The Spider Swept Sine vibration testing system provides precise, real-time, multi-channel control using sine waveform. Swept Sine supports up to 512 input channels. Users can enable up to 128 channels for control and notching while designating the remaining as monitoring and time data recording channels. The recording option records time stream data at the full sample rate on all input channels, regardless of the total channel number. A unique hardware design provides a fast loop time of less than 10 ms. Black Box mode allows a user to operate the vibration test controller without a connected computer.
Notching and Limiting
Limiting is applied to control or monitor channels. Three types of limiting are available in Sine Control: frequency domain, time domain, and advanced limit. Two types of limiting are available in Multi-sine control: frequency domain and time domain.
Frequency domain limiting is spectrum limiting. Limit types are notching limit, abort limit, and alarm limit. Time domain limiting compares raw data or the RMS value of input channels to the high limit. The occurrence of exceeding the high limit is one of the system events to which desirable actions can be added. Advanced limit includes summed channel notching and vector notching.
A summed virtual channel is defined as the weighted average of raw time stream signals from multiple input channels. The Notch profile of a summed channel is defined in the frequency domain.
A vector RRS signal is defined as the vector sum of raw time stream signals from three input channels. The notch profile of a vector RRS signal is defined in the frequency domain as well.