CN107764506B - Impact-resistant device and method applied to balance in temporary impact type wind tunnel - Google Patents
Impact-resistant device and method applied to balance in temporary impact type wind tunnel Download PDFInfo
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- CN107764506B CN107764506B CN201711136599.1A CN201711136599A CN107764506B CN 107764506 B CN107764506 B CN 107764506B CN 201711136599 A CN201711136599 A CN 201711136599A CN 107764506 B CN107764506 B CN 107764506B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 210000000078 claw Anatomy 0.000 claims abstract description 65
- 230000007246 mechanism Effects 0.000 claims abstract description 63
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 13
- 230000002829 reductive effect Effects 0.000 claims abstract description 9
- 229910000639 Spring steel Inorganic materials 0.000 claims description 16
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000000670 limiting effect Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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Abstract
The invention discloses an impact-resistant device applied to a balance in a temporary impact wind tunnel, which comprises a power mechanism and a support rod capable of being connected with the balance, wherein an ejection claw can extend out of the support rod and tightly support the inner wall of a tail cavity of a model under the drive of the power mechanism, a contact fulcrum is formed between the inner cavity of the tail of the model and the support rod, the displacement of the tail of the model is limited by the contact fulcrum, the transmission of force is realized, the support rod is used for replacing the balance to share the impact load, the overload peak value of the balance is reduced, and therefore, the purposes of protecting the balance and improving the safety and the reliability of wind tunnel tests are achieved. The invention also provides an impact resistance method applied to the balance in the temporary impact type wind tunnel, and the model is fixedly connected with the supporting rod and the ejection mechanism in the starting and closing processes and the experimental processes of the wind tunnel, so that the peak value of the impact load actually applied to the balance is reduced, and the safety of test equipment is protected.
Description
Technical Field
The invention relates to the technical field of aerospace wind tunnel test control, in particular to an impact resistance device and method applied to a balance in a temporary impact wind tunnel.
Background
Wind tunnel experiments in fluid mechanics refer to an aerodynamic experimental method of arranging an aircraft or other object model in a wind tunnel, and researching gas flow and interaction with the model to know the aerodynamic characteristics of an actual aircraft or other object. According to the relativity principle of movement, the model or the real object of the aircraft is fixed in the ground artificial environment, and air flow is manufactured artificially, so that various complex flight states in the air are simulated, and test data are obtained.
In the temporary impact type high-speed wind tunnel force measurement test, in the process of starting and shutting down the wind tunnel, the impact load of disturbance air flow and shock waves passing through the moment before and after the flow field is formed can exceed the balance measuring range by several times or even by more than ten times, thereby adversely affecting the measuring precision and stability of balance equipment and even threatening the safety of the test equipment when serious. Impact load suppression currently includes model launch techniques, deceleration and start techniques, temporary isolation of the model from the airflow using shields or shields, and the like. The implementation of the throwing technology and the protective cover isolation technology on the test model with large aspect ratio is very difficult, and if different technical reforms are carried out on the throwing test section according to different model characteristics, the throwing cost is very high; the effect of the reduced pressure start on the impact load reduction is limited by the minimum total pressure required for flow field establishment. The technical scheme is that a removable flexible support is used to enable the tail part of the model to be connected with the supporting rod so as to be capable of absorbing part of impact load energy through the air bag, but the air cushion can accelerate the convergence of vibration and can not greatly reduce the peak value of the impact load born by the balance due to the small deformation amount and short action time of the balance element under load, so that the load impact resistance of the balance is still quite unsatisfactory.
Therefore, how to solve the problem of non-ideal horizontal impact resistance in the temporary impact wind tunnel in the prior art is a urgent need for those skilled in the art.
Disclosure of Invention
The invention aims to provide an impact-resistant device and an impact-resistant method applied to a balance in a temporary-flushing wind tunnel, so as to solve the problems in the prior art, relieve unexpected shaking phenomenon generated by the excitation of airflow on a model when the temporary-flushing wind tunnel is started to be closed, and improve the horizontal impact-resistant capability in the temporary-flushing wind tunnel and the safety and reliability of a wind tunnel test.
In order to achieve the above object, the present invention provides the following solutions: the invention provides an impact-resistant device applied to a balance in a temporary impact wind tunnel, which comprises a power mechanism and a support rod capable of being connected with the balance, wherein the support rod is of a hollow structure, an ejection mechanism is arranged in an inner cavity of the support rod, and the ejection mechanism is in transmission connection with the power mechanism;
the ejection mechanism comprises at least two ejection claws, the support rod is provided with a sliding groove, the ejection claws are in sliding connection with the sliding groove, and the ejection claws can extend out of the support rod and tightly support the inner wall of the tail cavity of the model under the drive of the power mechanism.
Preferably, the ejection mechanism further comprises a screw rod and an inclined surface driving nut matched with the screw rod, the screw rod is in threaded connection with the inclined surface driving nut, the inclined surface driving nut is provided with an inclined surface part, one end of the ejection claw is abutted to the inclined surface part, the other end of the ejection claw stretches into the sliding groove, and the screw rod is in transmission connection with the power mechanism.
Preferably, the impact-resistant device applied to the balance in the temporary impact wind tunnel further comprises a fixed support, the fixed support is sleeved in the inner cavity of the supporting rod, the fixed support is of a hollow structure, the inclined surface driving nut and the screw rod are arranged in the inner cavity of the fixed support, and the top claw penetrates through the fixed support and is in sliding connection with the sliding groove.
Preferably, one end of the screw rod, which is close to the power mechanism, is additionally provided with a deep groove ball bearing and is fixed by a bearing retainer ring, the other end of the screw rod is additionally provided with a thrust bearing and is compressed by a compression nut, and the compression nut is in threaded connection with the fixed support.
Preferably, the number of the top claws is four, the four top claws are uniformly distributed in a circumferential shape, the axis of each top claw is perpendicular to the axis of the screw rod, and the cross section of each top claw is rectangular.
Preferably, a spring steel wire is arranged on the outer wall of the supporting rod and is pressed by a spring steel wire pressing plate, and the position of the spring steel wire is matched with the position of the sliding groove.
Preferably, the power mechanism comprises a motor, a speed reducer and a transmission rod which are sequentially connected, and the transmission rod is connected with the screw rod through a universal joint.
Preferably, the shock resistance device applied to the balance in the temporary flushing wind tunnel further comprises a bracket center shaft and a sheath pipe, wherein the bracket center shaft is sleeved outside the sheath pipe, the sheath pipe is sleeved outside the transmission rod, a bearing is additionally arranged between the sheath pipe and the transmission rod, and the bracket center shaft is in plug-in connection with the supporting rod.
Preferably, one end of the supporting rod connected with the balance is provided with a conical hole matched with the balance.
The invention also provides an impact resistance method applied to the balance in the temporary impact wind tunnel, which comprises the following steps:
step one, before a wind tunnel is started, a top claw of an ejection mechanism extends out until contacting with a prefabricated position of an inner cavity of a model, and the model is tightly ejected;
step two, in the process of establishing the flow field, the ejection mechanism and the support rod replace a balance to share part of impact load; after the flow field is established, the ejection mechanism acts reversely, the ejection claw is separated from the inner cavity of the model, and the model and the balance are in a normal connection state;
step three, after the test is completed, the model is connected with the ejection mechanism and the supporting rod again to form a whole; in the closing process of the wind tunnel, the ejection mechanism and the support rod replace a balance to bear part of impact load;
and fourthly, after the airflow in the wind tunnel is reduced to a normal pressure stable state, the top claw is separated from the inner cavity of the model again, and the model and the balance return to a normal connected free state.
Compared with the prior art, the invention has the following technical effects: the invention relates to an impact resistance device applied to a balance in a temporary impact wind tunnel, which comprises a power mechanism and a supporting rod capable of being connected with the balance, wherein an ejection claw can extend out of the supporting rod and tightly support the inner wall of a tail cavity of a model under the drive of the power mechanism, a contact fulcrum is formed between the inner cavity of the tail of the model and the supporting rod, the contact fulcrum is used for limiting the displacement of the tail of the model and realizing the force transmission, so that the supporting rod replaces the balance to share the impact load, the overload peak value of the balance is reduced, and the purposes of protecting the balance and improving the safety reliability of wind tunnel tests are achieved. The invention also provides an impact resistance method applied to the balance in the temporary impact type wind tunnel, and the model is fixedly connected with the supporting rod and the ejection mechanism in the starting and closing processes and the experimental processes of the wind tunnel, so that the peak value of the impact load actually applied to the balance is reduced, and the safety of test equipment is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the entire cross-section of an impact resistant device of the invention applied to a balance in a temporary impact wind tunnel;
FIG. 2 is an enlarged cross-sectional schematic view of a strut and ejector mechanism of the impact device of the present invention applied to a balance in a temporary impact wind tunnel;
wherein, 1 is a power mechanism, 101 is a motor and a speed reducer, 102 is a transmission rod, 103 is a universal joint, 2 is a balance, 3 is a supporting rod, 301 is a sliding groove, 4 is an ejection mechanism, 401 is a top claw, 402 is a lead screw, 403 is an inclined surface driving nut, 404 is a bearing retainer ring, 405 is a lead screw locking nut, 406 is a compression nut, 5 is a fixed support, 6 is a spring steel wire, 7 is a spring steel wire pressing plate, 8 is a bracket central shaft, and 9 is a sheath tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an impact-resistant device and an impact-resistant method applied to a balance in a temporary-flushing wind tunnel, so as to solve the problems in the prior art, relieve unexpected shaking phenomenon generated by the excitation of airflow on a model when the temporary-flushing wind tunnel is started to be closed, and improve the horizontal impact-resistant capability in the temporary-flushing wind tunnel and the safety and reliability of a wind tunnel test.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1 and 2, fig. 1 is a schematic view of an overall cut-away structure of an impact-resistant device applied to a balance in a temporary impact wind tunnel according to the present invention, and fig. 2 is a schematic view of an enlarged cut-away structure of a strut and an ejector mechanism of the impact-resistant device applied to a balance in a temporary impact wind tunnel according to the present invention.
The invention provides an impact-resistant device applied to a balance in a temporary impact wind tunnel, which comprises a power mechanism 1 and a support rod 3 capable of being connected with the balance 2, wherein the support rod 3 is of a hollow structure, an ejection mechanism 4 is arranged in an inner cavity of the support rod 3, and the ejection mechanism 4 is in transmission connection with the power mechanism 1.
The ejection mechanism 4 comprises at least two ejection claws 401, the support rod 3 is provided with a sliding groove 301, the ejection claws 401 are slidably connected with the sliding groove 301, and the ejection claws 401 can extend out of the support rod 3 and tightly support the inner wall of the tail cavity of the model under the drive of the power mechanism 1.
The top claw 401 can extend out of the support rod 3 and tightly support the inner wall of the tail cavity of the model under the drive of the power mechanism 1, a contact fulcrum is formed between the inner cavity of the tail of the model and the support rod 3, the displacement of the tail of the model is limited by the contact fulcrum, the force transmission is realized, the support rod 3 replaces the balance 2 to share the impact load, and the overload peak value of the balance 2 is reduced, so that the purposes of protecting the balance 2 and improving the safety and the reliability of wind tunnel test are achieved.
Specifically, the ejection mechanism 4 further includes a lead screw 402 and a bevel drive nut 403 matched with the lead screw 402, the lead screw 402 is in threaded connection with the bevel drive nut 403, the bevel drive nut 403 has a bevel portion, one end of the top claw 401 abuts against the bevel portion, the other end of the top claw 401 extends into the sliding groove 301, and the lead screw 402 is in transmission connection with the power mechanism 1. The power mechanism 1 drives the screw rod 402 to rotate, the screw rod 402 rotates to drive the inclined surface driving nut 403 to move left and right along the screw rod 402, and the top claw 401 is pushed to slide along the sliding groove 301 in the moving process of the inclined surface driving nut 403; as shown in fig. 2, when the bevel drive nut 403 moves rightward, the top claw 401 moves upward along the sliding groove 301 to extend out of the strut 3 and against the inner wall of the mold; when the inclined surface driving nut 403 moves leftwards, the top claw 401 moves downwards along the sliding groove 301 and is separated from the inner wall of the model, in order to avoid that the inclined surface driving nut 403 is separated from the top claw 401 to cause the ejection mechanism 4 to fail, a stop block is arranged at one end of the smaller diameter of the inclined surface driving nut 403 and is matched with the top claw 401, the limiting position of the movement of the inclined surface driving nut 403 is limited, meanwhile, a limiting ring is arranged at the other end of the inclined surface driving nut 403, and the movement stroke of the inclined surface driving nut 403 is limited by matching the stop block.
In addition, the impact-resistant device applied to the balance in the temporary impact wind tunnel further comprises a fixed support 5, the fixed support 5 is sleeved in the inner cavity of the supporting rod 3, the fixed support 5 is of a hollow structure, the inclined surface driving nut 403 and the screw 402 are arranged in the inner cavity of the fixed support 5, and the top claw 401 penetrates through the fixed support 5 and is in sliding connection with the sliding groove 301. The fixed support 5 provides support for the screw 402, and simultaneously limits the movement track of the inclined plane drive nut 403, so that the inclined plane drive nut 403 is prevented from being greatly displaced in the radial direction of the support rod 3, and the normal work of the impact-resistant device is prevented from being influenced.
More specifically, a deep groove ball bearing is additionally arranged at one end of the screw 402, which is close to the power mechanism 1, and is fixed by a bearing retainer ring 404, a thrust bearing is additionally arranged at the other end of the screw 402, a screw locking nut 405 and a compression nut 406 are additionally arranged to be matched, the thrust bearing is fixed, the screw locking nut 405 is in threaded connection with the screw 402, and the compression nut 406 is in threaded connection with the fixed support 5.
In this embodiment, the number of top claws 401 is four, four top claws 401 are uniformly distributed in a circumferential shape, the axis of the top claw 401 is perpendicular to the axis of the screw rod 402, when the four top claws 401 extend out of the supporting rod 3, the top claws 401 are guaranteed to tightly prop the inner wall of the model, the supporting rod 3 is fixedly connected with the balance 2, and the number and the position of the guide grooves 301 are matched with the top claws 401. The cross section of the top claw 401 is rectangular, so that rotation in the movement process of the top claw 401 is prevented, and the stability of the device is improved.
In order to prevent the top claw 401 from being unable to reset after extending out, a spring steel wire 6 is arranged on the outer wall of the supporting rod 3 and is pressed by a spring steel wire pressing plate 7, and the position of the spring steel wire 6 is matched with the position of the sliding groove 301. The power mechanism 1 comprises a motor, a speed reducer 101 and a transmission rod 102 which are sequentially connected, wherein the transmission rod 102 is connected with a lead screw 402 through a universal joint 103. Because the transmission distance is longer, the universal joint 103 is adopted to connect the transmission rod 102 and the screw rod 402, the phenomenon that transmission work cannot be completed due to long transmission axis and deflection of transmission angle is avoided, and the overall reliability of the device is improved.
When the ejection mechanism 4 is required to jack up the inner cavity of the model, the driving mechanism 1 rotates forward to drive the screw rod 402 to rotate forward, the screw rod 402 drives the inclined surface driving nut 403 to move leftwards, four ejection claws 401 which are 90 degrees each other are pushed by inclined surfaces to extend outwards from the support rod 3 along the axis of the guide groove 301, and meanwhile, the spring steel wire 6 is pressed to bend and deform; after the top claw 401 extends out of the supporting rod 3 and contacts the inner cavity of the model, the transmission rod 102 cannot continue to rotate, the motor and the speed reducer 101 enter a moment maintaining state or a band-type brake locking state, at the moment, the inner cavity of the tail of the model is rigidly connected with the supporting rod 3 through the top claw 401, the displacement of the model is limited, and a part of load born by the model is transmitted to the supporting rod 3 through the top claw 401. During the reverse release action, the motor and the speed reducer 101 reversely rotate to drive the transmission rod 4 to reversely rotate, the transmission rod 4 drives the universal joint 103 and the lead screw 402 to reversely rotate, the lead screw 402 drives the inclined surface driving nut 403 to move rightwards, the bottom end surface of the top claw 401 is no longer pushed by the inclined surface of the inclined surface driving nut 403, the spring steel wire 6 returns by virtue of elasticity, so that the top claw 401 rebounds, the bottom end surface of the top claw 401 keeps sliding friction with the inclined surface of the inclined surface driving nut 403 and gradually retracts into the supporting rod 3 along the axis of the guide groove 301; the transmission rod 102 cannot continue to rotate after the inclined surface driving nut 403 moves to the right to the limiting ring, the motor and the speed reducer 101 enter a moment holding state or a band-type brake locking state, at the moment, a sufficient gap is reserved between the inner cavity of the tail part of the model and the outer end of the top claw 401, the model is only rigidly connected with the measuring end of the balance 2 when the model is subjected to load, and all the load of the model is borne by the balance 2.
Further, the impact-resistant device applied to the balance in the temporary impact wind tunnel further comprises a bracket center shaft 8 and a sheath tube 9, wherein the bracket center shaft 8 is sleeved outside the sheath tube 9, the sheath tube 9 is sleeved outside the transmission rod 102, a bearing is additionally arranged between the sheath tube 9 and the transmission rod 102, and the bracket center shaft 8 is in plug-in connection with the support rod 3. The bracket center shaft 8 and the sheath tube 9 provide support for the transmission rod 102, and the transmission rod 102 is connected with the motor and the speed reducer 101 through the adapter.
Furthermore, one end of the supporting rod 3 connected with the balance 2 is provided with a conical hole matched with the balance 2, so that the supporting rod 3 is more convenient to connect with the balance 2, and the test efficiency is improved. In addition, for models with different tail cavity diameters, only the parts which are in contact with the support are needed to be replaced, so that the machining amount is small; for wind tunnel tests without an impact resistance device, the disassembly is convenient, and the time is saved; the structural arrangement of the invention enables the power mechanism 1 to be far away from the measuring element and the signal wire, and minimizes the interference of the power mechanism 1 on the measuring signal.
The invention also provides an impact resistance method applied to the balance in the temporary impact wind tunnel, which comprises the following steps:
before the wind tunnel is started, the ejector claw 401 of the ejector mechanism 4 extends until contacting with the prefabricated position of the inner cavity of the model and pushing up the model, and rigid constraint is added between the model and the balance 2 and the support rod 3 to limit the balance to elastically deform;
step two, in the process of establishing a flow field, the ejection mechanism 4 and the support rod 3 replace the balance 2 to share part of impact load; after the flow field is established, the ejection mechanism 4 acts reversely, the ejection claw 401 is separated from the inner cavity of the model, and the model and the balance 2 are in a normal connection state;
step three, after the test is completed, the model is connected with the ejection mechanism 4 and the supporting rod 3 again to form a whole; in the closing process of the wind tunnel, the ejection mechanism 4 and the support rod 3 replace the balance 2 to bear part of impact load;
and step four, after the airflow in the wind tunnel is reduced to a normal pressure stable state, the top claw 401 is separated from the inner cavity of the model again, the model and the balance 2 return to a normal connected free state, and all loads of the model are borne by the balance 2.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. An impact resistance device applied to a balance in a temporary impact wind tunnel is characterized in that: the device comprises a power mechanism and a supporting rod capable of being connected with a balance, wherein the supporting rod is of a hollow structure, an ejection mechanism is arranged in an inner cavity of the supporting rod, and the ejection mechanism is in transmission connection with the power mechanism;
the ejection mechanism comprises at least two ejection claws, the support rod is provided with a sliding groove, the ejection claws are in sliding connection with the sliding groove, and the ejection claws can extend out of the support rod and tightly support the inner wall of the tail cavity of the model under the drive of the power mechanism;
the ejection mechanism further comprises a screw rod and an inclined surface driving nut matched with the screw rod, the screw rod is in threaded connection with the inclined surface driving nut, the inclined surface driving nut is provided with an inclined surface part, one end of the ejection claw is abutted against the inclined surface part, the other end of the ejection claw stretches into the sliding groove, and the screw rod is in transmission connection with the power mechanism; a stop block is arranged at one end of the inclined plane driving nut with a smaller diameter, and a limiting ring is arranged at the other end of the inclined plane driving nut so as to limit the limiting position of the movement of the inclined plane driving nut;
the outer wall of the supporting rod is provided with a spring steel wire and is pressed by a spring steel wire pressing plate, and the position of the spring steel wire is matched with the position of the sliding groove; the driving mechanism rotates forward to drive the lead screw to rotate forward, the lead screw drives the inclined surface driving nut to move leftwards, four top claws which are 90 degrees each other are pushed by inclined surfaces to extend out of the supporting rod along the axis of the sliding groove, and meanwhile the spring steel wire is pressed to bend and deform; when the reverse release action is performed, the screw rod reversely rotates, the screw rod drives the inclined surface driving nut to move rightwards, the bottom end surface of the top claw is not pushed by the inclined surface of the inclined surface driving nut any more, the spring steel wire returns to enable the top claw to rebound by virtue of elastic reset of the spring steel wire, and the bottom end surface of the top claw keeps sliding friction with the inclined surface of the inclined surface driving nut and gradually retracts into the supporting rod along the axis of the sliding groove;
the fixed support is sleeved in the inner cavity of the supporting rod, the fixed support is of a hollow structure, the inclined plane driving nut and the lead screw are arranged in the inner cavity of the fixed support, and the top claw penetrates through the fixed support and is in sliding connection with the sliding groove; the screw rod is close to one end of the power mechanism and is additionally provided with a deep groove ball bearing and fixed by a bearing retainer ring, the other end of the screw rod is additionally provided with a thrust bearing and is tightly pressed by a compression nut, and the compression nut is in threaded connection with the fixed support.
2. The impact resistance device applied to a balance in a temporary impact wind tunnel according to claim 1, wherein: the number of the top claws is four, the four top claws are uniformly distributed in a circumferential shape, the axis of each top claw is perpendicular to the axis of the screw rod, and the cross section of each top claw is rectangular.
3. The impact resistance device applied to a balance in a temporary impact wind tunnel according to claim 1, wherein: the power mechanism comprises a motor, a speed reducer and a transmission rod which are sequentially connected, and the transmission rod is connected with the screw rod through a universal joint.
4. An impact resistance device for a balance in a temporary impact wind tunnel according to claim 3, wherein: the novel transmission device is characterized by further comprising a bracket center shaft and a protective sleeve, wherein the bracket center shaft is sleeved outside the protective sleeve, the protective sleeve is sleeved outside the transmission rod, a bearing is additionally arranged between the protective sleeve and the transmission rod, and the bracket center shaft is in plug-in connection with the supporting rod.
5. The impact resistance device applied to a balance in a temporary impact wind tunnel according to claim 1, wherein: one end of the supporting rod connected with the balance is provided with a conical hole matched with the balance.
6. An impact resistance method applied to a balance in a temporary impact wind tunnel, which is characterized by comprising the following steps of:
step one, before a wind tunnel is started, a top claw of an ejection mechanism extends out until contacting with a prefabricated position of an inner cavity of a model, and the model is tightly ejected;
step two, in the process of establishing the flow field, the ejection mechanism and the support rod replace a balance to share part of impact load; after the flow field is established, the ejection mechanism acts reversely, the ejection claw is separated from the inner cavity of the model, and the model and the balance are in a normal connection state;
step three, after the test is completed, the model is connected with the ejection mechanism and the supporting rod again to form a whole; in the closing process of the wind tunnel, the ejection mechanism and the support rod replace a balance to bear part of impact load;
and fourthly, after the airflow in the wind tunnel is reduced to a normal pressure stable state, the top claw is separated from the inner cavity of the model again, and the model and the balance return to a normal connected free state.
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| CN201711136599.1A CN107764506B (en) | 2017-11-16 | 2017-11-16 | Impact-resistant device and method applied to balance in temporary impact type wind tunnel |
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| CN201711136599.1A CN107764506B (en) | 2017-11-16 | 2017-11-16 | Impact-resistant device and method applied to balance in temporary impact type wind tunnel |
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| CN107764506B true CN107764506B (en) | 2024-03-22 |
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| CN108760220B (en) * | 2018-05-28 | 2024-03-26 | 中国航空工业集团公司沈阳空气动力研究所 | External balance tailstock supporting device for measuring six-degree-of-freedom mechanism interference |
| CN112268676B (en) * | 2020-10-15 | 2022-04-26 | 中国空气动力研究与发展中心高速空气动力研究所 | Supersonic wind tunnel model pitching motion protection device |
| CN113820092A (en) * | 2021-10-15 | 2021-12-21 | 中国航空工业集团公司沈阳空气动力研究所 | Impact load resistance test device for force measurement test |
| CN116593120B (en) * | 2023-06-21 | 2024-01-26 | 中国航空工业集团公司沈阳空气动力研究所 | Hypersonic wind tunnel engine thrust resistance measuring device and measuring method |
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