## Compensation based on linearized analysis for a six-degree-of-freedom motion simulatorThe inertial response characteristics of a synergistic, six-degree-of-freedom motion base are presented in terms of amplitude ratio and phase lag as functions of frequency data for the frequency range of interest (0 to 2 Hz) in real time, digital, flight simulators. The notch filters which smooth the digital-drive signals to continuous drive signals are presented, and appropriate compensation, based on the inertial response data, is suggested. The existence of an inverse transformation that converts actuator extensions into inertial positions makes it possible to gather the response data in the inertial axis system. |

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acceleration limits actual base position amplitude and phase Amplitude ratio appropriate compensation base response channel lead parameters channels for constant-amplitude Circuit diagram compensation parameters constant lag Constant peak velocity constant-amplitude input deg/sec2 degrees of freedom Dieudonne digital-to-analog converters drive program Drive signal position drive signal sine drive signal velocity flight simulation four points frequency range functions of frequency gather the response High velocity in./sec inertial axis system inertial response characteristics inverse transformation lag as functions Langley Research Center LINEARIZED ANALYSIS low-pass filters m/sec Medium velocity MOTION SIMULATOR NASA NASA TN negative peak notch filters Parrish PEAK-VELOCITY CASES High Performing Organization phase data possible to gather prescribed performance limits quency rad/sec range of interest ratio and phase real-time response-generation techniques rotational channels rotational degrees second-order signal sine wave sinusoidal input six-degree-of-freedom motion base steady-state cycle terms of amplitude translational degrees types of response-generation U.S. Customary Units velocity and acceleration