Analisa kegagalan
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ANALISA KEGAGALAN. S2 TMI – UB 2010/2011. Fault Tree Analysis Failure Mode and Effect Analysis. Metode Pengukuran Resiko. Probabilitas : peluang atau kemungkinan kemunculan satu kejadian .

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ANALISA KEGAGALAN

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Analisa kegagalan

ANALISA KEGAGALAN

S2 TMI – UB

2010/2011


Metode pengukuran resiko

  • Fault Tree Analysis

  • Failure Mode and Effect Analysis

Metode Pengukuran Resiko


Definition

  • Probabilitas: peluang atau kemungkinan kemunculan satu kejadian.

  • Resiko: peluang kemunculan satu kejadian yang tidak diharapkan serta tingkat kritis dampak yang diakibatkan.

  • Pengukuran Resiko: proses kategorisasi resiko secara kualitatif atau estimasi resiko kuantitatif.

  • Manajemen Resiko : proses identifikasi resiko, pengukuran resiko, disposisi resiko serta monitor dan kontrol resiko.

Definition


Definition1

  • Reliability: The probability that an item will perform its intended function for a specified mission profile.

  • Safety: The freedom of injury, damage, or loss of resources.

  • Hazard: The condition that can result in or contribute to a mishap.

  • Mishap: An unintended event that can cause injuries, damage, or loss of resources.

Definition


Fault tree analysis

  • Failure or Fault Tree Analysis (FTA) merupakan pendekatan deduktif top-down yang merepresentasi hubungan antar kejadian secara grafis dan logik di mana status kejadian di level yang lebih rendah mempengaruhi status kejadian di level yang lebih tinggi

  • FTA menjadi alat sistematis untuk mendeskripsikan bagaimana interaksi antar elemen sistem yang mempengaruhi terjadinya kegagalan sistem.

Fault Tree Analysis


Event symbol

Event Symbol


Gate symbols

Gate Symbols


Fta steps

FTA Steps


Failure mode effect analysis

  • Failure Mode & Effect Analysis (FMEA) merupakan metode analisis manual untuk menentukan konsekuen dari kegagalan komponen, modul atau subsistem

  • FMEA berwujud tabel spreadsheet yang mengidentifikasi macam kegagalan (failure mode), akibat kegagalan (failure effect), penyebab (possible causes), frekuensi kejadian (probability of occurrence), dampak kegagalan (severity) konsekuenconsequences, and proposed safeguards are noted.

Failure Mode & Effect Analysis


Fmea steps

  • 1.For each process input (start with high value inputs), determine the ways in which the input can go wrong (failure mode)

  • 2.For each failure mode, determine effects. Select a severity level for each effect

  • 3.Identify potential causes of each failure mode. Select an occurrence level for each cause

  • 4.List current controls for each cause. Select a detection level for each cause

FMEA Steps


Fmea steps1

  • 5. Calculate the Risk Priority Number (RPN)

  • 6.Develop recommended actions, assign responsible persons, and take actions. Give priority to high RPNs.

  • 7.Assign the predicted severity, occurrence, and detection levels and compare RPNs

FMEA Steps


Failure modes and effects

  • The relationship between failure modes and effects is not always 1 to 1

Failure Modes and Effects

Failure Mode 1

Effect 1

Failure Mode 2

Effect 2

Failure Mode 1

Effect 1

Failure Mode 2

Effect 1

Failure Mode 1

Effect 2


Severity occurrence and detection

  • Severity

    • Importance of the effect on customer requirements

      • Often can’t do anything about this

  • Occurrence

    • Frequency with which a given cause occurs and creates failure modes

  • Detection

    • The ability of the current control scheme to detect or prevent a given cause

Severity, Occurrence, and Detection


Severity occurrence and detection1

  • Severity

    • 1 = Not Severe, 10 = Very Severe

  • Occurrence

    • 1 = Not Likely, 10 = Very Likely

  • Detection

    • 1 = Likely to Detect, 10 = Not Likely to Detect

Severity, Occurrence, and Detection


Risk priority number rpn

  • RPN is the product of the severity, occurrence, and detection scores.

Risk Priority Number (RPN)

Severity

X

Occurrence

X

Detection

=

RPN


Analisa kegagalan

Truck Stop Coffee Process Map

Outputs

Inputs

Outputs

Inputs

Complete Order

Customer

Order

Size Specification

Hot Water

Soap

Scrubber

Cleaned Carafe

Dirty Water

Wet Scrubber

Receive Coffee Order

Clean Carafe

Clean Carafe

Cold Water

Measuring Mark

Full Carafe

Fill Carafe w/Water

Complete Order

Hot Coffee

Cup

Filled Cup

Pour Coffee into Cup

Filled Maker

Empty Carafe

Full Carafe

Customer Reply

Amount Specified

Complete Order

Pour Water into Maker

Filled Cup

Customer

Cream

Sugar

Amount Desired

Offer Cream & Sugar

Filter

Maker w/Filter

Place Filter in Maker

Maker w/Filter & Coffee

Maker w/Filter

Fresh Coffee

Dosing Scoop

Put Coffee in Filter

Complete Order

Money

Make Change

Temperature

Taste

Strength

Complete Transaction

Operating Maker

Heat

Brewed Coffee

Maker w/Filter & Coffee

Turn Maker On

Say Thank You

Smile

Happy Customer

Coffee Delivery

Hot Coffee

Brewing Coffee

Select Temperature Setting


Analisa kegagalan

Truck Stop Coffee C&E Matrix


Analisa kegagalan

Step 1: For Each Input, Determine the Potential Failure Modes


Analisa kegagalan

Step 2: For Each Failure Mode, Identify Effects and Assign Severity


Analisa kegagalan

Step 3: Identify Potential Causes of Each Failure Mode and Assign Score


Analisa kegagalan

Step 4: List Current Controls for Each Cause and Assign Score


Analisa kegagalan

Step 5: Calculate RPNs


Analisa kegagalan

Step 6: Develop Recommended Actions, Assign Responsible Persons, and Take Actions


Analisa kegagalan

Step 7: Assign the Predicted Severity, Occurrence, and Detection Levels and Compare RPNs


Analisa kegagalan

Akhir Perkuliahan…

… Ada Yang Ditanyakan


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