A method and device for designing a test condition of a sine vibration test of an accumulator bellows

Abstract

The application provides a kind of accumulator membrane box sine vibration test condition design method and device, comprising: obtaining the low-frequency vibration acceleration flight telemetry time domain data of accumulator membrane box and accumulator shell installation interface;Select typical transient time domain data segment to carry out low-frequency band-pass filtering, and the filtered data is processed by impact response spectrum equivalent sine;The data is processed by maximum envelope;According to the impact response spectrum equivalent sine envelope data of typical transient time, design acceptance level sine vibration test condition;Based on acceptance level sine vibration test condition, determine the identification level sine vibration test condition, complete accumulator membrane box sine vibration test condition design.The sine vibration test condition of the accumulator membrane box is obtained by the design when the ground vibration test is carried out alone, which can improve the over-test condition of the accumulator membrane box caused by the ground vibration test of the accumulator as a whole, and reduce the structure design difficulty and ground over-test risk of the accumulator membrane box.

Description

Technical Field

[0001] This invention belongs to the field of launch vehicle technology, and specifically relates to a method and apparatus for designing sinusoidal vibration test conditions for accumulator diaphragm boxes. By designing sinusoidal vibration test conditions for accumulator diaphragm boxes to conduct ground vibration tests independently, the invention can improve the overtesting situation of accumulator diaphragm boxes caused by ground vibration tests of the accumulator as a whole, and reduce the structural design difficulty and risk of overtesting of accumulator diaphragm boxes. Background Technology

[0002] Accumulators are crucial components of a launch vehicle's propulsion system. During the active flight phase, they are subjected to low-frequency (2–100 Hz) vibrations generated during typical transient moments such as engine ignition, booster separation, and stage separation. Therefore, the structural design of the accumulator requires corresponding mechanical environmental analysis based on the low-frequency vibration conditions provided by the overall launch system design, and must be validated through ground-based mechanical tests to ensure the accumulator's adaptability to the corresponding low-frequency vibration environment during flight. Thus, the rationality of the sinusoidal vibration test conditions provided by the overall launch system design significantly impacts the accumulator's design and development.

[0003] Launch vehicle design typically involves low-frequency (2–100 Hz) vibration testing based on the interface between the accumulator casing's lower end face and the rocket body. Since the accumulator is installed at the engine propellant inlet, it is subjected to continuous excitation throughout engine operation, resulting in a harsh mechanical environment. After the accumulator design is completed, ground vibration tests are required to verify its performance under the low-frequency vibration conditions specified by the launch vehicle design. Due to differences in the constraint boundaries between ground and flight conditions, the response amplification of critical internal locations relative to the lower end face of the casing is significantly greater under ground vibration testing than under flight conditions. This is especially true for the crucial diaphragm assembly, which is extremely sensitive to vibration; excessive vibration excitation can easily lead to structural damage. Therefore, the diaphragm assembly exhibits severe over-testing under current test conditions, further complicating its design. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, the inventors have conducted intensive research and provided a method and device for designing sinusoidal vibration test conditions for accumulator diaphragm boxes. By designing sinusoidal vibration test conditions for accumulator diaphragm boxes to be tested on the ground independently, the invention improves the overtesting situation of accumulator diaphragm boxes caused by the overall accumulator being tested on the ground, and reduces the structural design difficulty of accumulator diaphragm boxes and the risk of overtesting on the ground.

[0005] The technical solution provided by this invention is as follows:

[0006] In a first aspect, a method for designing test conditions for sinusoidal vibration of an accumulator diaphragm includes the following steps:

[0007] Based on the flight telemetry data of the launch vehicle, the flight telemetry time domain data of low-frequency vibration acceleration at the installation interface between the accumulator diaphragm and the accumulator shell were obtained.

[0008] Based on the time-domain data of low-frequency vibration acceleration flight telemetry at the installation interface between the accumulator diaphragm and the accumulator housing, a typical transient moment time-domain data segment was selected for low-frequency bandpass filtering, and the filtered data was processed into an equivalent sine wave of the impact response spectrum.

[0009] The equivalent sinusoidal data of the impact response spectrum at typical transient moments are processed by maximum envelope;

[0010] Based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, the vibration acceleration measurement level of the acceptance-level sinusoidal vibration test is designed, and the acceptance-level sinusoidal vibration scanning rate is determined.

[0011] Multiply the vibration acceleration measure of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure of the qualification-level sinusoidal vibration test, and determine the qualification-level sinusoidal vibration scanning rate to complete the design of the sinusoidal vibration test conditions for the accumulator diaphragm.

[0012] Secondly, a device for designing sinusoidal vibration test conditions for an accumulator diaphragm includes:

[0013] The first module is used to obtain the time-domain data of low-frequency vibration acceleration at the installation interface between the accumulator diaphragm and the accumulator shell based on the flight telemetry data of the launch vehicle.

[0014] The second module is used to select time-domain data segments of typical transient moments for low-frequency bandpass filtering based on the low-frequency vibration acceleration flight telemetry time-domain data of the accumulator diaphragm and accumulator housing installation interface, and then perform equivalent sine processing on the impact response spectrum of the filtered data.

[0015] The third module is used to perform maximum envelope processing on the equivalent sinusoidal data of the impact response spectrum at typical transient moments.

[0016] The fourth module is used to design the vibration acceleration measurement level of the acceptance-level sinusoidal vibration test based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, and to determine the acceptance-level sinusoidal vibration scanning rate.

[0017] The fifth module is used to multiply the vibration acceleration measure level of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure level of the qualification-level sinusoidal vibration test, and to determine the qualification-level sinusoidal vibration scan rate.

[0018] Thirdly, an apparatus for designing sinusoidal vibration test conditions for an accumulator diaphragm is characterized by comprising:

[0019] One or more processors;

[0020] Storage device for storing one or more programs.

[0021] When the one or more programs are executed by the one or more processors, the one or more processors implement the accumulator diaphragm sinusoidal vibration test condition design method described in the first aspect.

[0022] Fourthly, a readable storage medium is characterized in that it stores a computer program thereon, which, when executed by a processor, implements the method for designing sinusoidal vibration test conditions for accumulator diaphragm as described in the first aspect.

[0023] The method and apparatus for designing sinusoidal vibration test conditions for an accumulator diaphragm provided by the present invention have the following beneficial effects:

[0024] This invention provides a method and apparatus for designing sinusoidal vibration test conditions for an accumulator diaphragm. The method involves performing bandpass filtering (2-100Hz) on the low-frequency vibration acceleration time-domain data of the accumulator diaphragm-housing interface during typical transient moments, followed by equivalent sinusoidal processing of the impact response spectrum. The resulting equivalent sinusoidal impact response spectrum data at typical transient moments is then subjected to maximum envelope processing. Based on this envelope data, the conditions for acceptance-level and qualification-level sinusoidal vibration tests are designed. This invention, by designing sinusoidal vibration test conditions for the accumulator diaphragm during individual ground vibration tests, can improve the accumulator diaphragm over-testing situation caused by conducting ground vibration tests on the entire accumulator, reducing the structural design difficulty of the accumulator diaphragm and the risk of over-testing on the ground. Attached Figure Description

[0025] Figure 1 This is a flowchart of the design method for sinusoidal vibration test conditions of accumulator diaphragm box;

[0026] Figure 2 It is the time-domain curve of low-frequency vibration acceleration at the interface between the diaphragm box and the accumulator shell of the first-stage accumulator of the launch vehicle.

[0027] Figure 3 These are the equivalent sinusoidal data curves of the impact response spectrum at various typical transient moments;

[0028] Figure 4 These are the maximum envelope curves of the equivalent sinusoidal data of the impact response spectrum at various typical transient moments;

[0029] Figure 5 It is the sinusoidal vibration test condition curve for the accumulator diaphragm box acceptance level;

[0030] Figure 6 It is the sinusoidal vibration test condition curve for the accumulator diaphragm box qualification / acceptance level. Detailed Implementation

[0031] The features and advantages of the present invention will become clearer and more apparent from the following detailed description.

[0032] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0033] This invention provides a method for designing test conditions for sinusoidal vibration of an accumulator diaphragm, such as... Figure 1 As shown, it includes the following steps:

[0034] Step 1: Based on the launch vehicle flight telemetry data, obtain the time-domain data of low-frequency vibration acceleration at the interface between the accumulator diaphragm and the accumulator housing. The specific implementation steps are as follows: In this example, based on the launch vehicle flight telemetry data, obtain the time-domain data of low-frequency vibration acceleration at the interface between the core-stage accumulator diaphragm and the accumulator housing measured by a low-frequency vibration sensor (2-100Hz). Perform preprocessing to remove jump points and center terms. The resulting time-domain data curve is shown below. Figure 2 As shown.

[0035] Step 2: Based on the low-frequency vibration acceleration flight telemetry time-domain data of the accumulator diaphragm and accumulator housing installation interface obtained in Step 1, select typical transient moments (such as engine ignition, engine shutdown, booster separation, and interstage separation) and perform 2-100Hz bandpass filtering on the time-domain data segments. Then, perform equivalent sine processing on the impact response spectrum of the filtered data.

[0036] The specific implementation steps are as follows: According to Figure 2 The time-domain data shown uses the first-stage engine ignition characteristic period data and shutdown characteristic period data as typical transient moments for analysis. In this example, the first-stage engine ignition characteristic period is -1s to 6s, and the shutdown characteristic period is 237s to 242s. After applying a 2-100Hz bandpass filter to the selected first-stage engine ignition characteristic period data and shutdown characteristic period data, the recursive digital filtering method in Appendix K of "GJB2238A_2004 Telemetry Data Processing" is used to perform impulse response spectrum analysis on the bandpass-filtered data. Then, the impulse response spectrum data at each frequency point is divided by Q (Q=10) to complete the equivalent sine processing of the impulse response spectrum of the filtered data. The resulting equivalent sine data curves of the impulse response spectrum at each typical transient moment are shown below. Figure 3 As shown.

[0037] Step 3: Based on the equivalent sinusoidal data of the impact response spectrum at typical transient moments obtained in Step 2, perform maximum envelope processing. The specific implementation steps are as follows: Take the maximum value at each same frequency for the equivalent sinusoidal data of the impact response spectrum at each typical transient moment obtained in Step 2, and obtain the maximum envelope curve of the equivalent sinusoidal data of the impact response spectrum at typical transient moments, as shown below. Figure 4 As shown.

[0038] Step 4: Based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments obtained in Step 3, design the vibration acceleration order of the acceptance-level sinusoidal vibration test (e.g., 0.5g at 2Hz, 2g at 60Hz, 3g at 61Hz, and 3g at 100Hz), and obtain the frequency-vibration acceleration order curve of the acceptance-level sinusoidal vibration test accordingly. The scanning rate of the acceptance-level sinusoidal vibration is specified as 4 oct / min.

[0039] The specific implementation steps are as follows: Based on the maximum envelope of the equivalent sinusoidal data of the impact response spectrum at typical transient moments, and considering a certain engineering margin, the vibration acceleration level of the acceptance-grade sinusoidal vibration test and the frequency-vibration acceleration level curve of the acceptance-grade sinusoidal vibration test are designed, such as... Figure 5 As shown, the acceptance-level sinusoidal vibration scanning rate is specified as 4 oct / min.

[0040] Step 5: Multiply the vibration acceleration magnitude of the acceptance-level sinusoidal vibration test obtained in Step 4 by a safety factor of 1.5 to 2 to obtain the vibration acceleration magnitude of the qualification-level sinusoidal vibration test. The frequency-vibration acceleration magnitude curve for the qualification-level sinusoidal vibration test is then obtained, and the scanning rate for the qualification-level sinusoidal vibration is specified as 1 to 2 oct / min. The specific implementation steps are as follows: In this example, a safety factor of 2 is used as the qualification margin. The magnitude of the designed acceptance-level sinusoidal vibration test is multiplied by a factor of 2 to obtain the magnitude of the qualification-level sinusoidal vibration test. Figure 6 As shown. In this example, the identification-grade sinusoidal vibration scanning rate is specified as 1 oct / min.

[0041] The present invention also provides a device for designing sinusoidal vibration test conditions for an accumulator diaphragm, comprising:

[0042] The first module is used to obtain the time-domain data of low-frequency vibration acceleration at the installation interface between the accumulator diaphragm and the accumulator shell based on the flight telemetry data of the launch vehicle.

[0043] The second module is used to select time-domain data segments of typical transient moments for low-frequency bandpass filtering based on the low-frequency vibration acceleration flight telemetry time-domain data of the accumulator diaphragm and accumulator housing installation interface, and then perform equivalent sine processing on the impact response spectrum of the filtered data.

[0044] The third module is used to perform maximum envelope processing on the equivalent sinusoidal data of the impact response spectrum at typical transient moments.

[0045] The fourth module is used to design the vibration acceleration measurement level of the acceptance-level sinusoidal vibration test based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, and to determine the acceptance-level sinusoidal vibration scanning rate.

[0046] The fifth module is used to multiply the vibration acceleration measure level of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure level of the qualification-level sinusoidal vibration test, and to determine the qualification-level sinusoidal vibration scan rate.

[0047] This invention also provides a device for designing sinusoidal vibration test conditions for an accumulator diaphragm, comprising:

[0048] One or more processors;

[0049] Storage device for storing one or more programs.

[0050] When the one or more programs are executed by the one or more processors, the one or more processors implement the accumulator diaphragm sinusoidal vibration test condition design method described in the first aspect.

[0051] The present invention also provides a readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for designing sinusoidal vibration test conditions for accumulator diaphragm as described in the first aspect.

[0052] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, equipment, and readable storage media described above can be referred to the corresponding processes in the aforementioned methods, and will not be repeated here.

[0053] The apparatus, device, and readable storage medium technical solutions of this application, in essence, or in terms of their contribution to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0054] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0055] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

[0056] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A method for designing test conditions for sinusoidal vibration of an accumulator diaphragm, characterized in that, Includes the following steps: Based on the flight telemetry data of the launch vehicle, the flight telemetry time domain data of low-frequency vibration acceleration at the installation interface between the accumulator diaphragm and the accumulator shell were obtained. Based on the time-domain data of low-frequency vibration acceleration flight telemetry at the installation interface between the accumulator diaphragm and the accumulator housing, a typical transient moment time-domain data segment was selected for low-frequency bandpass filtering, and the filtered data was processed into an equivalent sine wave of the impact response spectrum. The equivalent sinusoidal data of the impact response spectrum at typical transient moments are processed by maximum envelope; Based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, the vibration acceleration measurement level of the acceptance-level sinusoidal vibration test is designed, and the acceptance-level sinusoidal vibration scanning rate is determined. Multiply the vibration acceleration measure of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure of the qualification-level sinusoidal vibration test, and determine the qualification-level sinusoidal vibration scanning rate to complete the design of the sinusoidal vibration test conditions for the accumulator diaphragm.

2. The method for designing test conditions for sinusoidal vibration of the accumulator diaphragm according to claim 1, characterized in that, In the step of selecting a typical transient moment time domain data segment for low-frequency bandpass filtering, a typical transient moment time domain data segment is selected for 2-100Hz low-frequency bandpass filtering.

3. The method for designing test conditions for sinusoidal vibration of the accumulator diaphragm according to claim 1, characterized in that, The step of performing equivalent sinusoidal processing of the impulse response spectrum of the filtered data is implemented in the following manner: the recursive digital filtering method in Appendix K of "GJB 2238A_2004 Telemetry Data Processing" is used to perform impulse response spectrum analysis on the bandpass filtered data, and then the impulse response spectrum data of each frequency point is divided by Q, where Q=10, to complete the equivalent sinusoidal processing of the impulse response spectrum of the filtered data.

4. The method for designing test conditions for sinusoidal vibration of the accumulator diaphragm according to claim 1, characterized in that, The step of performing maximum envelope processing on the equivalent sinusoidal data of the impact response spectrum at typical transient moments is implemented in the following way: the maximum value of the equivalent sinusoidal data of the impact response spectrum at each typical transient moment is taken at each same frequency to obtain the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments.

5. The method for designing test conditions for sinusoidal vibration of an accumulator diaphragm according to claim 1, characterized in that, In the step of designing the vibration acceleration level of the acceptance-level sinusoidal vibration test based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, and determining the acceptance-level sinusoidal vibration scanning rate, the acceptance-level sinusoidal vibration scanning rate is 4 oct / min.

6. The method for designing test conditions for sinusoidal vibration of an accumulator diaphragm according to claim 1, characterized in that, In the step of multiplying the vibration acceleration measure of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure of the qualification-level sinusoidal vibration test, and determining the qualification-level sinusoidal vibration scanning rate to complete the design of the sinusoidal vibration test conditions for the accumulator diaphragm, the safety factor is 1.5 to 2 times.

7. The method for designing test conditions for sinusoidal vibration of an accumulator diaphragm according to claim 1, characterized in that, In the step of multiplying the vibration acceleration measure of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure of the qualification-level sinusoidal vibration test, and determining the qualification-level sinusoidal vibration scanning rate to complete the design of the sinusoidal vibration test conditions for the accumulator diaphragm, the qualification-level sinusoidal vibration scanning rate is 1 to 2 oct / min.

8. A device for designing sinusoidal vibration test conditions for an accumulator diaphragm, characterized in that, include: The first module is used to obtain the time-domain data of low-frequency vibration acceleration at the installation interface between the accumulator diaphragm and the accumulator shell based on the flight telemetry data of the launch vehicle. The second module is used to select time-domain data segments of typical transient moments for low-frequency bandpass filtering based on the low-frequency vibration acceleration flight telemetry time-domain data of the accumulator diaphragm and accumulator housing installation interface, and then perform equivalent sine processing on the impact response spectrum of the filtered data. The third module is used to perform maximum envelope processing on the equivalent sinusoidal data of the impact response spectrum at typical transient moments. The fourth module is used to design the vibration acceleration measurement level of the acceptance-level sinusoidal vibration test based on the equivalent sinusoidal envelope data of the impact response spectrum at typical transient moments, and to determine the acceptance-level sinusoidal vibration scanning rate. The fifth module is used to multiply the vibration acceleration measure level of the acceptance-level sinusoidal vibration test by a safety factor to obtain the vibration acceleration measure level of the qualification-level sinusoidal vibration test, and to determine the qualification-level sinusoidal vibration scan rate.

9. A device for designing sinusoidal vibration test conditions for an accumulator diaphragm, characterized in that, include: One or more processors; Storage device for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement the accumulator diaphragm sinusoidal vibration test condition design method according to any one of claims 1 to 8.

10. A readable storage medium, characterized in that, It stores a computer program that, when executed by a processor, implements the method for designing sinusoidal vibration test conditions for an accumulator diaphragm as described in any one of claims 1 to 8.

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