strong structure-soil interaction of rigid abutment integral bridge and semi-flexible abutment integral bridge, a new integral abutment bridge with rigid-flexible abutment was proposed, and the shaking table model test was carried out to study its seismic performance. The test result shows that at the seismic fortification intensity 6, the specimen are relatively intact, and no crack was generated, which shown the integral abutment bridge with rigid-flexible combined abutment has good seismic performance. The first-order and second-order frequency of integral abutment bridge with rigid-flexible combined abutment are about 5.0 Hz and 10 Hz, respectively. The damping ratio coefficient of rigid-flexible combined abutment-pile-soil system is about 0.18~0.25. The soil-rigid-flexible combined abutment-pile interaction amplified from 10.71 times the pile diameter above the bottom of the pile foundation. The maximum dynamic amplification factor of specimen and soil are located at the abutment bottom and the soil surface, respectively.
Numerical Study of Tsunami Force on Superstructure of Offshore Rigid Frame Box Girder Bridge
Authors: Gu Y , Yu AH , Zheng FD
Published: April 2023

Offshore bridges need to bear complex wave and current loads and face the threat of extreme loads such as tsunamis. Potential tsunamis will have disastrous effects on coastal areas. Compared with conventional beam bridges, there are few studies on rigid frame box girder bridges. In this paper, based on a continuous rigid frame box girder bridge in the offshore area, the parameters of tsunami impact force are analyzed. First, based on Stoke theory and water level in the storage area, the water level in the static water area and quasi stable area in the dam break wave working conditions are obtained, and 12 kinds of dam break wave working conditions are preliminarily proposed to be used for the background bridge. Then, according to the determined simulation working conditions, the box girder dam break impact numerical model is simulated. According to the calculated results, the stress characteristics of the box girder under the tsunami impact are described in the way of time history stage division, and on this basis, The stress mechanism is analyzed from the whole level and local level. The results show that on the whole level, the variation of horizontal force and vertical force with time can correspond to the variation of dam break flow around the box girder. At the local level, the horizontal wall boundary bears the vertical force, the vertical wall boundary bears the horizontal force, and the inclined wall boundary bears both the horizontal force and the vertical force. In addition, negative pressure is the cause of suction on the wall boundary. It provides a reference for the calculation and analysis of tsunami load of offshore rigid frame box girder bridges, the identification of bridge failure modes and the formulation of protective measures.
An Accurate Subspace Clustering Model for Unsupervised Noise-laden Hyperspectral Image Segmentation
Authors: Lin ZX , Jiang YH , Wu CM , Wang JG , Yan S
Published: April 2023

The hyperspectral image acquisition in realistic situations is accompanied by a lot of noise, which dramatically interferes with the discriminative power of the clustering model. In this paper, a superpixel segmentation 3D regularized subspace clustering model (SS3D-SSC) is provided, which uses a superpixel segmentation method to obtain the most representative pixel in each tiny region and use it as a representative to replace other pixels in the same area, and then use sparse subspace clustering to perform the subsequent image segmentation, the proposed method in this paper is used in Indian Pines.The reliability of the algorithm is confirmed on the Indian Pines, Salinas and Pavia University datasets. Compared with the most advanced SSC-based algorithms, even using graph convolution subspace clustering, SS3D-SSC model has better classification performance and anti-noise ability.
Numerical Analysis of Elastomeric Bearings Equipped with Steel Ring Restrainers
Authors: wang ZF , Wu H , Zhao TF , Yang C , Zhang Q
Published: April 2023

In order to improve the seismic performance of bridges, the design of high-performance isolation bearings can effectively reduce the displacement response caused by earthquakes. This paper proposes a novel seismic isolation bearing (EB-SRRs) to prevent the unseating of bridges. Based on the finite element (FE) analysis method, the mechanical properties of EBSRR are simulated and analyzed, and the performance of EB is compared experimentally. The experimental results show:(1) When the shear strain reaches 93%, the reaction force provided by EB SRRs model is gradually higher than that of EB model due to the activation of SRRs; (2)With the continuous increase of horizontal displacement, the reaction force of EBSRR model increases significantly; (3)SRR increases the area of hysteresis loop, and the increased area in each loop increases with the increase of load displacement
A Multivariate Time Series Anomaly Detection Method Based on Clustered Particle Swarm Optimization
Authors: Gao R , Ding YR , Wang Y
Published: April 2023

Due to the advent of 5G and the integration of sensors, sensor nodes need to collect data from multiple sources simultaneously.Traditional anomaly detection methods for single attribute time series detect multivariate data, low detection accuracy, and significant node energy consumption. To avoid these problems, this paper provides an improved FCM multivariate time series clustering method based on the sliding window. Based on the CPSO optimal weight, the reconstruction error realizes anomaly detection. Experiments on different datasets demonstrate the effectiveness of the algorithm. Moreover, compared with the three classical methods, the results show that the proposed algorithm has higher detection accuracy and accuracy.
Extremely Weak Signal Detection Algorithm of Multi-Pixel Photon Detector
Authors: yang Y , Zhao PR , Wang XB , zhang JL , Yang FM , Min ZW
Published: April 2023

For the detection of extremely weak signals in underwater long distance wireless optical communication, the Geiger mode of the multi pixel photon detector has serious pulse superposition effect and Poisson noise, which leads to counting difficulties and affects the measurement accuracy. This paper proposes a deconvolution joint generalized Anscombe transform (DUGAT) detection algorithm. First, the deconvolution filtering technology is used to process the weak signal to reduce the superposition effect and converge the pulse width. Secondly, the noise signal of Poisson+Gaussian (P+G) distribution is converted into Gaussian variable by using generalized Anscombe transform (GAT), which is equivalent to additive Gaussian noise signal. Finally, the symbols are counted by hard decision algorithm. The experimental results show that the sensitivity of this algorithm is improved by 8.57dB and 9.95dB respectively compared with the traditional AR and ML detection algorithms.
Analysis on Reliability of Wind Barrier on High-speed Railway Bridge under Wind Load
Authors: Zhang T , Sun Q , Li YH , Zhang XF , Li PF
Published: April 2023

In order to guarantee the safety of wind barrier structure on the railway bridge and to prevent the overturning of wind barrier in the strong wind impacting on the normal operation of the train, the study on reliability of wind barrier is conducted. Taking the single side 4m wind barrier installed on the Lanzhou-Xinjiang second double-line railway bridge as an example, considering the randomness of natural wind velocity and train speed, based on the probabilistic theory analyze the reliability of the wind barrier structure system under the static wind load and dynamic wind load, and evaluate the wind barrier safety with the reliability index and failure probability of structural system. And parameter sensitivity analysis is performed to find out which factors are more important to the reliability of the wind barrier system. The research results show that the reliability index of the wind barrier system meets the requirements of the design specification, and the failure probability is small; the reliability index of the wind barrier system under the static wind load and dynamic wind load is more sensitive to the wind velocity than the train speed.
Analysis on the Seismic Behavior of RC Frame with Different Special-shaped Columns at the Bottom
Authors: wang JF , Zeng WH , lu CF
Published: April 2023

In order to study the seismic behavior of the bottom large-bay frame with different special-shaped columns, the numerical models of the special-shaped columns frame with ordinary, dark and square columns at the bottom are established using the finite element analysis in ANSYS. The three type special-shaped Frame are performed with nonlinear time-history dynamic method under earthquakes. The dynamic characteristics and seismic response of the three type RC Frame are conducted. The weak parts and the development of the plastic hinges on the end of beams and columns are discussed. The results show that the special-shaped frame with bottom square columns can overcome the weak phenomenon at the bottom, and provide outstanding seismic performance compare with the other two frames.The seismic behavior of the special-shaped columns frame with dark columns is better than the normal special-shaped columns, however it can not effectively overcome the weak parts of the bottom floor. The results can provide a theoretical basis for the engineering application of the frame with special-shaped columns.
Static Response of Self-anchored Suspension Bridge under Vehicle Load Considering Time-varying Effects
Authors: Du AX , Zhou GP , Fan J , Zhang YY , Geng ZW
Published: April 2023

In order to study the structural state of the bridge under the influence of time-varying effect, the response of the concrete self-anchored suspension bridge under vehicle load and temperature load during the 30-year operation period is studied, through field load test and finite element analysis based on ANSYS refined spatial solid model. The results show that with the increase of the service life of the bridge, the bottom plate of the box chamber of the main girder gradually tends to be tensioned in the longitudinal direction of the bridge, and the horizontal preload stress of the main girder gradually loses when the bridge is completed; The transverse bridge stress at the junction of the outermost bottom of the box chamber and the web tends to be tensile, while the transverse bridge stress at the measuring point of the inner bottom plate gradually increases. The change value of the cable force of the hanger is obviously affected by the restraint mode of the support. Affected by the main tower support, the cable force of the hanger adjacent to the main tower decreases greatly. During the operation of the bridge, the working conditions of the mid span and east span hangers shall be monitored.
Analysis on Load Capacity of Grouted Ducts Connected Precast Piers under Action of Bi-directional Compression and Bending
Authors: Chen HC , Sun J , Lin FJ , Yan S , Xia ZH
Published: April 2023

In order to improve the accuracy of the calculation method of the bearing capacity of the prefabricated pier connected by the grouting bellows, the calculation formula of the ultimate bearing capacity of assembled bridge piers with grouting corrugated pipe connection under the action of bi-directional compression and bending is deduced. Firstly, the quasi-static testing of cast-in-place piers and prefabricated piers under unidirectional and bi-directional loading are introduced, the ultimate bearing capacities are compared. Secondly, according to the arrangement position of the neutral axis and the static force balance relationship, the calculation formulas of the ultimate bearing capacity in two directions under the action of constant axial force are deduced. Finally, the calculation formulas of derivation were verified by the experimental results, and the calculated yield surfaces of the prefabricated piers with grouting corrugated pipe connection under different axial forces are established. The results show that the experimental results are relatively close to the numerical calculation results, the average error does not exceed 10%, and the P-Mx-My three-dimensional yield surface provided a relatively simple and quick method for the cross-sectional safety verification of precast segmental piers with Grouting Corrugated Pipe Connection.
Bonding Performance of Epoxy Modified Cement-based Adhesive
Authors: Xiang W , Zhang H , Chen P , Zhao Q
Published: April 2023

To improve the bonding properties of cement-based adhesives, epoxy resin is added in this study. The effects of various mix parameters, including epoxy, PVA powder, HPMC, silica fume, and synthetic fibers, and water contents, on the mechanical performance of epoxy modified cement-based adhesives are investigated. Experimental results show when the content of epoxy exceeds 15% of the cement by weight, the bond strength improves by more than 90%. But excessive epoxy adversely reduces the compressive strength of cement-based adhesive. The addition of PVA powder and HPMC also enhances bond strength. Water binder ratio and silica fume mainly affect the compressive strength of the cement-based adhesive. The addition of synthetic fibers greatly improves the toughness and crack resistance of the material. This study provides a solid basis for the optimization of mix compositions of cement based adhesives in various civil engineering applications.
Study on Temperature Effect and Calculation Method of Steel-Concrete Composite Bridge
Authors: Xiang W , Zhang H , Zheng ZY , Ding JK , Zhao Q
Published: April 2023

In order to investigate the mechanical performance of the steel-concrete composite beam bridge under temperature, the stress and shear distribution of the three-span composite continuous beam bridge under temperature are investigated by combining finite element and theoretical methods. The results show that the maximum error ratios of the longitudinal stress obtained by the two calculation methods are 8.7% and 9.4% under the system temperature and temperature gradient, respectively. The maximum errors of the stress curves are less than 5%, which is in the acceptable range. The reasonableness of the finite element calculation results is proved and a basis for the mechanical performance analysis of the combined continuous girder under temperature is provided.
Seismic Performance Assessment of Girder Bridges with Composite Rubber Bearings
Authors: Zhong HQ , Dang XZ , Deng XW , Guo JJ , Yuan WC , Wang ZQ
Published: April 2023

The objective of this study is to analytically assess the effectiveness of a novel composite rubber bearing (CRB), which is proposed to enhance both the displacement and damping capacities of the laminated natural rubber bearing (LNB), in improving the seismic performance of girder bridges. Four numerical bridge models respectively with the unbonded and bonded LNBs and CRBs (i.e. ULNB, BLNB, UCRB, BCRB) are established based on the bearing restoring force models. Then, incremental dynamic analyses (IDAs) are performed to obtain the fragility functions and the estimated economic costs. The results show that the bearing fragilities of the two CRB bridges are between those of the two LNB ones, but the pier damage is obviously mitigated by the CRBs, leading to the lower system vulnerabilities and economic costs. Allowing bearing sliding can further reduce the damage probability of the piers, but enlarge that of the bearings especially for the collapse limit state.
Sensitivity Analysis of Design Parameters of Prefabricated Cantilever Structure
Authors: Cao XX , Yang DH , Wu CF , Yang K
Published: April 2023

Prefabricated cantilever structure is a new type of structure in mountain expressway construction. In this paper, a new numerical simulation model of prefabricated cantilever structure is established. The model takes into account the modularization and assembly of components and the interaction between structure and soil. Based on the developed model, the effects of two design parameters (steel plate thickness between column and cantilever and column concrete grade) on the mechanical properties of the structure were evaluated. The modeling and simulation results show that the two design parameters have a slight impact on the mechanical properties of the main components (such as columns and cantilevers), but the steel plate between columns and cantilevers can significantly improve the mechanical properties of the connection structure. The thickness of steel plate can only be set according to the structure and stress distribution at the connection position
Experimental study on the flexural performance of steel-concrete composite section of self-anchored suspension bridge
Authors: Huai CZ , Ren ZM , wang L , Zhao CX , zhao FL , Luo J
Published: April 2023

In order to study the flexural performance of the steel-concrete composite section of self-anchored suspension bridge, a test model of the steel-concrete composite section was fabricated according to the scale of 1 : 3 based on the Wushui Bridge, and a four-point negative bending test was carried out. The results show that the residual displacement ratio is 0.7%, and the experimental model is in the elastic stage under the design load condition, which incidate that the component is safe under normal service condition. Under the overloading condition, the residual displacement ratio is 19%, the experimental model is in the elastic-plastic stage, but the stress of materials still meets the requirements. Under the two conditions, the deformation angle of the composite section is small and the stiffness transition is stable. The relative slip between the steel plate and concrete in the composite section is small (no more than 0.25 mm). The stress in the top steel plate and bottom steel plates of the composite section are gradually decreases during the transfer from the steel stiffening beam to the concrete side. The design of the steel-concrete composite section is reasonably loaded, and the mechanical properties are smoothly transferred.
RLS Channel Estimation Combined with Channel Equalization in Oversampled Frequency Domain for FBMC-QAM Systems
Authors: Sun HY , Li SY
Published: April 2023

In order to reduce the bit error rate and improve the anti-interference performance, this paper proposes a channel estimation algorithm based on RLS. RLS channel estimation algorithm obtains the current estimation data by modifying the final estimation data. First, the first data is estimated by least squares (LS), and then the date is adjusted in real time through forgetting factor and recursive formula to obtain all estimated data. The results show that RLS channel estimation algorithm can reduce the computation, improve the accuracy of channel estimation, and suppress noise interference. As the number of iterations increases, the channel estimation will be more accurate, effectively reducing the bit error rate.
Intention Recognition Method Based on Resting-state and P300 Task-state Dynamic Brain Functional Network Features
Authors: Yi X , Wang ZM , Heng X
Published: April 2023

In order to reconfigure its structure from the static state in the vision odd ball task, so as to realize the intention recognition based on the characteristics of the brain functional network. The thesis proposes the intention recognition method based on resting state and P300 task state dynamic brain functional network features. First, the brain connectivity in each time window is constructed into a brain functional network using phase lock value (PLV). Then, extract the global features (global efficiency, transitivity) of the brain functional network, and use Louvain algorithm to obtain the brain functional network community. The experimental results show that in the (100-200) ms of P300 task status, the core nodes are mainly concentrated in the forehead region and the central region, while in the (300-500) ms of P300, the core nodes are concentrated in the temporal lobe. The recognition accuracy based on this method reaches 93%.
Research on the Model of Rectifying the Longitude and Latitude of the Base Station in the Main Cell Based on the Adjacent Cell Data
Authors: Wang QS , Liu XC , Gao ZH , Gong YP
Published: April 2023

In order to solve the problem that the location prediction rate of the base station is low due to the insufficient MR data within the coverage range of the base station, based on the inspiration of the grip rule, the longitude and latitude correction model of the base station in the main cell based on big data is established by using the coarse positioning data and fine positioning data of adjacent cells. Taking Guangdong Telecom as an example, the experimental results show that the prediction rate of base station location is significantly improved from 69% to 92%.
Performance Analysis of Unslotted CSMA/CA Based On Channel Dedicated For VLC Networks
Authors: Yang Y , Feng ZY , Wang XB , Xu YW
Published: April 2023

Due to the advantages of rich frequency band, security and confidentiality, visible light communication technology is gradually regarded as an effective solution to the exhaustion of radio frequency(RF) spectrum resources. This paper designs a channel dedicated unslotted CSMA/CA algorithm, and analyzes the impact of collision probability, retransmission times, access failure probability, and normalized throughput on the network performance when transmitting non-real-time traffic. The results show that the collision probability is inversely proportional to the terminal payload packet arrival rate λ, as the number of terminals increases, the saturation collision probability of λ =1 is 0.501 and λ =2 is 0.382, The access failure probability increases nonlinearly with the increasing terminals numbers, but when the number of terminals exceeds 5, the access failure probability increases sharply, the normalized throughput decreases continuously and tends to saturate when the total channel traffic reaches the physical limit of bandwidth.
Mechanical System Structure Design of Transmission Line Maintenance Robot
Authors: Ma J , Li C , Zhang ZY , Jiang XH
Published: April 2023

Aiming at the problems of insufficient research and difficult control of existing transmission line maintenance robots, a modular four-wheel mobile robot mechanical configuration scheme is proposed. We analyze the working environment of the existing transmission line and the working requirements of the inspection robot. Then, the overall architecture design, function division and mechanical simulation of the robot are carried out, and a joint motion model that is easy to expand and universal is put forward. Finally, a prototype robot is developed, and corresponding software and hardware design of the control system is completed. The live line maintenance operation experiment is performed on simulated lines and actual transmission lines. The results show that the effective module division and reconstruction scheme of the configuration scheme are correct and feasible, and the joint motion trajectory of the robot is optimized, which also improves the work efficiency and safety.
Research on trajectory planning of mobile manipulator based on improved gradient projection algorithm
Authors: Wei LJ , Wu HB , Liu HL
Published: April 2023

This paper takes a 10 DOF mobile manipulator as the research object. Aiming at the problem of joint acceleration overrun in the trajectory planning of a 10 DOF Manipulator, firstly, the scale factor is obtained by the extremum method. Compared with the commonly used extremum method, the optimization degree and the self motion limit factor are introduced, and a new algorithm considering joint acceleration constraint is deduced and proposed. By comparing the simulation results of the inverse solution algorithm, the effectiveness of the new algorithm is verified. Finally, it is applied to a mobile manipulator with 10 degrees of freedom for example motion test. The test results meet the design requirements. The results will be actually applied in engineering projects.
Milling Simulation of NC System Based on 3D Modeling
Authors: Yi R , Xue MF
Published: April 2023

In order to avoid interference in NC milling process, a milling simulation design method of NC system based on 3D modeling technology is proposed. We use OpenGL technology and advanced object-oriented programming technology to perform a comprehensive object-oriented design of the NC milling simulation software system. On this basis, the tool motion parameters in the NC code are extracted and stored, the STL model is introduced as the data model of the machining object, and the interface mechanism between OpenGL and VC is provided. Finally, through the main interface of Visual C++ application program, the development of database and application system oriented to 3D end mill model is realized. The simulation results show that the method presented in this paper is more realistic for the establishment of the whole virtual milling machine profile, and it is suitable for general or more complex parts NC machining programming and simulation.
Modeling of the Mechanical Characteristics of the Prefabricated Cantilever Structure
Authors: Cao XX , Yin L , Peng C , Ryhuang  , Wu ZG
Published: April 2023

The prefabricated cantilever composite subgrade structure is a special and new type of structure suitable for the construction of mountain roads or the renovation and widening of old roads, but its related research is less. In order to reveal the mechanical response performance of precast cantilever composite subgrade structure, ABAQUS finite element software was used to model the mechanical response of such a unique structure. The results demonstrated that using a prefabricated structure and the integral modeling method increases the security of the tranverse displacement response of the column. The primary stress components of the constructed cantilever structure are not significantly affected by changes in steel plate thickness. The main load-bearing elements of the prefabricated cantilever structure are not significantly affected by changes in column concrete strength grade.
Optimization Design of Bolt-on Exhaust Hood for Fire Fighting Robot
Authors: OuYang LG , Wang G , Wang HY , Wang L , Huang F , Long TM
Published: April 2023

To solve the problem of frequent cracks in the air-cooled engine exhaust hood of a fire fighting robot, the structure parameters are optimized based on Beam element.Firstly,the finite element model of the exhaust hood is analyzed for pre-stress modal analysis, compared with the choice of Beam unit to simulate the bolted connection, and the RSM is used to optimize it.Secondly, the sample points are generated by Latin hypercube sampling, and the Kriging response surface model with good fitting is constructed. The sensitivity analysis is used to screen the targeted parameters, and the response surface optimization model with the total deformation, mass and first natural frequency as the target is established.Finally, MOGA is used to optimize the exhaust hood, and the optimal results are rounded and verified.The results show that the total deformation of the optimized exhaust hood is reduced by 7.18 %, the mass is reduced by 4.68 %, and the first natural frequency is increased by 74.98 %.The stiffness of the exhaust hood increases, which avoids the resonance interval. The application of Beam element effectively improves the simulation efficiency and provides a reference for the structural optimization of bolted connections.
Design of An Intelligent Manipulator Controlled by Gestures Based on FPGA
Authors: Li HN , Cong GT , Zhang XX
Published: April 2023

With the development of science and technology, manipulators are increasingly used in industrial production and daily life. The manipulator with traditional control mode has high requirements for operators, complicated operation, and human-computer interaction is inconvenient. In this paper, an intelligent manipulator system based on gesture control is designed. FPGA is used as the control core of the system. We apply the improved Canny algorithm processing, which can automatically recognize gesture information. After judgment, the control signal is sent to the manipulator to control the manipulator to complete the specified action. Through experimental testing, the system can successfully recognize all kinds of gestures, and can well control the manipulator to complete all kinds of actions. The human-computer interaction is more real, which greatly improves the intelligence of the manipulator system and helps to improve the work efficiency.
Power Optimization of UOWC-MIMO-OFDM System Based on PSO-WF Algorithm
Authors: Bai JR , Li N , Nie J , Liang XY
Published: April 2023

Under the constraint that the total transmission power is constant, when multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) technology is applied to the signal transmission design in the underwater optical wireless communication system (UOWC), the traditional water-filling algorithm (WF) uses mathematical derivation to solve the optimization problem, which requires multiple Lagrangian optimization solutions. In order to reduce the computational complexity and accelerate the convergence speed, a particle swarm optimization (PSO-WF) algorithm for water injection is proposed. It randomly selects particles in the target area, calculates the fitness, and gradually approximates the optimal solution to avoid negative power distribution. The simulation results show that, compared with the average power allocation scheme, the algorithm improves the system capacity and operation efficiency by about 80%; Compared with WF algorithm, it greatly reduces the complexity.
Temperature Control for Mass Concrete Construction of Wentang Bridge 5# Pier Pile Cap in Winter Construction
Authors: Sun ZY , Zhou JJ , Wang DM , Zhang J
Published: April 2023

In order to ensure the construction quality of mass concrete structures in winter, and avoid and prevent harmful temperature cracks of mass concrete, a calculation method of temperature field of hydration heat in winter based on finite element method is proposed in this paper. First, the three-dimensional finite element model of the temperature field of hydration heat is established; Then, the temperature variation of winter hydration heat temperature field of Wentang Bridge is calculated through experiments. The results show that the maximum measured temperature of the core point is 44.2 °C, and the corresponding calculated temperature is 53.7 °C. The maximum internal and external temperature difference measured is 24.7 °C, and the corresponding calculated temperature is 22.4°C. The research results prove that the calculation model can better simulate the concrete hydration process.
Big Data Preprocessing Approach for Smart Grid Based on Partial Order Reduction
Authors: Zhao LQ , Zhu JW , Zhang YH , Huang ZL , Li LC
Published: April 2023

In the age of big data, power grid data is characterized by large amount, fast speed and variable types. Traditional attribute reduction methods can no longer meet the needs of big data preprocessing. Therefore, this paper proposes a partial order attribute reduction method for power big data based on rough set. This method deeply analyzes the characteristics of the decision table, uses the parallelization algorithm to improve the attribute reduction algorithm, and effectively solves the efficiency problem in the computing process in the big data environment. Then it generates a series of MapReduce tasks corresponding to the generated Hive command, and obtains the decision rules through reduction. Finally, based on Hadoop platform, the incremental attribute reduction calculation of power fault data in certain area is designed according to the actual demand. The results show that the method has good performance in processing big data, and it can effectively process massive continuous power grid equipment monitoring data.
Ultrasonic Transducer-based Rebar Damage Monitoring Technology
Authors: Wang JY , Bu ZY , Qiu SL
Published: April 2023

In order to improve the accuracy of mechanical damage monitoring of steel bars, this paper proposes a method of mechanical damage monitoring of steel bars based on ultrasonic nondestructive testing technology. The influence of damage depth on ultrasonic was studied and analyzed, and the corresponding relationship between mechanical damage and ultrasonic characteristics was established. The test results show that the mechanical damage monitoring of steel bars based on ultrasonic nondestructive testing technology has higher accuracy and lower energy consumption and flexible installation.
Big Data Mining Analysis of Power Grid Based on Apriori Optimization
Authors: Zhao Liuqi , Feng Ziyan , Wang Ning , Zhu Jinwei , Li LinCheng
Published: April 2023

To ensure the safe and stable operation of the power grid system and strengthen the refined management level of the State Grid Corporation of China, a grid operation big data association analysis model based on Apriori association algorithm is proposed. This paper discusses the logic framework of the power big data platform, and describes the specific implementation from the functional architecture, technical architecture and other aspects. Aiming at the problem of massive heterogeneous power data and low sharing degree, the transaction matrix is pruned and compressed by setting the minimum support degree and establishing the frequent set matrix, and the implementation process of the improved algorithm on the MapReduce programming model of Hadoop platform is provided. Based on the research of Spark programming model, the improved algorithm is implemented in parallel style. The experimental results show that the efficiency of the algorithm after parallel processing has been greatly improved, which can also effectively improve the calculation amount and efficiency of power big data.
A Max-Min Scheduling Algorithm Based on TAS Mechanism
Authors: Guo J , Wang ZX , Wang HX , Cheng YZ
Published: April 2023

In order to solve the problem of too many guard bands and gate control lists (GCL) caused by time triggered (TT) flow scheduling per flow, this paper proposes a maximum minimum cycle scheduling algorithm based on time aware shaping (TAS) mechanism. At the same time, a period shift algorithm is proposed to overcome the excessive super period of TT flow. The results show that compared with the conventional scheduling methods, this method can ensure the deterministic transmission requirements of TT flows, and reduce the number of protection bands and GCLs.
MEMS-based Sensing Technology for the Gas Chromatograph Analysis
Authors: He Zilan , Hang Qingsha , Chen Baiquan , Chen Bangfa , Chen Sixiang
Published: April 2023

Device miniaturization based on MEMS technology is an important research direction in the field of MEMS. The gas chromatograph is a commonly used instrument for detecting complex gases, but due to its large size, high power consumption, and heavyweight, it is not convenient and cannot meet people’s needs for real-time, online, and rapid access to information. Therefore, the miniaturization of gas chromatographs combined with MEMS technology is a research trend. This paper first introduces the basic structure of the gas chromatograph. Then it studies the miniaturization of columns, detector miniaturization, and flow meter miniaturization based on MEMS technology, combined with cross-micro-nano scale integration technology to further improve sensitivity, and summarizes the prospects.
Research on HVDC Supplementary Two-Stage Transient Control and Smooth Switching
Authors: Hao Liangshou , Bai Leicheng , Peng Fukun , Lei Zhaoyu , Wang Di , Tang Li
Published: April 2023

HVDC additional transient control is an essential means to elevate the transient stability of AC/DC interconnected systems and the inevitable requirement of intelligent transmission. Two-stage transient additional control and a smooth switching strategy are proposed. By establishing an extended state observer for unbalanced power in the system disturbance, the real-time and accurate estimation of unstable power is realized, and an adaptive emergency power support controller is constructed. The mathematical model of the system is identified by using Total Least Squares-Estimation on Signal Parameters via Rotational Technique (TLS-ESPRIT). Based on the singular value reduction theory, the HVDC additional Active Disturbance Rejection Damping Controller (ADRDC) that can inhibit the low-frequency oscillation of the system is designed. Finally, two switching strategies are designed based on the change in the state of the network fault switch and the change in the power angle oscillation curve. The three-in-feed HVDC system is built in PSCAD, and the simulation analysis is carried out. The simulation results confirm the validity of the proposed method.
Numerical Simulation of Electrode Structure on High Voltage Pulse Discharge Characteristics
Authors: Zhang DongYang , Gao MingCheng , Guo Gang
Published: April 2023

For the study of the different electrode structures of the high voltage pulse discharge breakdown process of the insulating medium, the numerical simulation software is compiled to establish two kinds of the electrode structure of high voltage pulse discharge three-dimensional model, finite element difference method to simulate the expansion of plasma channel, the discharge characteristics of electrode structure internal voltage, and current of plasma channel and the impact of energy consumption. The simulation results show that, compared with the needle-needle electrode structure, the needle-plate electrode structure has a shorter time to reach the critical field strength of distilled water smaller breakdown voltage, shorter time to establish the discharge channel, smaller equivalent resistance, faster extension speed of the discharge channel, and less energy consumption for breakdown. And other conditions are the same. The results of this study can provide a theoretical reference for the structural design of high-voltage pulse-crushing electrodes.
Application and Research of High-Pressure Energy Storage Technology in Aircraft Hydraulic System
Authors: Gao Lei , Chen Tao
Published: April 2023

The power demand of the hydraulic system in a certain type of aircraft was analyzed. Within the current design of the hydraulic system, the instantaneous power shortage is inevitable in the launching stage. In order to achieve instantaneous high power and improve the performance of the aircraft, a new scheme in which a new type of pressure boost accumulator was applied as a power compensation device was suggested in this work. The accumulator volume was optimized and its effect on the system was investigated using the whole hydraulic system model implanted in AMEsim software. Based on the requirement of the weapon hatch, the parameters of the pressure boost accumulator were simulated and determined. The simulated results showed that the pressure boost accumulator could be low-power charged and output instantaneous high power to drive the weapon hatch. This new scheme can be applied to decrease the installed power of the hydraulic system.