CN115585972A - Adjustable vibration flexible decoupling device, test system and decoupling method - Google Patents
Adjustable vibration flexible decoupling device, test system and decoupling method Download PDFInfo
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- CN115585972A CN115585972A CN202211002717.0A CN202211002717A CN115585972A CN 115585972 A CN115585972 A CN 115585972A CN 202211002717 A CN202211002717 A CN 202211002717A CN 115585972 A CN115585972 A CN 115585972A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
Abstract
The application provides an adjustable vibration flexible decoupling device, a test system and a decoupling method, wherein the decoupling device comprises a rigid rod, flexible rods and two bases, and the number of the flexible rods is 0-6; two ends of the rigid rod are respectively fixedly connected with the central points of the two bases; when the number of the flexible rods is 1-6, the two ends of each flexible rod are detachably connected with the two bases respectively, and the flexible rods are arranged around the rigid rods. According to the decoupling device and the decoupling method, decoupling devices of different levels can be selected according to the decoupling difficulty of different decoupling points, and the phenomenon that the local decoupling effect of the system is poor is avoided.
Description
Technical Field
The application relates to the technical field of multi-axis vibration control and methods, in particular to an adjustable vibration flexible decoupling device and method.
Background
The decoupling device is an important device of a multi-axis vibration test system, and can realize mechanical decoupling of axial vibration. For a multi-axis vibration test system, a spherical coupler is generally used for decoupling, the decoupling effect of the method is good, but for the vibration test system in asymmetric arrangement, a ball decoupling device has the problems of uneven stress and large decoupling angle of partial devices, so that safety problems such as incapability of enabling a ball to normally return to a balance position, overhigh internal temperature and the like are easily caused.
Disclosure of Invention
In view of this, an object of the present application is to provide an adjustable vibration flexible decoupling device, a test system, and a decoupling method.
Based on the purpose, the application provides an adjustable vibration flexible decoupling device, which comprises a rigid rod, flexible rods and two bases, wherein the number of the flexible rods is 0-6;
two ends of the rigid rod are respectively fixedly connected with the central points of the two bases;
when the number of the flexible rods is 1-6, the two ends of each flexible rod are detachably connected with the two bases respectively, and the flexible rods are arranged around the rigid rods.
Further, the flexible rod is an aluminum rod.
Further, the rigid rod is a stainless steel rod.
Further, the base includes fixed part and connecting portion, connecting portion for the fixed part protrusion sets up, just, the fixed part with connecting portion coaxial arrangement, connecting portion be used for with the flexible pole with the rigid rod is connected, the fixed part is used for fixing the decoupling zero device.
Further, the flexible rod is in threaded connection with the base.
The application still provides a flexible decoupling test system of vibration with adjustable, including vibration exciter, simulation mesa and foretell decoupling device, decoupling device is located the vibration exciter with between the simulation mesa, a base of decoupling device with the output terminal surface fixed connection of vibration exciter, another base with simulation mesa fixed connection.
Further, the vibration exciters and the decoupling devices are provided in plurality, the simulation table top is configured to be connected with the decoupling devices, and each decoupling device is connected with one vibration exciter.
The application also provides a decoupling method of the adjustable vibration flexible decoupling test system, which comprises the following steps:
acquiring a decoupling angle of a decoupling point in the vibration test system, wherein the decoupling point is a connecting point of the decoupling device and the simulation table top;
responding to the decoupling angle of 7-8 degrees, wherein the number of flexible rods of the decoupling device corresponding to the decoupling point is 0-1;
responding to the decoupling angle of 5-7 degrees, wherein the number of flexible rods of the decoupling device corresponding to the decoupling point is 1-2;
responding to the decoupling angle being 1.5-5 degrees, wherein the number of the flexible rods of the decoupling device corresponding to the decoupling point is 2-4;
and responding to the decoupling angle being 1-1.5 degrees, wherein the number of the flexible rods of the decoupling device corresponding to the decoupling point is 4-6.
Further, before the obtaining of the decoupling angle of the decoupling point in the vibration test system, the decoupling method further includes judging whether the vibration test system is a symmetric system;
responding to that the vibration test system is a symmetrical system, and the decoupling angles of all the decoupling points of the vibration test system are the same;
and responding to the fact that the vibration test system is an asymmetric system, and acquiring decoupling angles of a plurality of decoupling points of the vibration test system one by one.
Further, the decoupling angle of the decoupling point is positively correlated with the vibration magnitude of the vibration exciter corresponding to the decoupling point.
From the above, the decoupling device, the test system and the decoupling method are provided, wherein the decoupling device forms the decoupling device by the flexible rod, the rigid rod and the base, the decoupling performance of the decoupling device is changed by adjusting the number of the flexible rods, so that the decoupling device is light in design, convenient to use and disassemble and high in flexibility.
Drawings
In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for the embodiments or related technologies in the following description are briefly introduced, and it is obvious that the drawings in the following description are only the embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1a is a schematic structural diagram of an adjustable flexible vibration decoupling device according to an embodiment of the present application, where the number of flexible rods is 6;
FIG. 1b is a schematic structural diagram of an adjustable flexible vibration decoupling device according to an embodiment of the present application, where the number of flexible rods is 4;
FIG. 1c is a schematic structural diagram of an adjustable flexible vibration decoupling device according to an embodiment of the present invention, where the number of flexible rods is 2;
FIG. 1d is a schematic structural diagram of the adjustable flexible decoupling device for vibration according to the embodiment of the present application, where the number of flexible rods is 0;
FIG. 2 is a schematic structural diagram of an adjustable vibration flexible decoupling test system according to an embodiment of the application;
FIG. 3a is a schematic structural diagram of an adjustable vibration flexible decoupling test system in a symmetrical structure according to an embodiment of the present application;
FIG. 3b is a schematic structural diagram of an adjustable vibration flexible decoupling test system of the embodiment of the present application in an asymmetric structure;
FIG. 4 is a schematic diagram of the variability analysis of the adjustable vibration decoupling apparatus in the embodiment of the present application.
In the figure; 1. a rigid rod; 2. a flexible rod; 3. a base; 31. a fixed part; 32. a connecting portion; 4. a vibration exciter; 5. simulating a table top; 6. a decoupling device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
An air defense missile is a rather complex system of multiple degrees of freedom. The inherent frequency of the missile and the system in the missile is very complex, if the excitation is only 30HZ, the equipment with the inherent frequency near the 30HZ can be preliminarily examined, other frequencies are not examined, the equipment is subjected to random vibration with very wide frequency band in actual flight, namely, the vibration response of the missile body structure and the equipment can be excited by the energy on each frequency in the vibration source, and the response can cause what results and has no hidden danger of causing launching failure. If a plurality of vibration exciters are used for random vibration excitation, the vibration condition of actual flight can be well simulated, and in the actual flight, the fault caused by vibration can be found and eliminated in an on-site acceptance test, so that the high qualified rate of on-site products is ensured. The requirement that the vibration table applying multiple vibration exciters performs multi-axial multi-degree-of-freedom random vibration on the unfolded missile is particularly important to replace a unidirectional vibration test.
As the background technology, the prior art usually utilizes a spherical coupler to decouple, the decoupling effect of the method is good, but for a vibration test system which is asymmetrically arranged, a ball head decoupling device has the problems of uneven stress and large decoupling angle of partial devices, so that the ball head can not normally return to a balanced position, the internal temperature is too high, and other safety problems are easily caused. Therefore, a decoupling device adjustable for different situations is needed for a test system to perform decoupling.
In view of the above, as shown in fig. 1a to 1d, the present embodiment provides an adjustable flexible vibration decoupling device 6, which includes a rigid rod 1, flexible rods 2 and two bases 3, where the number of the flexible rods 2 is 0 to 6, and the number of the flexible rods may be 0,1,2,3,4,5,6.
Two ends of the rigid rod 1 are respectively fixedly connected with the central points of the two bases 3;
when the number of the flexible rods 2 is 1-6, the two ends of the flexible rods 2 are detachably connected with the two bases 3 respectively, and the flexible rods 2 are arranged around the rigid rods 1.
In addition, the decoupling device 6 is suitable for decoupling vibrations of 5 to 200HZ, and vibrations exceeding this range are detrimental to the decoupling effect of the decoupling device 6.
In some embodiments, the flexible rod 2 is an aluminum rod. The flexibility of the aluminum rod is better, and the aluminum rod can meet the decoupling requirement in the decoupling device 6.
Specifically, in practical application, the flexible rod 2 may be made of any flexible material, and is not limited to an aluminum rod, so as to meet the actual decoupling requirement of the decoupling device 6.
In some embodiments, the rigid rod 1 is a stainless steel rod, and the stainless steel rod has good rigidity, so that the requirement of the rigid rod 1 on rigidity in the decoupling device 6 can be met, and a certain supporting effect can be achieved.
Specifically, in practical applications, the rigid rod 1 may be made of any rigid rod 1 made of a material with certain rigidity, and is not limited to a stainless steel, so as to meet the actual decoupling requirement of the decoupling device 6.
In some embodiments, the base 3 comprises a fixing portion 31 and a connecting portion 32, the connecting portion 32 is disposed in a protruding manner with respect to the fixing portion 31, the fixing portion 31 is disposed coaxially with the connecting portion 32, the connecting portion 32 is configured to be connected with the flexible rod 2 and the rigid rod 1, and the fixing portion 31 is configured to fix the decoupling device 6. The connecting portion 32 is arranged to protrude from the rigid rod 1 relative to the fixing portion 31, the rigid rod 1 and the flexible rod 2 are connected to the connecting portion 32 on the base 3, the fixing portion 31 is arranged coaxially with the connecting portion 32, the connecting portion 32 is located in the center of the base 3, the fixing portion 31 is located on the periphery of the connecting portion 32, and the fixing portion 31 is used for being fixedly connected with other objects to fix the decoupling device 6 when the decoupling device 6 is installed.
In some embodiments, the flexible rod 2 is threadedly connected to the base 3. The flexible rod 2 with the base 3 is for dismantling the connection, both can satisfy through threaded connection and can dismantle the connection, also can be connected the fixed effect of back better, and to a great extent has avoided the flexible rod 2 with the base 3 breaks away from and causes the unstable condition of connection.
The embodiment provides an adjustable vibration flexible decoupling test system, as shown in fig. 2, which includes a vibration exciter 4, a simulation table 5 and the decoupling device 6, where the decoupling device 6 is located between the vibration exciter 4 and the simulation table 5, one base 3 of the decoupling device 6 is fixedly connected to an output end face of the vibration exciter 4, and the other base 3 is fixedly connected to the simulation table 5. The vibration exciter 4 is a vibration source, the simulation table board 5 is a test bed, and the decoupling device 6 is installed between the vibration exciter 4 and the simulation table board 5 and can decouple the motion brought by the vibration exciter 4, so that the test requirements of the test system are met.
In some embodiments, as shown in fig. 3a and 3b, said exciters 4 and said decoupling means 6 are provided in plurality, said simulated table 5 being configured to be connected to a plurality of said decoupling means 6, each said decoupling means 6 being connected to a said exciter 4. For the test system, to ensure that the simulation effect of the test needs to apply acting forces with different magnitudes in different directions to the simulation table-board 5, the vibration exciter 4 is connected with the simulation table-board 5 through the decoupling device 6 to form the test system of various simulation tests, and the decoupling device 6 can also play a decoupling role for different vibration exciters 4.
The embodiment provides a decoupling method of an adjustable vibration flexible decoupling test system, data in the embodiment are all made under the condition that a flexible rod 2 of a decoupling device 6 is an aluminum rod and a rigid rod 1 is a stainless steel rod, if the flexible rod 2 or the rigid rod 1 in the decoupling device 6 is changed into other materials, corresponding data need to be recalculated, and the decoupling method comprises the following steps:
and acquiring a decoupling angle of a decoupling point in the vibration test system, wherein the decoupling point is a connecting point of the decoupling device 6 and the simulation table top 5, the decoupling angle is an offset angle of the decoupling point relative to a vertical line under the action of external force, and the decoupling angle of the decoupling point in the vibration test system is obtained by simulation calculation through simulation software-ANSYS finite element software.
In response to the decoupling angle being 7-8 degrees, the number of the 2 flexible rods of the decoupling device 6 corresponding to the decoupling point is 0-1, and at the moment, the axial stiffness of the decoupling device 6 is 35000N/m, so that the decoupling angle can meet the decoupling requirement, and a certain supporting effect can be borne, thereby avoiding the axial damage of the decoupling device 6.
And responding to the decoupling angle of 5-7 degrees, wherein the number of the flexible rods 2 of the decoupling device 6 corresponding to the decoupling point is 1-2, and the axial rigidity of the decoupling device 6 is 38000N/m at the moment.
And responding to the decoupling angle of 1.5-5 degrees, wherein the number of the flexible rods 2 of the decoupling device 6 corresponding to the decoupling point is 2-4, and the axial rigidity of the decoupling device 6 is 41000N/m at the moment.
In response to the decoupling angle being 1-1.5 degrees, the number of the flexible rods 2 of the decoupling device 6 corresponding to the decoupling point is 4-6, and the axial stiffness of the decoupling device 6 is 45000N/m at this time.
It can be seen that as the number of the flexible rods 2 increases, the axial stiffness of the decoupling device 6 gradually increases, the decoupling angle of the decoupling device 6 gradually decreases, and when the decoupling device 6 is selected, the decoupling angle of the decoupling device 6 and the axial stiffness of the decoupling device 6 are considered, so as to ensure the decoupling effect of the decoupling device 6.
Specifically, as shown in fig. 4, when the rigid rod 1 is a stainless steel rod and the flexible rod 2 is an aluminum rod, the decoupling angle and the axial stiffness of the decoupling device 6 are related to the number of the flexible rods 2, and as the number of the flexible rods increases, the decoupling angle is gradually decreased in a nonlinear manner, and the axial stiffness is gradually increased.
In some embodiments, before the obtaining the decoupling angle of the decoupling point in the vibration testing system, the decoupling method further includes determining whether the vibration testing system is a symmetric system;
in response to that the vibration test system is a symmetric system, as shown in fig. 3a, the decoupling angles of all the decoupling points of the vibration test system are the same, and at this time, only the decoupling angle of one decoupling point in the vibration test system needs to be obtained, and on this basis, the decoupling device 6 corresponding to the decoupling angle is determined, and then the mounting is performed, and the mounting of the decoupling device 6 and the mounting of the vibration exciter 4 are in one-to-one correspondence.
In response to that the vibration test system is an asymmetric system, as shown in fig. 3b, decoupling angles of the decoupling points of the vibration test system need to be acquired one by one, at this time, moments received by the decoupling points are different and are not necessarily regularly distributed, and the decoupling angles of the decoupling points need to be acquired one by one, so that the required decoupling device 6 is determined.
For the asymmetric vibration test system shown in fig. 3b, simulation software-ANSYS finite element software is used for obtaining a decoupling angle of the decoupling point through simulation calculation, and the result shows that the decoupling angles of the decoupling points a, b and c are the same, the decoupling angle is higher, and the decoupling difficulty is higher; decoupling angles of the decoupling points d, e, f and g are the same, the decoupling angles are medium, and the decoupling difficulty is simple; the decoupling angle of the decoupling point h is the lowest, and the decoupling difficulty is the simplest.
Specifically, in the test process, the decoupling force or moment required by the decoupling points a, b and c is relatively large, the corresponding decoupling angle is 6 degrees, and the decoupling device with the number of the flexible rods being 2 can be selected; the decoupling points d, e, f and g are subjected to smaller forces or moments than the decoupling points a, b and c, the corresponding decoupling angles are 1.5 degrees, and the decoupling devices with the number of the flexible rods being 4 can be selected; the decoupling point h is relatively far from the vibration exciter, the force or the moment applied to the decoupling point h is small, and the decoupling device with the number of the flexible rods being 6 can be selected.
In some embodiments, the decoupling angle of the decoupling point is positively correlated with the vibration magnitude of the vibration exciter 4 corresponding to the decoupling point, and on the same condition, the higher the vibration magnitude of the vibration exciter 4 is, the larger the decoupling angle of the decoupling point is.
It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.
Claims (10)
1. An adjustable vibration flexible decoupling device is characterized by comprising rigid rods, flexible rods and two bases, wherein the number of the flexible rods is 0-6;
two ends of the rigid rod are respectively fixedly connected with the central points of the two bases;
when the number of the flexible rods is 1-6, the two ends of each flexible rod are detachably connected with the two bases respectively, and the flexible rods are arranged around the rigid rods.
2. The adjustable vibration flexible decoupling apparatus of claim 1 wherein said flexible rods are aluminum rods.
3. The adjustable vibration flexible decoupling apparatus of claim 1 wherein said rigid rods are stainless steel rods.
4. The adjustable vibration decoupling device of claim 1 wherein said base includes a fixing portion and a connecting portion, said connecting portion is disposed in a protruding manner relative to said fixing portion, and said fixing portion is disposed coaxially with said connecting portion, said connecting portion is configured to connect with said flexible rod and said rigid rod, and said fixing portion is configured to fix said decoupling device.
5. The adjustable vibrationally flexible decoupling apparatus of claim 1, wherein said flexible rod is threadably connected to said base.
6. An adjustable vibration flexible decoupling test system is characterized by comprising a vibration exciter, a simulation table board and the decoupling device as claimed in any one of claims 1 to 5, wherein the decoupling device is located between the vibration exciter and the simulation table board, one base of the decoupling device is fixedly connected with the output end face of the vibration exciter, and the other base of the decoupling device is fixedly connected with the simulation table board.
7. The adjustable vibration flexible decoupling testing system according to claim 6, wherein a plurality of vibration exciters and a plurality of decoupling devices are provided, the simulation table is configured to be connected with the plurality of decoupling devices, and each decoupling device is connected with one vibration exciter.
8. The decoupling method of the adjustable vibration flexible decoupling test system according to any one of claims 6 to 7, comprising the following steps:
acquiring a decoupling angle of a decoupling point in the vibration test system, wherein the decoupling point is a connecting point of the decoupling device and the simulation table top;
responding to the decoupling angle of 7-8 degrees, wherein the number of flexible rods of the decoupling device corresponding to the decoupling point is 0-1;
responding to the decoupling angle of 5-7 degrees, wherein the number of flexible rods of the decoupling device corresponding to the decoupling point is 1-2;
responding to the decoupling angle being 1.5-5 degrees, wherein the number of the flexible rods of the decoupling device corresponding to the decoupling point is 2-4;
and responding to the decoupling angle being 1-1.5 degrees, wherein the number of the flexible rods of the decoupling device corresponding to the decoupling point is 4-6.
9. The decoupling method of the adjustable vibration flexible decoupling test system according to claim 8, wherein before the decoupling angle of the decoupling point in the vibration test system is obtained, the decoupling method further comprises judging whether the vibration test system is a symmetric system;
responding to the fact that the vibration test system is a symmetrical system, and decoupling angles of all decoupling points of the vibration test system are the same;
and responding to the fact that the vibration test system is an asymmetric system, and acquiring decoupling angles of a plurality of decoupling points of the vibration test system one by one.
10. The decoupling method of the adjustable flexible decoupling testing system for vibration according to claim 9, wherein the decoupling angle of the decoupling point is positively correlated with the vibration magnitude of the vibration exciter corresponding to the decoupling point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211002717.0A CN115585972A (en) | 2022-08-19 | 2022-08-19 | Adjustable vibration flexible decoupling device, test system and decoupling method |
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| CN202211002717.0A CN115585972A (en) | 2022-08-19 | 2022-08-19 | Adjustable vibration flexible decoupling device, test system and decoupling method |
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