productivity definations

7/29/2019 Productivity Definations

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PRODUCTIVITY DEFINATIONS

AND

MODELS


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PRODUCTIVITY

Productivity can defined in a number of wayswhich include definitions by OEEC in 1950 toby sumanth in 1979.

Productivity is concerned with efficientutilization of resources (inputs) in producinggoods and /or services (output).

Efficiency is the ratio of actual output attainedto standard output expected


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PRODUCTIVITY TYPES

Productivity can basically defined in three ways:

Partial Productivity.

Total-Factor Productivity.

Total Productivity.


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PRODUCTIVITY

Partial Productivity: Is the ratio of outputto one class of input.

Total-Factor Productivity: Is the ratio of

net output to sum of associated labor

and capital (factor) inputs.

3. Total Productivity: Is the ratio of total

output to the sum of all inputs factors.


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PRODUCTIVITY MODELS

A. SHORT TERM PRODUCTIVITY MODELS

B. LONG TERM PRODUCTIVITY MODELS


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SHORT TERMPRODUCTIVITYMODELS

WEIGHTED PARTIAL PRODUCTIVITY

P.E.T. MODEL

LINEAR TREND MODEL

COMPARATIVE PROD. EVALUATION

MODEL

SEASONAL VARIATION MODEL


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WEIGHTED PARTIAL PRODUCTIVITY

T.P. = W.P. X P.P.

T.P = TOTAL PRODUCTIVITY.

W.P = WEIGHTED PRODUCTIVITY.

P.P = PARTIAL PRODUCTIVITY.


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P.E.T. MODEL

PRODUCTIVITY EVALUATION TREE

Are the actually feasible paths of more generalset of paths.


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LINEAR TREND MODEL

SUPPOSITION: productivity values in past arelinear trend.

cTbaPT .


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COMPARATIVE PROD. EVALUATION MODEL

is a combination of P.E.T. & Linear Trend.

Method consistently giving the minimum

variance between the actual & plannedproductivity values in coming periodsshould be used for future evaluation and

planning.


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SEASONAL VARIATION MODEL

T.P. = Total Productivity.

a & b = LINEAR TREND constants.

C = Multiplicative seasonal factor.

e = random error.

eCTbaPT )(..


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LONG TERM PROD. MODELS

1. PRODUCTIVITY MAXIMAZATION MODEL.

2. PRODUCTIVITY PROFIT MODEL.


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PRODUCTIVITY MAXIMAZATION MODEL

I is assumed to be a function of Quantity.

So, Input function could be:

1. Linear Input :

2. Exponential input :

3. Quadratic input : 4. Cubic input :

...IOPT

.32

QdQcQbaI

.2

QcQbaI

.QbaI

.b

QaI


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PRODUCTIVITY PROFIT MODEL

I is treated as a function of output.

After determining max. and min. levels of output

...

I

O

PT


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CASE STUDY

Productivity improvement on EicherAssembly line

Problem: stagnation in production to 50 tractorsper shift leading to reduced margins.


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CASE STUDY

SOLUTION:

A. Time study of the whole process

$ lead to identification of bottle necks.

The main bottle neck was

flywheel coupling and testing of

transmission


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CASE STUDY

The improvement was undertaken in twostages:

STAGE I : modifying the layout eliminating thehoists with conveys and making new fixtures.


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CASE STUDY

STEP 2:

Integrating the coupling and testing processwith the help of new equipment employing

lesser worker.


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CASE STUDY

RESULTS:

~ LESSER MANPOWER

~ REDUCED CYCLETIME

~MORE PRODUCTION

1. Rotary table for easy of work .

2. Conveyor for transfer primary shaft .

3. Hydraulic Bearing Pressing unit for Intermediate shaft

pressing .

4.Trays for Tools on conveyor .

5.space for Primary shaft & Hub on Housing Fixture .

6. Fixture Return Conveyor .

7.Material Supply trolley movement is reduce .

8. Easy Access for Hardware .

productivity definations

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