Reciprocating Torsional Excitation
This torsional excitation for a reciprocating machine is entered in this tab.
Note, the data file is in ASCII and free format. The format is:
1. First Line - Description
2. Unit system, 0, 1, 2, 3, or 4. See Unit Systems
3. Second Line - # of speeds (NRPM), # of harmonics (NHAR)
4. Third Line – speed (rpm)
Then followed by the excitation torque
For each harmonics, the torque has the form of Tn = Tcn cos(wnt) + Tsn sin(wnt)
Then repeat the following data for each harmonics
4a. order of harmonics, cos component, sin component
Repeat NHAR times
5. Repeat 4 and 4a for every speed. NRPM times
Example
Ariel Frame JGK/4 Rated rpm 1200, throw 1 data
2 // unit system
3 24 // NRPM, NHAR
1100 // RPM
1 2423 -13467
2 –12867 9207
3 –2973 5670
Other harmonics
24 -1.1 36.3 Total of 24 harmonics
1150
1 2423 -13467
2 –12867 9207
3 –2973 5670
Other harmonics
24 -7.4 31.6
1200
1 2423 -13467
2 –12867 9207
3 –2973 5670
Other harmonics
24 -13.9 25.3
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