JP2016167259A - システムの可用性、特にセーフティクリティカルシステムの可用性を解析するための方法および装置 - Google Patents
システムの可用性、特にセーフティクリティカルシステムの可用性を解析するための方法および装置 Download PDFInfo
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Abstract
Description
サブシステムと故障モードと故障影響と診断措置とを表す故障モード影響解析(FMEA)要素を含むデータベースに記憶された所定の共通システムメタモデルに基づき、前記システムの正常動作状態から偏差する、当該システムのシステム劣化状態を表す少なくとも1つの劣化モード要素を含む劣化モードツリー(DMT)を、自動生成するステップ。
サブシステムと故障モードと故障影響と診断措置とを表す故障モード影響解析(FMEA)要素を含むデータベースに記憶された所定の共通システムメタモデルに基づき、前記システムの正常動作状態から偏差する、当該システムのシステム劣化状態を表す少なくとも1つの劣化モード要素を含む劣化モードツリー(DMT)を、自動生成するように構成された、劣化モードツリー(DMT)生成ユニット。
前記システムの可用性を算出するため、生成された前記劣化モードツリー(DMT)を評価する処理ユニット。
FIT(&)=FIT(故障モード)×百分率(影響)×百分率(措置)
この場合、「グローバル劣化モードゲート」についての定量化は、以下の通りになる:
FIT(OR)=FIT(&1)+...+FIT(&n)
図4に示されたようなメタモデルを使用すると、従来のFMEA解析の欠点を解消することができる。図5に示されたような劣化モードツリーDMTは、全ての異なる劣化モードを含む。各劣化モードはそれぞれ、システム1の機能が完全である状態から偏差するモードを記述している。図5に示されたツリーの最上部要素によって、調査対象のシステム1の機能完全性の欠如の解析を行うことができる。各劣化モードを個別に解析するために、1つの劣化モード要素を使用することができる。
Claims (15)
- システム(1)の可用性を解析する方法であって、
(a)サブシステムと故障モードと故障影響と診断措置とを表す故障モード影響解析(FMEA)要素を含むデータベース(5)に記憶された所定の共通システムメタモデルに基づき、前記システム(1)の正常システム状態から偏差する、当該システム(1)のシステム劣化状態を表す少なくとも1つの劣化モード要素を含む劣化モードツリー(DMT)を、自動生成するステップ(S1)と、
(b)前記システム(1)の可用性を算出するため、生成された前記劣化モードツリー(DMT)を評価するステップ(S2)と
を有することを特徴とする方法。 - 前記メタモデルの各故障モード要素は、対応する故障影響要素を有し、
前記故障影響要素は、前記故障モードの実体が前記システム(1)に及ぼす故障影響についての情報を保有する、
請求項1記載の方法。 - 前記メタモデルの各故障影響要素は、対応する措置要素を有し、
前記措置要素は、相応する故障影響が前記システム(1)に生じるのを防止するための診断措置を表すものである、
請求項1または2記載の方法。 - 前記メタモデルの各措置要素は、前記システム(1)の劣化モードについての情報を保有する劣化モード要素に対応付けられている、
請求項1から3までのいずれか1項記載の方法。 - 前記システム(1)の各劣化モードに対し生じうる全ての故障影響と診断措置との組合せの論理和を表すグローバルな劣化モードゲート要素が、前記各劣化モード要素ごとに設けられている、
請求項1から4までのいずれか1項記載の方法。 - 前記グローバルな劣化モード要素はORゲートによって形成されている、
請求項5記載の方法。 - 劣化モード要素に割り当てられた各措置要素に対し、診断措置と、前記システム(1)の故障モードに対応する故障影響との対を表す措置ゲート要素が設けられており、
前記措置ゲート要素は、前記システム(1)の各劣化モードに対する、各故障モードと措置との組合せの寄与度を示すものである、
請求項1から6までのいずれか1項記載の方法。 - 前記措置ゲート要素はANDゲートによって形成されている、
請求項7記載の方法。 - 前記システムメタモデルの各故障モード影響解析(FMEA)要素はそれぞれ一意の識別子を有する、
請求項1から8までのいずれか1項記載の方法。 - サブシステム(2)を有するシステム(1)の可用性を解析するための装置(6)であって、
各サブシステム(2)は、それぞれ対応する故障影響を前記システム(1)に及ぼす少なくとも1つの故障モードを有し、
前記装置(6)は、
・サブシステムと故障モードと故障影響と診断措置とを表す故障モード影響解析(FMEA)要素を含むデータベース(5)に記憶された所定の共通システムメタモデルに基づき、前記システム(1)の正常動作状態から偏差する、当該システム(1)のシステム(1)劣化状態を表す少なくとも1つの劣化モード要素を含む劣化モードツリー(DMT)を自動生成するように構成された劣化モードツリー(DMT)生成ユニット(6A)と、
・前記システム(1)の可用性を算出するため、生成された前記劣化モードツリー(DMT)を評価するように構成された処理ユニット(6B)と
を有することを特徴とする装置(6)。 - 複数のサブシステム(2)を有するシステム(1)であって、
各サブシステム(2)は、それぞれ対応する故障影響を前記システム(1)に及ぼす少なくとも1つの故障モードを有し、
前記システム(1)は、当該システム(1)の稼働時間中に当該システム(1)の可用性を解析するように構成された、請求項10記載の装置(6)を含む
ことを特徴とするシステム(1)。 - 前記システム(1)はセーフティクリティカルシステムである、
請求項11記載のシステム。 - 前記システム(1)の各サブシステム(2)は、ハードウェア構成要素および/またはソフトウェア構成要素を含むシステム構成要素を有する、
請求項11または12記載のシステム。 - 請求項1から9までのいずれか1項記載の方法を実施するために構成された実行可能な命令を記憶するコンピュータプログラム製品。
- 前記コンピュータプログラム製品は、前記システム(1)の計画段階中に請求項1から9までのいずれか1項記載の方法を実施するように構成されたシステム計画ツールである、
請求項14記載のコンピュータプログラム製品。
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EP15155936.6A EP3059676B1 (en) | 2015-02-20 | 2015-02-20 | A method and apparatus for analyzing the availability of a system, in particular of a safety critical system |
EP15155936.6 | 2015-02-20 |
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CN105912413B (zh) | 2020-01-14 |
US20160246661A1 (en) | 2016-08-25 |
EP3059676A1 (en) | 2016-08-24 |
JP6141471B2 (ja) | 2017-06-07 |
EP3059676B1 (en) | 2019-09-11 |
CN105912413A (zh) | 2016-08-31 |
US10185612B2 (en) | 2019-01-22 |
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