The article presents the operation and testing of a vibration energy harvesting system with a piezoelectric harvester and wireless sensor data transmission. Conceiving a system that not only includes vibration harvesting on a turbine engine but also a wireless instrumentation node, is a matter of insufficient development maturity within worldwide research area. Within this paper, we proposed and tested, in the lab and on a turbine engine, an architecture for an autonomous instrumentation system, with wireless communication and powered by energy from vibration.

Currently, there is no mathematical model or procedure for designing a pulsejet engine that provides sufficient accuracy to be used in practice. For this reason, the paper addresses the problem by achieving a CFD study of a pulsejet in various configurations, starting from a simpler model (the Schubert model), in order to ensure the simple validation of the results through experimental study. Following the analysis of the results it can be concluded that the proposed method can be an effective tool for the design of pulsejet engines.

Camelina is well-suited to be a biofuel crop, as its seeds naturally have high oil content. At present, the process of obtaining bio-kerosene from camelina oil by hydrotreatment is time consuming and expensive, thus the possibility of using straight camelina oil as fuel in terrestrial applications is taken into consideration. For this purpose, combustion tests have been conducted on a micro gas turbine’s combustion chamber. As fuels have been used a 50% camelina oil / 50% kerosene mixture and 100% camelina oil, both pre-heated at 90°C. The combustion chamber functioned satisfactorily on both fuels. In the future the tests will be resumed for other functioning regimes, varying the air mass flow, the air pressure and fuel mass flow. Also, the design of an injector dedicated to function on camelina oil is taken into consideration.

This paper present a simulation of a crack propagation using the maximum energy release rate criterion and j-integral parameter. The prediction is performed on a gear tooth under a variable load cycle in the elastic and elasto-plastic domains. A comparison based on the maximum tangential stress criterion is also presented. An analysis of the efficiency of the j-integral method in the elastic and elasto-plastic domains is also performed. The effect of the plastic deformation occurring close to the crack tip is considered while expressing the effective stress intensity factor as a function of the j-integral.

It is no longer a “taboo” that people who are exposed to long-term noise may experience annoyance as well as health problems. The European Union has tackled this problem with the introduction of the Directive on Environmental Noise, which obliges Member States to assess and manage noise levels. The Directive is transposed in Romanian legislation and is in force since 2005. But, only drawing up "strategic noise maps" for major roads, railways, airports and agglomerations, using harmonized noise indicators, one cannot assess correctly the number of people annoyed and sleep-disturbed. The paper is presenting the Romanian experience in realizing the first social surveys on aircraft noise annoyance: the implementation of the International Commission on Biological Effects of Noise Procedure, the translation of the two standardized annoyance questions (ISO 15666), the construction of the questionnaire and an overview of a case study performed in vicinity of Iasi Airport. Difficulties, lessons learned and future research will be presented at the end of this paper.