Structural analysis of a strapdown gyro suspension

This project consists of the structural analysis of a universal joint suspension system used to provide a frictionless, torqueless, disturbance free support for the spinning mass of a tuned rotor strapdown gyro. The analysis assumed 10 G accelerations along the x, y and z axes for computation. Compliances to determine isoelasticity conditions, G-capabilities and buckling critical stress were calculated using finite element techniques and classical mechanics. The minimum G-capabilitiy was computed to be 261 G's (32.6 gram rotor) along the z or gyro spin axis. With the force due to the rotor in the +z direction the flexures would fail in buckling, the critical stress being 154,260 psi. Compliances were computed as 46 micro-inches/lb radially and 38 micro-inches/lb axially, an anisoelastic condition. To achieve isoelastic conditions an estimated flexure angle of 57° 15’ would be required.

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