An airborne optoelectronic pod shock absorber screening method

Abstract

The present invention belongs to the technical field of opto-mechanical alignment, and specifically relates to a screening method for airborne optoelectronic shock absorbers. It is used to realize the performance test of shock absorbers for airborne optoelectronic pods on a vibration table; the screening device for airborne optoelectronic pod shock absorbers includes an upper mounting seat of the screening device, a lower mounting seat of the screening device, a connecting pillar, a first acceleration sensor, a second acceleration sensor, an upper adapter block, and a lower adapter block; the present invention sets up a special tooling, which can greatly enhance the screening efficiency and screening accuracy of airborne optoelectronic shock absorbers, and avoid performance hidden dangers caused by inaccurate screening results.

Description

Technical Field

[0001] The present invention belongs to the technical field of opto-mechanical alignment, and particularly relates to a screening method for vibration dampers of airborne optoelectronic pods. Background Art

[0002] Existing vibration dampers of airborne optoelectronic pods do not have dedicated screening tools, and the screening means are single and the efficiency is low. Summary of the Invention

[0003] In view of this, the present invention proposes a screening method for vibration dampers of airborne optoelectronic pods, which sets up a dedicated tooling, can greatly enhance the screening efficiency and screening accuracy of airborne optoelectronic vibration dampers, and avoid performance hidden dangers caused by inaccurate screening results.

[0004] In order to achieve the above technical objectives, the specific technical solutions adopted by the present invention are as follows:

[0005] A screening method for vibration dampers of airborne optoelectronic pods, which is used to realize the performance test of vibration dampers for airborne optoelectronic pods on a vibration table, including an upper mounting seat of the screening device, a lower mounting seat of the screening device, connecting struts, a first acceleration sensor, a second acceleration sensor, an upper adapter block, and a lower adapter block. Among them, the two screening device mounting seats are connected and fastened based on four connecting struts to form a rigid screening vibration tooling; four groups of damper fixing holes are provided on the screening vibration tooling for fixing the four dampers; the upper adapter block and the lower adapter block form a rigid simulated load, the simulated load is arranged in the screening vibration tooling, and four groups of coupling holes are provided. During the test, the four groups of dampers are respectively fixed on the upper mounting seat and the lower mounting seat based on the respective fixing holes; each of the coupling holes is used to simulate the installation form and installation position of the airborne optoelectronic pod on each damper; the simulated load is used to simulate the load of the airborne optoelectronic pod on each damper;

[0006] The first acceleration sensor is used to collect the vibration characteristics of the screening vibration tooling, and the second acceleration sensor is used to collect the vibration characteristics of the simulated load. The method includes:

[0007] S101: Install the four dampers in the same group between four groups of mutually combined fixing holes and coupling holes;

[0008] S102: Apply vibration to the screening device of the airborne optoelectronic pod damper based on the vibration table, collect the measurement data of the first acceleration sensor and feedback it to the control system of the vibration table to realize the working condition vibration curve of the screening vibration tooling;

[0009] S103: Obtain the vibration characteristics of the simulated load based on the measurement data of the second acceleration sensor;

[0010] S104: Determine whether the four shock absorbers in the same group are qualified according to the vibration characteristics.

[0011] Furthermore, there are at least two of the first acceleration sensors; each of the two screening device mounts is equipped with at least one of the first acceleration sensors.

[0012] Furthermore, the second acceleration sensor is installed at a position close to the center of gravity of the simulation load.

[0013] Furthermore, the upper adapter block and the lower adapter block are provided with weight block mounting threaded holes; the weight block mounting threaded holes are used to fix the weight block; the simulation load is in an I shape.

[0014] Furthermore, the indicating directions of the first acceleration sensor and the second acceleration sensor are consistent with the vibration input direction of the vibration table.

[0015] Furthermore, the vibration input direction of the vibration table includes: the heading direction, the span direction, and the vertical direction.

[0016] Furthermore, the present invention also proposes an airborne optoelectronic pod shock absorber screening method completed based on the above airborne optoelectronic pod shock absorber screening device, including the following steps:

[0017] S101: Install the four shock absorbers in the same group between four groups of mutually combined fixing holes and mating holes;

[0018] S102: Apply vibration to the airborne optoelectronic pod shock absorber screening device based on the vibration table, collect the measurement data of the first acceleration sensor and feedback it to the control system of the vibration table to achieve the working condition vibration curve of the screening vibration tooling;

[0019] S103: Obtain the vibration characteristics of the simulation load based on the measurement data of the second acceleration sensor;

[0020] S104: Determine whether the four shock absorbers in the same group are qualified according to the vibration characteristics.

[0021] Furthermore, a pre-vibration step is also included between S101 and S102; the pre-vibration step is used to monitor whether the operating conditions of the airborne optoelectronic pod shock absorber screening device are normal driven by the vibration table.

[0022] Furthermore, in S104, the method for determining whether the shock absorber is qualified is: obtain the natural frequencies and magnification factors of the four shock absorbers in the same group based on the vibration characteristics and compare them with the design values; if the error exceeds 5%, it is determined as unqualified.

[0023] Further, when the shock absorber is a three-way equal-stiffness shock absorber, the error is obtained by weighted average calculation based on the natural frequencies and magnification factors of the four shock absorbers obtained in different vibration directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 is the front view of a screening device for airborne optoelectronic shock absorbers in a specific embodiment of the present invention;

[0026] Figure 2 is the sectional view taken along line B-B of a screening device for airborne optoelectronic shock absorbers in a specific embodiment of the present invention;

[0027] Figure 3 is the left view of a screening device for airborne optoelectronic shock absorbers in a specific embodiment of the present invention;

[0028] Figure 4 is the sectional view taken along line C-C of a screening device for airborne optoelectronic shock absorbers in a specific embodiment of the present invention;

[0029] Wherein: 1. Screening device mounting seat; 2. First connecting screw; 3. Connecting pillar; 4. Shock absorber; 5. First acceleration sensor; 6. Second acceleration sensor; 7. Upper adapter block; 8. Lower adapter block; 9. Set screw; 10. Second connecting screw; 11. Third connecting screw; 12. Nut; 13. Fourth connecting screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0031] The following illustrates the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present disclosure belong to the scope of protection of the present disclosure.

[0032] It should be noted that the following describes various aspects of embodiments within the scope of the appended claims. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on this disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement an apparatus and / or practice a method. Additionally, this apparatus can be implemented and this method can be practiced using other structures and / or functionality in addition to one or more of the aspects set forth herein.

[0033] It should also be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present disclosure schematically. The diagrams only show the components related to the present disclosure and are not drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0034] Furthermore, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the aspects can be practiced without these specific details.

[0035] In one embodiment of the present invention, an airborne optoelectronic pod shock absorber screening device is proposed, which is used to implement the performance test of the shock absorber 4 for the airborne optoelectronic pod on a vibration table;

[0036] As Figures 1-4 shown, it includes: a screening device upper mounting seat, a screening device lower mounting seat, connecting struts 3, a first acceleration sensor 5, a second acceleration sensor 6, an upper adapter block 7, and a lower adapter block 8;

[0037] Among them, two screening device mounting seats 1 are connected and fastened based on four connecting struts 3 to form a rigid screening vibration tooling;

[0038] Four groups of shock absorber fixing holes are provided on the screening vibration tooling for fixing four shock absorbers;

[0039] The upper adapter block 7 and the lower adapter block 8 form a rigid simulated load. The simulated load is arranged in the screening vibration tooling and is provided with four groups of coupling holes;

[0040] During the test, the four groups of shock absorbers are respectively fixed on the upper mounting seat and the lower mounting seat based on the respective fixing holes; each coupling hole is used to simulate the installation form and installation position of the airborne optoelectronic pod on each shock absorber; the simulated load is used to simulate the load of the airborne optoelectronic pod on each shock absorber;

[0041] The first acceleration sensor 5 is used to collect the vibration characteristics of the screening vibration tooling;

[0042] The second acceleration sensor 6 is used to collect the vibration characteristics of the simulated load.

[0043] In one embodiment, there are at least two first acceleration sensors; each of the two screening device mounts 1 is at least equipped with one first acceleration sensor.

[0044] In one embodiment, the second acceleration sensor is installed at a position close to the center of gravity of the simulated load.

[0045] In one embodiment, the upper adapter block 7 and the lower adapter block 8 are provided with threaded holes for installing counterweights; the threaded holes for installing counterweights are used to fix the counterweights; the simulated load is I-shaped.

[0046] In one embodiment, the indicating directions of the first acceleration sensor 5 and the second acceleration sensor 6 are consistent with the vibration input direction of the vibration table.

[0047] In one embodiment, the vibration input directions of the vibration table include: the heading direction, the span direction, and the vertical direction.

[0048] This embodiment includes a screening device mount 1, a first connecting screw 2, a connecting pillar 3, a shock absorber 4, a first acceleration sensor 5, a second acceleration sensor 6, an upper adapter block 7, a lower adapter block 8, a setscrew 9, a second connecting screw 10, a third connecting screw 11, a nut 12, and a fourth connecting screw 13.

[0049] The screening device mount 1 is in the shape of a flat plate and is rectangular, with U-shaped grooves on both sides for connecting to the vibration test table;

[0050] The connecting pillar 3 is columnar, with screw connection holes at both ends;

[0051] The shock absorber 4 is in the shape of two discs buckled together, with through holes around and in the middle;

[0052] The upper adapter block 7 is in the shape of a T-shaped plate. At both ends of the upper part of the T-shape, there are two large through holes, and there are four screw holes around the through holes; at the bottom of the T-shape, there are two rows of array countersunk through holes and two screw holes; in the middle of the T-shape, there are array screw holes;

[0053] The lower adapter block 8 is in the shape of a T-shaped plate, similar to the upper adapter block 7 in characteristics; the distance between the two screw holes at the bottom of its T-shape is different from that of the upper adapter block 8;

[0054] Among them, the two screening device mounts 1 and the four connecting pillars 3 are connected and fastened by the first connecting screw 2 to form a screening vibration tooling;

[0055] Two shock absorbers 4 and the upper adapter block 7 are fixedly connected by the third connecting screw 11. Then, the second connecting screw 10 is used to pass through the central hole of the shock absorber 4 and is fixedly connected to the upper side screening device mounting seat 1;

[0056] Two shock absorbers 4 and the lower adapter block 8 are fixedly connected by the third connecting screw 11; then, the second connecting screw 10 is used to pass through the central hole of the shock absorber 4 and is fixedly connected to the lower side screening device mounting seat 1;

[0057] After the above installation is completed, the upper adapter block 7 and the lower adapter block 8 are fixedly connected by the nut 12 and the fourth connecting screw 13;

[0058] Then, four setscrew bolts 9 are respectively installed on the front and back sides of the components composed of the upper adapter block 7 and the lower adapter block 8 by a torque wrench;

[0059] Among them, the upper adapter block 7, the lower adapter block 8, the setscrew bolts 9, the nut 12, and the fourth connecting screw 13 form a simulated load. The simulated load can hang a counterweight block at the screw hole in the middle thereof for performance screening of multiple types of shock absorbers 4. In this embodiment, the simulated load is in the shape of an I-beam, and it can also be in other shapes in different embodiments;

[0060] For the simulated load, the position dimensions of the four shock absorbers 4 installed thereon are the same as the actual situation; secondly, its natural frequency is not lower than 300 HZ;

[0061] There are two first acceleration sensors 5, which are respectively bonded at the upper and lower parts near the shock absorber 4 inside the screening vibration tooling; among them, the first acceleration sensor 5 is used to control the external vibration input;

[0062] The second acceleration sensor 6 is bonded at the center position of the simulated load; the second acceleration sensor 6 is used to output the response of the simulated load.

[0063] Among them, the indicating directions of the first acceleration sensor 5 and the second acceleration sensor 6 are consistent with the vibration input direction;

[0064] The installation method of the airborne optoelectronic shock absorber screening device in this embodiment is as follows: Two screening device mounting seats 1 and four connecting struts 3 are connected and fastened by the first connecting screw 2 to form a screening vibration tooling;

[0065] Two shock absorbers 4 and the upper adapter block 7 are fixedly connected by the third connecting screw 11. Then, the second connecting screw 10 is used to pass through the central hole of the shock absorber 4 and is fixedly connected to the upper side screening device mounting seat 1;

[0066] Two shock absorbers 4 and the lower adapter block 8 are fixedly connected by the third connecting screw 11; then, the second connecting screw 10 is used to pass through the central hole of the shock absorber 4 and is fixedly connected to the lower side screening device mounting seat 1;

[0067] After the above installation is completed, the upper adapter block 7 and the lower adapter block 8 are fixedly connected by the nut 12 and the fourth connecting screw 13;

[0068] Then, four setscrew bolts 9 are respectively installed on the front and back sides of the components formed by the upper adapter block 7 and the lower adapter block 8 by means of a torque wrench;

[0069] Based on the same inventive concept, the present invention also proposes an airborne optoelectronic pod shock absorber screening method completed based on the above-mentioned airborne optoelectronic pod shock absorber screening device, including the following steps:

[0070] S101: Install four shock absorbers of the same group between four groups of mutually combined fixing holes and coupling holes;

[0071] S102: Apply vibration to the airborne optoelectronic pod shock absorber screening device based on a vibration table, collect the measurement data of the first acceleration sensor 5 and feedback it to the control system of the vibration table to realize the working condition vibration curve for the screening vibration tooling;

[0072] S103: Obtain the vibration characteristics of the simulated load based on the measurement data of the second acceleration sensor 6;

[0073] S104: Judge whether the four shock absorbers of the same group are qualified according to the vibration characteristics.

[0074] In one embodiment, a pre-vibration step is further included between S101 and S102; the pre-vibration step is used to monitor whether the operating conditions of the airborne optoelectronic pod shock absorber screening device are normal under the drive of the vibration table.

[0075] In one embodiment, in S104, the method for judging whether the shock absorber is qualified is: obtaining the natural frequency and magnification factor of the four shock absorbers of the same group based on the vibration characteristics and comparing them with the design values; if the error exceeds 5%, it is determined as unqualified.

[0076] In one embodiment, when the shock absorber is a three-way equal-stiffness shock absorber, the error is obtained by weighted average calculation based on the natural frequency and magnification factor of the four shock absorbers obtained in different vibration directions.

[0077] In this embodiment, when the shock absorber screening experiment starts, the external vibration input is controlled by two first acceleration sensors 5, and the response curve of the simulated load is read by the second acceleration sensor 6;

[0078] Generally, the vibration absorber screening of general airborne optoelectronic products requires vibration tests simulating the vibration of an aircraft in three directions. During the screening test in a certain direction, usually, the vibration test is carried out according to the predetermined vibration curve for 3 minutes first. If the test is normal, then the vibration starts for 10 minutes, and the second acceleration sensor 6 outputs the response curve of the simulated load. When the vibration test in one direction is completed, it is necessary to remove and re-bond the first acceleration sensor 5 and the second acceleration sensor 6 to ensure that the direction of the acceleration sensor is consistent with the vibration direction.

[0079] After the vibration tests in three directions are completed; the data of the natural frequency and magnification factor of the vibration absorber 4 in three directions are respectively obtained through the second acceleration sensor 6. For a vibration absorber with equal stiffness in three directions, it is necessary to calculate the natural frequency and magnification factor of the vibration absorber 4 respectively through weighted average. If the error of its natural frequency and magnification factor is within 5%, it is determined to be qualified; if it exceeds, it needs to be excluded.

[0080] If the stiffness of the vibration absorber 4 is inconsistent in three directions, it is necessary to compare the three groups of data with the natural frequency and magnification factor of the vibration absorber 4 in three directions respectively. If the error of its natural frequency and magnification factor is within 5%, it is determined to be qualified; if it exceeds, it needs to be excluded.

[0081] As described above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present disclosure should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An airborne optoelectronic pod shock absorber screening method, which is used to realize the performance test of shock absorbers for airborne optoelectronic pods on a vibration table, is characterized in that It includes the upper mounting seat of the screening device, the lower mounting seat of the screening device, connecting struts, a first acceleration sensor, a second acceleration sensor, an upper adapter block, and a lower adapter block. Among them, the two screening device mounting seats are connected and fastened based on four connecting struts to form a rigid screening vibration tooling; four groups of shock absorber fixing holes are provided on the screening vibration tooling for fixing the four shock absorbers; the upper adapter block and the lower adapter block form a rigid simulated load, and the simulated load is arranged in the screening vibration tooling and is provided with four groups of coupling holes. During testing, the four groups of shock absorbers are respectively fixed on the upper mounting seat and the lower mounting seat based on the respective fixing holes; each of the coupling holes is used to simulate the installation form and installation position of the airborne optoelectronic pod on each shock absorber; the simulated load is used to simulate the load of the airborne optoelectronic pod on each shock absorber. The first acceleration sensor is used to collect the vibration characteristics of the screening vibration tooling, and the second acceleration sensor is used to collect the vibration characteristics of the simulated load. The method includes: S101: Install the four shock absorbers in the same group between four groups of mutually combined fixing holes and coupling holes. S102: Apply vibration to the screening device of the airborne optoelectronic pod shock absorber based on the vibration table, collect the measurement data of the first acceleration sensor and feedback it to the control system of the vibration table to obtain the working condition vibration curve of the screening vibration tooling. S103: Obtain the vibration characteristics of the simulated load based on the measurement data of the second acceleration sensor. S104: Determine whether the four shock absorbers in the same group are qualified according to the vibration characteristics.

2. The screening method for the airborne optoelectronic pod shock absorber according to claim 1, characterized in that There are at least two first acceleration sensors; at least one first acceleration sensor is installed on each of the two screening device mounting seats.

3. The screening method for the airborne optoelectronic pod shock absorber according to claim 2, wherein The second acceleration sensor is installed at a position close to the center of gravity of the simulated load.

4. The screening method for the airborne optoelectronic pod shock absorber according to claim 3, characterized in that, Weight block mounting threaded holes are provided on the upper adapter block and the lower adapter block; the weight block mounting threaded holes are used to fix weight blocks; the simulated load is in an I shape.

5. The screening method for the airborne optoelectronic pod shock absorber according to claim 4, wherein The indicating directions of the first acceleration sensor and the second acceleration sensor are consistent with the vibration input direction of the vibration table.

6. The screening method for the airborne optoelectronic pod shock absorber according to claim 5, characterized in that, The vibration input direction of the vibration table includes: the heading direction, the span direction, and the vertical direction.

7. The screening method for the airborne optoelectronic pod shock absorber according to claim 1, characterized in that, A pre-vibration step is also included between S101 and S102; the pre-vibration step is used to monitor whether the operating conditions of the screening device of the airborne optoelectronic pod shock absorber are normal under the drive of the vibration table.

8. The screening method for the airborne optoelectronic pod shock absorber according to claim 7, characterized in that, In S104, the method for determining whether the shock absorber is qualified is: obtain the natural frequencies and magnification factors of the four shock absorbers in the same group based on the vibration characteristics and compare them with the design values; if the error exceeds 5%, it is determined as unqualified.

9. The screening method for the airborne optoelectronic pod shock absorber according to claim 8, characterized in that When the shock absorber is a three-way equal-stiffness shock absorber, the error is obtained by weighted average calculation based on the natural frequencies and magnification factors of the four shock absorbers obtained in different vibration directions.

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