Analisa kegagalan
Sponsored Links
This presentation is the property of its rightful owner.
1 / 31

ANALISA KEGAGALAN PowerPoint PPT Presentation


  • 157 Views
  • Uploaded on
  • Presentation posted in: General

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 .

Download Presentation

ANALISA KEGAGALAN

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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.

  • 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


  • 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


  • 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


Gate Symbols


FTA Steps


  • 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


  • 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


  • 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


  • 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

    • 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

    • 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


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

Risk Priority Number (RPN)

Severity

X

Occurrence

X

Detection

=

RPN


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


Truck Stop Coffee C&E Matrix


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


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


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


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


Step 5: Calculate RPNs


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


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


Akhir Perkuliahan…

… Ada Yang Ditanyakan


  • Login