SY/T 5582-1993 Basic environmental test for petroleum exploration and development instruments Test N: Broadband random vibration test method
Some standard content:
Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T5582-93
Basic environmental test test N for petroleum exploration and development instruments: Broadband random vibration test method
Published on March 27, 1993
Ministry of Energy of the People's Republic of China
Implementation on September 1, 1993
Petroleum and Natural Gas Industry Standard of the People's Republic of China Basic environmental test test N for petroleum exploration and development instruments: Broadband random vibration test method
SY/T 5582-93
This standard is equivalent to 1FC68-2-3468-2-35: 68-2-36, 68-2-37 broadband random vibration standards, and is also the national standard GB2423.11, 2423.12, 2423.132423.14 broadband random vibration test method in this industry. 1 Subject content and applicable scope
This standard specifies the conditions for broadband random vibration test. The test severity level, test method and test-related requirements. This standard applies to petroleum exploration and development instruments. Broadband random vibration test is carried out during the design, manufacture, finalization and acceptance process. 2 Reference standards
GB2428.11 Broadband random vibration test method - general requirements GB2423.12 Broadband random vibration test method - high reproducibility GB2423.13 Broadband random vibration test method - medium reproducibility GB2423.14 Broadband random vibration test method - m2 - low reproducibility SY/T5203 General principles for basic environmental tests of petroleum exploration and development instruments 3 Terminology
3.1 Acceleration spectral density (written as ASD) is the spectral (energy) density of vibration acceleration variables, in units of: g\/Hz (acceleration per unit frequency squared).
3.2 Spectrum of acceleration spectral density, the form in which the acceleration spectral density value changes within the frequency range. It is a graph of vibration amplitude changing according to frequency, which is called spectrum.
Within the specified frequency range, the spectrum when ASD is equal (overall average value) is called flat spectrum. This standard promotes the test using flat spectrum. 3.3 Reproducibility: The reproducibility referred to in this standard does not refer to the reproducibility between the test and the actual environment, but refers to the similarity (consistency) of the results obtained when the same test sample is tested under different conditions, that is, different operators; different test equipment, different time and place, according to the same test requirements. The reproducibility of random vibration test is also the accuracy that can be controlled during random vibration test. In order to meet different test needs, reproducibility is divided into three levels: high, medium and low, and each level has different tolerance regulations. 4 Test conditions
For broadband random vibration test, different test conditions should be selected according to the actual transportation and use conditions that the product may encounter, as well as different acceptance requirements (such as product design, production finalization, production inspection, reliability test, etc.) to achieve the corresponding test accuracy. 4.1 Test severity level
4.1.1 Test severity level is determined by the following parameters: a. Frequency range fif2 (unit: Hz)
Approved by the Ministry of Energy of the People's Republic of China on March 27, 1993 and implemented on September 1, 1993
SY/T 5582--93
b: Acceleration spectrum density ASD (unit: g\/Hz) c. Duration of conditional test t (unit: min) 4.1.2 The test frequency range and acceleration spectrum density level jointly determine the total root mean square acceleration value valid for the test, which corresponds to the acceleration spectrum density level. When the test conditions exceed the requirements of this standard, the total root mean square acceleration value corresponding to the acceleration spectrum density level shall comply with the provisions of the national standard GB2423,11.
4.2 Environmental condition test grouping and requirements
The environmental condition test grouping of petroleum exploration and development instruments is divided into six groups according to the provisions of standard SY/T5203. The requirements of grouping test are shown in Qiu I
Frequency range, Hz
Acceleration spectrum density, g/Hz
Total root mean square velocity (g)
Test duration, min
a. Production inspection test
b. Design finalization test
Instrument working state
4.3 Test reproducibility selection and grade regulationsbzxZ.net
Not working
Working or not working
4.3.1 High reproducibility test can give a very high reproducibility, but also requires high control accuracy. It must have advanced and expensive test control equipment, otherwise it will require a long time of additional measurement and complex verification. Therefore, high reproducibility test is selected unless there is a special need (for example, when doing reliability test in important new product design). 4.3.2 For the test of petroleum instrumentation products, medium and low reproducibility tests are usually selected to meet the requirements and are relatively economical. 4.3.3 The degree of reproducibility mainly depends on the tolerance of the actual test value of the acceleration spectrum density (usually expressed as V), that is, the control accuracy of the acceleration spectrum density value V during the random motion test process. Within the specified frequency range (1~f2), the tolerance requirements of the acceleration spectrum density are as follows:
a For high reproducibility test, the tolerance of the V value shall not exceed 3dBb. For medium reproducibility test, the tolerance of the N value shall not exceed 6dBc. For low reproducibility test, the tolerance of the N value is not specified. The frequency spectrum relationship of the acceleration spectral density is shown in the figure below: ASD4
+ GtiB-
.-*+++.
[Logarithmic scale
6dB/oct
212H2)
N-the actual test value (true value) of the specified acceleration spectral density ASD: H, H,-the upper and lower limits of the high reproducibility ASD tolerance: M, M-the upper and lower limits of the medium reproducibility ASD tolerance: f, f-the upper and lower limits of the specified frequency range2
SY/T5582--93
4,3.4 Reproducibility requirements t
a, high reproducibility, requiring that within the f2~2f2 frequency band, the ASD spectrum should be narrow, and should have a slope of at least ±6dB/oct. In the frequency band of f2 to 10/2, the total RMS acceleration value shall not exceed 25% (-12dB) of the total RMS acceleration value required within the specified frequency range. b. Medium reproducibility: In the frequency band of 2 to 2f2, the spectrum width of ASD is not specified. In the frequency band of f2 to 10f, the total RMS acceleration shall not exceed 70% (-3dB) of the total RMS acceleration value required within the specified frequency range. c. Low reproducibility, ASD and total RMS acceleration value, changes after the frequency exceeds "2: are not specified. 5 Test steps || tt || 5.1 Installation and control of test samples (hereinafter referred to as samples) 5.1.1 The sample should be placed directly on the vibration test bench and fastened and installed using a special test fixture or other rigid connection method for the test bench. 5.1.2 No additional vibration reduction measures shall be taken during the test unless the sample itself has a vibration damper. 5.1.3 Samples with vibration dampers can be tested together with the vibration dampers. If necessary, testing without vibration dampers should also be considered, and the vibration test can be appropriately reduced during the test. The severity level is determined in order to verify the minimum strength of the random perturbation that the specimen itself can withstand. 5.1.4 Select appropriate random fixed points and control points. 5.1.4.1 Fixed point: refers to the contact part between the specimen and the fixture or vibration table. The clamping must ensure that the vibration transmission received by the specimen through the fixed point is consistent with the vibration table. The number of fixed points must not be less than 4. 5.1.4.2 Control point: refers to the position where the vibration signal is detected and fed back during the test. It is usually selected near the fixed point, or one of the fixed points. The control point must be a rigid connection. After selecting reasonable fixed points and control points , fasten the sample to the vibration table. For large and complex samples, some reference points may also be selected. The selection of reference points can refer to the provisions of GB2423.11~～14. 5.2 Frequency characteristic measurement and response inspection of the sample 5.2.1 For samples subjected to random vibration tests, the frequency characteristic measurement and response inspection of the sample should be carried out using sinusoidal vibration first, so as to understand the resonance that may cause mechanical failure and performance loss in the specified frequency range of the sample, and understand the dangerous frequency points of resonance, so as to take effective countermeasures.
5.2.2 Frequency characteristic measurement and response inspection of the sample Inspection is to use a sine wave to sweep forward and backward within the specified frequency range, and observe the frequency characteristics and resonance response of the sample through the sweep. The sine amplitude used for the sweep shall not exceed 9.8m/s2 (1g). During the sweep, if resonance occurs and electromechanical failure may occur, the sweep shall be interrupted. 5.3 Initial inspection
Refers to the inspection before the random vibration test according to the product standard (usually it can also be inspected before the product is installed on the vibration table). 5.3.1 Check the appearance and mechanical structure.
5.3.2 Electrical performance (or function) test.
6.4 Test start excitation
Before conducting a random vibration test of the specified severity level, a random start excitation with a lower vibration amplitude should be conducted. The amplitude of the start excitation should be kept to a minimum, the vibration interval should be as short as possible, and the allowable start excitation time should comply with the following provisions. 5.4.1 When the severity level of the start excitation is less than 25% of the specified level, there is no limit on the start excitation interval. 5.4.2 When the severity level of the start excitation is 25%-50% of the specified level, the start excitation time should not be greater than 1.5 times the specified test time.
.54.3 When the severity level of the start excitation is 50%~100% of the specified level, the start excitation time should not be greater than 10% of the specified test time.
5.5 Test
5.5.1 After the start excitation is successful and reaches the specified severity level, the test has entered the random vibration state of the specified level until the specified test time ends [1.
SY/T5582-93
5.5.2Usually, the test shall be conducted in three mutually perpendicular directions, and the test time can be evenly distributed in the three directions according to the specified total time. The downhole instrument of the logging instrument only needs to be tested in one direction (lateral direction of the downhole instrument). This standard recommends a test procedure (see Appendix A) that simulates the working process of the logging instrument for reference when testing the downhole instrument of the logging instrument. 5.5.3During the test, the specimen works or does not work, as specified in Table 1 or specified by the product standard. 5.5.4During the test, the acceleration spectrum density and the total root mean square acceleration value of the test shall be detected and controlled within the specified frequency range according to the selected reproducibility level, and shall comply with the provisions of Table 1. The tolerance requirements are shown in Table 2. Table 2
Reproducibility
True value of acceleration spectrum density
Note: The analytical instrument used for measurement is required to have an indication error of no more than ±3dB during the low reproducibility test. 5.6 Final test
True value of total RMS acceleration
After the test, the appearance and structure shall be inspected, and the performance (or function) test shall be carried out, which shall meet the technical requirements specified in the product standard.
6 Verification of acceleration spectrum density
According to the requirements of constant reproducibility, the verification method proposed in GB2423.12: CB2423.13 and GB2423.14 shall be referred to respectively. The random vibration test equipment with computer control shall be used. During the test, the acceleration spectrum density value has been directly displayed or printed out by the terminal of the computer system, and no additional verification is required. Test report
7.1 The test results shall be compiled into a test report in accordance with the relevant provisions of 5Y/T5203. 7.2 The test report shall also include:
a: Records of initial test, intermediate test, and final test results of the sample, b. Faults and treatments during the test C. Records of random vibration parameters (acceleration spectrum density, frequency range, and test time). 4
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SY/T5582-93
A
A recommended test procedure diagram for logging instrument (reference part)
Figure A-1
The simulated logging procedure diagram is divided into seven intervals (see a-1 to b-2 in Figure A-1), simulating the following actual logging work process a. Indoor preparation, initial inspection, instrument operation b. On the way from the base to the well site, the instrument does not work, c: The instrument is lowered into the well after calibration, the instrument works, d: Well logging, instrument operation, e: After the measurement is completed, the instrument is lifted up, the instrument does not work, and on the way back to the well site, the instrument does not work. g. Indoor calibration at the base, final inspection, instrument operation. Additional remarks:
This standard is proposed and managed by the Petroleum Instrument and Meter Professional Standardization Committee. This standard is drafted by Xi'an Petroleum Exploration Instrument Factory. The main drafter of this standard is Xu Huasheng.
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