Wind tunnel multi-body multi-degree-of-freedom separation simulation test system

Abstract

The invention discloses a wind tunnel multi-body multi-degree-of-freedom separation simulation test system which comprises an attack angle mechanism, a radial radiation type support, a right-angle supporting rod, a yaw assembly, a linear electric cylinder, a pitching assembly, a rolling assembly, a sublevel external store and a main level model, and the attack angle mechanism installed on a wind tunnel test section achieves attitudes such as the attack angle, the rolling angle and the yaw angle of the main level model. The radial radiation type support, the right-angle supporting rod, the yaw assembly, the linear electric cylinder, the pitching assembly, the rolling assembly and the sublevel external store form a series connection type six-degree-of-freedom movement device, and each sublevel external store can manually or automatically achieve six-degree-of-freedom control relative to the main-level model. The plurality of sublevel external store and the driving system are arranged along the circumferential direction as required relative to the main-level model, each driving device is controlled to move, the multi-degree-of-freedom position and attitude change of the plurality of sublevel external store is realized in a wind tunnel test section, and the simulation of the motion trail of the sublevel external store and the load measurement of the pneumatic relative interference under the multi-body and multi-attitude condition are realized.

Description

Technical Field

[0001] The invention belongs to the field of wind tunnel experimental aerodynamics, and in particular relates to a wind tunnel multi-body multi-degree-of-freedom separation simulation test system. Background Art

[0002] During the flight phases such as the separation of multiple boosters between rocket stages, the launch and release of multiple external attachments on aircraft, and separation, the separation body and the parent body are in a complex and mutually interfering flow field. Shock wave interference and dangerous separation characteristics can easily lead to collision and destruction between multiple bodies, endangering the safety of the host. It is very necessary to conduct trajectory capture wind tunnel tests to understand the process and dynamic characteristics of multi-body multi-degree-of-freedom release or separation through ground wind tunnel simulation tests.

[0003] With the increasing demand for aircraft applications, the test simulation needs to achieve simultaneous separation simulation of more than two separations. The existing CTS test technology used in China can only achieve the test simulation of one separation body, and the other separation body can only be fixed in position during the test. The test results deviate greatly from the actual situation, making it difficult to meet the test needs. Summary of the invention

[0004] The object of the present invention is to provide a wind tunnel multi-body multi-degree-of-freedom separation simulation test system, through a series of orthogonal six-degree-of-freedom motion devices, a sub-stage external attachment and a main-stage model form a relative coordinate system, the motion solution equation is simplified, a plurality of sub-stage external attachments and a drive system are arranged circumferentially relative to the main-stage model as required, the movement of each drive device is controlled, and the multi-degree-of-freedom position and posture changes of the plurality of sub-stage external attachments are realized in the wind tunnel test section, the simulation of the motion trajectory of the sub-stage external attachment and the load measurement of the aerodynamic relative interference under multi-body and multi-posture conditions are realized.

[0005] The above-mentioned purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A wind tunnel multi-body multi-degree-of-freedom separation simulation test device comprises an angle of attack mechanism, a radial radiation bracket, a right-angle support rod, a yaw assembly, a linear electric cylinder, a pitch assembly, a roll assembly, a sub-stage external attachment and a main-stage model. The radial radiation bracket of the angle of attack mechanism is arranged on the main-stage model. A driving device is arranged at the end of the support rod of the radial radiation bracket. One end of the right-angle support rod is connected to the driving device at the end of the radial radiation bracket, and the other end is connected to the yaw assembly. The yaw assembly realizes yaw motion relative to the right-angle support rod. The linear electric cylinder is connected to the yaw assembly to form a sliding pair. The pitch assembly is installed at the end of the linear electric cylinder. The linear electric cylinder is used to realize radial movement. The pitch assembly realizes rotation. The input end of the roll assembly is connected to the pitch assembly, and the output end is connected to the sub-stage external attachment. The sub-stage external attachment is arranged on the circumference of the main-stage model. The roll assembly drives the sub-stage external attachment to realize rolling motion.

[0007] The OXYZ coordinate system is established with the main model axial direction as the X axis and the center of the main model as the origin O. The radial radiation bracket is connected to the input end of the right-angle support rod to realize the movement of the right-angle support rod in the X direction. r The centerline of the shaft hole at the input end of the yaw assembly is orthogonal to the centerline of the shaft hole at the output end, and the yaw assembly realizes Z relative to the right-angle support rod. r Move to, and ψ r The output end of the yaw assembly is connected to the linear electric cylinder to realize Y r The end of the motion and linear electric cylinder is connected to the pitch assembly, which drives the roll assembly to achieve θ r Movement, the output end of the rolling component drives the sub-stage external objects to achieve γ r Roll motion and Z movement.

[0008] The number of sub-level attachments is 2-6.

[0009] A lead screw linear motion mechanism is installed in the center line cylinder of the angle attack mechanism to realize the axial movement of the main stage model. The rear end and front end of the center circle seat of the radial radiation type bracket are respectively connected to the angle attack mechanism and the main stage model through cone fit.

[0010] The rolling assembly is a T-shaped right-angle structure. The rolling assembly uses a servo motor to drive a harmonic reducer to drive the sub-stage external attachment to achieve rolling motion.

[0011] A supporting strut is provided to install the sub-stage external attachments, wherein the front end of the supporting strut is a rod-shaped structure with a length-to-diameter ratio of 15-25, and the rear end is a variable-section rod-shaped structure.

[0012] The rear end of the support rod is preset with an offset angle or a vertical support arm.

[0013] An on-off detection circuit is set between the sub-level external attachment and the main-level model to realize collision detection.

[0014] A wind tunnel multi-body multi-degree-of-freedom separation simulation test system comprises a wind tunnel multi-body multi-degree-of-freedom separation simulation test device and a test section, wherein an angle of attack mechanism is arranged in the test section, a sub-stage external attachment is located in an observation window of the test section, the sub-stage external attachment is driven by its own driving device, an initial position and a motion position of the sub-stage external attachment are inspected and calibrated, and simulation of the motion trajectory of the sub-stage external attachment and load measurement under multi-body and multi-posture conditions are realized.

[0015] When the test section is an open test section, the driving device shall be placed outside the airflow area of ​​the test section.

[0016] When the test section is rectangular and the number of sub-stage external attachments is 2 or 4, the radial radiation type brackets are arranged along the diagonal lines of the rectangular cross section of the test section.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention adopts a serial orthogonal six-degree-of-freedom motion device, and the radial radiation bracket is synchronized with the attitude angle of the main-stage model on the angle-of-attack mechanism, so that the sub-stage external attachment forms a relative coordinate system with the main-stage model, simplifying the motion solution equation. Each sub-stage external attachment can manually or automatically realize the six degrees of freedom control relative to the main-stage model. Multiple sub-stage external attachments and drive systems are arranged circumferentially relative to the main-stage model as required, and the movement of each drive device is controlled to realize the multi-degree-of-freedom position and attitude changes of multiple sub-stage external attachments in the wind tunnel test section, realize the simulation of the motion trajectory of the sub-stage external attachment and the load measurement of the aerodynamic relative interference under multiple bodies and multiple attitudes.

[0019] (2) The angle-of-attack mechanism of the present invention can realize the movement of the main-stage model along its axial direction, expand the relative movement distance between the sub-stage external attachment and the main-stage model, and realize the maximum observation range of the optical observation window of the sub-stage external attachment in the test section.

[0020] (3) In the present invention, collision detection and recognition circuits are provided between each sub-level external attachment and the main-level external attachment to recognize mutual position interference information. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the wind tunnel multi-body multi-degree-of-freedom separation simulation test system of the present invention;

[0022] Figure 2 It is a side view schematic diagram of the wind tunnel multi-body multi-degree-of-freedom separation simulation test system of the present invention;

[0023] Figure 3 It is a front view schematic diagram of the wind tunnel multi-body multi-degree-of-freedom separation simulation test system of the present invention;

[0024] Figure 4 This is a schematic diagram of the six-degree-of-freedom drive system of the sub-stage external attachment of the present invention;

[0025] Figure 5 This is a schematic diagram of the sub-stage external attachment support rod of the present invention;

[0026] Figure 6 It is a schematic diagram of the external front chamber of the open-type test section driving system of the present invention;

[0027] Figure 7 This is a schematic diagram of the open-type test section driving system using support in the present invention;

[0028] Figure 8 It is an external axonometric schematic diagram of the open test section drive system of the wind tunnel multi-body multi-degree-of-freedom separation simulation test system of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] like Figure 1-3 As shown, the angle of attack mechanism 1 installed in the wind tunnel test section realizes the main-stage model 9's angle of attack, roll angle, yaw angle and other postures. The radial radiation bracket 2, the right-angle support rod 3, the yaw assembly 4, the linear electric cylinder 5, the pitch assembly 6, the roll assembly 7, and the sub-stage external attachment 8 form a set of serial orthogonal six-degree-of-freedom motion devices. Each sub-stage external attachment 8 can manually or automatically realize the control of the six degrees of freedom relative to the main-stage model 9, and the control of each degree of freedom can realize forward and reverse control according to the initial position. Multiple sub-stage external attachments and matching six-degree-of-freedom motion devices are arranged circumferentially relative to the main-stage model according to the actual required number and initial position, and the movement of each driving device is controlled to realize the multi-degree-of-freedom position and posture changes of multiple sub-stage external attachments in the wind tunnel test section, and the simulation of the motion trajectory of the sub-stage external attachments and the load measurement of the aerodynamic relative interference under multi-body and multi-posture conditions are realized.

[0031] The angle of attack mechanism 1 can realize the movement of the main-stage model 9 along its axial direction, expand the relative movement distance between the sub-stage external attachment 8 and the main-stage model 9, and realize the observation range of the sub-stage external attachment 8 in the optical observation window of the test section 10 to the maximum extent.

[0032] like Figure 4 As shown, the radial radiation bracket 2 is synchronized with the attitude angle of the main stage model 9 on the angle of attack mechanism 1, so that the sub-stage external objects 8 and the main stage model 9 form a relative coordinate system, simplifying the motion solution equation. It forms a radial bracket according to the number and position requirements of the sub-stage external objects 8, such as an X-shaped, a cross-shaped, etc.

[0033] The windward surface of the radial radiation type bracket 2 is set as a conical surface to reduce the shock wave resistance. A driving device is provided at the end of each support rod of the radial radiation type bracket 2 to drive the right-angle support rod 3 to move along the X direction. When the sub-span super wind tunnel test section is rectangular and the number of sub-stage external attachments 8 is 2 or 4, the radial radiation type bracket 2 is arranged along the diagonal of the rectangle, which can increase the movement distance in the Y direction and the Z direction.

[0034] One end of the right-angle support rod 3 is connected to the X-direction driving device of the radial radiation type bracket 2, and the other end is connected to the yaw assembly 4. The yaw assembly 4 realizes Y-direction movement and Y-direction rotation, i.e., yaw motion, relative to the right-angle support rod 3.

[0035] The linear electric cylinder 5 forms a sliding pair with the yaw assembly 4 to achieve Z-direction movement, and a pitch assembly 6 is installed at the end, and the pitch assembly 6 is driven by a torque motor to achieve Z-direction rotation.

[0036] The rolling assembly 7 is a T-shaped right-angle structure, and the rolling assembly 7 uses a servo motor to drive a harmonic reducer to drive the sub-stage external attachment 8 to achieve rolling motion.

[0037] The sub-stage external attachment 8 is located in the observation window of the test section 10, and the quantitative density measurement of the shock wave interference is achieved by focusing the schlieren.

[0038] like Figure 5 As shown, when the sub-stage external attachment 8 is embedded or the tail is set back, it is relatively small relative to the main stage model 9, and slender support struts with different transfer angles can be set to install the sub-stage external attachment 8. The front end of the strut is a structure with a large slenderness ratio L / D of 15-25 to meet the support requirements of the built-in slender body model, and to ensure that the tail of the model reserves a medium straight section length of the test standard, and the rear end is designed as a variable cross-section equal stiffness beam. Figure 5 b is an example of setting the offset A to be less than 15°, ensuring that the head of the sub-stage external storage 8 can enter the interior of the buried or rear-retracted main stage model 9. Figure 5 c is a design example when the offset distance Loff is large, and its vertical arm adopts a V-shaped structure to guide the flow. Figure 5 b Figure 5 c Because of the pre-biased angle and distance, the sub-stage external storage object 8 can move in the positive and negative directions according to the aerodynamic load, avoiding Figure 5 a. The defect that the rear end support rod can only move in the direction away from the original position due to the large cross-section of the rear end support rod.

[0039] like Figure 6 As shown, when the test section 10 is an open test section, in order to reduce the blockage effect of a set of serial orthogonal six-degree-of-freedom motion devices composed of radial radiation type bracket 2, right-angle support rod 3, yaw assembly 4, linear electric cylinder 5, pitch assembly 6, roll assembly 7, and sub-stage external attachment 8, the serial orthogonal six-degree-of-freedom motion device can be placed outside the airflow area of ​​the test section.

[0040] like Figure 7 and Figure 8 As shown, when the test section 10 is an open test section, in order to reduce the influence of the blocking degree of the drive device, most of the components of the drive device can be placed outside the airflow area of ​​the test section. When the angle of attack mechanism 1 is supported by the abdomen alone, it supports the main-stage model 9, and the corresponding six-degree-of-freedom drive system of the sub-stage external attachment 8 is relatively independent from the main-stage model 9. At this time, the cave coordinate system is used for solution.

[0041] An on-off detection circuit is set between the sub-level external attachment 8 and the main-level model 9 to realize collision detection, and the collision component information is identified by corresponding the collision circuit to each component number.

[0042] The above description is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

[0043] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A wind tunnel multi-body multi-degree-of-freedom separation simulation test device, characterized in that: The invention comprises an angle of attack mechanism (1), a radial radiation bracket (2), a right-angle support rod (3), a yaw assembly (4), a linear electric cylinder (5), a pitch assembly (6), a roll assembly (7), a sub-stage external attachment (8) and a main-stage model (9). The radial radiation bracket (2) of the angle of attack mechanism (1) is arranged on the main-stage model (9). A driving device is arranged at the end of the support rod of the radial radiation bracket (2). One end of the right-angle support rod (3) is connected to the driving device at the end of the radial radiation bracket (2), and the other end is connected to the yaw assembly (4). The component (4) realizes yaw motion relative to the right-angle support rod (3); the linear electric cylinder (5) is connected to the yaw component (4) to form a sliding pair; the end of the linear electric cylinder (5) is installed with a pitch component (6); the linear electric cylinder (5) is used to realize radial movement; the pitch component (6) realizes rotation; the input end of the roll component (7) is connected to the pitch component (6); the output end is connected to the sub-stage external attachment (8); the sub-stage external attachment (8) is arranged on the circumference of the main-stage model (9); and the roll component (7) drives the sub-stage external attachment (8) to realize roll motion.

2. A wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: The axial direction of the main model (9) is taken as the X axis and the center of the main model (9) is taken as the origin O to establish an OXYZ coordinate system. The radial radiation bracket (2) is connected to the input end of the right-angle support rod (3) to realize the movement of the right-angle support rod (3) in the X direction. r The center line of the shaft hole at the input end of the yaw assembly (4) is orthogonal to the center line of the shaft hole at the output end, and the yaw assembly (4) realizes Z relative to the right-angle support rod (3). r Move to, and ψ r The output end of the yaw assembly (4) is connected to the linear electric cylinder (5) to realize Y r The end of the motion and linear electric cylinder (5) is connected to the pitch assembly (6), and the pitch assembly (6) drives the roll assembly (7) to achieve θ r The output end of the rolling assembly (7) drives the sub-stage external attachment (8) to realize γ r Roll motion and Z movement.

3. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: The number of sub-level external attachments (8) is 2-6.

4. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: A lead screw linear motion mechanism is installed in the center line cylinder of the angle attack mechanism (1) to realize the axial movement of the main stage model (9). The rear end and front end of the center circle seat of the radial radiation type bracket (2) are respectively connected to the angle attack mechanism (1) and the main stage model (9) through cone matching.

5. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: The rolling assembly (7) is a T-shaped right-angle structure. The rolling assembly (7) uses a servo motor to drive a harmonic reducer to drive a sub-stage external attachment (8) to achieve rolling motion.

6. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: A supporting rod is provided to install a sub-stage external attachment (8), wherein the front end of the supporting rod is a rod-shaped structure with a length-to-diameter ratio of 15-25, and the rear end is a variable-section rod-shaped structure.

7. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 6, characterized in that: The rear end of the support rod is preset with an offset angle or a vertical support arm.

8. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: An on-off detection circuit is provided between the sub-level external attachment (8) and the main-level model (9) to implement collision detection.

9. A wind tunnel multi-body multi-degree-of-freedom separation simulation test system, characterized by: The invention comprises a wind tunnel multi-body multi-degree-of-freedom separation simulation test device and a test section (10) as described in any one of claims 1 to 8, wherein the angle of attack mechanism (1) is arranged in the test section (10), the sub-stage external attachment (8) is located in the observation window of the test section (10), the sub-stage external attachment (8) is driven by its own driving device, and the initial position and the movement position of the sub-stage external attachment (8) are inspected and calibrated, so as to realize the simulation of the movement trajectory of the sub-stage external attachment (8) and the load measurement under multi-body and multi-posture conditions.

10. A wind tunnel multi-body multi-degree-of-freedom separation simulation test system according to claim 9, characterized in that: When the test section (10) is an open test section, the driving device is placed outside the airflow area of ​​the test section (10).

11. The wind tunnel multi-body multi-degree-of-freedom separation simulation test system according to claim 9, characterized in that: When the test section (10) is rectangular and the number of the sub-stage external attachments (8) is 2 or 4, the radial radiation type brackets (2) are arranged along the diagonal lines of the rectangular cross section of the test section (10).

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