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Improving the fidelity of hydraulic flight motion simulators

Because they are capable of subjecting massive payloads to the high accelerations that typical HWIL simulation scenarios require, it is commonly accepted in the industry that hydraulically-driven flight motion simulators (FMS) offer advantages over other technologies. However, their small-signal performance does not traditionally match that of their electromechanical counterparts. This paper presents design improvements in the direct-drive hydraulic servo that improve accuracy and extend bandwidth, thereby closing the performance gap with electromechanical servos. The paper reports system performance improvements predicted by comprehensive mathematical simulation. These new design concepts are being applied to a 3-axis motion simulator test bed model, whose testing will be reported in a follow-up report.