A vibration reduction device for a swing blade gust generator

Abstract

The present invention provides a vibration reduction device for a swing blade gust generator, comprising a constant pressure valve, an exhaust pipe, an intake pipe, an intermediate air-filled soft plate, an upper partition, a lower partition, two groups of compression springs, a radial displacement gap is provided between the rotating shaft and the bearing of the swing blade, the upper partition and the lower partition are located between the radial displacement gap, an intermediate air-filled soft plate is installed between the upper partition and the lower partition, two groups of compression springs are also located between the upper partition and the lower partition and on both sides of the intermediate air-filled soft plate, the exhaust pipe and the intake pipe are connected to the intermediate air-filled soft plate, the constant pressure valve sets the pressure value according to the frequency and angle of the swing of the swing blade, and controls the air pressure in the intermediate air-filled soft plate. The present invention can suppress the clearance of the rotating shaft bearing of the gust generator according to the operating frequency and operating angle of the swing blade gust generator, effectively reduce the vibration amplitude of the swing blade gust generator when it is working, and improve the working efficiency of the swing blade gust generator.

Description

Technical Field

[0001] The invention belongs to the field of vibration reduction of gust generators, and in particular relates to a vibration reduction device for a gust generator with swing blades. Background Art

[0002] With the advancement of aviation technology, the demand for wind tunnel tests on gust loads and gust load mitigation of civil aircraft has become increasingly important. Gust tests in wind tunnels can provide important test parameters for the design of flight control rates of civil aircraft, test and verify gust load mitigation technology, and improve the safety and comfort of civil aircraft flying in gusty conditions.

[0003] The swing blade gust generator is the core equipment for wind tunnel gust simulation. It can simulate sinusoidal gusts and random gusts through the reciprocating swing of the swing blades in the wind tunnel. When the swing blade gust generator is in operation, it couples with the airflow and transmits vibration to the part with the largest gap in the gust generator structure, that is, the rotating shaft where the hydraulic swing cylinder of the swing blade gust generator and the swing blade are connected. Vibration will affect the working state of the gust generator, causing a large deviation between the actual working frequency of the gust generator and the set frequency, and it is also easy to cause the gust generator to resonate, affecting the safe use of the equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a vibration reduction device for a gust generator with a swing blade, which is used to achieve vibration reduction when the swing blade gust generator is running in a wind tunnel, reduce the vibration amplitude of the swing blade gust generator when it is working, and improve the working efficiency of the swing blade gust generator.

[0005] The technical solution of the present invention is: a vibration reduction device for a swing blade gust generator, including a constant pressure valve, an exhaust pipe, an intake pipe, an intermediate air-filled soft plate, an upper baffle, a lower baffle, and two groups of compression springs. A radial displacement gap is provided between the rotating shaft of the swing blade and the bearing. The upper baffle and the lower baffle are located between the radial displacement gap. An intermediate air-filled soft plate is installed between the upper baffle and the lower baffle. The two groups of compression springs are also located between the upper baffle and the lower baffle and on both sides of the intermediate air-filled soft plate. The exhaust pipe and the intake pipe are connected to the intermediate air-filled soft plate. The constant pressure valve sets the pressure value according to the frequency and angle conditions of the swing of the swing blade to control the air pressure in the intermediate air-filled soft plate.

[0006] The present invention also has the following technical features:

[0007] 1. The exhaust pipe and the intake pipe are connected to the middle air-filled soft plate by sequentially passing through the bearing seat, the outer sleeve, the upper partition plate and the middle air-filled soft plate of the swing blade shaft.

[0008] 2. A constant pressure valve is installed on the air intake pipe.

[0009] 3. When the swing blade is in a low-frequency and small-angle swing state, the middle air-filled soft plate is inflated, and the expanded middle air-filled soft plate suppresses the vibration amplitude of the gust generator at the radial gap between the rotating shaft and the bearing; when the swing blade is in a high-frequency and large-angle swing state, the middle air-filled soft plate, the two lower partitions and the micro compression spring work together to suppress the vibration amplitude of the gust generator at the radial gap between the rotating shaft and the bearing. The constant pressure valve sets the pressure value according to the frequency and angle conditions of the swing blade, controls the air pressure in the middle air-filled soft plate, controls the elastic damping effect, and matches the elastic damping with the swing condition of the swing blade.

[0010] The beneficial effects and advantages of the present invention are as follows: the present invention can suppress the clearance of the gust generator shaft bearing according to the operating frequency and operating angle of the swing blade gust generator. It is simple to implement, quick to apply, and convenient to maintain. It can effectively reduce the vibration amplitude of the swing blade gust generator when it is working, and improve the working efficiency of the swing blade gust generator. Its application prospect is very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a front view of a swing blade gust generator;

[0012] Figure 2 is a side view of a swing blade gust generator;

[0013] Figure 3 The schematic diagram of the vibration reduction device for the swing blade gust generator;

[0014] Figure 4 for Figure 3 A larger picture of local I.

[0015] Among them, 1. wind tunnel body, 2. hydraulic swing cylinder, 3. hydraulic swing cylinder axial fixing seat, 4. vertical support, 5. top support seat, 6. bottom support seat, 7. swing blades, 8. vertical support splint, 9. bottom support of hydraulic swing cylinder, 10. constant pressure valve, 11. exhaust pipe, 12. mini quick connect plug, 13. bearing seat insertion tube, 14. middle inflatable soft plate, 15. upper partition, 16. lower partition, 17. compression spring. DETAILED DESCRIPTION

[0016] The following specific implementation examples are listed in conjunction with the drawings in the specification to further illustrate the technical solution of the present invention.

[0017] like Figure 1-2As shown, the hydraulic swing cylinder 2 is connected to the wind tunnel body 1 through the hydraulic swing cylinder axial fixing seat 3 and the hydraulic swing cylinder bottom support 9. When the hydraulic swing cylinder 2 is working, it drives the swing blade 7 to swing back and forth. The swing blade 7 is intermediately supported by the vertical support 4. The vertical support 4 is connected to the wind tunnel body 1 through the top support seat 5 and the bottom support seat 6. The vertical support splint 8 realizes the lateral positioning of the vertical support 4 in the wind tunnel body 1.

[0018] like Figure 3-4 As shown, a vibration reduction device for a swing blade gust generator includes a constant pressure valve 10, an exhaust pipe 11, an intake pipe 13, an intermediate air-filled soft plate 14, an upper partition 15, a lower partition 16, and two groups of compression springs 18. A radial displacement gap 17 is provided between the rotating shaft and the bearing of the swing blade. The upper partition 15 and the lower partition 16 are located between the radial displacement gap 17. The intermediate air-filled soft plate 14 is installed between the upper partition 15 and the lower partition 16. The two groups of compression springs 17 are also located between the upper partition 15 and the lower partition 16 and on both sides of the intermediate air-filled soft plate 14. The exhaust pipe 11 and the intake pipe 13 are connected to the intermediate air-filled soft plate 14 through the bearing seat, the outer sleeve, the upper partition of the swing blade rotating shaft in sequence. A constant pressure valve is installed on the intake pipe, and the constant pressure valve is connected to an external air source through a micro quick-connect plug. The compression spring is a micro compression spring. The exhaust pipe 11 and the intake pipe 13 are respectively in two groups.

[0019] Before the swing blade 7 works, the middle air-filled soft plate 14 is pressurized by air injection, and the pressure is stabilized by the constant pressure valve 10;

[0020] When the swing blade is in a low-frequency and small-angle swing state, the vibration of the gust generator is mainly caused by the large radial gap between the rotating shaft and the bearing. Air is introduced from the outside through the air intake pipe 13 to expand the middle air-filled soft plate 14, thereby increasing the distance between the upper partition 15 and the lower partition 16, reducing the large radial gap between the rotating shaft and the bearing, and reducing the vibration amplitude; when the swing blade is in a high-frequency and large-angle swing state, the vibration of the gust generator is mainly caused by the small radial gap between the rotating shaft and the bearing, and the reciprocating impact and collision of the rotating shaft on the bearing causes vibration. Air is introduced from the outside through the air intake pipe 13 to make the pressure in the middle air-filled soft plate 14 relatively large. The upper partition 15, the compression spring 17, the middle air-filled soft plate 14 and the lower partition 16 form elastic damping against the impact of the rotating shaft, suppressing the direct impact of the rotating shaft on the bearing and reducing the vibration amplitude. The constant pressure valve 10 sets the pressure value according to the frequency and angle of the swinging blade, controls the air pressure in the middle air-filled soft plate 14, controls the elastic damping effect, matches the elastic damping with the blade swinging condition, reasonably controls the vibration amplitude, and realizes effective vibration reduction.

Claims

1. A vibration reduction method for a swing blade gust generator, characterized in that: The method is as follows: the equipment used includes a constant pressure valve (10), an exhaust pipe (11), an intake pipe (13), an intermediate air-filled soft plate (14), an upper baffle (15), a lower baffle (16), and two groups of compression springs (18); a radial displacement gap (17) is provided between the rotating shaft of the swing blade and the bearing; the upper baffle (15) and the lower baffle (16) are located between the radial displacement gap (17); an intermediate air-filled soft plate (14) is installed between the upper baffle (15) and the lower baffle (16); the two groups of compression springs (18) are also located between the upper baffle (15) and the lower baffle (16) and on both sides of the intermediate air-filled soft plate (14); the exhaust pipe (11) and the intake pipe (13) are connected to the intermediate air-filled soft plate (14); the constant pressure valve (10) sets a pressure value according to the frequency and angle of the swing of the swing blade, and controls the intermediate air-filled soft plate (14) to move upward and downward. 4) air pressure inside; the exhaust pipe (11) and the intake pipe (13) pass through the bearing seat, the outer sleeve, the upper partition and the middle air-filled soft plate (14) of the swing blade shaft in sequence; the intake pipe is installed with a constant pressure valve (10); when the swing blade is in a low frequency and small angle swing state, the middle air-filled soft plate is replenished with air, and the expanded middle air-filled soft plate suppresses the vibration amplitude of the gust generator at the radial gap between the shaft and the bearing; when the swing blade is in a high frequency and large angle swing state, the middle air-filled soft plate, the two lower partitions and the micro compression spring work together to suppress the vibration amplitude of the gust generator at the radial gap between the shaft and the bearing, and the constant pressure valve sets the pressure value according to the frequency and angle conditions of the swing blade swing, controls the air pressure in the middle air-filled soft plate, controls the elastic damping effect, and matches the swing condition of the swing blade.

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