The output data from a structure is the building block for output-only modal analysis. The structure response in the output data, however, is usually contaminated with noise. Naturally, the success of output-only methods in determining the modal parameters of a structure depends on noise level. In this paper, the possibility and accuracy of identifying the modal parameters of a simply supported...

Building mounted micro wind turbines (BMWTs) could potentially provide a useful contribution to renewable energy production but a means of predicting structure-borne sound and vibration is required. A particular difficulty is that BMWTs can only be operated when properly installed, therefore any source characterization measurements must be conducted in situ. Methods such as inverse force synthe...

Outside of the Galactic plane there are two major sources of confusion that limit the sensitivity of con tinuum observations at submillimeter wavelengths the spatial structure of the thermal emission from dust in the Milky Way and the crowding of extra galactic sources at faint levels We present estimates of the noise expected from these two types of con fusion as a function of wavelength and b...

the mixture of natural and artificial seismic sources with random distributions cause diffuse wave field with random amplitudes and phases called noise. when noise is analyzed in a long-term process, it contains surface waves which are spread in all directions. thus, ambient noise contains data relevant to the surface waves. in recent years, as broadband seismic networks have been distributed v...

Abstract Fluid-borne noise (FBN) is a major contributor to structure-borne (SBN) and air-borne (ABN) in hydraulic fluid power systems could lead increased fatigue system components. FBN caused by the unsteady flow generated pumps motors propagates through resulting SBN ABN. New technologies such as digital switched converters also generate unavoidable FBN. This article reports on novel integrat...

The noise levels in the passenger cabin of turbopropeller-driven aircraft are typically higher than the noise levels in comparable turbofan-powered aircraft. The sources of noise in a turboprop aircraft include boundary layer flow noise, structure-borne noise due to engine vibration, and acoustic excitation of the fuselage due to the propeller, with the latter being dominant for most turboprop ...

The construction of new buildings very close to existing tracks, with heavy commuting traffic, requires careful design. Such projects must be accompanied noise and vibration reduction measures. practical case here considered has been analysed by first assessing the situation prior (type soil traffic). In a second stage, we have proposed quantified solutions reduce ground-borne levels inside bui...

A novel low noise trans-impedance amplifier is proposed using low cost 0.18 µm CMOS technology. A resistive-capacitive feedback is used to extend the bandwidth of the amplifier. As the structure is inductor less, it is suitable for low cost integrated optical interconnects. In this paper Improved Particle Swarm Optimization have applied to determine optimal trans-resistance and noise of propose...