VALUE ANALYSIS AND FUNCTION ANALYSIS SYSTEM TECHNIQUE Stéphane CARO 2014/02/11.

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Presentation transcript:

VALUE ANALYSIS AND FUNCTION ANALYSIS SYSTEM TECHNIQUE Stéphane CARO 2014/02/11

THE CONCEPT OF VALUE The value of a product will be interpreted in different ways by different customers. Its common characteristic is a high level of performance, capability, emotional appeal, style, etc. relative to its cost. This can also be expressed as maximizing the function of a product relative to its cost: Value = (Performance + Capability)/Cost = Function/Cost Value is not a matter of minimizing cost. In some cases the value of a product can be increased by increasing its function (performance or capability) and cost as long as the added function increases more than its added cost. The concept of functional worth can be important. Functional worth is the lowest cost to provide a given function.

“Bête à Cornes” (Horned Beast) flowchart

Function Analysis System Technic (FAST) Goal: The main functions of a design problem are decomposed into technical functions in order to end up with techological solutions

“Octopus” flowchart for the design of a gate opener gate opener

FP1 : to open and close the gate “Octopus” flowchart

FP2 : to be able to close the gate manually in case of energy cut

“Octopus” flowchart FP3 : to tune the gate opening and closing

“Octopus” flowchart FP4 : to be locked

“Octopus” flowchart FP5 : cannot hurt the persons

“Octopus” flowchart FC1 : to mount the gate on the wall

“Octopus” flowchart FC2 : to connect to the electrical network

“Octopus” flowchart FC3 : to be robust with regard to the environment

FP1 : to open and close the gate FP2 : to be able to close the gate manually in case of energy cut FP3 : to tune the gate opening and closing FP4 : to be locked FP5 : cannot hurt the persons FC1 : to mount the gate on the wall FC2 : to connect to the electrical network FC3 : to be robust with regard to the environment Main and Constraint Functions

Lawrence Miles conceived of Value Analysis (VA) in the 1945 based on the application of function analysis to the component parts of a product. Value analysis defines a "basic function" as anything that makes the product work or sell. A function that is defined as "basic" cannot change. Secondary functions, also called "supporting functions", described the manner in which the basic function(s) were implemented. Secondary functions could be modified or eliminated to reduce product cost. As VA progressed to larger and more complex products and systems, emphasis shifted to "upstream" product development activities where VA can be more effectively applied to a product before it reaches the production phase. However, as products have become more complex and sophisticated, the technique needed to be adapted to the "systems" approach that is involved in many products today. As a result, value analysis evolved into the "Function Analysis System Technique" (FAST) INTRODUCTION TO VALUE ANALYSIS

FUNCTION ANALYSIS SYSTEM TECHNIQUE FAST is not an end product or result, but rather a beginning. It describes the item or system under study and causes the team to think through the functions that the item or system performs, forming the basis for a wide variety of subsequent approaches and analysis techniques. FAST contributes significantly to perhaps the most important phase of value engineering: function analysis. FAST is a creative stimulus to explore innovative avenues for performing functions. The importance of the FAST approach is that it graphically displays function dependencies and creates a process to study function links while exploring options to develop improved systems.

CREATING A FAST MODEL The FAST model has a horizontal directional orientation described as the HOW-WHY dimension. This dimension is described in this manner because HOW and WHY questions are asked to structure the logic of the system's functions. Starting with a function, we ask HOW that function is performed to develop a more specific approach. This line of questioning and thinking is read from left to right. To abstract the problem to a higher level, we ask WHY is that function performed. When addressing any function on the FAST model with the question WHY, the function to its left expresses the goal of that function. The question HOW, is answered by the function on the right, and is a method to perform that function being addressed. A systems diagram starts at the beginning of the system and ends with its goal. A FAST model, reading from left to right, starts with the goal, and ends at the beginning of the "system" that will achieve that goal.

CREATING A FAST MODEL

INTEGRATING QUALITY FUNCTION DEPLOYMENT (QFD) WITH FAST A powerful analysis method is created when FAST is used in conjunction with QFD. QFD enables the uses of the Value Analysis Matrix. An example of a value analysis matrix for the pencil example:

INTEGRATING QUALITY FUNCTION DEPLOYMENT (QFD) WITH FAST

EXAMPLES (IN FRENCH)

DESIGN OF AN AUTOMATIC LAWN MOWER

Automatic “Awning” device

Exercise: Window Cleaning Robot for High-rise Buildings 1- Project Description: The project deals with the design of an autonomous window cleaning robot for high-rise buildings. The robot should move freely on the window and clean it efficiently. It should also have a safety system for the user and the robot. 2- Product requirements: the robot should be autonomous the robot can have an external device for water and power supply there should be an external device to prevent the robot from falling down 3- Work to do: Analyze the system in order to well identify the need and formulate the design problem