| 摘要 |
PURPOSE:To provide measuring apparatus of compact in size and light in weight by changing a trucking filter to a multichannel vector filter thereby simultaneously obtain mechanical impedance at various points. CONSTITUTION:Sine wave from an oscillator 4 enters a vibrator 2 through an amplifier 3 to oscillate a specimen 1. Power gauge 5 measures load exerted on the specimen 1 and accelerometers 6 measure responding acceleration at respective sections of the specimen 1, then the outputs are inputted into a multichannel vector filter 8 through a multichannel amplifier 7 to extract oscillation frequency component and are inputted into a digital calaculator 11 through an A/D converter 9. At the same time, the output from the oscillator 4 is measured by a pulse counter 10 to obtain vibration frequency and is inputted into a digital calculator 11. Then it is recorded by a data recording program 12 together with power and acceleration signals and acceleration A is integrated and converted into speed V by an impedance calculating program 14 thereby mechanical impedance Z is obtained by power F divided by speed V. |
