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BS EN 9721:2021:2022 Edition

BS EN 9721:2021:2022 Edition

$215.11

Aerospace series. General recommendation for the BIT Architecture in an integrated system

Published By Publication Date Number of Pages
BSI 2022 94
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PDF Pages PDF Title
2 undefined
9 1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
15 3.2 Abbreviations
17 4 BITxe “BIT” stakeholders
4.1 BITxe “BIT” specifier
4.2 BITxe “BIT” designer/developer
4.3 Operational user
4.4 Maintenance engineer
18 4.5 System technical manager
4.6 Expert
4.7 Field data engineer
5 System constraints
5.1 System design
19 5.2 BITxe “BIT” interface functionxe “function”
5.2.1 The alarmxe “alarm” functionxe “function”
20 5.2.2 The diagnosticxe “diagnostic” functionxe “function”
5.2.3 Built-in reconfiguration
5.2.4 The maintenancexe “maintenance” functionxe “function”
5.2.5 The data recording for post analysis functionxe “function”
21 5.3 System technical states
5.4 Functional modes of a systemxe “system”
5.5 System configurationxe “configuration”
5.5.1 Operational configurationxe “configuration” of a systemxe “system”
22 5.5.2 Technical configurationxe “configuration”
5.5.3 BITxe “BIT” parameterisation
23 6 BITxe “BIT” types and metrics
6.1 Generalxe “BIT”
6.2 The various types of BITxe “BIT”
6.2.1 Power-up BITxe “BIT” or Power-on BIT (PBITxe “PBIT”)
24 6.2.2 Initiated BITxe “BIT” (IBIT) or Demanded BIT (DBIT)
6.2.3 Continuous BITxe “BIT” (CBIT)
6.2.4 External BITxe “BIT” (EBIT)
6.2.5 Maintenance BITxe “BIT” (MBIT)
25 6.2.6 Summary of characteristics of the various types of BITxe “BIT”
6.3 The metrics
6.3.1 Role of the mathematical definitions of the metrics
26 6.3.2 Detection rate
6.3.2.1 General
6.3.2.2 Failure detectionxe “detection” capability (FDCxe “FDC”)
6.3.2.3 Failure detectionxe “detection” probability (FDPxe “FDP”)
27 6.3.2.4 Comment
28 6.3.3 Isolation rate
6.3.3.1 Diagnostic and isolationxe “isolation”
29 6.3.3.2 Failure isolationxe “isolation” probability (FIPxe “FIP”)
30 6.3.3.3 Failure resolution probability (FRPxe “FRP”)
6.3.3.4 When is it more relevant to use the FIPxe “FIP” or FRPxe “FRP”?
31 6.3.4 Unreliabilisation rate caused by the BITxe “BIT”
6.3.5 False alarmxe “alarm” rates, false correct operation rates
6.3.5.1 General
32 6.3.5.2 Sensitivity and Specificity
33 6.3.5.3 Diagnostic value
34 6.3.5.4 Calculating the false alarmxe “false alarm” rate
36 7 Use of BITxe “BIT”
7.1 During development
7.2 During production
38 7.3 During service
7.3.1 In operational modexe “mode”
7.3.2 In maintenancexe “maintenance” modexe “mode”
7.4 During validation during repair
8 Architecture of the BITxe “BIT”
8.1 The generic functions of the BITxe “BIT”
8.1.1 Generalxe “function”
40 8.1.2 BITxe “BIT” Detection functionxe “function”
8.1.2.1 General
8.1.2.2 Test
8.1.2.3 Confirmation (optional)
8.1.3 BITxe “BIT” Supervisor functionxe “function”
8.1.3.1 Generalxe “diagnostic”
41 8.1.3.2 Operational diagnosticxe “diagnostic”
8.1.3.3 Context recording (optional):
8.1.3.4 System date (optional):
8.1.3.5 Maintenance diagnosticxe “diagnostic” (optional)
42 8.1.3.6 Data recording (optional)
8.1.3.7 Interface
8.1.3.8 Control of the BITxe “BIT” triggered (optional)
43 8.1.3.9 Inhibition (optional)
8.1.3.10 BITxe “BIT” parameterisation (optional)
8.2 The various architectures of the BITxe “BIT” functionxe “function”
8.2.1 General
44 8.2.2 Distributed BITxe “BIT” Architecture
8.2.3 Centralised BITxe “BIT” Architecture
45 8.2.4 Choice of BITxe “BIT” architecture
46 8.3 Exchanged data typology
47 8.4 Specification process
8.4.1 System design arbitrations: Essential objective and effort
49 8.4.2 The BITxe “BIT” specification process
8.4.2.1 General
8.4.2.2 For the BITxe “BIT” architecture
8.4.2.3 For the tests
50 8.5 Generic modelling and configurationxe “configuration” language
8.5.1 Introduction
52 8.5.2 General information
8.5.2.1 Introduction
8.5.2.2 BITxe “BIT” modelxe “model” applications
8.5.2.3 Utilities
53 8.5.2.4 Constraints
8.5.3 Description of the language tables
8.5.3.1 Generalxe “failure”
8.5.3.2 Table of services in failurexe “failure”
54 8.5.3.3 Table of Cut sets
55 8.5.3.4 Table of Signatures
57 8.5.3.5 Table of Cut sets/Signatures
58 8.5.3.6 Table of Direct dependencies:
59 8.5.3.7 Table of Degradation levels
8.5.4 Functional language
8.5.4.1 The operators
8.5.4.2 Words dedicated to the language
8.5.5 Model instantiation process
60 8.6 Development process and validation/verification of a BITxe “BIT” systemxe “system”
9 Prognosis
9.1 Aim of the prognosis
61 9.2 Organisation of the prognosis
9.3 Data from BITxe “BIT” for use by the Prognosis
10 Conclusions
63 Annex A (informative)Examples
A.1 Operational efficiency and performancexe “performance”
A.1.1 General
A.1.2 Example 1: How do you cut down a tree rapidly?
A.1.3 Example 2: How do you cut a slab of butter cleanly?
64 A.2 Example of calculations for some metrics
A.2.1 General
68 A.2.2 Calculating detectionxe “detection” rates
A.2.2.1 Calculating the FDCxe “FDC” (Failure Detection Capability)
69 A.2.2.2 Calculating the FDPxe “FDP” (Failure detectionxe “detection” probability)
70 A.2.3 Calculating isolationxe “isolation” rates
71 A.2.3.1 Calculating the FIPxe “FIP”n (Failure isolationxe “isolation” probability)
72 A.2.3.2 Calculating the FRPxe “FRP”n (Failure resolution probability)
76 A.3 Correct operation diagnosticxe “diagnostic” vs failurexe “failure” diagnostic
77 A.4 Example of propagation of the diagnosticxe “diagnostic” values on a simple architecture case
84 A.5 Ergodicity hypothesis
A.6 Example of calculation for assessing the NFFxe “NFF” — No faultxe “fault” found rate
86 A.7 Timing chart of events
88 Annex B (informative)List of recommendations

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BS EN 9721:2021
$215.11