Wind tunnel test model for high-speed train

Abstract

The invention relates to the field of wind tunnel tests, in particular to a high-speed train wind tunnel test model which comprises a first model which comprises a first model area and a second model area and is provided with a plurality of carbon tube supports, a first supporting plate and a second supporting plate, the first supporting plate and the second supporting plate are matched with carbon tubes, and a third supporting plate is further arranged at the connecting position of the first model area and the second model area. The first end of the second model area is provided with a first sealing plate used for being opposite to an adjacent model. The third supporting plate is provided with a first hollow area and a second hollow area which are in a semi-circular shape. The arc-shaped edges of the first hollow area and the second hollow area are oppositely arranged; the second model is arranged between the two first models and comprises a plurality of carbon tubes and a fourth supporting plate arranged along the carbon tubes; second sealing plates are arranged at the two ends of the second model correspondingly. The invention provides a lightweight and high-strength high-speed train wind tunnel test model. The lightweight structural design can effectively reduce the aerodynamic force measurement test difficulty of a'body dynamic and wind static 'dynamic model.

Description

Technical Field

[0001] The invention relates to the field of wind tunnel tests, and in particular to a high-speed train wind tunnel test model. Background Art

[0002] In the prior art, the train model used in the wind tunnel test usually adopts a steel frame body design. For example, patent CN103674473A discloses a train model for wind tunnel test. The train model includes a body and a head section, wherein a first positioning plate is provided on the surface of the body for bonding with the head section, and a second positioning plate is provided on the surface of the head section for bonding with the body, and a positioning groove is provided on one of the first positioning plate and the second top plate, and a positioning boss matched with the positioning groove is provided on the other. During installation, the head section and the vehicle body are pre-positioned through the cooperation of the positioning boss and the positioning groove to improve the precise positioning and installation of the vehicle body and the head section.

[0003] For another example, patent CN205103002U discloses a train wind tunnel test model support device and a train model. The train wind tunnel test model support device includes a support part, a main body part and a balance mounting part. The support part is arranged below the main body part, and the balance mounting part is arranged above the main body part. The support part includes a plurality of supports, each of which passes through the bogie wheelset, and the support and the bogie wheelset have no contact. The train model is supported by multiple supports, and multi-point support can make the train model more stable and reduce the measurement error caused by the shaking of the train model.

[0004] However, the main model structural designs of the above-mentioned trains all adopt a steel frame design, which has very high test costs and test difficulty (the car body is too heavy). Summary of the invention

[0005] The purpose of the present invention is to provide a high-speed train wind tunnel test model, which partially solves or alleviates the above-mentioned deficiencies in the prior art, and can effectively ensure the rigidity of the train model and improve the accuracy of the force measurement test on the basis of reducing the total weight of the train model.

[0006] In order to solve the above-mentioned technical problems, the present invention specifically adopts the following technical solutions: a high-speed train wind tunnel test model, comprising:

[0007] A first model, the first model comprising: a first model area and a second model area, A plurality of brackets are arranged in the first model area and the second model area, and the first model area and the second model area are respectively provided with at least one first support plate and a second support plate matched with the brackets, and a third support plate is also arranged at the connection between the first model area and the second model area; a first closing plate for being opposite to an adjacent model is arranged at the first end of the second model area; wherein a first hollow area and a second hollow area in a semicircular shape are arranged on the third support plate; the arcuate edges of the first hollow area and the second hollow area are arranged relatively to each other, so that a first support area in a triangular shape is reserved between at least one arcuate edge of the first and second hollow areas and the third support plate, and a second support area in a quadrilateral shape is reserved between the straight-line edges of the first and second hollow areas and the edge of the third support plate;

[0008] At least one second model is arranged between two first models, and the second model includes: a plurality of brackets, and at least one fourth support plate arranged along the brackets; second sealing plates are respectively arranged at both ends of the at least one second model, and the second sealing plates are used to connect with adjacent models.

[0009] In some embodiments, a third hollow area in a quasi-circular shape is provided on the second support plate, and a third support area is reserved between the edge of the third hollow area and the second support plate, and the width of the third support area is smaller than the width of the first support area or the second support area.

[0010] In some embodiments, the first support board is a padded foam board.

[0011] In some embodiments, the first model and the second model are covered with skins on the outside, and the skins are carbon fiber foam sandwich skins.

[0012] In some embodiments, a force measuring module is disposed in the center of gravity region of at least one model.

[0013] In some embodiments, one of the sealing plates is provided with a recessed area, and another sealing plate corresponding to the sealing plate is provided with a raised area corresponding to the recessed area; When the two models are connected, the two sealing plates cooperate to form a gas drainage channel.

[0014] In some embodiments, the gas drainage channel is sequentially formed with a first channel, a first buffer channel, a second channel, a second buffer channel and a third channel along the gas flow direction; wherein, when the gas moves along the first channel to the first buffer channel at a first flow velocity, the gas is reduced from the first flow velocity to the second flow velocity under the action of the first buffer channel, and when the gas passes through the second channel and the second buffer channel in sequence, the gas is reduced from the second flow velocity to the third flow velocity again, and the angle between the first or second buffer channel and the vertical direction is 120°-145°.

[0015] In some embodiments, the width of the gas drainage channel is 5 mm-10 mm.

[0016] In some embodiments, the length of the first channel or the third channel is 1 / 4-1 / 3 of the length of the gas drainage channel.

[0017] In some embodiments, the support is a carbon tube.

[0018] In traditional wind tunnel tests, the "static body and dynamic wind" test mode is usually adopted. That is, the train model remains relatively still, and the airflow is used to simulate the wind resistance encountered by the train during travel. However, the "static body and dynamic wind" test mode is contrary to the actual operation of the train, so it is difficult to accurately reflect the actual stress state of the train. In this regard, the present application will propose a new train test model design for the new "dynamic body and static wind" wind tunnel test mode. However, the original train model is heavy and difficult to meet the "body movement" requirements, and the inertial interference is too large, so that the original frame design is also difficult to ensure the balance force measurement accuracy during high-speed body movement. In this regard, the present invention proposes a new train model frame structure design.

[0019] Different from the model structure obtained by traditional steel skeleton and welding process design, the present invention adopts a new sandwich skin combined with a decentralized weight-reducing and load-bearing design, and adopts different layouts of weight-reducing and load-bearing structures and materials for different key nodes (such as the connection section of the first and second model areas, the end of the model or the middle area of ​​the model). And this decentralized weight-reducing and load-bearing design can not only effectively reduce the weight of the train model, and thus reduce the driving pressure of "body movement"; at the same time, this weight-reducing frame structure design also unexpectedly improves the sensitivity of the balance force measurement, so as to accurately measure the force when the model moves at high speed.

[0020] It is worth noting that, unlike the traditional steel skeleton process, the distributed weight reduction and load-bearing scheme in the present invention designs a specific weight reduction process for each node to achieve a differential weight reduction and load-bearing layout at multiple locations. And this differential weight reduction and load-bearing can reduce the weight of the frame design to a large extent, while ensuring that the frame can maintain good stability during high-speed movement, and help provide a stable force measurement environment for the balance force measurement.

[0021] The traditional single-group model design weight is about 300 kg, while the differential weight reduction and load-bearing scheme in this application can control the model weight to around 120kg-150kg. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, The following is a brief introduction to the drawings required for use in the embodiments or prior art descriptions. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without paying creative labor.

[0023] Figure 1 is a schematic diagram of the appearance of a train model in an exemplary embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a framework of a train model in an exemplary embodiment of the present invention;

[0025] Figure 3a A schematic diagram of a weight reduction design of a support plate in an exemplary embodiment of the present invention;

[0026] Figure 3b It is a schematic diagram of a weight-reducing and load-bearing design of a fifth support plate in an exemplary embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a first model in an exemplary embodiment of the present invention;

[0028] Figure 5a is a schematic structural diagram of a second model in an exemplary embodiment of the present invention;

[0029] Figure 5b It is a structural schematic diagram of a force measuring module according to an exemplary embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of a gas drainage channel in a first exemplary embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the gas drainage channel in the second exemplary embodiment of the present invention.

[0032] Summary of reference numerals:

[0033] 10 is the first model, 11 is the first model area, 12 is the second model area, 13 is the bracket, 14 is the first support frame, 15 is the second support frame, 151 is the third hollow area, 152 is the third support area, 16 is the third support frame, 161 is the first hollow area, 162 is the second hollow area, 163 is the first support area, and 164 is the second support area; 17 is the first sealing plate, 20 is the second model, 21 is the fourth support frame, 22 is the second sealing plate, 223 is the gas drainage channel, 223a is the first channel, 223b is the first buffer channel, 223c is the second channel, 223d is the second buffer channel, 223e is the third channel, 23 is the fifth support plate, 231 is the fifth hollow area, 232 is the sixth hollow area, and 233 is the installation area; 30 is a force measuring module, 31 is a cover support, 32 is a balance connecting piece, 33 is a force measuring balance; 34 is a balance base; 40 is a skin, 50 is a lift wing; 51 is a lift wing mounting seat, and 52 is a lift wing mounting seat fixing piece. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Herein, terms such as “module,” “component,” or “modules” are used to refer to elements. The suffix of "unit" is only for facilitating the description of the present invention, and has no specific meaning by itself. Therefore, "module", "component" or "unit" may be used interchangeably.

[0036] In this document, the terms "upper", "lower", "inner", "outer", "front", The directions or positional relationships indicated by "rear", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In this document, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Herein "and / or" includes any and all combinations of one or more of the associated listed items.

[0039] Herein, "plurality" means two or more than two, ie, it includes two, three, four, five, etc.

[0040] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the sentence “Comprising a…” defined element does not exclude the existence of other identical elements in the process, method, article or device comprising the element.

[0041] As used in this specification, the term "about" typically means + / - 5% of the stated value, more typically + / - 4% of the stated value, more typically + / - 3% of the stated value, more typically + / - 2% of the stated value, even more typically + / - 1% of the stated value, and even more typically + / - 0.5% of the stated value.

[0042] In this specification, some embodiments may be disclosed in a format of being in a certain range. It should be understood that such descriptions of "being in a certain range" are merely for convenience and brevity, and should not be interpreted as a rigid limitation on the disclosed range. Therefore, the description of a range should be considered to have specifically disclosed all possible sub-ranges and independent numerical values ​​within this range. For example, the description of a range of 1-6 should be considered to have specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within this range, such as 1, 2, 3, 4, 5 and 6. The above rules apply regardless of the breadth of the range.

[0043] In this article, "quasi-circle" refers to a geometric figure whose outer edge is connected by multiple arc segments to form a circle-like shape. For example, in this article, "quasi-circle" can refer to a circle, an ellipse, or a geometric figure whose at least part of the edge is circular or elliptical. For another example, "quasi-circle" can refer to a regular geometric figure whose outer edge is connected by multiple regular arc segments, or it can refer to an irregular geometric figure generated due to manufacturing error or measurement error.

[0044] Herein, "quasi-semicircle" refers to a geometric figure having only a partial structure similar to a circle. In particular, the quasi-semicircle may refer to a semicircle or a semi-ellipse. For example, the quasi-semicircle includes at least one straight line and at least one arc connected.

[0045] In this article, "quasi-straight line" refers to a straight line or a line that is approximately a straight line.

[0046] For the aerodynamic lift increase test of the lift wing under the limit constraint conditions of high-speed railway, It is mainly used to measure the lift increment generated by the lift wing. However, the original car body model is heavy and easily exceeds the measurement range of the balance. Therefore, in order to improve the force measurement accuracy of the balance, the present invention proposes a lightweight train model.

[0047] like Figure 1-Figure 7 As shown, the present invention provides a high-speed train wind tunnel test model. include:

[0048] The first model 10 includes: a first model area 11 and a second model area 12, wherein a plurality of brackets 13 are arranged in the first model area and the second model area, and the first model area and the second model area are respectively provided with at least one first support plate 14 and a second support plate 15 matched with the brackets, and a third support plate 16 is also arranged at the connection between the first model area and the second model area; a first end of the second model area is provided with a first sealing plate 17 for being opposite to an adjacent model; wherein,

[0049] The model frames in the present invention all adopt a distributed weight-reducing load-bearing design to achieve a differential load-bearing layout at each key node of the train model, thereby minimizing the total weight of the model and ensuring the rigidity and stability of the model under high-speed movement.

[0050] The third support plate 16 is provided with a first hollow area 161 and a second hollow area 162 in a semicircular shape; the arc edges of the first hollow area 161 and the second hollow area 162 are arranged opposite to each other, so that a first support area 163 in a triangular shape is reserved between at least one arc edge of the first and second hollow areas and the third support plate 16, and a second support area 164 in a quadrilateral shape is reserved between the straight-line edges of the first and second hollow areas and the edge of the third support plate;

[0051] like Figure 3a As shown, the present embodiment provides a weight-reducing and load-bearing solution of reversely arranged hollow areas, wherein the two semicircular-like arrangements of the first hollow area and the second hollow area are reversely arranged, which, on the one hand, can achieve a greater degree of weight reduction through the hollow areas; on the other hand, on the basis of expanding the area of ​​the hollow areas over a larger range, the adjacent edges of the reversely arranged hollow areas cooperate with the edges of the third support plate to reserve a wider support area (preferably, no hollow area for weight reduction is arranged) to ensure that the support plates in the key connection areas have higher rigidity and can withstand higher loads.

[0052] At least one second model 20 is arranged between two first models, and the second model includes: a plurality of brackets, and at least one fourth support plate 21 arranged along the brackets; second sealing plates 22 are respectively arranged at both ends of the at least one second model, and the second sealing plates are used to connect with adjacent models.

[0053] like Figure 2 As shown, in some embodiments, the first model area 11 is used to simulate an arc-shaped body section, that is, to simulate the front part or the rear part of the train. For example, the size of the cross section of the first model area gradually increases along the direction from its first end to the second end (for connecting the second model area). The second model area connected to the second end of the first model area is used to simulate the main body of the body (such as a car body that is approximately a cube or a rectangular parallelepiped).

[0054] For example, in some embodiments, the complete train model is provided with a first model, a second model and a first model from the beginning to the end, which are used to simulate the front car, the middle car and the rear car respectively.

[0055] like Figure 3a As shown, in some embodiments, a third hollow area 151 in a quasi-circular shape is provided on the second support plate 15, and a third support area 152 is reserved between the edge of the third hollow area and the second support plate, and the width of the third support area 152 is smaller than the width of the first support area or the second support area.

[0056] In some embodiments, the total area of ​​the hollow regions in the support plate is approximately 60%-75% of the total area of ​​the support plate.

[0057] In some embodiments, the first support board is a padded foam board.

[0058] In some embodiments, a force measuring module is disposed inside the second model area, the force measuring module is disposed between the two support plates, and the force measuring module includes: a set of fifth support plates 23 (such as Figure 3b As shown), at least two fifth hollow areas 231 of a circular shape are provided in the upper area of ​​the fifth support plate, and an installation area is reserved between two adjacent fifth hollow areas, and the installation area is used to install the balance connecting member 32, and both ends of the balance connecting member 32 are fixedly installed in the installation areas 233 on both sides through mounting members;

[0059] A sixth hollow area 232 of a circular shape is further provided in the lower area of ​​the fifth support plate, and the area of ​​the sixth hollow area is larger than that of the fifth hollow area.

[0060] See also Figure 2 As shown, the first model area is sequentially provided with two (or more) foam filling plates, while the second model area is sequentially provided with a third support plate, a force measuring module, a second support plate, and a sealing plate with a rectangular protrusion. Among them, this decentralized differential weight-reducing and load-bearing design can achieve weight reduction of the lead car and tail car models to a large extent. And the differential design enables the lead car model to have reliable rigidity and stronger stability in the curved surface part and the part adjacent to the middle car.

[0061] In some embodiments, four mounting holes for mounting the bracket are arranged around the support plate.

[0062] In some embodiments, the first model and the second model are covered with skins on the outside, and the skins are carbon fiber foam sandwich skins.

[0063] In some embodiments, a force measuring module is provided in the center of gravity area of ​​at least one model. The force measuring module is provided between the two support plates, and the force measuring module comprises: a set of fifth support plates 23 (such as Figure 3b As shown), at least two fifth hollow areas 231 of quasi-circular shape are arranged in the upper area of ​​the fifth support plate, and an installation area is reserved between two adjacent fifth hollow areas, and the installation area is used to install the balance connecting member 32, and the two ends of the balance connecting member 32 are fixedly installed in the installation areas on both sides by means of mounting members;

[0064] The lower area of ​​the fifth support plate is also provided with a sixth circular hollow area. And the area of ​​the sixth hollow region is larger than that of the fifth hollow region.

[0065] For example, in some embodiments, Figure 2 , Figure 5a As shown, in the second model (also known as the CRRC model), a second support plate is provided on each side of the force measuring module, and the second support plate adopts an overall hollow area design, while the two sides of the force measuring module adopt a discrete hollow area design (that is, each hollow area is independent of each other). Furthermore, rectangular-shaped raised areas (or recessed areas) are designed on the baffles at both ends of the second model. In this embodiment, the sequentially differentiated designs of the rectangular-shaped raised areas, the overall hollow areas, and the discrete hollow areas can effectively reduce the total weight of the CRRC model, while ensuring the internal structural stability and force measurement stability of the CRRC model when running at high speed.

[0066] In some embodiments, the support plate is a metal plate, such as an aluminum alloy plate.

[0067] like Figure 6 and Figure 7 As shown, in some embodiments, one of the sealing plates is provided with a recessed area 221, and the other sealing plate corresponding to the sealing plate is provided with a raised area 222 corresponding to the recessed area; wherein, when the two models are connected, the two sealing plates cooperate to form a gas drainage channel 223.

[0068] In some embodiments, the gas drainage channel is sequentially formed with a first channel 223a, a first buffer channel 223b, a second channel 223c, a second buffer channel 223d and a third channel 223e along the gas flow direction; wherein, when the gas moves along the first channel 223a to the first buffer channel at a first flow velocity, the gas is reduced from the first flow velocity to the second flow velocity under the action of the first buffer channel, and when the gas passes through the second channel and the second buffer channel in sequence, the gas is reduced from the second flow velocity to the third flow velocity again, and the angle α between the first or second buffer channel and the vertical direction is 120°-145°.

[0069] In some embodiments, the width of the gas drainage channel is 5 mm-10 mm.

[0070] In some embodiments, the length of the first channel or the third channel is 1 / 4-1 / 3 of the length of the gas drainage channel. The sealing plate design in this embodiment can effectively alleviate the occurrence of gas cross-talk between the sealing plates in the side deviation state.

[0071] In some embodiments, the support is a carbon tube.

[0072] In some embodiments, the recessed area 221 is preferably configured in a square or quasi-square shape. The raised area is also configured to have a corresponding square or quasi-square shape.

[0073] Among them, "square" includes polygons with adjacent side angles of about 90° or close to 90°, for example, a square is a four-sided square, such as a square, or a rectangle. Of course, the "square" in this article does not necessarily need to be set as a standard square, rectangle or other polygon. For example, the opposite sides of the "quadrilateral" in the square can be parallel or non-parallel, and correspondingly, the adjacent sides of the "quadrilateral" can be perpendicular to each other or non-perpendicular. "Quasi-square" includes a square with chamfered corners at the adjacent side angles, or a square with adjacent sides connected by arcs, for example, a quasi-quadrilateral, such as a quasi-rectangle (the top corners of the rectangle are replaced with arc structures), a quasi-square (such as replacing the top corners of the square with arc structures), etc.

[0074] Preferably, the concave area and the convex area may be a quasi-rectangular structure.

[0075] In this embodiment, by using structurally differentiated support plates and cover plates in the model's internal connection area (such as the connection position between the first and second model areas), the main area (such as the middle area of ​​the second model area, and the middle area of ​​the second model), and the model's external connection area, respectively, the total weight of the train model can be reduced to a large extent. At the same time, the different degrees of weight reduction design and support function are coordinated to effectively improve the strength performance of the lightweight model to meet the requirements for the working stability of the train model during the "body dynamic, wind-static" test.

[0076] When the train is undergoing the "body moving and wind still" wind tunnel test, the linear motor and magnetic levitation and guidance technology drive the magnetic levitation platform on which the model is installed to move at high speed as a whole.

[0077] In some embodiments, the model is structurally designed using a symmetric design concept. After the first model for simulating the lead vehicle is designed, the first model for simulating the tail vehicle is designed by mirroring the front and rear symmetric surfaces of the vehicle body. After the front half of the middle vehicle model (i.e., the second model) is designed, the middle vehicle model is designed by mirroring the front and rear symmetric surfaces of the vehicle body.

[0078] In some embodiments, the carbon fiber foam sandwich skin is approximately 2.6 mm thick. It adopts a "sandwich" structure, with the thickness of the outer and inner carbon fiber layers being approximately 0.4mm and the thickness of the filling foam (PMI) sandwich layer being approximately 1.8mm.

[0079] Among them, the carbon fiber foam sandwich skin adopts the low-cost and high-efficiency VARI (vacuum resin introduction) molding process, the surface is paint-free, and the gel coat layer is laid to further improve the strength of the model. At the same time, the filling foam (PMI) sandwich structure, the weight-reducing support plate and the carbon tube bracket are matched to give full play to the characteristics of light weight and high strength of the composite material, which can not only achieve the shape preservation of the outer surface, but also withstand large loads, and can effectively reduce the weight of the model structure on the basis of meeting the rigid strength.

[0080] Among them, the support plate (also called the bulkhead) and the bracket constitute the main load-bearing frame of the model. When the train model is a lift wing train model, the load-bearing frame further includes a lift wing mounting seat fixing member, a lift wing mounting seat, a cover support member, and the like.

[0081] Preferably, the support plate, the lift wing mounting seat fixing member, the lift wing mounting seat, and the cover plate support member can all be made of 7075-T6 aluminum alloy.

[0082] In some embodiments, the support plate and the carbon tube support are fixed by using a bonding member (for example, two-component epoxy resin adhesive).

[0083] Specifically, a plurality of first connection holes are reserved at the edge of the support plate, and the carbon tubes can be connected to the plurality of support plates through the first connection holes and fixed by bonding members to form a stable load-bearing skeleton.

[0084] In some embodiments, a plurality of second connection holes may be further provided on the support plate. To fix corresponding parts (for example, bolts or screws).

[0085] For example, the lift wing mounting bracket is fixed to the support plate with M6 screws to provide a mounting base for the lift wing. M16 threaded holes are designed inside for model hoisting during testing.

[0086] In some embodiments, the model is designed using the embedded structure design concept, and metal structural parts are embedded under the carbon fiber foam sandwich skin through a gluing process to provide a foundation for parts installation. The embedded metal structural parts mainly include lift wing mounting seats and cover support parts. The outer surface of the embedded metal parts is the same as the inner surface of the carbon fiber foam sandwich skin, and the gluing width is generally in the range of 10mm-15mm.

[0087] In this embodiment, the designed support plate, lift wing mounting seat, lift wing mounting seat fixing member and other structural parts are applicable to different models, so they can be mass-produced. For example, a universal design method can be adopted, and the digital model and the connection interface are the same, which is convenient for mass production and reduces costs.

[0088] like Figure 5a , Figure 5bAs shown, in some embodiments, the force measuring balance 33 is the core component of the wind tunnel test. When designing the model, the upper and lower surfaces of the balance connector 32 are selected as the model design and installation reference. The two ends of the side of the balance connector 32 are positioned with the bulkhead through stoppers and fixedly connected with 6 M8 screws. The lower surface is positioned with the force measuring balance 33 through φ10 pins and fixedly connected with 12 M12 screws. During the design, it is required that the three force measuring modules 30 of the head car model, the middle car model and the tail car model coincide with the installation plane of the balance connector 32. The upper and lower surfaces of the balance connector 32 are used as the reference plane of the entire model, which is used for model angle measurement during the test. The processing accuracy is required to be less than 3′;

[0089] In order to enhance the internal rigidity of the curved surface of the head and tail models, a piece of filling foam is designed at a certain distance. The filling foam material is PMI (polyacrylimide) with a density of 60kg / m 3 -120kg / m 3 The filling foam is processed by CNC milling and fixed to the carbon tube by gluing, which effectively reduces the weight of the model;

[0090] In order to facilitate the installation and position adjustment of the force measuring balance 33, the model designs a cover plate. The cover plate adopts a shell design with a thickness of 3mm. The cover plate support 31 provides an installation base for the cover plate. The two are fixed by M4 screws, and the cover plate support 31 and the partition frame are fixed by M6 screws.

[0091] The entire design process takes into account the problems that arise in the processing, manufacturing and assembly processes in advance in the design through the design concepts of lightweight, modular, mass-produced, symmetrical and low-cost, reduces the coordination between parts and facilitates mass production and assembly. It can not only shorten the model design and processing cycle and effectively reduce the model weight, but also improve the model design quality and model status change efficiency, solve the lightweight design technology bottleneck problem faced by large-scale wind tunnel test models, and realize the lightweight structural design of high-speed train wind tunnel test models with strict requirements on size and weight. This design method is suitable for high-speed train test models with large size and weight in traditional wind tunnels, and can also be used for "body dynamic wind static" The dynamic model of the maglev flight wind tunnel is of great significance for studying and solving the inertia interference deduction of the dynamic model of the maglev flight wind tunnel force measurement test and improving the test accuracy.

[0092] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the sentence “Comprising a…” defined element does not exclude the existence of other identical elements in the process, method, article or device comprising the element.

[0093] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a computer terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0094] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A high-speed train wind tunnel test model, characterized in that: include: A first model (10), the first model (10) comprising: a first model area (11) and a second model area (12), a plurality of brackets (13) being arranged in the first model area and the second model area, the first model area and the second model area being respectively provided with at least one first support plate (14) and a second support plate (15) matched with the brackets, and a third support plate (16) being arranged at the connection between the first model area and the second model area; a first closing plate (17) for being opposite to an adjacent model is arranged at a first end of the second model area; at least one second model (20) disposed between the two first models, The second model comprises: a plurality of brackets, and at least one fourth support plate (21) arranged along the brackets; second sealing plates (22) are respectively arranged at both ends of the at least one second model, and the second sealing plates are used to connect with adjacent models; The first model and the second model both adopt a distributed weight-reducing and load-bearing design, wherein the third support plate (16) is provided with a semicircular first hollow area (161) and a second hollow area (162); the arcuate edges of the first hollow area (161) and the second hollow area (162) are arranged relative to each other, so that a triangular first support area (163) is reserved between at least one arcuate edge of the first and second hollow areas and the third support plate (16), and a quadrilateral second support area (164) is reserved between the straight-line edges of the first and second hollow areas and the edge of the third support plate; A third hollow area (151) in a quasi-circular shape is provided on the second support plate (15), and a third support area (152) is reserved between the edge of the third hollow area and the second support plate, and the width of the third support area (152) is smaller than the width of the first support area or the second support area.

2. A high-speed train wind tunnel test model according to claim 1, characterized in that: The fourth support plate (21) is provided with a fourth hollow area in a quasi-circular shape, and a fourth support area is reserved between the edge of the fourth hollow area and the fourth support plate, and the width of the fourth support area is smaller than the width of the first support area or the second support area.

3. A high-speed train wind tunnel test model according to claim 1, characterized in that: The first support plate is a filled foam plate, and the density of the filled foam plate is 60 kg / m 3 -120kg / m 3 .

4. A high-speed train wind tunnel test model according to claim 1, characterized in that: The outer sides of the first model and the second model are covered with skins, and the skins are carbon fiber foam sandwich skins.

5. A high-speed train wind tunnel test model according to claim 1, characterized in that: A force measuring module is provided in the center of gravity area of ​​at least one model, the force measuring module is provided between the two support plates, and the force measuring module comprises: a group of fifth support plates (23) passing through the bracket, the fifth support plates adopt a discrete hollow area design, wherein at least two quasi-circular fifth hollow areas (231) are provided in the upper area of ​​the fifth support plate, and an installation area is reserved between two adjacent fifth hollow areas, the installation area is used to install a balance connecting member (32), and the two ends of the balance connecting member (32) are fixedly installed in the installation areas on both sides through installation members; A sixth circular hollow area is further provided in the lower area of ​​the fifth support plate, and the area of ​​the sixth hollow area is larger than that of the fifth hollow area.

6. A high-speed train wind tunnel test model according to claim 1, characterized in that: One of the sealing plates is provided with a recessed area (221), and the other sealing plate corresponding to the sealing plate is provided with a raised area (222) corresponding to the recessed area; wherein, when the two models are connected, the two sealing plates cooperate to form a gas drainage channel (223).

7. A high-speed train wind tunnel test model according to claim 6, characterized in that: The gas drainage channel is sequentially formed with a first channel (223a), a first buffer channel (223b), a second channel (223c), a second buffer channel (223d) and a third channel (223e) along the gas flow direction; wherein, when the gas moves along the first channel (223a) to the first buffer channel at a first flow velocity, the gas is reduced from the first flow velocity to the second flow velocity under the action of the first buffer channel, and when the gas passes through the second channel and the second buffer channel in sequence, the gas is reduced from the second flow velocity to the third flow velocity again, and the angle between the first or second buffer channel and the vertical direction is 120°-145°.

8. A high-speed train wind tunnel test model according to claim 7, characterized in that: The width of the gas drainage channel is 5mm-10mm.

9. A high-speed train wind tunnel test model according to claim 8, characterized in that: The length of the first channel or the third channel is 1 / 4-1 / 3 of the length of the gas drainage channel.

10. A high-speed train wind tunnel test model according to claim 1, characterized in that: The support is a carbon tube.

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