Comparative Analysis of Visco-elastic Models with Variable Parameters

The paper presents a theoretical comparative study for computational behaviour analysis of vibration isolation elements based on viscous and elastic models with variable parameters. The changing of elastic and viscous parameters can be produced by natural timed evolution demo-tion or by heating developed into the elements during their working cycle. It was supposed both linear and non-linear numerical viscous and elastic models, and their combinations. The results show the impor-tance of numerical model tuning with the real behaviour, as such the characteristics linearity, and the essential parameters for damping and rigidity. Multiple comparisons between linear and non-linear simulation cases dignify the basis of numerical model optimization regarding mathematical complexity vs. results reliability

Regarding the Use of Finite Element Modeling for Propulsion System Sizing in V.T.O.L. Drones

At the moment, VTOL drones have proven their efficiency in several areas, for this reason, they have become indispensable tools for a large category of applications. This paper presents aspects related to the dimensioning stage of the propulsion system of a drone based on finite element modeling, to establish the traction force necessary to ensure sustentation

Urban Pollution Issues Generated by Trams Traffic

The modern society development involves new and diverse issues considering urban environmental pollution. Traffic generated sound and vibration are two upto-date urban environmental pollution causes besides air and water pollution ones. Public transportation in metropolitan areas is a major and constant all levels environmental pollution cause. Electric engines as an alternative to internal combustion ones could reduce the air pollution caused by urban public transportation. The tram network is an important element of this approach even if a poor condition of tram network elements could be a major cause of sound and vibration environmental pollution. This research paper is a study of a particular case considering the vibration level transmitted to a building close to tram network in the town of Braila City

Aspects Regarding the Impact of Energy Recovery from Domestic Waste on Atmosphere

The issue of domestic waste neutralization appeared with human civilization but got new dimensions in the context of the present consumer society. The diversity and increasing quantity of domestic waste imposed finding new methods for its neutralization, grouped into two categories, namely recycling and recovery. In the category of domestic waste recovery methods, incineration is mentioned among others. The main drawback of the incineration process is air pollution, which is present when the implementation of gaseous pollutant retention solutions at the source generation is avoided. In order to identify the areas that are potential sources of pollution, the present paper focuses on the dispersion modelling of gaseous pollutants from domestic waste incineration

Study on the Sludge Capitalization as a Fertilizer for Ornamental Garden Plants

The paper aimed to demonstrate that the sludge from wastewater treatment plants can be used efficiently as a fertilizer in horticulture because in the near future the storage of this sludge will become a problem. For this reason, we approached the study on the recovery of the sludge from the wastewater treatment plant of Brăila as fertilizer in the crops of ornamental garden plants that are not intended for consumption. The correct management of the sludge from wastewater treatment plants may bring a positive contribution to the vegetation development rate. The main objective of the sludge treatment is the capitalization and the decrease of negative impact on the environment

Experimental Investigation of Dynamic Behavior of Viaducts by Shock Loading

The viaducts are constructions designed to provide ground communication over different geographical barriers such as examples valleys (depressions). To avoid partial or total destruction that may occur after dynamic stress from road (or railroad) or seismic activity, in viaducts structure is placed systems for dynamic isolation. Thus, the viaduct deck is mounted on viscoelastic type systems designed to provide protection from the shock loading. Over time, due to an intensive and varied of dynamic loadings, these isolation systems suffer degradation of viscoelastic links, something that leads to uncontrolled movements of the system. In this work, are established and quantified on experimental way, kinematics parameters of the vibration of the viaduct deck loading by shocks, which will be monitored over time to establish the degree of normality in the functioning of viscoelastic systems