Introducing a novel design in the realm of box type solar cookers: An experimental study

2018 ◽  
Vol 10 (4) ◽  
pp. 043707 ◽  
Author(s):  
Hafiz Abdullah Zafar ◽  
Muhammad Yasin Khan ◽  
Abdul Waheed Badar ◽  
Rasikh Tariq ◽  
Fahad Sarfraz Butt
Keyword(s):  
Experimental Study ◽  
Novel Design

Modeling and Experimental Study of a Biology-Inspired Directional Microphone

2007 ◽  
Author(s):  
Z. Chen ◽  
A. Lacher ◽  
M. Yu
Keyword(s):  
Experimental Study ◽  
Time Delay ◽  
High Accuracy ◽  
Damping Factor ◽  
Arbitrary Direction ◽  
Directional Microphone ◽  
Model Predictions ◽  
Simulation Results ◽  
Stiffness And Damping ◽  
Novel Design

In this paper, a novel design of a biology-inspired directional microphone is presented. This microphone consists of two clamped circular diaphragms, which are mechanically coupled by a connecting bridge that is pivoted at its center. A mechanics based model is constructed to determine the response of the proposed directional microphone to sound incident from an arbitrary direction. The simulation results show that the proposed biology-inspired miniature directional microphone provides a remarkable amplification of the time delay associated with the sound induced diaphragm responses. Different parameters such as coupling bridge stiffness and damping factor are studied to evaluate the performance of the directional microphone. Preliminary experimental results are presented and compared with model predictions. The analyses and results are expected to be helpful for realizing an optimal version of the biology-inspired miniature directional microphone with high accuracy and localization capability for various applications.

Experimental study on the insertion loss of multilayer panels featuring a periodic structure

2021 ◽  
pp. 1351010X2110015
Author(s):  
Preeti Gulia ◽  
Arpan Gupta
Keyword(s):  
Experimental Study ◽  
Insertion Loss ◽  
Sound Propagation ◽  
Structural Vibration ◽  
Destructive Interference ◽  
The Novel ◽  
Sonic Crystal ◽  
Sound Reduction ◽  
Air Cavities ◽  
Novel Design

Acoustic panels with different configurations (layered structure with different absorbing materials) are broadly used to attenuate the noise. Multiple panels are preferred due to the presence of multiple air cavities and the repeated reflections which lead to increased sound attenuation. The paper presents an experimental study of sound propagation through multiple panels. A novel design of acoustic panel is proposed by incorporating the sonic crystal in the air cavities of the panel. Sonic crystal (SC) consists of a periodic arrangement of sound hard scatterers which provide the sound reduction in a particular frequency range due to destructive interference in periodic scatterers. The results are based on experimental observations which are supported by the literature. The results show that increasing the number of panels increases the sound insertion loss from the multiple panel structure. However, the panels with air cavity suffer from the sound insertion loss dip, which makes the panel ineffective. The novel acoustic panel (double and triple panel with SC) provides an additional sound reduction due to SC which can be tailored for certain frequency band. For the present case, SC is designed to overcome the insertion loss dip. The novel panel provides an additional insertion loss, reaching a maximum value of 19 and 11 dB, respectively (for the double and triple panel), overcoming the insertion loss dip due to structural vibration.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

An Experimental Study of Some Properties of Stuttered Words

1962 ◽  
Vol 5 (4) ◽  
pp. 387-394 ◽  
Author(s):  
Bruce Quarrington ◽  
Jerome Conway ◽  
Nathan Siegel
Keyword(s):  
Experimental Study
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