CN115655624A - Screening device and screening method for airborne photoelectric shock absorber - Google Patents
Screening device and screening method for airborne photoelectric shock absorber Download PDFInfo
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- CN115655624A CN115655624A CN202211265025.5A CN202211265025A CN115655624A CN 115655624 A CN115655624 A CN 115655624A CN 202211265025 A CN202211265025 A CN 202211265025A CN 115655624 A CN115655624 A CN 115655624A
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Abstract
The invention belongs to the technical field of optical machine assembly and adjustment, and particularly relates to a screening device and a screening method for an airborne photoelectric shock absorber. The performance test device is used for realizing the performance test of the vibration absorber for the airborne photoelectric pod on the vibration table; the screening device of the airborne photoelectric pod shock absorber comprises an upper screening device mounting seat, a lower screening device mounting seat, a connecting strut, a first acceleration sensor, a second acceleration sensor, an upper transfer block and a lower transfer block; the special tool is arranged, so that the screening efficiency and the screening precision of the airborne photoelectric shock absorber can be greatly improved, and potential performance hazards caused by inaccurate screening results are avoided.
Description
Technical Field
The invention belongs to the technical field of optical-mechanical assembly and adjustment, and particularly relates to a screening device and a screening method for an airborne photoelectric shock absorber.
Background
The existing airborne photoelectric pod shock absorber does not have a special screening tool, and has single screening means and low efficiency.
Disclosure of Invention
In view of the above, the invention provides a screening device and a screening method for an airborne photoelectric shock absorber, wherein a special tool is arranged, so that the screening efficiency and the screening precision of the airborne photoelectric shock absorber can be greatly enhanced, and potential performance hazards caused by inaccurate screening results are avoided.
In order to achieve the technical purpose, the invention adopts the following specific technical scheme:
a screening device for an airborne photoelectric pod shock absorber is used for realizing performance test of the shock absorber for the airborne photoelectric pod on a vibration table;
the method comprises the following steps: the device comprises a screening device upper mounting base, a screening device lower mounting base, a connecting support, a first acceleration sensor, a second acceleration sensor, an upper connecting block and a lower connecting block;
the two screening device mounting seats are connected and fastened based on the four connecting struts to form a rigid screening vibration tool;
four groups of shock absorber fixing holes are formed in the screening vibration tool and used for fixing four shock absorbers;
the upper transfer block and the lower transfer block form a rigid simulation load, and the simulation load is arranged in the screening vibration tool and is provided with four groups of combination holes;
during testing, the four groups of vibration absorbers are respectively fixed on the upper mounting seat and the lower mounting seat based on the fixing holes; each combination hole is used for simulating the installation form and the installation position of the onboard photoelectric pod on each shock absorber; the simulation load is used for simulating the load of the airborne photoelectric pod on each shock absorber;
the first acceleration sensor is used for acquiring the vibration characteristics of the screening vibration tool;
the second acceleration sensor is used for collecting the vibration characteristics of the simulation load.
Further, the number of the first acceleration sensors is at least two; and at least one first acceleration sensor is arranged on each screening device mounting seat.
Further, the second acceleration sensor is installed at a position close to the center of gravity of the dummy load.
Furthermore, the upper connecting block and the lower connecting block are provided with counterweight block mounting threaded holes; the counterweight block mounting threaded hole is used for fixing a counterweight block; the analog load is I-shaped.
Further, the indication directions of the first acceleration sensor and the second acceleration sensor are consistent with the vibration input direction of the vibration table.
Further, the vibration input direction of the vibration table comprises: heading direction, span direction and vertical direction.
Further, the invention also provides an airborne photoelectric pod shock absorber screening method based on the airborne photoelectric pod shock absorber screening device, which comprises the following steps:
s101: mounting the four shock absorbers in the same group between the four groups of mounting holes and combination holes which are mutually combined;
s102: applying vibration to the airborne photoelectric pod vibration absorber screening device based on the vibration table, collecting measurement data of the first acceleration sensor and feeding the measurement data back to a control system of the vibration table to realize a working condition vibration curve aiming at the screening vibration tool;
s103: obtaining vibration characteristics of the simulated load based on measurement data of a second acceleration sensor;
s104: and judging whether the four shock absorbers in the same group are qualified or not according to the vibration characteristics.
Further, a pre-vibration step is also included between S101 and S102; and the pre-vibration step is used for monitoring whether the operation condition of the screening device of the airborne photoelectric pod vibration absorber is normal or not under the driving of the vibration table.
Further, in the step S104, the method for determining whether the shock absorbers are qualified is to obtain natural frequencies and amplification factors of four shock absorbers of the same group based on the vibration characteristics and compare the natural frequencies and the amplification factors with design values; if the error exceeds 5%, the determination is failed.
Further, if the shock absorber is a three-way equal-stiffness shock absorber, the error is obtained by performing weighted average calculation based on natural frequencies and amplification factors of the four shock absorbers obtained in different vibration directions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of an airborne optoelectronic vibration damper screening apparatus in accordance with an embodiment of the present invention;
FIG. 2 is a sectional view taken along line B-B of an airborne photoelectric shock absorber screening device in accordance with an embodiment of the present invention;
FIG. 3 is a left side view of an airborne photoelectric shock absorber screening apparatus in accordance with an embodiment of the present invention;
FIG. 4 is a C-C sectional view of an airborne optoelectronic vibration absorber screening apparatus in accordance with an embodiment of the present invention;
wherein: 1. a screening device mounting base; 2. a first connection screw; 3. connecting the support columns; 4. a shock absorber; 5. a first acceleration sensor; 6. a second acceleration sensor; 7. an upper transfer block; 8. downwards transferring a connecting block; 9. a jackscrew; 10. a second connection screw; 11. a third connecting screw; 12. a nut; 13. and a fourth connecting screw.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be further noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, amount and proportion of each component in actual implementation may be changed freely, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
In one embodiment of the invention, the screening device for the vibration absorber 4 of the airborne photoelectric pod is provided and used for realizing the performance test of the vibration absorber 4 for the airborne photoelectric pod on a vibration table;
as shown in fig. 1-4, comprising: the device comprises a screening device upper mounting base, a screening device lower mounting base, a connecting support column 3, a first acceleration sensor 5, a second acceleration sensor 6, an upper transfer block 7 and a lower transfer block 8;
the two screening device mounting seats 1 are connected and fastened based on the four connecting support columns 3 to form a rigid screening vibration tool;
four groups of shock absorber fixing holes are formed in the screening vibration tool and used for fixing four shock absorbers;
the upper transfer block 7 and the lower transfer block 8 form a rigid simulation load, and the simulation load is arranged in the screening vibration tool and is provided with four groups of combination holes;
during testing, the four groups of vibration absorbers are respectively fixed on the upper mounting seat and the lower mounting seat based on the fixing holes; each combination hole is used for simulating the installation form and the installation position of the airborne photoelectric pod on each shock absorber; the simulation load is used for simulating the load of the airborne photoelectric pod on each shock absorber;
the first acceleration sensor 5 is used for acquiring the vibration characteristics of the screening vibration tool;
the second acceleration sensor 6 is used to acquire the vibration characteristics of the dummy load.
In one embodiment, the first acceleration sensors are at least two; two sieving mechanism mount pads 1 all install a first acceleration sensor at least.
In one embodiment, the second acceleration sensor is mounted near the center of gravity of the simulated load.
In one embodiment, the upper connecting block 7 and the lower connecting block 8 are provided with counterweight block mounting threaded holes; the counterweight block mounting threaded hole is used for fixing a counterweight block; the analog load is I-shaped.
In one embodiment, the pointing directions of the first acceleration sensor 5 and the second acceleration sensor 6 coincide with the vibration input direction of the vibration table.
In one embodiment, the vibration input direction of the vibration table includes: heading direction, span direction and vertical direction.
The screening device comprises a screening device mounting base 1, a first connecting screw 2, a connecting support column 3, a shock absorber 4, a first acceleration sensor 5, a second acceleration sensor 6, an upper connecting block 7, a lower connecting block 8, a jackscrew screw 9, a second connecting screw 10, a third connecting screw 11, a nut 12 and a fourth connecting screw 13.
The screening device mounting seat 1 is a flat plate and is rectangular, and U-shaped grooves are formed in two sides of the screening device mounting seat and are used for being connected with a vibration test bed;
the connecting strut 3 is columnar, and both ends of the connecting strut are provided with screw connecting holes;
the shock absorber 4 is in a shape that two discs are buckled together, and through holes are formed in the periphery and the middle of the shock absorber;
the upper transfer block 7 is in a T-shaped plate shape, two ends of the upper end of the T shape are respectively provided with two large through holes, and four screw holes are arranged around the through holes; the T-shaped bottom is provided with two rows of array countersunk through holes and two screw holes; the T-shaped middle part is provided with an array screw hole;
the lower connecting block 8 is in a T-shaped plate shape and has similar characteristics with the upper connecting block 7; the distance between two screw holes at the T-shaped bottom of the T-shaped connecting block is different from that of the upper connecting block 8;
the two screening device mounting seats 1 and the four connecting struts 3 are connected and fastened through first connecting screws 2 to form a screening vibration tool;
the 2 vibration absorbers 4 are fixedly connected with the upper transfer block 7 through third connecting screws 11, and then a second connecting screw 10 penetrates through a central hole of the vibration absorber 4 and is fixedly connected with the upper screening device mounting seat 1;
the 2 vibration absorbers 4 are fixedly connected with the lower connecting block 8 through third connecting screws 11; then a second connecting screw 10 is used for penetrating through a central hole of the shock absorber 4 and is fixedly connected with the lower screening device mounting seat 1;
after the installation is finished, the upper connecting block 7 and the lower connecting block 8 are fixedly connected through a nut 12 and a fourth connecting screw 13;
then 4 jackscrew screws 9 are respectively arranged on the front surface and the rear surface of the part consisting of the upper transfer block 7 and the lower transfer block 8 by a torque wrench;
the upper transfer block 7, the lower transfer block 8, the jackscrew bolt 9, the nut 12 and the fourth connecting screw 13 form a simulation load, the simulation load can be provided with a balancing weight in a hanging manner in the middle screw hole of the simulation load and used for screening the performance of the multi-type shock absorber 4, the simulation load in the embodiment is I-shaped, and the simulation load in different embodiments can be in other shapes;
a dummy load having the same size as the real case at the position where the four dampers 4 are installed; secondly, the natural frequency is not lower than 300HZ;
the two first acceleration sensors 5 are respectively bonded and screened at the upper and lower positions close to the shock absorber 4 in the vibration screening tool; the first acceleration sensor 5 is used for controlling external vibration input;
the second acceleration sensor 6 is bonded to the center of the simulation load; the second acceleration sensor 6 is used to output a response of the dummy load.
The indication directions of the first acceleration sensor 5 and the second acceleration sensor 6 are consistent with the vibration input direction;
the installation method of the airborne photoelectric shock absorber screening device comprises the following steps: the two screening device mounting seats 1 and the four connecting struts 3 are connected and fastened through first connecting screws 2 to form a screening vibration tool;
the 2 vibration absorbers 4 are fixedly connected with the upper transfer block 7 through third connecting screws 11, and then a second connecting screw 10 penetrates through a central hole of the vibration absorber 4 and is fixedly connected with the upper screening device mounting seat 1;
the 2 vibration absorbers 4 are fixedly connected with the lower connecting block 8 through third connecting screws 11; then a second connecting screw 10 is used for penetrating through a central hole of the shock absorber 4 and is fixedly connected with the lower screening device mounting seat 1;
after the installation is finished, the upper connecting block 7 and the lower connecting block 8 are fixedly connected through a nut 12 and a fourth connecting screw 13;
then 4 jackscrew screws 9 are respectively arranged on the front surface and the rear surface of the part consisting of the upper connecting block 7 and the lower connecting block 8 by a torque wrench;
based on the same inventive concept, the invention also provides an airborne photoelectric pod shock absorber screening method based on the airborne photoelectric pod shock absorber screening device, which comprises the following steps:
s101: the same group of four vibration dampers are arranged among the four groups of mutually combined mounting holes and combination holes;
s102: applying vibration to the screening device of the airborne photoelectric pod vibration absorber based on the vibration table, collecting measurement data of the first acceleration sensor 5 and feeding the measurement data back to a control system of the vibration table to realize a working condition vibration curve aiming at the screening vibration tool;
s103: obtaining the vibration characteristics of the dummy load based on the measurement data of the second acceleration sensor 6;
s104: and judging whether the four shock absorbers in the same group are qualified or not according to the vibration characteristics.
In one embodiment, a pre-vibration step is further included between S101 and S102; the pre-vibration step is used for monitoring whether the operation condition of the screening device of the airborne photoelectric pod vibration absorber is normal or not under the driving of the vibration table.
In one embodiment, in S104, the method for determining whether the shock absorber is qualified is to obtain natural frequencies and amplification factors of four shock absorbers of the same group based on the vibration characteristics and compare the natural frequencies and the amplification factors with design values; if the error exceeds 5%, the test piece is judged to be defective.
In one embodiment, if the vibration absorber is a three-way equal stiffness vibration absorber, the error is calculated by performing a weighted average calculation based on the natural frequencies and the amplification factors of the four vibration absorbers obtained in different vibration directions.
In the embodiment, when the vibration damper screening experiment is started, the external vibration input is controlled through two first acceleration sensors 5, and the response curve of the simulated load is read through a second acceleration sensor 6;
screening of a common airborne photoelectric product shock absorber needs 3-direction simulated airplane vibration tests; when screening test is carried out in a certain direction, the test vibration is carried out for 3 minutes according to a preset vibration curve generally; if the test is normal. The oscillation is started for 10 minutes and the second acceleration sensor 6 outputs a response curve simulating the load. After the vibration test in one direction is completed, the first acceleration sensor 5 and the second acceleration sensor 6 need to be detached and bonded again, so that the direction of the acceleration sensors is consistent with the vibration direction.
When the vibration test in three directions is finished; data of the natural frequency and the amplification factor of the shock absorber 4 in three directions are respectively obtained through a second acceleration sensor 6; for the three-way equal-stiffness shock absorber, the inherent frequency and the amplification factor of the shock absorber 4 are respectively obtained through weighted average; if the error of the natural frequency and the magnification is within the range of 5 percent, the product is judged to be qualified, and if the error exceeds the range, the product needs to be removed.
If the rigidity of the shock absorber 4 in three directions is inconsistent, the inherent frequency and the magnification of the three groups of data in the three directions of the shock absorber 4 are compared, if the error of the inherent frequency and the magnification is within the range of 5%, the data are judged to be qualified, and if the error of the inherent frequency and the magnification is beyond the range, the data are rejected.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. The screening device for the vibration absorber of the airborne photoelectric pod is characterized by being used for realizing performance test of the vibration absorber for the airborne photoelectric pod on a vibration table;
the method comprises the following steps: the device comprises a screening device upper mounting base, a screening device lower mounting base, a connecting support, a first acceleration sensor, a second acceleration sensor, an upper transfer block and a lower transfer block;
the two screening device mounting bases are connected and fastened on the basis of the four connecting struts to form a rigid screening vibration tool;
four groups of shock absorber fixing holes are formed in the screening vibration tool and used for fixing four shock absorbers;
the upper transfer block and the lower transfer block form a rigid simulation load, and the simulation load is arranged in the screening vibration tool and is provided with four groups of combination holes;
during testing, the four groups of vibration absorbers are respectively fixed on the upper mounting seat and the lower mounting seat based on the fixing holes; each combination hole is used for simulating the installation form and the installation position of the onboard photoelectric pod on each shock absorber; the simulation load is used for simulating the load of the airborne photoelectric pod on each shock absorber;
the first acceleration sensor is used for acquiring the vibration characteristics of the screening vibration tool;
the second acceleration sensor is used for collecting the vibration characteristics of the simulation load.
2. The airborne optoelectronic pod vibration damper screening apparatus of claim 1, wherein the first acceleration sensor is at least two; and at least one first acceleration sensor is arranged on each screening device mounting seat.
3. The on-board electro-optic pod vibration damper screening device of claim 2, wherein the second acceleration sensor is mounted proximate a center of gravity of the simulated load.
4. The screening device for the airborne photoelectric pod vibration absorber as claimed in claim 3, wherein the upper and lower junction blocks are provided with counterweight mounting threaded holes; the counterweight block mounting threaded hole is used for fixing a counterweight block; the analog load is I-shaped.
5. The screening apparatus for airborne optoelectronic pod vibration dampers according to claim 4, wherein the indicated direction of the first and second acceleration sensors is coincident with the vibration input direction of the vibration table.
6. The screening apparatus for airborne optoelectronic pod vibration dampers according to claim 5, wherein the vibration input direction of the vibration table comprises: course direction, span direction and vertical direction.
7. An airborne electro-optic pod shock absorber screening method performed by the airborne electro-optic pod shock absorber screening apparatus according to any one of claims 1-6, comprising the steps of:
s101: mounting the four shock absorbers in the same group between the four groups of mounting holes and combination holes which are mutually combined;
s102: applying vibration to the airborne photoelectric pod vibration absorber screening device based on the vibration table, collecting measurement data of the first acceleration sensor and feeding the measurement data back to a control system of the vibration table to realize a working condition vibration curve aiming at the screening vibration tool;
s103: obtaining vibration characteristics of the simulated load based on measurement data of a second acceleration sensor;
s104: and judging whether the four shock absorbers in the same group are qualified or not according to the vibration characteristics.
8. The screening method for the on-board electro-optic pod vibration damper according to claim 7, further comprising a pre-vibration step between S101 and S102; and the pre-vibration step is used for monitoring whether the operation condition of the screening device of the airborne photoelectric pod vibration absorber is normal or not under the driving of the vibration table.
9. The screening method of the on-board electro-optic pod shock absorber according to claim 8, wherein in the step S104, the determination of whether the shock absorber is qualified is performed by comparing natural frequencies and amplification factors of four shock absorbers of the same group with design values based on the vibration characteristics; if the error exceeds 5%, the determination is failed.
10. The method for screening an on-board electro-optic pod shock absorber according to claim 9, wherein if the shock absorber is a three-way equivalent stiffness shock absorber, the error is calculated by performing a weighted average calculation based on natural frequencies and amplification factors of four shock absorbers obtained from different vibration directions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265025.5A CN115655624A (en) | 2022-10-12 | 2022-10-12 | Screening device and screening method for airborne photoelectric shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211265025.5A CN115655624A (en) | 2022-10-12 | 2022-10-12 | Screening device and screening method for airborne photoelectric shock absorber |
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| Publication Number | Publication Date |
|---|---|
| CN115655624A true CN115655624A (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211265025.5A Pending CN115655624A (en) | 2022-10-12 | 2022-10-12 | Screening device and screening method for airborne photoelectric shock absorber |
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|---|---|
| CN (1) | CN115655624A (en) |
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- 2022-10-12 CN CN202211265025.5A patent/CN115655624A/en active Pending
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