Executive Summary:

The presented report comprises of the information of the
torsion tests which were carried out on front axle of an automobile vehicle.  The reference value of the torsion strength required
by the customer is 19.92 Nm. The main objective of the test was to find out if
there were any discrepancies while the calculations were taken, and further if
the axle was strong enough to bear the torsional force. The readings were
noted, calculated in Microsoft Excel and the plotting of graph was done in
Minitab.

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All the
trials were carried out in normal environmental conditions.

Client’s
Name: ABC Beams.

Product
Name: Front Axle.

Calculations:

Reference Value:

19.92 Nm

Test

Observed Value (Nm)

Bias

1

20.7521

0.8321

2

20.8523

0.9323

3

20.7563

0.8363

4

19.9999

0.0799

5

20.9214

1.0014

6

19.8923

-0.0277

7

20.7991

0.8791

8

19.9976

0.0776

9

20.4664

0.5464

10

19.9812

0.0612

Results:

Mean

20.44186

Average Bias

0.52186

Standard Deviation

0.425399554

Standard Error of the Mean

0.134523151

t statistic =

3.879332276

Lower limit

0.217568633

Upper limit

0.826151367

t critical value

2.262

The Degree of freedom of the data
is 9 (df= Sample size – 1).

The value of t static is 3.879332276.

The value of t critical 2.262.

The graph shows that the given data
lies in Confidence interval.

Conclusion:

The readings of the trials show us
that not all the trials done on the torsion bar were accurate. The chart shows
that some trials have presence of error in them. By extrapolating the data
found after 10 tests, we can say that there is significant bias. The bias can
be corrected if the calculations are carried with more precision.

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