EN 16602-30-09:2014
(Main)Space product assurance - Availability analysis
Space product assurance - Availability analysis
This Standard is part of a series of ECSS Standards belonging to ECSS Q ST-30, Space product assurance – Dependability. The present standard defines the requirements on availability activities and provides where necessary guidelines to support, plan and implement the activities.
It defines the requirement typology that is followed, with regard to the availability of space systems or subsystems in order to meet the mission performance and needs according to the dependability and safety principles and objectives.
This Standard also describes the process that is followed and the most significant methodologies for the availability analysis to cover such aspects as
• evaluation of the space element or system availability figure,
• allocation of the requirement at lower level, and
• outputs to be provided.
This Standard applies to all elements of a space project (flight and ground segments), where Availability analyses are part of the dependability programme, providing inputs for the system concept definition and design development.
The onground activities and the operational phases are considered, for availability purposes, in order to
• acquire additional information essential for a better system model finalization and evaluation, and
• monitor the system behaviour to optimize its operational performance and improve the availability model for future applications.
This standard may be tailored for the specific characteristic and constraints of a space project in conformance with ECSS-S-ST-00.
Raumfahrtproduktsicherung - Verfügbarkeitsanalyse
Assurance produit des projets spatiaux - Analyse de disponibilité
Zagotavljanje varnih proizvodov v vesoljski tehniki - Analiza razpoložljivosti
Standard EN 16602-30-09 je del serije standardov ECSS, ki pripadajo standardu ECSS-Q-ST-30, Zagotavljanje varnih proizvodov v vesoljski tehniki - Zanesljivost. Ta standard določa zahteve glede dejavnosti razpoložljivosti in zagotavlja, kjer je to potrebno, smernice za podporo, načrtovanje ter izvajanje dejavnosti. Določa uporabljeno tipologijo zahtev glede na razpoložljivost vesoljskih sistemov in podsistemov, za izpolnitev ciljev in potreb misije v skladu z načeli in cilji glede zanesljivosti in varnosti. Ta standard opisuje tudi postopek, ki se izvaja, in najpomembnejše metodologije za analizo razpoložljivosti, ki zajema vidike, kot so – ocena vesoljskega elementa ali ocena razpoložljivosti sistema, – razporeditev zahteve na nižji ravni, in – izhodi, ki jih je treba zagotoviti. Ta standard velja za vse elemente vesoljskega projekta (med letenjem in na tleh), kjer so analize razpoložljivosti del programa za zanesljivost, ter zagotavlja vhodne podatke za definicijo zasnove sistema in razvoj projektiranja. Dejavnosti na tleh in operativne faze se obravnavajo za namene dostopnosti, da bi – pridobili dodatne informacije, nujne za boljšo finalizacijo in oceno sistemskega modela ter – spremljanje vedenja sistema za optimizacijo njegovega operativnega delovanja in izboljšanje modela dostopnosti za uporabe v prihodnosti. Ta standard se lahko prilagodi posameznim lastnostim in omejitvam vesoljskega projekta v skladu s standardom ECSS-S-ST-00.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2014
Zagotavljanje varnih proizvodov v vesoljski tehniki - Analiza razpoložljivosti
Space product assurance - Availability analysis
Raumfahrtproduktsicherung - Verfügbarkeitsanalyse
Assurance produit des projets spatiaux - analyse de disponibilité
Ta slovenski standard je istoveten z: EN 16602-30-09:2014
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 16602-30-09
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS 49.140
English version
Space product assurance - Availability analysis
Assurance produit des projets spatiaux - Analyse de Raumfahrtproduktsicherung - Verfügbarkeitsanalyse
disponibilité
This European Standard was approved by CEN on 6 March 2014.
CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving
this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning
such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN and CENELEC
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC Management Centre
has the same status as the official versions.
CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
CEN-CENELEC Management Centre:
Avenue Marnix 17, B-1000 Brussels
© 2014 CEN/CENELEC All rights of exploitation in any form and by any means reserved Ref. No. EN 16602-30-09:2014 E
worldwide for CEN national Members and for CENELEC
Members.
Table of contents
Foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
3.1 Terms from other standards . 7
3.2 Terms specific to the present standard . 7
3.3 Abbreviated terms. 10
4 Objectives of availability analysis . 11
5 Specifying availability and the use of metrics . 12
5.1 General . 12
5.1.1 Introduction . 12
5.1.2 Availability requirements . 12
5.2 Different ways of specifying availability . 13
5.2.1 Probability figure convention . 13
5.2.2 Availability during mission lifetime for a specified service . 13
5.2.3 Availability at a specific time (or time interval) for a specified service . 14
5.2.4 Percentage or number of successfully delivered products . 15
5.2.5 Outage probability distribution . 15
5.3 Metrics commonly used . 16
5.4 Metrics mapping . 16
5.4.1 General . 16
5.4.2 Metrics mapping at system or subsystem level . 16
5.4.3 Metrics mapping at equipment level . 17
6 Availability assessment process . 18
6.1 Overview of the assessment process. 18
6.2 Availability allocation . 19
6.3 Iterative availability assessment . 20
6.4 Availability report content . 22
7 Implementation of availability analysis . 23
7.1 Overview . 23
)
7.2 Availability activities and programme phases . 23
7.2.1 Feasibility phase (Phase A) . 23
7.2.2 Preliminary definition phase (Phase B) . 24
7.2.3 Detailed definition and production phases (Phase C/D) . 24
7.2.4 Utilization phase (Phase E) . 25
Annex A (informative) Suitable methods for availability assessment . 26
A.1 Overview . 26
A.2 Analytical method . 26
A.3 Markov process . 27
A.4 Monte-Carlo simulation . 28
Annex B (informative) Typical work package description for availability
activities . 29
Bibliography . 30
Figures
Figure 3-1: Relations between the various values that characterize the reliability,
maintainability and availability of equipment . 8
Figure 6-1: Availability assessment process . 19
Figure 6-2: Example of a dynamic behaviour model . 21
Figure A-1 : Basic availability formulae . 27
Figure A-2 : Example of Markov graph . 28
Figure A-3 : Example of Petri net modelling . 28
Tables
Table 5-1 Availability and supporting metrics applicable at system and subsystem level . 17
Foreword
This document (EN 16602-30-09:2014) has been prepared by Technical
Committee CEN/CLC/TC 5 “Space”, the secretariat of which is held by DIN.
This standard (EN 16602-30-09:2014) originates from ECSS-Q-ST-30-09C.
This European Standard shall be given the status of a national standard, either
by publication of an identical text or by endorsement, at the latest by March
2015, and conflicting national standards shall be withdrawn at the latest by
March 2015.
Attention is drawn to the possibility that some of the elements of this document
may be the subject of patent rights. CEN [and/or CENELEC] shall not be held
responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the
European Commission and the European Free Trade Association.
This document has been developed to cover specifically space systems and has
therefore precedence over any EN covering the same scope but with a wider
domain of applicability (e.g. : aerospace).
According to the CEN-CENELEC Internal Regulations, the national standards
organizations of the following countries are bound to implement this European
Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Scope
This Standard is part of a series of ECSS Standards belonging to ECSS-Q-ST-30,
Space product assurance – Dependability. The present standard defines the
requirements on availability activities and provides where necessary guidelines
to support, plan and implement the activities.
It defines the requirement typology that is followed, with regard to the
availability of space systems or subsystems in order to meet the mission
performance and needs according to the dependability and safety principles
and objectives.
This Standard also describes the process that is followed and the most
significant methodologies for the availability analysis to cover such aspects as
• evaluation of the space element or system availability figure,
• allocation of the requirement at lower level, and
• outputs to be provided.
This Standard applies to all elements of a space project (flight and ground
segments), where Availability analyses are part of the dependability
programme, providing inputs for the system concept definition and design
development.
The on-ground activities and the operational phases are considered, for
availability purposes, in order to
• acquire additional information essential for a better system model
finalization and evaluation, and
• monitor the system behaviour to optimize its operational performance
and improve the availability model for future applications.
This standard may be tailored for the specific characteristic and constraints of a
space project in conformance with ECSS-S-ST-00.
Normative references
The following normative documents contain provisions which, through
reference in this text, constitute provisions of this ECSS Standard. For dated
references, subsequent amendments to, or revisions of any of these publications
do not apply. However, parties to agreements based on this ECSS Standard are
encouraged to investigate the possibility of applying the most recent editions of
the normative documents indicated below. For undated references the latest
edition of the publication referred to applies.
EN reference Reference in text Title
EN 16601-00-01 ECSS-S-ST-00-01 ECSS system — Glossary of terms
Terms, definitions and abbreviated terms
3.1 Terms from other standards
For the purpose of this Standard, the terms and definitions from
ECSS-S-ST-00-01- apply.
3.2 Terms specific to the present standard
3.2.1 achieved availability
probability that a system, subsystem or equipment, when used under stated
conditions in an ideal support environment operates satisfactorily at a given time
NOTE The downtime is associated only to the active
preventive and corrective maintenance.
3.2.2 active redundancy
every entity is operating and the system can continue to operate without
downtime or defects despite the loss of one or more entities
3.2.3 corrective maintenance
maintenance performed to restore system hardware integrity following
anomalies or equipment problems encountered during system operations
3.2.4 flight segment
product or a set of products intended to be operated in space
3.2.5 ground segment
all ground infrastructure elements that are used to support the preparation
activities leading up to mission operations, the conduct of mission operations
and all post-operational activities
3.2.6 hot redundancy
redundancy entity is “ON”, but not necessarily in the right configuration to
accomplish the function
3.2.7 instantaneous availability
probability that an item is in a state to perform a
required function under given conditions at a given instant in time, assuming
that the required external resources are provided
NOTE Preventive maintenance is generally not taken into
account for intrinsic availability.
3.2.8 instantaneous availability
probability that an item is in a state to perform a required
function under given conditions at a given instant of time, taking into account
the maintenance strategy (spares policy and related in logistic delays and
constraints)
3.2.9 lead time (supplier delay)
mean time for supplier to provide spares (including shipping time)
3.2.10 logistic delay
mean time for human and material maintenance means to be available (call-out
time)
3.2.11 mean
...
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