GB/T 34523-2017 in English
VALIDEstimating methods for the mass of remaining propellant of spacecraft
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 34523-2017航天器剩余推进剂质量的估算方法》由TC425（全国宇航技术及其应用标准化技术委员会）归口，TC425SC5（全国宇航技术及其应用标准化技术委员会空间碎片分会）执行，主管部门为国家标准化管理委员会。
Introduction
1. Background of Standard Formulation and Technical Evolution
The formulation of GB/T 34523-2017 is based on the needs of spacecraft on-orbit management, especially the accurate estimation of the remaining propellant mass is of great significance for spacecraft life prediction and mission planning. The standard was proposed by China Aerospace Science and Technology Corporation and is managed by the National Technical Committee for Aerospace Technology and Its Application Standardization.
2. Comparison of Standard Frameworks
| Standard Requirements | Specific Provisions | Technical Points |
|---|---|---|
| Scope | Applicable to the estimation of the remaining mass of liquid propellant in the surface tension tank of spacecraft. | Compatible with the estimation needs of other types of tanks or propellants. |
| Symbols and Definitions | 25 core symbols and their units are listed in detail to ensure uniform terminology. | Parameters in multiple dimensions such as propellant flow rate, tank pressure, and temperature are involved. |
| Estimation Methods | Six main estimation methods are specified: BK method, PVT method, accelerometer method, ultrasonic flowmeter method, gas injection pressure excitation method, and heat capacity method. | Each method is accompanied by a detailed calculation formula and applicable scenario description. |
| Estimation Accuracy Assessment | The accuracy range of each method and its influencing factors are clarified. | Suggestions for improving estimation accuracy by combining multiple methods are proposed. |
3. Analysis of core estimation methods
a. BK method (Book-keeping method)
The BK method estimates the propellant consumption based on the flow rate at engine ignition, and is applicable to monopropellant and bipropellant systems. By formula:
Me = Mi - ∑（ωen,j Δtj）
Where, ωen is given by the engine ground test results.
b. PVT method (Pressure-Volume-Temperature method)
The PVT method is based on the principle of gas mass conservation and is applicable to constant pressure and falling pressure working modes. By formula:
Me = Mi - (Mfi - Mfe)K
Wherein, K is the mixing ratio, calculated by formula (4).
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