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21 December 2019, Volume 38 Issue 12 Previous Issue    Next Issue
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Transport+Big Data and Artificial Intelligence
Bridge & Tunnel Engineering
Highway & Railway Engineering
Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment
Traffic & Transportation Engineering
Vehicle &Electromechanical Engineering


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Transport+Big Data and Artificial Intelligence

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Collision Avoidance Path Planning of Ships in Complicated Water Areas XIE Xinlian, HE Ping, HE Ao, XIN Jianying 2019, 38(12): 1-7.  DOI: 10.3969/j.issn.16740696.2019.12.01 Abstract ( )   PDF (772KB) ( )   For the problem of collision avoidance of ships in complicated water areas where both target ships and navigationobstructing areas exist at the same time, on the premise of considering the international regulations for preventing collisions at sea(COLREGS), the environment of complex waters was modeled by combining the predicted danger zone (PAD) theory of collision avoidance for targets ships, the buffer zone analysis referred to related achievements in the field of ship domain and the tangent graph method. And Dijkstra algorithm was used to find an initial path to avoid all the obstacle areas. Then, based on the improved 2turn method, the initial path was smoothed by using the ships turning diameter, and the collision avoidance turning angle and return angle were given, which could not only smooth the path but also test the effectiveness of the original path. Finally, the simulation experiment was carried out, and the correctness and applicability of the proposed method was verified. The path planning methods of Maklink graph, Dijkstra and ant colony algorithm were compared and analyzed. The results show that the proposed method has more advantages in time performance, smoothness of the whole path and the degree of path optimization. References | Related Articles | Metrics

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Speed Guidance Strategies at Signalized Intersections in a Vehicle Infrastructure Cooperative Environment LIU Huan1, YANG Lei2, SHAO Shegang1, WANG Zhaoming1 2019, 38(12): 8-17.  DOI: 10.3969/j.issn.1674-0696.2019.12.02 Abstract ( )   PDF (712KB) ( )   When the vehicle passes through the intersection, it will be delayed due to traffic signal control. A speed guidance strategy at signalized intersections in a cooperative vehicle-infrastructure environment was proposed. Considering the guided vehicle and the ordinary vehicles behind it as a fleet, the purpose of the vehicle passing through the intersection without stops under the guidance of speed guiding strategy could be achieved by analyzing the speed and position of the vehicle and judging whether the vehicle under different driving states can pass. The proposed speed guidance strategy was analyzed and evaluated in the established simulation environment based on the microscopic traffic simulator VISSIM and MOVES emission model. The simulation results show that the proposed speed guidance strategy can significantly reduce delay and queue length, improve vehicle travel efficiency, and reduce vehicle pollution emissions. References | Related Articles | Metrics

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An Improved Social Force Model Considering Bicycle Conflicts at Intersection ZHU Jiasong, CHEN Siyuan 2019, 38(12): 18-25.  DOI: 10.3969/j.issn.1674-0696.2019.12.03 Abstract ( )   PDF (646KB) ( )   With the rapid increase of the number of “shared bicycles”, under the condition of insufficient bicycle driving space, riders occupy the right of way, forcing pedestrians to slow down, turn and do other evasive behaviors. In the traffic mixed intersection, the conflict between bicycles and pedestrians is particularly serious, which not only increases the traffic time of the intersection, but also reduces the pedestrian safety. In order to optimize the traffic organization of intersections, it is necessary to deeply analyze the complex behavior patterns of pedestrians in the environment of bicycle disturbance, and establish a micro pedestrian model to carry out simulation analysis. However, most of the existing studies are based on the complete bicycle driving environment in western cities and lack of consideration of the pedestrian-vehicle conflict caused by the lack of bicycle planning in China, resulting in inaccurate simulation results. Therefore, based on the social force theory, an improved pedestrian model was proposed, and a pedestrian-bicycle conflict simulation model was established. In addition, in order to overcome the limitation of traditional camera shooting angle, the UAV was used to collect and extract the complete pedestrian trajectory data, and the proposed model was calibrated with the maximum likelihood estimation method. Finally, the original social force model was introduced for comparison, and the accuracy of the proposed model was verified by the real trajectory data of pedestrians. The test results show that: the improved pedestrian model can more truly and reasonably describe the random behavior of pedestrians in the real world, which is of great significance to the study of pedestrian behavior in China and provides theoretical basis for the traffic planning, management and signal control scheme design of intersections. References | Related Articles | Metrics

Bridge & Tunnel Engineering

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Research Status and Development Trend on Vehicle-Bridge Coupling Vibration in China QIAO Peng, ZHONG Chengxing, WANG Zongyi, WANG Ayong 2019, 38(12): 26-37.  DOI: 10.3969/j.issn.1674-0696.2019.12.04 Abstract ( )   PDF (660KB) ( )   Since entering the 21st century, Chinas highway and railway transportation have been greatly developed in terms of higher speed and heavier load. As more and more bridges have light weight and long spans, and the dynamic problem of vehicle-bridge structure is more and more prominent. Therefore, attentions have been focused on the research of vehicle-bridge coupling vibration. Based on the review of the research on vehicle-bridge coupling in recent 20 years in China, the vehicle model, bridge model and numerical calculation method of vehicle-bridge coupling vibration were summarized. And the research contents of vehicle-bridge coupling vibration in four aspects of earthquake load, wind load, unevenness and resonance were introduced systematically. Finally, some issues of vehicle-bridge coupling were suggested to be further studied, which could provide some reference for the future research of vehicle-bridge coupling. References | Related Articles | Metrics

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Modification of Creep Model Based on Experiment and Bridge Linear Analysis Method MAO Jianghong1,2，LU Fei1，ZHANG Yi3，ZENG Jiahua4，YAN Jianbiao3 2019, 38(12): 38-44.  DOI: 10.3969/j.issn.1674-0696.2019.12.05 Abstract ( )   PDF (716KB) ( )   Aiming at the problem of inaccuracy of simulation results caused by direct selection of norm values in finite element software with consideration of creep, a method was proposed that concrete creep test under compression should be carried out first, and then the tested data should be applied to finite element software for simulation analysis. Based on the empirical creep prediction formulas established by J.J.Brooks and Neville, the long-term creep prediction model for C55 concrete was obtained by modifying the short-term test data. The research results show that: there are some differences between the creep development law of the existing creep prediction models and that measured by the experiment, which will have a significant impact on the simulation results of bridge alignment, and the impact will increase with time; when establishing a long-term creep prediction model, the prediction accuracy can be effectively improved by increasing the short-term test time appropriately. References | Related Articles | Metrics

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Experimental Study on Shearing Resistance of Fully Assembled Steel-Concrete Composite Structures ZENG Dezi1, YANG Weipeng2, GAO Yanmei2,3, LI Chengjun4 2019, 38(12): 45-50.  DOI: 10.3969/j.issn.1674-0696.2019.12.06 Abstract ( )   PDF (956KB) ( )   In order to explore the mechanical properties of PCSS, large-scale PCSS shear connection members were designed and tested. The test results show that large-scale PCSS shear connectors are stressed in three stages. ①In the elastic stage: 0＜P≤0.5Pu, the slope of load-slip curve of PCSS shear studs remains unchanged and the slip changes in a straight line, which indicates that the member is in the elastic phase of stress and the shear stiffness remains unchanged. ②In elastic-plastic stage: 0.5Pu＜P≤0.8Pu, the slope of the load-slip curve of the PCSS shear studs is continuously decreasing, which indicates that the member is in the elastoplastic stage of stress and the shear stiffness is reduced. ③In destruction stage: P＞0.8Pu, the curve changes smoothly, which indicates that the interface of the component has a large slip under the action of load, which accelerates the failure of the component until the bolt is cut off and the test stops. When the mechanical properties of large and small components are compared, the mechanical properties of the small components are better. However, in practical cases, the PCSS shear connectors are mostly in the form of large-scale components. The actual stress state of studs can be better simulated by considering the influence factors of the size effect and group nail effect of large members. According to the existing calculation method of shear studs, the calculation formula of the applicable ultimate bearing capacity of the PCSS shear studs is recommended. References | Related Articles | Metrics

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Elastic Local Shear Buckling Stregth of Trapezoidal Corrugated Steel Webs WANG Yinhui1,2, ZHENG Liang1 , GUAN Yanzeng 3, WANG Tao2 2019, 38(12): 51-56.  DOI: 10.3969/j.issn.1674-0696.2019.12.07 Abstract ( )   PDF (923KB) ( )   Although the elastic local shear buckling strength of trapezoidal corrugated steel webs has a definite formula, the formula is only applicable to the case where the width of the flat sub-panel is similar to that of the inclined sub-panel; its applicability is relatively poor when the difference between the two is large. Based on the theoretical analysis and numerical simulation, the elastic local buckling of trapezoidal corrugated steel webs of different sizes was studied, the limitation of the existing calculation formulae for calculating the elastic local buckling strength was analyzed, and the influence of the narrow-width ratio on the buckling strength of the sub-panels was revealed. By means of quantitative analysis, the current calculation formula was revised reasonably. The calculation formula of the elastic local buckling strength of the trapezoidal corrugated steel webs with wider application range was proposed, and the proposed formula was proved to be more accurate by the example of calculation. References | Related Articles | Metrics

Highway & Railway Engineering

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Dynamic Stress Response of Asphalt Pavement with Granular Base GAO Jianhong, XU Youjun, YANG Shengchun 2019, 38(12): 57-62.  DOI: 10.3969/j.issn.1674-0696.2019.12.08 Abstract ( )   PDF (548KB) ( )   Based on the emphasis on the granule base in the new asphalt pavement design specification, the structure model of the granule base asphalt pavement was established by using the finite element software ANSYS, and the dynamic transient analysis was carried out by two loading methods. It is concluded that: ①At the same depth and different positions on the vehicle driving track line, the shape and peak value of the stress time-history curve under the action of fluctuating load on the observation points are quite different, while the shape and peak value of the stress time-history curve under the action of uniform load are almost the same. However, the stress extremes obtained by the two loading methods are basically the same. ②Regardless of the loading mode, the deeper the road surface is downward, the smaller the stress peak value is, the stronger the diffusion effect is, and the slower the response of the observation point to the load is. ③The vertical stress decreases downward from the surface; the longitudinal horizontal stress is always greater in the longitudinal direction than in the transverse direction. These conclusions can provide reference for the stress conditions of granular base asphalt pavement under different dynamic loads. References | Related Articles | Metrics

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Influencing Factors of Compaction Characteristics of Warm Mix Asphalt Mixture NAN Qiucai 2019, 38(12): 63-68.  DOI: 10.3969/j.issn.1674-0696.2019.12.09 Abstract ( )   PDF (411KB) ( )   In order to master the influencing factors of compaction characteristics of warm mix asphalt mixture, the physical significance of compaction energy index CEI, traffic densification index TDI, slope K1 and K2 was analyzed based on the gyratory compaction densification curve. The influence of the content of warm mixing agent, aggregate angularity and gradation on the above four compaction parameters of asphalt mixture was researched. The results show that Sasobit warm mixing agent can improve the compressibility of asphalt mixture in construction and the anti-deformation ability of asphalt mixture after open traffic, and the improvement effect is gradually enhanced with the increase of the content of warm mixing agent. When the aggregate angularity becomes better, the compressibility of the prepared asphalt mixture becomes worse, but the anti-deformation ability after open traffic becomes better. When the nominal maximum particle size of gradation increases or the gradation becomes coarse in asphalt mixture, its compressibility becomes worse, but the anti-deformation ability of asphalt mixture after open traffic is not significantly related to the nominal maximum particle size of gradation and the gradation thickness. References | Related Articles | Metrics

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Evaluation Indexes for Anti-sliding Performance and Evaluation Method of Anti-sliding Life of Asphalt Pavement LI Jingruo1,2, WU Zhuoke3, CHEN Xiaoli3, SUN Hongxian4, TAN Wei2, LI Na4 2019, 38(12): 69-75.  DOI: 10.3969/j.issn.1674-0696.2019.12.10 Abstract ( )   PDF (617KB) ( )   Aiming at the deficiency of indoor evaluation index and method of anti-sliding performance of asphalt mixture, a tester for testing the friction characteristics of aggregate or asphalt mixture was developed, and its testing principle, instrument parameters and functional purposes were also defined. Secondly, based on the fitting analysis between the asphalt pavement field anti-sliding performance test data and the indoor anti-sliding performance test data, the evaluation method on the anti-sliding life for asphalt pavement was proposed. Moreover, the testing method and evaluation indexes of dynamic friction coefficients of pavement materials were put forward, including attenuation terminal value, attenuation rate, dynamic friction coefficient threshold of asphalt mixture and anti-sliding life. Lastly, the digital quantitative method was used to reveal the influence law of aggregate characteristics, blending scheme, gradation type and thickness on the anti-sliding performance of asphalt pavement, and to clarify the anti-sliding performance improvement scheme. References | Related Articles | Metrics

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Resilient Modulus of Lime Modified Subgrade Soil under Freezing-Thawing Cycle SONG Jinhua, LIN Yuanhao 2019, 38(12): 76-80.  DOI: 10.3969/j.issn.1674-0696.2019.12.11 Abstract ( )   PDF (395KB) ( )   After experiencing many repeated freeze-thaw cycles, the mechanical properties of the subgrade soil decrease rapidly, resulting in a continuous decline of the road performance of the subgrade. Based on the indoor freezing-thawing cycle experiment, a series of dynamic resilient modulus experiments were carried out on the lime-modified marine sedimentary soil by using the dynamic tri-axial repeated loading method. The influence rule of the freezing-thawing times, water content, ash mixing ratio and compaction degree on the dynamic resilience modulus of lime-modified soil subgrade were studied. The results show that with the increase of the number of freezing-thawing cycles, the dynamic resilience modulus of lime-modified subgrade decreases continuously, and the influence of freezing-thawing cycles on its dynamic resilience modulus is significant. When the stress condition is the same, the higher the equilibrium moisture content of lime-modified subgrade soil is, the more sensitive the dynamic resilient modulus is to the freezing-thawing cycle, and the dynamic resilient modulus tends to be unstable. References | Related Articles | Metrics

Port & Waterway · Hydraulic & Hydroelectric · Resources & Environment

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Experiment Study of Small Radius Turn-around Curved Channel Regulation Based on Small-Scale Ship Model Technique CAI Chuang1, CAI Xinyong2 2019, 38(12): 81-85.  DOI: 10.3969/j.issn.1674-0696.2019.12.12 Abstract ( )   PDF (695KB) ( )   The complex flow condition of turn-around curved channel poses a great threat to the navigation safety of ships. The small-scale ship model was adopted to study navigation of hub. According to the size parameters and maneuverability indexes of the real ship, a small-scale model of a real ship was manufactured, and the experiments were carried out to simulate the motion of the real ship. Four kinds of ship navigation schemes, i.e. channel radius r=360, 440, 480 m of small radius turn-around curved channel and optional route, were selected to study the parameters of ship model navigation, such as the maximum rudder angle Rmax, maximum drift angle Dmax and speed V under the four representative flow conditions of Q=1,160 m3/s, 4,000 m3/s, 6,000 m3/s and 7,550 m3/s. And the design scheme of turn-around curved channel regulation was evaluated comprehensively. The results show that the ship navigation scheme of the optional route is better than the other three schemes; the difficulty of sailing up and down increases with the increase of four representative flows Q. The difficulty of the ship navigation is pointed out, and the optimal route and safe driving mode are put forward. The research conclusion can be used as the basis for the regulation of small radius turn-around curved channel. References | Related Articles | Metrics

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Determination of Width of Regulation Line in Pebble Shoal Based on Extreme Speed Method XU Guangxiang1, JIANG Ziwei1, 2 2019, 38(12): 86-91.  DOI: 10.3969/j.issn.1674-0696.2019.12.13 Abstract ( )   PDF (649KB) ( )   The conventional methods to determine the width of the regulation line in pebble shoal, such as hydraulic geometry relation method, hydraulic method, river dynamics method and empirical method, can not fully reflect the basic characteristics of the shoal. Based on the characteristics of the section shape of the shoal, the layout position of the channel and the velocity distribution, a method called extreme speed method for calculating the width of regulation line was put forward. By introducing the parameters such as dredged channel water depth coefficient (ηH), dredged channel velocity coefficient (ηV) and hydraulic index of ascending rapids (EC), the calculation formula of the width of regulation line reflecting the characteristics of rapids was derived. Using plane two-dimensional flow mathematical model, the width of regulation line B2 of the Liziqi pebble shoal in Baisha waterway reach of the upper reaches of the Yangtze River was checked by extreme speed method. The results show that the width range of regulation line B2 calculated by extreme speed method is 436~440 m, which is consistent with the practical engineering (the width range of regulation line B2 of Yibin-Chongqing reach in the upper reaches of the Yangtze River is 400~500 m ). The calculation formula of extreme speed method is indicated to be reasonable and feasible, which can be applied to the design and scheme optimization of similar shoal regulation projects. References | Related Articles | Metrics

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Degradation Characteristics and Deformation Failure Mode of Perilous Rock Mass in the Three Gorges Reservoir Area WANG Heng1，JIANG Xiannian1, LI Shujian2, JIA Zhidan1 2019, 38(12): 92-96.  DOI: 10.3969/j.issn.1674-0696.2019.12.14 Abstract ( )   PDF (2302KB) ( )   Based on the project background of Huangyanwo Perilous Rock mass in the Three Gorges Reservoir Area, the deterioration characteristics of the rock mass in the west section of Huangyanwo were analyzed by means of surveying and mapping, single-hole acoustic wave method, in-hole high-definition video recording and geophysical prospecting test, and the deformation and failure mode of the perilous rock mass was discussed. The results show that the rock mass in the Huangyanwo Perilous Rock falling zone extending 18m inward along the riverside cliff has a high degree of deterioration, and the three basic deformation failure modes of the perilous rock mass are buckling sliding, toppling and falling. Under the influence of self-weight, corrosion and river water fluctuation and erosion, it is easy to induce sliding, toppling or falling composite deformation failure of the upper rock mass. References | Related Articles | Metrics

Traffic & Transportation Engineering

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A Combined Transportation Model Based on Unconstrained Optimization Method HU Wenjun1, ZHOU Xizhao2 2019, 38(12): 97-104.  DOI: 10.3969/j.issn.1674-0696.2019.12.15 Abstract ( )   PDF (454KB) ( )   A general unconstrained optimization model of combined travel-destination-mode-route choice was established based on expected utility theory. The choice of travel or not, the choice of travel destination, the choice of mode and the distribution of traffic were analyzed in a unified framework. The travel impedance of the combined model, the probability or conditional probability of users choosing travel, destination, mode and path respectively, and the characteristics of satisfaction function were derived. The equivalence, existence and uniqueness conditions of solutions of unconstrained optimization models were analyzed and derived. Then the general form of the model formula was extended to the combined unconstrained optimization model of path selection subject to polynomial Logit and C-Logit. A simple example was used to demonstrate the feasibility and effectiveness of the proposed model. The results show that the solution of unconstrained optimization combination model is equivalent to that of constrained combination model. At the same time, the overlapping effect of path affects the equilibrium travel flow, destination flow, mode flow and path flow through the overlap length of the path and the attraction of the OD pairs. Compared with general models, the proposed model has better explanatory and predictive power. References | Related Articles | Metrics

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Dynamic Prediction Model of Bus Dwell Time under Different Station Conditions DENG Mei1，LI Chunda2 2019, 38(12): 105-109.  DOI: 10.3969/j.issn.1674-0696.2019.12.16 Abstract ( )   PDF (388KB) ( )   The bus dwell time refers to the time spent waiting for the passengers to get on and off the bus at the platform, which is the main reference factor for the operation scheme of the bus system and the setting of bus stops. Bus dwell time presents different trends in different periods of time in densely populated areas such as central urban area and central business district. A generalized bus dwell-time model was established, based on the waiting time outside the bus stop, the time when the bus accelerates to enter the bus stop, the actual stop time of the bus at the bus stop, the total number of passengers getting on the bus, the total number of passengers getting off the bus and other factors. The change trend of the bus dwell time in different traffic hours in the downtown area was studied. Finally, the quantitative analysis of the bus dwell time distribution in different station environments of Nanning public transportation system was carried out. The research shows that the bus dwell time at morning peak is obviously larger than that at the noon peak and evening peak, which can help decision-makers of public transportation system to make reasonable development strategies and improve the overall service level of public transportation system. References | Related Articles | Metrics

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Comparative Evaluation of Urban Public Traffic Benefits Based on DEA Model PENG Hui, ZHAO Yajun 2019, 38(12): 110-114.  DOI: 10.3969/j.issn.1674-0696.2019.12.17 Abstract ( )   PDF (402KB) ( )   Aiming at the problems of different cities with different benefits of conventional public transport and low benefits of some cities, the DEA model with 10 indexes as influencing factors was established on the basis of the statistical data of public transport in each city, considering the influence objects such as travelers, government departments and public transport companies. The 10 indexes included the daily average passenger traffic volume of conventional public transport on the ground, the ownership rate of public transport for ten thousand people, the density of public transport network, the coverage rate of stations, the share rate of public transport for residents, and the public transport lines, waiting time per capita, average transfer times, non-linear coefficient, and daily average exhaust emissions. The public transport operation conditions of 8 cities in China were evaluated and relevant conclusions were obtained. The research shows that the data envelopment analysis method (DEA) is suitable for super-efficiency analysis of conventional bus traffic benefits in different cities. The analysis shows that the efficiency value of Xi’an is the largest and Shantou is the smallest; in addition, the public transport efficiency values of Xining, Taiyuan and Jilin are roughly the same. The research results are helpful to find out the reasons for the low efficiency of urban public transport and provide theoretical basis for improving the service level of urban public transport operation. References | Related Articles | Metrics

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Evaluation of Operation Efficiency of China’s Airport Industry Based on Super-efficiency DEA-Malmquist Model CHU Yanchang, CHEN Feichao 2019, 38(12): 115-122.  DOI: 10.3969/j.issn.1674-0696.2019.12.18 Abstract ( )   PDF (578KB) ( )   Based on the analysis of the overall status quo of Chinas airport industry from 2008 to 2017, the super-efficiency DEA (CCR)-Malmquist model was established to evaluate the operation efficiency of airport industry in seven regions (North China, northeast, East China, Central South, southwest, northwest, Xinjiang) in the past 10 years. The research indicates that: the airport business volume in Northwest China has grown rapidly, while that in North and East China has grown slowest in the past 10 years. This is mainly due to the introduction of advanced technology in Northwest China. Whether from the perspective of time series data or cross-section data, the development of the airport industry in China mainly depends on the scale efficiency, and the technology is still relatively backward. References | Related Articles | Metrics

Vehicle &Electromechanical Engineering

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Electronic Differential Control of Multi-axle Wheel-Hub Motor Driven Electrical Vehicles JIN Liqiang, TIAN Duanyang, SONG Qi 2019, 38(12): 123-132.  DOI: 10.3969/j.issn.1674-0696.2019.12.19 Abstract ( )   PDF (683KB) ( )   Aiming at the problem that the electronic differential control of electric wheel driven vehicle cant adapt to any driving conditions and the higher requirements of motor performance at this stage, a self-adaptive electronic differential control was carried out. The wheel-hub motor was controlled by torque command and speed follow-up, so that the wheel could realize differential speed according to its stress state. At the same time, the modeling method of multi-axis wheel-hub motor driven vehicle dynamics was introduced. On the basis, the overall control strategy was introduced to simulate the power distribution characteristics of the traditional vehicle from the power system to the differential. The difference between the drivers expected speed and the feedback actual speed was input into the PID controller to output the target torque of each motor. Finally, the differential evaluation method was proposed, and the off-line simulation and HIL test were carried out for the three main conditions of differential problems. The results show the proposed self-adaptive electronic differential control can control the theoretical and actual driving distance error of the wheel less than 0.5%, which verifies the correctness of the electronic differential control strategy and the high control accuracy. References | Related Articles | Metrics

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LQR Four-Wheel Steering Control Based on State Observer LI Wei, WANG Weiwei, XU Haofei 2019, 38(12): 133-139.  DOI: 10.3969/j.issn.1674-0696.2019.12.20 Abstract ( )   PDF (682KB) ( )   Two-degree-of-freedom model of four-wheel steering system was established based on the risk of the same direction of mass center sideslip angle and yaw rate and the contradiction of reverse control strategy in the high-speed driving process of the four-wheel steering system. A reduced order state observer was designed to solve the problem that the sideslip angle of vehicle centroid was difficult to be measured by existing sensors. Then, the pole assignment method and LQR (linear quadratic optimal control) method were used to design the controller respectively, and a control law design method which weighted the state regulator and the target yaw rate tracking was proposed. MATLAB/Simulink was used to simulate the step mode and the single line transfer mode. The results show that the steady-state yaw rate decreases slightly, but it can significantly improve the track ability of the vehicle. References | Related Articles | Metrics

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Optimization of Steering Torque for APM Vehicle TANG Fei1, LI Yao2, ZHU Fucheng3 2019, 38(12): 140-144.  DOI: 10.3969/j.issn.1674-0696.2019.12.21 Abstract ( )   PDF (862KB) ( )   From the perspective of vehicle design and optimization of system dynamics parameters, a method for optimizing the guidance performance of APM vehicles was explored and analyzed. Firstly, the structure of the APM vehicle was analyzed. On this basis, the APM vehicle dynamic simulation models were established. Then, the sensitivity analysis of the system dynamics parameters of the APM vehicle was performed, and the parameters that had significant influence on the steering torque of the APM vehicle were selected. Finally, the ADAMS and modeFRONTIER were combined to optimize the steering torque of the APM vehicle. The optimization results show that under the given constraints, when the vertical stiffness of the air spring, the stiffness of vertical oil damper, the vertical stiffness of the running wheel, the side-bias stiffness of the running wheel, and the radial stiffness of the guide wheel reach the optimal solution, the steering torque of the APM vehicle is reduced by 14.96%~28.15%, and the steering performance of the APM vehicle has been effectively improved. References | Related Articles | Metrics