Expansion flexibility variable loading device for folding rudder wing of initiating explosive device and test method

Abstract

The invention relates to a flexible variable loading device for unfolding a folding rudder wing of a firer device and a test method. In the device, one end of a loading plate is used for clamping the folding rudder wing, the other end of the loading plate is fixedly mounted on a loading disc, the loading disc is fixedly mounted on a connecting rod, the connecting rod is mounted on a bracket through a bearing, and a roller is mounted on a roller bracket; one end of the flexible polyester rope is fixed on the loading disc, the other end of the flexible polyester rope is fixed at one end of the tension spring after passing through the roller on the roller bracket, the other end of the tension spring is fixed at the upper end of the lead screw, and the lower end of the lead screw is fixed on the ground bracket; the encoder is fixed on the support, and a rotating shaft of the encoder is fixedly connected with the connecting rod and used for measuring the rotating angle, the angular speed and the angular acceleration of the folding rudder wing. The pyrotechnic device is installed in the installation cylinder, a pyrotechnic device pull rod is connected with one end of the tension sensor, the other end of the tension sensor is connected with the rudder wing connecting rod through the guide cylinder, the rudder wing is installed on the guide cylinder, and the tension sensor is used for measuring tension generated by the pyrotechnic device in the rotation process of the folding rudder wing.

Description

Technical Field

[0001] The invention relates to a flexible variable loading device and a test method for unfolding a folding rudder wing of a pyrotechnic device, which is suitable for flexible variable loading when the folding rudder wing is unfolded. Background Art

[0002] Rudder-wing folding technology has become a new trend in aircraft design due to its various outstanding advantages (high maneuverability and high platform adaptability).

[0003] Existing folding rudder wings all utilize sliders and elastic ropes to load the rudder wings when the two rudder wings are axially folded (retracted) or unfolded, and are not suitable for loading the rudder wings when they are radially folded (one rudder wing is folded into two parts).

[0004] The folding rudder wing deployment loading simulates the conditions of the folding rudder wings being deployed under headwind and headwind during aircraft launch. The rudder wing loading part is subjected to forward and reverse variable loading. It mainly simulates the deployment action of the folding rudder wings under the actual working conditions of the aircraft launch, and assesses the ignition performance of the pyrotechnic device. It is one of the important test items before the delivery of the pyrotechnic device.

[0005] When launching aircraft at different times and locations, the environmental conditions for the pyrotechnic device to actuate and unfold the folding rudder wings vary greatly. The wind force and wind direction will affect the load resistance when the pyrotechnic device actuates and unfolds the folding rudder wings.

[0006] The existing folding rudder wing deployment loading technology mainly uses a servo motor to load through a torque sensor-coupling-connecting shaft-coupling-loading plate-connecting shaft, and uses an encoder to measure the rotation angle, angular velocity, angular acceleration, etc. There are mainly the following problems:

[0007] (1) There are many rotating elements, and the moment of inertia generated by the rotational inertia during the loading movement is large. At the same time, because the movement speed of the wing surface driven by the pyrotechnic device is violent and fluctuates violently, it is difficult to control and the rotational inertia cannot be eliminated.

[0008] (2) The existing servo motor variable load loading test system has a large moment of inertia. After the folding rudder wings are unfolded and locked, the loading system continues to rotate forward, exceeding the structural strength of the folding rudder wings, causing damage to the rudder wings. Summary of the invention

[0009] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a flexible variable loading device and a test method for unfolding the folding rudder wings of a pyrotechnic device, so as to realize loading with variable direction and variable loading torque during the unfolding process of the folding rudder wings.

[0010] The solution to the technical problem of the present invention is: a flexible variable loading device for unfolding the folding rudder wing of a pyrotechnic device, characterized by comprising a loading plate, a loading disc, an encoder, a connecting rod, a bracket, a tension spring, a flexible polyester rope, a lead screw, a guide cylinder, a tension sensor, a mounting cylinder, a roller, and a roller bracket;

[0011] One end of the loading plate is used to clamp the folding rudder wing, and the other end is fixedly installed on the loading plate, the loading plate is fixedly installed on the connecting rod, the connecting rod is installed on the bracket through a bearing, the roller is installed on the roller bracket, one end of the flexible polyester rope is fixed on the loading plate, and the other end is fixed to one end of the tension spring after passing through the roller on the roller bracket, the other end of the tension spring is fixed to the upper end of the lead screw, and the lower end of the lead screw is fixed to the ground bracket; the encoder is fixed on the bracket, and the rotating shaft of the encoder is fixedly connected to the connecting rod, which is used to measure the rotation angle, angular velocity and angular acceleration of the folding rudder wing;

[0012] The pyrotechnic device is installed in the installation tube, the pyrotechnic device pull rod is connected to one end of the tension sensor, and the other end of the tension sensor is connected to the rudder wing connecting rod through the guide tube. The rudder wing is installed on the guide tube. The tension sensor is used to measure the tension generated by the pyrotechnic device during the rotation of the folding rudder wing.

[0013] Preferably, the loading plate, loading disc and folding rudder wing rotation axis are coaxial and have the same rotation radius.

[0014] Preferably, N loading rods are provided on the loading disk, and the flexible polyester rope is fixed on the loading disk by connecting the loading rods, the loading rods are involute or circular arc, and N is greater than or equal to 2.

[0015] Preferably, the strength of the flexible polyester rope is greater than twice the loading moment of the folded rudder wing.

[0016] Preferably, the measuring range of the tension sensor is greater than 1.5 times the peak value of the tension of the pyrotechnic device.

[0017] Preferably, when loading in the forward direction, the direction of the force on the flexible polyester rope is consistent with the unfolding direction of the folding rudder wing.

[0018] Preferably, when reversely loaded, the direction of the force on the flexible polyester rope is opposite to the unfolding direction of the folding rudder wing.

[0019] Preferably, the pulling-out direction of the flexible polyester rope is parallel to the plane of the loading disk and perpendicular to the rudder wing.

[0020] Another technical solution of the present invention is: a folding rudder wing performance test method, the method comprising the following steps:

[0021] S1. Before the test, the tension sensor is calibrated with a material testing machine to obtain the relationship between the output voltage and tension of the tension sensor;

[0022] S2, install the above-mentioned pyrotechnic device folding rudder wing unfolding flexible variable loading device, remove the pyrotechnic device and the tension sensor, use a torque wrench to rotate the loading plate until it reaches the initial position of the folding rudder wing, read the torque value, adjust the length of the flexible polyester rope and the extension of the lead screw until the torque value meets the preset requirements, and apply a preset initial torque to the folding rudder wing;

[0023] S3, install the pyrotechnic device and the tension sensor, control the pyrotechnic device to generate tension after working, the pyrotechnic device pulls the tension sensor and the rudder wing connecting rod, the folding part of the rudder wing first cuts off the shear pin, and then overcomes the loading force to rotate in place and lock;

[0024] S4, according to the encoder accuracy, the output pulse number-time, calculate the angle-time curve, angular velocity-time curve, and angular acceleration-time curve of the folding rudder wing in the working process of the pyrotechnic device when the folding rudder wing has a preset initial torque loading condition and the load changes gradually;

[0025] S5. Substitute the voltage output by the tension sensor into the relationship between the output voltage of the tension sensor and the tension to obtain a tension-time curve of the working process of the pyrotechnic device when the folding rudder wing is loaded with a preset initial torque and the load changes gradually.

[0026] In step S1, a relationship between the output voltage of the tension sensor and the tension is fitted according to the least squares method, F=aV+b, where F is the tension value, V is the voltage value output by the tension sensor, a and b are constant coefficients calculated by the least squares method during calibration, and the number of calibration points is not less than 6.

[0027] The beneficial effects of the present invention compared with the prior art are:

[0028] (1) The present invention adopts tension springs and lightweight flexible polyester ropes to replace the motor loading in the prior art, thereby reducing the moment of inertia and preventing the folding rudder wing from being subjected to excessive inertial impact after being fully unfolded, thereby preventing the rudder wing from being damaged.

[0029] (2) The present invention changes the installation direction of the tension spring and the lightweight polyester rope according to the needs to achieve forward and reverse loading.

[0030] (3) The loading points of the loading rod (flexible polyester rope) of the present invention are arranged in an involute manner, and the loading force radius is changed to achieve variable loading during the unfolding process of the folding rudder wing.

[0031] (4) The present invention realizes the loading of the folding rudder wing during the unfolding process by adopting the method of generating tension by deformation of the tension spring. Compared with the motor loading method in the prior art, the loading process of the folding rudder wing is simplified while satisfying the transient variable loading of the folding rudder wing.

[0032] (5) The present invention verifies the action and force conditions of the rudder wing during the unfolding process by testing the tension of the pyrotechnic device during the process of pulling the folded rudder wing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of unfolding a foldable wing according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of unfolding and folding a foldable wing according to an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of a flexible variable loading device for unfolding folding rudder wings of an pyrotechnic device according to an embodiment of the present invention;

[0036] Figure 4 This is a simplified diagram of the folded state of the variable loading rudder wing when loaded in the forward direction according to an embodiment of the present invention;

[0037] Figure 5 It is a left view of the variable loading rudder wing in the unfolded state when loaded in the forward direction according to the embodiment of the present invention;

[0038] Figure 6 This is a simplified diagram of the folded state of the variable loading rudder wing when reversely loaded according to an embodiment of the present invention;

[0039] FIG. 7( a ) is a front view of an involute loading plate according to an embodiment of the present invention;

[0040] FIG7( b ) is a cross-sectional view of an involute loading disk according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of an equidistant loading disk according to an embodiment of the present invention;

[0042] FIG9( a ) is a left side view of a connecting rod according to an embodiment of the present invention;

[0043] FIG9( b ) is a front view of the connecting rod according to the embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the embodiments.

[0045] Figure 1 This is a schematic diagram of the rudder wing surface expansion. Figure 2 It is a schematic diagram of the unfolding and folding of the folding wing surface; as can be seen from the figure, the rudder wing surface is unfolded and folded by rotating around the rotation axis.

[0046] like Figure 3 As shown, the present invention provides a flexible variable loading device for unfolding the folding rudder wing of a pyrotechnic device, comprising a loading plate 1, a loading plate 2, an encoder 3, a connecting rod 4, a bracket 5, a tension spring 6, a flexible polyester rope 7, a lead screw 8, a guide cylinder 11, a tension sensor 10, a mounting cylinder 9, and a roller 12;

[0047] One end of the loading plate is clamped at the rudder wing clamping part through a screw rod to clamp the folding rudder wing, and the other end is fixedly installed on the loading plate. The loading plate 2 is installed on the connecting rod through a key and a retaining ring. The connecting rod is installed on the bracket through a bearing. The roller 12 is installed on the roller bracket. One end of the flexible polyester rope is fixed on the loading plate, and the other end is fixed to one end of the tension spring after passing through the roller on the roller bracket. The other end of the tension spring is fixed to the upper end of the lead screw, and the lower end of the lead screw is fixed to the ground bracket; the lead screw is used to adjust the height between the tension spring and the ground. The encoder 3 is fixed on the bracket 5, and the rotating shaft of the encoder 3 is fixedly connected with the connecting rod 4 through a stop screw, and rotates synchronously, which is used to measure the rotation angle, angular velocity, and angular acceleration of the folding rudder wing.

[0048] The pyrotechnic device is installed on the mounting tube 9 with bolts and nuts. The pyrotechnic device pull rod is connected to one end of the tension sensor 10. The other end of the tension sensor is connected to the rudder wing connecting rod through the guide tube. The rudder wing is installed on the guide tube 11. The tension sensor 10 is used to measure the tension generated by the pyrotechnic device during the rotation of the folding rudder wing.

[0049] During installation, the loading plate 1 contacts and clamps the rudder wing clamping part. After installation, rotate the loading plate 2, and the loading plate 1, loading plate 2, and rudder wing should rotate smoothly.

[0050] Preferably, the loading plate contacts the clamping part of the rudder wing, the loading plate, the loading disc and the rudder wing rotating shaft are coaxial, have the same rotation radius, and the loading plate, the loading disc and the connecting rod have small mass.

[0051] Preferably, N loading rods are provided on the loading disk 2, and the flexible polyester rope 7 is fixed on the loading disk 2 by connecting the loading rods. The loading rods are involute lines or circular arcs, and N is greater than or equal to 2.

[0052] Preferably, the tension spring stiffness is not less than 1 N / mm.

[0053] Preferably, the strength of the flexible polyester rope is greater than twice the loading torque of the folded rudder wing.

[0054] Preferably, the measuring range of the tension sensor is greater than 1.5 times the peak tension of the pyrotechnic device, and the measuring range of the tension sensor can be selected based on 1.5 times the maximum tension of the pyrotechnic device when it is working.

[0055] The pulling direction of the flexible polyester rope 7 is parallel to the plane of the loading plate 2 and perpendicular to the rudder wing.

[0056] The present invention also provides a method for testing a folding rudder wing unfolding flexible variable loading device using the device, comprising:

[0057] S1. Calibrate the tension sensor 10 with a material testing machine before the test to obtain a relationship between the output voltage of the tension sensor 10 and the tension;

[0058] Use a material testing machine to calibrate the tension sensor according to JJG 669. The number of calibration steps is generally five equally spaced steps. The intercept and slope of the calibration line are calculated from the calibration data.

[0059] Specifically: according to the least squares method, the relationship between the output voltage of the tension sensor 10 and the tension is fitted. F=aV+b, where F is the tension value, V is the voltage value output by the tension sensor, a and b are constant coefficients calculated by the least squares method during calibration, and the number of calibration points is not less than 6.

[0060] S2, build the above-mentioned flexible variable loading device for unfolding the folding rudder wing, and with the pyrotechnic device and the tension sensor removed, use a torque wrench to rotate the loading disk 2 until it reaches the initial position of the folding rudder wing, read the torque value, adjust the length of the flexible polyester rope 7 and the extension of the lead screw 8 until the torque value meets the preset requirements, and apply a preset initial torque to the folding rudder wing;

[0061] S3, install the pyrotechnic device and the tension sensor, control the pyrotechnic device to generate tension after working, the pyrotechnic device pulls the tension sensor 10 and the rudder wing connecting rod, the rudder wing folding part first cuts off the shear pin, and then overcomes the loading force to rotate in place and lock; Figure 4 , Figure 5 shown.

[0062] S4, according to the accuracy of encoder 3 and the number of pulses outputted-time, calculate the angle-time curve, angular velocity-time curve, and angular acceleration-time curve of the folding rudder wing during the operation of the pyrotechnic device when the folding rudder wing has a preset initial torque loading condition and the load changes gradually;

[0063] S5. Substitute the voltage output by the tension sensor 10 into the relationship between the output voltage of the tension sensor 10 and the tension to obtain the tension-time of the working process of the pyrotechnic device when the folding rudder wing is loaded with a preset initial torque and the load changes gradually.

[0064] The voltage and tension were numerically fitted according to the least square method to obtain the tension-time curve of the pyrotechnic device-rudder wing.

[0065] The present invention can realize forward loading and reverse loading by exchanging the positions of the flexible polyester rope 7, the roller 12 and the tension spring relative to the loading plate 2. When loading forward, the direction of the force on the flexible polyester rope 7 is consistent with the direction of unfolding the folding rudder wing; when loading forward, the direction of the force on the flexible polyester rope 7 is consistent with the direction of unfolding the folding rudder wing. Figure 6 shown.

[0066] As a preferred solution, the accuracy of the selected encoder can be determined by calculating the rotation time based on the angular velocity and angular acceleration of the folding rudder wing.

[0067] As a preferred solution, the specifications and models of the tension spring, including the stiffness, initial size and final size of the tension spring, can be determined according to the rotation stroke and the loading torque. The deformation size of the tension spring should be greater than the rotation stroke, and the product of the stiffness of the tension spring and the deformation size of the tension spring should be greater than the loading torque.

[0068] The spring stiffness k is related to the shear modulus, material diameter, effective number of turns, and median diameter of the spring:

[0069]

[0070] Where G is the shear modulus of the tension spring (MPa), d is the material diameter (mm), n is the number of effective coils of the tension spring, and D is the mean diameter of the tension spring (mm).

[0071] As a preferred solution, the size of the loading plate can be determined according to the size of the loading part of the folded part of the rudder wing and the loading torque, including thickness, length, connection size and overall size. The thickness of the loading plate should ensure that it does not deform during the rotation of the rudder wing, the length should be as small as possible, the connection size should ensure reliable connection during the rotation process, and the overall size should ensure small wind resistance during the rotation process;

[0072] As a preferred solution, the position and size of the loading disk and the loading plate can be determined according to the rotation radius of the loading part of the folding part of the rudder wing. The loading disk is coaxial with the rotation axis of the folding rudder wing, and the radius of the loading plate fixed on the loading disk is the same as the rotation radius of the loading part of the folding part of the rudder wing.

[0073] As a preferred solution, the position and size curve of the loading rod (flexible polyester rope) on the loading plate can be determined according to the loading torque curve of the folding part of the rudder wing. For equal torque loading, the loading rod is on the same circle of the loading plate. For variable torque loading, the loading rod is arranged in an involute shape. The distance between the loading rod and the center of the loading plate gradually decreases and increases, and the difference between the distances between two adjacent loading rods and the center of the circle is equal. During the loading process of the flexible polyester rope, each loading rod is subjected to force in turn. As shown in Figure 7(a), Figure 7(b), Figure 8 shown.

[0074] As a preferred solution, the size of the connecting rod and the bracket can be determined according to the rotation radius of the loading part of the folding part of the rudder wing. The connecting rod is coaxial with the rotation axis of the folding rudder wing, and the height of the bracket should be larger than the size of the folded downward part of the folding rudder wing. The structure of the connecting rod is shown in Figure 9 (a) and Figure 9 (b).

[0075] As a preferred solution, the specification and size of the flexible polyester rope can be determined according to the loading torque of the folded part of the rudder wing. The strength of the flexible polyester rope should be greater than 2 times the loading torque of the folded rudder wing.

[0076] As a preferred solution, the size of the guide tube can be determined according to the interface size of the folding rudder wing and the pyrotechnic device. The interface size of the guide tube is consistent with the interface size of the folding rudder wing and the pyrotechnic device. The inner diameter of the guide tube should be larger than the outer diameter of the folding rudder wing connecting rod, and the height of the guide tube should be smaller than the length of the cylindrical section of the folding rudder wing connecting rod.

[0077] As a preferred solution, the size of the installation tube can be determined according to the size of the pyrotechnic device and the tension sensor. The internal space of the installation tube should be convenient for installing the tension sensor, and the height of the installation tube should be greater than 1.5 times of the tension sensor.

[0078] Preferably, the loading plate is made of aluminum.

[0079] Preferably, the loading plate is made of steel, and when determining the position dimension curve of the loading rod (flexible polyester rope) on the loading plate, the position dimension curve can be an involute or an arc line. The involute or arc line is selected according to the change requirements of the loading force.

[0080] In summary, the present invention uses a high-strength, low-elongation, lightweight flexible polyester rope 7 through a reasonably designed tension transmission path of the tension spring 6, and accurately loads the folding part of the rudder wing by adjusting the height position of the roller 12. It mainly includes several aspects: rudder wing fixation, pyrotechnic device tension transmission, loading force transmission, and signal conversion. Specifically, the rudder wing is fixed through a guide cylinder 11 and a mounting cylinder 9, and the rudder wing folding part pull rod is connected to the tension sensor and the pyrotechnic device. One end of the loading plate clamps the rudder wing folding part, and the other end is vertically fixed on the loading plate 2. The loading plate 2 is fixed on the connecting rod through a key, and the connecting rod is fixed on the bearing bracket. One end of the flexible polyester rope 7 is fixed on the loading plate 2, and the other end is fixed on the tension spring 6 through the roller 12. The other end of the tension spring 6 is fixed on the screw 8. After the pyrotechnic device works, the piston rod pulls the rudder wing folding through the tension sensor Part of the pull rod, the folding part of the rudder wing cuts off the shear pin, overcomes the loading force and rotates into place; adjusts the height and front and rear positions of the roller 12 to ensure that the pulling direction of the flexible polyester rope 7 is parallel to the loading disk 2 and perpendicular to the rudder wing; uses the mechanical deformation force of the high-strength, low-elongation, lightweight flexible polyester rope 7 and the tension spring 6 to reduce the additional moment of inertia; calculates the deformation coefficient of the tension spring 6 according to the rotation stroke and the loading torque, determines the specifications and models of the tension spring 6, the deformation size of the tension spring should be greater than the rotation stroke, and the product of the stiffness and the deformation size of the tension spring should be greater than the loading torque; uses the screw 8 to fine-tune the loading force to quickly adjust the loading force. The voltage signal generated by the tension is calibrated by the least squares method to obtain the tension-time curve generated by the pyrotechnic device. The present invention has a small moment of inertia, is easy to build and operate, and can obtain the angle-time curve, angular velocity-time curve, angular acceleration-time curve of the complete folding rudder wing and the tension-time curve of the pyrotechnic device. The repeatability is good, the deviation of multiple measurements is small, and the adverse effect of the large moment of inertia of the folding rudder wings when loaded and unfolded is eliminated.

[0081] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A flexible variable loading device for unfolding folding rudder wings of a pyrotechnic device, characterized in that It comprises a loading plate (1), a loading disc (2), an encoder (3), a connecting rod (4), a bracket (5), a tension spring (6), a flexible polyester rope (7), a lead screw (8), a guide cylinder (11), a tension sensor (10), a mounting cylinder (9), a roller (12), and a roller bracket; One end of the loading plate (1) is used to clamp the folding rudder wing, and the other end is fixedly mounted on the loading plate (2), the loading plate (2) is fixedly mounted on the connecting rod (4), the connecting rod (4) is mounted on the bracket (5) through a bearing, the roller (12) is mounted on the roller bracket, one end of the flexible polyester rope (7) is fixed on the loading plate (2), and the other end is fixed to one end of the tension spring (6) after passing through the roller (12) on the roller bracket, the other end of the tension spring (6) is fixed to the upper end of the lead screw (8), and the lower end of the lead screw (8) is fixed to the ground bracket; the encoder (3) is fixed on the bracket (5), the rotating shaft of the encoder (3) is fixedly connected to the connecting rod (4), and is used to measure the rotation angle, angular velocity, and angular acceleration of the folding rudder wing; The pyrotechnic device is installed in the installation tube (9), the pyrotechnic device pull rod is connected to one end of a tension sensor (10), the other end of the tension sensor (10) is connected to a rudder wing connecting rod passing through a guide tube (11), the rudder wing is installed on the guide tube (11), and the tension sensor (10) is used to measure the tension generated by the pyrotechnic device during the rotation of the folding rudder wing.

2. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: The loading plate (1), the loading disc (2) and the folding rudder wing rotation axis are coaxial and have the same rotation radius.

3. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: The loading disk (2) is provided with N loading rods, and the flexible polyester rope (7) is fixed on the loading disk (2) by connecting the loading rods, the loading rods are in the form of involutes or circular arcs, and N is greater than or equal to 2.

4. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: The strength of the flexible polyester rope is greater than twice the loading moment of the folding rudder wing.

5. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: The measuring range of the tension sensor is greater than 1.5 times the peak value of the tension of the pyrotechnic device.

6. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: When loading in the forward direction, the direction of the force on the flexible polyester rope (7) is consistent with the unfolding direction of the folding rudder wing.

7. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: When reverse loading is performed, the direction of the force on the flexible polyester rope (7) is opposite to the unfolding direction of the folding rudder wing.

8. A flexible variable loading device for unfolding folding rudder wings of an explosive device according to claim 1, characterized in that: The pulling direction of the flexible polyester rope (7) is parallel to the plane of the loading plate (2) and perpendicular to the rudder wing.

9. A folding rudder wing performance test method, characterized in that The steps include: S1. Calibrate the tension sensor (10) using a material testing machine before the test to obtain a relationship between the output voltage of the tension sensor (10) and the tension; S2. Install the flexible variable loading device for unfolding the folding rudder wing of the pyrotechnic device as described in claim 1. With the pyrotechnic device and the tension sensor removed, use a torque wrench to rotate the loading plate (2) until it reaches the initial position of the folding rudder wing, read the torque value, adjust the length of the flexible polyester rope (7) and the extension of the lead screw (8) until the torque value meets the preset requirements, and apply a preset initial torque to the folding rudder wing; S3, install the pyrotechnic device and the tension sensor, control the pyrotechnic device to generate tension after working, the pyrotechnic device pulls the tension sensor (10) and the rudder wing connecting rod, the rudder wing folding part first cuts off the shear pin, then overcomes the loading force and rotates into place and locks; S4, according to the accuracy of the encoder (3) and the number of pulses outputted-time, calculating the angle-time curve, angular velocity-time curve, and angular acceleration-time curve of the folding rudder wing in the working process of the pyrotechnic device when the folding rudder wing is loaded with a preset initial torque and the load changes gradually; S5. Substituting the voltage output by the tension sensor (10) into the relational equation between the output voltage of the tension sensor (10) and the tension, obtain a tension-time curve of the working process of the pyrotechnic device when the folding rudder wing is loaded with a preset initial moment and the load changes gradually.

10. A folding rudder wing performance test method according to claim 9, characterized in that: In step S1, a relationship between the output voltage of the tension sensor (10) and the tension is fitted according to the least square method, namely, F=aV+b, where F is the tension value, V is the voltage value output by the tension sensor, and a and b are constant coefficients calculated by the least square method during calibration, and the number of calibration points is not less than 6.

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