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Aeronautics and Space Analogous to Equations analysis analytical considera application are sum application to impedance approached primarily BASIS FOR MECHANICAL considered as one-dimensional control and simulation D-1544 National Aeronautics dynamic characteristics environmental shock Equations 21 examples of specific expressions for impedance feasibility of mechanical Fourier spectrum harmonic function impedance are given information obtained iNoj investigated theoretically joining terminal marized mathematical expressions mechanical impedance control MECHANICAL IMPEDANCE SIMULATION mechanical structures NASA 18 NASA TECHNICAL NOTE Norton's theorem one-dimensional linear ONE-DIMENSIONAL SYSTEMS OTS price over-all results passive systems phasor primarily from analytical R. O. Belsheim random vibrations shock and vibration simple examples simulation in environmental simulation in mechanical SIMULATION IN SHOCK simulation is approached Space Administration spectral density structures was investigated TECHNICAL NOTE D-1544 test machine testing of mechanical THEORETICAL BASIS theories of application TNSTING OF ONE-DIMENSIONAL transform velocity vibration testing VIBRATION TNSTING