Structural-Acoustic Wave Transmission and Reflection in a Hose-Pipe System

2002 ◽  
Author(s):  
Y. F. Hwang
Keyword(s):  
Transfer Matrix ◽  
Wave Transmission ◽  
Piping System ◽  
Transmission Losses ◽  
Pipe System ◽  
Transmission Coefficients ◽  
Large Pressure ◽  
Transfer Matrix Approach ◽  
Reflection Characteristics ◽  
Transmission And Reflection

An analysis of sound and vibratory transmission and reflection losses in a fluid filled planar piping system which consists of straight pipe segments, flexible hose, elbows and/or U-joints is discussed in this paper. The transfer matrix approach is used for the analysis. The wave propagation constants for various types of waves calculated from the transfer matrix method were verified with an exact elasticity theory. Although calculation of the transmission losses for a hose-pipe system has been widely discussed in the literature, the reflection characteristics of a hose-pipe system, however, have not received proper attention. In this paper, we calculate the reflection, absorption, and transmission coefficients of a piping system simultaneously. The numerical example shows that very large pressure and bending wave transmission losses that occur in a hose-pipe system are not only caused by attenuation and dissipation but also by the reflection from the system.

Transmission and Reflection Characteristics of Perforated Submerged Single and Multiple Artificial Reef Units

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Lokesha ◽  
Sundar Vallam ◽  
Sannasiraj Sannasi Annamalaisamy
Keyword(s):  
Experimental Investigation ◽  
Artificial Reef ◽  
Wave Transmission ◽  
Influential Factor ◽  
Hydrodynamic Performance ◽  
Hydrodynamic Characteristics ◽  
Reef System ◽  
Reflection Characteristics ◽  
Trench Width ◽  
Transmission And Reflection

Abstract Submerged breakwaters formed by natural rocks dissipate the incident wave energy. Continuous quarrying of rocks has resulted in its depletion, leading researchers to look for alternate materials for the formation of such barriers. Thus, the concept of artificial reef units has evolved which has been gaining importance owing to the flexibility in molding to any desired shapes and sizes, workability and also due to the fact that it creates a habitable environment to marine flora and fauna. From the hydrodynamic performance perspective, artificial reef units are proven to be more efficient in reducing wave transmission on the lee side (e.g., Southern Caribbean shore of Dominican Republic and Vaan Island, Tuticorin, India). A comprehensive experimental investigation to examine the effect of trench width on hydrodynamic characteristics of the submerged reef system was carried out. The trench width was varied by incorporating single, double, and multiple perforated submerged trapezoidal artificial reef units. The focus of the present study is mainly on the influence of the number of reef units, relative crest width, and relative trench width of the submerged reef system on its transmission and reflection characteristics. The relative trench width was found to be an influential factor on wave transmission past the structure, and the least wave transmission was achieved for the reef configuration with eight units. The details of the experimental investigation, results and discussion are reported in this paper.

Extended discrete-time transfer matrix approach to modeling and decentralized control of lattice-based structures

2016 ◽  
Vol 23 (10) ◽  
pp. 1256-1272 ◽  
Author(s):  
Nick Cramer ◽  
Sean Shan-Min Swei ◽  
Kenneth C. Cheung ◽  
Mircea Teodorescu
Keyword(s):  
Transfer Matrix ◽  
Decentralized Control ◽  
Discrete Time ◽  
Matrix Approach ◽  
Time Transfer ◽  
Transfer Matrix Approach
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