The Experts below are selected from a list of 99 Experts worldwide ranked by ideXlab platform
Keith Crews - One of the best experts on this subject based on the ideXlab platform.
-
Reducing the effect of Wave dispersion in a timber pole based on transversely isotropic material modelling
Construction and Building Materials, 2016Co-Authors: Mahbube Subhani, Jianchun Li, Bijan Samali, Keith CrewsAbstract:Round timbers are used for telecommunication and power distribution networks, jetties, piles, short span bridges etc. To assess the condition of these cylindrical shape timber structures, bulk and Elementary Wave theory are usually used. Even though guided Wave can represents the actual Wave behaviour, a great deal complexity exists to model stress Wave propagation within an orthotropic media, such as timber. In this paper, timber is modelled as transversely isotropic material without compromising the accuracy to a great extent. Dispersion curves and mode shapes are used to propose an experimental set up in terms of the input frequency and bandwidth of the signal, the orientation of the sensor and the distance between the sensors in order to reduce the effect of the dispersion in the output signal. Some example based on the simulated signal is also discussed to evaluate the proposed experimental set up.
Raja T Sekhar - One of the best experts on this subject based on the ideXlab platform.
-
Elementary Wave interactions in blood flow through artery
Journal of Mathematical Physics, 2017Co-Authors: Raja T SekharAbstract:In this paper, we consider the Riemann problem and interaction of Elementary Waves for the quasilinear hyperbolic system of conservation laws that arises in blood flow through arteries. We study the properties of solution involving shocks and rarefaction Waves and establish the existence and uniqueness conditions. We show that the Riemann problem is solvable for arbitrary initial data under certain condition and construct the condition for no-feasible solution. Finally, we present numerical examples with different initial data and discuss all possible interactions of Elementary Waves.
-
riemann problem and Elementary Wave interactions in isentropic magnetogasdynamics
Nonlinear Analysis-real World Applications, 2010Co-Authors: Raja T Sekhar, V D SharmaAbstract:In this paper, we consider the Riemann problem for a quasilinear hyperbolic system of equations governing the one dimensional unsteady simple Wave flow of an isentropic, inviscid and perfectly conducting compressible fluid, subjected to a transverse magnetic field. This class of equations includes, as a special case, the equations of isentropic gasdynamics. We study the shock and rarefaction Waves and their properties, and discuss the geometry of shock curves using the Riemann invariant coordinates. Under certain conditions, we show the existence and uniqueness of the solution to the Riemann problem for arbitrary initial data, and then discuss the vacuum state in isentropic magnetogasdynamics. Finally, we discuss numerical results for different initial data, and discuss all possible interactions of Elementary Waves. It is noticed that although the magnetogasdynamic system is more complex than the corresponding gasdynamic system, all the parallel results remain identical. However, unlike the ordinary gasdynamic case, the solution inside rarefaction Waves in magnetogasdynamics cannot be obtained directly and explicitly; indeed, it requires an extra iteration procedure. It is also observed that the presence of a magnetic field makes both the shock and rarefaction stronger compared to what they would have been in the absence of a magnetic field.
V D Sharma - One of the best experts on this subject based on the ideXlab platform.
-
Classification of the Riemann problem for compressible two-dimensional Euler system in non-ideal gas
Nonlinear Analysis-real World Applications, 2018Co-Authors: M. Zafar, V D SharmaAbstract:Abstract This work is devoted to the study of two-dimensional Riemann problem modeled by compressible Euler system for the non-ideal gas. The initial constant data are divided in four quadrants in such a way that only one planar Elementary Wave connects two neighboring states. We classify the different combinations of planar Elementary Waves and subsequently discuss one by one using the method of generalized characteristic analysis. Attention is drawn to the changes in Elementary Waves, with regard to their shape, speed and strength, under the influence of the van der Waals parameter b . It has been shown that only sixteen (respectively, fifteen) distinct combinations of planar Elementary Waves exist for isentropic (respectively, non-isentropic) non-ideal gas flows.
-
riemann problem and Elementary Wave interactions in isentropic magnetogasdynamics
Nonlinear Analysis-real World Applications, 2010Co-Authors: Raja T Sekhar, V D SharmaAbstract:In this paper, we consider the Riemann problem for a quasilinear hyperbolic system of equations governing the one dimensional unsteady simple Wave flow of an isentropic, inviscid and perfectly conducting compressible fluid, subjected to a transverse magnetic field. This class of equations includes, as a special case, the equations of isentropic gasdynamics. We study the shock and rarefaction Waves and their properties, and discuss the geometry of shock curves using the Riemann invariant coordinates. Under certain conditions, we show the existence and uniqueness of the solution to the Riemann problem for arbitrary initial data, and then discuss the vacuum state in isentropic magnetogasdynamics. Finally, we discuss numerical results for different initial data, and discuss all possible interactions of Elementary Waves. It is noticed that although the magnetogasdynamic system is more complex than the corresponding gasdynamic system, all the parallel results remain identical. However, unlike the ordinary gasdynamic case, the solution inside rarefaction Waves in magnetogasdynamics cannot be obtained directly and explicitly; indeed, it requires an extra iteration procedure. It is also observed that the presence of a magnetic field makes both the shock and rarefaction stronger compared to what they would have been in the absence of a magnetic field.
Mahbube Subhani - One of the best experts on this subject based on the ideXlab platform.
-
Reducing the effect of Wave dispersion in a timber pole based on transversely isotropic material modelling
Construction and Building Materials, 2016Co-Authors: Mahbube Subhani, Jianchun Li, Bijan Samali, Keith CrewsAbstract:Round timbers are used for telecommunication and power distribution networks, jetties, piles, short span bridges etc. To assess the condition of these cylindrical shape timber structures, bulk and Elementary Wave theory are usually used. Even though guided Wave can represents the actual Wave behaviour, a great deal complexity exists to model stress Wave propagation within an orthotropic media, such as timber. In this paper, timber is modelled as transversely isotropic material without compromising the accuracy to a great extent. Dispersion curves and mode shapes are used to propose an experimental set up in terms of the input frequency and bandwidth of the signal, the orientation of the sensor and the distance between the sensors in order to reduce the effect of the dispersion in the output signal. Some example based on the simulated signal is also discussed to evaluate the proposed experimental set up.
Jianchun Li - One of the best experts on this subject based on the ideXlab platform.
-
Reducing the effect of Wave dispersion in a timber pole based on transversely isotropic material modelling
Construction and Building Materials, 2016Co-Authors: Mahbube Subhani, Jianchun Li, Bijan Samali, Keith CrewsAbstract:Round timbers are used for telecommunication and power distribution networks, jetties, piles, short span bridges etc. To assess the condition of these cylindrical shape timber structures, bulk and Elementary Wave theory are usually used. Even though guided Wave can represents the actual Wave behaviour, a great deal complexity exists to model stress Wave propagation within an orthotropic media, such as timber. In this paper, timber is modelled as transversely isotropic material without compromising the accuracy to a great extent. Dispersion curves and mode shapes are used to propose an experimental set up in terms of the input frequency and bandwidth of the signal, the orientation of the sensor and the distance between the sensors in order to reduce the effect of the dispersion in the output signal. Some example based on the simulated signal is also discussed to evaluate the proposed experimental set up.