Energy flow model considering near field energy for predictions of acoustic energy in low damping medium

2011 ◽  
Vol 330 (2) ◽  
pp. 271-286 ◽  
Author(s):  
Jong-Do Kim ◽  
Suk-Yoon Hong ◽  
Hyun-Wung Kwon ◽  
Jee-Hun Song
Keyword(s):  
Energy Flow ◽  
Flow Model ◽  
Near Field ◽  
Acoustic Energy ◽  
Field Energy

Visualizing near-field energy flow and radiation

2000 ◽  
Vol 42 (6) ◽  
pp. 46-54 ◽  
Author(s):  
E.K. Miller ◽  
F.J. Deadrick
Keyword(s):  
Energy Flow ◽  
Near Field ◽  
Field Energy

scholarly journals Near‐Field Energy Transfer between a Luminescent 2D Material and Color Centers in Diamond

2019 ◽  
Vol 3 (2) ◽  
pp. 1900088 ◽  
Author(s):  
Richard Nelz ◽  
Mariusz Radtke ◽  
Abdallah Slablab ◽  
Zai‐Quan Xu ◽  
Mehran Kianinia ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Near Field ◽  
Color Centers ◽  
Field Energy ◽  
2D Material

Simulating Ultrasound Piezoelectric Power Transfer in the Near Field and Experimental Validations

2021 ◽  
Vol 05 ◽  
Author(s):  
Ammar Mohammed ◽  
Changki Mo ◽  
John Miller ◽  
David Lowry ◽  
Jassim Alhamid
Keyword(s):  
Energy Transfer ◽  
Lead Zirconate Titanate ◽  
Near Field ◽  
Acoustic Power ◽  
Acoustic Energy ◽  
Transfer Efficiency ◽  
Ultrasonic Power ◽  
Power Transfer ◽  
Piezoelectric Energy ◽  
Power Transfer Efficiency

Background: Acoustic power transfer is a method for wireless energy transfer to implanted medical devices that permits a greater range of separation between transmitter and receiver than is possible with inductive power transfer. In some cases, short-distance ultrasonic power transfer may be employed; consequently, their operation may be complicated by the near-field aspects of piezoelectric acoustic energy transfer. Methods: A piezoelectric energy transfer system consisting of two lead zirconate titanate (PZT) transducers was analyzed in this work using a combination of experimental measurements and computer simulations. Results: Simulations using the COMSOL Software package showed good agreement with a measured output voltage as a function of the distance between and alignment of the transmitter and receiver with water as a medium. We also simulated how operating frequency affects power transfer efficiency at various distances between the transmitter and receiver and found reasonable agreement with experiments. We report model predictions for power transfer efficiency as a function of the thickness and diameter of the transmitter and receiver. Conclusion: The results show that with proper choice of parameters, piezoelectric systems can provide high power transfer efficiency in the near-field region.

scholarly journals A System for Acoustic Field Measurement Employing Cartesian Robot

2016 ◽  
Vol 23 (3) ◽  
pp. 333-343 ◽  
Author(s):  
Maciej Szczodrak ◽  
Adam Kurowski ◽  
Józef Kotus ◽  
Andrzej Czyżewski ◽  
Bożena Kostek
Keyword(s):  
Acoustic Field ◽  
Energy Flow ◽  
Velocity Vector ◽  
Sound Pressure ◽  
Sound Field ◽  
Acoustic Energy ◽  
The Other ◽  
Object Shape ◽  
Movement Path ◽  
Optimum Path

AbstractA system setup for measurements of acoustic field, together with the results of 3D visualisations of acoustic energy flow are presented in the paper. Spatial sampling of the field is performed by a Cartesian robot. Automatization of the measurement process is achieved with the use of a specialized control system. The method is based on measuring the sound pressure (scalar) and particle velocity(vector) quantities. The aim of the system is to collect data with a high precision and repeatability. The system is employed for measurements of acoustic energy flow in the proximity of an artificial head in an anechoic chamber. In the measurement setup an algorithm for generation of the probe movement path is included. The algorithm finds the optimum path of the robot movement, taking into account a given 3D object shape present in the measurement space. The results are presented for two cases, first without any obstacle and the other - with an artificial head in the sound field.

scholarly journals Development of an 1D Water and Energy Flow Model for Estimation of Soil Moisture Distribution in Permafrost Region

1999 ◽  
Vol 43 ◽  
pp. 103-108
Author(s):  
Nozomu HIROSE ◽  
Toshio KOIKE ◽  
Hiroshi ISHIDAIRA ◽  
Takeo TADONO ◽  
Wang Shaoling ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Energy Flow ◽  
Flow Model ◽  
Moisture Distribution ◽  
Permafrost Region ◽  
Soil Moisture Distribution

The mechanical basis of Drosophila audition

2002 ◽  
Vol 205 (9) ◽  
pp. 1199-1208 ◽  
Author(s):  
Martin C. Göpfert ◽  
Daniel Robert
Keyword(s):  
Mechanical Response ◽  
Dynamic Range ◽  
Near Field ◽  
Sense Organ ◽  
Field Measurements ◽  
Longitudinal Axis ◽  
Acoustic Energy ◽  
Linear Effect ◽  
Response Characteristics ◽  
Non Linear

SUMMARY In Drosophila melanogaster, antennal hearing organs mediate the detection of conspecific songs. Combining laser Doppler vibrometry, acoustic near-field measurements and anatomical analysis, we have investigated the first steps in Drosophila audition, i.e. the conversion of acoustic energy into mechanical vibrations and the subsequent transmission of vibrations to the auditory receptors in the base of the antenna. Examination of the mechanical responses of the antennal structures established that the distal antennal parts (the funiculus and the arista) together constitute a mechanical entity, the sound receiver. Unconventionally, this receiver is asymmetric, resulting in an unusual, rotatory pattern of vibration; in the presence of sound, the arista and the funiculus together rotate about the longitudinal axis of the latter. According to the mechanical response characteristics, the antennal receiver represents a moderately damped simple harmonic oscillator. The receiver's resonance frequency increases continuously with the stimulus intensity, demonstrating the presence of a non-linear stiffness that may be introduced by the auditory sense organ. This surprising,non-linear effect is relevant for close-range acoustic communication in Drosophila; by improving antennal sensitivity at low song intensities and reducing sensitivity when intensity is high, it brings about dynamic range compression in the fly's auditory system.

Analysis of Pulsations and Vibrations in Fluid-Filled Pipe Systems

1995 ◽  
Author(s):  
Christ A. F. de Jong
Keyword(s):  
Energy Flow ◽  
Vibration Mode ◽  
Pipe Wall ◽  
Acoustic Energy ◽  
Mode Shapes ◽  
Strongly Coupled ◽  
Torsional Waves ◽  
Pipe Systems ◽  
Poisson Contraction ◽  
Excessive Noise

Abstract Pressure pulsations and mechanical vibrations in pipe systems may cause excessive noise and may even lead to damage of piping or machinery. In fluid-filled pipe systems pulsations and vibrations will be strongly coupled. A calculation method has been developed for the simulation of coupled pulsations and vibrations in pipe systems. The analytical method is based upon the transfer matrix method. It describes plane pressure waves in the fluid and extensional, bending and torsional waves in the pipe wall. Fluid pulsations and pipe wall vibrations are coupled at discontinuities (e.g. elbows and T-junctions) and via Poisson contraction of the pipe wall. For a given source description, the model calculates levels of vibration, mode shapes, vibro-acoustic energy flow, etc. The method has been validated experimentally on a test rig consisting of two straight pipes and an elbow. The predicted pulsation and vibration levels agree reasonably well with the measurements.

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