A multi-body multi-degree-of-freedom separation simulation test system for a wind tunnel

Abstract

The application 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 support rod, a yaw assembly, a linear electric cylinder, a pitch assembly, a roll assembly, a sub-stage external object and a main-stage model, and the attack angle mechanism installed in a test section of a wind tunnel realizes various postures of the main-stage model, such as an attack angle, a roll angle and a yaw angle. The radial radiation type support, the right-angle support rod, the yaw assembly, the linear electric cylinder, the pitch assembly, the roll assembly and the sub-stage external object form a series type six-degree-of-freedom motion device, each sub-stage external object can realize the control of six degrees of freedom relative to the main-stage model manually or automatically, a plurality of sub-stage external objects and a driving system are arranged along a circumference according to needs relative to the main-stage model, each driving device is controlled to move, the multi-degree-of-freedom position and posture of the plurality of sub-stage external objects are changed in the test section of the wind tunnel, the simulation of a motion track of the sub-stage external object and the load measurement of aerodynamic relative interference under multi-body and multi-posture are realized.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel experimental aerodynamics, specifically relating to a wind tunnel multibody multi-degree-of-freedom separation simulation test system. Background Technology

[0002] During the flight phases of rocket multi-booster stage separation and aircraft multi-external-charge launch and release, the separated bodies and the parent body are in complex, mutually interfering flow fields. Shock wave interference and dangerous separation characteristics can easily lead to collisions and damage between the multiple bodies, endangering the safety of the main engine. Therefore, it is essential 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-based wind tunnel simulation experiments.

[0003] With the increasing demands of aircraft applications, test simulations need to simulate the simultaneous separation of more than two objects. However, the existing CTS test technology used in China can only simulate the test of one object. In the test, the position of the other object can only be fixed, resulting in a greater deviation between the test results and the actual situation, which makes it difficult to meet the test requirements. Summary of the Invention

[0004] The purpose of this 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, the sub-stage attachments and the main stage model form a relative coordinate system, simplifying the motion solution equations. Multiple sub-stage attachments and drive systems are arranged circumferentially relative to the main stage model as needed. The movement of each drive device is controlled, realizing the multi-degree-of-freedom position and attitude changes of multiple sub-stage attachments in the wind tunnel test section. This enables the simulation of the motion trajectory of the sub-stage attachments and the measurement of aerodynamic relative disturbance loads under multi-body and multi-attitude conditions.

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

[0006] A wind tunnel multibody multi-degree-of-freedom separation simulation test device includes an angle-of-attack mechanism, a radially radial support, a right-angle support rod, a yaw component, a linear electric cylinder, a pitch component, a roll component, a sub-stage external attachment, and a main stage model. The radially radial support of the angle-of-attack mechanism is mounted on the main stage model. A drive device is provided at the end of the support rod of the radially radial support. One end of the right-angle support rod is connected to the drive device at the end of the radially radial support, and the other end is connected to the yaw component. The yaw component achieves yaw motion relative to the right-angle support rod. The linear electric cylinder is connected to the yaw component to form a sliding pair. A pitch component is installed at the end of the linear electric cylinder. The linear electric cylinder is used to achieve radial movement, and the pitch component achieves rotation. The input end of the roll component is connected to the pitch component, and the output end is connected to the sub-stage external attachment. The sub-stage external attachment is set on the circumference of the main stage model, and the roll component drives the sub-stage external attachment to achieve roll motion.

[0007] An OXYZ coordinate system is established with the axis of the main model as the X-axis and the center of the main model as the origin O. The radially radiating support connects to the input end of the right-angle support rod, enabling the right-angle support rod to move in the X-direction. r The center line of the input shaft hole of the yaw assembly is orthogonal to the center line of the output shaft hole, and the yaw assembly achieves Z-axis rotation relative to the right-angle support. r To move, and ψ r To rotate, the output of the yaw component is connected to a linear electric cylinder to achieve Y-axis rotation. r The end of the linear electric cylinder is connected to a pitch assembly, which drives the roll assembly to achieve θ. r The motion and rolling component output drives the sub-level external device to achieve γ. r Rolling motion and Z-axis movement.

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

[0009] A lead screw linear motion mechanism is installed inside the center cylinder of the angle-of-attack mechanism to realize the axial movement of the main stage model. The rear end and front end of the radially radiating support center circular seat are connected to the angle-of-attack mechanism and the main stage model respectively through conical engagement.

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

[0011] The sub-level external attachments are installed using support rods. The front end of the support rod is a rod-shaped structure with a length-to-diameter ratio of 15-25, and the rear end is a rod-shaped structure with a variable cross-section.

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

[0013] Collision detection is achieved by setting up a continuity detection circuit between the child-level external object and the main-level model.

[0014] A wind tunnel multi-body multi-degree-of-freedom separation simulation test system includes a wind tunnel multi-body multi-degree-of-freedom separation simulation test device and a test section. The angle-of-attack mechanism is set in the test section, and the sub-stage external attachment is located in the observation window of the test section. The sub-stage external attachment is driven by its own drive device. The initial position and motion position of the sub-stage external attachment are checked and calibrated to realize the simulation of the motion trajectory of the sub-stage external attachment and the load measurement under multi-body and multi-attitude conditions.

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

[0016] When the test section is rectangular and the number of sub-level external attachments is 2 or 4, the radial support is arranged along the diagonal of the rectangular cross-section of the test section.

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

[0018] (1) This invention adopts a series-type orthogonal six-degree-of-freedom motion device. The radially radiating support and the attitude angle of the main stage model on the angle-of-attack mechanism are synchronized, so that the sub-stage external attachments and the main stage model form a relative coordinate system, simplifying the motion calculation equations. Each sub-stage external attachment can be manually or automatically controlled to achieve 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 needed, and the movement of each drive device is controlled. In the wind tunnel test section, the multi-degree-of-freedom position and attitude changes of multiple sub-stage external attachments are realized, realizing the simulation of the motion trajectory of the sub-stage external attachments and the load measurement of aerodynamic relative disturbances under multi-body and multi-attitude conditions.

[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 attachment and the main stage model, and maximize the observation range of the sub-stage attachment in the optical observation window of the test section.

[0020] (3) The present invention provides collision detection and recognition circuits between each sub-level external object and the main-level external object to identify the position interference information between them. Attached Figure Description

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

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

[0023] Figure 3 This is a front view schematic diagram of the wind tunnel multibody 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 for the sub-level external attachments of the present invention;

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

[0026] Figure 6 This is a schematic diagram of the external anteroom of the open-type test section drive system of the present invention;

[0027] Figure 7 This is a schematic diagram of the supported open-type test section drive system used in this invention;

[0028] Figure 8 This is a schematic diagram of the external isometric projection of the drive system of the open test section of the wind tunnel multibody multi-degree-of-freedom separation simulation test system of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail 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 various attitudes of the main stage model 9, including angle of attack, roll angle, and yaw angle. A series of orthogonal six-degree-of-freedom motion devices are formed by the radially radiating support 2, right-angle strut 3, yaw assembly 4, linear electric cylinder 5, pitch assembly 6, roll assembly 7, and sub-stage attachments 8. Each sub-stage attachment 8 can be manually or automatically controlled in six degrees of freedom relative to the main stage model 9. The control of each degree of freedom can be forward and reversed based on the initial position. Multiple sub-stage attachments and matching six-degree-of-freedom motion devices are arranged circumferentially relative to the main stage model according to the required number and initial position, controlling the movement of each drive device. This allows for multi-degree-of-freedom position and attitude changes of multiple sub-stage attachments within the wind tunnel test section, simulating the motion trajectory of the sub-stage attachments and measuring the load of aerodynamic relative disturbances under multi-body, multi-attitude conditions.

[0031] The angle-of-attack mechanism 1 enables the main stage model 9 to move along its axial direction, expanding the relative movement distance between the sub-stage attachment 8 and the main stage model 9, and maximizing the observation range of the sub-stage attachment 8 within the optical observation window of the test section 10.

[0032] like Figure 4 As shown, the radial support 2 synchronizes the attitude angle of the main stage model 9 on the angle-of-attack mechanism 1, so that the sub-stage attachment 8 and the main stage model 9 form a relative coordinate system, simplifying the motion calculation equations. It forms a radial support, such as an X-shape or a star-shaped support, according to the number and position requirements of the sub-stage attachments 8.

[0033] The windward face of the radially radiating support 2 is set as a conical surface to reduce shock wave drag. Each support end of the radially radiating support 2 has a drive device to drive the right-angle support 3 to move along the X direction. When the subspan super-wind tunnel test section is rectangular, and the number of stage external attachments 8 is 2 or 4, the radially radiating support 2 is arranged along the diagonal of the rectangle, which can increase the movement distance in the Y and Z directions.

[0034] One end of the right-angle support rod 3 is connected to the X-axis drive device of the radial support 2, and the other end is connected to the yaw assembly 4. The yaw assembly 4 moves relative to the right-angle support rod 3 in the Y-axis and rotates in the Y-axis, i.e., performs yaw motion.

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

[0036] The rolling assembly 7 has a T-shaped right-angle structure. 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] Sub-stage external attachment 8 is located inside the observation window of test section 10, and the density of shock wave interference is quantitatively measured by focusing schlieren.

[0038] like Figure 5 As shown, when the sub-level external attachment 8 is embedded or retracted at the tail, and its relative size to the main-level model 9 is small, slender support rods with different transition angles can be used to install the sub-level external attachment 8. The front end of the support rod has a large length-to-slenderness ratio (L / D) of 15-25 to meet the support requirements of being built into the slender body model, and to ensure that the tail end of the model has a reserved straight section length for the test standard. The rear end is designed as a variable cross-section constant stiffness beam. Figure 5 b is an example setting where offset A is less than 15°, ensuring that the head of the sub-level external attachment 8 can enter the interior of the embedded or tail-retracted main-level model 9. Figure 5 c represents a design example with a large offset distance Loff, where the vertical support arm uses a V-shaped structure for airflow guidance. Figure 5 b Figure 5 Because of the pre-set offset angle and distance, it can move according to the positive and negative directions of the aerodynamic load of the sub-stage external attachment 8, avoiding... Figure 5 a) Due to the excessively large cross-section of the rear support rod, it can only move in a direction away from its original position.

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

[0040] like Figure 7 and Figure 8 As shown, when test section 10 is an open test section, in order to reduce the impact of the obstruction 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 uses the belly support alone to support the main stage model 9, 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 tunnel coordinate system is used for calculation.

[0041] Collision detection is achieved by setting up a continuity detection circuit between the sub-level external object 8 and the main-level model 9. The collision information of the collision component is identified by corresponding collision circuits for each component number.

[0042] The above description is only the best specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the protection scope of the present invention.

[0043] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A wind tunnel multi-body multi-degree-of-freedom separation simulation test device, characterized in that: The system includes an angle-of-attack mechanism (1), a radially radiating support (2), a right-angle strut (3), a yaw assembly (4), a linear electric cylinder (5), a pitch assembly (6), a roll assembly (7), sub-stage attachments (8), and a main stage model (9). The angle-of-attack mechanism (1) and the radially radiating support (2) are mounted on the main stage model (9). Each radially radiating support (2) has a drive device at the end of its strut. One end of the right-angle strut (3) is connected to the drive device at the end of the radially radiating support (2). The radially radiating support (2) is connected to the input end of the right-angle strut (3) to achieve the right-angle strut ( 3) Axial movement, one end connected to yaw component (4), yaw component (4) relative to right-angle support rod (3) to achieve yaw movement, linear electric cylinder (5) connected to yaw component (4) to form sliding pair, pitch component (6) installed at the end of linear electric cylinder (5), linear electric cylinder (5) is used to achieve radial movement, pitch component (6) achieves rotation, roll component (7) input end connected to pitch component (6), output end connected to sub-stage external attachment (8), sub-stage external attachment (8) is set on the circumference of main stage model (9), roll component (7) drives sub-stage external attachment (8) to achieve roll movement.

2. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: With the axis of the main model (9) as the X-axis and the center of the main model (9) as the origin O, an OXYZ coordinate system is established. The radially radiating support (2) connects to the input end of the right-angle support (3) to realize the movement of the right-angle support (3) in the X direction. r The center line of the input shaft hole of the yaw assembly (4) is orthogonal to the center line of the output shaft hole. The yaw assembly (4) achieves Z-axis rotation relative to the right-angle support rod (3). r To move, and ψ r To rotate, the output end of the yaw component (4) is connected to the linear electric cylinder (5) to realize Y rotation. r The end of the linear electric cylinder (5) is connected to the pitch assembly (6), which drives the roll assembly (7) to achieve θ. r The motion and rolling component (7) output drives the sub-level external object (8) to achieve γ. r Rolling motion and Z-axis 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: The angle-of-attack mechanism (1) has a lead screw linear motion mechanism installed inside the centerline cylinder to realize the axial movement of the main stage model (9). The rear end and front end of the radially radiating bracket (2) center round seat are connected to the angle-of-attack mechanism (1) and the main stage model (9) respectively through a cone fit.

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 the sub-stage external object (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: The support rod is used to install the sub-level external attachment (8). The front end of the support rod is a rod-shaped structure with a length-to-diameter ratio of 15-25, and the rear end is a rod-shaped structure with a variable cross-section.

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 pre-set with an offset angle or a vertical support arm is provided.

8. The wind tunnel multi-body multi-degree-of-freedom separation simulation test device according to claim 1, characterized in that: A continuity detection circuit is set between the sub-level external object (8) and the main level model (9) to realize collision detection.

9. A wind tunnel multibody multi-degree-of-freedom separation simulation test system, characterized in that: The device includes 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 1-8. The angle-of-attack mechanism (1) is set inside the test section (10). The sub-stage external attachment (8) is located inside the observation window of the test section (10). The sub-stage external attachment (8) is driven by its own drive device. The initial position and motion position of the sub-stage external attachment (8) are checked and calibrated to realize the simulation of the motion trajectory of the sub-stage external attachment (8) and the load measurement under multi-body and multi-attitude conditions.

10. A wind tunnel multibody 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 drive device is placed outside the airflow area of ​​the test section (10).

11. A wind tunnel multibody 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 sub-level external attachments (8) is 2 or 4, the radially radiating brackets (2) are arranged along the diagonal of the rectangular cross section of the test section (10).

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