A laser Doppler velocimetry bench adapted for measuring acoustic particle velocities is used to measure sinusoidal structural velocities in order to assess the performance of two signal processing techniques, one available commercially and the other being developed in our laboratory. Considering a sinusoidal excitation signal of the vibrating structure, both techniques use frequency demodulatio...

The reconfigurable vibrating screen (RVS) machine is an innovative beneficiation machine designed for screening different mineral particles of varying sizes and volumes required by the customers’ through the geometric transformation of its screen structure. The successful RVS machine upkeep requires its continuous, availability, reliability and maintainability. The RVS machine downtime, which c...

This paper explains the design and construction of a phase-sensitive near-field acoustic holography apparatus. By using phase-sensitive lock-in amplifier techniques to record the complex signals of pressure and particle velocity microphones over an extended spatial region, small vibrations can be imaged using the acoustical properties of said vibrations. The apparatus is tested on a vibrating d...

Quantum mechanics of a damped vibrating string investigated by its coupling with an infinit number of Klein-Gordon fields as environment by introducing a minimal coupling method. Heisenberg equation containing a dissipative term proportional to velocity obtained, quantum dynamics for such a dissipative system investigated. Some kinematical relations for a damped vibrating string by eliminating ...

The vibrofluidized bed developed in this work, consisting of a transparent plexiglass tube with an inner diameter of 0.1 m and a height of 0.5 m, was designed for the fluidization of adipic acid. The fluidization behavior of dry adipic acid with particle diameters in the range of 75 600 μm and a density of 1340kg/m was studied using mechanical vibration for different sample loads. Variables stu...

Near-field Acoustic Holography (NAH) has been shown to be a powerful tool for the study of sound radiation from vibrating structures. It provides the reconstruction of acoustic pressure, intensity and particle velocity in the space starting from pressure measurements made on a plane array near the vibrating structure. The reconstruction of the sound field is based on measurement of cross-spectr...

An aerosol generation, calibration, and research facility has been developed with the major purpose of evaluating aerosol instrumentation, including quality assurance testing, intercomparison, performance evaluation, and calibration of aerosol sizing, bulk, and speciated mass-measuring instruments. The aerosol facility also provides excellent opportunities for basic aerosol research. Polydisper...

Soil has elastic-plastic deformation under vibrating working condition. And the acting force between the soil and the vibrating subsoiler parts is of complication. In order to study the effect of the material acting force to the vibrating subsoiler system kinetics features, this paper establishes the vibrating subsoiler system mechanics model considering material acting force. It adopts numeric...