最新刊期
卷 ， 期 2 ， 2022
- 摘要：In view of the problems of low standardization, variety of spare parts and low intelligence of the electrical system of domestic rail transit vehicles, based on the principles of top-level design of the serialized China standard metro train, the technical application of the electrical system of the subway vehicle was investigated, and the application of the new technology on the subway vehicle was analyzed. The interface specification for the electrical system components of different models was formulated, and a unified standard for the function and performance of the electrical systems of different models was realized, the serialized China standard subway train electrical system platform has been developed, which realized the intelligence, configuration and functional performance upgrade of the electrical system. A safer, smarter and more energy-efficient electrical system platform can lay the foundation for the promotion and application of serialized standard metro train and the construction of smart urban rail.关键词：China standard metro train;electrical system;standardization;intelligence;configuration;urban rail transit
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发布时间：2024-08-02
General
- 摘要：Operating environment plays an important role to the noise inside the subway car. Tunnel environment leads to the increase of noise of the subway car and the rapid decrease of sound comfort, which seriously affects the passengers' physical and mental health and missing drop-off place. At present, the influence of tunnel environment on noise and acoustic comfort inside the subway car is lack of relevant investigation and theoretical research. Based on this, the noise inside and outside a subway on a certain line was measured. Only the sound transmission of wheel-rail source to the subway car through air was considered. Based on the sound ray tracking method, by establishing the acoustic response model of tunnel-subway in Odeon software, the effect of tunnel with sound absorption material on noise and acoustic comfort in subway was studied furtherly. The following conclusion is drawn: in the tunnel section, the total noise inside the subway car increases by 7 dB(A), normal communication distance is reduced to 0.1-0.2 m, and sound comfort is extremely poor. The effect of laying sound absorption material on track plate is better than that of tunnel wall. When the whole tunnel is covered with sound absorbing material, the noise inside the subway car can be reduced by about 6 dB(A), normal communication distance can be increased to 0.72 m, the sound environment in the subway car has been greatly improved .The simulation results can provide certain reference for practical engineering application.关键词：tunnel environment;subway;noise;acoustic comfort;Odeon
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发布时间：2024-08-02 - 摘要：With the development of society and economy, subway vehicles have also become an important infrastructure of modern transportation in China. The heat release rate is an important parameter in the fire protection design, fire safety assessment and tunnel ventilation system design of rail transit vehicles. However, the existing research on the fire combustion characteristics of subway trains cannot reflect the influence of the main components in the vehicle on the fire heat release rate. In order to effectively provide guidance for subway train structure and fire protection design, a numerical calculation model of vehicle fire was established based on the actual structure of serialized Chinese standard metro trains and the combustion characteristic parameters of non-metallic combustible materials in the vehicle were measured by material combustion experiments. Numerical calculation method was used to calculate the fire spread process in the car when the main components of the car were made of materials with different combustion characteristics, and the effects of the four main components of the roof, side walls, seats and floor on the fire heat release rate of the car were compared and analyzed. The research shows that the influence of the main components in the subway car on the heat release rate is related to the order of fire spread and the spatial position of the components, and the influence degree is the roof, side wall, seat and floor.关键词：China standard metro train;fire protection design;heat release rate;train components;combustion characteristics;numerical calculation;numerical simulation
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发布时间：2024-08-02 - 摘要：In order to improve the safety and comfort level of rail vehicles, a control scheme of vehicle grille was presented. When a fire occurred in a train, the spread of flame and poison gas could be prevented and the poison gas discharge could be promoted by opening and closing the air return grille of partition door, air supply grille of driver's cab wind crossing, inlet valve of air conditioning fresh air device and exhaust valve of waste discharge device, so the life safety of passengers and drivers could be protected maximum; When the external pressure of the train fluctuated violently, while the internal space completely was isolated from the external environment, and the driver's cab was also separated from the passenger compartment, if the total pressure decompression time of driver's cab part component was greater than the total pressure decompression time of passenger compartment part component at this time under certain conditions, the fluctuation of the air pressure driver's cab could be reduced and comfort level of driver's cab could be improved, at the same time, the calculation and verification were carried out. The research provides a reference for safety and comfort design of rail vehicles.关键词：rail vehicle;grille;fire;security;air pressure fluctuation;comfort level
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发布时间：2024-08-02 - 摘要：The mechanism of noise generated by rail vehicles in the process of driving is complex. Noise problems not only cause trouble to the comfort of passengers, but also restrict the development and application of rail transit vehicle to a certain extent. Therefore, the research on the noise of standard metro trains has important implications. Through the numerical simulation method, based on the 1:8 scaled model of 3-vehicle marshalling with bogies and without pantograph, using the topology optimization, multi-layer mesh refinement technology, boundary layer mesh technology and mesh stretching technology of the commercial meshing software ICEM to develop refined tetrahedral/triangular prism meshing, the computational domain mesh under the open-line operation was built. The simulation model of the aerodynamic noise of metro train was established, and the aeroacoustics characteristics of the open-line operation under different working conditions of 80 km/h, 120 km/h and 130 km/h were studied. Specifically, the flow field pulsation performance, aerodynamic noise source performance and far-field radiated noise performance of metro trains under different velocity were analyzed, the external flow field and acoustic law of train were researched. The simulated results show that with the increase of train's speed, the sound power level on the surface of the train body, sound source energy and sound pressure level increase gradually. The research on the aerodynamic noise characteristics of metro trains with a speed of 120 kilometers per hour in this paper provides a reference basis for the aeroacoustics optimization design of other metro trains.关键词：metro train;simulation;flow field pulsation;aerodynamic noise source;far-field radiated noise
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发布时间：2024-08-02 - 摘要：According to the design requirements and related standards of standard metro train 80B, a vehicle dynamics model was established. Based on the correlation of vehicle system modal characteristics with running speed and suspension parameters, the sensitivity of different variable factors was analyzed by Fourier amplitude expansion method. The optimal design model was established according to the dynamic index, and the suspension parameters of the primary and secondary series were optimally combined. The optimized suspension parameters were used to evaluate the dynamic performance of the vehicle under different working conditions, and combined with the vehicle track coupling dynamic model, the influence of the vehicle body and bogie modes on vehicle stability and vibration was briefly analyzed. The calculation results show that, based on the optimized suspension parameters, the dynamic performance of the standard metro train 80B meets the standards and design requirements, the coupling between the car body and the bogie is weak, and the vehicle system has a certain safety margin.关键词：standard metro;suspension parameters;modal characteristics;dynamic performance;parameter optimization;simulation;urban rail transit
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发布时间：2024-08-02 - 摘要：To study the "train-tunnel" coupling aerodynamic characteristics of a fast subway train running in a tunnel, full-scale tests were carried out on the Hangzhou-Haining intercity railway to study the pressure changes inside and outside the train when the train passing through the tunnel at the speeds of 100 km/h and 120 km/h. The peak-to-peak values of the pressure and the amplitudes of the pressure change in 3 s and 1.7 s were calculated. The pressure changes inside and outside the train during the process of entering and exiting the tunnel was compared. The influence of the different train formation types and different train speeds on the pressure changes inside and outside the train were analyzed, the relationship between the state of the air conditioners and the interior pressure change was researched. The research results show that the pressure change amplitudes of the rapid subway trains entering and exiting the tunnel are similar; When the train enters and runs in the tunnel, the interior pressure change rate in the tail car is the fastest. The peak-to-peak value of the exterior pressure gradually decreases from the head car to the tail car, while the peak-to-peak value of the interior pressure remains basically unchanged along the length of the vehicle. The comparison of internal and external pressures of trains with different speeds should be carried out in the non-dimensional time. The peak-to-peak value of the pressure inside and outside the train increases, and the pressure change rate accelerates with the increase of the train speed. Turning off the air conditioners could significantly reduce the interior pressure change rate of the train , which provides a reference for comfort research.关键词：fast subway;tunnel;full-scale test;train speed;pressure characteristics;metro train
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发布时间：2024-08-02 - 摘要：Aiming at the unreasonable noise index proposed by a certain project for metro vehicles and equipment, taking a domestic subway line as the test object, noise test under the condition of parking, 25 km/h passing, slow passing and brake at the bend of return depot and analysis of noise characteristics inside and outside of vehicles were carried out, as well as noise test and index analysis of traction inverter were carried out mainly. The results show that under the condition of vehicle parking and running, the contribution of traction inverter noise to the total noise energy outside the vehicle is less than that of motor, gearbox, brake resistance fan and other noise sources. The index of sound power level not exceeding 86 dB(A) proposed for traction inverter and other equipment is relatively reasonable and feasible. Based on the noise test results and analysis of the whole vehicle and equipment, it can provide theoretical guidance for the determination of noise index.关键词：metro vehicles;traction inverter;noise;index;sound power level
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发布时间：2024-08-02
Vehicle Safety and Comfort
- 摘要：Many problems appear as the rapid development of China urban rail transit, such as various vehicle systems, huge number of spare parts and low localization level, which make it be urgent to establish China standard as well as key system in rail transit industry, and put forward higher requirements and bring new challenges for the design of traction system of metro vehicle. Firstly, the research objective and simplification principle of traction system design were detailed, and four standard metro train models with traction and electric braking characteristics were presented, which could cover more than 95% of the demand of metro industry. Through comparison of the main products in the metro industry, a kind of high voltage circuit topology was proposed, which was beneficial to the layout of the whole vehicle equipment, and the main circuit of the permanent magnet synchronous traction system was also simplified. Meanwhile, the key parameters of the main circuit ,the power of motor and chopper resistance were determined through analysis and calculation. By analyzing the mechanism of bearing electrocorrosion, a kind of vehicle grounding circuit structure which could effectively suppress the bearing voltage of traction motor was simplified, and the corresponding grounding resistance was analyzed and determined. Simulation results show that the application requirements of standard metro train could be met according to serialization and simplification of traction system design. In addition, the products of different traction system suppliers could be installed compatibly and the main spare parts could be generalized, which also reduced the maintenance cost of operators.关键词：metro vehicle;standard;traction system;traction characteristics;high voltage circuit;grounding circuit;urban rail transit
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发布时间：2024-08-02 - 摘要：Based on the installation interface requirements and vehicle braking parameters of standard metro train friction pairs, the design development and experimental verification of new lightweight brake friction pairs were carried out through scheme design, calculation and experimental verification, the applicability and the braking matching of the new lightweight brake friction pairs on standard metro train were demonstrated. In the new friction pairs, the brake pads were made of synthetic materials, and the brake discs were made of aluminum-based composite materials, which were prepared by friction stir forming technology. The heat capacity of the brake disc was calculated and checked by simulation analysis, and the safety factor of the brake disc fastener was calculated and checked based on VDI 2230 standard, the results showed that the heat capacity of the new lightweight aluminum matrix composite brake disc and the safety factor of the fastener connection met the requirements of the relevant standards. Test verification of new brake friction pairs was carried out, the results showed that physical and mechanical properties of the aluminum-based composite brake disc and composite brake pad met the standard motro train regulations, the aluminum-based composite brake disc and fastener connection was safe and reliable, met the requirements of vibration and shock test standards. The completed brake friction pair full-scale braking power bench test results show that the average friction coefficient is stable, the brake pad wear is small, the temperature rise of the brake disc is low, and the braking noise is low. The friction pairs has good matching performance. According to the check analysis and test results, new brake friction pairs meets the braking requirements of standard metro train and can be promoted.关键词：standard metro train;drake disc;pad;friction stir forming;calculation check;simulation;test verification;urban rail transit
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发布时间：2024-08-02 - 摘要：Brake control solenoid valve is the key component of rail transit vehicle braking system. In the braking process, the solenoid valves receive the control signal from the electronic control unit and adjust the braking pressure through high-frequency action. In order to ensure the control accuracy of pressure and reduce action times of solenoid valve and prolong its life, the control signal and the dynamic characteristics of solenoid valve are required to match each other. Therefore, it is necessary and significant to study the dynamic response characteristics of brake control solenoid valve. The dynamic simulation model of solenoid valve was established with electromagnetic simulation module. The variation trend of solenoid valve coil current and the action displacement of the iron core during the process of solenoid valve power on and power off was analyzed. The current and pressure response characteristics of solenoid valve during power on and power off were also tested. The test environment was built, and 30 million life tests and the response stability test of solenoid valve in the process were completed. The result shows that: The current response time of brake control solenoid valve is less than 11 ms , and the current variation trend is consistent between simulation and measured results. The pressure response time is less than 15 ms according to GB/T 22107 standard, and with the increase of the number of actions to 30 million times in the test process, the pressure response time is less than 15 ms with good stability, which can meet the requirements of the brake control system. The results of this paper provide a technical basis for the design of solenoid valve control algorithm.关键词：brake control;solenoid valve;electromagnetic simulation;dynamic response;experimental verification
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发布时间：2024-08-02 - 摘要：High quality and sustainable development of urban rail transit is an important part of the construction of transportation power. In recent 10 years, the group has carried out overall product and technological development in the field of car body in the EU and Japan, with global and systematic technical innovation. In order to improve the overall level of China's metro vehicle technology, a series of Chinese standard metro vehicle have been developed by CRRC with support from the relevant ministries. In this paper, the design elements and existing technical system of metro car body were investigated, the importance of car body top-level design and integration technology was analyzed, and the key points of building China standard metro car body technology innovation platform were discussed; The inheritance of standard metro car body structure, design optimization and performance improvement, test verification results and design simplification results were introduced; The direction and goal of technological innovation such as new material, new process and new structure of car body were discussed. The results show that the standard metro car body structure meets the requirements of the technical specifications and can meet the practical application needs of the industry. However, it is still urgent and necessary to carry out forward-looking and basic technical research on the metro car body.关键词：metro train;car body structure;standardization;lightweight;recycling;new material;urban rail transit
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发布时间：2024-08-02 - 摘要：Aiming at the problems of difficult real-time construction of train running forward boundary and complex cluster detection of unstructured track and road environment targets, a lidar based on target detection and forward boundary real-time construction system was proposed. Firstly, the strategy of space for time was adopted to improve the efficiency of rail track extraction, and the rail track was extracted steadily by using the local elevation information, global geometric parallel information and multi-frame information of the rail track. Then, the forward limit of train passage was constructed based on the extracted rail track position in real time. Secondly, based on the point cloud depth map and gradient and distance characteristics, the obstacle clustering problem in non-paved road scenarios was solved, and the track information was used for multi-target tracking to improve the stability of target tracking. By real train test on metro scene, it was proved that the proposed method could extract track position accurately and reliably, it also could detect and track targets.关键词：metro trains;lidar;track extraction;segmentation and clustering;target detection;urban rail transit
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发布时间：2024-08-02 - 摘要：As an important component to carry running train, the working state of the track has an important impact on the safety of the subway operation. Traditional manual detection or rail inspection vehicles can not operate until subway operation ends, leading to low work efficiency. Aiming at this problem, an track line status detection system based on subway passenger trains was proposed. A high frequency line-scanning camera was used to collect real-time images and a lightweight backbone RegNet was used to extract the deep features of track line images. Then, a BiFPN was added to fuse multi-layer features. Finally, the features were send to a object detection head for track line status real-time detection. Combined with the hard sample mining based on cloud-edge collaboration and model acceleration technologies, the algorithm can meet the detection performance of high accuracy and real-time. The experiments show that the mean average precision of detection for 11 types of rail failure and fastener status reaches 0.951, and the inference speed is greater than 20 f/s, which proves that the system can realize real-time track line status detection during the subway passenger operation.关键词：metro vehicles;rail failure;fastener detection;deep learning;cloud-edge collaboration;rail
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发布时间：2024-08-02
Component Development and Test
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Research on axle-box bearing fault feature extraction algorithm based on simulation test and BOA-VMD
摘要：Aiming at the problem that axle-box bearing faults are difficult to find during the operation of urban rail trains, a bearing fault feature extraction based on variational mode decomposition (VMD) parameter optimization using butterfly optimization algorithm (BOA) was proposed. Firstly, a bearing fault dynamic model based on the rigid-flexible coupling of bearing-vehicle was constructed, and the vibration signal of the axle box under the wheel-rail disturbance and the faulty bearing was extracted. Then, the BOA algorithm is used to optimize the VMD modal component number and the second penalty coefficient of the axle box vibration signal, so as to determine the best parameter combination. Finally, by using the determined optimal parameters, the vibration signal of the bearing was decomposed by VMD to obtain different intrinsic mode components (intrinsic mode function, IMF), and an envelope analysis was performed to find the eigen frequencies of bearing failures. Through the experimental analysis, it can be seen that the VMD analysis method of optimizing parameters can effectively find the characteristic frequency of bearing faults, and by comparing the EMD analysis method, it can be found that the analysis method proposed in this paper is more effective.关键词：train bearing;fault feature extraction;variational mode decomposition;BOA;fault diagnosis;simulation- 56
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发布时间：2024-08-02 - 摘要：The problem of exceeding or short of standard line under ATO mode of metro train has always troubled many urban rail transit users, in order to improve the parking accuracy of series standard metro trains under ATO mode, the electric braking force, electric air coordination, air braking preload control, air braking force, brake shoe, brake pad and wheel rail adhesion that affect the vehicle braking performance were analyzed. Combined with the actual operation measurement data of existing trains, it was verified that the exertion accuracy of electric braking force, electric air coordination parameters, air preload, brake shoe, brake pad friction coefficient and surface state, as well as wheel rail surface state will affect the train parking accuracy to varying degrees. Through test debugging and line verification, the braking performance optimization suggestions to improve the automatic parking accuracy of serial standard metro trains were given.关键词：stopping accuracy;braking performance;ATO;subway train;exceeding or short of standard line
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发布时间：2024-08-02 - 摘要：The return performance of metro vehicles in the traction power supply system was analyzed, and an improved design for vehicle grounding was proposed. Since the metro vehicle operation process cannot be accurately and continuously performed by conventional time-domain simulations, a network-vehicle interaction dynamic simulation scheme was proposed for analyzing the grounding return performance of metro vehicles. Taking the two actual metro types, adopting resistor grounding and direct grounding respectively, as the objects of study, comprehensive models consisting of the vehicle body, grounding circuit, traction load, rail return circuit and power supply network were developed in the general simulation environment. Based on the key parameters of the metro line and vehicle, traction calculation results were acquired, and then were imported into the models, which achieved continuous update of the vehicle traction load and associated position, so as to simulate the grounding return distribution during the vehicle operation process. Simulation analysis verified that in the same line with the same traction strategy, the model grounded via protective resistor had less car body-rail return current and inter-car body current than the directly grounded model, but its car body potential was slightly raised. Further, two improved designs based on the resistor grounding scheme were proposed. Simulation results show that both the designs strike a balance between car body return current and potential suppression of a whole metro train. The proposed simulation method is useful for verifying the performance of metro vehicle grounding, and the simulation results can be as a reference for the grounding design.关键词：metro vehicle;grounding return;traction calculation;dynamic simulation
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发布时间：2024-08-02 - 摘要：Subway speed is an important parameter of train control system. The traditional subway speed measurement methods have some defects. In this paper, a new method of subway speed measurement by using the optical flow method in image processing was explored, and a fast optical flow calculation method to meet the requirements of real-time and accuracy of subway speed measurement was put forward. The image pyramid was introduced to solve the optical flow of large displacement motion through the method of coarse to fine and layer by layer refinement, which solved the defect that LK optical flow method could not calculate large displacement motion; GPU was used in optical flow calculation to realize the parallelization of image feature point detection and calculation, which significantly improved the speed of optical flow calculation; The line simulation software was designed for speed measurement simulation experiment. The results show that the improved optical flow algorithm based on image pyramid can improve the accuracy of optical flow estimation under large displacement, and the optical flow parallel calculation based on GPU can effectively improve the optical flow calculation speed and meet the real-time requirements of metro speed measurement system. The feasibility of the speed measurement method in this paper is further verified by building the machine support platform and carrying out the actual line experiment.关键词：metro train;speed measurement;optical flow method;GPU acceleration;real time;simulation
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发布时间：2024-08-02
Key Technology and Materials
- 摘要：The fatigue failure of metro frame may occur at the weld toe and weld root of the welded joint. Therefore, an effective fatigue evaluation method is needed to analyze the fatigue reliability of the bogie comprehensively. To solve this problem, based on the effective notch stress method, the overall finite element model of one metro frame and the local mesh refinement finite element model of the welded joint between the wing plate of the motor suspension seat and the cross beam were established, and the effective notch stress distribution at the weld toe and weld root of the welded joint was obtained. According to Miner damage theory and the corresponding S-N curve, the cumulative damage of effective notch stress method and nominal stress method were calculated. The results show that fatigue failure is more likely to occur at the root of the joint. In addition, the effective notch stress method is safer than the nominal stress method. For further study the influence of different loads on damage, by comparing the cumulative damage results of each load, it was found that for the effective notch stress, the five loads with large damage are torsional load, motor transverse load, motor vertical vibration load, motor driving load and gearbox vertical vibration load, of which the torsional load accounts for the largest proportion, up to 30%-60%. The safety and applicability of the effective notch stress method in the fatigue evaluation of subway vehicle frame was verified.关键词：metro frame;motor hanger;welded joints;effective notch stress;nominal stress;fatigue damage;metro vehicles
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发布时间：2024-08-02 - 摘要：Lightweight and high specific energy absorption device is the key development component of standardized subway train. It is important to enhance the matching design of special energy absorption device to improve the crashworthiness of structure. Without changing the space of existing devices, according to the collision protection parameters of standardized metro trains, three energy dissipation element schemes were designed. Based on the component performance parameters of test, the impact response behaviors of three structures were compared and analyzed by using the full-scale finite element method under the speed of 25 km/h, at last the final optimal design plan was determined. Furtherly, the response surface of energy absorption parameters was constructed by Latin hypercube method. Multi-objective structure optimization and matching design of energy absorbing element was carried out by using non-dominated sorting multi-objective genetic algorithm (NSGA-II). Optimized structural was obtained and checked. The results show that the series honeycomb structure can improve the instability of long-stroke honeycomb in the energy absorption device. The ejector rod honeycomb composite structure can significantly improve the energy absorption characteristics. With the response surface optimization, the energy absorption capacity of standardized subway train energy absorption device was significantly improved.关键词：standardized metro;callision protection;honeycomb structure;energy absorbing and anti- climbing device
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发布时间：2024-08-02 - 摘要：The sealing performance of the vehicle is the key factor affecting the comfort experience of passengers, and the sealing performance of the door system directly determines the sealing performance of the vehicle. Therefore, it is of great significance to improve the sealing performance of the door. The factors affecting the sealing performance of the vehicle were analyzed, such as the blocking ratio and the running speed of the vehicle, and the improvement of the sealing performance of the sliding plug door system was studied combined with the comfort evaluation standard. The method to optimize the sealing performance of the door system by adding restraint limit and improving the rubber strip section was proposed, which was verified by bench pressure charging test. The results show that the sealing performance of the door system can be significantly improved by adding constraints and pneumatic pressure locking at the lower part of the door leaf, and the asymmetric finger protection rubber strip with reverse lip edge also has a certain effect on improving the tightness of the door system, which provides guidance and suggestions for the sealing structure design of door system of serialized China standard metro train.关键词：sealing property;door;comfortable capability;subway;standard metro train
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发布时间：2024-08-02 - 摘要：In order to study the energy absorption and anti-climbing characteristics of aluminum honeycomb anti-climbing device of a certain type of subway vehicle, a reliable finite element model of equivalent aluminum honeycomb anti-climbing device was established by using the nonlinear finite element numerical simulation method. By studying the energy absorption characteristics of the aluminum honeycomb anti-climbing device under different structural parameters, the anti-climbing device was optimized. Finally, the optimized anti-climbing device was applied to the whole vehicle, and the collision condition of the 6-unit vehicle at 25 km/h was simulated. The simulation results show that increasing the thickness of the thin-walled shell greatly increases the initial peak force and the fluctuation of the impact force. The energy absorption effect of honeycomb blocks will be greatly improved by inserting baffles in series between several aluminum honeycomb blocks. It is one of the methods to induce stable and orderly deformation of anti-climbing device when opening induction holes in thin-walled shell. However, excessive number of induction holes will have a negative effect on energy absorption. Through the vehicle collision simulation, it is evaluated according to the relevant requirements of European railway standard EN 15227: 2020, which proves that the anti-climbing device has good energy absorption and anti-climbing performance, and provides a theoretical basis for the application of aluminum honeycomb anti-climbing device in subway vehicles.关键词：subway vehicles;aluminum honeycomb anti-climbing device;energy absorption anti-climbing characteristics;finite element;crashworthiness;simutation
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发布时间：2024-08-02 - 摘要：The wheel/rail coupled vibration modal is an inherent property of the wheel/rail system, and mastering the coupling vibration characteristics between wheel and rail is inevitable and practical to reduce wheel out of round wear and rail corrugation. In this study, a comprehensive coupled vehicle/track dynamic model was established to investigate the influence of vehicle and track parameters on the wheel/rail coupled vibration by using sweep frequency analysis method. The results show that: The wheel rail coupling vibration between vehicle and track is mainly manifested in P2 coupling vibration between wheel/rail and high-frequency wheel rail coupling vibration caused by local deformation of rail between bogie wheel sets, such as first-order, second-order and third-order bending vibration of rail between wheel sets. The P2 rail/wheel coupled vibration frequency ranges from 30 Hz to 100 Hz, depending on the support stiffness and unsprung mass, and with the increase of fastener stiffness, the resonance amplitude and frequency of wheel rail P2 coupling increase. For the high frequency range, the wheel rail high-frequency coupled vibration is mainly dominated by the 3rd rail bending mode of rail between wheel sets and Pinned-Pinned vibration. When the vibration frequency is less than 1 000 Hz, the third-order bending of rail between wheel sets is the main driving force of wheel rail high-frequency vibration, which is mainly related to the wheel base, damping of rail fastener system, and sleeper spacing.关键词：wheel/rail P2-coupled vibration;sweep frequency analysis;high frequency vibration of wheel/rail coupled;sleeper spacing;track;metro vehicles
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发布时间：2024-08-02
Structure Design and Simulation
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