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Model Based Safety Analysis PowerPoint PPT Presentation


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Model Based Safety Analysis. Agenda. Safety activities within Engineering Process SIMFIA for model making and processing as integrated in the whole process Modelling approach for MBSA MBSA with SIMFIA for Airworthiness SIMFIA references. Concept and. In . Feasibility studies.

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Model Based Safety Analysis

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Model Based

Safety

Analysis


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Agenda

  • Safety activities within Engineering Process

  • SIMFIA for model making and processing as integrated in the whole process

  • Modelling approach for MBSA

  • MBSA with SIMFIA for Airworthiness

  • SIMFIA references


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Concept and

In

Feasibility studies

Concept and

Development

In

Feasibility studies

Development

Definition

Service

Definition

DELIVERY

Service

In service Follow up

Change Ctrl

PROCESS CONTROL , TECHNICAL STUDIES, TRAINING, DISSEMINATION

CONFIGURATION MANAGEMENT

PROCESS

DEFINITION

Item Verification

Aircraft Requirements Identification

System Requirements Identification

Item Requirements Identification

Item Design

Aircraft Verification

System Verification

Aircraft Verification

Aircraft FHA

Aircraft Synthesis

System

Integration

System

Allocation

PASA

Aircraft CCA

Aircraft CCA

Item Verification

Validation of requirements at the next highest level

System FHA

System SSA

Item

Integration

Item

Allocation

System PSSA

System CCA

System CCA

System Verification

Validation of requirements at the next highest level

Bottom Up

Safety

Requirements

verification

Item FMEA

Item FMEA

Top down RAM and

safety

Development

Requirements &

validation

Item FTA

Item FTA

Item CMA

Item CMA

Validation of requirements at the next highest level

Item Software Design

SIMFIA

Item Hardware Design

Technological Design

Safety Activities during development cycle


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Interoperability of SIMFIA workbench designedto produce and process the models

System

Design

Functional

Hazard

Analysis

Additional

Analysis

Troubleshooting /

Testability

Operaters /

Users

Support

RAMS

Analysis

Safety

Analysis

FAULT

TREE

Qualitative

Quantitative

Assessment

Safety

Demonstration

Specification

Information

Data

Sheet

Demonstration

Report

Design

Information

SIMFIA

Design process

MODELS

SAFETY

FMECA

SIMFIA

Development process

SIMUL

RELDIAG

RAMS tasks

Doc / Report


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Top Down

Model Structure

DESIGN

INFORMATION

REPOSITORY

SYSTEM

SUB SYSTEM

-n

Datasheets

for

Reports

EQUIPMENT

-n

RAMS

INFORMATION

DATA BASES

-n

-n

Functional/

Hazard

analysis

Bottom Up

RAMS

analysis

  • Model Processing

  • consistensy check

  • completeness check

  • scenario simulations

System

Engineering

Tool / Workbench

Framework

Data /

Information /

Model

Patterns

Safety

analysis

Simulation/

Diagnosis


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SAFETY

Fault tree

RELDIAG

(Reliability Diagram)

COST

Life cycle cost

Structure of SIMFIA

SIMUL

SOFIA

Functional and

Function / Hazard Simulation

SOFIA

Dysfunctional analysis

SIMFIA

SIMFIA

SIMFIA

SIMFIA

R.A.M.S Software

R.A.M.S Software

R.A.M.S Software

R.A.M.S Software

Logistic

Data

Base

F.M.E.C.A

Fault Modes, Effect and

Criticality Analysis

Spreadsheets

OPTIM

OPTIM

-

-

STOCK

STOCK

(ASCII, ...)

SIMLOG

Initial spares allocation

Initial spares allocation

SIMLOG

Logistic Support Analysis

Software

Logistic Support Analysis

COST

COST

Life cycle cost

Life cycle cost

Level Of Repair Analysis

LORA

Level Of Repair Analysis


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Modelling Methodology for MBSA

  • Top Down approach: from need to solution….

    • First step: specification production

    • Second step:solution functional specification

    • Third step: physical specification.

    • Last step: manufacturing


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SOW

Step 1

Specification

System

Step 2

FunctionalDesign

F2

F1

Step 3

PhysicalDefinition

Soft

Step 4

Manufacturing

Hard

Modeling Method in MBSA approach


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Reminder about the Safety process

  • The steps along the Safety process are following:

    • Functional Hazards Assessment (FHA) : A Functional Hazard Assessment is defined as a systematic, comprehensive examination of functions to identify and classify failure conditions of those functions according to their severity

    • Preliminary System Safety Assessment (PSSA): A PSSA is used to complete the failure conditions list and the corresponding safety requirements.

    • System Safety Assessment (SSA): A System Safety Assessment is a systematic, comprehensive evaluation of the implemented system to show that relevant safety requirements are met.

      • The SSA is a verification that the implemented design meets both the qualitative and quantitative safety requirements as defined in the FHA and PSSA

      • Therefore it needs, both qualitative and quantitative verification means such as FTA, FMEA, FMES etc…


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FHA with SIMFIA

  • FHA PROCESS:

    • Identification of all the functions associated with the level under study (internal functions and exchanged functions)

    • Identification and description of failure conditions associated with these functions, considering single and multiple failures in normal and degraded environments

    • Determination of the effects of the failure condition

    • Classification of failure condition effects on the aircraft (Catastrophic, Severe-Major/Hazardous, Major, Minor and No Safety Effect)

    • Assignment of requirements to the failure conditions to be considered at the lower level

    • Identification of the supporting material required to justify the failure condition effect classification

    • Identification of the method used to verify compliance with the failure condition requirements


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FHA with SIMFIA

  • The FHA is an oriented analysis of the system. SIMFIA can be used as a support for such analysis using a specificication « high level » model


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FHA with SIMFIA

  • High level / functional view of the system.


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FHA with SIMFIA

  • User data to input the columns content for each Failure condition

  • This allows to document all functional knowledge of the system in a Simfia Model for further processing of this knowledge

  • Fully FHA – compliant output


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PSSA / SSA with SIMFIA

  • PSSA / SSA Process

    • Preliminary / Final technical « breakdown » of the functions

      •  Model all equipments and link them to the functions


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  • ATA32_LANDING_GEARS Breakdown


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  • COCKPIT_ATA_32 Breakdown


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PSSA / SSA with SIMFIA

  • The functionnal model can be used to generate the table containing all quantitative objectives

  • There again thanks to user data available in SIMFIA


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PSSA / SSA with SIMFIA

  • The expected probability can then be evaluated using the full model with technical equipments for each FC using FTA analysis (one FTA per phase)


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SIMFIA V2 connectors to capture external information

  • Functional Analysis languages: SADT, SART, APTE…

  • Hardware Modelling languages : EXPRESS , SIMLULLINK, MACAR…

  • Performance analysis languages: PETRI, Queue Network…

  • Formal languages: STATE MATE…


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SIMFIA references in aeronautics


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SIMFIA references in other domains


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