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Standards Development
This standard specifies the requirements of contents, methods, timing and result recording for polarity check of launch vehicles.
This standard can be used to guide the polarity-related check and test for launch vehicles throughout the whole phases before launch, including the inspection of parameters polarity during the design phase, and the check of installation polarity, plug-in polarity, etc., during the assembly and testing phase in the integration and launch site.
The main framework of this standard is as follows:
1) General requirements: the general requirements for the items of polarity check, timing and methods.
2) Contents of polarity check: detailed requirements, what should be checked for each kind of polarity.
3) Timing and methods selection: when and how to conduct the polarity check.
4) Results recording: what should be recorded for the polarity check, and related format.
There are a lot of situations can be interpreted as polarity issues for launch vehicles, especially for the products with same or similar physical characteristics, such as the specific installation direction of equipment, connection relationship of devices or cables, medium flow direction in pipelines, movement or rotation direction of mechanics, etc.
Polarity check has a decisive impact on the success of launch missions. If the polarity errors are still not be checked and corrected before ignition, the launch accidents will probably happen., Despite rapid technology progress in various fields of space vehicles, through investigation, accidents due to inconsistency in polarity still occurred in the past decade. So, a unified standard for polarity check is necessary to ensure the success of the flight mission and decrease the resulting flight accidents.
This standard can work out the following issues:
1) This standard could provide a standardized language, concept and definition for polarity check in the international collaboration. There are different terms and definitions for polarity among different countries and organizations, and even in the same country, which could result in confusion and misunderstanding for international communication and collaboration.
2) This standard establishes a standardized process and operational guidance for polarity checks. While existing relevant standards, such as ECSS-E-ST-60-30C, acknowledge the necessity and scope of polarity verification, this standard provides detailed implementation procedures.
Therefore, standardizing the process of polarity check is necessary to improve design implementation and test efficiency, and ensure that the requirements for polarity check are communicated among designers and testers from different countries without misunderstanding.
The objective of this proposal is to develop requirements for the polarity check during the design, assembly and testing phases, both in the integration and launch site, for the structural, electrical, power and optical products of launch vehicles.
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