REMOVING ADDITIVE NOISE IN MEASUREMENTS OF LOW SOUND PRESSURE LEVELS

  • 1Centre for Advanced Innovation Technologies, VSB-Technical University of Ostrava, Ostrava, CZ
  • 2Department of Hydromechanics and Hydraulic Equipment, Faculty of Mechanical Engineering, VSB-Technical University of Ostrava, Ostrava, CZ

Abstract

Noise belongs among the negative phenomena in our environment and can have a negative effect on human health. Excessive noise occurs in many areas, e.g. in transport, aeronautics, and during manufacturing processes. It is often necessary to meet specified noise limits. Acoustic measurements are carried out in many cases, e.g. in order to evaluate the sound absorption properties of investigated materials and acoustic conditions in a given environment. Measurements of extremely low sound pressure levels can be used to describe the acoustic environment in an acoustic laboratory or to measure noise emissions from quiet machines and equipment. Furthermore, measurements of extremely low noise levels are limited by the thermal noise of the measurement chain. If the sound pressure levels are lower than the thermal noise of the measurement chain, then the measurement is not correct. This paper describes the measurement of extremely low sound pressure levels using an improved correlation function method.

Recommended articles

MODEL OF CYCLICAL MONITORING AND MANAGING OF LARGE-SCALE FIRES AND EMERGENCIES FOR EVALUATION OF THE REQUIRED NUMBER OF UNMANNED AIRCRAFT SYSTEMS

Denis V. Tarakanov, Vanessa Prajova, Maksim O. Bakanov, Aleksandr V. Kuznetsov, Ksenia L. Domnina
Keywords: monitoring planning | information support | reserving the monitoring tools

INNOVATION AND RECYCLING OF ALUMINIUM CASTINGS IN THE FORM OF PLASTIC REPAIR METAL ADDITION FOLLOWED BY MACHINING

Anton Panda, Lukas Androvic, Iveta Pandova
Keywords: Aluminium | process | material | waste | procedure | material loss | damage

BLADE LOAD ANALYSIS ON SWIRL TURBINE RUNNER WITH NONUNIFORM BLADE CASCADE

Jakub Starecek, Miloslav Haluza, Pavel Rudolf
Keywords: swirl turbine | nonuniform blade cascade | cfd | FEM

NUMERICAL ANALYSIS OF THE FLOW CONDITIONS IN THE AIR DISTRIBUTION ELEMENT

Maria Carnogurska, Miroslav Prihoda, Daniela Popcakova
Keywords: air distribution element | velocity conditions | numerical analysis | computational fluid dynamics | turbulence models