Low-disturbance high-response-speed release device and wind tunnel test system

Abstract

The utility model relates to a low-disturbance high-response-speed release device and a wind tunnel test system. The releasing device comprises a base, a limiting stopper and a cutter. A rope for hanging a test object is connected to the base. The limiter is provided with a limiting hole, the rope penetrates through the limiting hole, and the rope is in clearance fit with the limiting hole. One side of the hole wall of the limiting hole is open so that the rope can enter the limiting hole in the radial direction. The two limiting stoppers are arranged in the length direction of the rope in a spaced mode. And the cutter is positioned between the two limiters. The cutter is configured to be connected to the base in a controlled and slidable mode along the plane perpendicular to the length direction of the rope. The releasing device can prevent or reduce transverse movement and shaking of the rope, so that interference to the initial state of a test object is reduced or avoided, and the effect of improving the test precision is achieved. The experiment preparation time can be shortened, and the experiment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wind tunnel tests, and particularly to a low-disturbance and high-response-speed release device and a wind tunnel test system. Background Art

[0002] A high-speed wind tunnel is an experimental device specifically used to simulate high-speed fluids. By conducting experiments in a high-speed wind tunnel, researchers can obtain data on the lift, drag, stability, and control characteristics of high-speed aircraft, which is crucial for designing aircraft that can operate safely and efficiently under high-speed conditions.

[0003] In related technologies, the test object usually adopts the method of hanging and freely falling, that is, the test object is suspended in the wind tunnel by a rope. A cutter is arranged on one side of the rope. When starting the test, the cutter is controlled according to the instruction to cut the rope at high speed, so as to realize the accurate and rapid release of the test object.

[0004] However, in the above scheme, the cutter will generate a lateral shearing force on the rope during the cutting process, resulting in the lateral shaking of the rope, which in turn interferes with the initial state of the test object at the lower end and ultimately affects the test accuracy. Summary of the Utility Model

[0005] In view of the above problems, the present utility model is proposed to provide a low-disturbance and high-response-speed release device and a wind tunnel test system that overcome the above problems or at least partially solve the above problems, aiming to solve the problem that the cutter of the existing release device causes the lateral shaking of the rope when cutting the rope.

[0006] Specifically, the present utility model provides the following technical solutions:

[0007] A low-disturbance and high-response-speed release device includes a base, a limiter, and a cutter.

[0008] A rope for hanging a test object is connected to the base.

[0009] The limiter is provided with a limiting hole, the rope passes through the limiting hole, and the rope is in clearance fit with the limiting hole. One side of the hole wall of the limiting hole is open to allow the rope to enter the limiting hole along the radial direction. There are two limiters, and they are arranged at intervals along the length direction of the rope.

[0010] The cutter is located between the two limiters. The cutter is configured to be controllably slidably connected to the base in a plane perpendicular to the length direction of the rope.

[0011] Optionally, the release device further includes a driving device, and the driving device includes an actuator, a linear guide, and a tool holder.

[0012] The actuator is fixedly arranged on the base and configured to controllably drive the cutter to slide.

[0013] The linear guide is fixedly arranged on the base, and the cutter is slidably connected to the linear guide along a straight line.

[0014] The cutter is fixedly connected to the tool holder. The tool holder is slidably connected to the linear guide, and the tool holder is fixedly connected to the telescopic end of the actuator.

[0015] Optionally, the test object is suspended by a plurality of the ropes. Each of the ropes corresponds to a set of the limiters and a cutter.

[0016] A plurality of the cutters are all fixedly connected to the tool holder.

[0017] Optionally, the response time of the actuator is less than or equal to 10 ms, and the repeatability accuracy of the response time is less than or equal to 0.5 ms.

[0018] Optionally, the base is horizontally arranged and is provided with an avoidance hole allowing the rope to pass through.

[0019] The release device further includes a lifting mechanism. The lifting mechanism is fixedly arranged on the upper side of the base, and the rope is connected to the lifting mechanism.

[0020] Both the limiter and the cutter are located on the lower side of the base.

[0021] Optionally, the limiter includes a limit seat and a limit ring. The limit seat is fixedly arranged on the base. The limit hole is formed inside the limit ring, and the limit ring is hinged to the limit seat along an axis parallel to the axial direction.

[0022] The limit ring is further provided with a limit block to open or close the opening of the hole wall of the limit hole.

[0023] Optionally, the distance between two adjacent limiters is less than 1.2 times the thickness of the cutter.

[0024] Optionally, the cutter is slidably connected to the base along a straight line.

[0025] The cutting direction of the cutter and the opening direction of the corresponding limit hole form an angle of 90 - 180 degrees.

[0026] Optionally, the cutting edge of the cutter is inclined, and the angle between the cutting edge and the cutting direction is 15 - 75 degrees.

[0027] On the other hand, the present utility model further provides a wind tunnel test system. The wind tunnel test system includes a controller, a collector for obtaining the state of a test object, and the above-mentioned releasing device, wherein the controller is provided with a synchronizer, and the synchronizer is in signal connection with both the releasing device and the collector.

[0028] In the releasing device of the present utility model, the cutter is used to cut the rope, and the stopper can limit the rope hanging the test object. Specifically, the two stoppers are respectively on both sides of the cutter, and the rope is in clearance fit with the limiting hole. The limiting hole can limit the rope in the lateral direction of the rope. When the cutter cuts the rope in the vertical direction, the hole walls of the two limiting holes can block the rope to prevent or reduce the lateral movement and shaking of the rope, thereby reducing or avoiding interfering with the initial state of the test object and achieving the effect of improving the test accuracy. On the other hand, one side of the hole wall of the limiting hole is open, which is convenient for the test personnel to place the rope in the limiting hole along the radial direction of the limiting hole, can reduce the experimental preparation time and improve the experimental efficiency.

[0029] Through the following detailed description of specific embodiments of the present utility model in conjunction with the drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Some specific embodiments of the present utility model will be described in detail hereinafter with reference to the drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0031] Figure 1 is a schematic structural diagram of a releasing device according to an embodiment of the present utility model;

[0032] Figure 2 is a schematic structural diagram of a releasing device according to an embodiment of the present utility model;

[0033] Figure 3 is a schematic partial structural diagram of a releasing device according to an embodiment of the present utility model;

[0034] Figure 4 is according to Figure 3 a schematic enlarged view of part A in;

[0035] Figure 5 is a schematic partial bottom view of a releasing device according to an embodiment of the present utility model;

[0036] Figure 6 is a schematic partial sectional view of a releasing device according to an embodiment of the present utility model along a horizontal plane;

[0037] Figure 7 is a schematic partial sectional view of the release device according to an embodiment of the present utility model along a horizontal plane;

[0038] Figure 8 is a schematic partial sectional view of the release device according to an embodiment of the present utility model along a horizontal plane;

[0039] Figure 9 is a schematic partial sectional view of the release device according to an embodiment of the present utility model along a horizontal plane;

[0040] Figure 10 is a schematic partial sectional view of the release device according to an embodiment of the present utility model along a vertical plane;

[0041] Figure 11 is a schematic block diagram of a wind tunnel test system according to an embodiment of the present utility model;

[0042] Figure 12 is a schematic flow chart of a control method for a wind tunnel test system according to an embodiment of the present utility model.

[0043] List of reference numerals:

[0044] 100, release device; 110, base; 111, avoidance hole; 120, limiter; 121, limiting hole; 122, rope inlet groove; 123, limiting seat; 124, limiting ring; 125, limiting block; 126, tool passing hole; 130, cutter; 140, driving device; 141, actuator; 141a, telescopic end; 142, linear guide; 143, tool holder; 150, lifting mechanism; 200, controller; 210, synchronizer; 300, collector; 400, computer; 500, rope; 600, test object. Detailed implementation manners

[0045] The following will refer to Figures 1 to 12 to describe the low-disturbance and high-response-speed release device and the wind tunnel test system of the embodiments of the present utility model. Among them, the orientation or positional relationship indicated by "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "lateral", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, one or more of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0047] Unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", "coupled", "fixed", "coupled", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present utility model according to specific circumstances.

[0048] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. That is, in the description of this embodiment, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", or "underneath" the second feature may be the first feature being directly below or obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0049] In the description of this embodiment, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

[0050] Figure 1 is a schematic structural diagram of a release device according to an embodiment of the present utility model, referring to Figure 1 and in combination with Figures 2 - 12, an embodiment of the present utility model provides a low-disturbance and high-response-speed release device 100, which includes a base 110, a stopper 120 and a cutter 130. A rope 500 for hanging a test object 600 is connected to the base 110. The stopper 120 is provided with a limiting hole 121, the rope 500 passes through the limiting hole 121, and the rope 500 has a clearance fit with the limiting hole 121. One side of the hole wall of the limiting hole 121 is open to allow the rope 500 to enter the limiting hole 121 radially. There are two stoppers 120, which are arranged at intervals along the length direction of the rope 500. The cutter 130 is located between the two stoppers 120. The cutter 130 is configured to be controllably slidably connected to the base 110 on a plane perpendicular to the length direction of the rope 500.

[0051] The test object 600 can be an aircraft model, a model of a dropped item dropped by an aircraft, etc. After the cutter 130 cuts off the hanging rope 500, the test object 600 freely falls in the wind tunnel in a preset initial state (attitude), meets the high-speed airflow in the wind tunnel, so as to simulate the operation of the test object 600 under high-speed conditions. Limited by actual physical conditions, the specifications and dimensions of high-speed wind tunnels are usually small, and the effective test time of the test object 600 in them is short. Generally, it is required that the release device 100 has a full-course response time of milliseconds and a time repetition accuracy of milliseconds. In the related art, the cutting action of the cutter 130 will generate a lateral shearing force on the rope 500, causing the rope 500 to shake laterally, which in turn interferes with the initial state of the test object 600 at the lower end of the rope 500, and finally affects the test results.

[0052] In this embodiment, the base 110 can be set on the upper side of the wind tunnel or inside the wind tunnel. One end of the rope 500 is connected to the base 110 (for example, wound around a rope wheel on the base 110). Generally, the upper end of the rope 500 is connected to the base 110, and the lower end hangs the test object 600. The weight of the test object 600 will form a tension on the rope 500, prompting the rope 500 to be taut.

[0053] The stopper 120 can be fixedly arranged on the base 110 and is near the rope 500. When the rope 500 extends vertically at this place, the two stoppers 120 are arranged at intervals in the up and down directions. When the rope 500 extends horizontally at this place, the two stoppers 120 are arranged at intervals in the left and right directions.

[0054] The cutter 130 can be controllably driven through a driving device. The driving device can be an electric device such as an actuator or an electric push rod, or a chemical device such as explosives. The driving device is used to accurately drive the cutter 130 to move quickly laterally to instantaneously cut off the rope 500.

[0055] This embodiment does not limit the material of the rope 500. The rope 500 can be made of metal material, nylon material, polymer material, etc., as long as it can be cut by the cutter 130. The rope 500 is threaded through the limiting hole 121, and the rope 500 is in clearance fit with the limiting hole 121. That is to say, the shape of the limiting hole 121 matches the cross-sectional shape of the rope 500 and is slightly larger than the rope 500. When the cross-section of the rope 500 is circular, the limiting hole 121 can be circular, and the aperture of the limiting hole 121 is slightly larger than the rope 500. In this way, when the cutter 130 cuts the rope 500, the hole wall of the limiting hole 121 can block the rope 500 to prevent or reduce the lateral movement and shaking of the rope 500, thereby reducing or avoiding interfering with the initial state of the test object 600 and reducing the disturbance of the test object 600, achieving the effect of improving the test accuracy. At the same time, by blocking the rope 500 through the limiting hole 121, the cutting time of the cutter 130 can also be shortened, that is, the full response time of the release device 100 is shortened, and the response speed of the release device 100 is improved. On the other hand, since the aperture of the limiting hole 121 is slightly larger than the rope 500, after the rope 500 is cut off, the hole wall of the limiting hole 121 will not generate too much frictional force on the lower rope 500, enabling the test object 600 to start free fall motion at the moment of being cut off. That is to say, the hole wall of the limiting hole 121 will not affect the time node, speed and acceleration of the free fall of the test object 600, thereby reducing the disturbance of the limiting hole 121 to the test object 600 and improving the test accuracy.

[0056] In the related art, connection and locking devices such as hooks and hanging rings are usually required to be provided at the lower end of the rope 500 to realize the connection between the rope 500 and the test object 600. The specifications and dimensions of the connection and locking devices are usually larger than the cross-sectional dimensions of the rope 500 body. When threading the rope 500 through the limiting hole 121, the connection and locking devices are usually removed first, passed through the limiting hole 121, and then the connection and locking devices are reconnected to the lower end of the rope 500. On the one hand, the above scheme has a relatively complex operation process. On the other hand, due to the small operation space at the experimental site and the harsh working conditions, it is possible that the connection reliability of the connection and locking devices cannot meet the experimental requirements during on-site installation. In this embodiment, one side of the hole wall of the limiting hole 121 is open to form a rope inlet groove 122. In this way, in the preparation stage, the rope 500 can be directly placed in the limiting hole 121 from the outside of the limiting hole 121 along the radial direction through the rope inlet groove 122, thereby reducing the experimental preparation time and improving the experimental efficiency.

[0057] In some embodiments of the release device of the present utility model, such as Figure 5As shown, the release device 100 further includes a driving device 140, which includes an actuator 141, a linear guide 142, and a tool holder 143. The actuator 141 is fixedly arranged on the base 110 and configured to controllably drive the cutter 130 to slide. The linear guide 142 is fixedly arranged on the base 110, and the cutter 130 is slidably connected to the linear guide along a straight line. The cutter 130 is fixedly connected to the tool holder 143. The tool holder 143 is slidably connected to the linear guide 142, and the tool holder 143 is fixedly connected to the telescopic end 141a of the actuator 141.

[0058] The actuator 141 is a device that can achieve active control of high-precision vibration / movement, and can provide precise load management and motion control. The actuator 141 may include a piezoelectric ceramic actuator, a piezoelectric thin film actuator, an electrostrictive actuator, a magnetostrictive actuator, a shape memory alloy actuator, a servo actuator, an electrorheological fluid actuator, etc. Specifically, the actuator 141 in this embodiment is a linear actuator. The telescopic end 141a of the actuator 141 is fixedly connected to the tool holder 143, and can drive the cutter 130 to cut along a straight line within a full response time of milliseconds.

[0059] The linear guide 142 may be a linear guide rail, a linear guide groove, etc., and is used to further limit the movement direction of the tool holder 143 and the cutter 130, so as to prompt the cutter 130 to cut the rope 500 in an accurate cutting direction.

[0060] In some embodiments of the release device of the present utility model, as Figure 5 shown, the test object 600 is suspended by a plurality of ropes 500. Each rope 500 corresponds to a set of limiters 120 and a cutter 130. A plurality of cutters 130 are all fixedly connected to the tool holder 143.

[0061] In this embodiment, the test object 600 is suspended by a plurality of ropes 500. For example, the test object 600 may be suspended by two ropes 500, and one is at the front end of the test object 600 and the other is at the rear end of the test object 600. In this way, by adjusting the length of the ropes 500, the up and down position, the front and rear tilt attitude, etc. of the test object 600 can be adjusted, so that the initial attitude of the test object 600 conforms to the preset attitude. Another example is that the test object 600 may be suspended by three ropes 500, so that the up and down position, the front and rear inclination angle, the left and right roll angle, etc. of the test object 600 can be adjusted.

[0062] In this embodiment, a set of limiters 120 are two spaced along the length direction of the same rope 500. Each rope 500 corresponds to a set of limiters 120 and a cutter 130. Multiple cutters 130 are all fixedly connected to the tool rest 143, that is to say, all cutters 130 are driven by an actuator 141. In this way, when the actuator 141 acts, all cutters 130 will cut the corresponding ropes 500 at the same time, ensuring that the test object 600 freely falls downward in a preset initial posture and ensuring that the test meets the expectations.

[0063] In some embodiments of the release device of the present utility model, the response time of the actuator 141 is less than or equal to 10 ms, and the repetition accuracy of the response time is less than or equal to 0.5 ms. In this way, the release device 100 can be applied to release tests with timely excitation (millisecond level) (such as hypersonic wind tunnels), and can cooperate with observation and measurement equipment to study the response of the test object 600 under excitation. The device has a repetition accuracy at the millisecond level and can also ensure the success of the release test under short-term excitation at the millisecond level.

[0064] In some embodiments of the release device of the present utility model, as Figures 1 - 2 shown, the base 110 is horizontally arranged and is provided with an avoidance hole 111 allowing the rope 500 to pass through. The release device 100 further includes a lifting mechanism 150, and the lifting mechanism 150 is fixedly arranged on the upper side of the base 110, and the rope 500 is connected to the lifting mechanism 150. The limiters 120 and the cutters 130 are both located on the lower side of the base 110.

[0065] In this embodiment, the lifting mechanism 150 can be a rope pulley, a winch, etc., and is used to tighten or scale the rope 500. By arranging the lifting mechanism 150 on the upper side of the base 110 and arranging the limiters 120 and the cutters 130 on the lower side of the base 110, the space can be effectively utilized, the volume of the release device 100 can be reduced, and it is convenient to apply it to wind tunnel equipment with smaller specifications and dimensions.

[0066] In some embodiments of the release device of the present utility model, the lifting mechanism 150, the limiters 120 and the cutters 130 are all adjustably installed on the base 110 to adjust the position of the rope 500, thereby adjusting the position and angle of the test object 600.

[0067] In some embodiments of the release device of the present utility model, as Figures 8 - 9 shown, the limiter 120 includes a limit seat 123 and a limit ring 124. The limit seat 123 is fixedly arranged on the base 110. A limit hole 121 is formed in the limit ring 124, and the limit ring 124 is hinged to the limit seat 123 along an axis parallel to the axial direction.

[0068] In this embodiment, the limiting seat 123 can be fixedly connected to the base 110 by means of welding, clamping, fastener connection, etc., so as to form a firm support for the limiting ring 124 and prevent the limiting ring 124 from moving or shaking. The limiting ring 124 is hinged to the limiting seat 123, so that the angle or direction of the rope inlet groove 122 can be freely changed. In the test preparation stage, the limiting ring 124 can be rotated first to make the rope inlet groove 122 face the rope 500, so as to facilitate the introduction of the rope 500 into the limiting hole 121 through the rope inlet groove 122. Then, the limiting ring 124 is rotated again to make the rope inlet groove 122 face the direction of the cutting knife 130, so as to prevent the rope 500 from disengaging from the limiting hole 121 in the direction of the rope inlet groove 122 when the cutting knife 130 cuts the rope 500.

[0069] In some embodiments of the release device of the present utility model, such as Figure 7 shown, a limiting block 125 is further provided on the limiting ring 124 to open or close the opening on the hole wall of the limiting hole 121. Figure 7 In, the dotted line part shows the state when the limiting block 125 opens the rope inlet groove 122.

[0070] The limiting block 125 can be hinged to the limiting ring 124 or can be covered on the limiting ring 124. In this way, in the test preparation stage, the limiting block 125 can be opened first to expose the rope inlet groove 122, so as to facilitate the introduction of the rope 500 into the limiting hole 121 through the rope inlet groove 122. Then, the limiting block 125 is closed to prevent the rope 500 from disengaging from the limiting hole 121 in the direction of the rope inlet groove 122 when the cutting knife 130 cuts the rope 500.

[0071] In some embodiments of the release device of the present utility model, such as Figure 10 shown, the distance L3 between the two limiters 120 is less than 1.2 times the thickness L2 of the cutting knife 130. In this way, the shear deformation of the rope 500 during the cutting process of the cutting knife 130 can be reduced, thereby shortening the cutting time of the cutting knife 130, that is, shortening the overall response time of the release device 100 and improving the response speed of the release device 100. In some preferred embodiments of the present utility model, the distance L3 between the two limiters 120 is less than 1.1 times the thickness L2 of the cutting knife 130, so as to further reduce the shear deformation of the rope 500 during the cutting process of the cutting knife 130, thereby shortening the cutting time of the cutting knife 130, that is, shortening the overall response time of the release device 100 and further improving the response speed of the release device 100.

[0072] In some embodiments of the release device of the present utility model, such as Figure 6 shown, the cutting knife 130 is slidably connected to the base 110 along a straight line. The included angle α between the cutting direction of the cutting knife 130 and the opening direction of the corresponding limiting hole 121 is 90-180 degrees. Figure 6In it, the cutting direction is to the right. The opening direction of the limiting hole 121 is the same as that of the rope inlet groove 122. When the cutter 130 cuts the rope 500, the rope 500 will move slightly to the right. By setting α to 90 - 180 degrees, it can prevent the rope 500 from disengaging from the rope inlet groove 122 when the cutter 130 cuts to the right, thereby affecting the response speed of the release device 100. In some preferred embodiments of the present utility model, the angle α between the cutting direction of the cutter 130 and the opening direction of the corresponding limiting hole 121 is 120 - 150 degrees. On the one hand, it reliably prevents the rope 500 from disengaging from the rope inlet groove 122 when the cutter 130 cuts to the right. On the other hand, it can also prevent the rope 500 from moving to the left and disengaging from the rope inlet groove 122 before the cutter 130 cuts.

[0073] In some embodiments of the release device of the present utility model, such as Figure 6 shown, the cutting edge of the cutter 130 is inclined, and the angle β with the cutting direction is 15 - 75 degrees.

[0074] In this embodiment, the cutting edge can be a straight line or an arc. When the cutting edge is an arc, the angle β between the direction of the cutting edge and the cutting direction is the angle between the tangent of the contact point of the cutting edge and the rope 500 and the cutting direction. By setting the cutting edge to be inclined, the contact surface between the rope 500 and the cutting edge can be increased, thereby improving the cutting effect.

[0075] In some embodiments of the release device of the present utility model, such as Figure 6 shown, the angle α between the cutting direction of the cutter 130 and the opening direction of the corresponding limiting hole 121 is 90 - 180 degrees, the angle β between the cutting edge and the cutting direction is 15 - 75 degrees, and the angle between the opening direction of the limiting hole 121 and the cutting edge is 70 - 110 degrees. In this way, during the process of the cutter 130 cutting the rope 500, the cutting edge is approximately perpendicular to the direction of the rope inlet groove 122, and the rope 500 will move or shake in a direction approximately opposite to that of the rope inlet groove 122, so as to avoid the rope 500 disengaging from the rope inlet groove 122 to the greatest extent.

[0076] In some embodiments of the release device of the present utility model, such as Figure 10 shown, the maximum distance L1 between the rope 500 and the hole wall of the limiting hole 121 is less than or equal to 1 mm. The rope 500 is in clearance fit with the limiting hole 121, and the maximum distance L1 is less than or equal to 1 mm. In this way, the maximum distance of the lateral movement and shaking of the rope 500 can be limited to 1 mm, reducing or avoiding interfering with the initial state of the test object 600 and reducing the disturbance of the test object 600, achieving the effect of improving the test accuracy.

[0077] In some embodiments of the release device of the present utility model, such as Figure 4 and Figure 10As shown in the figure, a cutter hole 126 allowing the cutter 130 to pass through is provided on the limit seat 123. By providing the cutter hole 126, on the one hand, it can prevent the cutter 130 from cutting the limit seat 123, resulting in damage to the cutting edge. On the other hand, the cutting speed of the cutter 130 is relatively fast. The provision of the cutter hole 126 can extend the deceleration time of the cutter 130, so that the cutter 130 and the tool holder 143 decelerate and stop with a relatively small acceleration, thereby reducing the impact on the actuator 141 and improving the service life of the actuator 141.

[0078] In some embodiments of the wind tunnel test system of the present invention, as Figures 11 - 12 shown, the wind tunnel test system includes a controller 200, a collector 300 for obtaining the state of the test object 600, and the release device 100 of any one of the above embodiments or a combination of embodiments. The controller 200 is provided with a synchronizer 210, and the synchronizer 210 is signal-connected to both the release device 100 and the collector 300. The wind tunnel test system can adopt the following control method:

[0079] S111, obtain a start command;

[0080] S112, according to the start command, the synchronizer 210 simultaneously sends a release signal to the release device 100 and a collection signal to the collector 300;

[0081] S113, the release device 100 cuts the rope 500 according to the release signal;

[0082] S114, the collector 300 obtains the state data of the test object 600 according to the collection signal;

[0083] S115, analyze and process the state data through the computer 400.

[0084] In this embodiment, the wind tunnel test system can preset a start time and issue a start command according to the start time. It can also preset a trigger program and trigger a start command according to the trigger program. For example, a sensor can be set at a preset position in the wind tunnel. When the sensor obtains a preset high-speed air flow, it will automatically trigger a start command.

[0085] The collector 300 may include a high-speed camera, a high-frequency sensor, etc., and can capture images, record videos and make measurements on the release device 100, the rope 500 and the test article. The high-frequency sensor may include a ranging device, a speed measuring device, an acceleration measuring device, a pressure measuring device, a temperature measuring device, etc. The high-frequency sensor may be disposed on the test object 600 or in the wind tunnel, and there is no requirement here. In this embodiment, the synchronizer 210 is used to establish time synchronization. Specifically, the trigger interface of the collector 300 is connected to the trigger interface of the release device 100 through the synchronizer 210. After the synchronizer 210 sends a signal, the release device 100 and the collector 300 work simultaneously to ensure that the release action and the collection action are precisely synchronized in time. The synchronizer 210 may be connected to the collector 300 and the release device 100 in forms such as electrical connection and wireless connection.

[0086] Up to this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A low-disturbance and high-response-speed release device, characterized in that, Comprising: A base, to which a rope for suspending a test object is connected; A limiter, the limiter being provided with a limiting hole, the rope passing through the limiting hole, and the rope being in clearance fit with the limiting hole; one side of the hole wall of the limiting hole is open to allow the rope to enter the limiting hole in the radial direction; there are two limiters, which are arranged at intervals along the length direction of the rope; A cutter, the cutter being located between the two limiters; the cutter is configured to be slidably connected to the base controllably in a plane perpendicular to the length direction of the rope.

2. The release device according to claim 1, characterized in that The release device further includes a driving device, and the driving device includes: An actuator, fixedly arranged on the base, configured to controllably drive the cutter to slide; A linear guide, fixedly arranged on the base, the cutter being slidably connected to the linear guide along a straight line; A tool holder, the cutter being fixedly connected to the tool holder; the tool holder is slidably connected to the linear guide, and the tool holder is fixedly connected to the telescopic end of the actuator.

3. The release device according to claim 2, wherein, The test object is suspended by a plurality of the ropes; each rope corresponds to a set of limiters and a cutter; A plurality of the cutters are all fixedly connected to the tool holder.

4. The release device according to claim 2, characterized in that The response time of the actuator is less than or equal to 10 ms, and the repetition accuracy of the response time is less than or equal to 0.5 ms.

5. The release device according to claim 1, wherein The base is horizontally arranged and is provided with an avoidance hole allowing the rope to pass through; The release device further includes a lifting mechanism, the lifting mechanism being fixedly arranged on the upper side of the base, and the rope is connected to the lifting mechanism; Both the limiter and the cutter are located on the lower side of the base.

6. The release device according to claim 1, characterized in that The limiter includes a limit seat and a limit ring; the limit seat is fixedly arranged on the base; the limit hole is formed inside the limit ring, and the limit ring is hinged to the limit seat along an axis parallel to the axial direction; The limit ring is further provided with a limit block to open or close the opening of the hole wall of the limit hole.

7. The release device according to claim 1, wherein The distance between the two limiters is less than 1.2 times the thickness of the cutter.

8. The release device according to claim 1, wherein The cutter is slidably connected to the base along a straight line; The included angle between the cutting direction of the cutter and the opening direction of the corresponding limiting hole is 90 - 180 degrees.

9. The release device according to claim 8, wherein The cutting edge of the cutter is inclined, and the included angle with the cutting direction is 15 - 75 degrees.

10. A wind tunnel test system, characterized in that, Comprising a controller, a collector for acquiring the state of the test object, and a release device according to any one of claims 1 - 9, wherein the controller is provided with a synchronizer, and the synchronizer is in signal connection with both the release device and the collector.

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