Upload
ravinder-kumar-duvedi
View
220
Download
0
Embed Size (px)
Citation preview
7/29/2019 Productivity Definations
1/19
PRODUCTIVITY DEFINATIONS
AND
MODELS
7/29/2019 Productivity Definations
2/19
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
7/29/2019 Productivity Definations
3/19
PRODUCTIVITY TYPES
Productivity can basically defined in three ways:
Partial Productivity.
Total-Factor Productivity.
Total Productivity.
7/29/2019 Productivity Definations
4/19
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.
7/29/2019 Productivity Definations
5/19
PRODUCTIVITY MODELS
A. SHORT TERM PRODUCTIVITY MODELS
B. LONG TERM PRODUCTIVITY MODELS
7/29/2019 Productivity Definations
6/19
SHORT TERMPRODUCTIVITYMODELS
WEIGHTED PARTIAL PRODUCTIVITY
P.E.T. MODEL
LINEAR TREND MODEL
COMPARATIVE PROD. EVALUATION
MODEL
SEASONAL VARIATION MODEL
7/29/2019 Productivity Definations
7/19
WEIGHTED PARTIAL PRODUCTIVITY
T.P. = W.P. X P.P.
T.P = TOTAL PRODUCTIVITY.
W.P = WEIGHTED PRODUCTIVITY.
P.P = PARTIAL PRODUCTIVITY.
7/29/2019 Productivity Definations
8/19
P.E.T. MODEL
PRODUCTIVITY EVALUATION TREE
Are the actually feasible paths of more generalset of paths.
7/29/2019 Productivity Definations
9/19
LINEAR TREND MODEL
SUPPOSITION: productivity values in past arelinear trend.
cTbaPT .
7/29/2019 Productivity Definations
10/19
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.
7/29/2019 Productivity Definations
11/19
SEASONAL VARIATION MODEL
T.P. = Total Productivity.
a & b = LINEAR TREND constants.
C = Multiplicative seasonal factor.
e = random error.
eCTbaPT )(..
7/29/2019 Productivity Definations
12/19
LONG TERM PROD. MODELS
1. PRODUCTIVITY MAXIMAZATION MODEL.
2. PRODUCTIVITY PROFIT MODEL.
7/29/2019 Productivity Definations
13/19
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
7/29/2019 Productivity Definations
14/19
PRODUCTIVITY PROFIT MODEL
I is treated as a function of output.
After determining max. and min. levels of output
...
I
O
PT
7/29/2019 Productivity Definations
15/19
CASE STUDY
Productivity improvement on EicherAssembly line
Problem: stagnation in production to 50 tractorsper shift leading to reduced margins.
7/29/2019 Productivity Definations
16/19
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
7/29/2019 Productivity Definations
17/19
CASE STUDY
The improvement was undertaken in twostages:
STAGE I : modifying the layout eliminating thehoists with conveys and making new fixtures.
7/29/2019 Productivity Definations
18/19
CASE STUDY
STEP 2:
Integrating the coupling and testing processwith the help of new equipment employing
lesser worker.
7/29/2019 Productivity Definations
19/19
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 .