Down the hole unbalance vibration exciter for seismic treatment of bottom hole zone
The down the hole unbalance vibration exciter with the pneumatic drive is designed to treat face zone in the seismic frequency range. The modular type source consists of a vibration generator with the automated stepped static moment variation, a hold down unit and an in built pneumatic percussive device to advance the facility in uncased holes. The article gives pilot test data on R&D model of the vibration exciter, and amplitude frequency characteristic and spectral content of the excited signal.
Journal of Mining Science