In this paper, a vibration-based damage detection method designed for thin plates is proposed. The method bases on the relation existing between the strain energy stored in the plate in several vibration modes and the respective natural frequencies. For any mode, the strain energy results as sum of the energies stored in all plate elements in that mode. It depends on the square of the mode shape curvature achieved in each element location for the

The different technologies, the multitude of used materials, the different pieces sizes, their complexity, the thermal effect of the processes, the noxes emitted, the energy absorbent character of the process in general etc., all these have an influence upon the work conditions in warm processes, that is why establishing a general graphic of the applicable risks for all foundries would be impossible. Each sector of activity in a warm process has

The SMONTREVIZ project aims to develop a monitoring system, methodologies and tools to gain information regarding the level of noise and vibrations produced by industrial sources, by low costs. The system provides the measured data to companies, local authorities and to the civil society, offering them information which can be used to take measures for mitigation of the pollution factors on one side, or to compare the registered levels with them

Polypropylene or polypropene (PP) is a thermoplastic polymer, made by the chemical industry and used in a wide variety of applications, including food packaging, ropes, textiles, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, polymer banknotes and vehicle components. The authors had tested the behavior of polypropylene used in the fabrication of vehicle components (internal part of doors, instrument panels,

Rubber is often used as a vibration insulator for technical systems. Its behavior is linear until a deformation of at least 15%, by over this limit the behavior becomes non-linear. This means that the dynamic rigidity and implicitly the elasticity module change its value during the element is stressed under dynamic regime. The authors have developed a method to find out this parameters by processing data obtained by measurements with the Wigner-Ville