Study of Forward Elastic Wave Cancellation in Large Diameter Rods Based on Two-Point Strain Measurement
Two-point strain measurement is used to separate the forward wave in the large diameter rod,and a Feedforward-feedback control system is designed to predict and suppress the disturbance from the e-lastic rod to the downstream wave.Since the dispersion effect of force waves in the propagation of large-di-ameter rods cannot be avoided,the use of traditional two-point strain measurement method to separate the upstream forward wave leads to excessive error and cannot achieve the ideal vibration damping effect.Based on the one-dimensional longitudinal wave control equation considering lateral inertial correction,it is measured by a two-point strain gage under the assumption that the first mode of Pochhammer-Chree theory can fully describe the propagation of the wave Among them,the Fourier component of the positive wave at a measurement position can be determined by the corresponding Fourier component or its derivative in the history of the measured force wave,and the influence of geometric dispersion on the measurement data is e-liminated by using the derivative of the circular frequency of the wavenumber relative to the elastic rod,so as to accurately expand the spectral information extraction and accurately predict the downstream disturb-ance,and finally use feedforward control to achieve the ideal damping effect.
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