Actuator frequency response- supine

This section describes the actuator response using a proportional controller (with xPC), with a gain of 8.

The frequency response of the actuator was identified by using the Dynamic Signal Analyzer to generate random perturbations, and collecting the resulting position signal through the MATLAB Experimental GUI. Input and position signals were collected @ 1000Hz with anti-alias filtering using the Frequency Devices 9064 filters (cut-off 300Hz) for 120s. The feedback and input signals were filtered (cut-off 300 Hz) using the Frequency Devices 902LPF filters before input into the controller.

The plots were generated using the MATLAB spectrum function (nfft = 2^10)

Perturbation properties: Input bandwidth 0.5 - 500 Hz, Amplitude = 1 Vpp

Last modified: 2002-05-25 J Y Tung