A method and device for preventing high-speed train from overturning in strong wind environment

Abstract

The present invention provides a method and device for preventing high-speed trains from overturning in strong wind environments. When encountering a crosswind, an aerodynamic separation is performed on the leeward side of the train to disrupt the flow field on the leeward side of the train, increase the surface pressure on the leeward side of the train, reduce the pressure difference between the windward and leeward sides of the train, and reduce the aerodynamic lateral force of the train. At the same time, the velocity difference between the upper and lower airflows forms an upward aerodynamic lift, which together reduce the overturning moment of the train. The present invention effectively reduces the overturning moment of the train by opening part of the plate-like structure on the leeward side of the train, realizing an anti-overturning design for high-speed trains in strong wind environments and ensuring the operational stability and safety of high-speed trains. When the train is running normally, the plate-like structure can form part of the side of the car body, without affecting the aerodynamic effect of the train during normal running. The method is simple and feasible, and has important practical engineering significance.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed train operation safety, and in particular to a method and device for preventing a high-speed train from overturning in a strong wind environment. Background Art

[0002] Crosswinds significantly degrade the aerodynamic performance of high-speed trains, dramatically increasing the train's aerodynamic lateral force and lift. The combined effect of these forces increases the overturning moment, creating significant uncertainty for safe train operation. Therefore, it is necessary to study how to reduce the overturning moment in high winds to improve operational safety and ensure efficient train operation.

[0003] Existing methods for coping with crosswind conditions primarily include establishing high-wind monitoring systems, determining safe operating limits for trains, optimizing the train's aerodynamic shape, and constructing windbreaks. These methods, while not only time-consuming and costly, also reduce train operating efficiency, and as train speeds increase, the associated R&D costs increase significantly. Therefore, finding a simple and feasible method to improve the crosswind stability of high-speed trains is crucial for their safe operation. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the above-mentioned background technology and provide a method for preventing high-speed trains from overturning in strong wind environments. While ensuring the improvement of the crosswind stability of high-speed trains, it is also simple and feasible and has important practical engineering significance.

[0005] In order to achieve the above-mentioned objectives, the present invention provides a method for preventing high-speed trains from overturning in a strong wind environment. When encountering a crosswind, aerodynamic separation is performed on the leeward side of the train to disrupt the flow field on the leeward side of the train, increase the pressure on the leeward side of the train, reduce the pressure difference between the windward side and the leeward side of the train, reduce the aerodynamic lateral force of the train, and at the same time, the flow velocity difference between the upper and lower layers of airflow forms an upward aerodynamic lift, which together reduce the overturning moment of the train.

[0006] Furthermore, the plate-like structure is deployed to perform aerodynamic separation of the upper and lower layers and aerodynamic turbulence on the leeward side of the train.

[0007] Furthermore, the unfolding angle of the plate-like structure ranges from 0° to 135°.

[0008] Furthermore, the optimal unfolding angle of the plate-like structure is 120°.

[0009] The present invention also provides an anti-overturning device for high-speed trains in strong wind environments, which adopts a high-speed train anti-overturning method in strong wind environments as described above, including a rotating plate and an opening and closing drive mechanism. The rotating plate is hinged to the side panel of the vehicle body, and the rotating plate is part of the side of the vehicle body. When the rotating plate is folded, it is seamlessly spliced with the side panel of the vehicle body, and does not affect the aerodynamic effect during normal driving of the train. The output end of the opening and closing drive mechanism is connected to the rotating plate.

[0010] Furthermore, an axis hole is provided on the edge of the rotating plate, a hinge shaft is installed in the axis hole, and the hinge shaft is connected to the side plate of the vehicle body.

[0011] Furthermore, the opening and closing drive mechanism includes a first support, a cylinder and a second support, the first support is installed on the inner side of the rotating plate, the first support is hinged to the piston rod end of the cylinder, the second support is installed in the first mounting groove opened in the vehicle body side panel, and the second support is hinged to the cylinder bottom of the cylinder.

[0012] Furthermore, a second mounting groove is provided on the vehicle body side panel, and the second mounting groove matches the shape of the rotating plate, and the second mounting groove is used to accommodate the rotating plate.

[0013] The above solution of the present invention has the following beneficial effects:

[0014] The present invention provides a method and device for preventing high-speed trains from overturning in strong wind environments. By opening part of the plate-like structure on the leeward side of the train, a spoiler flow field effect is formed on the leeward side of the train, thereby increasing the pressure on the leeward side of the train, thereby alleviating the pressure difference between the windward side and the leeward side of the train and reducing the aerodynamic lateral force of the train. At the same time, the plate-like structure itself forms an upward aerodynamic lift due to the velocity difference caused by the upper and lower divisions of the flow field on the leeward side of the train. The combined action of the two effectively reduces the overturning moment of the train, realizes the anti-overturning design of the high-speed train in strong wind environments, and ensures the operational stability and safety of the high-speed train. When the train is running normally, the plate-like structure can constitute a part of the side of the car body, which will not affect the aerodynamic effect of the train during normal running. The method and device are simple and feasible, and has important practical engineering significance.

[0015] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the installation structure of the rotating plate of the present invention;

[0018] Figure 3 It is a schematic diagram of the rotating plate structure of the present invention;

[0019] Figure 4 2 is a comparison chart of the aerodynamic performance of the original model and the plate structure model in an embodiment of the present invention.

[0020] [Description of Reference Numerals]

[0021] 1-rotating plate; 2-body side panel; 3-first support; 4-cylinder; 5-second support; 6-first mounting slot; 7-second mounting slot. DETAILED DESCRIPTION

[0022] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0023] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0024] It should also be noted that the diagrams provided in the following embodiments are merely schematic illustrations of the basic concepts of the present disclosure. The diagrams only show components relevant to the present disclosure and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the configuration, quantity, and proportion of each component may be varied at will, and the component layout may be more complex. Furthermore, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will appreciate that the described aspects may be practiced without these specific details.

[0025] like Figure 1As shown, an embodiment of the present invention provides a method for preventing high-speed trains from overturning in strong winds. The method uses a plate-like structure to separate the train's two side walls. When a high-speed train encounters strong winds, the plate-like structure on the leeward side is rotated 0° to 135° and unfolded. The outward-facing plate-like structure disrupts the flow field on the leeward side of the train, increasing the pressure on the leeward side. While maintaining minimal pressure distribution on the windward side, the pressure difference between the windward and leeward sides of the train is alleviated, reducing the aerodynamic lateral force and, consequently, the train's overturning moment.

[0026] At the same time, in the flow field on both sides of the train, the flow velocity of the upper layer is greater than that of the lower layer. Through the arrangement of the plate structure, the flow field on the leeward side of the train is divided into upper and lower parts. The resulting flow velocity difference forms an upward aerodynamic lift, thereby increasing the aerodynamic lift of the train through the plate structure, that is, increasing the magnitude of the resistance moment against crosswind overturning, thereby reducing the overturning moment of the train.

[0027] It is understandable that, because crosswinds can blow towards the train from both sides, plate structures need to be placed on both sides of the train, or in other words, the plate structures can be deployed on both sides of the train. When encountering a crosswind, the plate structures on the windward side do not deploy and therefore have no effect. The plate structures on the leeward side deploy and continue to operate normally, changing the airflow on the leeward side of the vehicle body to reduce lateral force, generate lift and form a resisting torque, ensuring the effect of offsetting the crosswind torque.

[0028] The feasibility of this invention is proved by numerical simulation. Figure 1 As shown in Table 1, four angle conditions are set for calculation, namely, the plate structure extends 60°, 90°, 120° and 135°. Figure 4 As can be seen, increasing the outward extension angle of the plate structure reduces the train's lateral force, increases the aerodynamic lift on the leeward side of the train, and reduces the train's overturning moment, thus achieving the goal of preventing high-speed trains from overturning. When the plate structure is extended to an angle of 120°, the lateral force coefficient is reduced by 15.5% and the overturning moment coefficient is reduced by 21.6%, which is significantly better than other angles and ensures the stability and safety of high-speed train operation.

[0029] Table 1 Comparison of aerodynamic performance between the original model and the plate structure model (60°)

[0030] Lateral force coefficient lift coefficient Overturning moment coefficient Original train 3.61 3.78 1.85 Plate structure outward (60°) 3.47 3.87 1.71 Optimization effect 3.9％ -2.1％ 7.6％

[0031] Table 2 Comparison of aerodynamic performance between the original model and the plate structure model (90°)

[0032]

[0033]

[0034] Table 3 Comparison of aerodynamic performance between the original model and the plate structure model (120°)

[0035] Lateral force coefficient lift coefficient Overturning moment coefficient Original train 3.61 3.78 1.85 Plate structure outward extension (120°) 3.05 4.72 1.45 Optimization effect 15.5％ -25.0％ 21.6％

[0036] Table 4 Comparison of aerodynamic performance between the original model and the plate structure model (135°)

[0037] Lateral force coefficient lift coefficient Overturning moment coefficient Original train 3.61 3.78 1.85 Plate structure outward extension (135°) 3.06 4.43 1.48 Optimization effect -15.2％ 17.2％ -20.0％

[0038] At the same time Figure 2 、 Figure 3 As shown, based on the same inventive concept, this embodiment also provides an anti-overturning device for high-speed trains in strong wind environments, including a rotating plate 1, which is installed on both sides of the train body and can be regarded as an added structure or as a part of the side of the body. Preferably, it is regarded as a part of the side of the body, that is, it is combined with the side panel 2 of the body to form the side of the body. When it is in the non-working retracted state, it can ensure the integrity of the side of the body and will not protrude or sink relative to the side panel 2 of the body.

[0039] Among them, the rotating plate 1 is in the form of a flat plate. When it is in the retracted state, it can be seamlessly spliced with the car body side panel 2 to form an integrated structure. On the one hand, it will not affect the aerodynamic effect during normal driving of the train. On the other hand, it will not be affected when passing through tunnels and other locations. Compared with other forms of aerodynamic spoiler structures, its deployment and retraction control is more convenient, and the impact on the aerodynamic performance of the train is minimal when retracted.

[0040] The rotating panel 1 is extended or retracted by the opening and closing drive mechanism. A pivot hole is provided on the edge of the rotating panel 1, through which a hinge shaft is installed, which is hinged to the vehicle side panel 2, allowing it to rotate relative to the vehicle side panel 2 and rotate to a preset angle under the drive of the opening and closing drive mechanism.

[0041] In this embodiment, the opening and closing drive mechanism includes a first support 3, a cylinder 4, and a second support 5. The first support 3 is mounted on the inner side of the rotating plate 1 and is hingedly connected to the piston rod end of the cylinder 4. The second support 5 is mounted in a first mounting slot 6 defined in the vehicle side panel 2 and is hingedly connected to the bottom of the cylinder 4. Therefore, the extension and retraction of the cylinder 4 drives the rotating plate 1 to rotate about the hinge axis, thereby extending or retracting the rotating plate to a predetermined angle.

[0042] It is understood that since windows are required on the sides of the train, it is best for the rotating plate 1 to be located below the windows when deployed, so as not to block them. Therefore, in this embodiment, the hinge axis of the rotating plate 1 is connected to the middle of the side panel 2 of the vehicle body, below the lower edge of the window, so that the rotating plate 1 does not block the window when deployed.

[0043] As a further improvement, in this embodiment, the vehicle body side panel 2 is further provided with a second mounting groove 7, which is used to accommodate the rotating plate 1, so that the rotating plate 1 can enter the second mounting groove 7 when it is retracted. It should be noted that the shape of the second mounting groove 7 is consistent with that of the rotating plate 1, so that the rotating plate 1 can completely cover the second mounting groove 7 when it is retracted. The rotating plate 1 and the vehicle body side panel 2 form a continuous streamlined shape on the side of the train, which minimizes the impact on the aerodynamic effect during normal train operation.

[0044] It is understood that in this embodiment, the control system is required to control the extension and retraction of cylinder 4. When the train is running normally, the control system controls cylinder 4 to be in a retracted state, causing rotating plate 1 to be retracted. When a crosswind occurs, the control system transmits a signal via the electronic control circuit to control the inflation of cylinder 4, thereby increasing the pressure in cylinder 4 and driving rotating plate 1 to expand and reach the working state. After the crosswind ends, the control system transmits a signal via the electronic control circuit to control the exhaust of cylinder 4, which depressurizes cylinder 4 and causes rotating plate 1 to retract, ensuring the normal operation of the train.

[0045] In summary, this solution forms a spoiler flow field effect on the leeward side by opening part of the plate structure on the leeward side of the train, thereby increasing the pressure on the leeward side of the train, thereby alleviating the pressure difference between the windward and leeward sides of the train and reducing the aerodynamic lateral force of the train. At the same time, the plate structure itself forms an upward aerodynamic lift due to the flow velocity difference caused by the upper and lower divisions of the flow field on the leeward side of the train. The combined effect of the two effectively reduces the overturning moment of the train, realizes the anti-overturning design of the high-speed train in strong wind environment, and ensures the stability and safety of high-speed train operation.

[0046] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for preventing high-speed trains from overturning in strong wind environments, characterized in that: When encountering a crosswind, the upper and lower layers of air are aerodynamically separated on the leeward side of the train to disrupt the flow field on the leeward side of the train, increase the pressure on the leeward side of the train, reduce the pressure difference between the windward and leeward sides of the train, and reduce the aerodynamic lateral force of the train. At the same time, the velocity difference between the upper and lower layers of airflow forms an upward aerodynamic lift, which together reduce the overturning moment of the train. By deploying the plate-like structure, aerodynamic separation and aerodynamic turbulence are carried out on the leeward side of the train. When encountering crosswinds, the plate-like structure on the windward side does not deploy, while the plate-like structure on the leeward side deploys to maintain normal operation, changing the airflow on the leeward side of the vehicle body to reduce lateral force, generate lift and form a resisting torque.

2. The method for preventing a high-speed train from overturning in a strong wind environment according to claim 1, characterized in that: The unfolding angle range of the plate structure is 0° to 135°.

3. The method for preventing a high-speed train from overturning in a strong wind environment according to claim 2, characterized in that: The optimal expansion angle of the plate structure is 120°.

4. A high-speed train anti-overturning device in a strong wind environment, using a high-speed train anti-overturning method in a strong wind environment as claimed in any one of claims 1 to 3, characterized in that: It includes a rotating plate and an opening and closing drive mechanism. The rotating plate is hinged to the side panel of the vehicle body, and the rotating plate is part of the side of the vehicle body. When the rotating plate is folded, it is seamlessly spliced with the side panel of the vehicle body, which does not affect the aerodynamic effect during normal travel of the train. The output end of the opening and closing drive mechanism is connected to the rotating plate.

5. The anti-overturning device for high-speed trains in strong wind environments according to claim 4 is characterized in that: An axis hole is provided on the edge of the rotating plate, a hinge shaft is installed in the axis hole, and the hinge shaft is connected to the side plate of the vehicle body.

6. The anti-overturning device for high-speed trains in strong wind environments according to claim 4, characterized in that: The opening and closing drive mechanism includes a first support, a cylinder and a second support. The first support is installed on the inner side of the rotating plate, and the first support is hinged to the end of the piston rod of the cylinder. The second support is installed in the first mounting groove opened on the vehicle body side panel, and the second support is hinged to the cylinder bottom of the cylinder.

7. The anti-overturning device for high-speed trains in strong wind environments according to claim 6, characterized in that: The vehicle body side panel is further provided with a second mounting groove, which matches the shape of the rotating plate and is used to accommodate the rotating plate.

Images