The aerospace industry is one of the biggest consumers of advanced materials because of its unique combination of mechanical and physical properties and chemical stability. Highly alloyed stainless steel, titanium alloys and nickel based superalloys are mostly used for aerospace applications. High alloyed stainless steel is used for the shafts of aero engine turbines, titanium alloys for compre...

For many constraint satisfaction problems, there are well known, fast algorithms and functions that solve parts of the problem. Using these methods directly to solve the sub-problems signiicantly speeds up the solving process. Unfortunately, doing this has usually required the solver to be changed, or the correctness criteria to be reexamined. We describe a general mechanism to use procedures w...

The automatic detection of the vibration signature of rotating parts of an aircraft engine is considered. This paper introduces an algorithm that takes into account the variation over time of the level of detection of orders, i.e. vibrations ate multiples of the rotating speed. The detection level over time at a specific order are gathered in a socalled trajectory. It is shown that clustering t...

We describe the architecture and some aspects of System R/X, a native XML database engine that is built on the same mature infrastructure for a relational database and integrated with the relational engine. We describe what parts of the infrastructure can be reused, what need to be extended, and what are totally new to the XML database and their techniques. Our overall strategy is to base XML s...

In this paper, the strength analysis and fatigue life calculation of multi-component coupling crankshaft, connecting rod engine body highly strengthened single cylinder diesel are carried out. The stress in two working cycles is calculated by transient dynamics, analyzed based on third theory firstly; Then, accuracy results verified experiment crankshaft reduced scale model static body; Finally...

The article considers application areas of various machining methods for perforating holes in parts with unpredictable surface fluctuations. most effective obtaining a high-frequency ion engine are shown. Studies perforation technologies using have been carried out. Qualitative relations between the geometric dimensions spherical billet perforated mechanical method, and quality product layer co...

This paper describes a distributed Query Engine for executing queries on XML documents. It supports complex pattern matching and a single pattern can be used for not only expressing selections and projection but also for a joins of one part of the document with another parts of the same document. The patterns can contain path expressions and tag variables as well. It is a multithreaded pipeline...

"The usual way that such engines are designed (for military or civilian aircraft) may be called the component system, or bottom-up design. First it is necessary to thoroughly understand the properties and limitations of the materials to be used (for turbine blades, for example), and tests are begun in experimental rigs to determine those. With this knowledge larger component parts (such as bear...