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Piezoelectric materials have a capability to absorb energy from surroundings and transform it into electrical energy. Energy harvesting is an absolute task in the aerospace industry to drive wireless sensors. In this paper, multi-state reliability risk assessment based on importance measures for aeroelastic piezoelectric energy harvesters (APEH) is carried out. The risk assessment evaluates the system based on its different states of operation and enables a reliability risk analyst to access dynamically the risk associated with the components of the system. A multi-state importance measures based APEH risk assessment system is not just capable of evaluating the risk at system, subsystem and component level but also takes into account the relative states of the system, subsystem and components. The proposed risk assessment gives a relative importance factor to each input thus identifying the most important subsystem for the system and most important component to the subsystem. Such risk results can be very useful for the maintenance engineers and risk analyst of the aerospace industry so that the respective maintenance actions can be made more targeted and proactively anticipated. The results indicate the proposed methodology to be highly effective and efficient. [ABSTRACT FROM AUTHOR]

From the last few decades, the piezoelectric materials are playing a vital role in the field of aerospace engineering. One of the major factors to reduce an aircraft's malfunctioning is its health monitoring. In doing so multiple types of sensors are required to be designed specifically for an aircraft. A large amount of energy source is required for operating all those sensor therefore harvesting techniques are made. This paper discusses the use of piezoelectric materials in health monitoring, aircraft's sensors and energy harvesters. It gives an elaborated idea of how piezoelectric materials can be used in various stages at aerospace industries. [ABSTRACT FROM AUTHOR]

Nano-Cu-based materials have many applications in the microelectronics and aerospace industries, which not only maintain the advantages of copper materials, but also make up for the shortage of copper. In this paper, the precursor powder of silica-reinforced copper matrix composites was prepared by chemical coprecipitation method, which main ingredients are Cu4SO4(OH)6 and SiO2. The precursor powder was reduced by hydrogen in 450 °C for 4 h to obtain SiO2-Cu composite powder, and then treated by cold press pressing and solid phase high temperature sintering to obtain nano-silica copper matrix composite. The results show that that the reinforcing phase and matrix are mutually dispersed in the process of coprecipitation, and the composite gains more homogeneous size and higher hardness as the dispersion effect of reinforcement on the copper matrix achieves the best. [ABSTRACT FROM AUTHOR]

Nano-copper-based materials are wildly applied in the microelectronics and aerospace industries, which not only maintain the advantages of copper materials, but also make up for the shortage of copper. ZnO in ZnO-Copper composite prepared by chemical coprecipitation was evenly distributed in the copper matrix in the form of hexagonal nanosheets. The maximum hardness of the composite can reach a maximum of 119.44Hv, and the minimum wear rate is only 0.6% of pure copper; meanwhile, the density and the conductivity both decrease slightly. The relative density of composite with ZnO content of 4% and 8.% exceeds 96%. The rates exceeds 70% IACS. However, The results suggest that the introduction of ZnO reduces the corrosion resistance of the copper matrix, and the corrosion weight loss of 20 wt.% ZnO is nearly 3 times that of pure copper. [ABSTRACT FROM AUTHOR]