Sine Vibration Control
Sine control provides excitation with analogue-quality drive signal and user-programmable sweep parameters. For structural dynamics, it is particularly useful to accurately measure the dynamic response at resonances. Sine control is also ideal for fatigue testing, as all of the excitation energy is concentrated at a single frequency.
Uses
- Swept-sine or stepped-sine testing to meet military standards and other standards
- Structural dynamics characterisation
- Durability and fatigue testing
Features
- True time domain processing with analogue-quality sine source (not FFT based)
- Digital tracking filters with frequency-proportional or fixed bandwidth filters
- Fast 10 ms loop time for accurate control of high Q resonances
- Up to 4 kHz control standard with the option for closed-loop control to 46 kHz
- On-line measurement of FRFs (magnitude & phase) with up to 4096 frequency points
- Pre-test with broadband spectrum to identify system transfer function
A Sine test definition consists of entering a simple breakpoint table, consisting of acceleration, velocity and displacement amplitudes and their associated frequencies, plus slope segments. The software automatically calculates crossover frequencies or AVD amplitudes when slopes are used. As the breakpoint table is constructed, a plot shows the profile.
The maximum peak values for acceleration and velocity and the maximum peak-peak displacement for the test are automatically displayed. If the tests dynamic demands exceed the shaker system’s limits, the software automatically warns the operator.
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| Sine includes user-selectable proportional or constant bandwidth tracking filters along with on-line FRF measurement. |
