Theoretical basis, concept and methodology of control and correction of turbojet engines thrust asymmetry

Abstract

The issues related to the study of the additional possibility of tightening the control of mutual conformity of the quality of turbojet engines in the conditions of their serial production and subsequent operation in the power plants of medium-haul aircraft and long-haul aircraft are considered. The purpose of the study is to develop new principles and corresponding digital methods for monitoring and correcting the thrust asymmetry of serial turbojet engines to improve the flight safety of medium-haul aircrafts and long-haul aircrafts with such engines. Methods of mathematical statistics and software modeling were used in the study. The results of the development of the concept and methodology of control and minimization of the thrust asymmetry of turbojet engines of one series in such conditions are presented.

Airfoil smoothing using unconditional optimization taking into account aerodynamic criteria

“…The results of the smoothing performed confirm the correctness of the choice of the objective function and the effectiveness of the developed smoothing technique for the tasks of ensuring a smooth change in the curvature of the airfoil. However, the technique needs to be refined to prevent the appearance of unforeseen inflections in the curve [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37].…”

Investigation of mechanical properties of composite materials reinforced with carbon fibers

“…For this purpose, we consider the calculation with given effective volume content (volume content of the filler + volume content of the interfacial layer, assuming their properties are equal). Let's choose the effective volume content which allows to describe the experimental data received in relation to the modulus and ultimate strength [37][38][39][40][41][42][43][44][45][46][47][48].…”

Application of the spherical indenter for determination of the elastic modulus of coatings

“…For example, previously the elastic properties of grains in silicon carbide ceramics were measured and a Young modulus value close (within the measurement error) to the theoretically known value of the Young modulus of SiC crystals was obtained. In this work a pliable polymer coating is investigated [36][37][38][39][40][41][42][43][44][45][46]. It is likely that the elastic properties of this coating from indentation tests are quite difficult to estimate, due to the non-linearity of the defining relationships that are characteristic of this type of material.…”