ISO 16781:2021 Space systems — Simulation requirements for control system

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INTERNATIONAL STANDARD ISO 16781:2021

Space systems — Simulation requirements for control system

1 Scope

This document establishes the requirements for simulation of the space control system, including the objective, architecture and procedure, etc. This document is applicable to four phases of control system development, including conceptual design, detailed design, prototype and integrated system.

The control system referred to in this document is the flight control system for guidance, navigation and control (GNC) of space systems which include launch vehicle, satellite and spaceship, etc. This document establishes a minimum set of requirements for simulation of the flight control system, and provides guidance to engineers on what to simulate in each phase of control system development. The requirements are generic in nature because of their broad applicability to all types of simulations. Implementation details of the requirements are addressed in project-specific standards, requirements, and handbooks, etc.

2 Normative references

There are no normative references in this document.

3 Terms, d efinitions and abbreviated terms

3.1 Terms and definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

3.1.1

accuracy

measure of how close a value is to the “true” value

[SOURCE: ISO 14952-1:2003, 2.1]

3.1.2

control system

system designed to give the controlled plant the specified control objectives, and including relevant functions of controller, sensor and actuator

Note 1 to entry: In this document, the word “controller” is used to designate the flight control computer which manages the flight dynamic behaviour of space system.

3.1.3

emulator

prototype of the flight equipment, which has the identical input/output interfaces as the flight equipment and has similar operating behaviour

ISO 16781:2021

3.1.4

f idel it y

degree to which a model or simulation (3.1.9) reproduces the state and behaviour of a real-world object or the perception of a real-world object, feature, condition, or chosen standard in a measurable or perceivable manner

3.1.5

hardware‑ in‑ the‑ loop simulation

HITL simulation

kind of simulation (3.1.9), in which some simulation models (3.1.11) of the control system (3.1.2) are implemented by real equipment

3.1.6

mathematical simulation

kind of simulation (3.1.9), in which all the simulation models (3.1.11) of the control system (3.1.2) are implemented by software

3.1.7

real‑ time simulation

kind of simulation (3.1.9), in which the time scale of dynamic process in the simulation model (3.1.11) strictly equals to that of the real system

3.1.8

reliability

ability of an item to perform a required function under given conditions for a given time interval

Note 1 to entry: It is generally assumed that the item is in a state to perform this required function at the beginning of the time interval.

Note 2 to entry: Generally, reliability performance is quantified using appropriate measures. In some applications these measures include an expression of reliability performance as a probability, which is also called reliability.

[SOURCE: ISO 10795:2019, 3.198]

3.1.9

simulation

use of a similar or equivalent system to imitate a real system, so that it behaves like or appears to be the real system

3.1.10

control system simulation

complex progress of building simulation (3.1.9) system based on the mathematical model of the control system (3.1.2), testing the model, solving the system dynamic equations, imitating dynamic behaviours of the control system, and taking qualitative and quantitative analysis and research about the scheme, structure, parameters, and performance of the control system

3.1.11

simulation model

equivalent model in the simulation (3.1.9) system, which is transformed from the mathematical model of the control system (3.1.2) by means of simulation software or hardware

3.1.12

simulation plan

document in which the content, operate steps and implement method of all simulation (3.1.9) items are specified

3.1.13

stability

ability of a system submitted to bound external disturbances to remain indefinitely in a bounded domain around an equilibrium position or around an equilibrium trajectory

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