Abstract A helicopter landing and taking off on an elevated helipad is a source of noise that affects the environment causes vibrations pad or building infrastructure. Vibrations are also excited by air stream flowing through main rotor transferred to contact chassis. structure helipad. Depending damping properties vibro-isolating elements used, can be felt in rooms used people transmitted devi...

In this work, an energy-based automatic sub-structuring method is proposed. The established energy formulation is applicable in the lowand medium-frequency ranges when using a stochastic vibroacoustic model. The idea evolved from recent work which aimed to take into account system parameters and model uncertainties in vibroacoustic modeling by applying a probabilistic approach of uncertainties....

The paper presents an application of an on-board recording system for critical situation detection in railroad transportation. The evaluation of the state of a rail vehicle is based on the signals recorded with the use of ORD (On-Board Recording Devices) devices. The main subject of interest are critical situations that can occur when the rail vehicle is in motion. The critical situation is any...

A fiber Bragg grating (FBG) vibroacoustic sensor exploiting an intensity-based interrogation principle is presented. The optical system is complemented by signal processing techniques that allow disturbances to be mitigated and improve the spectral estimation. The sensor is capable of performing frequency analysis of sounds up to 3 kHz, with top sensitivity in the 100-500 Hz frequency range, an...