[PDF] Top 20 ULTRASONIC NOISE FROM ULTRASONIC DRILLS

... of ultrasonic drills. Ultrasonic noises emitted by these sources depend on the electric power and the different kind of the acoustic enclosures of ...of ultrasonic noise emitted ... See full document

... In order to test the limits of acquisition of the system, the sampling rate was increased to 80 kHz (maximum allowed due to the trigger holdoff of the acquisition system, 12 μs) and the acquisition time reduced to 1 s. ... See full document

... power ultrasonic systems are used in industrial applications such as welding and ...as noise and component failures, often stem from participation of untuned modes in the driving mode due to ... See full document

... structure. From the result of processing, the echo amplitude from the fiber tissue was extracted from each ...accumulated from 60 frames. The extracted information from the boundary ... See full document

... an ultrasonic pulse propagates inside a material suffers some variations related to the specimen ...derived from a time–frequency analysis [1] of the so-called backscattering noise [2], which ... See full document

... the ultrasonic signal as a consequence of a change in the media (for example, a temperature rise, or a little ...to noise; both aspects were evaluated in this ... See full document

... of ultrasonic waves in the mobile unit is triggered by infrared signal, which is generated and sent by the basic ...acoustic noise the 40 kHz ultrasonic signal is the phase manipulated by M – ...=1m ... See full document

... Transmitter Beamforming: the beamforming technique is based on a directional transmission of ultrasonic signals using an array of transducers. This spatial selectivity is achieved exciting all the elements of the ... See full document

... When AC voltage is applied to the stator the PZ material deforms into what is called a flexural traveling wave. The PZ ring vibrates as each sector expands and contracts continuously. The vibrations are transmitted – ... See full document

... The comparison between the results of the ultrasound measurements and the confined-compression tests showed good matching (probability a — 0-05) with the slopes for the fresh and the [r] ... See full document

... Finally, the possible influence of any other mechanism affecting the ultrasound amplitude evolution in the same way as the wave disturbance produced by the microorganism presence or t[r] ... See full document

... In static tests, the velocity measured by the ultrasonic anemometer in different stationary angles of transducers signal path with respect to wind direction has been calibrated with w[r] ... See full document

... band ultrasonic pulse at point on sample ...moved from point to point along X axis. The ultrasonic irradiation and reception processes are repeated at each point, thereby the A-scans are ... See full document

... an ultrasonic field and any stabilizing mechanisms, all bubbles gradually ...the ultrasonic field, the situation is ...in ultrasonic field.The conclusion is therefore that in the ultrasonic ... See full document

... of ultrasonic velocity and density. The ultrasonic (longitudinal) velocity (c) were measured, within an accuracy of ± ...using ultrasonic interferometer at 1 MHz, and density measurements were ... See full document

... of ultrasonic vocalizations we applied the isolated test basic protocol of Brunelli, Hofer and Shair (2002) with subtle ...cotton from the nest with the smell of the mother, as well as sawdust and some ... See full document

... While ultrasonic images inspections in immersion need the extraction of specimens as they were used in this work, one advantage of the proposed parameters and the use of ultra- sonic i[r] ... See full document

... An alternative transducer design is based on the capacitance or electrostatic principle. This has received much interest recently because of the extended bandwidths that can be obtained. These devices are composed of a ... See full document

... The ultrasonic velocity decreased with the temperature of the ...the ultrasonic velocity measured in five samples with different composition at two different temperatures (4 and 12ºC) has been represented ... See full document

... This paper has three objectives to: (1) develop an ultrasonic focussed probe assisted extraction procedure for the isolation of arsenic species from alga samples; (2) characterise and [r] ... See full document