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FDIR 故障檢測和隔離 Fault detection and isolation
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FDIR ist die Abkürzung für Fault-Detection, Fault-Isolation and Recovery Techniques, manchmal auch Fault-Detection, Fault-Isolation and Restoration/Reconfiguration und manchmal, je nach Schärfe der Definition, auch als Fault Detection and Exclusion (FDE) oder Error Detection and Correction (EDAC) bezeichnet. Autonom arbeitende Systeme wie Satelliten sind bereits rudimentär mit FDIR-Techniken ausgestattet. Liefert beispielsweise ein Sensor unerwartete Daten, erkennt das System ihn als Fehlerursache, schaltet ihn ab und aktiviert redundante Komponenten. 故障檢測和隔離(Fault detection and isolation,FDI)是控制工程中的子領域,主要是監控系統,在故障發生時可以識別,並且準確指出故障的種類以及出現位置。有兩種進行故障檢測和隔離的作法:針對感測器故障時訊號的直接的模式識別,或者是根據特定模型推導感測器的理想值,再去分析感測器讀值以及理想值的差異程度。以後者而言,若偏差值超過一定範圍,就會認為有偵測到故障。接下來的故障隔離工作是確認是哪一種的故障,以及故障出現機械的哪個位置。故障檢測和隔離一般會分為兩類:以模型為基礎的故障檢測和隔離,以及以信號處理為基礎的故障檢測和隔離。 Fault detection, isolation, and recovery (FDIR) is a subfield of control engineering which concerns itself with monitoring a system, identifying when a fault has occurred, and pinpointing the type of fault and its location. Two approaches can be distinguished: A direct pattern recognition of sensor readings that indicate a fault and an analysis of the discrepancy between the sensor readings and expected values, derived from some model. In the latter case, it is typical that a fault is said to be detected if the discrepancy or residual goes above a certain threshold. It is then the task of fault isolation to categorize the type of fault and its location in the machinery. Fault detection and isolation (FDI) techniques can be broadly classified into two categories. These include model-based F
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故障檢測和隔離(Fault detection and isolation,FDI)是控制工程中的子領域,主要是監控系統,在故障發生時可以識別,並且準確指出故障的種類以及出現位置。有兩種進行故障檢測和隔離的作法:針對感測器故障時訊號的直接的模式識別,或者是根據特定模型推導感測器的理想值,再去分析感測器讀值以及理想值的差異程度。以後者而言,若偏差值超過一定範圍,就會認為有偵測到故障。接下來的故障隔離工作是確認是哪一種的故障,以及故障出現機械的哪個位置。故障檢測和隔離一般會分為兩類:以模型為基礎的故障檢測和隔離,以及以信號處理為基礎的故障檢測和隔離。 Fault detection, isolation, and recovery (FDIR) is a subfield of control engineering which concerns itself with monitoring a system, identifying when a fault has occurred, and pinpointing the type of fault and its location. Two approaches can be distinguished: A direct pattern recognition of sensor readings that indicate a fault and an analysis of the discrepancy between the sensor readings and expected values, derived from some model. In the latter case, it is typical that a fault is said to be detected if the discrepancy or residual goes above a certain threshold. It is then the task of fault isolation to categorize the type of fault and its location in the machinery. Fault detection and isolation (FDI) techniques can be broadly classified into two categories. These include model-based FDI and signal processing based FDI. FDIR ist die Abkürzung für Fault-Detection, Fault-Isolation and Recovery Techniques, manchmal auch Fault-Detection, Fault-Isolation and Restoration/Reconfiguration und manchmal, je nach Schärfe der Definition, auch als Fault Detection and Exclusion (FDE) oder Error Detection and Correction (EDAC) bezeichnet. Beispielsweise versucht man Softwaresysteme mit Selbstheilungsalgorithmen auszustatten. Das Programm soll ohne Eingriff von außen in der Lage sein, Ausfälle zu erkennen (fault-detection, Watchdog). Im nächsten Schritt versucht das System, den Fehler einzukreisen und zu bestimmen (fault-isolation, beispielsweise Ausschalten defekter Komponenten), um dann geeignete Korrekturen durchzuführen (recovery, zum Beispiel Umschalten auf Ersatzkomponenten und Systemneustart). Ein weiteres Beispiel ist die fehlertolerante Kodierung von Daten, beispielsweise mit einem Hamming-Code und Prüfsumme. Einzelne fehlerhafte Bits in Datenwörtern können erkannt und korrigiert werden. Bei steigender Fehlerdichte versagt zunächst die Korrektur, anschließend die Lokalisierung falscher Datenworte, schließlich das Erkennen von Fehlern generell. Autonom arbeitende Systeme wie Satelliten sind bereits rudimentär mit FDIR-Techniken ausgestattet. Liefert beispielsweise ein Sensor unerwartete Daten, erkennt das System ihn als Fehlerursache, schaltet ihn ab und aktiviert redundante Komponenten.
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