2. Test setup
The test process is a multiple input, multiple output
(MIMO) system with two inputs and two outputs
with one clearly distinct natural frequency at
284.73 Hz (see Figure 1). This model is a representation
of a solid steel beam rigidly supported from both ends
by passive mounts. An accelerometer measuring the
disturbance is placed at the bottom of each mount.
The required control forces are produced by two inertial
mass shakers attached on top of each mount. The
inputs of the model are the voltage signals fed to the
mass shakers and the outputs are the measured accelerations.
The given process has proven to be a suitable
test-bed system in earlier studies (Orivuori et al., 2010).
Hence, the process model is found to be a suitable
benchmark for the comparison of different methods
in simulations. The control setup is illustrated in
Figure 2.
The process is described by a general state-space
representation: