Multifunctional noise aerodynamic test platform

Abstract

This invention discloses a multifunctional aerodynamic noise testing platform, comprising three sets of movable platform components, a platform component with a turntable, a folding platform component, a fixed platform component, a turntable platform component, a splicing platform component, a serrated platform component, and a load-bearing frame. All platform components are located on the upper plane of the load-bearing frame. Multiple sets of movable platform components and the turntable platform component are detachably connected sequentially between the front and rear edges of the multifunctional aerodynamic noise testing platform and between the two sets of fixed platform components. Behind the turntable platform component is the splicing platform component, and behind the splicing platform component is the serrated platform component. A wind tunnel test model is mounted on the turntable platform, allowing for changes in the sideslip angle of the wind tunnel test model. This invention can change the sideslip angle of the model and the position of the model's reference center along the wind tunnel axis, while simulating acoustic environments with and without reflections, meeting the needs of different types of aerodynamic noise wind tunnel tests.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wind tunnel test, and particularly relates to a multifunctional aerodynamic noise test platform. BACKGROUND

[0002] When an airplane, a high-speed train, a car and the like are in high-speed motion, they will interact with air to generate strong aerodynamic noise, which on one hand produces noise pollution to the outside world, and on the other hand is transmitted into the airplane or the vehicle to affect the comfort of passengers. At present, noise pollution prevention regulations and civil aircraft airworthiness clauses are increasingly strict on noise, and people's requirements for comfort are also increasingly high, so how to reduce aerodynamic noise has become an important content of the development of transportation tools.

[0003] Aerodynamic noise wind tunnel test is an important means for accurately evaluating the noise performance of an airplane, a high-speed train, a car and the like in the product development stage. When the aerodynamic noise wind tunnel test is performed, the test model needs to be supported in high-speed airflow to realize different test attitude changes and simulate the acoustic environment in actual operation, so as to ensure that the test data are accurate and reliable. In order to meet the needs of aerodynamic noise tests of an airplane large-size lift device model, a high-speed train, a car, a ship, a shipboard engine and the like, a multifunctional aerodynamic noise test platform is needed. SUMMARY

[0004] The purpose of the present application is to provide a multifunctional aerodynamic noise test platform for supporting a model in a wind tunnel and realizing changes of model attitude angles and changes of the position of a model reference center in the front and back directions of the axis of the wind tunnel, and simultaneously simulating acoustic environments with or without reflection to meet the needs of different types of aerodynamic noise wind tunnel tests.

[0005] The technical scheme adopted by the present application is: a multifunctional aerodynamic noise test platform, comprising a 0.5m movable platform assembly, a 1m movable platform assembly, a 1.5m movable platform assembly, a platform assembly with a rotating disc, four sets of folding platform assemblies, two sets of fixed platform assemblies, a rotating disc platform assembly, a spliced platform assembly, a sawtooth platform assembly, and a bearing frame, all the platform assemblies are located on the upper plane of the bearing frame, the bottom surfaces of the two sets of fixed platform assemblies, the spliced platform assembly, and the sawtooth platform assembly are fixedly connected with the bearing frame, the 0.5m movable platform assembly, the 1m movable platform assembly, the 1.5m movable platform assembly, and the platform assembly with a rotating disc are sequentially detachably connected between the front edge and the rear edge of the multifunctional aerodynamic noise test platform and between the two sets of fixed platform assemblies, the rear of the platform assembly with a rotating disc is provided with the spliced platform assembly, the rear of the spliced platform assembly is provided with the sawtooth platform assembly, the outer sides of the two sets of fixed platform assemblies and the spliced platform assembly are hingedly provided with the folding platform assemblies, the bottom of each set of folding platform assemblies is provided with a screw elevator, the folding of the folding platform assemblies is realized through the extension and retraction of the screw elevator, the rotating disc platform is rotationally connected to the upper plane of the platform with a rotating disc, a wind tunnel test model is installed on the rotating disc platform, the change of the side slip angle of the wind tunnel test model is realized through the rotation of the rotating disc platform, and the tail edge of the sawtooth platform assembly adopts a sawtooth structure.

[0006] Further, the 0.5m movable platform assembly, the 1m movable platform assembly, the 1.5m movable platform assembly, and the platform assembly with a rotating disc can interchange the front and rear positions, so as to realize the change of the reference center of the wind tunnel test model in the front and rear positions in the wind tunnel axis direction, to adapt to the needs of different wind tunnel test models.

[0007] Further, the cutting angle angles of the tail edges of the two sides of the sawtooth platform assembly are the same as the angle of the wind tunnel collector.

[0008] Further, all the platform assemblies are internally filled with sound-absorbing cotton, the outer surfaces are all wrapped with perforated plates, flexible fiber mats are pasted on the perforated plates, a plurality of solid wall surfaces are located on the flexible fiber mats, and the flexible fiber mats and the perforated plates are fixedly connected with the structural lining of the platform assemblies through screws.

[0009] Further, the plurality of solid wall surfaces are equal-size combined structures.

[0010] Further, the front edge of the multifunctional aerodynamic noise test platform is flush with the outlet of the wind tunnel contraction section, the rear edge extends into the wind tunnel collector, and a brush is used for sealing the gap.

[0011] Advantages and beneficial effects of the present invention: The present invention can realize the change of the model sideslip angle; and can realize the change of the model reference center position in the wind tunnel axis direction. At the same time, it can simulate the acoustic environment with and without reflection, and meet the needs of different types of aerodynamic noise wind tunnel tests. The present invention can be used for different types of noise wind tunnel tests such as aircraft lift enhancement devices, high-speed rail, automobiles, ships, and carrier-based aircraft. It can obtain aerodynamic noise data generated by the above test objects in high-speed airflow, and guide the low-noise design of the above test objects. It has the advantages of wide applicability and good test results, and its application prospects are very broad. Attached Figure Description

[0012] Figure 1 This is a top view schematic diagram of the multi-functional noise aerodynamic test platform;

[0013] Figure 2 for Figure 1 Left view;

[0014] Figure 3 for Figure 2 Enlarged view of point I. Detailed Implementation

[0015] The following specific embodiments, in conjunction with the accompanying drawings, further illustrate the technical solution of the present invention.

[0016] Example 1

[0017] like Figures 1 to 3As shown, a multifunctional aerodynamic noise test platform comprises a 0.5m movable platform assembly 1, a 1m movable platform assembly 2, a 1.5m movable platform assembly 3, a platform assembly with a turntable 4, four sets of folding platform assemblies 5, two sets of fixed platform assemblies 6, a turntable platform assembly 7, a spliced platform assembly 8, a sawtooth platform assembly 9, and a bearing frame 10. All the platform assemblies are located on the upper plane of the bearing frame 10. The bottom surfaces of the two sets of fixed platform assemblies 6, the spliced platform assembly 8, and the sawtooth platform assembly 9 are fixedly connected with the bearing frame 10. Between the two sets of fixed platform assemblies 6 from the front edge to the rear edge of the multifunctional aerodynamic noise test platform, the 0.5m movable platform assembly 1, the 1m movable platform assembly 2, the 1.5m movable platform assembly 3, and the platform assembly with a turntable 4 are sequentially detachably connected. The rear of the platform assembly with a turntable 4 is provided with the spliced platform assembly 8. The rear of the spliced platform assembly 8 is provided with the sawtooth platform assembly 9. The outer sides of the two sets of fixed platform assemblies 6 and the spliced platform assembly 8 are hingedly provided with the folding platform assemblies 5. The bottom of each set of folding platform assemblies 5 is provided with a screw elevator 11. The folding of the folding platform assemblies 5 is realized by the extension and retraction of the screw elevator 11, so as to reduce the occupied space during storage. The turntable platform 7 is rotationally connected to the upper plane of the platform with a turntable 4. A wind tunnel test model is installed on the turntable platform 7. The change of the side slip angle of the wind tunnel test model is realized by the rotation of the turntable platform 7. The tail edge of the sawtooth platform assembly 9 adopts a sawtooth structure, so as to reduce noise. The cutting angle of the tail edge of the sawtooth platform assembly 9 is the same as the angle of the wind tunnel collector.

[0018] The 0.5m movable platform assembly 1, the 1m movable platform assembly 2, the 1.5m movable platform assembly 3, and the platform assembly with a turntable 4 can be exchanged in position along the wind tunnel axis direction according to the needs of the test model, so as to realize the change of the reference center of the wind tunnel test model in the front and rear positions of the wind tunnel axis direction, and to adapt to the needs of different wind tunnel test models.

[0019] All the platform assemblies are frame structures welded by section steel, filled with sound-absorbing cotton 16 inside, wrapped with perforated plates 15 on six outer surfaces, and fixed with the perforated plates 15 on the frame of the platform assembly by screws. In addition to laying the perforated plates 15, the upper surface is also laid with flexible fiber felt 14 and solid wall surface 13. The flexible fiber felt 14 is adhered to the perforated plate 15 by high-strength structural adhesive. The solid wall surface 13 is fixed to the section steel frame by screws through the flexible fiber felt 14 and the perforated plate 15. The solid wall surface 13 is a combination structure of multiple blocks with the same size, which is convenient for disassembly and installation. Different types of noise wind tunnel tests are realized by disassembly or installation of the solid wall surface 13.

[0020] In the wind tunnel test, the front edge of the multifunctional noise aerodynamic test platform of the embodiment is flush with the outlet of the wind tunnel contraction section, the rear edge extends into the wind tunnel collector, a brush is used for sealing at the gap to prevent airflow disturbance from generating additional noise and affecting the test data.

Claims

1. A multifunctional pneumatic noise test platform, comprising a 0.5m movable platform assembly (1), a 1m movable platform assembly (2), a 1.5m movable platform assembly (3), a platform assembly with a turntable (4), four sets of folding platform assemblies (5), two sets of fixed platform assemblies (6), a turntable platform assembly (7), a spliced platform assembly (8), a sawtooth platform assembly (9), and a bearing frame (10), all platform assemblies are located on the upper plane of the bearing frame (10), the bottom surfaces of the two sets of fixed platform assemblies (6), the spliced platform assembly (8), and the sawtooth platform assembly (9) are fixedly connected with the bearing frame (10), characterized in that: The 0.5m movable platform assembly (1), the 1m movable platform assembly (2), the 1.5m movable platform assembly (3) and the platform assembly (4) with a rotating disc are detachably connected between the front edge and the rear edge of the multifunctional noise aerodynamic test platform and between the two groups of fixed platform assemblies (6) in sequence; the rear of the platform assembly (4) with a rotating disc is provided with a spliced platform assembly (8); the rear of the spliced platform assembly (8) is provided with a sawtooth platform assembly (9); the outer sides of the two groups of fixed platform assemblies (6) and the spliced platform assembly (8) are hingedly provided with folding platform assemblies (5); the bottom of each group of folding platform assemblies (5) is provided with a screw elevator (11); the folding of the folding platform assemblies (5) is realized through the extension and retraction of the screw elevators (11); the rotating disc platform assembly (7) is rotationally connected to the upper plane of the platform assembly (4) with a rotating disc; the wind tunnel test model is installed on the rotating disc platform assembly (7); the change of the side slip angle of the wind tunnel test model is realized through the rotation of the rotating disc platform assembly (7); the tail edge of the sawtooth platform assembly (9) adopts a sawtooth structure; the 0.5m movable platform assembly (1), the 1m movable platform assembly (2), the 1.5m movable platform assembly (3) and the platform assembly (4) with a rotating disc can be interchanged in front and back positions, so as to realize the change of the reference center of the wind tunnel test model in the front and back positions in the wind tunnel axis direction, to adapt to the needs of different wind tunnel test models; the cutting angle of the tail edge of the sawtooth platform assembly (9) on both sides is the same as the angle of the wind tunnel collector; all the platform assemblies are internally filled with sound-absorbing cotton (16), and the outer surfaces are all wrapped with perforated plates (15); the flexible fiber felt (14) is pasted on the perforated plates (15); a plurality of solid wall surfaces (13) are located on the flexible fiber felt (14) and are fixedly connected with the structure lining of the platform assembly by penetrating the flexible fiber felt (14) and the perforated plates (15) through screws; the plurality of solid wall surfaces (13) are equal-size combined structures; the front edge of the multifunctional noise aerodynamic test platform is flush with the outlet of the wind tunnel contraction section, and the rear edge extends into the wind tunnel collector; the gap is sealed by a brush.

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