Archive

16 February 2021, Volume 40 Issue 02 Previous Issue    Next Issue
---
Transport+Big Data and Artificial Intelligence
Transportation Infrastructure Engineering
Transportation Equipment


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

Transport+Big Data and Artificial Intelligence

Select

Ship Path Planning in Complex Water Areas under the Influence of Marine Meteorological Environment XIE Xinlian, LIU Chao, WEI Zhaokun 2021, 40(02): 1-7.  DOI: 10.3969/j.issn.1674-0696.2021.02.01 Abstract ( )   PDF (1645KB) ( )   In order to improve the economics and safety of ship automatic generation path in complex waters, a path planning algorithm with the shortest sailing time was designed by considering the factors of marine meteorological environment and the premise of avoiding obstacles. Based on the establishment of the environmental model, the improved MAKLINK graph was used to generate the feasible path. The influence of current, wind and wave on the ships speed was analyzed according to the vector synthesis and fitting model, and then the path weight was determined. Dijkstra algorithm was used for the initial path planning, and the improved particle swarm optimization algorithm was used to furtherly optimize and smooth the initial planning path. The effectiveness of the proposed algorithm was verified by a container ship passing through the planning sea area, and the sensitivity analysis of wind direction and scale was carried out. The results show that the generated path considering the marine meteorological environment can not only avoid obstacles safely, but also save the navigation time. The improved PSO algorithm can shorten the navigation time and improve the smoothness of the path. References | Related Articles | Metrics

Select

Highway Traffic Safety Evaluation Based on Unascertained Measure Theory HE Yulong, CHEN Bingshuo, GAO Pengwang, LIU Lei, CHI Jiaxin 2021, 40(02): 8-12.  DOI: 10.3969/j.issn.1674-0696.2021.02.02 Abstract ( )   PDF (464KB) ( )   Aiming at the problem that there were many influencing factors on highway traffic safety and it was difficult to quantify the evaluation, the unascertained measurement method was used to effectively evaluate the safety of highway driving. The unascertained measurement function was constructed by selecting indicators from four aspects such as weather, alignment, road surface and traffic conditions. The weight was calculated by the information entropy method, and the risk level was judged according to the confidence recognition criteria. Finally, the proposed method was applied to the study of highway traffic safety evaluation in Hunan Province. The research results show that the use of unascertained measurement theory can accurately evaluate the degree of danger of highway sections, which is reliable and applicable. The study can be used for reference for the highway traffic management department, and can promote the highway operation to be more safe and efficient. References | Related Articles | Metrics

Select

Lane Transgressing Risk Model of Electric Bicycle on Marking Separation Road Section LI Yan1, NAN Sirui2, HU Wenbin3, WANG Fan1, CHEN Kuanmin1 2021, 40(02): 13-20.  DOI: 10.3969/j.issn.1674-0696.2021.02.03 Abstract ( )   PDF (1335KB) ( )   In order to analyze the generation mechanism of lane transgressing behavior of electric bicycles, a lane transgressing risk model based on survival analysis was established to evaluate the lane transgressing risk of electric bicycles under various influence factors. The survival function, in which the lane transgressing speed was taken as an independent variable, was established to determine the interaction between lane transgressing speed and cumulative lane transgressing ratio. Kaplan-Meyer non-parametric regression was utilized to analyze the influence of the width of non-motorized vehicle lane and the traffic flow condition of adjacent motorway on lane transgressing speed respectively. COX proportional hazard model was established to obtain the relative risk value of electric bicycle transgressing lane under the above factors. Through the analysis of the measured data of roads with different widths and traffic flow conditions in Xian, the conclusion was drawn. The research results indicate that the lane transgressing risk can be represented by the speed of electric bicycles. The cumulative survival ratio drops rapidly from 71.2% to 16.4% while the speed increases from 20 km/h to 35 km/h. The widths of the non-motorized lane and the traffic flow condition of adjacent motorized lane have significant influence on lane transgressing speed. The risk of vehicle transgressing lane at road section of 260cm and 220cm non-motorized lane is 0.688 times and 0.859 times of 180 cm road, respectively. The risk of vehicle transgressing lane in free state is 2.445 times of that in non-free state, and that of high density non-motorized lane is 2.590 times of that in low density state. The conclusions can provide a theoretical basis for traffic design and traffic management in mixed traffic flow environment with electric bicycles. References | Related Articles | Metrics

Select

Driver Injury Severity in Truck Rollover Accidents Based on Mixed Ordered Probit Model LI Junhui1, TANG Zuogan2 2021, 40(02): 21-27.  DOI: 10.3969/j.issn.1674-0696.2021.02.04 Abstract ( )   PDF (460KB) ( )   In order to further study the influencing factors of driver injury severity in truck rollover accidents, the ordered Probit and mixed ordered Probit models were developed by considering the orderly features of driver injury severity and the heterogeneous effects of safety factors on driver injury severity. Based on 3 476 truck rollover accidents in Texas in 2016, 24 safety factors were selected as independent variables from the four factors of human, vehicle, road and environment, and driver injury severity was selected as dependent variable. The results show that male, drivers age, wearing safety belt, airbag deployment, alcohol or drug use, being thrown out of the car, driving not according to the specified lane, heavy truck, vehicle in right-turning, adverse weather conditions, road speed limit, and vehicles ex-factory age are significantly correlated with driver injury severity. In addition, the goodness of fit of the mixed ordered Probit model is higher than that of the ordered Probit model, and the mixed ordered Probit model founds that the influence of variables such as male, alcohol or drug abuse, being thrown out of the car and vehicle in right-turning on the driver injury severity has a heterogeneous effect. References | Related Articles | Metrics

Select

Function Structure Optimization System of Small Cities Road Network under New Urbanization FANG Song1, 2, MA Jianxiao1, HUANG Jing1 2021, 40(02): 28-34.  DOI: 10.3969/j.issn.1674-0696.2021.02.05 Abstract ( )   PDF (585KB) ( )   In order to adapt to the development needs of new urbanization and alleviate the traffic problems brought by it, the functional structure of road network was studied, which aimed to meet the diversified traffic travel needs of residents in small cities and realize the multiple functions of roads. The influencing factors and dividing factors of the functional structure of roads in small cities were discussed. The hierarchical functional structure of the road network in small cities was studied fro the macro perspective, and the section design parameters of the road network in small cities were optimized from the micro level. The functional structure optimization system of urban road network in small cities was put forward. The research results can provide reference for the planning and construction of urban road network in small cities under the background of new urbanization. References | Related Articles | Metrics

Select

Prediction of Highway Traffic Volume Based on Markov Chain-BP Neural Network Model PEI Tongsong1, PEI Yu2 2021, 40(02): 35-41.  DOI: 10.3969/j.issn.1674-0696.2021.02.06 Abstract ( )   PDF (914KB) ( )   Taking the highway traffic volume data of a region in Hebei Province from 1998 to 2017 as an example, BP neural network model was used to predict and Markov chain was used to correct the predicted value. The actual value of highway traffic volume was compared with the predicted value of BP neural network and the modified value of Markov chain, and the highway traffic volume data from 2018 to 2019 was predicted. The BP neural network prediction model modified by Markov chain can reduce the average relative error of highway passenger volume and freight volume to 2.07% and 2.14%, respectively. The modified model can not only accurately predict the road traffic volume, but also provide favorable opinions for the future development of highway transportation. References | Related Articles | Metrics

Select

Travelers Perception Differences of Travel Mode Service Attributes CHANG Sitie, YAN Fei, ZUO Kang 2021, 40(02): 42-46.  DOI: 10.3969/j.issn.1674-0696.2021.02.07 Abstract ( )   PDF (469KB) ( )   The analysis of travelers perception difference of service attributes can provide theoretical basis for improving the service level of urban public transport. Based on the preference survey of residents in Shanghai, the utility of travel mode choice considering the cross term of travel time and vehicle congestion as well as the reliability was established. Travelers perceived differences in travel mode service attributes were quantified according to the estimation results of generic parameters and option specific parameters of multinomial Logit and mixed Logit models. The results show that the time value of the crowded condition with seats is 1.41 times of that of the non-crowded condition with seats, and the time value of the crowded condition without seats is 1.56 times of that of the non-crowded condition with seats. The value of reliability of the metro is significantly higher than that of private cars and regular buses. Under the same level of congestion within the vehicle, the time value of regular bus is larger than that of the metro. References | Related Articles | Metrics

Select

Speed Guidance Strategy of Intelligent Connected Vehicle Platoon at Signalized Intersection SHI Qin, CHEN Hujiang, CHEN Yikai 2021, 40(02): 47-53.  DOI: 10.3969/j.issn.1674-0696.2021.02.08 Abstract ( )   PDF (1572KB) ( )   In order to reduce the fuel consumption of vehicles and improve traffic efficiency at intersections, the speed guidance strategy with fixed guidance time was proposed by taking the intelligent connected vehicle platoon as the guidance object. Considering the randomness of the initial speed and the number of vehicles in the platoon, Monte Carlo simulation was used to obtain the average fuel consumption and average travel time of a single vehicle. By constructing the comprehensive travel cost of the road section, two strategies of fixed guiding distance and fixed guiding time were compared. The research results show that: in the fixed guiding distance strategy, the comprehensive travel cost is the lowest when the guiding distance is 350 m; in the fixed guiding time strategy, the comprehensive travel cost is the lowest when the guiding time is 6 s. Compared with the two optimal schemes, the fuel consumption of the latter is 16.3% lower than that of the former, the travel time of the latter is 7.2% lower than that of the former, and the comprehensive travel cost of the latter is 10.2% lower than that of the former. The vehicle speed guidance strategy with fixed guidance time can effectively reduce vehicle delay at intersection and reduce fuel consumption. References | Related Articles | Metrics

Select

Revision of Urban-Rural Passenger Transport Integration Evaluation Model Based on Difference Coefficients ZHENG Shuni, BAI Hongyu, ZHOU Wenhua 2021, 40(02): 54-60.  DOI: 10.3969/j.issn.1674-0696.2021.02.09 Abstract ( )   PDF (473KB) ( )   The principle of difference was introduced into the evaluation of the integrated urban-rural passenger transportation service level, and 7 indicators were normalized through the TOPSIS model, including urbanization rate and permanent population of the town, etc. The distance value and closeness between each indicator and the ideal solution were calculated to determine the difference coefficients of different cities. Therefore, the evaluation model of urban-rural passenger transport integration development level was modified, and the case data was substituted into the model to verify the reliability of the model. Through the case analysis of five county-level cities, the results show that: the proposed model can objectively predict the level of urban-rural passenger transport integration, and fully considers the impact of urban economy, population and scale on the evaluation results, and can be applied to the comparison of urban-rural passenger transport integration development level between county-level cities. References | Related Articles | Metrics

Select

Study on Location Selection of Overloaded-Truck-Control-Station and Route Optimization of Enforcement Vehicle on Rural Roads JIANG Jinyu1, ZHAO Xu1, LI Chengyu1, YANG Zhongzhen2 2021, 40(02): 61-68.  DOI: 10.3969/j.issn.1674-0696.2021.02.10 Abstract ( )   PDF (2307KB) ( )   In order to reduce the damage of overloaded transport vehicles to rural roads, reduce the additional maintenance costs of rural roads due to overloading and guarantee the service quality of rural roads, the overloaded-truck-control-station was taken as the base to carry out mobile overload control on rural roads. In order to achieve the monitoring and overloading control of all overloaded road sections at the minimum cost, the cruise route optimization model based on the overloaded-truck-control-station was established, which determined the number and the location of overloaded-truck-control-station at the same time. Then a two-stage nested ant colony algorithm was designed to solve the location-routing problem with large-scale candidate point set and uncertain maximum number of settable facilities. A case study was carried out by using the actual data. The results show that: the overloaded-truck-control-stations are located in areas with abundant mineral resources and dense construction sites, where large trucks such as mineral trucks and slag trucks are often overloaded. The cruise routes of enforcement vehicles consist of several provincial and county trunk roads with large truck flow. References | Related Articles | Metrics

Transportation Infrastructure Engineering

Select

Damage Identification of Corroded RC Arch Based on Time Series Analysis:Simulation and Verification TANG Qizhi1, XIN Jingzhou1,2, ZHOU Jianting1, FU Lei1,3, ZHANG Jun4 2021, 40(02): 69-77.  DOI: 10.3969/j.issn.1674-0696.2021.02.11 Abstract ( )   PDF (5178KB) ( )   Aiming at the structural damage problem of RC arch bridge caused by steel corrosion, a method for damage identification of the corroded RC arch bridge based on time series analysis of acceleration data was proposed. Firstly, the mapping relationship between steel corrosion and structural stiffness degradation was established by considering the material deterioration factors such as steel corrosion. Secondly, with the help of ANSYS software platform, the finite element model of the deteriorated RC arch rib considering the initial stiffness damage was established and compared with the experimental data, and the effectiveness of the finite element simulation of the corrosion-damaged structure was verified. Then, based on the numerical model verified by experiments, the acceleration responses of RC arch under different damage conditions were obtained. After that, the time series model was established by using the acceleration response, and the ratio of the variance of the model residuals of the condition to be identified and the intact condition was taken as the damage characteristic index. The quantitative relationship between the corrosion rate and the damage characteristic index was obtained, and the calculation models for different reinforcement diameters were given. Finally, the measured data from the indoor model test were fed into the established quantitative relationship for prediction. The difference between the calculated results and the measured results is 2.86%, which further verifies the effectiveness of the proposed method. References | Related Articles | Metrics

Select

Experimental Research on Hysteresis Behavior of Prefabricated Concrete Beam-Column Joint with Steel End Connector RONG Xian1, 2, YANG Hongwei1, ZHANG Jianxin1, 2 2021, 40(02): 78-82.  DOI: 10.3969/j.issn.1674-0696.2021.02.12 Abstract ( )   PDF (3647KB) ( )   To solve the problem of the complicated connection of prefabricated concrete beam-column joints, the connection with steel end connector was proposed. Three prefabricated concrete beam-column joints with steel end connector, named ZGJ-1, ZGJ-2 and ZGJ-3, were designed. Through the low-cycle cyclic loading test, the influence of the web setting between the horizontal connecting plates and the length of the steel end extending into the precast beam on the hysteretic behavior of the joint was studied. The test results show that the new type of prefabricated concrete beam-column joints with steel end connector has good seismic behavior. The length of the steel end connector extending into the precast beam has little influence on the performance of the joints, and the setting of the web between the horizontal connecting plates can greatly improve the seismic behavior of the joints. References | Related Articles | Metrics

Select

Comprehensive Evaluation of Pavement Performance for Foamed Asphalt Cold Recycled Mixture CHEN Qian1, SONG Liang2, WANG Shuai1, WEN Penghui1 2021, 40(02): 83-88.  DOI: 10.3969/j.issn.1674-0696.2021.02.13 Abstract ( )   PDF (1567KB) ( )   In order to further evaluate the pavement performance of foamed asphalt cold recycled mixture, the pavement performance indexes of foamed asphalt cold recycled mixture with different foamed asphalt content were compared and analyzed. Six technical indexes were selected as evaluation indicators, which included splitting strength, strength rate of dry and wet splitting, dynamic stability, TSR, residual stability, and fatigue life. A pavement performance evaluation system for foamed asphalt cold recycled mixture was established based on efficiency coefficient method. The pavement performance of foamed asphalt cold recycled mixture was evaluated scientifically, and the optimal content of the foamed asphalt in the foamed asphalt cold recycled mixture was determined. The results show that the optimum foaming conditions of asphalt are as follows: the temperature is 155 ℃, the water consumption is 3.0%, and the optimum moisture content is 6.8%. The comprehensive evaluation system of pavement performance for foamed asphalt cold recycled mixture based on the efficiency coefficient method is more accurate and reliable. The total efficiency coefficients of the five schemes is in the order of A3＞A2＞A4＞A1＞A5.The pavement performance of foamed asphalt cold recycled mixture with foamed asphalt content of 3.0% is relatively better. References | Related Articles | Metrics

Select

Digital Image Differences of Paved Pavement at Different Heights ZHOU Jiankun1, CAO Yuanwen2, WEN Yongjie2, ZHAO Jiang1,BAI Liping3 2021, 40(02): 89-94.  DOI: 10.3969/j.issn.1674-0696.2021.02.14 Abstract ( )   PDF (3580KB) ( )   Digital image processing technology has the advantages of high efficiency, real-time, quantification and low cost, which provides a new research direction for asphalt pavement quality detection and evaluation. In view of the difference between the size of the actual area and the number of aggregate particles corresponding to different acquisition heights, the self-made image acquisition equipment was used to collect 20 pieces of asphalt mixture digital images under the image acquisition height of 50~100 cm. Through the regression analysis of the collected images at different heights and the actual corresponding pavement width, the functional relationship between the acquisition height and the actual road size corresponding to the image was proposed. And through the study on increase of aggregate particles over 9.5 mm and size accuracy in asphalt mixture binary image after the digital image preprocessing, the best image acquisition height was proposed. The research results show that:with the increase of image acquisition height, the actual road width of the corresponding area of the image increases proportionally. Based on the results of the increase of aggregate particles and the recognition accuracy of aggregate particles under different acquisition heights, the optimal image acquisition height range is determined as 70~80 cm. References | Related Articles | Metrics

Select

Excavation Face Stability of Slurry Shield Tunnel in Saturated Sand Layer JIANG Jiabing1, CHEN Zilong2, XU Tao3 2021, 40(02): 95-100.  DOI: 10.3969/j.issn.1674-0696.2021.02.15 Abstract ( )   PDF (1512KB) ( )   In the process of shield tunneling in saturated sand layer, improper support of excavation face may cause collapse or extrusion failure of excavation face. In order to ensure the stability of the excavation face, pressure mud was usually used to balance the earth pressure and water pressure on the excavation face. Because the mud pressure in the pressure chamber was greater than the hydrostatic pressure in the formation, the mud would infiltrate into the formation around the excavation face. In this case, part of the effective support force was transformed into excess pore water pressure, which caused the decrease of the effective support pressure on the excavation face, thus the stability of the excavation face was reduced. Therefore, the influence of slurry infiltration and excess pore water pressure must be considered in the design of support pressure. Furthermore, the stability of excavation face would also be affected by stratification. Combined with the calculation model of excess pore water pressure caused by shield tunneling in saturated sand layer and the results of indoor slurry infiltration test, the influence of slurry infiltration and excess pore water pressure on the stability of excavation face was analyzed, and the influence of stratum stratification and hydraulic gradient on micro stability of excavation face was discussed. The research results show that in the design of support pressure, additional pressure must be added to make up for the loss of effective support pressure in the process of mud infiltration. By comparing the hydraulic gradient on the excavation surface in homogeneous confined aquifer and semi-confined confined aquifer, it is found that the excavation face of shield tunnel in semi-closed confined aquifer is more stable than that in homogeneous confined aquifer. Without slurry support, the hydraulic gradient on the excavation face is difficult to maintain the stability of the soil particles on the excavation face. Therefore, it is suggested that the pressure slurry should be used for the support of the excavation face of shield tunnel in saturated sand layer. References | Related Articles | Metrics

Select

Tunnel Lighting Quality Based on Bright Color Pavement LI Zhiyong, HUANG Hua 2021, 40(02): 101-107.  DOI: 10.3969/j.issn.1674-0696.2021.02.16 Abstract ( )   PDF (3620KB) ( )   By using two kinds of bright-colored materials, such as Yuhua stone and tempered waste glass, 10 kinds of pavement schemes were drawn up to study the road performance and lighting energy-saving performance of tunnel pavement. The results show that: after embedding bright-colored material in asphalt mixture, although the water stability of asphalt mixture decreases slightly and the mass loss of the scattering is more than that of the ordinary AC-13, it can still meet the specification requirements, and the skid resistance is slightly improved. In addition,by using the self-developed tunnel simulation device,the 10 pavement schemes were evaluated and analyzed by brightness index and road reflection coefficients. It is found that the average brightness of tunnel pavement can be increased by 13%~20% by embedding tempered waste glass, and 7%~17% by adding light-colored Yuhua stone.The reflection coefficients increase with the increase of particle size and amount of bright-colored materials.Finally, an indoor model test of small target visibility and reaction time was used to study the effect of bright color pavement on tunnel lighting quality.It is found that replacing the 4.75 particle size grade paving scheme with bright color materials can not only effectively improve the average brightness of pavement, but also ensure the overall uniformity of pavement, and improve the tunnel lighting quality and tunnel driving safety at the same time. References | Related Articles | Metrics

Select

Risk Assessment of Anchorage Slope Instability Based on Improved Variable Weight-TOPISIS YE Xianfeng, HAN Yijiang, ZHU Chijie, CHENG Yong 2021, 40(02): 108-115.  DOI: 10.3969/j.issn.1674-0696.2021.02.17 Abstract ( )   PDF (1420KB) ( )   In view of the fact that different variable weight functions have different application scopes, when the decision-making evaluation object contains multiple sets of state values with large difference in configuration imbalance degree, the traditional variable weight function has low adaptability. A hybrid state variable weight function based on configuration imbalance degree and state value was established.In practical application, due to the division of excitation and punishment balance interval, the state value dispersion cannot accurately reflect the configuration imbalance, therefore, a measurement scheme of configuration imbalance degree was proposed based on the distance between the state value and the boundary of excitation and punishment balance interval. The TOPSIS method was combined with the improved variable weight function to form a variable weight evaluation model, which was applied to the risk assessment of anchorage slope instability based on multi-stage monitoring data.The research results show that the proposed variable weight evaluation model is suitable for the risk assessment of anchorage slope instability. Meanwhile, its variable weight adjustment degree and the configuration imbalance degree change direction can be completely consistent,which is more sensitive to the advantages and disadvantages.With higher applicability and better effect, the proposed model provides a reference method for decision evaluation with multiple sets of state values. References | Related Articles | Metrics

Select

Experiment Study on Effect of Different Filling Material on Dam-Break of Overtopping of Tailings Dam LIU Jie, LI Xuewei, MA Haiping 2021, 40(02): 116-122.  DOI: 10.3969/j.issn.1674-0696.2021.02.18 Abstract ( )   PDF (7217KB) ( )   The high titanium slag, mountain sand and river sand were used as filling material for tailings dam. Experiment and theoretic analysis method were applied to investigate the difference of dam break process of tailings dam filled with three different materials with the same gradation under overtopping action. The research results show that the final breach width of tailings dam filled with high titanium slag is the smallest and the erosion rate of the dam body is the lowest. In the process of dam break, the material loss rate and downstream flood sediment concentration rate of tailings dam filled with mountain sand and river sand are higher than those filled with high titanium slag. The ratio of cross-section average velocity to surface velocity is defined as the surface velocity coefficient k, and the breach discharge is indirectly affected by the influence of sediment concentration and breach size on the k value. The theoretical derivation shows that there is a minimum k value when the sediment concentration is between 0.05 and 0.15, and the k value increases with the increase of the breach size. References | Related Articles | Metrics

Transportation Equipment

Select

Performance Degradation Assessment of Rolling Bearings Based on Hidden Markov Model HAO Gang1, 2, JIN Tao1 2021, 40(02): 123-128.  DOI: 10.3969/j.issn.1674-0696.2021.02.19 Abstract ( )   PDF (1312KB) ( )   In order to identify and evaluate the changes of health status and performance degradation of rolling bearings in the whole life cycle, the Hidden Markov Model (HMM) was introduced. The Baum-Welch algorithm was used to model the vibration signal data of rolling bearing in whole life cycle, and Viterbi algorithm was used to solve and test the model. Finally, the Forward-Backward algorithm was used to calculate the probability distribution of the test data. The hidden sequence and observation sequence of the data probability distribution were verified to represent the state transition probability and performance degradation evaluation results respectively. The results show that the proposed method can quickly calculate the probability distribution of rolling bearing state transition, effectively identify the performance degradation state, and provide reference for preventive maintenance. References | Related Articles | Metrics

Select

Active Control of Straddle Monorails Pantograph-Catenary Coupling LIU Chaotao, DI Kehong, DU Zixue, YANG Zhen 2021, 40(02): 129-135.  DOI: 10.3969/j.issn.1674-0696.2021.02.20 Abstract ( )   PDF (1714KB) ( )   In the high-speed travel of monorail trains, the pantograph head often vibrates to impact the rigid catenary, which reduces the current collection quality and service life of the pantograph catenary. Therefore, an active control method for improving the pantograph-catenary relationship was proposed. On this basis, the linear two-degree-of-freedom dynamic model of monorails pantograph-catenary coupling system and the double-closed-loop control driving model of brushless DC motor were established respectively. Then the fractional-order PID control algorithm was combined to complete the modeling of the whole active control system. Finally, the response of the passive control and active control contact force of the pantograph and the lift of the pantographs head at different speeds of the train were compared and analyzed, and the response speed of the active control was also analyzed. The experimental results show that the response speed of the proposed active control method can fully meet the adjustment requirements of the pantograph-catenary relationship under high-speed conditions, and can significantly reduce the contact force fluctuation, reduce both collision and abrasion of pantograph-catenary as well as improve its service life. References | Related Articles | Metrics

Select

Iterative Sliding Mode Course Control Based on Segmented Double-Power Approach Law ZHAO Yuelin, MEN Maofeng, SUN Zhuang 2021, 40(02): 136-142.  DOI: 10.3969/j.issn.1674-0696.2021.02.21 Abstract ( )   PDF (697KB) ( )   A simple and efficient ship heading controller was designed by using the sliding mode variable structure control method. In order to solve the problem of slow convergence rate and strong chattering in the sliding mode variable structure controller method, a segmented double-power approach law was proposed. The mathematical verification shows that the convergence rate of the proposed reaching law is faster. At the same time,in order to keep the controller in the optimal state under the disturbance of unknown sea conditions,the RBF neural network was introduced to implement online estimation of the controller parameters to enhance the adaptability.The simulation results show that the segmented double-power approach law has obvious effect on reducing chattering and almost no chattering;the controller designed by the proposed method has stronger robustness to external wind and wave disturbance. References | Related Articles | Metrics