Fluid-Structure Interaction Analysis of Aircraft Hydraulic Pipe with Complex Constraints Based on Discrete Time Transfer Matrix Method

Fluid-structure interaction (FSI) is prevalent in aircraft hydraulic pipes due to high-pressure fluid pulsation, complex pipe path routing and boundary constraints, which pose a serious threat to the safety and reliability of the aircraft hydraulic system. This paper focuses on the FSI response of aircraft hydraulic pipes with complex constraints. A comprehensive fourteen-equation model for describing the FSI of pipe conveying fluid with wide pressure and Reynolds number range is proposed. The excitation models and complex boundary constraints of liquid-filled pipes are established. Moreover, based on the transfer matrix method (TMM), combined with the time discreteness and analytical integral method, a discrete time transfer matrix method (DTTMM) for solving the FSI fourteen-equation model in time domain is presented. Then, the numerical solution and experiment of an ARJ21-700 aircraft hydraulic pipe with complex constraints is carried out with four working conditions. The obtained results verify the correctness of the proposed model and solution method, and reveal the universal laws of the FSI response about aircraft hydraulic pipes, which can also provide theoretical and experimental references for modeling, solutions and verification in the FSI analysis of pipe conveying fluid.

Magneto-Optical Spectra of Magnetic Photonic Crystal with Composite (SiO2-Au) Layer

The resonant enhancement of magneto-optical effects due to structure modes arising at the boundary of magnetic photonic crystal [TiO2 / SiO2] m / iron garnet / SiO2 / (SiO2-Au), in which the upper layer (SiO2-Au) is a composite layer of SiO2 with metallic Au nanoscale inclusions, and iron garnet is a bi-layer of composition Bi1.0Lu0.5Gd1.5Fe4.2Al0.8O12 / Bi2.3Dy0.7Fe4.2Ga0.8O12, has been considered by modelling of 4×4 transfer matrix method.

Passive and Active Slab Waveguide Mode Analysis Using Transfer Matrix Method

We present a general approach for numerical mode analysis of the multilayer slab waveguides using the Transfer Matrix Method (TMM) instead of the Finite Difference Frequency Domain (FDFD) method. TMM consists of working through the device one layer at a time and calculating an overall transfer matrix. Using the scattering matrix technique, we develop the proposed method for multilayer structures. We find waveguide modes for both passive and active slabs upon determinant analysis of the scattering matrix of the slab. To do this, we enhance the formulation of spatial scattering matrix to reach spatiotemporal scattering matrix. Our proposed technique is more efficient and faster than other numerical methods. Simulation results show either the spatial modes of inactive and hybrid spacetime modes of active planar waveguide. Also, spacetime wave packets can be seen using plane wave injection into the time-dependent slab waveguide instead of previously reported diffraction-free wave packets which have been obtained using the multifrequency input injection into the un-patterned inactive slab waveguides.

Transmission probability through zigzag monolayer phosphorene superlattice

The transportation of charge carriers for monolayer phosphorene superlattice has been investigated utilizing a transfer matrix method. Also, the efficacy of structural parameters has been studied on the transmission of charge carriers for the system. Our findings demonstrated that the barrier number at the superlattice structures performs an essential role in the transportation probability, that can be utilized in the design of nanoelectronic sets. Further, it can be comprehended that the transmission probability of one for the normal incident has occurred in twenty obstacles. On the other hand, the transmission probability of close to one has occurred in lower landing energies by increasing the obstacle number. As well, it has been understood the transmission probability of close to one by enhancing the barrier number can happen in barriers with a smaller width. According to the results, phosphorene can be used in the novel advances of two dimensional semiconductor devices in electronic applications.