Claudia Borda

Procedures for Measuring and Modelling Underwater Acoustic Field Parameters

Considering the pollution acoustics increasingly acute underwater environment, it raises the need for an evaluation, structuring and mapping of underwater noise. It requires a harmonized methodological framework for data collection, field simulation of evolution acoustic characteristics for the modeling and plotting maps of underwater noise. This paper comes to make a contribution on procedures for measuring the characteristics of underwater acoustic field, by developing procedures for measuring and modeling the transmission loss and sound profile. Two scenarios are also presented for the production of underwater noise, that can be used for drawing maps of noise.

Mobile Equipment for Hydro-Acoustic Parameters Measurement

During construction and during exploitation operations of the offshore objectives occurs, inevitably, noise pollution in the marine environment. This paper presents a system for measuring underwater acoustic field. The mobile polygon is described, which is used in noise measurements for the determination of sea noise.

Experimental Research on Quality Assessment of Ultrasonic Cleaning Process

This article presents the way to determine the cleaning degree of the parts made of microelectronic parts. The cleaning degree of parts depends on: temperature of the cleaning medium, the cleaning liquid nature, cleaning liquid viscosity, time of cleaning. Primarily the choice of the cleaning mediums depends on the type of contaminant that needs to be removed from the cleansed object, respectively on the chemical that can attack these contaminants. The cleaning degree can be determined using two parallel methods, respectively: the method of mass loss and the method of microscopy. The method of weighting justifies the cleaning by mass loss, while the method of microscopy allows clear visualization and removal of any contaminants

Experimental Research and Modeling of the Underwater Sound in Marine Environment

The paper presents a modeling of the acoustic field emitted by a rig tender located offshore exploration in the Black Sea. Are presented measuring system, experimental context, the types of noise that participate in the overall noise budget and the conditions in which measurements were made, also are mentioned and the project established through were measured the parameters and were defined devices which these measurements were made. Measurement system used is adaptable, allowing dynamic measurements and operative analysis of the acquired data. Measurement methodology was determined by an acoustic project, which was set to be purchased both: sizes and ways of interpreting them. Modeling acoustic field shows that the maximum acoustic impact area, below 120 dB re 1μPa criterion (proposed and accepted by Marine Directive) was extended to 3-5Km distance around the ship. It is expected to produce adverse effects on the marine habitat and on the underwater life.