http://arthra.ugal.ro/handle/20.500.14043/24554 2026-04-09T09:31:47Z http://arthra.ugal.ro/handle/20.500.14043/24571 About Phonic Isolation of the Mobile Equipment Cabin Anghelache, Diana This work presents vibration absorbing and damping solutions for operator cabin on construction equipment. Hereby, the operator cabin has to be considered accordingly. Vibration proof and sound proof materials applied on the cabin walls require known attenuation and absorbing coefficients according to frequency. Exceeding the compartment noise level above the established limits involves special noise reducing measures. All the mat surfaces that have horizontal, vertical or diagonal alignment can be insulated according to a certain geometric configuration of an operator cabin. The work related noise is a major concern in Europe. It affects millions of workers not only in heavy industry but in various fields of activity such as services, education and entertainment. One third of the European employees are exposed to high noise levels during more than one third of their work time. Approximately 40 million workers (the equivalent of population of Spain) have to raise their voices over the normal level in order to communicate properly. That happens during half of the work time, at least. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV MECHANICAL ENGINEERING, ISSN 1224 - 5615 2008-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24570 Determination of Epoxy Resin' Mechanical Properties by Experimental-Computational Procedures in Tension Tsiafis, I.; Bouzakis, K.-D.; Michalidis, N. The use of epoxy resins in metal structures for adhesive reasons is getting wider. Epoxy resins possess enhanced mechanical, chemical and physical properties, i.e. increased shear and compression strength, resistance in solvents, as well as at high temperatures. Tensile tests were carried out with standard aluminium tension specimens glued with epoxy resins. The thickness of the glue and the acting crosssection area were variable. The specimens were cemented under constant temperature and humidity conditions. The experimental results were simulated with the aid of FEM-based procedures, while the stress–strain curves of the epoxy resins, as obtained by nanoindentations and corresponding FEM-supported algorithm, were taken into account. The obtained results allow the determination of the epoxy resins’ strength versus its thickness and the occupying cross-section area. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV MECHANICAL ENGINEERING, ISSN 1224 - 5615 2008-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24569 On the Rheological Behaviour of the soil in the Artificial Compacting Process Oproescu, Gheorghe; Debeleac, Carmen; Leopa, Adrian; Năstac, Silviu-Marian The artificial compacting of the soil is made mostly with machines with dynamical action such as vibrating plate, vibrating beater or vibrating drum. Their effect on the compacting process of the soil has two origins: the own weight of the machine and the unidirectional vibrating force generated from a specific device. A centrifugal vibrating generator is the frequently used device. In order to develop equipments with high performance, namely computer-aided machines, machines with active adaptation or alike, the physical and mathematical modeling of the soil behaviours are necessary. The previously developed models, based on the linear elastical behaviour of the soil and certain tricks used in the presentment of the soil properties in order to make easy an analytical solution of the movement equations, try to adapt a linear model to a nonlinear and nonelastical medium. This fact brings about very large approximations of the reality.Our work shows a new model of the soil, based on more properties such as elasticity, viscosity, plasticity and dry friction. This model is excited by a vibrating machine and the result concerning displacement, speed, acceleration or consumed power is possible to be obtained on computer. The modification of the properties of the compacted soil modifies the result of the model and therefore the compaction degree can be modeled by modifying the result of the developed model The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV MECHANICAL ENGINEERING, ISSN 1224 - 5615 2008-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24568 A Method of Assessing the Stress in some Components of Hydraulic Cylinders Hauk, Niculai This paper proposes a method for evaluating the stress of the unit body of the hydraulic cylinder and the rod which was at work and the Hydraulic Brake at the end of the race. The paper analyzes the situation in which is acting hydraulic cylinder with a rigid axle set, being powered by a hydraulic installation whose source is a flow pump controlled by power regulator. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV MECHANICAL ENGINEERING, ISSN 1224 - 5615 2008-01-01T00:00:00Z