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SN/T 5274-2020: (Fireworks bomb launch dynamic pressure test sensor method)
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| SN/T 5274-2020 | English | 179 |
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(Fireworks bomb launch dynamic pressure test sensor method)
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SN/T 5274-2020
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Basic data | Standard ID | SN/T 5274-2020 (SN/T5274-2020) | | Description (Translated English) | (Fireworks bomb launch dynamic pressure test sensor method) | | Sector / Industry | Commodity Inspection Standard (Recommended) | | Classification of Chinese Standard | G89 | | Classification of International Standard | 71.100.30 | | Word Count Estimation | 8,873 | | Date of Issue | 2020-08-27 | | Date of Implementation | 2021-03-01 | | Regulation (derived from) | General Administration of Customs Announcement No. 98 [2020] | | Issuing agency(ies) | General Administration of Customs | SN/T 5274-2020: (Fireworks bomb launch dynamic pressure test sensor method)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Dynamic pressure measurement of shells projectile launching-Sensor method
The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards
2020-08-27 release
2021-03-01 implementation
Issued by the General Administration of Customs of the People's Republic of China
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed and managed by the General Administration of Customs of the People's Republic of China.
Drafting organization of this standard. Changsha Customs of the People's Republic of China.
The main drafters of this standard. Jiang Zicheng, Tan Aixi, Zhang Guanghui, Ding Zhongxi, Jiang Fangming.
Dynamic pressure test sensor method for fireworks launch
Warning. The personnel using this standard should have practical experience in formal laboratory work. This standard does not point out all possible safety issues
It is the responsibility of the user to adopt appropriate safety and health measures and to ensure compliance with the conditions stipulated by relevant national laws.
The sample involved in this standard is a kind of flammable and explosive dangerous goods. The following are the most important safety technical regulations.
a) The moving and disposal of the sample should be carried out under the condition of safety protection measures;
b) The transfer and storage volume of the sample should not exceed the conditions allowed by the safety protection;
c) Fully understand the dangers of explosions, projections and combustion products generated by the samples during the test, and ensure that personnel are in place when the samples are ignited.
In a safe area or in a bunker sufficient to ensure the safety of personnel.
1 Scope
This standard specifies the equipment, materials, test procedures and data processing required for the sensor method to test the dynamic pressure in the cylinder when the firework bomb is launched.
This standard is applicable to the test of the peak pressure in the barrel and the launch impulse when the firework shells of 50 mm～25 mm are launched.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB 19594 Fireworks and Firecrackers
JJG 59 Piston Pressure Gauge
3 Terms and definitions
The following terms and definitions defined in GB 19594 apply to this document.
3.1
Launch pressure
When the fireworks is set off, the maximum value of the pressure change in the launching cylinder is expressed in megapascals (MPa).
3.2
Ascent along time
The time interval during which the pressure in the launching barrel increases from 1% of the launch pressure value to the maximum value when the fireworks is set off.
3.3
Descent along time
When the fireworks is set off, the time interval between the change in pressure in the launch barrel from the maximum value to 1% of the launch pressure value.
3.4
Launch impulse
The gas produced when the firework propellant burns acts on the impulse of the launching tube.
4 Equipment and materials
4.1 Test device
4.1.1 The test device consists of a launch tube, ignition device, sensor, data collector, control and data processing software system (system group
For the schematic diagram, see Figure A.1 in Appendix A).
4.1.2 The launch tube used for the test is a set of steel tube with closed ends made of medium carbon steel. The specifications should meet the requirements of Table 1.Each steel cylinder is in
The bottom center is drilled to fix the pressure sensor.
4.1.3 The detonator can provide DC power with voltage ≥ 6 V and power ≥ 50 W, with remote control trigger function, control distance
≥120 m.
4.1.4 Ignition device, composed of electric ignition head for fireworks and attached wires, total resistance ≤3 Ω, electric ignition head bridge wire resistance 0.9 Ω~1.2 Ω,
The dose is 40 mg.
4.1.5 Piezoelectric pressure sensor, range 0 MPa~30 MPa, nonlinearity ≤±0.2%, response frequency ≥200 kHz, temperature tolerance
≥150 ℃, interface thread M20×1.5.
4.1.6 Dynamic pressure acquisition system, sampling frequency ≥100 kHz, sampling duration ≥5 s, trigger mode is internal trigger or manual trigger (can be
Option), can zoom in on the curve, find the extreme value or the difference between two points, time integration and other operations.
4.2 Piston pressure gauge
Should meet the requirements of JJG 59.
4.3 Calipers
Accurate to 0.1 mm.
5 Test preparation
Use piston pressure gauge (4.2) and pressure acquisition system to statically calibrate the test pressure sensor.
6 Test procedure
6.1 Measure the projectile diameter of the sample with a caliper (4.3), and select a suitable test launch tube according to the measured value according to the requirements of Table 2.Bullet diameter does not meet table 2
Samples with deviations specified in the above cannot be used for subsequent testing. Measure and record the inner diameter of the launch tube.
6.2 Erect the launch tube with the pressure sensor upright and keep it firmly. Put the sample to be tested into the launch tube.
6.3 Set the sampling frequency, sampling duration, trigger mode and trigger level of the pressure acquisition system according to the specifications of the test sample.
6.4 The sample is ignited, and the pressure acquisition system records the pressure change curve measured by the pressure sensor over time.
Use the data acquisition system to record the peak pressure (Pp) of the pressure curve and the rising and falling time of the pressure during launch.
6.5 Repeat the operations described in 6.1~6.4.For each size of firework bombs, at least 5 tests are carried out.
7 Data processing
7.1 Calculation of launch pressure
Take the maximum peak pressure value (Pp) in 5 times as the test result.
7.2 Calculation of launch impulse
Ii-the launch impulse of a single measurement, the unit is Newton second (N·s);
D-the inner diameter of the sample launching tube, in meters (m);
Pi-the instantaneous emission pressure during a single measurement, in Pa (Pa);
tai--the rising edge time in a single measurement, in seconds (s);
tdi--the falling edge time of a single measurement, in seconds (s);
t --time, in seconds (s);
I-the average value of the launch impulse, the unit is Newton second (N·s);
N --The number of measurements.
7.3 If applicable, the maximum peak pressure and emission impulse can be directly calculated through the data processing software.
Appendix A
(Informative appendix)
Drawings of test equipment and materials
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