The paper presents a comparison of single axis simulation results for various stimuli conditions against measurements for the same stimuli conditions on the machme. The results compare well and further comparison can be demonstrated against previously derived lumped parameter models for the same machine. Sinusoidal and CO-sinusoidal inputs are introduced into a complex 2D model including geometric error components measured directly from the machine by laser interferometer. The simulated circular position error traces could then be directly compared with machine measured error traces obtained from using ball bar plots. Measured Bode plots based on the swept sine measurement technique show how the machine is operating across a broad frequency range and provide further information than a step response. A Signal Analyser injects waveforms into the open position loop axis drive and generates Bode diagrams by comparing inputs with outputs. The measured Bode plots compare well with the same diagrams generated from simulated model and in this way the proposed model is validated.
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