| 摘要 |
A relatively wide diameter caisson member is placed in the water in a desired off-shore position with the bottom end thereof being forced biased into the sediment by virtue of the weight of the caisson, and with the open opposite end thereof protruding above the surface of the water. A plurality of sonic oscillators are coupled to the portion of the caisson above the surface. These oscillators are each adapted to provide vibrational energy to the casing principally along the longitudinal axis thereof with a minimum component of transverse vibration. The oscillators, each of which is separately driven and capable of delivering only a portion of the power needed to effectively drive the caisson, are driven at a frequency such as to cause resonant elastic vibration of the caisson in a predominantly single longitudinal mode, the separate oscillators tending to adjust both in frequency and phase at this resonant frequency. The caisson is effectively driven into the bottom by virtue of the vibrational energy, the bottom sediment acting on the heavy compression column to damp out unwanted vibrational modes which would otherwise tend to wastefully dissipate sonic energy.
|
