## Analog techniques for measuring the frequency response of linear physical systems excited by frequency-sweep inputs |

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### Contents

SUMMARY | 1 |

SIMULATED FREQUENCYRESPONSE TESTS | 14 |

CONCLUDING REMARKS | 21 |

2 other sections not shown

### Common terms and phrases

Aero aerodynamic aeroelastic system airfoil airplane amplitude analog computing equipment analysis analyzed appendix application arbitrary averaging circuit averaging device bandwidth constant cosine cycles per second damping determined dynamic effective spectrum level elastic axis electronic analog computer equations of motion Errors due figure 11(b filter lag final value Flight Flutter Testing forcing function Fourier series Fourier transform frequency content frequency range frequency response frequency spectra frequency varies frequency-response function frequency-response measurements frequency-sweep input half-sine harmonic content indicated input frequency interval Laplace operator methods of excitation NACA TN natural frequencies natural modes nondimensional oscillations output parameters Parseval's theorem periodic phase angle pick-up noise plotted in figure polar potentiometer pulse quency ratio Response of Linear sawtooth function semichords shaker force shown in figure sine wave slow sweep static equilibrium steady-state response steady-state sinusoidal sweep data sweep rate testing technique transient response transient-type uniform spectrum vertical translation