Purpose. To determine the rigidity effect of changes in mine geophones mounting on frequency response recorded seismoacoustic signals. Methodology. Operational calculus and analysis are used. Findings. The dependences characteristics under coupling conditions with rock studied. A possibility is shown qualitative change signal when changing installation case a geophone; moreover, increase can re...

This investigation deals with the mechanics of movement singular quartz gravel and coarse sand riverbed particles upstream over inlet key three Type A piano weir (PKW) models, which were recorded a high-speed camera. Acoustic Doppler velocimeter was used to obtain bed shear stress. The sediment threshold regime compared previous investigations found be within ranges. Generally, particle deceler...

In this paper, theoretical and experimental results of the forced oscillations in an open precessed cylindrical channel are reported. The part treats problem using a linear inviscid irrotational approximation, where different inertial modes, such as resonance ones, presented. A real-channel flume model was constructed for part, three control parameters were considered: nutation angle, rotation ...

In this paper the turbulence effects are studied for three rotors mounted on same instrumented hub. Two scaled models of industrial turbines and one open-geometry turbine considered. The characteristics obtained from 2D Laser Doppler Velocimeter measurements behaviour is analysed thrust torque measurements. Three intensities a large range tip speed ratios flow velocities results anonymised in o...

Laboratory experiments were carried out to investigate the hydraulic characteristics of full-cycle cosine and rectangular sharp-crested weirs in free flow condition. The head–discharge relationships determined theoretically discharge coefficients correlated with weir geometry for both rigid erodible bed conditions. proposed model showed higher comparison weirs. three-dimensional velocity profil...