Requirements for format of output documents when you output documents while following IPD template to execute activities Format of IPD Output Document must be folowed to ensure that the format of documents are consitent and standardized
模板:分解分配模板
Template Partitioning and Allocation Template
活动名:
Activity id
文档控制CONTROL SECTION
Version版
Date
日期
Change and reason
修改理
By
责
Project Manager 项目理 ___________ Project项目 _________________
Project Phase Decision Checkpoint
项目阶段决策评审点
__ Concept概念 __ Develop开发 __ Launch发布 __ Interim时
√ Plan计划 __ Qualify验证 __ Life Cycle生命周期
1 写作指导:
系统分解分配明确系统功物理二方面划分子系统单元装配件部件设备明确部分间结构电源信号热性等方面接口分解复杂设计问题分解成较更加容易理问题逐步达成解决方案分解够帮助构建问题序方法达成解决方案时开发系统部分成应该仔细进行分解 便满足目标时佳满足高优先级设计需求
System partitioning identifies the functional and physical divisions of a system in terms of the the subsystems the units the assemblies the parts or devices as well as the interfaces between them in terms of structural power signal thermal etc capabilities Partioning breaks a large complex design problem into smaller more manageable problems thus a solution can be achieved incrementally Partitioning also helps structure the problem which makes it possible to use an orderly method for achieving
a solution as well as developing many subsections of the system at the same time Partitioning should be carefully performed to maximize the highest priority design requirements while meeting other goals
分解分配程基设计需求进行够分解分配系统方面:
Aspects of the system that can be partitioned and allocated are
Ÿ 功
Ÿ functionality
Ÿ 性
Ÿ reliability
Ÿ 性
Ÿ performance
Ÿ 维修维护
Ÿ repair and maintenance
Ÿ 测试性
Ÿ testability
Ÿ 装配
Ÿ assembly
Ÿ 机工程
Ÿ ergonomics
根功做分解分配常选择头脑里定整系统观念方面重例达高性分解系统时候设计团队设法模块间连接数量减少常常低性原较少连接导致需模块模块般缺少灵活性难测试维护常常成更高模块导致物料浪费连接数量装配检查测试增加引起制造成增加方面果模块设计容易制造较高生产量实际减少制造成维护成勤受系统分解决策影响方面模块规模素——模块复杂性常常阻止快速问题隔离诊断修复相反较模块意味更模块失效增加服务成备件成等通分解决策硬件软件般说功分配硬件实现分配软件实现
Functionality is a common choice for partitioning and allocation but it is also important to keep the entire system and the other aspects in mind For example when partitioning a system to achieve high reliability the design team may try to minimize the number of interconnections between modules since these are frequent causes of lower reliability Fewer connections however may result in a need for larger modules which are generally less flexible harder to test and maintain and often more costly A large number of smaller modules may result in increased manufacturing costs as a result of increased material waste number of connections assembly inspection and testing On the other hand if the modules are designed so they are easy to manufacture the higher yields may actually decrease manufacturing costs Also the costs of maintenance and logistics are additional aspects that are highly affected by system partitioning decisions Module size is one factor the complexities of larger modules often hinder quick problem isolation diagnosis and repair In contrast use of many smaller modules may mean more frequent module failures thus increasing service costs spare parts costs etc A common partioning de
cision is hardware vs software Generally several functions can be allocated to either hardware or software
确定备选分解分配方案反复程旦确定备选方案必须备选方案进行评估确保没功遗漏分配子系统功满足成功需求分配富验工程判断需求系统复杂性系统部分目标子系统间相互关系等方面知识扎实掌握助做分配种方法功分析
Identifying alternative partitioning and allocation schemes is an iterative process Alternatives once identified must be evaluated to make sure that no functions have been omitted and that the functions assigned to each subsystem can be handled Successful apportionment of requirements is a result of experienced engineering judgment and solid knowledge of the requirements system complexity objectives for each part of the system and interrelationships between various subsystems One technique to help the allocation process is functional analysis
2 写作容:
21 画系统框图
做功分析(顶方式描述功帮助系统工程师细分层次完整描述系统)图例子相类似方法描述系统功分解越越细层次子功直明确独立务
In functional analysis the functions are described in a topdown fashion that helps the systems engineer describe the system completely at each level of detail The following diagram shows the primary system functions and breaks them down into subfunctions at finer and finer levels of detail until discrete tasks are identified
独立务分配子系统特定单元分配种备选方案代表备选设计方案运权衡(Tradeoff)分析评估选择种方案便进步开发
The discrete tasks are then allocated to specific units that are part of different subsystems There may be several alternatives for this allocation which represent different potential design alternatives Tradeoff analyses will be used to evaluate and select one alternative for further development
22 描述功接口
步文档化系统分解需求分配备选方案(备选概念面框图面应表格组成种备选方案)便权衡分析面表格中系统功分解成子系统模块部件接口执行功功分解基新产品应现产品必时类型分解重复程
The next step is to document the alternatives for system partitioning and requirements allocation in preparation for the tradeoff analyses The system functionality may be broken down into which parts of the functionality are performed in the subsystems modules and components and the interfaces in the following table Partition the functionality based on the existing offering upon which the new offering will be based This can be repeated for other types of partitioning as necessary
分解分配备选方案 1
功
接口
子系统 1
模块 1
单元 1
部件 1
483
部件 2
部件 3
部件 4
单元 2
部件 1
部件 2
部件 3
模块 2
单元 1
部件 1
部件 2
部件 3
单元 2
部件 1
部件 2
部件 3
模块 3
单元 1
部件 1
部件 2
部件 3
单元 2
部件 1
部件 2
部件 3
单元 1
部件 1
部件 2
部件 3
子系统 2
模块 1
单元 1
部件 1
部件 2
484
部件 3
部件 4
单元 2
部件 1
部件 2
部件 3
模块 2
单元 1
部件 1
部件 2
485
部件 3
单元 2
部件 1
部件 2
部件 3
……
PARTITIONING & ALLOCATION ALTERNATIVE 1
Functions
Interfaces
Subsystem 1
Module 1
Unit 1
Component 1
483
Component 2
Component 3
Component 4
Unit 2
Component 1
Component 2
Component 3
Module 2
Unit 1
Component 1
Component 2
Component 3
Unit 2
Component 1
Component 2
Component 3
Module 3
Unit 1
Component 1
Component 2
Component 3
Unit 2
Component 1
Component 2
Component 3
Unit 1
Component 1
Component 2
Component 3
Subsystem 2
Module 1
Unit 1
Component 1
Component 2
484
Component 3
Component 4
Unit 2
Component 1
Component 2
Component 3
Module 2
Unit 1
Component 1
Component 2
485
Component 3
Unit 2
Component 1
Component 2
Component 3
Etc
参考资料清单:
请罗列文档参考关参考文献相关文档格式:
作者+书名(杂志文献文档)+出版社(期号卷号公司文档编号)+出版日期+起止页码
例:
[1] D B Leeson A Simple Model of Feedback Oscillator Noise Spectrum Proc IEEE pp329330 February 1966 (英文文章格式)
[2] D Wolaver PhaseLocked Loop Circuit Design Prentice Hall New Jersey1991 (英文书籍格式)
[3] 王阳元奚雪梅等薄膜SOICMOS SPICE电路模拟电子学报vol22No51994 (中文文章格式)
[4] 郑筠MOS存储系统技术科学出版社1990 (中文书籍格式)
[5] XXXSDXXX户手册 V11基础部文档室2001426
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