Hi all, I have a hydraulic system which I want to control, but I ought to do a frequency response before I set out on that. Can anyone point out how I can manage a frequency response test without buying new hardware? I currently have access to a Matlab toolchain for MPC5xx micros. I want to model the system as a SISO system and the input and outputs are available through the MPC which shall be used for control. I have currently built a Simulink diagram which excites the system with a sinusoid with bias, amplitude, and frequency that can be varied during the test. I can collect the output and then have to identify the time lag and the amplitudes so that I can put them on a frequency chart.
This method is not giving me a good curve. Is there some other method which can yield me a better result, without buying some costly equipment?
Thanks, mc
PS: I might have access to standard electronic equipment.