A slender body structure support and drag reduction device under follow-up thrust

Abstract

The present invention discloses a device for supporting and reducing drag on a slender structure under follower thrust. The device comprises a support frame mechanism secured to a base plate, a glass plate secured above the support frame mechanism, and a clamping universal ball mechanism mounted below the slender structure and solid rocket motor. The device, disclosed herein for ground testing of slender structures under follower thrust, effectively supports the slender structure and solid rocket motor, and effectively reduces frictional resistance between the slender structure and the solid rocket motor and the support frame during their swing.

Description

Technical Field

[0001] The invention belongs to the technical field of solid rocket engine ground testing, and relates to support and drag reduction during ground testing of a slender body structure under the action of follower thrust. Background Art

[0002] With the development of new-generation missiles featuring ultra-high speeds, high angles of attack, high maneuverability, high slenderness ratios, and lightweight technologies, the structural characteristics of missile bodies have undergone significant changes. For high-thrust missiles, as axial overload increases, the missile body structure becomes increasingly flexible, making it more susceptible to elastic deformation after being disturbed. During vibration, the bending deformation at both ends of a slender missile body is relatively large. Since the thrust vector of a solid rocket motor is always tangential to the tail end of the missile body, its direction also fluctuates with the lateral bending vibration of the missile body. The lateral component of the thrust, generated in a direction orthogonal to the missile body's axis, excites the missile body into periodic lateral vibrations, which in turn creates stability issues. Therefore, research on the influence of engine thrust on missile structural vibration and missile body stability is of great significance. This force, whose direction changes with structural vibration, is called servo thrust.

[0003] In the ground test research of slender body structures under the action of follower thrust, it is necessary to design a support structure to ensure that the slender body structure is in a horizontal state. This can improve the ground test quality of solid rocket engines, expand the test conditions, promote the progress of my country's aerospace science and technology, and accelerate the development of test technology. Summary of the Invention

[0004] The purpose of the present invention is to complete the supporting test equipment used in ground tests and provide a support and friction reduction device for ground tests of slender body structures and solid rocket engines under the action of follower thrust. The device can effectively support the slender body structure and solid rocket engine according to the test requirements and reduce the friction resistance during the swinging process.

[0005] In order to solve the above technical problems, the present invention discloses a slender body structure support and friction reduction device under the action of follower thrust, comprising: a support frame mechanism, a glass plate fixed above the support frame mechanism, and a clamp universal ball mechanism arranged above the glass plate;

[0006] The support frame mechanism includes: a base plate, a plurality of support plates arranged vertically on the base plate, and a mounting plate mounted horizontally on the support plates;

[0007] The glass plate is positioned in the groove of the mounting plate;

[0008] The clamp universal ball mechanism includes: an embracing clamp clamped on the slender body structure, a fixing nut fixed on the bottom of the embracing clamp, and a universal ball bearing installed below the fixing nut, and the universal ball bearing is supported on the glass plate.

[0009] Furthermore, the base plate is provided with a mounting hole, which is installed on the test bench, and a positioning key is provided at the bottom to cooperate with the T-slot on the test bench.

[0010] Furthermore, the support plate is made of channel steel, and the support plate is welded to the base plate and the mounting plate.

[0011] Furthermore, the number of the support plates is 5.

[0012] Furthermore, the support plates are installed on the base plate in sequence according to a set interval distance.

[0013] Furthermore, the mounting plate is designed as a positioning groove structure.

[0014] Furthermore, the glass plate is made of tempered glass with a thickness of not less than 10 mm.

[0015] Furthermore, the embracing clamp includes two semicircular ring structures, which are symmetrical structures. After being assembled with the engine, the gap between the upper and lower semicircular rings is 8 mm.

[0016] Furthermore, the fixing nut is welded to the bottom of the embracing clamp.

[0017] Furthermore, the universal ball bearing is screwed and mounted on the fixing nut.

[0018] The advantages of the present invention compared with the prior art are:

[0019] The device for supporting and reducing drag of a slender structure under follower thrust provided by the present invention is used during ground testing of slender structures under follower thrust and solid rocket engines. On the one hand, by providing a support frame mechanism on the base plate, a glass plate can be securely mounted on the support frame, thereby facilitating optimal support. Secondly, by providing a mounting nut and a universal ball bearing component below the encircling clamp mechanism, the universal ball bearing makes point contact with the glass plate, achieving optimal friction reduction. Thirdly, the threaded connection between the universal ball bearing and the fixing nut allows for easy replacement of the universal ball bearing if damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main structure of the slender body structure support and drag reduction device under the action of follower thrust provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the slender body structure support and friction reduction device under the action of follower thrust provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the support frame mechanism provided by the present invention;

[0023] Figure 4 is a schematic diagram of the three-dimensional structure of the glass plate provided by the present invention;

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the universal ball with a clamp provided by the present invention;

[0025] Figure 6 It is a schematic diagram of an installation example provided by the invention;

[0026] Figure 7 It is an enlarged view of the installation example provided by the invention. DETAILED DESCRIPTION

[0027] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] like Figures 1 and 2 The device shown is used for supporting and reducing friction of a slender structure (a slender structure generally refers to a structure with a diameter-to-length ratio greater than 6) under the action of a follower thrust, including a support frame mechanism 1 fixed by a base plate 1-1, a glass plate 2 fixed above the support frame mechanism, and a clamp universal ball mechanism 3 installed below the slender structure and above the glass plate 2.

[0029] like Figure 3 As shown, the support frame mechanism 1 includes: a base plate 1-1 installed on the test bench, a certain number of support plates 1-2 arranged vertically on the base plate 1-1, and a mounting plate 1-3 horizontally installed on the support plate 1-2, and the surface of the mounting plate 1-3 is designed as a positioning groove structure.

[0030] like Figure 4 As shown, the glass plate 2 is installed in the positioning groove of the mounting plate 1-3 in the support frame mechanism 1.

[0031] like Figure 5 As shown, the clamp universal ball mechanism 3 includes: an embracing clamp 3-1 fixed on the slender body structure, a fixing nut 3-2 welded and fixed to the bottom of the embracing clamp 3-1, and a universal ball bearing 3-3 tightened and installed in the fixing nut 3-2.

[0032] The base plate 1 - 1 is provided with a mounting hole and is mounted on the test bench. A positioning key is provided at the bottom to cooperate with the T-slot on the test bench.

[0033] The support plate 1-2 is made of channel steel, and the support plate 1-2 is welded to the base plate 1-1 and the mounting plate 1-3.

[0034] The number of the support plates 1-2 is 5.

[0035] The support plates 1 - 2 are sequentially installed on the base plate 1 - 1 according to a set spacing distance.

[0036] The mounting plates 1-3 are designed as positioning groove structures.

[0037] The glass plate 2 is made of tempered glass with a thickness of not less than 10 mm.

[0038] The embracing clamp 3-1 comprises two semicircular ring structures, which are symmetrical structures. After being assembled with the engine, the gap between the connecting ears on the sides of the upper and lower semicircular rings is designed to be 8 mm.

[0039] The fixing nut 3-2 is welded to the bottom of the embracing clamp 3-1.

[0040] The universal ball bearing 3-3 is screwed and mounted on the fixing nut 3-2.

[0041] like Figure 6 、 Figure 7 As shown, the device of the present invention is installed together with the slender rod and the solid rocket engine to support the engine. During the swinging operation of the slender rod and the solid rocket engine, it provides minimum friction resistance and reduces the impact on the slender rod and the solid rocket engine.

[0042] The device for supporting and reducing friction of a slender body structure under the action of follower thrust provided by the embodiment of the present application is applied in the ground test process of the slender body structure under the action of follower thrust of a solid rocket engine. On the one hand, by arranging a support frame mechanism 1 on the base plate 1-1, the glass plate 2 can be firmly mounted on the support frame, so as to obtain the optimal support effect; on the second hand, the present invention arranges a mounting nut 3-2 and a universal ball bearing 3-3 component below the embracing clamp mechanism 3-1, so that the universal ball bearing 3-3 is in point contact with the glass plate 2, thereby having the optimal friction reduction effect; on the third hand, the present invention can facilitate the replacement of the universal ball bearing when it is damaged by the threaded connection between the universal ball bearing 3-3 and the fixing nut 3-2.

[0043] It should be noted that the above description is only a preferred embodiment of the present invention. It should be understood that those skilled in the art can make several changes and improvements without departing from the technical concept of the present invention, which are all included in the scope of protection of the present invention.

[0044] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A device for supporting and reducing drag of a slender structure under follower thrust, used in ground tests of slender structures under follower thrust of solid rocket engines, characterized in that: include: A support frame mechanism (1), a glass plate (2) fixed above the support frame mechanism (1), and a clamp universal ball mechanism (3) arranged above the glass plate (2); The support frame mechanism (1) comprises: a base plate (1-1), a plurality of support plates (1-2) arranged vertically on the base plate, and a mounting plate (1-3) mounted horizontally on the support plates (1-2); The glass plate (2) is positioned in a groove of the mounting plate (1-3); The clamp universal ball mechanism (3) comprises: an embracing clamp (3-1) clamped on the slender body structure, a fixing nut (3-2) fixed to the bottom of the embracing clamp (3-1), and a universal ball bearing (3-3) installed below the fixing nut (3-2), wherein the universal ball bearing (3-3) is supported on the glass plate (2); The glass plate (2) is made of tempered glass with a thickness of not less than 10 mm; The embracing clamp (3-1) comprises two semicircular ring structures, which are symmetrical structures; The fixing nut (3-2) is welded to the bottom of the embracing clamp (3-1); The universal ball bearing (3-3) is screwed and mounted on the fixing nut (3-2).

2. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: The bottom plate (1-1) is provided with a mounting hole and is mounted on the test bench. A positioning key is provided at the bottom to cooperate with the T-slot on the test bench.

3. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: The support plate (1-2) is made of channel steel, and the support plate (1-2) is welded to the bottom plate (1-1) and the mounting plate (1-3).

4. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: The number of the support plates (1-2) is 5.

5. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: The support plates (1-2) are sequentially mounted on the base plate (1-1) according to a set spacing distance.

6. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: The mounting plate (1-3) is designed as a positioning groove structure.

7. The slender body structure support and drag reduction device under follower thrust according to claim 1, characterized in that: After the embracing clamp (3-1) is assembled with the engine, the gap between the upper and lower semicircular rings is 8 mm.

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