FMEA training(中英文對照)

1、FMEA,Training,目 錄(Contents),一、何謂FMEA (What is an FMEA) 二、FMEA的種類 (The Type of FMEA) 三、FMEA的實施 (FMEA Implementation) 四、FMEA的持續(xù)追蹤 (Follow-Up) 五、DFMEA填表說明 (Design FMEA) 六、PFMEA填表說明 (Process FMEA),何謂 FMEA(What is an FMEA),FMEA:失效模式與效應(yīng)分析(Failure Mode and Effects Analysis) FMEA係藉由系統(tǒng)性的小組活動來進行下列工作: An FMEA

2、can be described as a systematic group of activities intended to: a.確認(rèn)及評估產(chǎn)品/製程潛在的失效模式及其影響 Recognize and evaluate the potential failure of a product/process and effects of that failure b.採取消除或降低潛在的失效發(fā)生機率 Identify actions that could eliminate or reduce the chance of the potential failure occurring c.記

3、載全部的過程 Document the entire process,FMEA的種類(The Type of FMEA),DFMEA : D Design設(shè)計 PFMEA : P Process製程 SFMEA : S System系統(tǒng) MFMEA : M Machinery機械設(shè)備,將FMEA當(dāng)作一專門的技術(shù)應(yīng)用，以消除潛在失效為目的。 Using the FMEA as a disciplined technique to identify and help minimize potential concern 全面實施FMEA確實能避免許多宣傳活動的發(fā)生。 Studies of vehi

4、cle campaigns have shown that fully implemented FMEA programs could have prevented many of the campaigns. 要完成FMEA得依靠小組共同努力。 FMEA input should be a team effort. 小組成員應(yīng)由知識或技術(shù)豐富人員共同組成而非應(yīng)付式的派遣單位助理來權(quán)充人數(shù)。 Team member should be knowledgeable and technical expert, and not the assistants combined from each de

5、partments.,FMEA的實施(FMEA Implementation),適時性是成功實施FMEA的重要因素之一，強調(diào)事前的防範(fàn)，而非事後事故的補救。 One of the most important factors for the successful implementation of an FMEA program is timeliness. It is meant to be a “before-the-event” action, not an “after-the-fact” exercise. FMEA不僅是簡單的填表工作，而是藉由對FMEA的瞭解，以消除風(fēng)險，使計劃獲

6、得適當(dāng)?shù)墓苤?，藉以達到客戶的滿意。 It is not simply a case of filling out the form but rather of understanding the FMEA process in order to eliminate risk and plan the appropriate controls to ensure customer satisfaction.,FMEA的實施(FMEA Implementation),7.潛在FMEA實施步驟:,FMEA的實施(FMEA Implementation),7. FMEA Process Sequenc

7、e:,FMEA的實施(FMEA Implementation),What are the Functions, Features or Requirements?,What can go wrong? -No Function -Partial /Over /Degraded Function -Intermittent Function -Unintended Function,實施FMEA的三種時機 There are three basic cases for which FMEAs are generated,each with a different scope or focus.

8、1.新設(shè)計、新技術(shù)或新製程 New design, new technology, or new process 2.當(dāng)現(xiàn)有設(shè)計或製造將要變更時 Modifications to existing design or process 3.當(dāng)現(xiàn)有設(shè)計或製程使用新的環(huán)境、位置或應(yīng)用時 Use of an existing design or process in a new environment, location, or application,FMEA的實施(FMEA Implementation),FMEA的推動雖由指定專人負責(zé),但其作業(yè)展開，應(yīng)由FMEA小組來完成(一般跨功能小組=FME

9、A小組) Although responsibility for the preparation of the FMEA is usually assigned to an individual, FMEA input should be a team effort. 即使產(chǎn)品/製程是一致的，不同小組的比較及評價是不適宜的。 It is not appropriate to compare the ratings of one teams FMEA with the ratings of another teams FMEA, even if the product/process appea

10、rs to be identical, since each teams environment is unique and thus the respective individual ratings will be unique. FMEA文件的審查建議應(yīng)對應(yīng)於公司品質(zhì)目標(biāo)，且包含予公司管理審查會議中。 A review of the FMEA document against FMEA quality objectives is recommended, including a management review.,FMEA的實施(FMEA Implementation),FMEA的持續(xù)

11、追蹤是非常重要的 The need for taking effective preventive/corrective actions, with appropriate follow-up on those actions, cannot be overemphasized. 負責(zé)工程師應(yīng)確保所有的建議措施均已有效執(zhí)行 The responsible engineer is in charge of ensuring that all recommended actions have been implementation or adequately addressed. FMEA是個隨時

12、需要更新的文件,縱使該產(chǎn)品已經(jīng)量產(chǎn),如有設(shè)計或工程變更時亦需更新FMEA內(nèi)容 The FMEA is a living document and should always reflect the latest level, as well as the latest relevant actions, including those occurring after the start of production.,FMEA的持續(xù)追蹤(Follow-Up),Design Failure Mode and Effects Analysis 設(shè)計失效模式與效應(yīng)分析,DFMEA簡介(Introduc

13、tion),設(shè)計FMEA主要是由負責(zé)設(shè)計的工程師/小組採用的一種分析技術(shù)，用來佐證在可能的範(fàn)圍內(nèi)已充分地考慮到，並指明各種潛在的失效模式及其相關(guān)的起因/機制。 A Design Potential FMEA is an analytical technique used primarily by a Design-Responsible Engineer/Team as a means to ensure that, to the extent possible, potential failure modes and their associated causes/mechanisms ha

14、ve been considered and addressed. 最終成品及所有相關(guān)的系統(tǒng)，子系統(tǒng)及零組件都應(yīng)納入評估。 End items, along with every related system, subsystem, and component, should be evaluated.,FMEA是設(shè)計小組想法的摘錄(包括依據(jù)經(jīng)驗有可能失效事項之分析)。 In its most rigorous form, an FMEA is a summary of the teams thoughts (including an analysis of items that could

15、go wrong based on experience) as a component, subsystem, or system is designed. 根據(jù)潛在失效模式對顧客的影響程度，列出優(yōu)先順序來，並據(jù)以建立設(shè)計、改善、開發(fā)及驗收測試或分析之優(yōu)先順序系統(tǒng)。 Developing a ranked list of potential failure modes according to their effect on the “customer”, thus establishing a priority system for design improvements, develop

16、ment, and validation testing/analysis.,DFMEA簡介(Introduction),顧客的定義(Customer Defined),設(shè)計FMEA中“顧客”的定義，不僅僅是指“最終使用者” ，還包括負責(zé)車型設(shè)計或更高一級裝配過程設(shè)計的工程師/小組，以及在生產(chǎn)過程中負責(zé)製造、裝配和售後服務(wù)的工程師。 The definition of “Customer” for a Design FMEA is not only the “End User” but also the design-responsible engineers/teams of the veh

17、icle or higher-level assemblies, and/or the manufacturing/process-responsible engineers in activities such as manufacturing, assembly, and service.,小組的努力(Team Effort),在最初的設(shè)計FMEA過程中，負責(zé)設(shè)計的工程師被要求能夠直接地、主動地從所有受到影響的領(lǐng)域，這些領(lǐng)域應(yīng)該包括，但不限於：裝配、製造、設(shè)計、分析/測試、可靠度、材料、品質(zhì)、服務(wù)和供應(yīng)商，以及負責(zé)次一上層或下層組裝、系統(tǒng)、子系統(tǒng)或零組件。 During the initi

18、al Design FMEA process, the responsible engineer is expected to directly and actively involve representatives from all affected areas. These areas of expertise and responsibility should include but are not limited to assembly, manufacturing, design, analysis/test, reliability, materials, quality, se

19、rvice, and suppliers, as well as the design area responsible for the next higher or lower assembly or system, subsystem, or component.,設(shè)計FMEA是一份動態(tài)文件，且應(yīng)該： The Design FMEA is a living document and should: 在一個設(shè)計概念最終形成之時或之前開始； Be initiated before or at design concept finalization 在產(chǎn)品開發(fā)各階段中，當(dāng)設(shè)計有變更或獲得資訊增加

20、時，要及時、不斷地修改； Be continually updated as changes occur or additional information is obtained throughout the phases of product development 在最終產(chǎn)品加工圖樣完成至製迼模具之前全部結(jié)束。 Be fundamentally completed before the production drawing are released for tooling.,小組的努力(Team Effort),設(shè)計FMEA不是靠過程控制來克服設(shè)計中潛在的缺陷，但的確要考慮製造/裝配過程

21、中技術(shù)的/物質(zhì)的限制。例如： The Design FMEA does not rely on process controls to overcome potential design weaknesses, but it does take the technical/physical limits of a manufacturing/assembly process into consideration, for example: 必要的拔模斜度 (Necessary mold drafts) 表面處理的限制 (Limited surface finish) 裝配空間/工具可加工性 (

22、Assembling space/access for tooling) 鋼材硬度的限制 (Limited hardenability of steels) 公差/過程能力/性能 (Tolerance/process capability/performance),小組的努力(Team Effort),設(shè)計FMEA也可以考慮到產(chǎn)品維護(售後服務(wù))和資源回收利用技術(shù)的/物質(zhì)的限制。例如： The Design FMEA can also take into consideration the technical/physical limits of product maintenance(ser

23、vice) and recycling, for example: 工具加工 (Tool access) 診斷 (Diagnostic capability) 材料分類標(biāo)示(資源回收利用) (Material classification symbols(for recycling),小組的努力(Team Effort),DFMEA的開發(fā)(Development),負責(zé)設(shè)計的工程師擁有許多用於設(shè)計FMEA準(zhǔn)備工作的文件。 The design-responsible engineer has at his or her disposal a number of documents that w

24、ill be useful in preparing the Design FMEA. 設(shè)計FMEA的開始將從列出設(shè)計希望做什麼？及不希望做什麼？即設(shè)計意圖. The process begins by developing a listing of what the design is expected to do and what it is expected not to do, i.e., the design intent.,可能是透過品質(zhì)機能展開(QFD)、車輛要求文件、已知的產(chǎn)品要求和/或製造/裝配/服務(wù)/回收利用要求等來源，應(yīng)該綜合地確定顧客要求和需求。 Customer wa

25、nts and needs as may be determined from sources such as Quality Function Deployment(QFD), Vehicle Requirements Document, known product requirements, and/or manufacturing /assembly/service/recycling requirements should be incorporated. 期望特性的定義越明確，就越容易識別潛在的失效模式，以採取預(yù)防/矯正措施。 The better the definition of

26、 desired characteristics, the easier it is to identify potential failure modes for preventive/corrective action.,DFMEA的開發(fā)(Development),設(shè)計FMEA填寫說明,1. FMEA編號： 填入FMEA文件編號,以便追蹤查詢。 FMEA Number: Enter the FMEA document number, which may be used for tracking. 2. 系統(tǒng)、子系統(tǒng)及零組件：註明合適的分析等級,並填入系統(tǒng)、子系統(tǒng)或零件名稱和編號。 Syst

27、em, Subsystem, or Component Name and Number: Indicate the appropriate level of analysis and enter the name and number of the system, subsystem, or component being analyzed. FMEA小組必須決定那些是系統(tǒng)、子系統(tǒng)或零組件，基本上，這三者的區(qū)分是相當(dāng)主觀的。 The FMEA team members must decide on what constitutes a system, subsystem, or compone

28、nt for their specific activities. The actual boundaries that divide a system, subsystem, and component are arbitrary and must be set by the FMEA team.,系統(tǒng)FMEA的範(fàn)圍 (System FMEA Scope): 一個系統(tǒng)可由多個不同的子系統(tǒng)所構(gòu)成，子系統(tǒng)可由不同的小組所設(shè)計，典型的系統(tǒng)FMEA可包含下列系統(tǒng):底盤系統(tǒng)、動力系統(tǒng)或內(nèi)裝系統(tǒng)等。 A system can be considered to be made of various sub

29、system. These subsystem often have been designed by different teams. Some typical System FMEAs might cover the following systems: Chassis System, or Power train System, or Interior System, etc. 因此系統(tǒng)FMEA是用以確保所有構(gòu)成系統(tǒng)的不同子系統(tǒng)的所有介面，及相互作用以及其他車用系統(tǒng)皆被含蓋在內(nèi)。 Thus, the focus of the System FMEA is to ensure that a

30、ll interfaces and interactions are covered among the various components that make up the subsystem.,設(shè)計FMEA填寫說明,子系統(tǒng)FMEA的範(fàn)圍 (Subsystem FMEA Scope): 一般而言，子系統(tǒng)是由較大系統(tǒng)之次一組系統(tǒng)所構(gòu)成。 A Subsystem FMEA is generally a sub-set of a large system. 例如：前懸吊子系統(tǒng)是底盤系統(tǒng)的下一層系統(tǒng)。 For example, the front suspension subsystem is a

31、 sub-set of the chassis system. 因此子系統(tǒng)FMEA之重點在於確保構(gòu)成子系統(tǒng)的不同零組件的所有介面及相互作用皆能含蓋在內(nèi)。 Thus, the focus of the Subsystem FMEA is to ensure that all interfaces and interactions are covered among the various components that make up the subsystem.,設(shè)計FMEA填寫說明,零組件FMEA的範(fàn)圍(Component FMEA Scope): 一般而言，零組件FMEA是著眼於子系統(tǒng)之次

32、一層結(jié)構(gòu). A Component FMEA is a generally an FMEA focused on the sub-set of a subsystem. 例如，支柱為前懸吊系統(tǒng)的一個零組件。 For example, a strut is a component of the front suspension(which is a subsystem of the chassis system.),設(shè)計FMEA填寫說明,設(shè)計責(zé)任：填入OEM、部門和小組，可能的話還應(yīng)包含供應(yīng)商名稱。 Design Responsibility: Enter the OEM, department

33、, and group. Also include the supplier name, if applicable. 準(zhǔn)備者：填入負責(zé)FMEA準(zhǔn)備工作的工程師的姓名、電話號碼和公司的名稱。 Prepared By: Enter the name, telephone number, and company of the engineer responsible for preparing the FMEA.,設(shè)計FMEA填寫說明,車型/年份/車型類別：填入將使用或/和即將被分析的車型年份及車輛類別(假如知道)。 Model Year(s)/Program(s): Enter the inte

34、nded model year(s)/program(s) that will use and/or be affected by the design being analyzed(if known). 關(guān)鍵日期：填入FMEA初次預(yù)定完成日期,該日期不能超過計劃生產(chǎn)的發(fā)佈日期。 Key Date: Enter the initial FMEA due date, which should not exceed the scheduled production design release date. FMEA日期：填入編制FMEA原始稿的日期,和最新被修訂的日期。 FMEA Date: En

35、ter the date the original FMEA was complied and the latest revision date.,設(shè)計FMEA填寫說明,設(shè)計FMEA填寫說明,8.核心小組(Core Team): 列出被授權(quán)參與或執(zhí)行這項工作的負責(zé)個人和單位。(建議將所有小組成員名字、單位、電話號碼、地址等資料都紀(jì)錄在分發(fā)表上) List the names of the responsible individuals and departments that have the authority to identify and/or perform tasks. (It is

36、 recommended that each team members name, department, telephone number, address, etc., be included on a distribution list.),設(shè)計FMEA填寫說明,9. 項目/功能 (Item/Function): 填入正被分析的名稱和其他相關(guān)資料(如編號、零件等級)。利用工程圖面上標(biāo)明的名稱並顯示的設(shè)計等級。於最初發(fā)行之前,應(yīng)使用臨時性編號。 Enter the name and other pertinent information (e.g., the number, the par

37、t class, etc.) of the item being analyzed. Use the nomenclature and show the design level as indicated on the engineering drawing. Prior to initial release (e.g., in the conceptual phases), experimental numbers should be used.,盡可能簡潔地填入被分析項目的功能使之符合設(shè)計意圖。包括這個系統(tǒng)作業(yè)相關(guān)環(huán)境的資訊(如：溫度、壓力、溼度範(fàn)圍、設(shè)計壽命)。如果項目包含一個以上有不同

38、潛在失效模式功能時，則必須列出所有個別功能. Enter, as concisely as possible, the function of the item being analyzed to meet the design intent. Include information (metrics/measurables) regarding the environment in which this system operates (e.g., define temperature, pressure, humidity ranges, design life). If the item

39、 has more than one function with different potential modes of failure, list all the functions separately.,設(shè)計FMEA填寫說明,10. 潛在失效模式 (Potential Failure Mode): 所謂潛在失效模式是指零件、子系統(tǒng)或系統(tǒng)有可能未達到設(shè)計意圖的形式。潛在失效模式也可能是較高階子系統(tǒng)或系統(tǒng)失效原因，或較低階零組件的失效效應(yīng)。 Potential failure mode is defined as the manner in which a component, subsy

40、stem, or system could potentially fail to meet or deliver the intended function described in the item/function column (I.e., intended function fails). The potential failure mode may also be the cause of a potential failure mode in higher-level subsystem or system, or be the effect of one in a lower-

41、level component.,設(shè)計FMEA填寫說明,設(shè)計FMEA填寫說明,對一個特定項目及其功能，列出每一個潛在失效模式。大前題是這種失效可能發(fā)生的，但不是一定會發(fā)生的。建議將以往TGW(錯誤的案例)的研究，問題報告以及小組的“腦力激盪”的檢討作為出發(fā)點。潛在失效模式可能發(fā)生於某些作業(yè)條件下(如：熱、冷、乾、多灰塵的條件)和在某些使用條件下(如：超過平均里程數(shù)以上、粗糙不平的地形、僅在市區(qū)行駛)。 List each potential failure mode associated with the particular item and item function. The assum

42、ption is made that the failure could occur but may not necessarily occur. A recommended starting point is a review of past things-gone-wrong, concerns, reports, and group brainstorming. Potential failure modes that could occur only under certain operating conditions (i.e., hot, cold, dry, dusty, etc

43、.) and under certain usage conditions (i.e., above-average mileage, rough terrain, city driving only, etc.) should be considered.,典型的失效模式包含下列各項，但不限於此：破碎的、變形、鬆弛、洩漏、黏著、短路、生鏽、氧化、龜裂。未傳送扭力，打滑(未保持全扭力)不能支撐(結(jié)構(gòu)上的)，不適當(dāng)?shù)闹?結(jié)構(gòu)上的)，切入不順，拖勾過快，不足信號，信號間歇中斷，沒有信號，電磁相容性/射頻干擾,偏移。 Typical failure modes could be but are n

44、ot limited to: Cracked, Deformed, Loosened, Leaking, Sticking, Oxidized, Fractured, Does not transmit, Slips(does not hold full torque), No support(structural), Inadequate support(structural), Harsh engagement, Disengages too fast, Inadequate signal, intermittent, No signal, EMC/RFI, Drift. 註：潛在失效模式

45、應(yīng)以物理性或技術(shù)用語來描述，而非以顧客所看的現(xiàn)象來描述。 Note: Potential failure modes should be described in “physical” or technical terms, not as a symptom necessarily noticeable by the customer.,設(shè)計FMEA填寫說明,設(shè)計FMEA填寫說明,11. 潛在失效效應(yīng) (Potential Effect(s) of Failure): 潛在失效效應(yīng)定義為失效模式對系統(tǒng)功能的影響。也就是，失效模式一旦發(fā)生時，對系統(tǒng)或設(shè)備以及操作使用的人員所造成的影響。一般在討論

46、失效效應(yīng)時要清楚說明該功能是否會影響到安全性及法規(guī)的符合性並檢討失效發(fā)生時對於局部所產(chǎn)生的影響,然後循產(chǎn)品的組合架構(gòu)層次，逐層分析一直到最高層級人員、裝備所可能造成的影響。 Potential effects of failure are defined as the effects of the failure mode on the function, as perceived by the customer. Describe the effects of the failure in terms of what the customer might notice or experien

47、ce, remembering that the customer may be an internal customer as well as the ultimate end user. State clearly if the failure mode could impact safety or noncompliance to regulations. The effects should always be stated in terms of the specific system, subsystem, or component being analyzed. Remember

48、 that a hierarchical relationship exists between the component, subsystem, and system levels.,例如：一個零件的斷裂可能引起總成的震動，進而導(dǎo)致系統(tǒng)運行的中斷，這種狀況會引起性能的下降,可能造成於組合過程的震動，最終導(dǎo)致客戶的不滿。 For example, a part could fracture, which may cause the assembly to vibrate, resulting in an intermittent system operation. The intermitt

49、ent system operation could cause performance to degrade and ultimately lead to customer dissatisfaction. 典型的失效效應(yīng)包括：噪音、粗糙、操作不規(guī)則、無法操作、異味、不穩(wěn)定、操作不良、間歇性操作、熱現(xiàn)象、滲漏、校準(zhǔn)不符。 Typical failure effects could be but are not limited to: Noise, Rough, Erratic, Operation, Inoperative, Poor Appearance, Unpleasant Odor,

50、 Unstable, Operation Impaired, Intermittent Operation, Thermal Event, Leaks, Regulatory Non-Compliance.,設(shè)計FMEA填寫說明,12. 嚴(yán)重度 (Severity): 嚴(yán)重度是針對失效模式衍生的嚴(yán)重影響所作的等級界定乃一相對的等級評價。 Severity is the rank associated with the most serious effect for a given failure mode. 只有透過設(shè)計變更，才能降低嚴(yán)重度的等級。 A reduction in the sev

51、erity ranking index can be effected only through a design change.,設(shè)計FMEA填寫說明,建議評估標(biāo)準(zhǔn) (Suggested Evaluation Criteria): 小組成員應(yīng)對評估標(biāo)準(zhǔn)及等級系統(tǒng)有一致的共識，即使是個別產(chǎn)品分析有所修訂，亦應(yīng)有一致的共識。 The team should agree on an evaluation criteria and ranking system that is consistent, even if modified for individual product analysis.

52、註：1. 對評估標(biāo)準(zhǔn)9分及10分者，建議不修訂其衡量標(biāo)準(zhǔn)，對評估標(biāo)準(zhǔn)1分，一般不作進一步分析。 Note: 1. It is not recommended to modify criteria ranking values of 9 and 10. Failure modes with a rank of severity 1 should not be analyzed further. 2. 高嚴(yán)重度者，有時可藉由設(shè)計修改來降低失效的嚴(yán)重度，例如平胎行駛可減輕瞬間輪胎爆裂造成的嚴(yán)重度，而安全帶可以減輕車輛撞毀時人員的傷害。 2. High severity ranking can som

53、etimes be reduced by making design revisions that compensate or mitigate the resultant severity of failure. For example, “run flat tires” can mitigate the severity of a vehicle crash.,設(shè)計FMEA填寫說明,建議的DFMEA嚴(yán)重度評估標(biāo)準(zhǔn),Suggested DFMEA Severity Evaluation Criteria,13.等級(Classification),對於需要近一步設(shè)計或製程管制的零組件，子系統(tǒng)

54、或系統(tǒng)，可利用此欄位來區(qū)分特殊的產(chǎn)品特性(關(guān)鍵、主要、重要、重點等). This column may be used to classify any special product characteristics (e.g., critical, key, major, significant) for components, subsystems, or systems that may require additional design or process controls.,設(shè)計FMEA填寫說明,如果小組認(rèn)為對產(chǎn)品有幫助或管理階層有所要求時，本欄位亦可將工程評估高優(yōu)先順序模式者予以註

55、記。 This column may also be used to highlight high-priority failure modes for engineering assessment if the team finds this helpful or if local management requires it. 特殊的產(chǎn)品或製品特性符號及其使用，系由三大汽車公司政策自訂，本手冊並未予以標(biāo)準(zhǔn)化。 Special product or process characteristics symbols and their usage is directed by specific

56、company policy and is not standardized in this document.,設(shè)計FMEA填寫說明,14.潛在失效之原因/機制 典型的失效原因/機制項目如下:,可能包括如下,但不限於可能包括如下,但不限於 錯誤的原物料規(guī)格彎曲 不適當(dāng)設(shè)計壽命假設(shè)金屬疲勞 壓力過大材料不穩(wěn)定 潤滑能力不足潛變 保養(yǎng)說明不適宜磨損 計算不正確腐蝕 軟體規(guī)格不適應(yīng)化學(xué)氧化 表面處理規(guī)格不足/電移(electromigration) 行程規(guī)格不足/材料的摩擦力不適宜 過熱公差計定不適當(dāng),設(shè)計FMEA填寫說明,14.Potential Cause(s)/Mechanism(s) of

57、 Failure,Typical failure causes may include, but are not limited to: Incorrect Material Specified Inadequate Design Life Assumption Over-stressing Insufficient Lubrication Capability Improper Maintenance Instructions Incorrect Algorithm Improper Software Specification Improper Surface Finish Specifi

58、cation Inadequate Travel Specification Improper Friction Material Specified Excessive Heat Improper Tolerance Specified,Design FMEA,Typical failure mechanisms may include, but are not limited to: Yield Fatigue Material Instability Creep Wear Corrosion Chemical Oxidation Electromigration,15.發(fā)生率(Occur

59、rence):,設(shè)計FMEA填寫說明,15.發(fā)生率(續(xù))(Occurrence(continued):,設(shè)計FMEA填寫說明,(c) 與上一版序零件、子系統(tǒng)或系統(tǒng)改變程度的大小? How significant are changes from a previous level component, subsystem, or system? (d) 零件與上一版序零件,有無顯著的差異? Is the component radically different from a previous level component? (e) 零件是否為全新的產(chǎn)品? Is the component completely new? (f) 零件的用途是否改變? Has the component application changed? (g) 作業(yè)環(huán)境是否改變? What are the environmental changes?,15.發(fā)生率(續(xù))(Occurrence(continued):,設(shè)計FMEA填寫說明,(h) 是否運用工程分析去預(yù)估,應(yīng)用此零件之發(fā)生度? Has an engineering analysis (e.g., reli