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K. Do the Intervectorial Analysis.
NOTE: See Fig. 515 for an example.
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(1)
On polar graph paper (Fig. 505) make a first scale from the origin (center of the graph) to the outer perimeter in mils DA (to include the highest value of UO from the first or second engine run).
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(2)
Make a second scale in g-cm on that polar graph (Fig. 505) to find W1 at 2/3 to 3/4 of the graph.
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(3)
Put imbalance W1 and imbalance W2 on the polar graph.
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(4)
Write vector .W1 from the end of W1 to the end of W2 (Example on Fig. 515).
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(5)
To calculate the results more easily, use only the three highest amplitudes (U2) for the No. 1 bearing (or FFCCV) and the three highest amplitudes (U2) for the TRF from the worksheet (Fig. 511).
NOTE: Do not use a vibration amplitude that is less than 1 mil DA.
____ You can use all data from the worksheet, if you will use a computer program to calculate the results.
(a) Use the letters A thru F as indices for the six points you will use.
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(6) Do the steps that follow with each data point, A-F.
NOTE: An example is on Fig. 515.
____
(a)
Write the imbalance vector U1 from the first engine run worksheet (Fig. 504).
(b)
Write the imbalance vector U2 from second engine run worksheet (Fig. 511).
(c)
Write vector R from the end of vector U1 to the end of vector U2.
(d)
Make a vector .W1', the same as .W1, from the center of the graph.
(e)
Make a vector (R'), the same as R, from the center of the graph.
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(7) S 975-026-C00Calculate the phase lag of each data point as follows:
Phase lag = (Angle of vector .W1') - (Angle of vector R') + 180° (Phase lag = A.W1' - AR' + 180°)
(a) Write the phase lag of each data point on the intervectorial analysis worsksheet Fig. 514 (Table 3).
(8) S 975-027-C00Calculate the sensitivity of each data point as follows:
Sensitivity = .W1' g-cm ----------
R' mils
(a) Write the sensitivity of each data point on Fig. 514 (Table 3).
(9) S 975-098-C00Calculate the length of the vector .W2 from the end of vector W1 as follows (Fig. 515): (a) Make a vector .W2 from the end of vector W1 such that the angle between .W1 and .W2 is the same as the angle between R and U1. (b) Find the length of vector .W2 as follows:
.W2 = .W1 x U1 --
R
1) Make a record of the length of vector .W2 on Figure 514 (Table 2).
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(10)
On a polar graph, make a scale in g-cm from the origin on the graph.
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(11)
Make a plot of the 6 points you already indexed (balancing weights .W2 at their angle) (angle of .W2 + phase lag).
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(12)
Draw the vectors AB, AC, AD...EF that connect all the indexed points.
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(13)
Measure and make a record of the length of those vectors (Fig. 516).
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S 975-103-C00
(14) Calculate the minimum residual vibration as follows:
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