Methodological Foundations Protective Structures Development for Shielding Electromagnetic and Acoustic Fields

In many cases the simultaneous protection against electromagnetic and acoustic fields of wide frequency ranges is required. The complexity such a task lies in impossibility significantly reducing low-frequency sound levels with traditional sound-absorbing materials, as well different requirements for materials that shield high-frequency fields. It proposed to solve this problem by creating two-layer structure, front surface which solid, inner perforated. panel can be made non-conductive material. variant Bekeshi mainly intended reduce level certain high amplitude. perforation internal (metal) chosen based on need provide shielding frequencies or bands. A calculator provided calculating required parameters (linear dimensions, thickness, hole diameters, their number per unit area). advisable fill space between panels material, example, granulated polystyrene. provides absorption medium makes design broadband. use ferromagnetic material magnetic component ultra-low field (mainly industrial). calculated waveguide theory waves. results tests effectiveness facing metal-polymer form tiles are presented. performance satisfactory most industrial domestic conditions. Determination mechanical properties (Young's modulus, shear modulus Poisson's ratio) showed it not inferior known even large content substance. order rationalize priority factor (frequency band) selected basis live measurements spectra. shown calculations have volumes, solution two-factor optimization problems always possible. Appropriate creation application software simplify process designing protective structures rationalizing principles reasonable sufficiency.