CN112340056B - Free boundary simulation support module - Google Patents
Free boundary simulation support module Download PDFInfo
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- CN112340056B CN112340056B CN202011001837.XA CN202011001837A CN112340056B CN 112340056 B CN112340056 B CN 112340056B CN 202011001837 A CN202011001837 A CN 202011001837A CN 112340056 B CN112340056 B CN 112340056B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a free boundary simulation support module which comprises an end plate assembly, a lifting mechanism assembly, a flexible support assembly and a control assembly; the end plate assembly comprises an upper end plate and a lower end plate, the lower end plate is used for fixing the free boundary simulation support module, and the upper end plate is used for connecting a test product; the lifting mechanism assembly comprises a driving motor, a transmission shaft, a gear steering gear, a lead screw and an upright post; and a flexible supporting component is arranged in a space enclosed by the upper end plate, the lower end plate and the plurality of stand columns. The supporting module adopts the lifting mechanism assembly to realize the lifting of a test product before and after a test, and adopts the flexible supporting assembly to support the test product in the test process, so that on one hand, the free boundary simulation required by a modal test is realized, and on the other hand, the problems that the lifting safety of the flexible supporting assembly is poor, the multiple flexible supporting floating processes are coupled, the control method is complex and the like are solved by adopting the synchronous lifting of a mechanical structure.
Description
Technical Field
The invention relates to a free boundary simulation support module, and belongs to the field of modal analysis.
Background
Modal analysis techniques have been widely used in a number of engineering fields as an important tool to improve structural dynamic characteristics, vibration and noise control, and fault diagnosis. In the modal test, the simulation of the boundary condition of a test product is a key factor for accurately acquiring modal parameters, and in the aerospace field, the working state of many test products in the air is in a free boundary state, so the modal test of the structure requires the realization of the free boundary simulation. To achieve a completely free boundary constraint state, it is generally impossible to achieve this, so soft supports, such as rubber rope suspensions, spring suspensions, air bags or air spring supports, etc., are usually used in the tests to reduce the influence of the stiffness of the boundary support as much as possible.
When flexible mechanisms such as rubber ropes or springs are adopted for suspension, extra bearing support frames are usually needed, the universality of large-scale products and even vibrating towers with special structures need to be built, and the realization cost is high. In recent years, researchers gradually use flexible supports to replace flexible suspensions, including airbag supports, air spring supports and the like, the current flexible support schemes all require that an airbag or an air spring stably and freely float a test product to a certain height and stably support the test product, and therefore the purpose of free boundary simulation is achieved.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects and requirements in the prior art, the invention provides a free boundary simulation support module, which adopts a lifting mechanism assembly to realize the lifting of a test product before and after a test, adopts a flexible support assembly to support the test product in the test process, on one hand, the free boundary simulation required by a modal test is realized, and on the other hand, the problems of poor lifting safety of the conventional flexible support assembly, coupling in the multi-flexible support floating process, complex control method and the like are solved by adopting the synchronous lifting of a mechanical structure. The free boundary simulation support module improves the stability and reliability of the flexible support, has strong universality as a modularized product, and is suitable for combined use.
(II) technical scheme
A free boundary simulation support module is characterized by comprising an end plate assembly, a lifting mechanism assembly, a flexible support assembly and a control assembly; the end plate assembly comprises an upper end plate and a lower end plate, the lower end plate is used for fixing the free boundary simulation support module, and the upper end plate is used for connecting a test product; the lifting mechanism assembly comprises a driving motor, a transmission shaft, a gear steering gear, a lead screw and an upright post; the plurality of upright columns are fixedly arranged on the lower end plate, the upright columns are connected to the lower end surface of the upper end plate through respective screw rods, a driving motor is arranged between two adjacent upright columns, two output ends of the driving motor transmit power to gear steering gears on the corresponding upright columns through corresponding transmission shafts, and the gear steering gears are communicated to the insides of the corresponding upright columns and are in transmission connection with the corresponding screw rods; a transmission shaft and a gear steering gear are arranged between every two adjacent upright columns to obtain the power of a driving motor, and the synchronous lifting of corresponding screw rods on the upright columns is realized to realize the lifting action of an upper end plate, wherein the upper ends of the screw rods and the upright columns are not fixedly connected with the upper end plate; and a flexible supporting component is arranged in a space enclosed by the upper end plate, the lower end plate and the plurality of stand columns.
The flexible supporting component comprises an air bag, an additional air chamber, a connecting air pipe and a throttling regulator; the upper end of the air bag is connected with the lower end face of the upper end plate, the air bag is arranged above the additional air chamber, the air bag is communicated with the additional air chamber through the connecting air pipe, the throttling regulator is arranged on the connecting air pipe, and on-off control of the air bag and the additional air chamber can be realized.
The flexible supporting components are arranged into a plurality of parts and are uniformly distributed.
The control assembly includes respective sensors and a controller.
The sensor comprises a force sensor; the force sensor is arranged between the upright post and the upper end plate and used for measuring the contact force between the upright post and the upper end plate.
The end plate assembly has sufficient strength and rigidity to ensure its load carrying capacity.
In the lifting mechanism assembly, a driving motor is used for providing power for the lifting mechanism assembly; the transmission shaft is used for connecting the driving motor and the lead screw; the gear steering gear is used for changing the driving rotation direction of the transmission shaft, so that the up-and-down operation of the screw rod is realized; the screw rod is used for realizing the lifting function and completing the lifting or descending of the upper end plate; the stand is used for fixing the lead screw and supporting a test product before the test starts or after the test ends.
In the flexible supporting component, the air bag is used for providing support for a test product in the modal test process so as to simulate the free-free boundary state of the test product; the additional air chamber is used for expanding the volume of the air bag and reducing the supporting frequency of the system; the connecting air pipe is used for connecting the air bag and the additional air chamber; the throttling regulator is arranged on the connecting air pipe and used for switching on and off the air bag and the additional air chamber, and can realize the adjustment of throttling damping.
The control assembly is used for overall control of the free boundary simulation support module, so that a test product can be stably suspended on the flexible support assembly before the test is started and can stably fall back to the support upright post after the test is finished, and the safety and reliability of the overall system are guaranteed.
A method for using a free boundary simulation support module comprises the following steps:
s1, before a test is started, a test product is fixed on an upper end plate and supported by a stand column, and at the moment, a flexible supporting component is not inflated;
s2, during test preparation, according to the height of a test product, a control assembly controls a starting driving motor and drives an upper end plate of a lifting mechanism assembly to ascend to a target position, then the control assembly controls an electric valve on a gas transmission pipeline of a gas source to inflate the interior of a flexible supporting assembly until the target pressure is reached, meanwhile, a feedback value of a force sensor at the contact position of the lifting mechanism assembly and the upper end plate is monitored, the inflation pressure of the flexible supporting assembly is finely adjusted according to the distribution of residual supporting force of each supporting point, so that the residual supporting force of each supporting point is consistent, and then the electric valve is closed;
s3, starting a test, controlling the driving motor to be started by the control assembly again, driving the lifting mechanism assembly to slowly descend for a certain height, supporting a test product and the upper end plate completely by the flexible supporting assembly, pressing the upper end plate and the flexible supporting assembly to move downwards due to the gravity of the test product, and quickly achieving new balance between the gravity of the test product and the support of the flexible supporting assembly due to the fact that an air bag in the flexible supporting assembly has the characteristic of being compressible so as to achieve flexible suspension support of the test product;
s4, after the test is finished, the control assembly controls and starts the driving motor, drives the lifting mechanism assembly to ascend and support the upper end plate, then controls the electric valve to exhaust the flexible supporting assembly, at the moment, the test product and the upper end plate are completely supported by the lifting mechanism assembly, the control assembly controls the driving motor, and the driving lifting mechanism is driven to descend to a complete supporting state of the stand column before the test starts.
(III) advantageous effects
According to the free boundary simulation support module, the lifting mechanism assembly is adopted to realize lifting of a test product before and after a test, the flexible support assembly is adopted to support the test product in the test process, on one hand, free boundary simulation required by a modal test is realized, and on the other hand, the mechanical structure synchronous lifting is adopted to solve the problems that the lifting safety of the flexible support assembly is poor, coupling exists in the multi-flexible support floating process, the control method is complex and the like. The free boundary simulation support module improves the stability and reliability of the flexible support, has strong universality as a modularized product, and is suitable for combined use.
Drawings
Fig. 1 is a three-dimensional structure diagram of a free boundary simulation support module according to the present invention.
FIG. 2 is a schematic diagram of the operation of a free boundary simulation support module of the present invention.
In the drawings, 1-upper end plate; 2-air bag; 3-a throttle regulator; 4-a lead screw; 5-upright column; 6-gear steering; 7-a transmission shaft; 8-driving a motor; 9-lower end plate; 10-connecting the trachea; 11-additional air chambers; 12-a flexible support member; 13-a lifting mechanism assembly; 14-a control assembly; 15-gas source.
Detailed Description
Referring to fig. 1:
the invention discloses a free boundary simulation support module, which comprises an end plate assembly, a lifting mechanism assembly 13, a flexible support assembly 12 and a control assembly 14; the end plate assembly comprises an upper end plate 1 and a lower end plate 9, the lower end plate 9 is used for fixing the free boundary simulation support module, and the upper end plate 1 is used for connecting a test product; the lifting mechanism assembly 13 comprises a driving motor 8, a transmission shaft 7, a gear steering gear 6, a lead screw 4 and an upright post 5; the plurality of upright posts 5 are fixedly arranged on a lower end plate 6, the upright posts 5 are connected to the lower end surface of an upper end plate 1 through respective lead screws 4, a driving motor 8 is arranged between two adjacent upright posts 5, two output ends of the driving motor 8 transmit power to gear steering gears 6 on the corresponding upright posts 5 through corresponding transmission shafts 7, and the gear steering gears 6 are communicated to the insides of the corresponding upright posts 5 and are in transmission connection with the corresponding lead screws 4; a transmission shaft 7 and a gear steering gear 6 are arranged between every two adjacent upright columns 5 to obtain power of a driving motor 8, so that synchronous lifting of corresponding lead screws 4 on the upright columns 7 is realized, and lifting action of an upper end plate 1 is realized, wherein the upper ends of the lead screws 4 and the upper ends of the upright columns 5 are not fixedly connected with the upper end plate 1; a flexible supporting component 12 is arranged in a space enclosed by the plurality of upright posts 5 between the upper end plate 1 and the lower end plate 9.
The flexible supporting component 12 comprises an air bag 2, an additional air chamber 11, a connecting air pipe 10 and a throttling regulator 3; the upper end of the air bag 2 is connected with the lower end face of the upper end plate 1, the air bag 2 is arranged above the additional air chamber 11, the air bag 2 is communicated with the additional air chamber 11 through the connecting air pipe 10, the throttling regulator 3 is arranged on the connecting air pipe 10, and on-off control of the air bag 2 and the additional air chamber 11 can be realized.
The flexible supporting components 12 are arranged in a plurality of and evenly distributed.
The control assembly 14 includes respective sensors and controllers.
The sensor comprises a force sensor.
The force sensor is arranged between the upright post 5 and the upper end plate 1 for measuring the contact force between the upright post and the upper end plate.
The end plate assembly has sufficient strength and rigidity to ensure its load-bearing capacity.
In the lifting mechanism assembly 13, the driving motor 8 is used for providing power for the lifting mechanism assembly 13; the transmission shaft 7 is used for connecting the driving motor 8 and the lead screw 4; the gear steering gear 6 is used for changing the driving rotation direction of the transmission shaft 7, so that the up-and-down operation of the screw rod 4 is realized; the screw rod 4 is used for realizing the lifting function and completing the lifting or descending of the upper end plate 1; the upright post 5 is used for fixing the screw rod 4 and supporting a test product before the test starts or after the test finishes;
in the flexible supporting component 12, the air bag 2 is used for providing support for a test product in a modal test process so as to simulate the free-free boundary state of the test product; the additional air chamber 11 is used for expanding the volume of the air bag 2 and reducing the supporting frequency of the system; the connecting air pipe 10 is used for connecting the air bag 2 with the additional air chamber 11; the throttle regulator 3 is arranged on the connecting air pipe 11 and is used for switching the air bag 2 and the additional air chamber 11 on and off, and can realize the regulation of throttle damping.
The control component 14 is used for overall control of the free boundary simulation support module, so that a test product can be stably suspended on the flexible support component 12 before a test is started, and the test product can stably fall back to the support upright post 5 after the test is finished, and the safety and reliability of the overall system are ensured.
Referring to fig. 2:
a method for using a free boundary simulation support module comprises the following steps:
s1, before a test is started, a test product is fixed on an upper end plate 1 and supported by a stand column 5, and at the moment, a flexible supporting component 12 is not inflated;
s2, during test preparation, according to the height of a test product, the control assembly 14 controls the starting of the driving motor 8 and drives the lifting mechanism assembly 13 to support the upper end plate 1 to ascend to a target position, then the control assembly 14 controls an electric valve on a gas transmission pipeline of the gas source 15 to inflate the interior of the flexible supporting assembly 12 until the target pressure is reached, meanwhile, the feedback value of a force sensor at the contact position of the lifting mechanism assembly 13 and the upper end plate 1 is monitored, the inflation pressure of the flexible supporting assembly 12 is finely adjusted according to the distribution of the residual supporting force of each supporting point, so that the residual supporting force of each supporting point is consistent, and then the electric valve is closed;
s3, starting the test, controlling the starting of the driving motor 8 by the control assembly 14 again, driving the lifting mechanism assembly 13 to slowly descend for a certain height, supporting the test product and the upper end plate 1 completely by the flexible supporting assembly 12 at the moment, pressing the upper end plate 1 and the flexible supporting assembly 12 to move downwards due to the gravity of the test product at the moment, and rapidly achieving new balance between the gravity of the test product and the support of the flexible supporting assembly 12 due to the fact that the air bag 2 in the flexible supporting assembly 12 has the compressible characteristic, so that flexible suspension support for the test product is achieved;
s4, after the test is finished, the control assembly 14 controls the starting of the driving motor 8, the lifting mechanism assembly 13 is driven to ascend and support the upper end plate 1, then the electric valve is controlled to exhaust the flexible supporting assembly 12, at the moment, the test product and the upper end plate 1 are completely supported by the lifting mechanism assembly 13, the control assembly 14 controls the driving motor 8, and the lifting mechanism 10 is driven to descend to the state that the stand column is completely supported before the test starts.
Claims (6)
1. The use method of the free boundary simulation support module is characterized in that the support module comprises an end plate assembly, a lifting mechanism assembly, a flexible support assembly and a control assembly; the end plate assembly comprises an upper end plate and a lower end plate, the lower end plate is used for fixing the free boundary simulation support module, and the upper end plate is used for connecting a test product; the lifting mechanism assembly comprises a driving motor, a transmission shaft, a gear steering gear, a lead screw and an upright post; the plurality of upright columns are fixedly arranged on the lower end plate, the upright columns are connected to the lower end surface of the upper end plate through respective screw rods, a driving motor is arranged between two adjacent upright columns, two output ends of the driving motor transmit power to gear steering gears on the corresponding upright columns through corresponding transmission shafts, and the gear steering gears are communicated to the insides of the corresponding upright columns and are in transmission connection with the corresponding screw rods; a transmission shaft and a gear steering gear are arranged between every two adjacent upright columns to obtain the power of a driving motor, and the synchronous lifting of corresponding screw rods on the upright columns is realized to realize the lifting action of an upper end plate, wherein the upper ends of the screw rods and the upright columns are not fixedly connected with the upper end plate; a flexible supporting component is arranged in a space defined by the plurality of stand columns between the upper end plate and the lower end plate;
in the lifting mechanism assembly, a driving motor is used for providing power for the lifting mechanism assembly; the transmission shaft is used for connecting the driving motor and the lead screw; the gear steering gear is used for changing the driving rotation direction of the transmission shaft, so that the up-and-down operation of the screw rod is realized; the screw rod is used for realizing the lifting function and completing the lifting or descending of the upper end plate; the upright column is used for fixing the screw rod and supporting a test product before the test starts or after the test finishes;
in the flexible supporting assembly, the air bag is used for providing support for a test product in a modal test process so as to simulate a free-free boundary state of the test product; the additional air chamber is used for expanding the volume of the air bag and reducing the supporting frequency of the system; the connecting air pipe is used for connecting the air bag and the additional air chamber; the throttling regulator is arranged on the connecting air pipe, is used for switching on and off the air bag and the additional air chamber, and can realize the regulation of throttling damping;
the control assembly is used for overall control of the free boundary simulation support module so as to realize that a test product is stably suspended on the flexible support assembly before the test starts and the test product stably falls back onto the support upright post after the test is finished, thereby ensuring the safety and reliability of the overall system;
the supporting module is a modularized product, has strong universality and is suitable for combined use;
the use method of the support module comprises the following steps:
s1, before a test is started, a test product is fixed on an upper end plate and supported by a stand column, and at the moment, a flexible supporting component is not inflated;
s2, during test preparation, according to the height of a test product, a control assembly controls a starting driving motor and drives an upper end plate of a lifting mechanism assembly to ascend to a target position, then the control assembly controls an electric valve on a gas transmission pipeline of a gas source to inflate the interior of a flexible supporting assembly until the target pressure is reached, meanwhile, a feedback value of a force sensor at the contact position of the lifting mechanism assembly and the upper end plate is monitored, the inflation pressure of the flexible supporting assembly is finely adjusted according to the distribution of residual supporting force of each supporting point, so that the residual supporting force of each supporting point is consistent, and then the electric valve is closed;
s3, starting a test, controlling the driving motor to be started by the control assembly again, driving the lifting mechanism assembly to slowly descend for a certain height, supporting a test product and the upper end plate completely by the flexible supporting assembly, pressing the upper end plate and the flexible supporting assembly to move downwards due to the gravity of the test product, and quickly achieving new balance between the gravity of the test product and the support of the flexible supporting assembly due to the fact that an air bag in the flexible supporting assembly has the characteristic of being compressible so as to achieve flexible suspension support of the test product;
s4, after the test is finished, the control assembly controls and starts the driving motor, drives the lifting mechanism assembly to ascend and support the upper end plate, then controls the electric valve to exhaust the flexible supporting assembly, at the moment, the test product and the upper end plate are completely supported by the lifting mechanism assembly, the control assembly controls the driving motor, and the driving lifting mechanism is driven to descend to a complete supporting state of the stand column before the test starts.
2. A method of using a free boundary simulation support module of claim 1 wherein the flexible support assembly comprises a bladder, an additional air chamber, a connecting air tube, a throttle actuator; the upper end of the air bag is connected with the lower end face of the upper end plate, the air bag is arranged above the additional air chamber, the air bag is communicated with the additional air chamber through the connecting air pipe, the throttling regulator is arranged on the connecting air pipe, and on-off control of the air bag and the additional air chamber can be realized.
3. The method as claimed in claim 2, wherein the flexible supporting members are arranged in a plurality and uniformly distributed.
4. A method of using a free boundary simulation support module as claimed in claim 3 wherein the control assembly includes respective sensors and controllers.
5. The method of using a free boundary modeling support module of claim 4, wherein the sensor includes a force sensor; the force sensor is arranged between the upright post and the upper end plate and used for measuring the contact force between the upright post and the upper end plate.
6. The method of using a free boundary simulation support module of claim 1 wherein the end plate assembly has sufficient strength and rigidity to ensure its load carrying capacity.
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| CN202011001837.XA CN112340056B (en) | 2020-09-22 | 2020-09-22 | Free boundary simulation support module |
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| CN202011001837.XA CN112340056B (en) | 2020-09-22 | 2020-09-22 | Free boundary simulation support module |
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| CN112936202B (en) * | 2021-03-26 | 2023-06-23 | 北京中科宇航技术有限公司 | Solid carrier rocket assembly trolley |
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| US6257067B1 (en) * | 1999-04-28 | 2001-07-10 | Hughes Electronics Corporation | Vertical direction spacecraft vibration test system with pseudo-free boundary conditions |
| US8839675B2 (en) * | 2012-04-17 | 2014-09-23 | The Boeing Company | System and method for ground vibration testing and weight and balance measurement |
| CN103616150B (en) * | 2013-12-04 | 2016-08-17 | 中国飞机强度研究所 | Aircraft air spring lifting bearing |
| CN204437157U (en) * | 2014-12-19 | 2015-07-01 | 成都飞机设计研究所 | A kind of pneumatic spring that aircraft can be made to suspend |
| CN206457202U (en) * | 2016-12-29 | 2017-09-01 | 广东北玻臻兴玻璃技术工业有限公司 | A kind of post precise elevating gear of crossbeam four |
| CN110207963B (en) * | 2019-05-29 | 2021-01-05 | 北京强度环境研究所 | Free-free boundary simulation device for air spring elastic support vertical structure |
| CN110344966B (en) * | 2019-07-16 | 2021-01-05 | 北京强度环境研究所 | Device and method for constructing free boundary of solid rocket ground test |
| CN111665742B (en) * | 2020-06-22 | 2021-08-03 | 北京强度环境研究所 | Airbag supporting free boundary simulation control system and control method thereof |
| CN111579237A (en) * | 2020-06-23 | 2020-08-25 | 北京强度环境研究所 | Free boundary simulation system for modal test |
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