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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