817 A Simple Method of Measuring Thermophysical Properties by Stepwise Heating : 3rd Report, Theoretical Analysis on the Optimum Condition of Measurement)

2001 ◽  
Vol 2001.38 (0) ◽  
pp. 267-268
Author(s):  
Nobuhiro HIMENO ◽  
Shigeru HINATA
Keyword(s):  
Theoretical Analysis ◽  
Optimum Condition ◽  
Thermophysical Properties ◽  
Simple Method ◽  
Stepwise Heating

scholarly journals A Simple Method of Measuring Thermophysical Properties by Stepwise Heating.

1992 ◽  
Vol 58 (545) ◽  
pp. 187-192 ◽  
Author(s):  
Nobuhiro HIMENO ◽  
Shigeru HINATA ◽  
Michio YANADORI
Keyword(s):  
Thermophysical Properties ◽  
Simple Method ◽  
Stepwise Heating

Holographic Evaluation of Edge Delamination in Bars Bonded to a Rigid Support With Foam-Adhesive

1996 ◽  
Vol 118 (3) ◽  
pp. 330-334 ◽  
Author(s):  
S. Qin ◽  
H. M. Shang ◽  
C. L. Giam ◽  
C. E. Tee
Keyword(s):  
Theoretical Analysis ◽  
Rapid Detection ◽  
Iterative Procedure ◽  
Point Load ◽  
Nonlinear Relationship ◽  
Rigid Support ◽  
Double Exposure ◽  
Simple Method ◽  
Exposure Holography ◽  
Edge Delamination

When a bar having one end bonded to a rigid support with foam-adhesive is loaded, the high peeling stresses at the bonded edge foster edge delamination along the interface of bonding. Upon inspection by double exposure holography, with an incremental point load applied at the free end of the bar between exposures, the indistinct fringe perturbation and the unknown resilience of the foam-adhesive (quantified by its foundation modulus) impede unambiguous evaluation of the condition of adhesion. This paper describes a simple method for rapid detection and assessment of artificially created edge delamination in such bar structures. The theoretical analysis elucidates the suitability of modelling the bar as partially clamped, and having an equivalent slope at its support related to the foundation modulus. Two dimensionless parameters are defined, which have between them a linear relationship for a nondelaminated bonding but a nonlinear relationship for a delaminated one. Finally, a simple iterative procedure is described for estimating the delaminated length without having to predetermine the elasticity of the support.

Switchable acoustic metagrating for three-channel retroreflection and carpet cloaking

2022 ◽  
Author(s):  
Ailing Song ◽  
Chaoyu Sun ◽  
Yanxun Xiang ◽  
Fu-Zhen Xuan
Keyword(s):  
Theoretical Analysis ◽  
Numerical Simulations ◽  
Acoustic Communication ◽  
Simple Structure ◽  
Research Work ◽  
Simple Method ◽  
Acoustic Sensing ◽  
Reflected Wave ◽  
Diffracted Waves ◽  
Potential Applications

Abstract In this paper, we propose a switchable acoustic metagrating composed of periodic grooves for realizing switchable functionalities of three-channel retroreflection and carpet cloaking. The groove parameters are determined by calculating and analyzing the reflectance of different diffracted waves, and only one propagating reflected wave is allowed. Theoretical analysis and numerical simulations are performed to validate the three-channel retroreflection and carpet cloaking performances of the proposed metagrating. Our research work provides a practical and simple method to design acoustic devices with switchable functionalities and simple structure, and has potential applications in practical fields of acoustic sensing and acoustic communication.

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