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Relex-training讲义day2


Day Two:
零件選用及減額定分析:
Relex7.1對電子零件的定義及分類 Relex7.1對電子零件的減額定分析

應力分析法的應用
應力分析法(Stress)的導入

企業導入可靠度預估技術及資料庫之建立
BOM的導入及分析 Report和統計報表的建立 電子零件資料庫的建立 (

Part Number)對照表的建立

零件分類與減額定分析

零件標準化
目的:
將標準件的使用率提升到最高,零件的使用 種類減到最少。

工作項目:
所有In-house與廠商設計所使用的零件必須 來自同一個PPSL(計劃零件選用清冊) 對於未列入PPSL的零件必須在使用前做評估

設計與標準化
設計工程師 尋找符合設計 需求的零件 零件工程師 提供符合需求 及更經濟的標 準件

符合需求 可靠度 可用度 維護度

零件選用與可靠度
適合可靠度分析的零件選用標準:
簡單化的設計 模組化與標準化

配合項目:
公司內部需建立零件標準化的制度 衛星廠商必須提供標準化的零件

零件標準化的好處
建立標準件則更能掌握零件品質 在新設計中採用標準件可避免因使用非 標準件而需進行重複的可靠度測試與性 能測試 符合政府和國際法規的標準 更快導入產品可靠度分析,提昇產品品 質

減額定分析
目的:
為提昇可靠度,在零件的規範或範圍內限制 應力的應用水準。

一般計算式
減額定比=工作值 / 額定值

減額定設計是提昇產品可靠度最有效的 方法之一

Relex is based on Standards
Reliability Prediction Derating is based on:
AS-4613 Class A, B, and C MIL-STD-1547 MIL-STD-975M TE000-AB-GTP-010 Rev 1

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AS-4613
Current thermal derating guidelines do not account for the dominant failure mechanisms or their temperature dependencies [Brummet 1982, Eskin 1984, Naval Air Systems Command AS- 4613 1976, Westinghouse 1986]. Temperature- cycle effects that have not been accounted for in device derating criteria are failure accelerators at mating interfaces.

MIL-STD-1547B
MIL-STD-1547B NOT 1 Title: ELECTRONIC PARTS, MATERIALS, AND PROCESSES FOR SPACE AND LAUNCH VEHICLES (S/S BY MIL-HDBK-1547)

MIL-STD-975M
MIL-STD-975M(2) NOT 3 Title: NASA STANDARD ELECTRICAL, ELECTRONIC, AND ELECTROMECHANICAL (EEE) PARTS LIST (NO S/S DOCUMENT)

TE000-AB-GTP-010
Part Requirement & Application Manual TE000-AB-GTP-010 Revision 2 CHAPTERS Cover, Preface, Table of Contents Scope Resistors Capacitors Thermistors Magnetic Devices Optoelectronic Devices Discrete Semiconductors Microcircuits MCMs & Hybrids

減額定分析
典型的功率與電壓、電流減額定值與減額定設 計曲線如下(Relex 7.1提供)

Knee Temperature:最大額定溫度 TMAX:最大接面溫度

如何建立Derating Files
What? A table of maximum/minimum stress
values allowed for each part type

Why? Provides an easy way to review data

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如何建立Derating Files
Additional Notes:
Relex built-in derating available Custom user defined derating files can be created Several Derating files are supplied (each based on a standard)

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如何建立Derating Files
Use in conjunction with Project files:
1. Create a Derating file, as needed. 2. Activate the Derating file. 3. Enter parts/part data & calculate the prediction. 4. Determine if any parts are operating at an overstressed condition.

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Derating Files的分析
How do I know a part is “overstressed?”
1. Failure rate is RED in Parts Table. 2. Checkbox next to failure rate on Pi Factors window. 3. Part is included on overstressed ancillary report.
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Derating Files的分析
What do I do if part is “overstressed?”
1. Determine which stress value(s) are “out of range.” 2. Consider changing the operating conditions for the part.

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減額定分析的效益
相同元件因製造商或生產線不同會有差 異,藉由減額定的設計作為變異的補償。 保證元件在某種應力水準下能長期使用 提高使用的安全性

應力分析法的應用

應力分析法
使用時機:
細部設計階段 大部分的設計參數均已完成 已具備詳細零件清單及設計應力參數 零件使用應力和使用環境均有詳細資料可以 查詢

應力分析法
應力分析預估模式(一般式)
λp = λb * ΠΕ* ΠQ * ΠC * ΠS * ΠA * ΠL * ΠT

參數說明
零件基礎失效率(可由 可由MIL-HDBK-217 λb:零件基礎失效率 可由 手冊圖表中查得) 手冊圖表中查得

應力分析法
λp = λb * ΠΕ* ΠQ * ΠC * ΠS * ΠA * ΠL * ΠT

ΠΕ(環境因素:Environment factor) 環境因素:Environment
Π值隨著操作環境而不同 MIL-217-F2環境區分較為複雜 環境區分較為複雜 Bellcore issue6則為一般商用的操作環境 則為一般商用的操作環境

MIL-217的作業環境
GB, GC - Ground Benign, Controlled GF, GU - Ground Fixed, Uncontrolled GM - Ground Mobile NS - Naval Sheltered NU - Naval Unsheltered AIC, AC - Airborne Inhabit Cargo, Commercial AIF - Airborne Inhabit Fighter AUC - Airborne Uninhab Cargo AUF - Airborne Uninhab Fighter ARW - Airborne Rotary Winged SF, SC - Space Flight, Commercial MF - Missile Flight ML - Missile Launch CL - Cannon Launch

Bellcore的作業環境
GB, GC - Ground Benign, Controlled GF, GU - Ground Fixed, Uncontrolled GM - Ground Mobile AIC, AC - Airborne Inhabit Cargo, Commercial SF, SC - Space Flight, Commercial

應力分析法
λp = λb * ΠΕ* ΠQ * ΠC * ΠS * ΠA * ΠL * ΠT 品質因素:Quality factor) ΠQ (品質因素 )
品質等級依不同零件區分成數級: 品質等級依不同零件區分成數級:

Microelectronics Semiconductors Capacitors Resistors

S,S-1,B,B-1,B-2,D,D-1 JANTXV,JANTX,JAN D,C,S,R,B,P,M,L S,R,P,M

應力分析法
λp = λb * ΠΕ* ΠQ * ΠC * ΠS * ΠA * ΠL * ΠT 複雜性因素:Quality factor、構造因 ΠC (複雜性因素 、 或接點因素:Contact 素:Construction factor或接點因素 或接點因素 factor) ) 和零件的電路、構造型態、 和零件的電路、構造型態、接點型式有關

應力分析法
λ p = λ b * Π Ε * Π Q * Π C * Π S * Π A * Π L* Π T 電性應力因素:Electrical Stress factor) Πs (電性應力因素
零件隻實際操作值與額定值之比率

應用因素:Application factor) ΠA (應用因素
對於半導體元件,在電路上之應用予以適當的修正 對於半導體元件, 因素

應力分析法
λp = λb * ΠΕ* ΠQ * ΠC * ΠS * ΠA * ΠL * ΠT 學習因素:Learning factor) ΠL(學習因素
評估製造程序的純熟度 零件生產時間超過兩年則不予考慮 零件生產時間在兩年之內則必須加入此修正係數

溫度因素:Temperature factor) ΠT(溫度因素
零件的操作溫度、 零件的操作溫度、接面溫度等等

應力分析法
使用Relex7.1來做應力分析

設 定 環 境 的 作



Π值

企業導入可靠度預估技術及資 料庫之建立

Relex7.1軟體操作Training
BOM的導入及分析 Report和統計報表的建立 電子零件資料庫的建立 (Part Number)對照表的建立

BOM的導入及分析

Relex CAD Interface
Export data in variety of formats Import data from various formats Automated with CAD Import/ExportWizardtm

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Why Import or Export?
Import data from “some other” program Import BOM from a CAD Program Import parts lists to Parts Library files Share Relex data with other programs

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Supported File Types
Program Specific files Text files Special files

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Program Specific Files
Microsoft Access Microsoft Excel Microsoft FoxPro dBASE Lotus Paradox

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Text Files
Keyword files Delimited files Bill of Materials files

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Text Files -- Keyword

pn = 74LS00, qty = 1, ref = U1 pn = 74LS04, qty = 2, ref = U2-U3 pn = 2N222A, qty = 1, ref = Q1
The information above is shown as it would appear in a Text Editor.
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Text Files -- Delimited

74LS00, 1, U1 74LS04, 2, U2-U3 2N222A, 1, Q1
The information above is shown as it would appear in a Text Editor.
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Text Files -- BOMs

74LS00 74LS04 2N222A

1 2 1

U1 U2-U3 Q1

The information above is shown as it would appear in a Text Editor.
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Importing & Exporting
Specific Part Data

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Import/Export Specific Data

All Specific Fields - Long Format All Specific Fields - Short Format Specific Data (individual fields)

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All Specific Fields
To import/export all specific data fields One piece of data per field CAD Interface Supplement
Supplies order of fields Supplied as document on cd (Docs)

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{All Specific Fields Long Format}
Fixed file structure Same number of fields in each record

*Useful to sharing data with programs like Access, dBASE, FoxPro.

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{All Specific Fields Short Format}
Varied file structure Number of fields per record varies

*Useful to sharing data with programs like Excel.

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{Specific Data}
Identify individual specific part data field Specify field based on part type Assign with CAD Import/Export Wizardtm

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Report和統計報表的建立

Reporting with Relex
Step #1: Customize a Report Design file Step #2: Generate the Report

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Relex Report Design File
Created in Built-in Report Designer Created based on Database Type Four Main Sections
Report Header Page Header Details Page Footer

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電子零件資料庫的建立

Library Files
What? A database or table that contains
standard parts and their parameters

Why? Simplifies part and part data entry

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Library Files
Additional Notes:
Relex Libraries are available Custom User Libraries can be created

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Library Files
Use in conjunction with Project files:
1. Create a Library file, as needed. 2. Activate the Library file. 3. Enter a part number (press <TAB>). 4. Relex pulls the associated data from the Library file into the Project file.

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(Part Number)對照表的建立

Correlation File
A list matching in-house part numbers & library part numbers Examples: In-House PN ACME1 ACME2

Library PN 74LS00 2N2222
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Correlation File
Use in conjunction with Project files:
1. Create a Correlation file. 2. Activate the Correlation file. 3. Enter a part number (press <TAB>). 4. Relex pulls the data for the “associated” Library part into the Project file.
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Any Questions?

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