Archive

19 June 2021, Volume 40 Issue 06 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

Driving Style Recognition Method Based on iForest and Bisecting K-means Combined Algorithm DENG Tianmin1, ZHU Jie2, ZHU Kaijia1, QU Zhihua3 2021, 40(06): 1-6.  DOI: 10.3969/j.issn.1674-0696.2021.06.01 Abstract ( )   PDF (799KB) ( )   A driving style recognition method for passenger drivers based on iForest and Biscting K-means model was proposed. In order to solve the problem that the clustering centroid seriously affected the clustering results in the Bisceting K-means model, the iForest was adopted to train the candidate set of clustering centers as the clustering centroid set. Through the investigation of 30 professional bus drivers on an intercity passenger line, the proposed model was verified by about 4 million bus driving data in more than 90 days under the straight road driving condition. The experiment shows that when the standard deviation of acceleration and overspeed tendency coefficient are used as clustering indexes, the driving styles of these 30 drivers cluster into three categories: cautious, ordinary and aggressive, among which 11 are cautious, 19 are ordinary and no aggressive. References | Related Articles | Metrics

Select

Identification of Road Section Congestion Influence Based on Bijective Soft Decision Theory XU Maozeng, ZHANG Li 2021, 40(06): 7-11.  DOI: 10.3969/j.issn.1674-0696.2021.06.02 Abstract ( )   PDF (4503KB) ( )   In order to describe the impact of road section on the overall traffic, the congestion influence index and its calculation method were proposed, and a computing framework based on bijective soft decision theory and real-time road map data was established. Taking the Baidu real-time traffic map of Chongqings Four-Kilometer Interchange from December 9 to 31, 2018 as the sample sequence, a case study was carried out. The results show that the congestion influence index can be used to describe the important attributes of urban road traffic state; and through the discrete traffic state information in the real-time road map, the analysis framework of the bijective soft decision theory can quickly obtain the influence of road congestion, which can be used as a powerful supplement to identify the severity of road section congestion. References | Related Articles | Metrics

Select

Traffic Capacity of Urban Intersection under the Conditions of Mixed Release of Traffic Flow BAI Han, ZHANG Kangyu, WANG Xiuguang, YAN Xiang, FENG Qilong 2021, 40(06): 12-20.  DOI: 10.3969/j.issn.1674-0696.2021.06.03 Abstract ( )   PDF (1471KB) ( )   A calculation method for traffic capacity at intersections is a basic condition of urban congestion control. In view of the mixed release of traffic flow at urban road intersections, first of all, combined with the characteristics of traffic flow in all directions, it was clear that the traffic flow had the basic attributes of mixed release between signal control and nonsignal control. Secondly, the law of the conflict of traffic entities was applied and the concept of the complex coefficient of traffic conflicts and its traffic capacity reduction method were proposed under the mixed release of traffic flow. And the traditional traffic capacity theory was analyzed by analogy to obtain the traffic capacity calculation method of straight and rightturning directions. Thirdly, referring to the theory of crossing gap, the compensation benefit of left turn vehicles was introduced, and the capacity calculation method of left turn direction was obtained. Furtherly, a basic traffic capacity calculation model for common lane layouts was established. Finally, VISSIM was applied to obtain data and calibrate the reduction coefficient, so as to build a comprehensive calculation model for the capacity of the mixed release of traffic flow at intersections. The verification indicates that the calculated traffic capacity of the proposed model is basically consistent with the actual traffic capacity, with an average error of 4.9%, which better reflects the actual situation of the mixed release of traffic flow at intersections in China. References | Related Articles | Metrics

Select

Short-Term Traffic Flow Adaptive Prediction Model Based on FFOS-ELM and PF WANG Tao1, XIE Sihong1, LI Wenhao1,2, LI Wenyong1 2021, 40(06): 21-27.  DOI: 10.3969/j.issn.1674-0696.2021.06.04 Abstract ( )   PDF (1401KB) ( )   In order to improve the accuracy of short-term traffic flow prediction, an adaptive traffic flow real-time prediction model was proposed based on the forgetting factor extreme learning machine (FFOS-ELM) and particle filtering (PF). Firstly, the forgetting factor was introduced and the extreme learning machine with a forgetting factor was deduced. In addition, to avoid the influence of early data on prediction accuracy due to the time-varying of traffic flow, the parameters of the prediction model were updated in real time by an incremental learning method. Secondly, particle filtering was used to eliminate the influence of random noise on prediction accuracy. Through iterative calculation, the optimal estimation and prediction ability of the system state were achieved to improve the prediction accuracy of future traffic flow. Finally, the detector data of a trunk road in Guilin were used for simulation. The predicted results were compared with those of the online models such as the basic extreme learning machine, the forgetting factor extreme learning machine, and the those of offline models such as time series (ARIMA), support vector machine (SVM), long-short term memory neural network (LSTM). The results show that the prediction error index of the proposed adaptive prediction model drops significantly, and the mean square error variation dimension drops to between 0 and 2.5. The traffic flow fitting situation in the whole road segment of the proposed model and its specific prediction accuracy are effectively improved. References | Related Articles | Metrics

Select

Mining Method of Key Nodes of Urban Road Network Based on Spatial-Flow Degree ZHANG Cheng1, WANG Chengyin1, CHEN Zhiwei2, ZHANG Zhengxiang3, ZHANG Zilei3 2021, 40(06): 28-35.  DOI: 10.3969/j.issn.1674-0696.2021.06.05 Abstract ( )   PDF (3097KB) ( )   Aiming at the identification and control of key nodes of urban road network, the traditional method lacked the consideration of the influence of multiple factors such as structure and flow and introduced too many weighted parameters, which was too subjective. Therefore, two new concepts such as the node spatial-flow degree and the network structural flow entropy were introduced to establish a directed weighted road network model. And the identification method of urban key nodes based on the spatial-flow degree was proposed. Taking the road network of the Fourth Ring Road in Beijing as an example, the road network degree distribution and speed distribution were calculated, and the effectiveness of different methods was compared. The research results show that the proposed method can simultaneously identify nodes with large traffic flow and important structure. Moreover, increasing α and decreasing β is beneficial for improving the network connectivity performance, however, it is not conducive to the balanced distribution of traffic. The proposed method and results can shed light on the urban traffic planning, design and management, which is of great significance to alleviate congestion and improve robustness. References | Related Articles | Metrics

Select

Analysis of Influencing Factors of Taxi Accidents Based on Structural Equation Model WANG Yonggang, ZHANG Heng, PENG Zhipeng, ZHOU Wanqi 2021, 40(06): 36-42.  DOI: 10.3969/j.issn.1674-0696.2021.06.06 Abstract ( )   PDF (1215KB) ( )   Aiming at the impact of taxi drivers’ working conditions and aberrant driving behaviors on the accidents, a survey was conducted on 2 091 taxi drivers from 21 taxi companies in 4 cities such as Xi’an, Xining, Changchun and Shantou. On the basis of exploratory factor analysis, a structural equation model (SEM) between three variables and the crash propensity was established, and the three variables included job satisfaction, reckless driving and illegal driving. The research results show that SEM model can effectively analyze and explain the relationship between taxi accident propensity and its related influencing factors, among which reckless driving and illegal driving are significantly positively correlated with taxi accident propensity, while job satisfaction is significantly negatively correlated with taxi accident propensity. References | Related Articles | Metrics

Select

Seismic Reliability of Road Network and Route Selection of Post-Earthquake Transportation ZHANG Chongyang, HUANG Shuping 2021, 40(06): 43-51.  DOI: 10.3969/j.issn.1674-0696.2021.06.07 Abstract ( )   PDF (1777KB) ( )   The road traffic network will have a certain degree of structural damage and functional failure under the earthquake, which has an impact on the selection of transportation scheduling path after the earthquake. In order to study the seismic reliability of road network and the selection of transportation scheduling path after the earthquake, the connection probability of the road network was taken as the index to measure the seismic reliability of the road network, the Bayesian network was applied to the morphological characteristics of road network, and the Bayesian network model to quantify the seismic reliability of road network was constructed and solved. Taking post-earthquake transportation scheduling path selection as a multi-attribute decision making problem, a decision utility function model of transportation scheduling path selection was constructed by taking three attributes into consideration, such as transportation time, transportation distance and path reliability. By solving the proposed model, the post-earthquake transportation scheduling path selection scheme was determined. Taking part of the road network in Sucheng district of Suqian as an example, the seismic reliability of the road network was quantitatively analyzed under the influence of the earthquake, and the post-earthquake transportation scheduling path was selected. References | Related Articles | Metrics

Select

Setting No Re-inspection Control Point for Tourist Vehicles in Characteristic Towns ZHU Shunyin, LI Weiji, LIN Xiaoyuan, XIAO Wenbin, WANG Hong 2021, 40(06): 52-58.  DOI: 10.3969/j.issn.1674-0696.2021.06.08 Abstract ( )   PDF (6594KB) ( )   To solve the problems of complex management of personnel and vehicles, easy missing and congestion of vehicle detection in road network in the scenic area of open characteristic town, the management mechanism of pedestrian and vehicle in the mixed characteristic town with residence and tourism was researched. Based on Stoer-Wagner cut set algorithm, the algorithm of setting vehicle detection control points was proposed. By finding the minimum cut set of undirected graph with the reciprocal of capacity as the edge weight, the proposed algorithm could detect all vehicles entering the charging scenic area with the minimum number of points and the maximum capacity. The setting of vehicle layout point of Caotang scenic area in Wengan County, Guizhou was calculated and simulated by using Visual C++ and TransCAD software. The research results show that the management mechanism of pedestrian vehicle classification and the layout algorithm of vehicle control points have good effect, which reduces 20% of vehicle detection points. The layout of vehicle detection affects only 1% of transit traffic, and there is no repeated detection of recreational vehicles, which improves the smoothness of the tour. The pedestrian-vehicle management mechanism and the layout algorithm of vehicle control points have guiding significance for scenic spot planning, which are helpful to research the location of urban congested toll roads and research the tracking algorithm of ticket evasion vehicles when canceling provincial toll stations in the future. References | Related Articles | Metrics

Select

Development Evaluation Model of Smart Port Based on Improved Matter-Element Theory CAO Jie1, WANG Dacheng2, DAI Ran1, LI Hong2, HUANG Fucheng1 2021, 40(06): 59-65.  DOI: 10.3969/j.issn.1674-0696.2021.06.09 Abstract ( )   PDF (3427KB) ( )   The current smart port construction is in full swing, however, the industry standard system for smart port construction has not yet been unified. Firstly, the research foundation of the development path of smart port construction was used and the research results of domestic and foreign informatization development evaluation index systems were combined to construct an evaluation index system suitable for domestic smart port construction and development. Secondly, the subjective and objective comprehensive weighting method was used to reduce the influence of subjective factors on the index weights in the traditional evaluation process. The improved matter-element theory based on the cloud model was introduced to solve the errors caused by the ambiguity and randomness in the traditional evaluation methods. Finally, taking Tianjin Port smart port construction project as an example, the development level of Tianjin Port’s smart port was evaluated, the expected development level was 3.9956 and the development level was relatively good, which was consistent with the verification results of normal cloud model and grey correlation analysis method. The research results show that the proposed evaluation system is in line with the current development direction of smart ports and the evaluation method is simple and effective. It reduces the impact of double uncertainty on the evaluation results and calculates the confidence of the evaluation results at the same time, which provides reference for the future development and establishment of the evaluation system of smart ports. References | Related Articles | Metrics

Select

Optimization Model of Yard Crane Scheduling in a Container Terminal GUO Wenwen1, JI Mingjun2, ZHU Huiling3, ZHOU Wenjie2 2021, 40(06): 66-72.  DOI: 10.3969/j.issn.1674-0696.2021.06.10 Abstract ( )   PDF (1278KB) ( )   To improve the operation efficiency of wharf yard, the multi-yard-crane scheduling optimization problem was focused in the process of export container operation. Considering the quay cranes operation sub-plan and stacking status of yard bays, the number of containers extracted from the bay position of the yard in each subtask and the driving path of the yard crane were taken as the decision variables, a two-stage mathematical model was established to minimize the number of bays in yard crane operation and obtain the shortest travel path. From the point of view of single yard crane operation and double yard crane operation, an example was designed and CPLEX was used to solve the model, which verified the accuracy of model. Compared with sequential operation method, greedy operation method and genetic algorithm, the results show that the proposed two-stage model can effectively reduce the yard crane routing distance. References | Related Articles | Metrics

Transportation Infrastructure Engineering

Select

Research Progress of Flow and Sediment Movement in Curved Channel YAO Shiming1, ZHAO Zhanchao2, QU Geng1, ZHUANG Lingguang3 2021, 40(06): 73-79.  DOI: 10.3969/j.issn.1674-0696.2021.06.11 Abstract ( )   PDF (613KB) ( )   Flow and sediment movement in curved channel has always been one of the topics that river researchers pay close attention to, which is related to the river evolution and management. The research progress of flow and sediment movement in single bend and continuous bend at home and abroad was mainly summarized. The water surface gradient, vertical and horizontal velocity distribution, the movement characteristics of suspended sediment and bed load sediment in the curved channel were analyzed. It was considered that most of the previous studies were based on the results obtained under the condition of relatively balanced water and sediment conditions and relatively small-scale natural rivers. However, in view of the great changes in the flow and sediment processes, especially the bend channels in large-scale rivers where the incoming sediment was greatly reduced, there were few studies on the laws of flow and sediment movement, which limited the in-depth understanding of the evolution law of the large-scale bend river under the condition of sediment reduction. Therefore, it is necessary to carry out the research on the characteristics of flow and sediment movement in curved channels under changing environment on the basis of previous studies, so as to provide a basis for further study on the evolution law and governance of the curved channel. References | Related Articles | Metrics

Select

Spatial Effect Analysis of Single Box Three Chambers Continuous Girder Bridge under Transverse Temperature Gradient and Eccentric Vehicle Load LIU Jinchun, SONG Zixuan, LIANG Dong 2021, 40(06): 80-86.  DOI: 10.3969/j.issn.1674-0696.2021.06.12 Abstract ( )   PDF (7158KB) ( )   The spatial mechanical effect of continuous girder bridge with wide box structure is obvious. Based on the actual project of single box three chambers continuous girder bridge with a top slab width of 25.4m, the spatial effect of single box three chambers continuous girder bridge under transverse temperature gradient and eccentric vehicle load was investigated. Based on the data fitting of the field measured temperature, the transverse temperature gradient was obtained. Midas/FEA finite element software was used to establish the solid finite element model of the whole bridge. The effect of the transverse temperature gradient and the eccentric vehicle load were analyzed, and the load effects of the two were combined. The results show that the measured characteristic value of the transverse temperature gradient obtained by fitting is much higher than the reference value of the current specification. When the effect of transverse temperature gradient is combined with the effect of eccentric vehicle load, the longitudinal stress and the transverse stress at the bottom slab of middle-span of the central span of single box three chambers continuous girder bridge no longer meet the crack resistance requirements of class A partially prestressed concrete structures under the short-term effect combination in the specification. References | Related Articles | Metrics

Select

Preparation and Performance of Compound Waste Engine Oil Rejuvenator GUO Peng1, CHEN Sixian1, CAO Zhiguo1, LIU Jun1, MENG Jianwei2, XIAN Jianglin3 2021, 40(06): 87-91.  DOI: 10.3969/j.issn.1674-0696.2021.06.13 Abstract ( )   PDF (3479KB) ( )   The waste engine oil was used as the base oil, and antiaging agents, surfactants, and stabilizers were added to improve the regeneration effect of the aged asphalt and promote the fusion of new and old asphalt. Rotary film oven, asphalt rotational viscometer, differential scanning calorimeter (DSC), dynamic shear rheometer and other instruments were used to measure the relevant performance of the recycled asphalt, and the optimal content of the three additives and the dosage of rejuvenator were analyzed by DesignExpert. Finally, through the water stability and low temperature crack resistance of recycled asphalt mixture, the performance of rejuvenator was further analyzed. The test results shows that the compounded rejuvenator can effectively promote the aging of new and old asphalt and inhibit the secondary aging of recycled asphalt, and the regeneration effect is good. References | Related Articles | Metrics

Select

Properties of Waste Vegetable Oil Recycled Asphalt Binder XIAO Qingyi1,2, ZHAO Peng1, SUN Bowei3, ZHANG Yi4, DING Xiao5 2021, 40(06): 92-98.  DOI: 10.3969/j.issn.1674-0696.2021.06.14 Abstract ( )   PDF (9127KB) ( )   In order to solve the problems of unstable and high price of traditional mineral oil asphalt regenerant, the waste vegetable oil (WVO) after frying was used to regenerate the aged asphalt. The effects of different amounts of WVO on physical properties, high temperature rheological properties, low temperature bending rheological properties and microstructure characteristics of the aged asphalt were studied. The results show that with the increase of the amount of WVO, the ductility and penetration of the aged asphalt gradually increase, while the softening point and brookfield viscosity gradually decrease; the phase angle (δ) gradually increases, the complex shear modulus (G*) and the rutting factor (G*/sinδ) decreases gradually, and the rutting resistance of the asphalt binder decreases. At the same time, the creep stiffness modulus (S) of the aged asphalt decreases, the creep rate (m) increases, which means the low temperature cracking resistance of asphalt binder increases. In order to ensure that the recycled asphalt has good high and low temperature performance, it is recommended that the amount of WVO is controlled within the range of 7% to 10%.Aging and regeneration of WVO leads to the evolution of the microstructure characteristics of asphalt. The regeneration of WVO restores the “bee-shaped” structures in aged asphalt, and the surface height and surface roughness of asphalt increase. There is a quantifiable correlation between the evolution of microstructure characteristics and macro rheological properties of asphalt caused by aging and regeneration. References | Related Articles | Metrics

Select

Particle Size and Distribution Influencing Factors of Anionic Emulsified Asphalt HE Lihong1,2, WEN Xianxian1,2, HOU Yitong 1,2, DENG Wen 1,2 2021, 40(06): 99-104.  DOI: 10.3969/j.issn.1674-0696.2021.06.15 Abstract ( )   PDF (4911KB) ( )   The particle size and distribution of anionic emulsified asphalt with 60% solid content were investigated by laser particle size analyzer and optical microscope. The influence law of dosage and proportion of compound emulsifier, pH value of soap solution, shear time and storage time on particle size and distribution was investigated, and then the mechanism of improving the stability of emulsified asphalt was analyzed and summarized. The results show that when the mass ratio of SDS/OP-10 (sodium dodecyl sulfate/ alkylphenol ethoxylates) is 1∶1, the average particle size of anionic emulsified asphalt is 1.849 μm, which is evenly distributed in the range of 0.7μm to 3μm. The average particle size decreases with the increase of pH value of soap solution and shearing time, but increases slightly with the prolongation of storage time. References | Related Articles | Metrics

Select

Numerical Analysis of the Uplift of Cement Stabilized Macadam Base Asphalt Pavement YAO Ailing1, WANG Junwei2, XU Min3, YANG Mengqian4, YANG Tao1 2021, 40(06): 105-111.  DOI: 10.3969/j.issn.1674-0696.2021.06.16 Abstract ( )   PDF (3403KB) ( )   In the desert Gobi area of Alxa League in Inner Mongolia, the transverse uplift with certain interval has always been appeared in the cement stabilized macadam base asphalt pavement, which is usually prevented by setting transverse expansion joints of asphalt stabilized macadam. On the basis of field investigation of this disease, the temperature distribution of pavement structure layer was monitored and the causes of the disease were analyzed. Moreover, through theoretical analysis and numerical calculation, the setting interval of expansion joint was recommended. Analysis shows that the uplift of asphalt pavement has a relation to the arch swell of cement stabilized base at high temperature. According to the pavement design data of Alxa League of G7 Beijing-Xinjiang Expressway and the measured temperature distribution law of pavement structure layer, the ANSYS finite element model was established, and the influence of temperature and expansion joints spacing of base on the uplift of pavement was analyzed under the temperature filed. The numerical analysis shows that both the temperature and expansion joints spacing of base have a serious impact on the uplift of pavement. If a swell joint could be set at base every 200m apart, the uplift of the asphalt pavement in this area can be effectively avoided. References | Related Articles | Metrics

Select

Design and Analysis of Half-Open Arch Portal in Shallow Buried Bias Tunnel SU Xingju 2021, 40(06): 112-116.  DOI: 10.3969/j.issn.1674-0696.2021.06.17 Abstract ( )   PDF (6639KB) ( )   Under the complex unsymmetrical pressure geological conditions, the commonly used skew entering in tunnel portal area may cause large deformation and even overturning of the secondary lining. Based on Longmen Tunnel of Xiamen-Chengdu highway, the half-open arch portal construction scheme was put forward due to severe unsymmetrical loading conditions and over 30° skew angle disadvantageous situation. The three-dimensional finite element model was established and the construction mechanics response of the half-open arch structure was analyzed. The analysis results indicate that: compared with the traditional tunnel-entering scheme, the proposed method can effectively reduce the excavation height of the side slope and the disturbance to the surrounding rock; besides, the deformation and stress of half-open arch structure are also relatively reasonable. The proposed method has been successfully applied in Longmen Tunnel, which can provide reference for similar tunnel construction. References | Related Articles | Metrics

Select

Positioning Accuracy Analysis of Aerial Triangulation of UAV Images without Ground Control Points XIAO Suyong 2021, 40(06): 117-123.  DOI: 10.3969/j.issn.1674-0696.2021.06.18 Abstract ( )   PDF (7403KB) ( )   With the rapid development of UAV technique and improvement of image matching algorithm, UAV technology is widely used in smart city, surveying and mapping production, BIM system and other fields. The network RTK technology and PPK technology have made it possible to obtain high-precision position information for UAV images, which has provided the possibility for aerial triangulation of UAV images without ground control points. Firstly, the theoretical knowledge of aerial triangulation without ground control points was introduced. Then, the main factors (including overlap rate, oblique angle, camera model, the accuracy and weighting of exterior orientation elements and the accuracy and weighting of exterior azimuth elements) affecting the positioning accuracy of aerial triangulation were analyzed by using simulated and measured data. Finally, the project implementation suggestions of aerial triangulation without ground control points were given. The research results show that the aerial triangulation of UAV images without ground control points is possible, whose implementation depends on proper flight parameters setting, high accuracy exterior orientation elements, the optimal aerial triangulation post-processing solution and the elevation anomaly correction. References | Related Articles | Metrics

Transportation Equipment

Select

Influence of Suspension Parameters on Air Gap Stability and Running Stability of Linear Motor Straddle Monorail Vehicle DU Zixue, WU Haoxin 2021, 40(06): 124-129.  DOI: 10.3969/j.issn.1674-0696.2021.06.19 Abstract ( )   PDF (5193KB) ( )   When the straddle-type monorail vehicle driven by the rubber wheel runs in ice and snow days, the running wheel is easy to slip, which affects the safe driving of the vehicle. In order to solve the above problem, a straddle-type monorail vehicle scheme driven by linear motor was designed, a dynamics model of straddle-type monorail vehicle driven by linear motor was established and the air gap stability and running stability of the vehicle with different suspension parameters were analyzed. The results show that the stiffness of the support wheel and the rubber spring have a great effect on the air gap of the motor, but the stiffness of the support wheel and the rubber spring have little effect on the running stability of the vehicle. References | Related Articles | Metrics

Select

Interpolation Coupling Wireless Charging Technology for Electric Vehicles DENG Mingyang1,2，GUO Yingshi1 2021, 40(06): 130-135.  DOI: 10.3969/j.issn.1674-0696.2021.06.20 Abstract ( )   PDF (2100KB) ( )   In order to solve the problem that the fixed-point setting of electric vehicle charging piles limited the battery endurance, a wireless charging method for electric vehicles based on interpolation coupling technology was proposed. Firstly, the interpolation coupling technology was used to drive the motor to precisely control the coil positioning, so that the charging coil was charged within the effective charging distance. Furthermore, the charging module adjusted the charging current according to the current feedback signal, and charged quickly according to the floating charge, constant current and second-order constant voltage processes. Next, the theoretical values of the matching charging radius R and charging distance D were calculated according to Biot-Savarts law. Finally, MATLAB software simulation experiments were conducted to verify the optimal values of the theoretical R and D. The results show that the positioning control based on the interpolation coupling technique can ensure that the charging coil transmits the maximum power, which not only solves the constraint of fixed-point charging, but also improves the wireless charging efficiency; the multi-stage fast charging process eliminates the effect of current variation and continuous charging on battery life. In addition, the magnetic flux through the charging coil is maximized at R=40 cm and D=10 cm, which is the optimal design. References | Related Articles | Metrics

Select

Heat Dissipation of Liquid Cooling Switched Reluctance Motor with Improved Parallel Flow Channel AN Zhiguo, DOU Wang, LI Yakun, WANG Shanming 2021, 40(06): 136-142.  DOI: 10.3969/j.issn.1674-0696.2021.06.21 Abstract ( )   PDF (4727KB) ( )   Taking the cooling channel of switched reluctance motor as the research object, an improved parallel channel was proposed on the basis of the traditional parallel flow channel, which had the advantages of low requirement for cooling system, good cooling effect and simple manufacturing process. The 3D numerical simulation model of the motor was established and a comparative investigation on the cooling performance was carried out, between traditional and improved parallel channels with variations of fluid flow rate, ambient temperature, and initial temperature of fluid under condition of the transformer oil as medium. Then, the influence of fluid medium on the temperature rise of the improved parallel channel motor was further analyzed. The researches show that: under different fluid flow rates, the heat dissipation performance of the improved parallel channel is better than that of the traditional parallel channel, and it is not easy to be affected by the environment, so it has better thermal stability; when the flow rate is 2L/min, the maximum temperature difference between the two flow channels is 5.9℃. By comparing the influence of different cooling media on the heat dissipation performance of the improved parallel channel of switched reluctance motor, the following conclusions are drawn: compared with transformer oil and ethylene glycol mixture solution, the liquid water cooling effect is the best, and among the three media, the transformer oil channel pressure difference is the smallest. The fluid flow rate has the greatest influence on the cooling effect of transformer oil and the least influence on the pressure difference of channel. When the volume concentration of ethylene glycol increases, the cooling effect of the mixed solution of ethylene glycol becomes worse and the channel pressure difference increases. References | Related Articles | Metrics