Architecture Modeling - SPES 2020

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Natural Language Requirement: The system shall operate with 97% availability. Pattern based RSL: availability of system shall be >= 0.97 Pattern P2: number of event in time shall be comparator n [on average] In the specified time there shall be “>”,”
Pattern S3: Failure shall not be caused by n independent failures This pattern allows to specify that components have to be redundant and their failure may not be caused be a given number of other failures. Natural Language Requirement: Loss of engine shall not be caused by 2 independent failures. Pattern based RSL: EngineLoss shall not be caused by 2 independent failures Pattern hazard Hazard shall not occur with density higher than n per S4: reference This pattern can be used to express an hazard and specify its density. Example Pattern: hazard UnannunciatedLossOfDecelerationCapability shall not occur with density higher than 10E-9 per flightHour. There are also some patterns that allow to define some elements of the upper safety related patterns: Pattern S5: Function is realized by function_list This pattern is used to specify break-down of functions during system decomposition; function is linked to a set of functions of sub-components. In order to run safety analysis on a model, it is necessary to fully represent the flow and impact of failures. Hence the decomposition of functions has to be expressed. The commonly used black box view of components does not support the reference of elements inside a component from the outside. Since this is necessary for this decomposition a grey-box view is used. [speeds reference] Natural Language Requirement: The ABS system shall consist of the measuring unit for wheel slip and the braking system Pattern based RSL: ABSSystem is realized by WheelSlipMeasurin && BrakingSystem Pattern S6: <strong>Architecture</strong> <strong>Modeling</strong> Failure is represented by failure_list This pattern is used to specify break-down of failures during system decomposition, failure is linked to a set of failures of sub-components. (see previous pattern for grey-box view). Natural Language Requirement: The braking system shall fail if the hydraulic system A fails and hydraulic system B fail. Pattern based RSL: BrakingSystemFails is represented by HydraulicSystemAFails && HydraulicSystemBFails 131/ 156
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Architecture Modeling ∗ Andreas B
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Contents 1 Introduction 1 2 Quick-T
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1 Introduction This document propos
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Architecture Modeling allowing to m
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Architecture Modeling creating a vi
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Architecture Modeling the design it
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Architecture Modeling of the logica
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Architecture Modeling realization o
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Architecture Modeling can usually o
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3 The Architecture Meta-Model In Se
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Abstraction-Levels (detail increase
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3.2.2 Functional Perspective Archit
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Architecture Modeling The semantics
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Architecture Modeling expressed by
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Architecture Modeling computing cap
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3.2.5 Geometrical Perspective Archi
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ShapeCompositionOperator intersecti
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Architecture Modeling The constrain
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Architecture Modeling of particular
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Architecture Modeling Shape that de
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Architecture Modeling Conjugation o
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RichComponent Architecture Modeling
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MultiplicityElement +part 0..* Rich
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ComponentC Architecture Modeling pa
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4 Steps in Component-Based Design T
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Architecture Modeling Assume/guaran
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Architecture Modeling When specifyi
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Architecture Modeling next selectio
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Architecture Modeling ports must ha
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established if (and only if): Archi
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12°C < tempSelect < 35°C actTemp
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Architecture Modeling The component
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Architecture Modeling 4.3.2 Establi
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Architecture Modeling a mapping is
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Architecture Modeling Another impor
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5 Using the Architecture Meta-Model
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Architecture Modeling Design proces
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Architecture Modeling abstraction l
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Pwr1 Pedal_Pos1 Pwr2 Pedal_Pos2 CMD
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Architecture Modeling Figure 5.4: O
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Architecture Modeling Figure 5.7: L
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Page 89 and 90: Architecture Modeling However this
Page 91 and 92: Architecture Modeling The considera
Page 97 and 98: Architecture Modeling tasks Command
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Page 101 and 102: Architecture Modeling thus decorate
Page 103 and 104: Architecture Modeling In summary, P
Page 105 and 106: Architecture Modeling OEMs are incr
Page 107 and 108: Architecture Modeling provide effec
Page 111 and 112: Architecture Modeling patterns, cap
Page 113 and 114: Architecture Modeling 6.1 Syntax an
Page 115 and 116: 6.1.1.1.1 Attribuute Definit tion a
Page 117 and 118: Constrrain Eventts with Co ondition
Page 119 and 120: These events used in the “and the
Page 121 and 122: Formalization: whenever StartButton
Page 123 and 124: Architecture Modeling Basic bloock
Page 125 and 126: 6.1.1.1.1.3 Conditions Conditions c
Page 127 and 128: 6.1.1.1.2.2 Seammless Con ncatenati
Page 129 and 130: e3 && (clk==0) e1 idle pre e1 idle
Page 131 and 132: Pattern whenever event occurs condi
Page 133: If the brake force is above 80% for
Page 137 and 138: Pattern S9: failureCondition failur
Page 139 and 140: Pattern R2: Event occurs each perio
Page 141 and 142: idle e1 |clk:=0 e2 && (l
Page 143 and 144: The function : allocates a singl
Page 145 and 146: Examplees of clocks: • Run: {c=0@
Page 147 and 148: Architecture Modeling 1. For σ ∈
Page 149 and 150: Architecture Modeling Traces accord
Page 151 and 152: Architecture Modeling Definition 6.
Page 153 and 154: Architecture Modeling the one given
Page 155 and 156: Architecture Modeling Decomposition
Page 157 and 158: Bibliography [1] ARINC 653 - Avioni
Page 159 and 160: Architecture Modeling [26] Holger G
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Architecture Modeling - SPES 2020

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