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13 April 2022, Volume 41 Issue 04 Previous Issue    Next Issue
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Transportation+Big Data & Artificial Intelligence
Transportation Infrastructure Engineering
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Transportation+Big Data & Artificial Intelligence

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Vessel Behavior Recognition and Trajectory Prediction Based on Multi-task Learning Model YANG Hong, HAN Peng, LIU Chang, GONG Shanshan 2022, 41(04): 1-7.  DOI: 10.3969/j.issn.1674-0696.2022.04.01 Abstract ( )   PDF (1181KB) ( )   To solve the difficulty of vessel behavior recognition and trajectory prediction in complex marine environment, a model based on multi-task learning was proposed. The convolutional neural network (CNN) was connected in parallel with the bidirectional long short-term memory (BiLSTM) optimized by the attention mechanism as a training network, to complete the missions of vessel behavior identification and trajectory prediction at the same time. Vessel automatic identification system (AIS) was selected to provide data base. The research results show that the proposed method has higher prediction accuracy and identification accuracy. It can effectively assist the supervision work of maritime supervision. Meanwhile, the idea of multi-task learning provides a new idea for the study of maritime intelligent transportation. References | Related Articles | Metrics

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Cargo Handling Capacity of the Three Gorges Ship Lock Based on Ship Tonnage Change DING Tao, ZHANG Naiyu 2022, 41(04): 8-12.  DOI: 10.3969/j.issn.1674-0696.2022.04.02 Abstract ( )   PDF (1755KB) ( )   The current situation and existing problems of the cargo handling capacity of the Three Gorges ship lock were analyzed. According to the arrival quantity of ship and the capacity of ship passing through the lock at one time considering the weight, the simulation model of ship type passing through the lock was established with Anylogic software, and the maximum cargo handling capacity of the Three Gorges ship lock was calculated. The results show that the influence factors of the cargo handling capacity of the Three Gorges ship lock are mainly concentrated in three aspects such as ship lock, ship and ship lock operation organization, which specifically means the type of cargo ship passing the lock, the actual load rate of cargo ship passing the lock, the operation and management mode of the lock and the tonnage limit threshold of ship passing the lock. The proposed simulation model predicts that the maximum cargo handling capacity of the Three Gorges ship lock is 179 million tons. References | Related Articles | Metrics

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Optimization of Straight-Going Multi-berth Bus Station Setting Considering Motorized and Non-motorized Vehicles Conflict LI Yingshuai, MA Zechao, ZHANG Yichao, WANG Weiqiang, LIU Zhenjiang 2022, 41(04): 13-18.  DOI: 10.3969/j.issn.1674-0696.2022.04.03 Abstract ( )   PDF (1846KB) ( )   The problem of motorized and non-motorized vehicles conflict around bus stations has seriously reduced the efficiency and safety of bus stations. Taking the conflict rate as an evaluation index, an optimization plan for the setting of bus stations was proposed. A total of more than ten bus stops in Changzhi, Suzhou, and Jinchang were selected for investigation. Taking the length of bus station, the width of adjacent non-motorized lanes, the speed of non-motorized vehicles and the daily traffic volume of adjacent motorized lanes as independent variables and taking three types of motorized and non-motorized vehicles conflict rate as dependent variables, the multiple regression equation was fitted. A conflict prediction model was established. The conflict rate was predicted based on the setting form of bus stops and the traffic operation characteristics in the area. The research results show that the motorized and non-motorized vehicles conflict rate is linearly correlated with the four independent variables, and the bus stop setting is optimized with the conflict rate as the constraint condition. References | Related Articles | Metrics

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Multi-parameter Coordinated Control Method for Intersections with Large Capacity Gaps DING Baiqun1, YANG Liu1, XU He2, LUO Lizhen3 2022, 41(04): 19-26.  DOI: 10.3969/j.issn.1674-0696.2022.04.04 Abstract ( )   PDF (2159KB) ( )   In order to reduce the risk of queuing overflow on the secondary road at the intersection under oversaturation where the capacity of the primary and secondary roads were extremely disparity, reduce the adverse effects caused by long queues of vehicles on the secondary road, and comprehensively balance the multi-objective requirements such as priority of the main road, queuing restrictions, and delay on the secondary road, the secondary road red light terminal queuing model, road remaining capacity model and multi-parameter coordinated signal control model were established. And multi-objective genetic algorithm was used to optimize this solution. A case study shows that the multi-parameter coordinated control method slightly increases the overall delay of the intersection and the queuing length of the main road. However, the delay of the secondary road has been decreased by about 17%, and the queue length has been decreased by about 30%~50%. The proposed control method can make full use of the capacity of the main road to control the queuing length on the secondary road, and effectively reduce the risk of secondary road queue overflow blocking the traffic operation of the local road network. Comprehensively balancing the traffic demand of primary and secondary roads, a reference control method is proposed to deal with the transfer of main traffic contradictions under the oversaturation state of road intersections with large capacity gaps. References | Related Articles | Metrics

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Traffic Credit Rating Method Based on Combined Objective Weighting Method XU Wangtu1, WEN Yanjie2 2022, 41(04): 27-32.  DOI: 10.3969/j.issn.1674-0696.2022.04.05 Abstract ( )   PDF (1026KB) ( )   In order to solve the problem of traffic credit rating, the transportation enterprises were reasonably graded based on combined objective weighting method. The composition of traffic credit rating indexes was analyzed. The credit score of transportation enterprises was obtained by combining the combined objective weighting method with the continuous 3-sigma criterion, and the credit of transportation enterprises was rated by the interval 3-sigma criterion. The credit-related index data of various transportation enterprises in Xiamen was taken as an example to analyze the performance of the algorithm. The research results show that the enterprise supervision inspection (cs) has the largest weight. For the enterprise reputation evaluation index, its weight decreases with the decline of its reputation level. References | Related Articles | Metrics

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Ranking of Road Traffic Risk Network Based on Improved TOPSIS DAI Jianyong1,2, HUANG Xiaoqing1, WANG Wenwen1 2022, 41(04): 33-39.  DOI: 10.3969/j.issn.1674-0696.2022.04.06 Abstract ( )   PDF (1326KB) ( )   Studying and ranking the risk importance of highway traffic accidents is of great significance for improving the efficiency of risk control and reducing the repetition of traffic accidents. In order to obtain a comprehensive and objective ranking of risks, firstly, the human factors analysis and classification system (HFACS) model was applied to determine the road traffic safety risk and classification, and the road traffic risk network model was constructed. Then, taking network centrality as the index, an improved TOPSIS method (PPR-TOPSIS) was established to comprehensively rank the risks in the network. The proposed method was used to analyze the “6.29” major road traffic accident in Hengyang section of Beijing-Hong Kong-Macao Expressway and compared with entropy weight TOPSIS method. The results show that the influence of fatigue driving on the accident is maximum, whose closeness is more than 80%; and the influence of supervision and management factors of both enterprises and TBA is relatively larger, whose closeness is more than 50%. And PPR-TOPSIS method is more comprehensive and accurate, which is more suitable for major traffic accidents. References | Related Articles | Metrics

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Urban Rail Transit Operation Risk Assessment in Chongqing under COVID-19 ZHANG Shangyi, ZHOU Mina, ZHENG Xianyong 2022, 41(04): 40-45.  DOI: 10.3969/j.issn.1674-0696.2022.04.07 Abstract ( )   PDF (2207KB) ( )   A risk assessment system was constructed based on four major risks: operation risk, emergency management risk, passenger risk and public safety management risk. The Bayesian network model was used to carry out forward and reverse inference on the risks of urban rail transit operation in Chongqing under COVID-19, and the reverse correlation between risk nodes was calculated. The risk of urban rail transit operation in Chongqing under COVID-19 was evaluated. The results show that: in the middle and later stage of COVID-19, the overall risk Z of urban rail transit operation in Chongqing is at a general level; when Z is at high risk and the probability P(Z|Z=high) is large, operation risk and emergency management risk are the main risks; when P(Z|Z=high) increases from 0% to 100%, operation risk has the greatest impact on Z among the four risks. References | Related Articles | Metrics

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Evaluation of Rural Roads Maintenance and Management Performance Based on BSC-FAHP and Grey Clustering Evaluation Model LI Hailian1,2, LIN Wangdong1, LIN Mengkai1,2, MA Ziyuan1 2022, 41(04): 46-53.  DOI: 10.3969/j.issn.1674-0696.2022.04.08 Abstract ( )   PDF (1932KB) ( )   Scientifically evaluating rural road maintenance performance has become an important problem to be solved in rural road maintenance and management. The performance evaluation index system and the hierarchical structure of rural road maintenance management was established by using balanced card theory. A fuzzy analytic hierarchy process (FAHP) was proposed to improve the weight calculation method of the performance evaluation index of the rural road maintenance management. Through the sensitivity analysis, the proposed method was proved to be robust. A grey cluster model of rural road maintenance performance evaluation was established. The rural highway maintenance management performance evaluation level was determined according to maximum membership principle. The proposed model was applied to comprehensively evaluate the maintenance management performance of a rural road maintenance station in Liangzhou District, and the feasibility of the proposed method in the performance evaluation of nural road maintenance and management was verified. The results show that the proposed evaluation method can evaluate the performance of rural road maintenance and management objectively and effectively, which has good applicability and reliability, and can be well applied to the performance evaluation of rural road maintenance and management. References | Related Articles | Metrics

Transportation Infrastructure Engineering

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Test and Simulation Study on Bonding Performance of Post-Tensioned Steel Strand ZHAO Shaowei1, ZHANG Jiahe1, GUO Rong1, ZHEN Zhichao2 2022, 41(04): 54-62.  DOI: 10.3969/j.issn.1674-0696.2022.04.09 Abstract ( )   PDF (2324KB) ( )   The bonding performance of post-tensioned bonded prestressed steel strand and grouting was studied. Based on two groups of pull-out tests of steel strands, the bond slip constitutive relationship of steel strands in bellows under grouting defects was established. The bond between steel strands and grouting was simulated by using nonlinear Spring 2 element of ABAQUS. Two groups of pull-out tests were simulated and analyzed. The research results show that the larger the diameter of the bellows and the thickness of the protective layer, the greater the bonding strength of the specimen and the greater the axial stress of the steel strand. The longer the bonding length is, the bonding strength and axial stress of steel strand first increase and then decrease. The stress at any position of the steel strand increases linearly with the load, and the axial stress distribution of the steel strand decreases linearly from the drawing end. The bond strength decreases linearly with the increase of grouting defect; the stress of steel strand is the same everywhere where there is grouting cavity. References | Related Articles | Metrics

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Performance-Based Rapid Evaluation Method for Seismic Resilience of Bridges LIU Jun, XU Xin, SHEN Fengjun 2022, 41(04): 63-69.  DOI: 10.3969/j.issn.1674-0696.2022.04.10 Abstract ( )   PDF (1897KB) ( )   According to the second generation of performance-based structural seismic design theory, the multi-dimensional evaluation of structural seismic performance can be realized by analyzing structural performance, seismic resilience and sustainability. As the key node of the transportation line, bridges are easily damaged under the earthquake, which causes the interruption of life transportation line. Therefore, people pay more and more attention to the seismic resilience of bridges after earthquake. A performance-based rapid evaluation method of bridge recoverability after earthquake was proposed, and the seismic resilience of a medium span prestressed concrete continuous beam bridge was evaluated. The research results show that: the seismic resilience curve of bridge system established by the proposed evaluation method can effectively realize the rapid evaluation of bridge seismic resilience. Considering the seismic fragility and damage reinforcement method of bridge components, the research results have certain engineering value for bridge maintenance decision-making after earthquake. References | Related Articles | Metrics

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Asphalt Performance Evaluation Exposed to the Sulfate Attack and Freeze-Thaw Cycles XIONG Rui1,2, FENG Baozhu1, QIAO Ning1, JI Kuo1, WANG Haoyu1 2022, 41(04): 70-75.  DOI: 10.3969/j.issn.1674-0696.2022.04.11 Abstract ( )   PDF (3031KB) ( )   In order to investigate the influence of salt freeze-thaw cycles on asphalt performance, under the condition of rapid freezing and thawing test with different concentration of sulfate solution, the cone penetration test, bending beam rheological test (BBR) and pull-off test were used to investigate the variation of the shear strength, low temperature performance and the adhesion between asphalt and aggregate. By means of scanning electron microscope (SEM) and fourier transform infrared spectroscopy (FTIR) testing method, the mechanism of sulfate deterioration of asphalt mortar was explored. The results show that as the concentration of salt solution increases, the shear strength increases, the low-temperature rheological property decreases, the adhesion of asphalt and aggregate deteriorates and salt has a certain hardening effect on asphalt. Freeze-thaw cycles further aggravates salt erosion. There is no obvious change in the main absorption peak of sulfate asphalt mortar, and the salt-asphalt interface is dominated by physical action during the test age. The dissolution and crystallization process of sulfate particle and its salt aging effect are the main causes of performance deterioration of asphalt mortar. References | Related Articles | Metrics

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Strength Characteristics Analysis of SRX Polymer Graded Crushed Stone HE Lihong1, MA Yuefan1, DENG Wen1,2, ZHU Hongzhou1, HAO Zengheng3 2022, 41(04): 76-80.  DOI: 10.3969/j.issn.1674-0696.2022.04.12 Abstract ( )   PDF (978KB) ( )   SRX polymer is a kind of stabilizer for flexible base material. The best moisture content and maximum dry density of SRX polymer graded crushed stone were determined by heavy compaction method. Taking the California bearing ratio (CBR) value as the strength evaluation index, the influence law of grading type, SRX polymer content, curing age and relative water content on the strength of SRX polymer graded crushed stone was analyzed. The results show that the JG CBR value of dense grade is higher than that of intermittent grade GM, and increases with the increase of SRX content and curing age. The indirect tensile strength increases with the increase of SRX polymer content. Meanwhile, the variation law of relative water content “Δω” and the relative strength Rbubble/Rdry is obtained and the functional relationship between them is given. References | Related Articles | Metrics

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Correlation between Medium Fluidity Concrete Workability and Mortar Rheological Properties NAN Xueli 1,2, LI Rongyang 1,2, JI Jianrui1,2, WANG Yi1,2, CHEN Hao1,2 2022, 41(04): 81-86.  DOI: 10.3969/j.issn.1674-0696.2022.04.13 Abstract ( )   PDF (2420KB) ( )   Based on residual slurry film thickness theory and mortar rheological threshold theory, the mortar rheological test and concrete slump flow test were used to study the correlation between the workability of medium fluidity concrete and its equivalent mortar rheological properties, so as to achieve the purpose of predicting and adjusting the workability of medium flow concrete through the rheological properties of mortar. The research result show that the volume of coarse aggregate in 1 m3 concrete decreases with the increase of mortar film thickness, and when the gradation curve, apparent density and vibration density of coarse aggregate are constant, the excess mortar film thickness and coarse aggregate volume meet the relationship of quadratic function. The mortar rheological threshold theory of self-compacting concrete has good applicability in medium fluidity concrete, and the theoretical model can be used to guide the rheological research of medium fluidity concrete. When the physical properties and dosage of coarse aggregate are determined, the workability of medium fluidity concrete and the rheological properties of its equivalent mortar have good correlation. The workability of medium fluidity concrete can be predicted or adjusted by testing the rheological properties of mortar. References | Related Articles | Metrics

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Macro-micro Study on Arch Expansion of Cement Stabilized Gravel Material in Desert Area with Large Temperature Difference WANG Xuancang1, ZHU Shiyu1, ZHANG Mengyuan1, SONG Liang1,2, ZHANG Xiaoyue1 2022, 41(04): 87-95.  DOI: 10.3969/j.issn.1674-0696.2022.04.14 Abstract ( )   PDF (3011KB) ( )   In order to explore the factors influencing the arch expansion of asphalt pavement of cement stabilized base in large temperature difference desert area, based on south Xinjiang climate temperature difference and cement stabilized gravel component materials, an arch expansion test of cement stabilized base material was conducted. The arching deformation of water stabilized gravel specimens with different gradation types, different cement dosage, different sulfate content and different environmental humidity was simulated. The arch expansion performance and change law of cement stabilized base material under different factors were clarified, and the reasonable range of each design index was given. Moreover, combined with modern electron microscope scanning technology and industrial CT, and the development mechanism of internal arching of water stabilized gravel material was further revealed. The research results show that, under different temperatures, the expansion coefficient of water-stabilized sand and gravel material with skeleton void structure is the smallest, followed by that of skeleton dense structure, and the expansion coefficient and expansion amount of the specimen formed by suspended dense structure are the largest. The increase of cement dose is positively correlated with the expansion amount of water-stabilized sand and gravel mixture. In the process of heating up, low salt content and environmental humidity have no significant effect on the expansion amount of the specimen. When the sulfate content reaches 0.8%, the salt swelling effect is initially reflected. In the temperature range of 30~40 ℃, the arch expansion reaction of the specimen is the most severe. It is suggested to adopt skeleton pore gradation structure in desert area with large temperature difference and the appropriate cement dose is 4%. References | Related Articles | Metrics

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Ecological Slope Protection Technology of Wengma Railway Slope in Guizhou WANG Linfeng1, WU Fayou1, ZENG Taorui1, CHENG Ping1, HU Cailong2 2022, 41(04): 96-104.  DOI: 10.3969/j.issn.1674-0696.2022.04.15 Abstract ( )   PDF (1951KB) ( )   Relying on the slope vegetation restoration project of Wengma Railway in Guizhou, in order to select plants and substrates suitable for the area, the plant species and soil composition along the railway of the project were investigated. The trial cultivation experiments of single plant planted in different substrates and plants with different ratios planted in different substrates were carried out in the laboratory. The water retention of substrates with different ratios, the growth height of plants with different ratios, the germination rate of seeds and the shear strength of soil after the test were analyzed. The optimal substrate ratio and the best plant ratio in the experiment were selected by introducing AHP and multi-factor criterion method. Through research, it is concluded that the substrate ratio with 3% water-retaining agent, 4% vermiculite and 1% fertilizer is most suitable for plant germination, and the substrate ratio with 4% water retaining agent, 5% vermiculite and 1.5% fertilizer is most suitable for plant growth. The best combination of single plant is American ever spring and the substrate ratio with 4% water retaining agent, 5% vermiculite and 1.5% fertilizer. The best combination of mixed plants is the seed ratio of Bahia grass, green bristlegrass, clover and ryegrass and the substrate ratio with 4% water retaining agent, 5% vermiculite and 1.5% fertilizer. The shear strength of mixed plants is greater than that of single plant. Due to the different lengths of roots and whiskers of the mixed plants, the soil is combined more closely, and the shear strength of the soil is increased. References | Related Articles | Metrics

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Influence of Urban Spiral Tunnel Group Excavation on Adjacent Buildings GAO Feng1, WU Jiaxin1, SHI Longfei1, JIA Shan2, HE Jiang1 2022, 41(04): 105-112.  DOI: 10.3969/j.issn.1674-0696.2022.04.16 Abstract ( )   PDF (1425KB) ( )   The construction of urban underground long-span multi-storey overlapping tunnel will pass through or approach many existing structures, and its failure mode, load distribution and interaction between tunnels are very complex. Based on the project background of Chongqing Jiefangbei underground parking garage and connecting channel phase III, the impact of spiral tunnel group construction on surrounding rock and surface buildings was studied through finite element numerical simulation, qualitative and quantitative analysis method. Moreover, through the comparative analysis of on-site monitoring data, the alignment scheme of tunnel group and the optimal excavation sequence and excavation method were determined, which provided reference and guidance for similar projects. References | Related Articles | Metrics

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Development of Instantaneous Mapping System of Local Scour Topography around Pile Groups Foundation NI Fei1, CHEN Hong2, LUO Yunfeng3, ZHU Qing1, WANG Haocheng1 2022, 41(04): 113-119.  DOI: 10.3969/j.issn.1674-0696.2022.04.17 Abstract ( )   PDF (1556KB) ( )   The conventional measuring equipment and methods of three-dimensional underwater terrain cannot achieve instantaneous rendering of the entire underwater terrain around the wading structure in the model experiment. As a result, there is almost no detailed study on the development characteristics of local scour around bridge pile group foundation. Therefore, a real-time surveying and mapping system for the scouring and silting terrain around the wading structures in the river engineering model experiment was developed. The design parameters of real-time surveying and mapping system were quantified. Based on the above, the dynamic development characteristics of local scour around pile group foundation changing with time were studied. The research results show that the surveying and mapping system can realize dynamic real-time mapping of the whole process of local scouring development of pile group foundation, with high efficiency and small error. During the local scouring development, under the combined action of the three-dimensional vortex system, the riverbed upstream of the pile group foundation first appears scouring, and the scouring development is faster than that downstream; the scouring depth and scope are also larger than those in the downstream, and the scouring pit will develop to the upstream and downstream at the same time. Moreover, the scouring develops rapidly upstream and slowly downstream, and the limit scouring depth appears outside the pile group foundation near the upstream surface. References | Related Articles | Metrics

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Application of Multi-source Remote Sensing Technology in Geological Route Selection of Expressway in Complex Mountain Area LI Shengfu, XIANG Bo, SUN Xiaopeng, XU Hongbiao, WANG Zhiheng 2022, 41(04): 120-125.  DOI: 10.3969/j.issn.1674-0696.2022.04.18 Abstract ( )   PDF (3889KB) ( )   As expressways extend into complex mountainous areas, rapid and effective identification and analysis of geological hazards are needed to avoid large harmful geologic body that affects highway safety. Limited to complex terrain and geological conditions, traditional surveying and surveying methods were difficult to achieve this goal. The multi-source remote sensing technology was used to identify and analyze the large deformation bodies affected by the reconstruction of the Jinsha River bank along the Xinchanggou along the G4216 Yangjiang Expressway. Firstly, based on the high-precision DEM data obtained by LiDAR, supplemented by high-resolution remote sensing images, the boundary and surface crack characteristics of the deformed body were obtained. Then, InSAR technology was combined with the water level data of the hydropower station to obtain the deformation development law of the deformed body. Through the application analysis of multi-source remote sensing technology, it is concluded that the deformable body is large in scale, which has a wide range of influence and is continuously deformed currently. And a safe distance for highway to avoid is also proposed. References | Related Articles | Metrics

Transportation Equipment

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Case Study on Accident Caused by Loss of Tail-Rotor Effectiveness WANG Chang1,2, CHENG Meng3, MA Shuai2 2022, 41(04): 126-132.  DOI: 10.3969/j.issn.1674-0696.2022.04.19 Abstract ( )   PDF (3456KB) ( )   The tail rotor is a vital component for balancing the main rotor counter torque and enabling directional control of the helicopter, and loss of tail rotor effectiveness (LTE) is one of the significant factors that threaten helicopter flight safety. Several flight accidents caused by LTE were combed and summarized, the definition of LTE and the aerodynamic mechanisms thereof were briefly introduced, and the specific causes of accidents were analyzed deeply from the aspects of environmental factors and flight personnel operation factors. The results reveal that LTE mainly occurs in the low-speed flight stage of helicopter and is susceptible to the influence of environmental wind. Finally, suggestions for the prevention of LTE and the coping strategies when LTE occurs are proposed. References | Related Articles | Metrics

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Curve Trafficability of a Novel Straddle Type Monorail Vehicle with Double-Axle and Wide-Wheelbase DU Zixue, LI Yunlong 2022, 41(04): 133-138.  DOI: 10.3969/j.issn.1674-0696.2022.04.20 Abstract ( )   PDF (2664KB) ( )   The structure of a novel double-axle wide-wheelbase straddle monorail vehicle bogie was obviously different from that of the current vehicle bogie, which was shown in the following aspects: the transverse wheelbase of the running wheels was large, the running wheels were connected by differential structure, and there were guide wheels and no stable wheels. Through the research and analysis of its curve trafficability, the rationality of the new bogie scheme was confirmed. The radial force of the guide wheel, the vertical force of the running wheel, the rolling angle of the car body, the steering moment, the cornering angle of the running wheel and the overturning coefficient were taken as the evaluation indexes of the curvilinear trafficability, and the dynamic model of straddle type monorail vehicle based on the structural characteristics of the new bogie was studied and constructed. On this basis, the proposed curve trafficability was analyzed and compared with the current monorail vehicle curve trafficability. The research shows that the new type of straddle monorail vehicle with double-axle and wide-wheelbase has good curve trafficability, and the bogie structure innovation is effective. References | Related Articles | Metrics

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Improved Approach Law Sliding Mode Control for Permanent Magnet Synchronous Motor Based on Fuzzy Neural Network Optimization HU Qiguo1, WANG Zelin1, CAO Lijie2, ZHANG Jun1 2022, 41(04): 139-144.  DOI: 10.3969/j.issn.1674-0696.2022.04.21 Abstract ( )   PDF (1070KB) ( )   In order to improve the performance of permanent magnet synchronous motor sliding mode control system, a fal function was used to replace the traditional symbolic function, which was based on the traditional exponential approach law sliding mode control. And an improved exponential approach law was designed, and its stability was verified by Lyapunov function. Then, the parameters of the improved exponential approach law were dynamically optimized by fuzzy neural network, and the sliding mode speed controller of permanent magnet synchronous motor was designed. Through simulation analysis, the results show that: compared with the traditional exponential approach law, the improved exponential approach law reduces the overshoot by 67.1%; the speed drop amplitude under load disturbance is reduced by 22.2%, and the speed recovery time is shortened by 0.01s. The improved exponential approach law optimized by the fuzzy neural network further reduces the overshoot by 50%; the speed drop amplitude under load disturbance is reduced by 8.9% again, and the speed recovery time is shortened by 0.0032s again. References | Related Articles | Metrics