QJ 1818-1989 Strain measurement methods for solid rocket motors
1 Subject content and application scope
This standard specifies the composition, technical requirements, debugging, calibration, operation and data processing methods of the strain measurement system for solid rocket motors in standing test.
This standard is applicable to the measurement of strain values for solid rocket motors (the applicable measurement range of metal shell engine is 50-6,000 μm/m, and the applicable measurement range of filament wound shell engine is 300-30,000 μm/m, and the applicable temperature range is -40°C to +100°C).
2 Normative references
ZBY 117 Resistance strain gage
QJ 1046 Specification for measuring pressure of solid rocket motors
QJ 1275 Evaluation of uncertainty in measurement of solid rocket motor
3 Composition and uncertainty requirements of measurement system
3.1 The composition of the digital measurement system is shown in Figure 1.
Figure 1 Digital measurement system
3.2 The composition of the analog measurement system is shown in Figure 2.
Figure 2 Analog measurement system
3.3 Both digital measurement system and analog measurement system can be used. While the digital measurement system is recommended.
3.4 The uncertainty of the system shall meet the following requirements:
a. The uncertainty of the test data provided by the digital measurement system is less than or equal to 5%;
b. The uncertainty of the test data provided by the analog measurement system is less than or equal to 7%.
4 Measuring equipment and its requirements
1 Subject content and application scope
2 Normative references
3 Composition and uncertainty requirements of measurement system
4 Measuring equipment and its requirements
5 Operation method
6 Data acquisition and processing
7 System verification (excluding strain gauge)
