The paper describes a Wi-Fi equipment hardware configuration intended for testing of a remote communication system with a terminal, which is part of an automation system belonging to a test bench. The experimentation of the Wi-Fi connection is carried out with the test bench working. The communication path crosses the working test bench and many other devices in operating state. In this way, industrial environment conditions are fulfilled. One of the purposes of the paper is to evaluate the parameters considered for the implementation of a system based on Wi-Fi technology, for data remote transmission from the test bench terminal. Setting the parameters for a system based on Wi-Fi technology is useful for the analysis of the behaviour of a Wi-Fi connection within an industrial environment and represents an expected result by providing the continuity and integrity of the transmitted data. The presentation of signal behaviour test results of a type of connection between Wi-Fi devices, in an industrial environment, represents another objective of the paper. Developing a method of evaluation for the behaviour of the Wi-Fi connection in industrial environment through the analysis of the parameters resulted from computation or tests represents an expected outcome. The testing configurations and techniques using specialized software applications are also presented.

HolderPPS system was designed with the purpose of monitoring continuously, dynamically, the mechanical system of rotary blade machines. Conceived as an operational element in the proactive maintenance of RBM, the HolderPPS system enables to perform a continuous and dynamic surveillance of the operational status of all the elements of the mechanical system. Therefore, in the given conditions of the industrial process where the machine is used, the inchoate operation faults can be managed beforehand. The monitoring results of each bladed machine investigated will be stored in a data base, which tends towards building a knowledge base. A history will be thus created by accumulating an information volume, with great usefulness for a periodic analysis of the main causes of RBM faults. Measures can be taken in this moment for avoiding future faults or failures. Such an approach is called proactive, and will be conducted on medium and long term, leading to costs savings regarding machine exploitation.

The paper presents a study on self-healing behaviour of fibre reinforced composite materials integrating dicyclopentadiene filled urea-formaldehyde microcapsules as healing system and Grubb’s catalyst as reaction catalyst. Microstructural analysis showed the formation of microcapsules with diameter ranging from 100 µm to 200 µm. Composite samples were manufactured using prepreg plies and 5%wt. Grubb’s catalyst and 10%wt. microcapsules and subjected to three point bending flexural test (according to SR EN ISO 14125). Samples showed a healing recovery of 87-94% after second loading, after they were left at 35o-40oC for the healing to take effect.

In this paper the CHP 220 screw compressor performance evaluation was performed by using the numerical methods. Thus, for the CFD analysis has defined the computing domain comprised of two subdomains, one rotational and one stationary. The TwinMesh software, dedicated to volumetric machines with positive displacement, was used for the meshing of the rotors. The SST turbulence model has been used for flow modelling. Also, the finite element analysis of the stress and deformation state in the screw compressor rotors was performed. As inputs to FEM analysis, the results of the CFD analysis, performed on the working environment, were used. Finally, the results consist of the variation of the absolute pressure from the inlet to the compressor outlet, the variation of the massflow, the distribution of the sealing fluid (oil), but also the distributions of the stress tensor and the displacements together with the safety coefficients.

The present research was focused on evaluation of multi-wall carbon nanotubes influence on ordinary polymeric composites, starting with integration of the nanotubes, optical microscopic analysis, mechanical testing to determine flexural properties of epoxy nanocomposites and hybrid composites and thermal analysis of hybrid composites. It was observed that changes in the manufacturing process parameters can influence the properties of nanomposites. A reduction in the elasticity of the epoxy matrix was observed after the addition of carbon nanotubes. Also, it was established that even if the nanotubes are functionalized with -COOH group they still present the tendency to form bundles, leading to more rapid failure of the material. The addition of carbon nanotubes between the prepreg plies oriented at 0° leads to a reduction of material’s mechanical properties, while in case of hybrid composites with prepreg plies oriented at 45° an increase of material’s mechanical properties was observed. Regarding the thermal analysis, a slight modification of the hybrid material’s Tg was observed (an increase of 1%).

National Research & Development Institute for Gas Turbines Comoti has developed a helical screw expander - asynchronous electric generator assembly – as well as a test system for tracking the parameters of thermal, mechanical and electrical processes during common or transitory working regimes, their adjustment and control in order to ensure maximum security working conditions. The element of novelty of this electric energy providing assembly constitutes the use of a helical turbine that works at lower speed than other classical expanders due to the elimination of the reductor which ensures the connection of the expander to the electric generator. The monitoring system introduces functional check-ups of the manual and electrical operated elements as well as the check-up of measuring lines of the analog parameters. The testing was done in the testing bench at COMOTI premises and it used air as a working agent. The results thus obtained constitute the preliminary data that may offer the possibility of placing the screw expander - electric generator assembly inside regulating and measurement stations.

The experimental identification of mechanical system of aircraft engine is achieved through a detailed research of the engine vibration behavior. The instrumentation and signal processing technologies existing today determine more precisely the required parameters for the calculation of engine lifetime than theoretical calculations. These parameters have a big impact on the operational safety and the maintenance process of aircraft. The experimental vibration analysis area is extensive and involves several other fields: vibration measurement, signal processing, mathematics and statistics, problems on systems vibration with several degrees of freedom, different damping models, etc. This work focuses on finding and applying reliable methods for the experimental identification of mechanical structures of aircraft gas turbine engine. The first step on the identification process is the definition of the type of experiments to be done (or experimental model). The purpose of the experimental model must to be clearly defined at the beginning because it affects the experimental conditions. The experimental identification of the dynamic behavior consists on finding of the transfer function, also called frequency response function (FRF), which best describes the mechanical components of the engine analyzed.