Numerical model of acoustic interactions between class IV flextensional transducers using a modal method

2001 ◽  
Vol 109 (5) ◽  
pp. 2363-2363
Author(s):  
John B. Blottman
Keyword(s):  
Numerical Model ◽  
Class Iv ◽  
Modal Method ◽  
Flextensional Transducers

A numerical train–floating slab track coupling model based on the periodic-Fourier-modal method

2016 ◽  
Vol 232 (1) ◽  
pp. 315-334 ◽  
Author(s):  
Longxiang Ma ◽  
Weining Liu
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Moving Load ◽  
Coupling Model ◽  
Principle Of Superposition ◽  
Fourier Modal Method ◽  
Slab Track ◽  
Model Based ◽  
Coupling System ◽  
Modal Method

A numerical model based on the periodic-Fourier-modal method is proposed for the dynamic analysis of a train-floating slab track coupling system with random track irregularity. In the model, each vehicle of the train is modeled as a multiple-degree-of-freedom vibration system consisting of one car body, two bogies, four wheelsets, and two groups of spring-damper suspension devices. The floating slab track is modeled as a periodic-infinite structure with discrete supports and discontinuous slabs. Linear springs are used to couple the train and the track. In order to establish this numerical model, an efficient periodic approach named periodic-Fourier-modal method for solving the dynamic response of the floating slab track under a harmonic moving load is first developed. Based on this, a strategy is then proposed which can couple the moving train to the track with random irregularity and express the wheel–rail force as a superposition of a series of harmonic loads. With the solved wheel–rail force, the vehicle response can be directly calculated through vehicle dynamics, while track response can be calculated through the principle of superposition and the reuse of the initially proposed periodic-Fourier-modal method. Using this train–floating slab track coupling model, the solution of the dynamic response of the infinite track can be transformed to perform only within a single periodic range, which can save the calculation time significantly. The numerical results of the Beijing subway, based on the proposed model, are discussed in detail, and some important conclusions are drawn.

Frequency fine-tuning in Class IV flextensional transducers

2007 ◽  
Vol 68 (10) ◽  
pp. 1280-1285 ◽  
Author(s):  
K.P.B. Moosad ◽  
P. Krishnakumar ◽  
G. Chandrashekar ◽  
R.M.R. Vishnubhatla
Keyword(s):  
Fine Tuning ◽  
Class Iv ◽  
Flextensional Transducers

scholarly journals Numerical modeling of the interaction between class IV flextensional transducers

1990 ◽  
Vol 88 (S1) ◽  
pp. S137-S137
Author(s):  
J. C. Debus ◽  
A. Lavie ◽  
B. Hamonic ◽  
J. N. Decarpigny
Keyword(s):  
Numerical Modeling ◽  
Class Iv ◽  
Flextensional Transducers

Monolithic class IV type flextensional transducers

2007 ◽  
Vol 20 (3-4) ◽  
pp. 139-144 ◽  
Author(s):  
Anne-Christine Hladky-Hennion ◽  
A. Erman Uzgur ◽  
Robert E. Newnham
Keyword(s):  
Class Iv ◽  
Flextensional Transducers

751 Long-term benefit of a hospital based heart failure programme: downgrading the risk of class IV patients

2003 ◽  
Vol 2 (1) ◽  
pp. 161
Author(s):  
E RYAN ◽  
C OLOUGHLIN ◽  
M LEDWIDGE ◽  
B TRAVERS ◽  
M RYDER ◽  
...  
Keyword(s):  
Heart Failure ◽  
Term Benefit ◽  
Class Iv
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