Functional Analysis and Allocation in System Engineering Design

System Engineering Design 1
FUNCTIONAL ANALYSIS AND ALLOCATION
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System Engineering Design 2
Table of Contents
INTRODUCTION...........................................................................................................................................2
OVERVIEW...................................................................................................................................................2
Purpose...................................................................................................................................................2
Inputs.......................................................................................................................................................3
Outputs....................................................................................................................................................3
Staging.....................................................................................................................................................3
Supporting Processes..............................................................................................................................4
FUNCTIONAL ANALYSIS METHODS..............................................................................................................4
Functional Flow Block Diagram................................................................................................................4
Time Representation...........................................................................................................................6
Functional relationship representation...............................................................................................6
Flow Arrows.........................................................................................................................................7
Top-level diagram................................................................................................................................7
Analysis....................................................................................................................................................7
Flow and Function Numbers................................................................................................................7
Output Matrix......................................................................................................................................7
FUNCTIONAL ALLOCATION..........................................................................................................................8
Decompose to Lower-Level Functions.....................................................................................................8
Functional Architecture...........................................................................................................................9
Allocate Performance to All Functional Levels.........................................................................................9
CONCLUSION.............................................................................................................................................10
BIBLIOGRAPHY...........................................................................................................................................11

System Engineering Design 3
INTRODUCTION
This report is about Functional Analysis and Allocation in a systems engineering design through
evaluation of supporting processes, staging, outputs, inputs, purpose, and process of Functional
Analysis and Allocation. Functional Analysis and Allocation also abbreviated as FA&A can be
defined as a process of translating the requirement levels of a system into detailed performance
and functional design criteria. The system engineering design is a recursive, iterative, and
comprehensive problem-solving process used top-down sequentially by the integrated team
(Perry, et al., 2016). This process transforms the requirements and needs into a set of system
process and product descriptions, provides input for the next development level, and produce
information for decision-makers.
The FA&A process includes inputs and outputs, staging the process within the system life-cycle,
and methods or approaches for performing allocation and analysis. The FA&A process bridges
the gap between the constraints and requirements of high-level system set and the detailed
required set to purchase or develop and implement programs (Bijan, et al., 2012). This process is
an integral part of both the design loop and the requirement loop.
OVERVIEW
Purpose
Functional Analysis and Allocation enables for a better understanding of what the engineering
system has to perform, how it is going to be performed, the extent of the performance, the
conflicts and priorities related with the functions at a lower level (Alsaleh & Haron, 2016). The
FA&A provides information significant to the optimization of physical solutions.
Inputs
The FA&A process inputs majorly consist of the project constraints, requirements, objectives,
and needs of the customer. The process inputs may include requirements based on corporate

System Engineering Design 4
knowledge, program decision requirement, output requirements from prior applications of the
system engineering process application, available technology base, environmental, measures of
effectiveness, and missions (Anyaeche & Oluleye, 2011).
Outputs
The output of the FA&A process depends on the development level and will involve the
baseline, the configuration or system item architecture, and decision database, including suitable
specifications of the development phase (Pfannendörfer, 2010). The output is generally any data
that controls or describes the processes or product configurations required for product
development.
Figure 1: Functional Analysis and Allocation
Staging
Functional Analysis and Allocation staged through successively defining lower level
performance and functional requirements hence defining architectures at levels that are ever-
increasing of details. The system requirements are defined and allocated in enough detail to
provide verification and design criteria to support the system design integration.
Supporting Processes
The initial step of the system engineering process is the analyzation of inputs of the process. The
analysis of the requirements is used in the development of performance and functional
requirements. The requirement analysis process is a supporting process that defines and clarify