APPLICATION OF IMPEDANCE THEORY AND MEASUREMENT TO STRUCTURAL VIBRATION.
Final rept. Jun 66-Aug 67,
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS
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The mechanical impedance theory of vibration transmission is reviewed for deterministic and for random excitation. An approximate formulation for random vibration transmission is developed in terms of average admittances. It is applicable to frequency bands of random vibration like third octave bands. Mechanical admittances driving point and transfer are obtained experimentally for a rod and a beam and compared with calculations from the rod and beam equations with hysteretic damping. Elementary vibration transmission from a rod to a beam, and from a beam to a beam, are studied. Finally, random vibration transmission from a cylindrical shell to a black box is measured and compared with the results obtained from measured mechanical admittances. The agreement is fair. Approximations are emphasized. Author
- Structural Engineering and Building Technology