Volume 33 Issue 12
Dec.  2018
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Analysis on the force measurement accuracy of the integrated vehicle in the impulse wind tunnel[J]. Journal of Aerospace Power, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.012
Citation: Analysis on the force measurement accuracy of the integrated vehicle in the impulse wind tunnel[J]. Journal of Aerospace Power, 2018, 33(12). doi: 10.13224/j.cnki.jasp.2018.12.012

Analysis on the force measurement accuracy of the integrated vehicle in the impulse wind tunnel

doi: 10.13224/j.cnki.jasp.2018.12.012
  • Received Date: 2017-09-14
  • Publish Date: 2018-12-28
  • To evaluate the force measurement accuracy of the integrated vehicle in the impulse combination wind tunnel, some actions were taken. Firstly, the force-measurement system was simplified and the dynamic equation was built according to its structural characteristics. Then, the impulse response attenuation function was deducted. Secondly, the time-dependent changing rule of the output signal of the force-measurement system was analyzed and the dominant frequency of was acquired through fast Fourier transformation (FFT) method. Next, the neural network algorithm and gradient descent algorithm were used to fit the signal of force balance and to predict the trend value of the force-measurement signal. Finally, the signal fitting and trend prediction of a number of tests data were conducted and the measurement accuracies were acquired. The result prove that this method can truly predict the stable output result, meanwhile, the measurement accuracy can reach over 97% when the output signal of force-measurement system includes 4 cycles.

     

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