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GB/T 2423.58-2008: Environmental testing for electric and electronic products - Part 2: Test methods - Test Fi: Vibration - Mixed mode
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Environmental testing for electric and electronic products - Part 2: Test methods - Test Fi: Vibration - Mixed mode
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Basic data | Standard ID | GB/T 2423.58-2008 (GB/T2423.58-2008) | | Description (Translated English) | Environmental testing for electric and electronic products - Part 2: Test methods - Test Fi: Vibration - Mixed mode | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K04 | | Classification of International Standard | 19.040 | | Word Count Estimation | 30,339 | | Date of Issue | 2008-05-19 | | Date of Implementation | 2009-01-01 | | Adopted Standard | IEC 60068-2-80-2005 Ed.1.0, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards 2008 No. 8 (No. 121 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies test methods for simulating complex and need to withstand vibration test sample mixed excitation. The purpose of this section is required to verify subjected to mixed-mode excitation, the samples in the function and/or structure does not produce unacceptable decrease. When the actual ambient vibration measurement data with mixed mode, using this method is particularly suitable cut -vibration environments. This section also applies to reveal random and sine and/or cumulative effects of vibration stress random mixed, and the resulting sample mechanical defects and provisions decreased performance, this information can be combined with the relevant norms of acceptability of the samples assessed. | GB/T 2423.58-2008: Environmental testing for electric and electronic products - Part 2: Test methods - Test Fi: Vibration - Mixed mode
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Environmental testing for electric and electronic products - Part 2.Tests methods - Test Fi. Vibration - Mixed Mode
ICS 19.040
K04
National Standards of People's Republic of China
GB/T 2423.58-2008/IEC 60068-2-80..2005
Environmental testing of electrical and electronic products
Part 2.Test method
(IEC 60068-2-80.2005Ed.1.0, IDT)
2008-05-19 released
Implementation of.2009-01-01
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Issued by the National Standardization Administration of China
Environmental testing of electrical and electronic products
Part 2.Test method
1 Scope
The test methods provided in this section are suitable for samples that need to undergo complex simulation and mixed excitation vibration tests.
The purpose of this section is to verify that the sample will not produce unacceptable functions and/or structure after being subjected to the specified mixed mode excitation.
The reduction. When the vibration measurement data of the actual environment has mixed modes, this method is particularly suitable for tailoring the vibration environment.
This section is also applicable to reveal the cumulative effect of random and sine and/or random mixed vibration stress, and the resulting mechanical defects
And the reduction of specified performance, this information combined with relevant specifications can assess the acceptability of the sample. In some cases, this test method is also applicable
To verify the mechanical strength of the sample.
This section also applies to samples that may be subjected to random and/or random combined with certain characteristics of vibration during transportation or actual use.
Such as aircraft, spacecraft and transportation will be packed in the transport container, and the transport container will be part of the sample itself.
This section applies to electrical and electronic products, as well as other fields that require it.
2 Normative references
The clauses in the following documents have become clauses of this part after being quoted in this part of GB/T 2423.All dated quotations
All subsequent amendments (not including errata content) or revisions do not apply to this section. However, it is encouraged to achieve
The parties to the agreement study whether the latest versions of these documents can be used. For undated reference documents, the latest version is applicable to this
section.
GB/T 2421-1999 General rules for environmental testing of electrical and electronic products (idt IEC 60068-1.1988)
GB/T 2423.10-2008 Environmental testing of electrical and electronic products Part 2.Test method Test Fc. Vibration (sine) (IEC
60068-2-6..1995, IDT)
GB/T 2423.43-2008 Environmental testing of electrical and electronic products Part 2.Test methods Vibration, shock and similar dynamic tests
Installation of test samples (IEC 60068-2-47..1995, IDT)
GB/T 2423.56-2006 Environmental testing of electrical and electronic products Part 2.Test method Test Fh. Broadband random vibration
(Numerical Control) and Guidelines (IEC 60068-2-64..1993, IDT)
IEC 60050-300..2001 International Electrotechnical Vocabulary Electrical and Electronic Measuring and Measuring Instruments
IEC 60050-311 International Electrotechnical Vocabulary and General Terms Related to Measurement
IEC 60050-312 International Electrotechnical Vocabulary General terms related to electrical measurement
IEC 60050-313 International Electrotechnical Vocabulary Types of Electrical Measuring Instruments
IEC 60050-314 International Electrotechnical Vocabulary. Special terms used according to the type of instrument
IEC 60068-3-8..2003 Environmental Test Part 3-8.Vibration Test Selection
IEC 60068-5-2..1990 Environmental Testing Part 5.Drafting Guidelines for Test Methods, Terms and Definitions
ISO 2041..1990 Vocabulary of vibration and shock
3 Terms and definitions
The terms used in this section defined below are generally in ISO 2041-1990, IEC 60050-300..2001, GB/T 2421-1999,
It has been defined in GB/T 2423.10-2008, GB/T 2423.56-2006 and IEC 60068-5-2.1990.For the convenience of the reader, this
A certain definition from the above-mentioned standard is used here, and the source and differences are pointed out.
GB/T 2423.58-2008/IEC 60068-2-80..2005
In addition, the terms and definitions added below are also applicable.
3.1
Movement in the non-excited direction is usually defined as two orthogonal axes.
3.2
The movement represented by the broadband signal returned from the reference point sensor.
3.3
The part where the sample is in contact with the fixture or the table surface of the vibrating table is usually the point where the sample is fixed in use.
Note. If it is used as a fixture as a part of the actual installation structure, the fixed point should be the point on the installation structure, not the point from the sample.
3.4 Control points
3.4.1
By using the signal from the reference point, the vibration of the point is maintained at a prescribed level of control.
3.4.2
The signal from each detection point is realized by continuous arithmetic average or comparison technology processing according to the requirements of relevant specifications
For control method, see 3.9.
3.5
The standard acceleration value produced by the gravity of the earth, which varies with altitude and geographic latitude.
3.6
Some specific points of data collected in the experiment. There are 3 types, which are defined as follows.
3.6.1
The point located on the fixture, the vibrating table or the sample as close to the fixed point as possible. The test point must be rigid with the sample in any case
connection.
Note 1.The number of test points should meet the requirements of the test.
Note 2.If there are 4 or less fixed points, each is used as a detection point. If there are more than 4 fixed points, the relevant regulations shall specify
Four representative fixed points are used as detection points.
Note 3.In special cases, such as large or complex samples, if the test point is required to be elsewhere (not close to the fixed point), it should be included in the relevant specifications
Regulations.
Note 4.When a large number of small samples are installed in a fixture, or when a small sample has many fixed points, in order to derive the control signal, a single test can be selected
Point (ie reference point). The signal is related to the fixture and not to the fixed point of the sample. In this case, only after the fixture is loaded with samples and other loads
Only when the lowest resonance frequency is sufficiently higher than the upper limit of the test frequency is feasible.
3.6.2
In order to meet the requirements of this part of the selected point from the detection point, the signal at this point is used for the control test.
3.6.3
A point derived from multiple detection points manually or automatically, and the result is used to control the test to meet the requirements of this section.
GB/T 2423.58-2008/IEC 60068-2-80..2005
3.6.4
A specific point on the sample where data is collected for vibration response analysis.
Note. It is different from detection point and reference point.
3.7
The three axes perpendicular to each other are the most vulnerable in the sample.
3.8
The number of discrete values collected per second, used to digitally record or represent a time history.
3.9
The calculation method of reference control signal is adopted when multi-point control is adopted. The following frequency domain control strategies can be selected, see 3.4.2.
3.9.1
For the processing method of obtaining the control value from the arithmetic mean of the signal value of each frequency at more than one detection point, see 3.31.
3.9.2
For the processing method of the control value formed by the maximum or minimum value of the signal value on each frequency line at more than one detection point, see 3.31.
3.10
MAX/SUM
Define the random superimposed random severity level of the narrowband ASD value (see 3.14).
Note. MAX means the larger value of the background or narrowband ASD, and SUM means the sum of the two ASD values.
3.11
The ratio of the peak value to the root mean square (r.m.s.) value of the synthesized mixed waveform.
3.12
Define the strategy for calculating the reference acceleration spectral density of the sine component and the random ASD on each frequency line.
3.13
In the frequency response function, the maximum response corresponding to a resonance peak is 0.708 times the bandwidth between the two points.
3.14
ASD
When the bandwidth tends to zero and the average time tends to infinity, the part of the acceleration signal that passes through the center frequency narrowband filter on each unit bandwidth
The mean square value of the number.
3.15
For random signals, the actual limited frequency resolution causes a systematic error in calculating the acceleration spectral density. For sinusoidal signals, by
Calculate the systematic error of the amplitude of the sinusoidal component in the mixed mode signal at the averaging time.
GB/T 2423.58-2008/IEC 60068-2-80..2005
3.16
Acceleration spectral density measured at a reference point or virtual point.
3.17
It includes the following steps.
--- Digitize the analog signal of the reference point mixed mode waveform;
--- Carry out necessary data processing;
---Generate the updated analog hybrid mode drive waveform and output it to the power amplifier of the vibration system (see Chapter B.1).
3.18
The maximum limit of the driving signal is expressed by crest factor.
3.19
3.20
The difference between the specified acceleration spectral density value and the control acceleration spectral density value.
3.21
Minimization of acceleration spectral density error.
3.22
3.23
The width of the frequency interval in the acceleration spectral density in hertz.
Note. In order to calculate the specified acceleration spectral density in digital analysis, the sampling record is divided into several parts, and the reciprocal of the sampling length of each part is the resolution
rate. In the frequency range, the number of frequency lines is equal to the number of frequency intervals.
3.24
The true acceleration spectral density read from the analyzer is affected by instrument error, random error and system deviation.
3.25
3.26
The error associated with each simulation link input by the control system and each simulation link of the control system.
3.27
The actual averaging time is limited and the filter bandwidth is limited.
3.28
A collection of equally spaced data points in the time domain used for fast Fourier transform calculations.
GB/T 2423.58-2008/IEC 60068-2-80..2005
3.29
The degree of consistency between the measurement results of the same number of measurements with the same value is measured individually as follows.
Different test methods;
---Different measuring instruments;
---Different observers;
---Different laboratories;
---After a longer time interval relative to the duration of a single measurement;
---Different instrument usage habits.
Note. The term "reproducibility" can also be applied when some of the above conditions are met.
[IEC 60050 (300)..2001]
3.30
square root.
Note. In this test method, the root mean square of the acceleration, velocity and displacement of the mixed mode of random or sine plus random (Sor) and random plus random (RoR)
You can press B. 2.4 Calculation.
3.31
The random component of the mixed mode signal is represented by the acceleration spectral density value, and the sine component is represented by the amplitude value.
3.32
In vibration theory, the mean value of vibration is equal to zero. Therefore, the standard deviation of a random time history is equal to the root mean square value.
3.33
The ratio of the true acceleration spectral density to the indicated value of the acceleration spectral density.
Note. Only for the random part of the mixed mode signal.
3.34
When using the time averaging technique to estimate the acceleration spectral density of random data, the effective number of statistical degrees of freedom depends on the frequency resolution and
Effective average time.
3.35
Sweep once in the specified frequency range, for example, from 5 Hz to 500 Hz to 5 Hz.
Note. Corresponding to "sweep cycle", one-way sweep means only sweep in one direction up or down.
[GB/T 2423.10-2008]
3.36
The rate of change of sine frequency can be expressed in octave/minute or hertz/second.
3.37
The acceleration spectral density of the random waveform acting on the sample.
GB/T 2423.58-2008/IEC 60068-2-80..2005
4 Test requirements
4.1 General
These features are suitable for a complete vibration test system. For electric and hydraulic servo test systems, the system includes power amplifiers, vibration
Bench, test loading fixture and control system.
The following basic movement and lateral movement should be checked before the start of the test or during the test using the additional input monitoring channel of the controller.
The relevant specifications should give the inspection test magnitude and the procedures used.
The standard test method consists of the following test sequence, and can be used on each axis perpendicular to each other of the sample.
a) Use low-level sine or random excitation to check the initial vibration response, see 5.4 and 9.2.
b) Mixed mode excitation is used as a load or stress test.
c) Final response check (see 9.5), compare with the initial situation and find out possible mechanical failures caused by dynamic performance changes.
However, if the dynamic performance of the sample is known or not required, the relevant specifications can waive the requirement for response inspection.
4.2 Control system
The control system needs a special control software package, which should have the control and analysis of random plus random or sine plus random mixed test
ability.
4.3 Basic movement
Each fixed point of the sample should be stipulated by relevant specifications, their movement should be roughly the same, and its basic movement should be linear. If shipped
It is difficult to achieve roughly the same movement, and multi-point control should be used.
The characteristics of the basic motion, the random wave should conform to the Gaussian distribution; the periodic component is sine.
4.4 Lateral movement
The sine or random lateral movement inspection shall be carried out according to the magnitude specified in the relevant specification before the test, or additional monitoring shall be used during the test.
Check the lateral movement of the measuring channel.
The signal value of each frequency point along any axis perpendicular to the specified axis at the check point shall not exceed the specified signal above 500 Hz
Value; below 500Hz, it should not exceed -3dB of the specified value. The total root mean square of acceleration along any axis perpendicular to the specified axis shall not exceed the specified
50% of the root mean square value of the fixed axis. For example, for small samples, if relevant regulations stipulate, the allowable signal value of lateral movement should be limited to
Ensure that it does not exceed -3dB of the basic movement.
It is difficult to obtain these values for samples of large size or high centroid at certain frequencies. In addition, the severity level stipulated by the relevant regulations
It may also be difficult to reach these values when there is a large dynamic range. In these cases, the relevant regulations should specify which of the following methods should be adopted.
a) The lateral movement exceeding the above given value shall be monitored and recorded in the report;
b) Lateral movement does not need to be monitored.
4.5 Installation
The samples should be installed in accordance with the requirements of GB/T 2423.43-2008.In all cases, the music selected in GB/T 2423.43-2008
The line must be squared and then multiplied by the acceleration spectral density (ASD) or directly multiplied by the sine amplitude.
4.6 Measuring system
The characteristics of the measurement system should be such that the actual value of the vibration measured from the reference point in the given axial direction is within the tolerance range required by the test.
The entire measurement system includes sensors, signal conditioners, data collectors and data processors, and its frequency response has a significant effect on measurement accuracy
The frequency response of the measurement system in this frequency range should be flat and within ±5%.
GB/T 2423.58-2008/IEC 60068-2-80..2005
8 Initial measurement
The relevant specifications shall require the appearance, size and function inspection of the samples as well as other inspections required by the specifications.
9 Test
9.1 General
The test is carried out in the order specified by the relevant specifications. The different steps are as follows.
--- If specified, perform an initial vibration response check;
--- Low-level incentives for equilibrium before the test;
---Mixed mode vibration test;
---If specified, perform a final vibration response check.
Unless otherwise specified in relevant specifications, samples should be excited on each preferred axis in sequence. Unless otherwise specified in the relevant specifications, the order of the tested shafts shall not be
unimportant. If the sample can only withstand the test under normal working conditions, it should be specified in the relevant procedures.
The control value of each frequency at the reference point should come from a single detection point when single-point control is used; when multi-point control is used, it should come from multiple
Detection points.
In the latter case, the relevant regulations shall specify which of the following.
---The average value of each detection point signal (average control);
---The weighted average of the signal at the detection point (weighted average control);
---It is also the maximum or minimum extreme value on each frequency of all detection points (extreme value control).
It should be controlled at a prescribed magnitude.
In these cases of multipoint control, the control spectrum becomes a virtual spectrum separated from the existing detection points.
If the sample with a shock absorber is usually used, some special treatment methods should be adopted when the shock absorber must be removed during the test. see
GB/T 2423.43-2008.
9.2 Check of initial vibration response
If specified in the relevant specifications, at least one point on the sample should be checked for dynamic response within the specified frequency range. Relevant norms
The number and location of response points should be clearly defined.
The vibration response inspection with sinusoidal or random vibration should be carried out in accordance with the frequency range and test magnitude specified in the relevant specifications. Sinusoidal vibration
Refer to GB/T 2423.10-2008, and refer to GB/T 2423.56-2006 for random vibration. More information on the advantages and disadvantages of each method
Please refer to IEC 60068-3-8.2003.
The test magnitude selected for the response check should ensure that the response of the sample at this time is less than that of the mixed mode test, but it is high enough to identify the risk.
Risk frequency.
Use a sinusoidal excitation with a logarithmic sweep rate not exceeding 1 oct/min to check the response. In order to obtain more accurate response characteristics, it is sometimes possible to
It may be necessary to reduce the sweep rate. However, inappropriate staying should be avoided.
The random vibration response inspection should consider using a long enough time to minimize the random variation of the vibration response. It must be pointed out that the frequency resolution
The rate should be high enough to accurately determine the response peak (the narrowest -3dB bandwidth), and it is recommended to include at least 5 spectral lines in the narrowest -3dB bandwidth.
If the relevant regulations stipulate that the sample needs to work in the vibration response inspection. If the mechanical vibration characteristics cannot be evaluated when the sample is working, it is necessary to attach
Add non-working samples to check the vibration response. At this stage, the product should be inspected to determine the frequency of danger and should be recorded in the report.
9.3 Low-level incentive equalization before the test
Before the mixed vibration test of the specified magnitude, it is necessary to use the signal to carry out a smaller magnitude random excitation with the actual sample for the signal
Equilibrium and initial analysis. The acceleration spectral density value applied at this stage should be kept to a minimum.
The allowable duration of the initial random excitation is as follows.
Below the specified acceleration r. m. s. Magnitude-12dB. No time limit.
The specified acceleration r. m. s. Magnitude of -12dB to -6dB. not more than 1.5 times the specified test time.
GB/T 2423.58-2008/IEC 60068-2-80..2005
The specified acceleration r. m. s. Magnitude of -6db to 0db. not more than 10% of the specified test time.
The duration of the initial random excitation shall not be deducted from the specified mixed vibration test.
9.4 Mixed mode vibration test
9.4.1 General
In some cases, environmental vibration is characterized by reciprocating or rotating structures and mechanisms, such as rotating blades, gears, propellers, pistons, firearms, etc.
Determined by quasi-periodic vibration. When these excitation forms are dominant, the source resident vibration is appropriate. Source resident vibration is affected by broadband vibration, high-level
The narrowband random or superimposed sinusoidal vibration effects.
9.4.2 Random plus random trial
Scanning narrowband random on broadband random vibration is defined as one or more narrowband random and random operations in the frequency range covered by the scan.
Broadband random vibration with superimposed background.
The composite vibration severity level of the narrowband vibration scan superimposed on the wideband random is determined by the parameters of 6.1 and 6.2.
In some cases, narrow-band random may not have to scan within a certain defined bandwidth. In this case, such vibrations are essentially the same as those in a certain defined bandwidth.
The broadband random vibration specified in GB/T 2423.56-2006 is the same. The relevant specifications shall specify the method to be used.
9.4.3 Sine plus random test
Swept frequency sine vibration on broadband random vibration is defined as superimposing one or more sine waves covering a certain frequency range on random vibration
Sweep frequency.
The synthetic vibration severity level parameters including the sine frequency sweep part superimposed on the random background are determined by the parameters in 6.1 and 6.3.
In some cases, it is not necessary to scan within a certain defined bandwidth. In this case, the parameters b), c), d), f) and g) of 6.3
No regulations are required. The relevant regulations should specify the method to be used.
9.4.4 Sine plus random plus random test
In fact, this is some combination of 9.4.2 and 9.4.3.The relevant specifications should specify the required combination.
9.5 Final vibration response check
If the relevant code stipulates that the initial response check is required, the vibration response check may also be required after the mixed-mode vibration test to determine
Whether it has changed or failed after the initial response check. The final response check shall use the initial response in the same way as the initial response
Check the same parameters and check the same response points. If the results of the two response inspections are different, the relevant regulations shall specify the corresponding treatment
method.
10 Intermediate inspection
If specified in the relevant specifications, the sample should be in working condition and undergo a functional inspection during the mixing test.
11 Recovery
If there are provisions in the relevant specifications, sometimes a period of time should be allowed for the sample after the end of the test and before the final measurement to restore the sample to the
The same conditions as the initial measurement, such as temperature conditions.
12 Final measurement
The relevant specifications shall provide for the appearance, size and function inspection and other inspections of the samples.
The relevant specifications shall specify the criteria for accepting or rejecting samples.
13.Information to be provided by relevant specifications
When the relevant specification i...
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