In this paper, the possible realization of the electromagnetic (EM) absorber as a thin metasurface is considered. The metasurface is based on establishing a passive surface of electric and magnetic currents using the Huygen’s principle. So, the absorber is named Huygens Absorber (HA). The metasurface can be designed using split meander lines with spiral rings. In this way, both sides of the sub...

The article presents the results of field tests under-rail pads in order to assess effect stiffness and number standard experimental pads-shock absorbers on amplitude-frequency characteristic vibrations that occur ballast layer rail joint zone when rolling stock is moving. To achieve this goal, we measured vertical vibration accelerations arising during passage trains area with a different shoc...

Micro-perforated absorber is a newly developed sound absorber, and it has a number of attractive features: • Unlike conventional perforated absorbers, micro-perforated absorber can be made from transparent materials like plastic glass. • Unlike commonly used fibrous absorptive materials, micro-perforated absorber is fibrous-free and thus, there is no health concern. • Micro-perforated membranes...

A broadband Circuit Analogue (CA) absorber using double-circular-loop array is investigated in this paper. A simple equivalent circuit model is presented to accurately analyze this CA absorber. The circuit simulation of the proposed model agrees well with full-wave simulations. Optimization based the equivalent circuit model, is applied to design a single-layer circuit analogue absorber using d...

Shock waves in molecular clouds should evolve into continuous or C-type structures due to the magnetic field and ion-neutral friction. We here determine whether and how this is achieved through plane-parallel numerical simulations using an extended version of ZEUS. We first describe and test the adapted code against analytical results, laying the necessary foundations for subsequent works on su...

This work proposes a systematic methodology for designing an active leveling system (ALS) actuator lunar landing application. The ALS is integrated into inverted tripod leg layout, exploiting honeycomb crushable damper as shock absorber. proposed fitted within the leg’s primary strut and features custom permanent-magnet synchronous machine rigidly coupled with lead screw. aims to both provide p...