Module 1.3 – Advanced SRTD

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For Demo Mode only.

Use the Hardware, Inputs, and System Limits configuration from Module 1.1.

1. Create an Advanced SRTD Test

a. Select New Test > Sine.
b. At the bottom of the Sine Test Settings dialog box, select the Advanced button.
c. Select the Profile tab and enter the following profile:

Line 1

• • • Start Amplitude: 0.01 in pk-pk at 20 Hz
    • End Amplitude: 0.01 in pk-pk at 100 Hz

d. Select the Insert button to add a new line.

Line 2

• • • Start Amplitude: 1 G at 100 Hz
    • End Amplitude: 1 G at 200 Hz

e. Select the Calc button to the right of Line 1. This action will create a smooth transition between steps and will change the end frequency of the first step. Accept the changes.
f. Select Insert.

Line 3

• • • Start Amplitude: 0.0001 in pk-pk at 200 Hz
    • End Amplitude: 0.0001 in pk-pk at 700 Hz

g. Select Calc to the right of Line 2 and accept the changes.

h. Select the Schedule tab and enter the following schedule:

Line 1

• • • Sweep up from 20 Hz for 1 sweep with 100% modifier

i. Select Insert.

Line 2

• • • Select Resonance table from the drop-down list.

j. Select the Channels tab and enter the following configuration:

• • • Set Ch1 as the control channel
    • Select System Limits Apply for Ch1

k. Select the Resonance tab and confirm the Auto-annotate Settings are set to “Select the 3 largest values above 2.”
l. Select the Limits tab and set the Running Drive Limits to:

• • • Max system gain: 6 V/G
    • Max output: 6 V

m. Review the parameters and select OK.
n. Save the test as StudentName_AdvancedSRTD.

2. Create the Graphs

Graph 1 Configuration

• • • Graph Type: Acceleration vs. Freq.
    • Control Loop Traces: Demand, Control, Tolerance, Abort
    • Input Channels: Ch1, Ch2

Graph 2 Configuration

• • • Graph Type: Transmissibility vs. Freq.
    • Reference: Ch1
    • Input Channels: Ch1, Ch2

3. Run the Test

4. Run the Selected Tones

a. After the test is finished, a Select Resonance Frequencies dialog will appear.
b. Dwell at resonance 3 (approximately 497 Hz) for 3 minutes.
c. Select Phase Tracking to the right of the resonance.
d. Select Run Selected Tones.

5. SRTD Controls

a. While the test is running, select View > SRTD Controls.
b. Point to SRTD Controls and select the tau button.

Graphs associated with time will appear. Use the Phase Angle Adjustment Bar to change the phase angle. Observe the effects of the adjustment on the time graphs.

c. Select the theta button.

Graphs associated with the phase will appear. Use the Phase Angle Adjustment Bar to change the phase angle. Observe the effects of this adjustment on the phase graphs.

6. Annotate the Resonance on the Transmissibility Graph

7. Save the Data

Questions

1. What is the G/G ratio of Ch2/Ch1 for the resonance at 497.5 Hz?
2. What benefit does tracked dwell bring to sine resonance testing?
3. What is the phase relationship between Ch2 and Ch1?

Answers in syllabus PDF.